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Code re-work: advanced lighting.

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This commit is contained in:
Joey de Vries
2017-04-22 17:07:31 +02:00
parent 91dc770bc5
commit cdcc3be029
85 changed files with 3234 additions and 178 deletions
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14
CMakeLists.txt
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@@ -132,14 +132,18 @@ set(4.advanced_opengl
set(5.advanced_lighting
1.advanced_lighting
2.gamma_correction
3.1.shadow_mapping
3.2.point_shadows
# 3.3.csm
3.1.1.shadow_mapping_depth
3.1.2.shadow_mapping_base
3.1.3.shadow_mapping
3.2.1.point_shadows
3.2.2.point_shadows_soft
4.normal_mapping
5.parallax_mapping
5.1.parallax_mapping
5.2.parallax_occlusion_mapping
6.hdr
7.bloom
8.deferred_shading
8.1.deferred_shading
8.2.deferred_shading_volumes
9.ssao
)

8
src/5.advanced_lighting/1.advanced_lighting/advanced_lighting.frag → src/5.advanced_lighting/1.advanced_lighting/1.advanced_lighting.fs
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@@ -15,14 +15,14 @@ uniform bool blinn;
void main()
{
vec3 color = texture(floorTexture, fs_in.TexCoords).rgb;
// Ambient
// ambient
vec3 ambient = 0.05 * color;
// Diffuse
// diffuse
vec3 lightDir = normalize(lightPos - fs_in.FragPos);
vec3 normal = normalize(fs_in.Normal);
float diff = max(dot(lightDir, normal), 0.0);
vec3 diffuse = diff * color;
// Specular
// specular
vec3 viewDir = normalize(viewPos - fs_in.FragPos);
vec3 reflectDir = reflect(-lightDir, normal);
float spec = 0.0;
@@ -37,5 +37,5 @@ void main()
spec = pow(max(dot(viewDir, reflectDir), 0.0), 8.0);
}
vec3 specular = vec3(0.3) * spec; // assuming bright white light color
FragColor = vec4(ambient + diffuse + specular, 1.0f);
FragColor = vec4(ambient + diffuse + specular, 1.0);
}

22
src/5.advanced_lighting/1.advanced_lighting/1.advanced_lighting.vs Normal file
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@@ -0,0 +1,22 @@
#version 330 core
layout (location = 0) in vec3 aPos;
layout (location = 1) in vec3 aNormal;
layout (location = 2) in vec2 aTexCoords;
// Declare an interface block; see 'Advanced GLSL' for what these are.
out VS_OUT {
vec3 FragPos;
vec3 Normal;
vec2 TexCoords;
} vs_out;
uniform mat4 projection;
uniform mat4 view;
void main()
{
vs_out.FragPos = aPos;
vs_out.Normal = aNormal;
vs_out.TexCoords = aTexCoords;
gl_Position = projection * view * vec4(aPos, 1.0);
}

321
src/5.advanced_lighting/1.advanced_lighting/advanced_lighting.cpp
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@@ -1,237 +1,276 @@
// GLEW
#define GLEW_STATIC
#include <GL/glew.h>
// GLFW
#include <glad/glad.h>
#include <GLFW/glfw3.h>
#include <stb_image.h>
// GL includes
#include <learnopengl/shader.h>
#include <learnopengl/camera.h>
// GLM Mathemtics
#include <glm/glm.hpp>
#include <glm/gtc/matrix_transform.hpp>
#include <glm/gtc/type_ptr.hpp>
// Other Libs
#include <SOIL.h>
#include <learnopengl/filesystem.h>
#include <learnopengl/shader_m.h>
#include <learnopengl/camera.h>
#include <learnopengl/model.h>
// Properties
const GLuint SCR_WIDTH = 800, SCR_HEIGHT = 600;
#include <iostream>
// Function prototypes
void key_callback(GLFWwindow* window, int key, int scancode, int action, int mode);
void scroll_callback(GLFWwindow* window, double xoffset, double yoffset);
void framebuffer_size_callback(GLFWwindow* window, int width, int height);
void mouse_callback(GLFWwindow* window, double xpos, double ypos);
void Do_Movement();
GLuint loadTexture(GLchar const * path);
void scroll_callback(GLFWwindow* window, double xoffset, double yoffset);
void processInput(GLFWwindow *window);
unsigned int loadTexture(const char *path);
// Camera
// settings
const unsigned int SCR_WIDTH = 1280;
const unsigned int SCR_HEIGHT = 720;
bool blinn = false;
bool blinnKeyPressed = false;
// camera
Camera camera(glm::vec3(0.0f, 0.0f, 3.0f));
float lastX = (float)SCR_WIDTH / 2.0;
float lastY = (float)SCR_HEIGHT / 2.0;
bool firstMouse = true;
// Delta
GLfloat deltaTime = 0.0f;
GLfloat lastFrame = 0.0f;
// timing
float deltaTime = 0.0f;
float lastFrame = 0.0f;
// Options
GLboolean blinn = false;
// The MAIN function, from here we start our application and run our Game loop
int main()
{
// Init GLFW
// glfw: initialize and configure
// ------------------------------
glfwInit();
glfwWindowHint(GLFW_CONTEXT_VERSION_MAJOR, 3);
glfwWindowHint(GLFW_CONTEXT_VERSION_MINOR, 3);
glfwWindowHint(GLFW_OPENGL_PROFILE, GLFW_OPENGL_CORE_PROFILE);
glfwWindowHint(GLFW_RESIZABLE, GL_FALSE);
GLFWwindow* window = glfwCreateWindow(SCR_WIDTH, SCR_HEIGHT, "LearnOpenGL", nullptr, nullptr); // Windowed
// glfw window creation
// --------------------
GLFWwindow* window = glfwCreateWindow(SCR_WIDTH, SCR_HEIGHT, "LearnOpenGL", NULL, NULL);
glfwMakeContextCurrent(window);
// Set the required callback functions
glfwSetKeyCallback(window, key_callback);
if (window == NULL)
{
std::cout << "Failed to create GLFW window" << std::endl;
glfwTerminate();
return -1;
}
glfwSetFramebufferSizeCallback(window, framebuffer_size_callback);
glfwSetCursorPosCallback(window, mouse_callback);
glfwSetScrollCallback(window, scroll_callback);
// Options
// tell GLFW to capture our mouse
glfwSetInputMode(window, GLFW_CURSOR, GLFW_CURSOR_DISABLED);
// Initialize GLEW to setup the OpenGL Function pointers
glewExperimental = GL_TRUE;
glewInit();
// glad: load all OpenGL function pointers
// ---------------------------------------
if (!gladLoadGLLoader((GLADloadproc)glfwGetProcAddress))
{
std::cout << "Failed to initialize GLAD" << std::endl;
return -1;
}
// Define the viewport dimensions
glViewport(0, 0, SCR_WIDTH, SCR_HEIGHT);
// Setup some OpenGL options
// configure global opengl state
// -----------------------------
glEnable(GL_DEPTH_TEST);
glEnable(GL_BLEND);
glBlendFunc(GL_SRC_ALPHA, GL_ONE_MINUS_SRC_ALPHA);
// Setup and compile our shaders
Shader shader("advanced_lighting.vs", "advanced_lighting.frag");
// build and compile shaders
// -------------------------
Shader shader("1.advanced_lighting.vs", "1.advanced_lighting.fs");
GLfloat planeVertices[] = {
// Positions // Normals // Texture Coords
8.0f, -0.5f, 8.0f, 0.0f, 1.0f, 0.0f, 5.0f, 0.0f,
-8.0f, -0.5f, 8.0f, 0.0f, 1.0f, 0.0f, 0.0f, 0.0f,
-8.0f, -0.5f, -8.0f, 0.0f, 1.0f, 0.0f, 0.0f, 5.0f,
// set up vertex data (and buffer(s)) and configure vertex attributes
// ------------------------------------------------------------------
float planeVertices[] = {
// positions // normals // texcoords
10.0f, -0.5f, 10.0f, 0.0f, 1.0f, 0.0f, 10.0f, 0.0f,
-10.0f, -0.5f, 10.0f, 0.0f, 1.0f, 0.0f, 0.0f, 0.0f,
-10.0f, -0.5f, -10.0f, 0.0f, 1.0f, 0.0f, 0.0f, 10.0f,
8.0f, -0.5f, 8.0f, 0.0f, 1.0f, 0.0f, 5.0f, 0.0f,
-8.0f, -0.5f, -8.0f, 0.0f, 1.0f, 0.0f, 0.0f, 5.0f,
8.0f, -0.5f, -8.0f, 0.0f, 1.0f, 0.0f, 5.0f, 5.0f
10.0f, -0.5f, 10.0f, 0.0f, 1.0f, 0.0f, 10.0f, 0.0f,
-10.0f, -0.5f, -10.0f, 0.0f, 1.0f, 0.0f, 0.0f, 10.0f,
10.0f, -0.5f, -10.0f, 0.0f, 1.0f, 0.0f, 10.0f, 10.0f
};
// Setup plane VAO
GLuint planeVAO, planeVBO;
// plane VAO
unsigned int planeVAO, planeVBO;
glGenVertexArrays(1, &planeVAO);
glGenBuffers(1, &planeVBO);
glBindVertexArray(planeVAO);
glBindBuffer(GL_ARRAY_BUFFER, planeVBO);
glBufferData(GL_ARRAY_BUFFER, sizeof(planeVertices), &planeVertices, GL_STATIC_DRAW);
glBufferData(GL_ARRAY_BUFFER, sizeof(planeVertices), planeVertices, GL_STATIC_DRAW);
glEnableVertexAttribArray(0);
glVertexAttribPointer(0, 3, GL_FLOAT, GL_FALSE, 8 * sizeof(GLfloat), (GLvoid*)0);
glVertexAttribPointer(0, 3, GL_FLOAT, GL_FALSE, 8 * sizeof(float), (void*)0);
glEnableVertexAttribArray(1);
glVertexAttribPointer(1, 3, GL_FLOAT, GL_FALSE, 8 * sizeof(GLfloat), (GLvoid*)(3 * sizeof(GLfloat)));
glVertexAttribPointer(1, 3, GL_FLOAT, GL_FALSE, 8 * sizeof(float), (void*)(3 * sizeof(float)));
glEnableVertexAttribArray(2);
glVertexAttribPointer(2, 2, GL_FLOAT, GL_FALSE, 8 * sizeof(GLfloat), (GLvoid*)(6 * sizeof(GLfloat)));
glVertexAttribPointer(2, 2, GL_FLOAT, GL_FALSE, 8 * sizeof(float), (void*)(6 * sizeof(float)));
glBindVertexArray(0);
// Light source
// load textures
// -------------
unsigned int floorTexture = loadTexture(FileSystem::getPath("resources/textures/wood.png").c_str());
// shader configuration
// --------------------
shader.use();
shader.setInt("texture1", 0);
// lighting info
// -------------
glm::vec3 lightPos(0.0f, 0.0f, 0.0f);
// Load textures
GLuint floorTexture = loadTexture(FileSystem::getPath("resources/textures/wood.png").c_str());
// Game loop
while(!glfwWindowShouldClose(window))
// render loop
// -----------
while (!glfwWindowShouldClose(window))
{
// Set frame time
GLfloat currentFrame = glfwGetTime();
// per-frame time logic
// --------------------
float currentFrame = glfwGetTime();
deltaTime = currentFrame - lastFrame;
lastFrame = currentFrame;
// Check and call events
glfwPollEvents();
Do_Movement();
// input
// -----
processInput(window);
// Clear the colorbuffer
// render
// ------
glClearColor(0.1f, 0.1f, 0.1f, 1.0f);
glClear(GL_COLOR_BUFFER_BIT | GL_DEPTH_BUFFER_BIT);
// Draw objects
shader.Use();
glm::mat4 view = camera.GetViewMatrix();
// draw objects
shader.use();
glm::mat4 projection = glm::perspective(camera.Zoom, (float)SCR_WIDTH / (float)SCR_HEIGHT, 0.1f, 100.0f);
glUniformMatrix4fv(glGetUniformLocation(shader.Program, "view"), 1, GL_FALSE, glm::value_ptr(view));
glUniformMatrix4fv(glGetUniformLocation(shader.Program, "projection"), 1, GL_FALSE, glm::value_ptr(projection));
// Set light uniforms
glUniform3fv(glGetUniformLocation(shader.Program, "lightPos"), 1, &lightPos[0]);
glUniform3fv(glGetUniformLocation(shader.Program, "viewPos"), 1, &camera.Position[0]);
glUniform1i(glGetUniformLocation(shader.Program, "blinn"), blinn);
// Floor
glm::mat4 view = camera.GetViewMatrix();
shader.setMat4("projection", projection);
shader.setMat4("view", view);
// set light uniforms
shader.setVec3("viewPos", camera.Position);
shader.setVec3("lightPos", lightPos);
shader.setInt("blinn", blinn);
// floor
glBindVertexArray(planeVAO);
glActiveTexture(GL_TEXTURE0);
glBindTexture(GL_TEXTURE_2D, floorTexture);
glDrawArrays(GL_TRIANGLES, 0, 6);
glBindVertexArray(0);
std::cout << (blinn ? "true" : "false") << std::endl;
std::cout << (blinn ? "Blinn-Phong" : "Phong") << std::endl;
// Swap the buffers
// glfw: swap buffers and poll IO events (keys pressed/released, mouse moved etc.)
// -------------------------------------------------------------------------------
glfwSwapBuffers(window);
glfwPollEvents();
}
// optional: de-allocate all resources once they've outlived their purpose:
// ------------------------------------------------------------------------
glDeleteVertexArrays(1, &planeVAO);
glDeleteBuffers(1, &planeVBO);
glfwTerminate();
return 0;
}
// This function loads a texture from file. Note: texture loading functions like these are usually
// managed by a 'Resource Manager' that manages all resources (like textures, models, audio).
// For learning purposes we'll just define it as a utility function.
GLuint loadTexture(GLchar const * path)
// process all input: query GLFW whether relevant keys are pressed/released this frame and react accordingly
// ---------------------------------------------------------------------------------------------------------
void processInput(GLFWwindow *window)
{
// Generate texture ID and load texture data
GLuint textureID;
glGenTextures(1, &textureID);
int width,height;
unsigned char* image = SOIL_load_image(path, &width, &height, 0, SOIL_LOAD_RGB);
// Assign texture to ID
glBindTexture(GL_TEXTURE_2D, textureID);
glTexImage2D(GL_TEXTURE_2D, 0, GL_RGB, width, height, 0, GL_RGB, GL_UNSIGNED_BYTE, image);
glGenerateMipmap(GL_TEXTURE_2D);
if (glfwGetKey(window, GLFW_KEY_ESCAPE) == GLFW_PRESS)
glfwSetWindowShouldClose(window, true);
// Parameters
glTexParameteri( GL_TEXTURE_2D, GL_TEXTURE_WRAP_S, GL_REPEAT );
glTexParameteri( GL_TEXTURE_2D, GL_TEXTURE_WRAP_T, GL_REPEAT );
glTexParameteri( GL_TEXTURE_2D, GL_TEXTURE_MIN_FILTER, GL_LINEAR_MIPMAP_LINEAR );
glTexParameteri( GL_TEXTURE_2D, GL_TEXTURE_MAG_FILTER, GL_LINEAR);
glBindTexture(GL_TEXTURE_2D, 0);
SOIL_free_image_data(image);
return textureID;
}
bool keys[1024];
bool keysPressed[1024];
// Moves/alters the camera positions based on user input
void Do_Movement()
{
// Camera controls
if(keys[GLFW_KEY_W])
float cameraSpeed = 2.5 * deltaTime;
if (glfwGetKey(window, GLFW_KEY_W) == GLFW_PRESS)
camera.ProcessKeyboard(FORWARD, deltaTime);
if(keys[GLFW_KEY_S])
if (glfwGetKey(window, GLFW_KEY_S) == GLFW_PRESS)
camera.ProcessKeyboard(BACKWARD, deltaTime);
if(keys[GLFW_KEY_A])
if (glfwGetKey(window, GLFW_KEY_A) == GLFW_PRESS)
camera.ProcessKeyboard(LEFT, deltaTime);
if(keys[GLFW_KEY_D])
if (glfwGetKey(window, GLFW_KEY_D) == GLFW_PRESS)
camera.ProcessKeyboard(RIGHT, deltaTime);
if (keys[GLFW_KEY_B] && !keysPressed[GLFW_KEY_B])
if (glfwGetKey(window, GLFW_KEY_B) == GLFW_PRESS && !blinnKeyPressed)
{
blinn = !blinn;
keysPressed[GLFW_KEY_B] = true;
blinnKeyPressed = true;
}
}
GLfloat lastX = 400, lastY = 300;
bool firstMouse = true;
// Is called whenever a key is pressed/released via GLFW
void key_callback(GLFWwindow* window, int key, int scancode, int action, int mode)
{
if(key == GLFW_KEY_ESCAPE && action == GLFW_PRESS)
glfwSetWindowShouldClose(window, GL_TRUE);
if (key >= 0 && key <= 1024)
if (glfwGetKey(window, GLFW_KEY_B) == GLFW_RELEASE)
{
if (action == GLFW_PRESS)
keys[key] = true;
else if (action == GLFW_RELEASE)
{
keys[key] = false;
keysPressed[key] = false;
}
blinnKeyPressed = false;
}
}
// glfw: whenever the window size changed (by OS or user resize) this callback function executes
// ---------------------------------------------------------------------------------------------
void framebuffer_size_callback(GLFWwindow* window, int width, int height)
{
// make sure the viewport matches the new window dimensions; note that width and
// height will be significantly larger than specified on retina displays.
glViewport(0, 0, width, height);
}
// glfw: whenever the mouse moves, this callback is called
// -------------------------------------------------------
void mouse_callback(GLFWwindow* window, double xpos, double ypos)
{
if(firstMouse)
if (firstMouse)
{
lastX = xpos;
lastY = ypos;
firstMouse = false;
}
GLfloat xoffset = xpos - lastX;
GLfloat yoffset = lastY - ypos;
float xoffset = xpos - lastX;
float yoffset = lastY - ypos; // reversed since y-coordinates go from bottom to top
lastX = xpos;
lastY = ypos;
camera.ProcessMouseMovement(xoffset, yoffset);
}
}
// glfw: whenever the mouse scroll wheel scrolls, this callback is called
// ----------------------------------------------------------------------
void scroll_callback(GLFWwindow* window, double xoffset, double yoffset)
{
camera.ProcessMouseScroll(yoffset);
}
// utility function for loading a 2D texture from file
// ---------------------------------------------------
unsigned int loadTexture(char const * path)
{
unsigned int textureID;
glGenTextures(1, &textureID);
int width, height, nrComponents;
unsigned char *data = stbi_load(path, &width, &height, &nrComponents, 0);
if (data)
{
GLenum format;
if (nrComponents == 1)
format = GL_RED;
else if (nrComponents == 3)
format = GL_RGB;
else if (nrComponents == 4)
format = GL_RGBA;
glBindTexture(GL_TEXTURE_2D, textureID);
glTexImage2D(GL_TEXTURE_2D, 0, format, width, height, 0, format, GL_UNSIGNED_BYTE, data);
glGenerateMipmap(GL_TEXTURE_2D);
glTexParameteri(GL_TEXTURE_2D, GL_TEXTURE_WRAP_S, format == GL_RGBA ? GL_CLAMP_TO_EDGE : GL_REPEAT); // for this tutorial: use GL_CLAMP_TO_EDGE to prevent semi-transparent borders. Due to interpolation it takes texels from next repeat
glTexParameteri(GL_TEXTURE_2D, GL_TEXTURE_WRAP_T, format == GL_RGBA ? GL_CLAMP_TO_EDGE : GL_REPEAT);
glTexParameteri(GL_TEXTURE_2D, GL_TEXTURE_MIN_FILTER, GL_LINEAR_MIPMAP_LINEAR);
glTexParameteri(GL_TEXTURE_2D, GL_TEXTURE_MAG_FILTER, GL_LINEAR);
stbi_image_free(data);
}
else
{
std::cout << "Texture failed to load at path: " << path << std::endl;
stbi_image_free(data);
}
return textureID;
}

22
src/5.advanced_lighting/1.advanced_lighting/advanced_lighting.vs
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@@ -1,22 +0,0 @@
#version 330 core
layout (location = 0) in vec3 position;
layout (location = 1) in vec3 normal;
layout (location = 2) in vec2 texCoords;
// Declare an interface block; see 'Advanced GLSL' for what these are.
out VS_OUT {
vec3 FragPos;
vec3 Normal;
vec2 TexCoords;
} vs_out;
uniform mat4 projection;
uniform mat4 view;
void main()
{
gl_Position = projection * view * vec4(position, 1.0f);
vs_out.FragPos = position;
vs_out.Normal = normal;
vs_out.TexCoords = texCoords;
}

0
src/5.advanced_lighting/2.gamma_correction/gamma_correction.frag → src/5.advanced_lighting/2.gamma_correction/2.gamma_correction.fs
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0
src/5.advanced_lighting/2.gamma_correction/gamma_correction.vs → src/5.advanced_lighting/2.gamma_correction/2.gamma_correction.vs
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0
src/5.advanced_lighting/3.1.shadow_mapping/debug_quad.vs → src/5.advanced_lighting/3.1.1.shadow_mapping_depth/3.1.1.debug_quad.vs
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0
src/5.advanced_lighting/3.1.shadow_mapping/debug_quad_depth.frag → src/5.advanced_lighting/3.1.1.shadow_mapping_depth/3.1.1.debug_quad_depth.fs
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0
src/5.advanced_lighting/3.1.shadow_mapping/shadow_mapping.frag → src/5.advanced_lighting/3.1.1.shadow_mapping_depth/3.1.1.shadow_mapping.fs
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0
src/5.advanced_lighting/3.1.shadow_mapping/shadow_mapping.vs → src/5.advanced_lighting/3.1.1.shadow_mapping_depth/3.1.1.shadow_mapping.vs
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0
src/5.advanced_lighting/3.1.shadow_mapping/shadow_mapping_depth.frag → src/5.advanced_lighting/3.1.1.shadow_mapping_depth/3.1.1.shadow_mapping_depth.fs
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0
src/5.advanced_lighting/3.1.shadow_mapping/shadow_mapping_depth.vs → src/5.advanced_lighting/3.1.1.shadow_mapping_depth/3.1.1.shadow_mapping_depth.vs
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0
src/5.advanced_lighting/3.1.shadow_mapping/shadow_mapping.cpp → src/5.advanced_lighting/3.1.1.shadow_mapping_depth/shadow_mapping_depth.cpp
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0
src/5.advanced_lighting/6.hdr/hdr.vs → src/5.advanced_lighting/3.1.2.shadow_mapping_base/debug_quad.vs
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20
src/5.advanced_lighting/3.1.2.shadow_mapping_base/debug_quad_depth.fs Normal file
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@@ -0,0 +1,20 @@
#version 330 core
out vec4 color;
in vec2 TexCoords;
uniform sampler2D depthMap;
uniform float near_plane;
uniform float far_plane;
float LinearizeDepth(float depth)
{
float z = depth * 2.0 - 1.0; // Back to NDC
return (2.0 * near_plane * far_plane) / (far_plane + near_plane - z * (far_plane - near_plane));
}
void main()
{
float depthValue = texture(depthMap, TexCoords).r;
// color = vec4(vec3(LinearizeDepth(depthValue) / far_plane), 1.0); // perspective
color = vec4(vec3(depthValue), 1.0); // orthographic
}

78
src/5.advanced_lighting/3.1.2.shadow_mapping_base/shadow_mapping.fs Normal file
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@@ -0,0 +1,78 @@
#version 330 core
out vec4 FragColor;
in VS_OUT {
vec3 FragPos;
vec3 Normal;
vec2 TexCoords;
vec4 FragPosLightSpace;
} fs_in;
uniform sampler2D diffuseTexture;
uniform sampler2D shadowMap;
uniform vec3 lightPos;
uniform vec3 viewPos;
uniform bool shadows;
float ShadowCalculation(vec4 fragPosLightSpace)
{
// perform perspective divide
vec3 projCoords = fragPosLightSpace.xyz / fragPosLightSpace.w;
// Transform to [0,1] range
projCoords = projCoords * 0.5 + 0.5;
// Get closest depth value from light's perspective (using [0,1] range fragPosLight as coords)
float closestDepth = texture(shadowMap, projCoords.xy).r;
// Get depth of current fragment from light's perspective
float currentDepth = projCoords.z;
// Calculate bias (based on depth map resolution and slope)
vec3 normal = normalize(fs_in.Normal);
vec3 lightDir = normalize(lightPos - fs_in.FragPos);
float bias = max(0.05 * (1.0 - dot(normal, lightDir)), 0.005);
// Check whether current frag pos is in shadow
// float shadow = currentDepth - bias > closestDepth ? 1.0 : 0.0;
// PCF
float shadow = 0.0;
vec2 texelSize = 1.0 / textureSize(shadowMap, 0);
for(int x = -1; x <= 1; ++x)
{
for(int y = -1; y <= 1; ++y)
{
float pcfDepth = texture(shadowMap, projCoords.xy + vec2(x, y) * texelSize).r;
shadow += currentDepth - bias > pcfDepth ? 1.0 : 0.0;
}
}
shadow /= 9.0;
// Keep the shadow at 0.0 when outside the far_plane region of the light's frustum.
if(projCoords.z > 1.0)
shadow = 0.0;
return shadow;
}
void main()
{
vec3 color = texture(diffuseTexture, fs_in.TexCoords).rgb;
vec3 normal = normalize(fs_in.Normal);
vec3 lightColor = vec3(0.3);
// Ambient
vec3 ambient = 0.3 * color;
// Diffuse
vec3 lightDir = normalize(lightPos - fs_in.FragPos);
float diff = max(dot(lightDir, normal), 0.0);
vec3 diffuse = diff * lightColor;
// Specular
vec3 viewDir = normalize(viewPos - fs_in.FragPos);
vec3 reflectDir = reflect(-lightDir, normal);
float spec = 0.0;
vec3 halfwayDir = normalize(lightDir + viewDir);
spec = pow(max(dot(normal, halfwayDir), 0.0), 64.0);
vec3 specular = spec * lightColor;
// Calculate shadow
float shadow = shadows ? ShadowCalculation(fs_in.FragPosLightSpace) : 0.0;
vec3 lighting = (ambient + (1.0 - shadow) * (diffuse + specular)) * color;
FragColor = vec4(lighting, 1.0f);
}

27
src/5.advanced_lighting/3.1.2.shadow_mapping_base/shadow_mapping.vs Normal file
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@@ -0,0 +1,27 @@
#version 330 core
layout (location = 0) in vec3 position;
layout (location = 1) in vec3 normal;
layout (location = 2) in vec2 texCoords;
out vec2 TexCoords;
out VS_OUT {
vec3 FragPos;
vec3 Normal;
vec2 TexCoords;
vec4 FragPosLightSpace;
} vs_out;
uniform mat4 projection;
uniform mat4 view;
uniform mat4 model;
uniform mat4 lightSpaceMatrix;
void main()
{
gl_Position = projection * view * model * vec4(position, 1.0f);
vs_out.FragPos = vec3(model * vec4(position, 1.0));
vs_out.Normal = transpose(inverse(mat3(model))) * normal;
vs_out.TexCoords = texCoords;
vs_out.FragPosLightSpace = lightSpaceMatrix * vec4(vs_out.FragPos, 1.0);
}

435
src/5.advanced_lighting/3.1.2.shadow_mapping_base/shadow_mapping_base.cpp Normal file
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// GLEW
#define GLEW_STATIC
#include <GL/glew.h>
// GLFW
#include <GLFW/glfw3.h>
// GL includes
#include <learnopengl/shader.h>
#include <learnopengl/camera.h>
// GLM Mathemtics
#include <glm/glm.hpp>
#include <glm/gtc/matrix_transform.hpp>
#include <glm/gtc/type_ptr.hpp>
// Other Libs
#include <SOIL.h>
#include <learnopengl/filesystem.h>
// Properties
const GLuint SCR_WIDTH = 800, SCR_HEIGHT = 600;
// Function prototypes
void key_callback(GLFWwindow* window, int key, int scancode, int action, int mode);
void scroll_callback(GLFWwindow* window, double xoffset, double yoffset);
void mouse_callback(GLFWwindow* window, double xpos, double ypos);
void Do_Movement();
GLuint loadTexture(GLchar const * path);
void RenderScene(Shader &shader);
void RenderCube();
void RenderQuad();
// Camera
Camera camera(glm::vec3(0.0f, 0.0f, 3.0f));
// Delta
GLfloat deltaTime = 0.0f;
GLfloat lastFrame = 0.0f;
// Options
GLboolean shadows = true;
// Global variables
GLuint woodTexture;
GLuint planeVAO;
// The MAIN function, from here we start our application and run our Game loop
int main()
{
// Init GLFW
glfwInit();
glfwWindowHint(GLFW_CONTEXT_VERSION_MAJOR, 3);
glfwWindowHint(GLFW_CONTEXT_VERSION_MINOR, 3);
glfwWindowHint(GLFW_OPENGL_PROFILE, GLFW_OPENGL_CORE_PROFILE);
glfwWindowHint(GLFW_RESIZABLE, GL_FALSE);
GLFWwindow* window = glfwCreateWindow(SCR_WIDTH, SCR_HEIGHT, "LearnOpenGL", nullptr, nullptr); // Windowed
glfwMakeContextCurrent(window);
// Set the required callback functions
glfwSetKeyCallback(window, key_callback);
glfwSetCursorPosCallback(window, mouse_callback);
glfwSetScrollCallback(window, scroll_callback);
// Options
glfwSetInputMode(window, GLFW_CURSOR, GLFW_CURSOR_DISABLED);
// Initialize GLEW to setup the OpenGL Function pointers
glewExperimental = GL_TRUE;
glewInit();
// Define the viewport dimensions
glViewport(0, 0, SCR_WIDTH, SCR_HEIGHT);
// Setup some OpenGL options
glEnable(GL_DEPTH_TEST);
// Setup and compile our shaders
Shader shader("shadow_mapping.vs", "shadow_mapping.frag");
Shader simpleDepthShader("shadow_mapping_depth.vs", "shadow_mapping_depth.frag");
Shader debugDepthQuad("debug_quad.vs", "debug_quad_depth.frag");
// Set texture samples
shader.Use();
glUniform1i(glGetUniformLocation(shader.Program, "diffuseTexture"), 0);
glUniform1i(glGetUniformLocation(shader.Program, "shadowMap"), 1);
GLfloat planeVertices[] = {
// Positions // Normals // Texture Coords
25.0f, -0.5f, 25.0f, 0.0f, 1.0f, 0.0f, 25.0f, 0.0f,
-25.0f, -0.5f, -25.0f, 0.0f, 1.0f, 0.0f, 0.0f, 25.0f,
-25.0f, -0.5f, 25.0f, 0.0f, 1.0f, 0.0f, 0.0f, 0.0f,
25.0f, -0.5f, 25.0f, 0.0f, 1.0f, 0.0f, 25.0f, 0.0f,
25.0f, -0.5f, -25.0f, 0.0f, 1.0f, 0.0f, 25.0f, 25.0f,
-25.0f, -0.5f, -25.0f, 0.0f, 1.0f, 0.0f, 0.0f, 25.0f
};
// Setup plane VAO
GLuint planeVBO;
glGenVertexArrays(1, &planeVAO);
glGenBuffers(1, &planeVBO);
glBindVertexArray(planeVAO);
glBindBuffer(GL_ARRAY_BUFFER, planeVBO);
glBufferData(GL_ARRAY_BUFFER, sizeof(planeVertices), &planeVertices, GL_STATIC_DRAW);
glEnableVertexAttribArray(0);
glVertexAttribPointer(0, 3, GL_FLOAT, GL_FALSE, 8 * sizeof(GLfloat), (GLvoid*)0);
glEnableVertexAttribArray(1);
glVertexAttribPointer(1, 3, GL_FLOAT, GL_FALSE, 8 * sizeof(GLfloat), (GLvoid*)(3 * sizeof(GLfloat)));
glEnableVertexAttribArray(2);
glVertexAttribPointer(2, 2, GL_FLOAT, GL_FALSE, 8 * sizeof(GLfloat), (GLvoid*)(6 * sizeof(GLfloat)));
glBindVertexArray(0);
// Light source
glm::vec3 lightPos(-2.0f, 4.0f, -1.0f);
// Load textures
woodTexture = loadTexture(FileSystem::getPath("resources/textures/wood.png").c_str());
// Configure depth map FBO
const GLuint SHADOW_WIDTH = 1024, SHADOW_HEIGHT = 1024;
GLuint depthMapFBO;
glGenFramebuffers(1, &depthMapFBO);
// - Create depth texture
GLuint depthMap;
glGenTextures(1, &depthMap);
glBindTexture(GL_TEXTURE_2D, depthMap);
glTexImage2D(GL_TEXTURE_2D, 0, GL_DEPTH_COMPONENT, SHADOW_WIDTH, SHADOW_HEIGHT, 0, GL_DEPTH_COMPONENT, GL_FLOAT, NULL);
glTexParameteri(GL_TEXTURE_2D, GL_TEXTURE_MIN_FILTER, GL_NEAREST);
glTexParameteri(GL_TEXTURE_2D, GL_TEXTURE_MAG_FILTER, GL_NEAREST);
glTexParameteri(GL_TEXTURE_2D, GL_TEXTURE_WRAP_S, GL_CLAMP_TO_BORDER);
glTexParameteri(GL_TEXTURE_2D, GL_TEXTURE_WRAP_T, GL_CLAMP_TO_BORDER);
GLfloat borderColor[] = { 1.0, 1.0, 1.0, 1.0 };
glTexParameterfv(GL_TEXTURE_2D, GL_TEXTURE_BORDER_COLOR, borderColor);
glBindFramebuffer(GL_FRAMEBUFFER, depthMapFBO);
glFramebufferTexture2D(GL_FRAMEBUFFER, GL_DEPTH_ATTACHMENT, GL_TEXTURE_2D, depthMap, 0);
glDrawBuffer(GL_NONE);
glReadBuffer(GL_NONE);
glBindFramebuffer(GL_FRAMEBUFFER, 0);
glClearColor(0.1f, 0.1f, 0.1f, 1.0f);
// Game loop
while (!glfwWindowShouldClose(window))
{
// Set frame time
GLfloat currentFrame = glfwGetTime();
deltaTime = currentFrame - lastFrame;
lastFrame = currentFrame;
// Check and call events
glfwPollEvents();
Do_Movement();
// Change light position over time
lightPos.z = cos(glfwGetTime()) * 2.0f;
// 1. Render depth of scene to texture (from light's perspective)
// - Get light projection/view matrix.
glm::mat4 lightProjection, lightView;
glm::mat4 lightSpaceMatrix;
GLfloat near_plane = 1.0f, far_plane = 7.5f;
lightProjection = glm::ortho(-10.0f, 10.0f, -10.0f, 10.0f, near_plane, far_plane);
//lightProjection = glm::perspective(45.0f, (GLfloat)SHADOW_WIDTH / (GLfloat)SHADOW_HEIGHT, near_plane, far_plane); // Note that if you use a perspective projection matrix you'll have to change the light position as the current light position isn't enough to reflect the whole scene.
lightView = glm::lookAt(lightPos, glm::vec3(0.0f), glm::vec3(0.0, 1.0, 0.0));
lightSpaceMatrix = lightProjection * lightView;
// - now render scene from light's point of view
simpleDepthShader.Use();
glUniformMatrix4fv(glGetUniformLocation(simpleDepthShader.Program, "lightSpaceMatrix"), 1, GL_FALSE, glm::value_ptr(lightSpaceMatrix));
glViewport(0, 0, SHADOW_WIDTH, SHADOW_HEIGHT);
glBindFramebuffer(GL_FRAMEBUFFER, depthMapFBO);
glClear(GL_DEPTH_BUFFER_BIT);
RenderScene(simpleDepthShader);
glBindFramebuffer(GL_FRAMEBUFFER, 0);
// 2. Render scene as normal
glViewport(0, 0, SCR_WIDTH, SCR_HEIGHT);
glClear(GL_COLOR_BUFFER_BIT | GL_DEPTH_BUFFER_BIT);
shader.Use();
glm::mat4 projection = glm::perspective(camera.Zoom, (float)SCR_WIDTH / (float)SCR_HEIGHT, 0.1f, 100.0f);
glm::mat4 view = camera.GetViewMatrix();
glUniformMatrix4fv(glGetUniformLocation(shader.Program, "projection"), 1, GL_FALSE, glm::value_ptr(projection));
glUniformMatrix4fv(glGetUniformLocation(shader.Program, "view"), 1, GL_FALSE, glm::value_ptr(view));
// Set light uniforms
glUniform3fv(glGetUniformLocation(shader.Program, "lightPos"), 1, &lightPos[0]);
glUniform3fv(glGetUniformLocation(shader.Program, "viewPos"), 1, &camera.Position[0]);
glUniformMatrix4fv(glGetUniformLocation(shader.Program, "lightSpaceMatrix"), 1, GL_FALSE, glm::value_ptr(lightSpaceMatrix));
// Enable/Disable shadows by pressing 'SPACE'
glUniform1i(glGetUniformLocation(shader.Program, "shadows"), shadows);
glActiveTexture(GL_TEXTURE0);
glBindTexture(GL_TEXTURE_2D, woodTexture);
glActiveTexture(GL_TEXTURE1);
glBindTexture(GL_TEXTURE_2D, depthMap);
RenderScene(shader);
// 3. DEBUG: visualize depth map by rendering it to plane
debugDepthQuad.Use();
glUniform1f(glGetUniformLocation(debugDepthQuad.Program, "near_plane"), near_plane);
glUniform1f(glGetUniformLocation(debugDepthQuad.Program, "far_plane"), far_plane);
glActiveTexture(GL_TEXTURE0);
glBindTexture(GL_TEXTURE_2D, depthMap);
//RenderQuad(); // uncomment this line to see depth map
// Swap the buffers
glfwSwapBuffers(window);
}
glfwTerminate();
return 0;
}
void RenderScene(Shader &shader)
{
// Floor
glm::mat4 model;
glUniformMatrix4fv(glGetUniformLocation(shader.Program, "model"), 1, GL_FALSE, glm::value_ptr(model));
glBindVertexArray(planeVAO);
glDrawArrays(GL_TRIANGLES, 0, 6);
glBindVertexArray(0);
// Cubes
model = glm::mat4();
model = glm::translate(model, glm::vec3(0.0f, 1.5f, 0.0));
glUniformMatrix4fv(glGetUniformLocation(shader.Program, "model"), 1, GL_FALSE, glm::value_ptr(model));
RenderCube();
model = glm::mat4();
model = glm::translate(model, glm::vec3(2.0f, 0.0f, 1.0));
glUniformMatrix4fv(glGetUniformLocation(shader.Program, "model"), 1, GL_FALSE, glm::value_ptr(model));
RenderCube();
model = glm::mat4();
model = glm::translate(model, glm::vec3(-1.0f, 0.0f, 2.0));
model = glm::rotate(model, 60.0f, glm::normalize(glm::vec3(1.0, 0.0, 1.0)));
model = glm::scale(model, glm::vec3(0.5));
glUniformMatrix4fv(glGetUniformLocation(shader.Program, "model"), 1, GL_FALSE, glm::value_ptr(model));
RenderCube();
}
// RenderQuad() Renders a 1x1 quad in NDC, best used for framebuffer color targets
// and post-processing effects.
GLuint quadVAO = 0;
GLuint quadVBO;
void RenderQuad()
{
if (quadVAO == 0)
{
GLfloat quadVertices[] = {
// Positions // Texture Coords
-1.0f, 1.0f, 0.0f, 0.0f, 1.0f,
-1.0f, -1.0f, 0.0f, 0.0f, 0.0f,
1.0f, 1.0f, 0.0f, 1.0f, 1.0f,
1.0f, -1.0f, 0.0f, 1.0f, 0.0f,
};
// Setup plane VAO
glGenVertexArrays(1, &quadVAO);
glGenBuffers(1, &quadVBO);
glBindVertexArray(quadVAO);
glBindBuffer(GL_ARRAY_BUFFER, quadVBO);
glBufferData(GL_ARRAY_BUFFER, sizeof(quadVertices), &quadVertices, GL_STATIC_DRAW);
glEnableVertexAttribArray(0);
glVertexAttribPointer(0, 3, GL_FLOAT, GL_FALSE, 5 * sizeof(GLfloat), (GLvoid*)0);
glEnableVertexAttribArray(1);
glVertexAttribPointer(1, 2, GL_FLOAT, GL_FALSE, 5 * sizeof(GLfloat), (GLvoid*)(3 * sizeof(GLfloat)));
}
glBindVertexArray(quadVAO);
glDrawArrays(GL_TRIANGLE_STRIP, 0, 4);
glBindVertexArray(0);
}
// RenderCube() Renders a 1x1 3D cube in NDC.
GLuint cubeVAO = 0;
GLuint cubeVBO = 0;
void RenderCube()
{
// Initialize (if necessary)
if (cubeVAO == 0)
{
GLfloat vertices[] = {
// Back face
-0.5f, -0.5f, -0.5f, 0.0f, 0.0f, -1.0f, 0.0f, 0.0f, // Bottom-left
0.5f, 0.5f, -0.5f, 0.0f, 0.0f, -1.0f, 1.0f, 1.0f, // top-right
0.5f, -0.5f, -0.5f, 0.0f, 0.0f, -1.0f, 1.0f, 0.0f, // bottom-right
0.5f, 0.5f, -0.5f, 0.0f, 0.0f, -1.0f, 1.0f, 1.0f, // top-right
-0.5f, -0.5f, -0.5f, 0.0f, 0.0f, -1.0f, 0.0f, 0.0f, // bottom-left
-0.5f, 0.5f, -0.5f, 0.0f, 0.0f, -1.0f, 0.0f, 1.0f,// top-left
// Front face
-0.5f, -0.5f, 0.5f, 0.0f, 0.0f, 1.0f, 0.0f, 0.0f, // bottom-left
0.5f, -0.5f, 0.5f, 0.0f, 0.0f, 1.0f, 1.0f, 0.0f, // bottom-right
0.5f, 0.5f, 0.5f, 0.0f, 0.0f, 1.0f, 1.0f, 1.0f, // top-right
0.5f, 0.5f, 0.5f, 0.0f, 0.0f, 1.0f, 1.0f, 1.0f, // top-right
-0.5f, 0.5f, 0.5f, 0.0f, 0.0f, 1.0f, 0.0f, 1.0f, // top-left
-0.5f, -0.5f, 0.5f, 0.0f, 0.0f, 1.0f, 0.0f, 0.0f, // bottom-left
// Left face
-0.5f, 0.5f, 0.5f, -1.0f, 0.0f, 0.0f, 1.0f, 0.0f, // top-right
-0.5f, 0.5f, -0.5f, -1.0f, 0.0f, 0.0f, 1.0f, 1.0f, // top-left
-0.5f, -0.5f, -0.5f, -1.0f, 0.0f, 0.0f, 0.0f, 1.0f, // bottom-left
-0.5f, -0.5f, -0.5f, -1.0f, 0.0f, 0.0f, 0.0f, 1.0f, // bottom-left
-0.5f, -0.5f, 0.5f, -1.0f, 0.0f, 0.0f, 0.0f, 0.0f, // bottom-right
-0.5f, 0.5f, 0.5f, -1.0f, 0.0f, 0.0f, 1.0f, 0.0f, // top-right
// Right face
0.5f, 0.5f, 0.5f, 1.0f, 0.0f, 0.0f, 1.0f, 0.0f, // top-left
0.5f, -0.5f, -0.5f, 1.0f, 0.0f, 0.0f, 0.0f, 1.0f, // bottom-right
0.5f, 0.5f, -0.5f, 1.0f, 0.0f, 0.0f, 1.0f, 1.0f, // top-right
0.5f, -0.5f, -0.5f, 1.0f, 0.0f, 0.0f, 0.0f, 1.0f, // bottom-right
0.5f, 0.5f, 0.5f, 1.0f, 0.0f, 0.0f, 1.0f, 0.0f, // top-left
0.5f, -0.5f, 0.5f, 1.0f, 0.0f, 0.0f, 0.0f, 0.0f, // bottom-left
// Bottom face
-0.5f, -0.5f, -0.5f, 0.0f, -1.0f, 0.0f, 0.0f, 1.0f, // top-right
0.5f, -0.5f, -0.5f, 0.0f, -1.0f, 0.0f, 1.0f, 1.0f, // top-left
0.5f, -0.5f, 0.5f, 0.0f, -1.0f, 0.0f, 1.0f, 0.0f,// bottom-left
0.5f, -0.5f, 0.5f, 0.0f, -1.0f, 0.0f, 1.0f, 0.0f, // bottom-left
-0.5f, -0.5f, 0.5f, 0.0f, -1.0f, 0.0f, 0.0f, 0.0f, // bottom-right
-0.5f, -0.5f, -0.5f, 0.0f, -1.0f, 0.0f, 0.0f, 1.0f, // top-right
// Top face
-0.5f, 0.5f, -0.5f, 0.0f, 1.0f, 0.0f, 0.0f, 1.0f,// top-left
0.5f, 0.5f, 0.5f, 0.0f, 1.0f, 0.0f, 1.0f, 0.0f, // bottom-right
0.5f, 0.5f, -0.5f, 0.0f, 1.0f, 0.0f, 1.0f, 1.0f, // top-right
0.5f, 0.5f, 0.5f, 0.0f, 1.0f, 0.0f, 1.0f, 0.0f, // bottom-right
-0.5f, 0.5f, -0.5f, 0.0f, 1.0f, 0.0f, 0.0f, 1.0f,// top-left
-0.5f, 0.5f, 0.5f, 0.0f, 1.0f, 0.0f, 0.0f, 0.0f // bottom-left
};
glGenVertexArrays(1, &cubeVAO);
glGenBuffers(1, &cubeVBO);
// Fill buffer
glBindBuffer(GL_ARRAY_BUFFER, cubeVBO);
glBufferData(GL_ARRAY_BUFFER, sizeof(vertices), vertices, GL_STATIC_DRAW);
// Link vertex attributes
glBindVertexArray(cubeVAO);
glEnableVertexAttribArray(0);
glVertexAttribPointer(0, 3, GL_FLOAT, GL_FALSE, 8 * sizeof(GLfloat), (GLvoid*)0);
glEnableVertexAttribArray(1);
glVertexAttribPointer(1, 3, GL_FLOAT, GL_FALSE, 8 * sizeof(GLfloat), (GLvoid*)(3 * sizeof(GLfloat)));
glEnableVertexAttribArray(2);
glVertexAttribPointer(2, 2, GL_FLOAT, GL_FALSE, 8 * sizeof(GLfloat), (GLvoid*)(6 * sizeof(GLfloat)));
glBindBuffer(GL_ARRAY_BUFFER, 0);
glBindVertexArray(0);
}
// Render Cube
glBindVertexArray(cubeVAO);
glDrawArrays(GL_TRIANGLES, 0, 36);
glBindVertexArray(0);
}
// This function loads a texture from file. Note: texture loading functions like these are usually
// managed by a 'Resource Manager' that manages all resources (like textures, models, audio).
// For learning purposes we'll just define it as a utility function.
GLuint loadTexture(GLchar const * path)
{
// Generate texture ID and load texture data
GLuint textureID;
glGenTextures(1, &textureID);
int width, height;
unsigned char* image = SOIL_load_image(path, &width, &height, 0, SOIL_LOAD_RGB);
// Assign texture to ID
glBindTexture(GL_TEXTURE_2D, textureID);
glTexImage2D(GL_TEXTURE_2D, 0, GL_RGB, width, height, 0, GL_RGB, GL_UNSIGNED_BYTE, image);
glGenerateMipmap(GL_TEXTURE_2D);
// Parameters
glTexParameteri(GL_TEXTURE_2D, GL_TEXTURE_WRAP_S, GL_REPEAT);
glTexParameteri(GL_TEXTURE_2D, GL_TEXTURE_WRAP_T, GL_REPEAT);
glTexParameteri(GL_TEXTURE_2D, GL_TEXTURE_MIN_FILTER, GL_LINEAR_MIPMAP_LINEAR);
glTexParameteri(GL_TEXTURE_2D, GL_TEXTURE_MAG_FILTER, GL_LINEAR);
glBindTexture(GL_TEXTURE_2D, 0);
SOIL_free_image_data(image);
return textureID;
}
bool keys[1024];
bool keysPressed[1024];
// Moves/alters the camera positions based on user input
void Do_Movement()
{
// Camera controls
if (keys[GLFW_KEY_W])
camera.ProcessKeyboard(FORWARD, deltaTime);
if (keys[GLFW_KEY_S])
camera.ProcessKeyboard(BACKWARD, deltaTime);
if (keys[GLFW_KEY_A])
camera.ProcessKeyboard(LEFT, deltaTime);
if (keys[GLFW_KEY_D])
camera.ProcessKeyboard(RIGHT, deltaTime);
if (keys[GLFW_KEY_SPACE] && !keysPressed[GLFW_KEY_SPACE])
{
shadows = !shadows;
keysPressed[GLFW_KEY_SPACE] = true;
}
}
GLfloat lastX = 400, lastY = 300;
bool firstMouse = true;
// Is called whenever a key is pressed/released via GLFW
void key_callback(GLFWwindow* window, int key, int scancode, int action, int mode)
{
if (key == GLFW_KEY_ESCAPE && action == GLFW_PRESS)
glfwSetWindowShouldClose(window, GL_TRUE);
if (key >= 0 && key <= 1024)
{
if (action == GLFW_PRESS)
keys[key] = true;
else if (action == GLFW_RELEASE)
{
keys[key] = false;
keysPressed[key] = false;
}
}
}
void mouse_callback(GLFWwindow* window, double xpos, double ypos)
{
if (firstMouse)
{
lastX = xpos;
lastY = ypos;
firstMouse = false;
}
GLfloat xoffset = xpos - lastX;
GLfloat yoffset = lastY - ypos;
lastX = xpos;
lastY = ypos;
camera.ProcessMouseMovement(xoffset, yoffset);
}
void scroll_callback(GLFWwindow* window, double xoffset, double yoffset)
{
camera.ProcessMouseScroll(yoffset);
}

6
src/5.advanced_lighting/3.1.2.shadow_mapping_base/shadow_mapping_depth.fs Normal file
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@@ -0,0 +1,6 @@
#version 330 core
void main()
{
// gl_FragDepth = gl_FragCoord.z;
}

10
src/5.advanced_lighting/3.1.2.shadow_mapping_base/shadow_mapping_depth.vs Normal file
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@@ -0,0 +1,10 @@
#version 330 core
layout (location = 0) in vec3 position;
uniform mat4 lightSpaceMatrix;
uniform mat4 model;
void main()
{
gl_Position = lightSpaceMatrix * model * vec4(position, 1.0f);
}

0
src/5.advanced_lighting/7.bloom/bloom_final.vs → src/5.advanced_lighting/3.1.3.shadow_mapping/debug_quad.vs
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20
src/5.advanced_lighting/3.1.3.shadow_mapping/debug_quad_depth.fs Normal file
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@@ -0,0 +1,20 @@
#version 330 core
out vec4 color;
in vec2 TexCoords;
uniform sampler2D depthMap;
uniform float near_plane;
uniform float far_plane;
float LinearizeDepth(float depth)
{
float z = depth * 2.0 - 1.0; // Back to NDC
return (2.0 * near_plane * far_plane) / (far_plane + near_plane - z * (far_plane - near_plane));
}
void main()
{
float depthValue = texture(depthMap, TexCoords).r;
// color = vec4(vec3(LinearizeDepth(depthValue) / far_plane), 1.0); // perspective
color = vec4(vec3(depthValue), 1.0); // orthographic
}

435
src/5.advanced_lighting/3.1.3.shadow_mapping/shadow_mapping.cpp Normal file
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@@ -0,0 +1,435 @@
// GLEW
#define GLEW_STATIC
#include <GL/glew.h>
// GLFW
#include <GLFW/glfw3.h>
// GL includes
#include <learnopengl/shader.h>
#include <learnopengl/camera.h>
// GLM Mathemtics
#include <glm/glm.hpp>
#include <glm/gtc/matrix_transform.hpp>
#include <glm/gtc/type_ptr.hpp>
// Other Libs
#include <SOIL.h>
#include <learnopengl/filesystem.h>
// Properties
const GLuint SCR_WIDTH = 800, SCR_HEIGHT = 600;
// Function prototypes
void key_callback(GLFWwindow* window, int key, int scancode, int action, int mode);
void scroll_callback(GLFWwindow* window, double xoffset, double yoffset);
void mouse_callback(GLFWwindow* window, double xpos, double ypos);
void Do_Movement();
GLuint loadTexture(GLchar const * path);
void RenderScene(Shader &shader);
void RenderCube();
void RenderQuad();
// Camera
Camera camera(glm::vec3(0.0f, 0.0f, 3.0f));
// Delta
GLfloat deltaTime = 0.0f;
GLfloat lastFrame = 0.0f;
// Options
GLboolean shadows = true;
// Global variables
GLuint woodTexture;
GLuint planeVAO;
// The MAIN function, from here we start our application and run our Game loop
int main()
{
// Init GLFW
glfwInit();
glfwWindowHint(GLFW_CONTEXT_VERSION_MAJOR, 3);
glfwWindowHint(GLFW_CONTEXT_VERSION_MINOR, 3);
glfwWindowHint(GLFW_OPENGL_PROFILE, GLFW_OPENGL_CORE_PROFILE);
glfwWindowHint(GLFW_RESIZABLE, GL_FALSE);
GLFWwindow* window = glfwCreateWindow(SCR_WIDTH, SCR_HEIGHT, "LearnOpenGL", nullptr, nullptr); // Windowed
glfwMakeContextCurrent(window);
// Set the required callback functions
glfwSetKeyCallback(window, key_callback);
glfwSetCursorPosCallback(window, mouse_callback);
glfwSetScrollCallback(window, scroll_callback);
// Options
glfwSetInputMode(window, GLFW_CURSOR, GLFW_CURSOR_DISABLED);
// Initialize GLEW to setup the OpenGL Function pointers
glewExperimental = GL_TRUE;
glewInit();
// Define the viewport dimensions
glViewport(0, 0, SCR_WIDTH, SCR_HEIGHT);
// Setup some OpenGL options
glEnable(GL_DEPTH_TEST);
// Setup and compile our shaders
Shader shader("shadow_mapping.vs", "shadow_mapping.frag");
Shader simpleDepthShader("shadow_mapping_depth.vs", "shadow_mapping_depth.frag");
Shader debugDepthQuad("debug_quad.vs", "debug_quad_depth.frag");
// Set texture samples
shader.Use();
glUniform1i(glGetUniformLocation(shader.Program, "diffuseTexture"), 0);
glUniform1i(glGetUniformLocation(shader.Program, "shadowMap"), 1);
GLfloat planeVertices[] = {
// Positions // Normals // Texture Coords
25.0f, -0.5f, 25.0f, 0.0f, 1.0f, 0.0f, 25.0f, 0.0f,
-25.0f, -0.5f, -25.0f, 0.0f, 1.0f, 0.0f, 0.0f, 25.0f,
-25.0f, -0.5f, 25.0f, 0.0f, 1.0f, 0.0f, 0.0f, 0.0f,
25.0f, -0.5f, 25.0f, 0.0f, 1.0f, 0.0f, 25.0f, 0.0f,
25.0f, -0.5f, -25.0f, 0.0f, 1.0f, 0.0f, 25.0f, 25.0f,
-25.0f, -0.5f, -25.0f, 0.0f, 1.0f, 0.0f, 0.0f, 25.0f
};
// Setup plane VAO
GLuint planeVBO;
glGenVertexArrays(1, &planeVAO);
glGenBuffers(1, &planeVBO);
glBindVertexArray(planeVAO);
glBindBuffer(GL_ARRAY_BUFFER, planeVBO);
glBufferData(GL_ARRAY_BUFFER, sizeof(planeVertices), &planeVertices, GL_STATIC_DRAW);
glEnableVertexAttribArray(0);
glVertexAttribPointer(0, 3, GL_FLOAT, GL_FALSE, 8 * sizeof(GLfloat), (GLvoid*)0);
glEnableVertexAttribArray(1);
glVertexAttribPointer(1, 3, GL_FLOAT, GL_FALSE, 8 * sizeof(GLfloat), (GLvoid*)(3 * sizeof(GLfloat)));
glEnableVertexAttribArray(2);
glVertexAttribPointer(2, 2, GL_FLOAT, GL_FALSE, 8 * sizeof(GLfloat), (GLvoid*)(6 * sizeof(GLfloat)));
glBindVertexArray(0);
// Light source
glm::vec3 lightPos(-2.0f, 4.0f, -1.0f);
// Load textures
woodTexture = loadTexture(FileSystem::getPath("resources/textures/wood.png").c_str());
// Configure depth map FBO
const GLuint SHADOW_WIDTH = 1024, SHADOW_HEIGHT = 1024;
GLuint depthMapFBO;
glGenFramebuffers(1, &depthMapFBO);
// - Create depth texture
GLuint depthMap;
glGenTextures(1, &depthMap);
glBindTexture(GL_TEXTURE_2D, depthMap);
glTexImage2D(GL_TEXTURE_2D, 0, GL_DEPTH_COMPONENT, SHADOW_WIDTH, SHADOW_HEIGHT, 0, GL_DEPTH_COMPONENT, GL_FLOAT, NULL);
glTexParameteri(GL_TEXTURE_2D, GL_TEXTURE_MIN_FILTER, GL_NEAREST);
glTexParameteri(GL_TEXTURE_2D, GL_TEXTURE_MAG_FILTER, GL_NEAREST);
glTexParameteri(GL_TEXTURE_2D, GL_TEXTURE_WRAP_S, GL_CLAMP_TO_BORDER);
glTexParameteri(GL_TEXTURE_2D, GL_TEXTURE_WRAP_T, GL_CLAMP_TO_BORDER);
GLfloat borderColor[] = { 1.0, 1.0, 1.0, 1.0 };
glTexParameterfv(GL_TEXTURE_2D, GL_TEXTURE_BORDER_COLOR, borderColor);
glBindFramebuffer(GL_FRAMEBUFFER, depthMapFBO);
glFramebufferTexture2D(GL_FRAMEBUFFER, GL_DEPTH_ATTACHMENT, GL_TEXTURE_2D, depthMap, 0);
glDrawBuffer(GL_NONE);
glReadBuffer(GL_NONE);
glBindFramebuffer(GL_FRAMEBUFFER, 0);
glClearColor(0.1f, 0.1f, 0.1f, 1.0f);
// Game loop
while (!glfwWindowShouldClose(window))
{
// Set frame time
GLfloat currentFrame = glfwGetTime();
deltaTime = currentFrame - lastFrame;
lastFrame = currentFrame;
// Check and call events
glfwPollEvents();
Do_Movement();
// Change light position over time
lightPos.z = cos(glfwGetTime()) * 2.0f;
// 1. Render depth of scene to texture (from light's perspective)
// - Get light projection/view matrix.
glm::mat4 lightProjection, lightView;
glm::mat4 lightSpaceMatrix;
GLfloat near_plane = 1.0f, far_plane = 7.5f;
lightProjection = glm::ortho(-10.0f, 10.0f, -10.0f, 10.0f, near_plane, far_plane);
//lightProjection = glm::perspective(45.0f, (GLfloat)SHADOW_WIDTH / (GLfloat)SHADOW_HEIGHT, near_plane, far_plane); // Note that if you use a perspective projection matrix you'll have to change the light position as the current light position isn't enough to reflect the whole scene.
lightView = glm::lookAt(lightPos, glm::vec3(0.0f), glm::vec3(0.0, 1.0, 0.0));
lightSpaceMatrix = lightProjection * lightView;
// - now render scene from light's point of view
simpleDepthShader.Use();
glUniformMatrix4fv(glGetUniformLocation(simpleDepthShader.Program, "lightSpaceMatrix"), 1, GL_FALSE, glm::value_ptr(lightSpaceMatrix));
glViewport(0, 0, SHADOW_WIDTH, SHADOW_HEIGHT);
glBindFramebuffer(GL_FRAMEBUFFER, depthMapFBO);
glClear(GL_DEPTH_BUFFER_BIT);
RenderScene(simpleDepthShader);
glBindFramebuffer(GL_FRAMEBUFFER, 0);
// 2. Render scene as normal
glViewport(0, 0, SCR_WIDTH, SCR_HEIGHT);
glClear(GL_COLOR_BUFFER_BIT | GL_DEPTH_BUFFER_BIT);
shader.Use();
glm::mat4 projection = glm::perspective(camera.Zoom, (float)SCR_WIDTH / (float)SCR_HEIGHT, 0.1f, 100.0f);
glm::mat4 view = camera.GetViewMatrix();
glUniformMatrix4fv(glGetUniformLocation(shader.Program, "projection"), 1, GL_FALSE, glm::value_ptr(projection));
glUniformMatrix4fv(glGetUniformLocation(shader.Program, "view"), 1, GL_FALSE, glm::value_ptr(view));
// Set light uniforms
glUniform3fv(glGetUniformLocation(shader.Program, "lightPos"), 1, &lightPos[0]);
glUniform3fv(glGetUniformLocation(shader.Program, "viewPos"), 1, &camera.Position[0]);
glUniformMatrix4fv(glGetUniformLocation(shader.Program, "lightSpaceMatrix"), 1, GL_FALSE, glm::value_ptr(lightSpaceMatrix));
// Enable/Disable shadows by pressing 'SPACE'
glUniform1i(glGetUniformLocation(shader.Program, "shadows"), shadows);
glActiveTexture(GL_TEXTURE0);
glBindTexture(GL_TEXTURE_2D, woodTexture);
glActiveTexture(GL_TEXTURE1);
glBindTexture(GL_TEXTURE_2D, depthMap);
RenderScene(shader);
// 3. DEBUG: visualize depth map by rendering it to plane
debugDepthQuad.Use();
glUniform1f(glGetUniformLocation(debugDepthQuad.Program, "near_plane"), near_plane);
glUniform1f(glGetUniformLocation(debugDepthQuad.Program, "far_plane"), far_plane);
glActiveTexture(GL_TEXTURE0);
glBindTexture(GL_TEXTURE_2D, depthMap);
//RenderQuad(); // uncomment this line to see depth map
// Swap the buffers
glfwSwapBuffers(window);
}
glfwTerminate();
return 0;
}
void RenderScene(Shader &shader)
{
// Floor
glm::mat4 model;
glUniformMatrix4fv(glGetUniformLocation(shader.Program, "model"), 1, GL_FALSE, glm::value_ptr(model));
glBindVertexArray(planeVAO);
glDrawArrays(GL_TRIANGLES, 0, 6);
glBindVertexArray(0);
// Cubes
model = glm::mat4();
model = glm::translate(model, glm::vec3(0.0f, 1.5f, 0.0));
glUniformMatrix4fv(glGetUniformLocation(shader.Program, "model"), 1, GL_FALSE, glm::value_ptr(model));
RenderCube();
model = glm::mat4();
model = glm::translate(model, glm::vec3(2.0f, 0.0f, 1.0));
glUniformMatrix4fv(glGetUniformLocation(shader.Program, "model"), 1, GL_FALSE, glm::value_ptr(model));
RenderCube();
model = glm::mat4();
model = glm::translate(model, glm::vec3(-1.0f, 0.0f, 2.0));
model = glm::rotate(model, 60.0f, glm::normalize(glm::vec3(1.0, 0.0, 1.0)));
model = glm::scale(model, glm::vec3(0.5));
glUniformMatrix4fv(glGetUniformLocation(shader.Program, "model"), 1, GL_FALSE, glm::value_ptr(model));
RenderCube();
}
// RenderQuad() Renders a 1x1 quad in NDC, best used for framebuffer color targets
// and post-processing effects.
GLuint quadVAO = 0;
GLuint quadVBO;
void RenderQuad()
{
if (quadVAO == 0)
{
GLfloat quadVertices[] = {
// Positions // Texture Coords
-1.0f, 1.0f, 0.0f, 0.0f, 1.0f,
-1.0f, -1.0f, 0.0f, 0.0f, 0.0f,
1.0f, 1.0f, 0.0f, 1.0f, 1.0f,
1.0f, -1.0f, 0.0f, 1.0f, 0.0f,
};
// Setup plane VAO
glGenVertexArrays(1, &quadVAO);
glGenBuffers(1, &quadVBO);
glBindVertexArray(quadVAO);
glBindBuffer(GL_ARRAY_BUFFER, quadVBO);
glBufferData(GL_ARRAY_BUFFER, sizeof(quadVertices), &quadVertices, GL_STATIC_DRAW);
glEnableVertexAttribArray(0);
glVertexAttribPointer(0, 3, GL_FLOAT, GL_FALSE, 5 * sizeof(GLfloat), (GLvoid*)0);
glEnableVertexAttribArray(1);
glVertexAttribPointer(1, 2, GL_FLOAT, GL_FALSE, 5 * sizeof(GLfloat), (GLvoid*)(3 * sizeof(GLfloat)));
}
glBindVertexArray(quadVAO);
glDrawArrays(GL_TRIANGLE_STRIP, 0, 4);
glBindVertexArray(0);
}
// RenderCube() Renders a 1x1 3D cube in NDC.
GLuint cubeVAO = 0;
GLuint cubeVBO = 0;
void RenderCube()
{
// Initialize (if necessary)
if (cubeVAO == 0)
{
GLfloat vertices[] = {
// Back face
-0.5f, -0.5f, -0.5f, 0.0f, 0.0f, -1.0f, 0.0f, 0.0f, // Bottom-left
0.5f, 0.5f, -0.5f, 0.0f, 0.0f, -1.0f, 1.0f, 1.0f, // top-right
0.5f, -0.5f, -0.5f, 0.0f, 0.0f, -1.0f, 1.0f, 0.0f, // bottom-right
0.5f, 0.5f, -0.5f, 0.0f, 0.0f, -1.0f, 1.0f, 1.0f, // top-right
-0.5f, -0.5f, -0.5f, 0.0f, 0.0f, -1.0f, 0.0f, 0.0f, // bottom-left
-0.5f, 0.5f, -0.5f, 0.0f, 0.0f, -1.0f, 0.0f, 1.0f,// top-left
// Front face
-0.5f, -0.5f, 0.5f, 0.0f, 0.0f, 1.0f, 0.0f, 0.0f, // bottom-left
0.5f, -0.5f, 0.5f, 0.0f, 0.0f, 1.0f, 1.0f, 0.0f, // bottom-right
0.5f, 0.5f, 0.5f, 0.0f, 0.0f, 1.0f, 1.0f, 1.0f, // top-right
0.5f, 0.5f, 0.5f, 0.0f, 0.0f, 1.0f, 1.0f, 1.0f, // top-right
-0.5f, 0.5f, 0.5f, 0.0f, 0.0f, 1.0f, 0.0f, 1.0f, // top-left
-0.5f, -0.5f, 0.5f, 0.0f, 0.0f, 1.0f, 0.0f, 0.0f, // bottom-left
// Left face
-0.5f, 0.5f, 0.5f, -1.0f, 0.0f, 0.0f, 1.0f, 0.0f, // top-right
-0.5f, 0.5f, -0.5f, -1.0f, 0.0f, 0.0f, 1.0f, 1.0f, // top-left
-0.5f, -0.5f, -0.5f, -1.0f, 0.0f, 0.0f, 0.0f, 1.0f, // bottom-left
-0.5f, -0.5f, -0.5f, -1.0f, 0.0f, 0.0f, 0.0f, 1.0f, // bottom-left
-0.5f, -0.5f, 0.5f, -1.0f, 0.0f, 0.0f, 0.0f, 0.0f, // bottom-right
-0.5f, 0.5f, 0.5f, -1.0f, 0.0f, 0.0f, 1.0f, 0.0f, // top-right
// Right face
0.5f, 0.5f, 0.5f, 1.0f, 0.0f, 0.0f, 1.0f, 0.0f, // top-left
0.5f, -0.5f, -0.5f, 1.0f, 0.0f, 0.0f, 0.0f, 1.0f, // bottom-right
0.5f, 0.5f, -0.5f, 1.0f, 0.0f, 0.0f, 1.0f, 1.0f, // top-right
0.5f, -0.5f, -0.5f, 1.0f, 0.0f, 0.0f, 0.0f, 1.0f, // bottom-right
0.5f, 0.5f, 0.5f, 1.0f, 0.0f, 0.0f, 1.0f, 0.0f, // top-left
0.5f, -0.5f, 0.5f, 1.0f, 0.0f, 0.0f, 0.0f, 0.0f, // bottom-left
// Bottom face
-0.5f, -0.5f, -0.5f, 0.0f, -1.0f, 0.0f, 0.0f, 1.0f, // top-right
0.5f, -0.5f, -0.5f, 0.0f, -1.0f, 0.0f, 1.0f, 1.0f, // top-left
0.5f, -0.5f, 0.5f, 0.0f, -1.0f, 0.0f, 1.0f, 0.0f,// bottom-left
0.5f, -0.5f, 0.5f, 0.0f, -1.0f, 0.0f, 1.0f, 0.0f, // bottom-left
-0.5f, -0.5f, 0.5f, 0.0f, -1.0f, 0.0f, 0.0f, 0.0f, // bottom-right
-0.5f, -0.5f, -0.5f, 0.0f, -1.0f, 0.0f, 0.0f, 1.0f, // top-right
// Top face
-0.5f, 0.5f, -0.5f, 0.0f, 1.0f, 0.0f, 0.0f, 1.0f,// top-left
0.5f, 0.5f, 0.5f, 0.0f, 1.0f, 0.0f, 1.0f, 0.0f, // bottom-right
0.5f, 0.5f, -0.5f, 0.0f, 1.0f, 0.0f, 1.0f, 1.0f, // top-right
0.5f, 0.5f, 0.5f, 0.0f, 1.0f, 0.0f, 1.0f, 0.0f, // bottom-right
-0.5f, 0.5f, -0.5f, 0.0f, 1.0f, 0.0f, 0.0f, 1.0f,// top-left
-0.5f, 0.5f, 0.5f, 0.0f, 1.0f, 0.0f, 0.0f, 0.0f // bottom-left
};
glGenVertexArrays(1, &cubeVAO);
glGenBuffers(1, &cubeVBO);
// Fill buffer
glBindBuffer(GL_ARRAY_BUFFER, cubeVBO);
glBufferData(GL_ARRAY_BUFFER, sizeof(vertices), vertices, GL_STATIC_DRAW);
// Link vertex attributes
glBindVertexArray(cubeVAO);
glEnableVertexAttribArray(0);
glVertexAttribPointer(0, 3, GL_FLOAT, GL_FALSE, 8 * sizeof(GLfloat), (GLvoid*)0);
glEnableVertexAttribArray(1);
glVertexAttribPointer(1, 3, GL_FLOAT, GL_FALSE, 8 * sizeof(GLfloat), (GLvoid*)(3 * sizeof(GLfloat)));
glEnableVertexAttribArray(2);
glVertexAttribPointer(2, 2, GL_FLOAT, GL_FALSE, 8 * sizeof(GLfloat), (GLvoid*)(6 * sizeof(GLfloat)));
glBindBuffer(GL_ARRAY_BUFFER, 0);
glBindVertexArray(0);
}
// Render Cube
glBindVertexArray(cubeVAO);
glDrawArrays(GL_TRIANGLES, 0, 36);
glBindVertexArray(0);
}
// This function loads a texture from file. Note: texture loading functions like these are usually
// managed by a 'Resource Manager' that manages all resources (like textures, models, audio).
// For learning purposes we'll just define it as a utility function.
GLuint loadTexture(GLchar const * path)
{
// Generate texture ID and load texture data
GLuint textureID;
glGenTextures(1, &textureID);
int width, height;
unsigned char* image = SOIL_load_image(path, &width, &height, 0, SOIL_LOAD_RGB);
// Assign texture to ID
glBindTexture(GL_TEXTURE_2D, textureID);
glTexImage2D(GL_TEXTURE_2D, 0, GL_RGB, width, height, 0, GL_RGB, GL_UNSIGNED_BYTE, image);
glGenerateMipmap(GL_TEXTURE_2D);
// Parameters
glTexParameteri(GL_TEXTURE_2D, GL_TEXTURE_WRAP_S, GL_REPEAT);
glTexParameteri(GL_TEXTURE_2D, GL_TEXTURE_WRAP_T, GL_REPEAT);
glTexParameteri(GL_TEXTURE_2D, GL_TEXTURE_MIN_FILTER, GL_LINEAR_MIPMAP_LINEAR);
glTexParameteri(GL_TEXTURE_2D, GL_TEXTURE_MAG_FILTER, GL_LINEAR);
glBindTexture(GL_TEXTURE_2D, 0);
SOIL_free_image_data(image);
return textureID;
}
bool keys[1024];
bool keysPressed[1024];
// Moves/alters the camera positions based on user input
void Do_Movement()
{
// Camera controls
if (keys[GLFW_KEY_W])
camera.ProcessKeyboard(FORWARD, deltaTime);
if (keys[GLFW_KEY_S])
camera.ProcessKeyboard(BACKWARD, deltaTime);
if (keys[GLFW_KEY_A])
camera.ProcessKeyboard(LEFT, deltaTime);
if (keys[GLFW_KEY_D])
camera.ProcessKeyboard(RIGHT, deltaTime);
if (keys[GLFW_KEY_SPACE] && !keysPressed[GLFW_KEY_SPACE])
{
shadows = !shadows;
keysPressed[GLFW_KEY_SPACE] = true;
}
}
GLfloat lastX = 400, lastY = 300;
bool firstMouse = true;
// Is called whenever a key is pressed/released via GLFW
void key_callback(GLFWwindow* window, int key, int scancode, int action, int mode)
{
if (key == GLFW_KEY_ESCAPE && action == GLFW_PRESS)
glfwSetWindowShouldClose(window, GL_TRUE);
if (key >= 0 && key <= 1024)
{
if (action == GLFW_PRESS)
keys[key] = true;
else if (action == GLFW_RELEASE)
{
keys[key] = false;
keysPressed[key] = false;
}
}
}
void mouse_callback(GLFWwindow* window, double xpos, double ypos)
{
if (firstMouse)
{
lastX = xpos;
lastY = ypos;
firstMouse = false;
}
GLfloat xoffset = xpos - lastX;
GLfloat yoffset = lastY - ypos;
lastX = xpos;
lastY = ypos;
camera.ProcessMouseMovement(xoffset, yoffset);
}
void scroll_callback(GLFWwindow* window, double xoffset, double yoffset)
{
camera.ProcessMouseScroll(yoffset);
}

78
src/5.advanced_lighting/3.1.3.shadow_mapping/shadow_mapping.fs Normal file
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@@ -0,0 +1,78 @@
#version 330 core
out vec4 FragColor;
in VS_OUT {
vec3 FragPos;
vec3 Normal;
vec2 TexCoords;
vec4 FragPosLightSpace;
} fs_in;
uniform sampler2D diffuseTexture;
uniform sampler2D shadowMap;
uniform vec3 lightPos;
uniform vec3 viewPos;
uniform bool shadows;
float ShadowCalculation(vec4 fragPosLightSpace)
{
// perform perspective divide
vec3 projCoords = fragPosLightSpace.xyz / fragPosLightSpace.w;
// Transform to [0,1] range
projCoords = projCoords * 0.5 + 0.5;
// Get closest depth value from light's perspective (using [0,1] range fragPosLight as coords)
float closestDepth = texture(shadowMap, projCoords.xy).r;
// Get depth of current fragment from light's perspective
float currentDepth = projCoords.z;
// Calculate bias (based on depth map resolution and slope)
vec3 normal = normalize(fs_in.Normal);
vec3 lightDir = normalize(lightPos - fs_in.FragPos);
float bias = max(0.05 * (1.0 - dot(normal, lightDir)), 0.005);
// Check whether current frag pos is in shadow
// float shadow = currentDepth - bias > closestDepth ? 1.0 : 0.0;
// PCF
float shadow = 0.0;
vec2 texelSize = 1.0 / textureSize(shadowMap, 0);
for(int x = -1; x <= 1; ++x)
{
for(int y = -1; y <= 1; ++y)
{
float pcfDepth = texture(shadowMap, projCoords.xy + vec2(x, y) * texelSize).r;
shadow += currentDepth - bias > pcfDepth ? 1.0 : 0.0;
}
}
shadow /= 9.0;
// Keep the shadow at 0.0 when outside the far_plane region of the light's frustum.
if(projCoords.z > 1.0)
shadow = 0.0;
return shadow;
}
void main()
{
vec3 color = texture(diffuseTexture, fs_in.TexCoords).rgb;
vec3 normal = normalize(fs_in.Normal);
vec3 lightColor = vec3(0.3);
// Ambient
vec3 ambient = 0.3 * color;
// Diffuse
vec3 lightDir = normalize(lightPos - fs_in.FragPos);
float diff = max(dot(lightDir, normal), 0.0);
vec3 diffuse = diff * lightColor;
// Specular
vec3 viewDir = normalize(viewPos - fs_in.FragPos);
vec3 reflectDir = reflect(-lightDir, normal);
float spec = 0.0;
vec3 halfwayDir = normalize(lightDir + viewDir);
spec = pow(max(dot(normal, halfwayDir), 0.0), 64.0);
vec3 specular = spec * lightColor;
// Calculate shadow
float shadow = shadows ? ShadowCalculation(fs_in.FragPosLightSpace) : 0.0;
vec3 lighting = (ambient + (1.0 - shadow) * (diffuse + specular)) * color;
FragColor = vec4(lighting, 1.0f);
}

27
src/5.advanced_lighting/3.1.3.shadow_mapping/shadow_mapping.vs Normal file
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#version 330 core
layout (location = 0) in vec3 position;
layout (location = 1) in vec3 normal;
layout (location = 2) in vec2 texCoords;
out vec2 TexCoords;
out VS_OUT {
vec3 FragPos;
vec3 Normal;
vec2 TexCoords;
vec4 FragPosLightSpace;
} vs_out;
uniform mat4 projection;
uniform mat4 view;
uniform mat4 model;
uniform mat4 lightSpaceMatrix;
void main()
{
gl_Position = projection * view * model * vec4(position, 1.0f);
vs_out.FragPos = vec3(model * vec4(position, 1.0));
vs_out.Normal = transpose(inverse(mat3(model))) * normal;
vs_out.TexCoords = texCoords;
vs_out.FragPosLightSpace = lightSpaceMatrix * vec4(vs_out.FragPos, 1.0);
}

6
src/5.advanced_lighting/3.1.3.shadow_mapping/shadow_mapping_depth.fs Normal file
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#version 330 core
void main()
{
// gl_FragDepth = gl_FragCoord.z;
}

10
src/5.advanced_lighting/3.1.3.shadow_mapping/shadow_mapping_depth.vs Normal file
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@@ -0,0 +1,10 @@
#version 330 core
layout (location = 0) in vec3 position;
uniform mat4 lightSpaceMatrix;
uniform mat4 model;
void main()
{
gl_Position = lightSpaceMatrix * model * vec4(position, 1.0f);
}

0
src/5.advanced_lighting/3.2.point_shadows/point_shadows.cpp → src/5.advanced_lighting/3.2.1.point_shadows/point_shadows.cpp
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0
src/5.advanced_lighting/3.2.point_shadows/point_shadows.frag → src/5.advanced_lighting/3.2.1.point_shadows/point_shadows.frag
View File

0
src/5.advanced_lighting/3.2.point_shadows/point_shadows.vs → src/5.advanced_lighting/3.2.1.point_shadows/point_shadows.vs
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0
src/5.advanced_lighting/3.2.point_shadows/point_shadows_depth.frag → src/5.advanced_lighting/3.2.1.point_shadows/point_shadows_depth.frag
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0
src/5.advanced_lighting/3.2.point_shadows/point_shadows_depth.gs → src/5.advanced_lighting/3.2.1.point_shadows/point_shadows_depth.gs
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0
src/5.advanced_lighting/3.2.point_shadows/point_shadows_depth.vs → src/5.advanced_lighting/3.2.1.point_shadows/point_shadows_depth.vs
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106
src/5.advanced_lighting/3.2.2.point_shadows_soft/point_shadows.frag Normal file
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#version 330 core
out vec4 FragColor;
in VS_OUT {
vec3 FragPos;
vec3 Normal;
vec2 TexCoords;
} fs_in;
uniform sampler2D diffuseTexture;
uniform samplerCube depthMap;
uniform vec3 lightPos;
uniform vec3 viewPos;
uniform float far_plane;
uniform bool shadows;
// array of offset direction for sampling
vec3 gridSamplingDisk[20] = vec3[]
(
vec3(1, 1, 1), vec3(1, -1, 1), vec3(-1, -1, 1), vec3(-1, 1, 1),
vec3(1, 1, -1), vec3(1, -1, -1), vec3(-1, -1, -1), vec3(-1, 1, -1),
vec3(1, 1, 0), vec3(1, -1, 0), vec3(-1, -1, 0), vec3(-1, 1, 0),
vec3(1, 0, 1), vec3(-1, 0, 1), vec3(1, 0, -1), vec3(-1, 0, -1),
vec3(0, 1, 1), vec3(0, -1, 1), vec3(0, -1, -1), vec3(0, 1, -1)
);
float ShadowCalculation(vec3 fragPos)
{
// Get vector between fragment position and light position
vec3 fragToLight = fragPos - lightPos;
// Use the fragment to light vector to sample from the depth map
// float closestDepth = texture(depthMap, fragToLight).r;
// It is currently in linear range between [0,1]. Let's re-transform it back to original depth value
// closestDepth *= far_plane;
// Now get current linear depth as the length between the fragment and light position
float currentDepth = length(fragToLight);
// Now test for shadows
// float bias = 0.05; // We use a much larger bias since depth is now in [near_plane, far_plane] range
// float shadow = currentDepth - bias > closestDepth ? 1.0 : 0.0;
// PCF
// float shadow = 0.0;
// float bias = 0.05;
// float samples = 4.0;
// float offset = 0.1;
// for(float x = -offset; x < offset; x += offset / (samples * 0.5))
// {
// for(float y = -offset; y < offset; y += offset / (samples * 0.5))
// {
// for(float z = -offset; z < offset; z += offset / (samples * 0.5))
// {
// float closestDepth = texture(depthMap, fragToLight + vec3(x, y, z)).r; // Use lightdir to lookup cubemap
// closestDepth *= far_plane; // Undo mapping [0;1]
// if(currentDepth - bias > closestDepth)
// shadow += 1.0;
// }
// }
// }
// shadow /= (samples * samples * samples);
float shadow = 0.0;
float bias = 0.15;
int samples = 20;
float viewDistance = length(viewPos - fragPos);
float diskRadius = (1.0 + (viewDistance / far_plane)) / 25.0;
for(int i = 0; i < samples; ++i)
{
float closestDepth = texture(depthMap, fragToLight + gridSamplingDisk[i] * diskRadius).r;
closestDepth *= far_plane; // Undo mapping [0;1]
if(currentDepth - bias > closestDepth)
shadow += 1.0;
}
shadow /= float(samples);
// Display closestDepth as debug (to visualize depth cubemap)
// FragColor = vec4(vec3(closestDepth / far_plane), 1.0);
// return shadow;
return shadow;
}
void main()
{
vec3 color = texture(diffuseTexture, fs_in.TexCoords).rgb;
vec3 normal = normalize(fs_in.Normal);
vec3 lightColor = vec3(0.3);
// Ambient
vec3 ambient = 0.3 * color;
// Diffuse
vec3 lightDir = normalize(lightPos - fs_in.FragPos);
float diff = max(dot(lightDir, normal), 0.0);
vec3 diffuse = diff * lightColor;
// Specular
vec3 viewDir = normalize(viewPos - fs_in.FragPos);
vec3 reflectDir = reflect(-lightDir, normal);
float spec = 0.0;
vec3 halfwayDir = normalize(lightDir + viewDir);
spec = pow(max(dot(normal, halfwayDir), 0.0), 64.0);
vec3 specular = spec * lightColor;
// Calculate shadow
float shadow = shadows ? ShadowCalculation(fs_in.FragPos) : 0.0;
vec3 lighting = (ambient + (1.0 - shadow) * (diffuse + specular)) * color;
FragColor = vec4(lighting, 1.0f);
}

29
src/5.advanced_lighting/3.2.2.point_shadows_soft/point_shadows.vs Normal file
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#version 330 core
layout (location = 0) in vec3 position;
layout (location = 1) in vec3 normal;
layout (location = 2) in vec2 texCoords;
out vec2 TexCoords;
out VS_OUT {
vec3 FragPos;
vec3 Normal;
vec2 TexCoords;
} vs_out;
uniform mat4 projection;
uniform mat4 view;
uniform mat4 model;
uniform bool reverse_normals;
void main()
{
gl_Position = projection * view * model * vec4(position, 1.0f);
vs_out.FragPos = vec3(model * vec4(position, 1.0));
if(reverse_normals) // A slight hack to make sure the outer large cube displays lighting from the 'inside' instead of the default 'outside'.
vs_out.Normal = transpose(inverse(mat3(model))) * (-1.0 * normal);
else
vs_out.Normal = transpose(inverse(mat3(model))) * normal;
vs_out.TexCoords = texCoords;
}

16
src/5.advanced_lighting/3.2.2.point_shadows_soft/point_shadows_depth.frag Normal file
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#version 330 core
in vec4 FragPos;
uniform vec3 lightPos;
uniform float far_plane;
void main()
{
float lightDistance = length(FragPos.xyz - lightPos);
// map to [0;1] range by dividing by far_plane
lightDistance = lightDistance / far_plane;
// Write this as modified depth
gl_FragDepth = lightDistance;
}

22
src/5.advanced_lighting/3.2.2.point_shadows_soft/point_shadows_depth.gs Normal file
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#version 330 core
layout (triangles) in;
layout (triangle_strip, max_vertices=18) out;
uniform mat4 shadowTransforms[6];
out vec4 FragPos; // FragPos from GS (output per emitvertex)
void main()
{
for(int face = 0; face < 6; ++face)
{
gl_Layer = face; // built-in variable that specifies to which face we render.
for(int i = 0; i < 3; ++i) // for each triangle's vertices
{
FragPos = gl_in[i].gl_Position;
gl_Position = shadowTransforms[face] * FragPos;
EmitVertex();
}
EndPrimitive();
}
}

9
src/5.advanced_lighting/3.2.2.point_shadows_soft/point_shadows_depth.vs Normal file
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#version 330 core
layout (location = 0) in vec3 position;
uniform mat4 model;
void main()
{
gl_Position = model * vec4(position, 1.0);
}

390
src/5.advanced_lighting/3.2.2.point_shadows_soft/point_shadows_soft.cpp Normal file
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// GLEW
#define GLEW_STATIC
#include <GL/glew.h>
// GLFW
#include <GLFW/glfw3.h>
// GL includes
#include <learnopengl/shader.h>
#include <learnopengl/camera.h>
// GLM Mathemtics
#include <glm/glm.hpp>
#include <glm/gtc/matrix_transform.hpp>
#include <glm/gtc/type_ptr.hpp>
// Other Libs
#include <SOIL.h>
#include <learnopengl/filesystem.h>
// Properties
const GLuint SCR_WIDTH = 800, SCR_HEIGHT = 600;
// Function prototypes
void key_callback(GLFWwindow* window, int key, int scancode, int action, int mode);
void scroll_callback(GLFWwindow* window, double xoffset, double yoffset);
void mouse_callback(GLFWwindow* window, double xpos, double ypos);
void Do_Movement();
GLuint loadTexture(GLchar const * path);
void RenderScene(Shader &shader);
void RenderCube();
void RenderQuad();
// Camera
Camera camera(glm::vec3(0.0f, 0.0f, 3.0f));
// Delta
GLfloat deltaTime = 0.0f;
GLfloat lastFrame = 0.0f;
// Options
GLboolean shadows = true;
// Global variables
GLuint woodTexture;
GLuint planeVAO;
// The MAIN function, from here we start our application and run our Game loop
int main()
{
// Init GLFW
glfwInit();
glfwWindowHint(GLFW_CONTEXT_VERSION_MAJOR, 3);
glfwWindowHint(GLFW_CONTEXT_VERSION_MINOR, 3);
glfwWindowHint(GLFW_OPENGL_PROFILE, GLFW_OPENGL_CORE_PROFILE);
glfwWindowHint(GLFW_RESIZABLE, GL_FALSE);
GLFWwindow* window = glfwCreateWindow(SCR_WIDTH, SCR_HEIGHT, "LearnOpenGL", nullptr, nullptr); // Windowed
glfwMakeContextCurrent(window);
// Set the required callback functions
glfwSetKeyCallback(window, key_callback);
glfwSetCursorPosCallback(window, mouse_callback);
glfwSetScrollCallback(window, scroll_callback);
// Options
glfwSetInputMode(window, GLFW_CURSOR, GLFW_CURSOR_DISABLED);
// Initialize GLEW to setup the OpenGL Function pointers
glewExperimental = GL_TRUE;
glewInit();
// Define the viewport dimensions
glViewport(0, 0, SCR_WIDTH, SCR_HEIGHT);
// Setup some OpenGL options
glEnable(GL_DEPTH_TEST);
glEnable(GL_CULL_FACE);
// Setup and compile our shaders
Shader shader("point_shadows.vs", "point_shadows.frag");
Shader simpleDepthShader("point_shadows_depth.vs", "point_shadows_depth.frag", "point_shadows_depth.gs");
// Set texture samples
shader.Use();
glUniform1i(glGetUniformLocation(shader.Program, "diffuseTexture"), 0);
glUniform1i(glGetUniformLocation(shader.Program, "depthMap"), 1);
// Light source
glm::vec3 lightPos(0.0f, 0.0f, 0.0f);
// Load textures
woodTexture = loadTexture(FileSystem::getPath("resources/textures/wood.png").c_str());
// Configure depth map FBO
const GLuint SHADOW_WIDTH = 1024, SHADOW_HEIGHT = 1024;
GLuint depthMapFBO;
glGenFramebuffers(1, &depthMapFBO);
// Create depth cubemap texture
GLuint depthCubemap;
glGenTextures(1, &depthCubemap);
glBindTexture(GL_TEXTURE_CUBE_MAP, depthCubemap);
for (GLuint i = 0; i < 6; ++i)
glTexImage2D(GL_TEXTURE_CUBE_MAP_POSITIVE_X + i, 0, GL_DEPTH_COMPONENT, SHADOW_WIDTH, SHADOW_HEIGHT, 0, GL_DEPTH_COMPONENT, GL_FLOAT, NULL);
glTexParameteri(GL_TEXTURE_CUBE_MAP, GL_TEXTURE_MAG_FILTER, GL_NEAREST);
glTexParameteri(GL_TEXTURE_CUBE_MAP, GL_TEXTURE_MIN_FILTER, GL_NEAREST);
glTexParameteri(GL_TEXTURE_CUBE_MAP, GL_TEXTURE_WRAP_S, GL_CLAMP_TO_EDGE);
glTexParameteri(GL_TEXTURE_CUBE_MAP, GL_TEXTURE_WRAP_T, GL_CLAMP_TO_EDGE);
glTexParameteri(GL_TEXTURE_CUBE_MAP, GL_TEXTURE_WRAP_R, GL_CLAMP_TO_EDGE);
// Attach cubemap as depth map FBO's color buffer
glBindFramebuffer(GL_FRAMEBUFFER, depthMapFBO);
glFramebufferTexture(GL_FRAMEBUFFER, GL_DEPTH_ATTACHMENT, depthCubemap, 0);
glDrawBuffer(GL_NONE);
glReadBuffer(GL_NONE);
if (glCheckFramebufferStatus(GL_FRAMEBUFFER) != GL_FRAMEBUFFER_COMPLETE)
std::cout << "Framebuffer not complete!" << std::endl;
glBindFramebuffer(GL_FRAMEBUFFER, 0);
glClearColor(0.1f, 0.1f, 0.1f, 1.0f);
// Game loop
while (!glfwWindowShouldClose(window))
{
// Set frame time
GLfloat currentFrame = glfwGetTime();
deltaTime = currentFrame - lastFrame;
lastFrame = currentFrame;
// Check and call events
glfwPollEvents();
Do_Movement();
// Move light position over time
//lightPos.z = sin(glfwGetTime() * 0.5) * 3.0;
// 0. Create depth cubemap transformation matrices
GLfloat aspect = (GLfloat)SHADOW_WIDTH / (GLfloat)SHADOW_HEIGHT;
GLfloat near = 1.0f;
GLfloat far = 25.0f;
glm::mat4 shadowProj = glm::perspective(90.0f, aspect, near, far);
std::vector<glm::mat4> shadowTransforms;
shadowTransforms.push_back(shadowProj * glm::lookAt(lightPos, lightPos + glm::vec3( 1.0, 0.0, 0.0), glm::vec3(0.0, -1.0, 0.0)));
shadowTransforms.push_back(shadowProj * glm::lookAt(lightPos, lightPos + glm::vec3(-1.0, 0.0, 0.0), glm::vec3(0.0, -1.0, 0.0)));
shadowTransforms.push_back(shadowProj * glm::lookAt(lightPos, lightPos + glm::vec3( 0.0, 1.0, 0.0), glm::vec3(0.0, 0.0, 1.0)));
shadowTransforms.push_back(shadowProj * glm::lookAt(lightPos, lightPos + glm::vec3( 0.0, -1.0, 0.0), glm::vec3(0.0, 0.0, -1.0)));
shadowTransforms.push_back(shadowProj * glm::lookAt(lightPos, lightPos + glm::vec3( 0.0, 0.0, 1.0), glm::vec3(0.0, -1.0, 0.0)));
shadowTransforms.push_back(shadowProj * glm::lookAt(lightPos, lightPos + glm::vec3( 0.0, 0.0, -1.0), glm::vec3(0.0, -1.0, 0.0)));
// 1. Render scene to depth cubemap
glViewport(0, 0, SHADOW_WIDTH, SHADOW_HEIGHT);
glBindFramebuffer(GL_FRAMEBUFFER, depthMapFBO);
glClear(GL_DEPTH_BUFFER_BIT);
simpleDepthShader.Use();
for (GLuint i = 0; i < 6; ++i)
glUniformMatrix4fv(glGetUniformLocation(simpleDepthShader.Program, ("shadowTransforms[" + std::to_string(i) + "]").c_str()), 1, GL_FALSE, glm::value_ptr(shadowTransforms[i]));
glUniform1f(glGetUniformLocation(simpleDepthShader.Program, "far_plane"), far);
glUniform3fv(glGetUniformLocation(simpleDepthShader.Program, "lightPos"), 1, &lightPos[0]);
RenderScene(simpleDepthShader);
glBindFramebuffer(GL_FRAMEBUFFER, 0);
// 2. Render scene as normal
glViewport(0, 0, SCR_WIDTH, SCR_HEIGHT);
glClear(GL_COLOR_BUFFER_BIT | GL_DEPTH_BUFFER_BIT);
shader.Use();
glm::mat4 projection = glm::perspective(camera.Zoom, (float)SCR_WIDTH / (float)SCR_HEIGHT, 0.1f, 100.0f);
glm::mat4 view = camera.GetViewMatrix();
glUniformMatrix4fv(glGetUniformLocation(shader.Program, "projection"), 1, GL_FALSE, glm::value_ptr(projection));
glUniformMatrix4fv(glGetUniformLocation(shader.Program, "view"), 1, GL_FALSE, glm::value_ptr(view));
// Set light uniforms
glUniform3fv(glGetUniformLocation(shader.Program, "lightPos"), 1, &lightPos[0]);
glUniform3fv(glGetUniformLocation(shader.Program, "viewPos"), 1, &camera.Position[0]);
// Enable/Disable shadows by pressing 'SPACE'
glUniform1i(glGetUniformLocation(shader.Program, "shadows"), shadows);
glUniform1f(glGetUniformLocation(shader.Program, "far_plane"), far);
glActiveTexture(GL_TEXTURE0);
glBindTexture(GL_TEXTURE_2D, woodTexture);
glActiveTexture(GL_TEXTURE1);
glBindTexture(GL_TEXTURE_CUBE_MAP, depthCubemap);
RenderScene(shader);
// Swap the buffers
glfwSwapBuffers(window);
}
glfwTerminate();
return 0;
}
void RenderScene(Shader &shader)
{
// Room cube
glm::mat4 model;
model = glm::scale(model, glm::vec3(10.0));
glUniformMatrix4fv(glGetUniformLocation(shader.Program, "model"), 1, GL_FALSE, glm::value_ptr(model));
glDisable(GL_CULL_FACE); // Note that we disable culling here since we render 'inside' the cube instead of the usual 'outside' which throws off the normal culling methods.
glUniform1i(glGetUniformLocation(shader.Program, "reverse_normals"), 1); // A small little hack to invert normals when drawing cube from the inside so lighting still works.
RenderCube();
glUniform1i(glGetUniformLocation(shader.Program, "reverse_normals"), 0); // And of course disable it
glEnable(GL_CULL_FACE);
// Cubes
model = glm::mat4();
model = glm::translate(model, glm::vec3(4.0f, -3.5f, 0.0));
glUniformMatrix4fv(glGetUniformLocation(shader.Program, "model"), 1, GL_FALSE, glm::value_ptr(model));
RenderCube();
model = glm::mat4();
model = glm::translate(model, glm::vec3(2.0f, 3.0f, 1.0));
model = glm::scale(model, glm::vec3(1.5));
glUniformMatrix4fv(glGetUniformLocation(shader.Program, "model"), 1, GL_FALSE, glm::value_ptr(model));
RenderCube();
model = glm::mat4();
model = glm::translate(model, glm::vec3(-3.0f, -1.0f, 0.0));
glUniformMatrix4fv(glGetUniformLocation(shader.Program, "model"), 1, GL_FALSE, glm::value_ptr(model));
RenderCube();
model = glm::mat4();
model = glm::translate(model, glm::vec3(-1.5f, 1.0f, 1.5));
glUniformMatrix4fv(glGetUniformLocation(shader.Program, "model"), 1, GL_FALSE, glm::value_ptr(model));
RenderCube();
model = glm::mat4();
model = glm::translate(model, glm::vec3(-1.5f, 2.0f, -3.0));
model = glm::rotate(model, 60.0f, glm::normalize(glm::vec3(1.0, 0.0, 1.0)));
model = glm::scale(model, glm::vec3(1.5));
glUniformMatrix4fv(glGetUniformLocation(shader.Program, "model"), 1, GL_FALSE, glm::value_ptr(model));
RenderCube();
}
// RenderCube() Renders a 1x1 3D cube in NDC.
GLuint cubeVAO = 0;
GLuint cubeVBO = 0;
void RenderCube()
{
// Initialize (if necessary)
if (cubeVAO == 0)
{
GLfloat vertices[] = {
// Back face
-0.5f, -0.5f, -0.5f, 0.0f, 0.0f, -1.0f, 0.0f, 0.0f, // Bottom-left
0.5f, 0.5f, -0.5f, 0.0f, 0.0f, -1.0f, 1.0f, 1.0f, // top-right
0.5f, -0.5f, -0.5f, 0.0f, 0.0f, -1.0f, 1.0f, 0.0f, // bottom-right
0.5f, 0.5f, -0.5f, 0.0f, 0.0f, -1.0f, 1.0f, 1.0f, // top-right
-0.5f, -0.5f, -0.5f, 0.0f, 0.0f, -1.0f, 0.0f, 0.0f, // bottom-left
-0.5f, 0.5f, -0.5f, 0.0f, 0.0f, -1.0f, 0.0f, 1.0f,// top-left
// Front face
-0.5f, -0.5f, 0.5f, 0.0f, 0.0f, 1.0f, 0.0f, 0.0f, // bottom-left
0.5f, -0.5f, 0.5f, 0.0f, 0.0f, 1.0f, 1.0f, 0.0f, // bottom-right
0.5f, 0.5f, 0.5f, 0.0f, 0.0f, 1.0f, 1.0f, 1.0f, // top-right
0.5f, 0.5f, 0.5f, 0.0f, 0.0f, 1.0f, 1.0f, 1.0f, // top-right
-0.5f, 0.5f, 0.5f, 0.0f, 0.0f, 1.0f, 0.0f, 1.0f, // top-left
-0.5f, -0.5f, 0.5f, 0.0f, 0.0f, 1.0f, 0.0f, 0.0f, // bottom-left
// Left face
-0.5f, 0.5f, 0.5f, -1.0f, 0.0f, 0.0f, 1.0f, 0.0f, // top-right
-0.5f, 0.5f, -0.5f, -1.0f, 0.0f, 0.0f, 1.0f, 1.0f, // top-left
-0.5f, -0.5f, -0.5f, -1.0f, 0.0f, 0.0f, 0.0f, 1.0f, // bottom-left
-0.5f, -0.5f, -0.5f, -1.0f, 0.0f, 0.0f, 0.0f, 1.0f, // bottom-left
-0.5f, -0.5f, 0.5f, -1.0f, 0.0f, 0.0f, 0.0f, 0.0f, // bottom-right
-0.5f, 0.5f, 0.5f, -1.0f, 0.0f, 0.0f, 1.0f, 0.0f, // top-right
// Right face
0.5f, 0.5f, 0.5f, 1.0f, 0.0f, 0.0f, 1.0f, 0.0f, // top-left
0.5f, -0.5f, -0.5f, 1.0f, 0.0f, 0.0f, 0.0f, 1.0f, // bottom-right
0.5f, 0.5f, -0.5f, 1.0f, 0.0f, 0.0f, 1.0f, 1.0f, // top-right
0.5f, -0.5f, -0.5f, 1.0f, 0.0f, 0.0f, 0.0f, 1.0f, // bottom-right
0.5f, 0.5f, 0.5f, 1.0f, 0.0f, 0.0f, 1.0f, 0.0f, // top-left
0.5f, -0.5f, 0.5f, 1.0f, 0.0f, 0.0f, 0.0f, 0.0f, // bottom-left
// Bottom face
-0.5f, -0.5f, -0.5f, 0.0f, -1.0f, 0.0f, 0.0f, 1.0f, // top-right
0.5f, -0.5f, -0.5f, 0.0f, -1.0f, 0.0f, 1.0f, 1.0f, // top-left
0.5f, -0.5f, 0.5f, 0.0f, -1.0f, 0.0f, 1.0f, 0.0f,// bottom-left
0.5f, -0.5f, 0.5f, 0.0f, -1.0f, 0.0f, 1.0f, 0.0f, // bottom-left
-0.5f, -0.5f, 0.5f, 0.0f, -1.0f, 0.0f, 0.0f, 0.0f, // bottom-right
-0.5f, -0.5f, -0.5f, 0.0f, -1.0f, 0.0f, 0.0f, 1.0f, // top-right
// Top face
-0.5f, 0.5f, -0.5f, 0.0f, 1.0f, 0.0f, 0.0f, 1.0f,// top-left
0.5f, 0.5f, 0.5f, 0.0f, 1.0f, 0.0f, 1.0f, 0.0f, // bottom-right
0.5f, 0.5f, -0.5f, 0.0f, 1.0f, 0.0f, 1.0f, 1.0f, // top-right
0.5f, 0.5f, 0.5f, 0.0f, 1.0f, 0.0f, 1.0f, 0.0f, // bottom-right
-0.5f, 0.5f, -0.5f, 0.0f, 1.0f, 0.0f, 0.0f, 1.0f,// top-left
-0.5f, 0.5f, 0.5f, 0.0f, 1.0f, 0.0f, 0.0f, 0.0f // bottom-left
};
glGenVertexArrays(1, &cubeVAO);
glGenBuffers(1, &cubeVBO);
// Fill buffer
glBindBuffer(GL_ARRAY_BUFFER, cubeVBO);
glBufferData(GL_ARRAY_BUFFER, sizeof(vertices), vertices, GL_STATIC_DRAW);
// Link vertex attributes
glBindVertexArray(cubeVAO);
glEnableVertexAttribArray(0);
glVertexAttribPointer(0, 3, GL_FLOAT, GL_FALSE, 8 * sizeof(GLfloat), (GLvoid*)0);
glEnableVertexAttribArray(1);
glVertexAttribPointer(1, 3, GL_FLOAT, GL_FALSE, 8 * sizeof(GLfloat), (GLvoid*)(3 * sizeof(GLfloat)));
glEnableVertexAttribArray(2);
glVertexAttribPointer(2, 2, GL_FLOAT, GL_FALSE, 8 * sizeof(GLfloat), (GLvoid*)(6 * sizeof(GLfloat)));
glBindBuffer(GL_ARRAY_BUFFER, 0);
glBindVertexArray(0);
}
// Render Cube
glBindVertexArray(cubeVAO);
glDrawArrays(GL_TRIANGLES, 0, 36);
glBindVertexArray(0);
}
// This function loads a texture from file. Note: texture loading functions like these are usually
// managed by a 'Resource Manager' that manages all resources (like textures, models, audio).
// For learning purposes we'll just define it as a utility function.
GLuint loadTexture(GLchar const * path)
{
// Generate texture ID and load texture data
GLuint textureID;
glGenTextures(1, &textureID);
int width, height;
unsigned char* image = SOIL_load_image(path, &width, &height, 0, SOIL_LOAD_RGB);
// Assign texture to ID
glBindTexture(GL_TEXTURE_2D, textureID);
glTexImage2D(GL_TEXTURE_2D, 0, GL_RGB, width, height, 0, GL_RGB, GL_UNSIGNED_BYTE, image);
glGenerateMipmap(GL_TEXTURE_2D);
// Parameters
glTexParameteri(GL_TEXTURE_2D, GL_TEXTURE_WRAP_S, GL_REPEAT);
glTexParameteri(GL_TEXTURE_2D, GL_TEXTURE_WRAP_T, GL_REPEAT);
glTexParameteri(GL_TEXTURE_2D, GL_TEXTURE_MIN_FILTER, GL_LINEAR_MIPMAP_LINEAR);
glTexParameteri(GL_TEXTURE_2D, GL_TEXTURE_MAG_FILTER, GL_LINEAR);
glBindTexture(GL_TEXTURE_2D, 0);
SOIL_free_image_data(image);
return textureID;
}
bool keys[1024];
bool keysPressed[1024];
// Moves/alters the camera positions based on user input
void Do_Movement()
{
// Camera controls
if (keys[GLFW_KEY_W])
camera.ProcessKeyboard(FORWARD, deltaTime);
if (keys[GLFW_KEY_S])
camera.ProcessKeyboard(BACKWARD, deltaTime);
if (keys[GLFW_KEY_A])
camera.ProcessKeyboard(LEFT, deltaTime);
if (keys[GLFW_KEY_D])
camera.ProcessKeyboard(RIGHT, deltaTime);
if (keys[GLFW_KEY_SPACE] && !keysPressed[GLFW_KEY_SPACE])
{
shadows = !shadows;
keysPressed[GLFW_KEY_SPACE] = true;
}
}
GLfloat lastX = 400, lastY = 300;
bool firstMouse = true;
// Is called whenever a key is pressed/released via GLFW
void key_callback(GLFWwindow* window, int key, int scancode, int action, int mode)
{
if (key == GLFW_KEY_ESCAPE && action == GLFW_PRESS)
glfwSetWindowShouldClose(window, GL_TRUE);
if (key >= 0 && key <= 1024)
{
if (action == GLFW_PRESS)
keys[key] = true;
else if (action == GLFW_RELEASE)
{
keys[key] = false;
keysPressed[key] = false;
}
}
}
void mouse_callback(GLFWwindow* window, double xpos, double ypos)
{
if (firstMouse)
{
lastX = xpos;
lastY = ypos;
firstMouse = false;
}
GLfloat xoffset = xpos - lastX;
GLfloat yoffset = lastY - ypos;
lastX = xpos;
lastY = ypos;
camera.ProcessMouseMovement(xoffset, yoffset);
}
void scroll_callback(GLFWwindow* window, double xoffset, double yoffset)
{
camera.ProcessMouseScroll(yoffset);
}

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src/5.advanced_lighting/3.3.csm/csm.frag → src/5.advanced_lighting/3.3.csm/csm.fs
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src/5.advanced_lighting/4.normal_mapping/normal_mapping.frag → src/5.advanced_lighting/4.normal_mapping/4.normal_mapping.fs
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src/5.advanced_lighting/4.normal_mapping/normal_mapping.vs → src/5.advanced_lighting/4.normal_mapping/4.normal_mapping.vs
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src/5.advanced_lighting/5.parallax_mapping/parallax_mapping.frag → src/5.advanced_lighting/5.1.parallax_mapping/5.1.parallax_mapping.fs
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src/5.advanced_lighting/5.parallax_mapping/parallax_mapping.vs → src/5.advanced_lighting/5.1.parallax_mapping/5.1.parallax_mapping.vs
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src/5.advanced_lighting/5.parallax_mapping/parallax_mapping.cpp → src/5.advanced_lighting/5.1.parallax_mapping/parallax_mapping.cpp
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src/5.advanced_lighting/5.2.parallax_occlusion_mapping/5.2.parallax_mapping.fs Normal file
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#version 330 core
out vec4 FragColor;
in VS_OUT {
vec3 FragPos;
vec2 TexCoords;
vec3 TangentLightPos;
vec3 TangentViewPos;
vec3 TangentFragPos;
} fs_in;
uniform sampler2D diffuseMap;
uniform sampler2D normalMap;
uniform sampler2D depthMap;
uniform bool parallax;
uniform float height_scale;
vec2 ParallaxMapping(vec2 texCoords, vec3 viewDir)
{
// float height = texture(depthMap, texCoords).r;
// return texCoords - viewDir.xy * (height * height_scale);
// number of depth layers
const float minLayers = 8;
const float maxLayers = 32;
float numLayers = mix(maxLayers, minLayers, abs(dot(vec3(0.0, 0.0, 1.0), viewDir)));
// calculate the size of each layer
float layerDepth = 1.0 / numLayers;
// depth of current layer
float currentLayerDepth = 0.0;
// the amount to shift the texture coordinates per layer (from vector P)
vec2 P = viewDir.xy / viewDir.z * height_scale;
vec2 deltaTexCoords = P / numLayers;
// get initial values
vec2 currentTexCoords = texCoords;
float currentDepthMapValue = texture(depthMap, currentTexCoords).r;
while(currentLayerDepth < currentDepthMapValue)
{
// shift texture coordinates along direction of P
currentTexCoords -= deltaTexCoords;
// get depthmap value at current texture coordinates
currentDepthMapValue = texture(depthMap, currentTexCoords).r;
// get depth of next layer
currentLayerDepth += layerDepth;
}
// -- parallax occlusion mapping interpolation from here on
// get texture coordinates before collision (reverse operations)
vec2 prevTexCoords = currentTexCoords + deltaTexCoords;
// get depth after and before collision for linear interpolation
float afterDepth = currentDepthMapValue - currentLayerDepth;
float beforeDepth = texture(depthMap, prevTexCoords).r - currentLayerDepth + layerDepth;
// interpolation of texture coordinates
float weight = afterDepth / (afterDepth - beforeDepth);
vec2 finalTexCoords = prevTexCoords * weight + currentTexCoords * (1.0 - weight);
return finalTexCoords;
// return currentTexCoords;
}
void main()
{
// Offset texture coordinates with Parallax Mapping
vec3 viewDir = normalize(fs_in.TangentViewPos - fs_in.TangentFragPos);
vec2 texCoords = fs_in.TexCoords;
if(parallax)
texCoords = ParallaxMapping(fs_in.TexCoords, viewDir);
if(texCoords.x > 1.0 || texCoords.y > 1.0 || texCoords.x < 0.0 || texCoords.y < 0.0)
discard;
// Obtain normal from normal map
vec3 normal = texture(normalMap, texCoords).rgb;
normal = normalize(normal * 2.0 - 1.0);
// Get diffuse color
vec3 color = texture(diffuseMap, texCoords).rgb;
// Ambient
vec3 ambient = 0.1 * color;
// Diffuse
vec3 lightDir = normalize(fs_in.TangentLightPos - fs_in.TangentFragPos);
float diff = max(dot(lightDir, normal), 0.0);
vec3 diffuse = diff * color;
// Specular
vec3 reflectDir = reflect(-lightDir, normal);
vec3 halfwayDir = normalize(lightDir + viewDir);
float spec = pow(max(dot(normal, halfwayDir), 0.0), 32.0);
vec3 specular = vec3(0.2) * spec;
FragColor = vec4(ambient + diffuse + specular, 1.0f);
}

38
src/5.advanced_lighting/5.2.parallax_occlusion_mapping/5.2.parallax_mapping.vs Normal file
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#version 330 core
layout (location = 0) in vec3 position;
layout (location = 1) in vec3 normal;
layout (location = 2) in vec2 texCoords;
layout (location = 3) in vec3 tangent;
layout (location = 4) in vec3 bitangent;
out VS_OUT {
vec3 FragPos;
vec2 TexCoords;
vec3 TangentLightPos;
vec3 TangentViewPos;
vec3 TangentFragPos;
} vs_out;
uniform mat4 projection;
uniform mat4 view;
uniform mat4 model;
uniform vec3 lightPos;
uniform vec3 viewPos;
void main()
{
gl_Position = projection * view * model * vec4(position, 1.0f);
vs_out.FragPos = vec3(model * vec4(position, 1.0));
vs_out.TexCoords = texCoords;
vec3 T = normalize(mat3(model) * tangent);
vec3 B = normalize(mat3(model) * bitangent);
vec3 N = normalize(mat3(model) * normal);
mat3 TBN = transpose(mat3(T, B, N));
vs_out.TangentLightPos = TBN * lightPos;
vs_out.TangentViewPos = TBN * viewPos;
vs_out.TangentFragPos = TBN * vs_out.FragPos;
}

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src/5.advanced_lighting/5.2.parallax_occlusion_mapping/parallax_occlusion_mapping.cpp Normal file
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// Std. Includes
#include <string>
// GLEW
#define GLEW_STATIC
#include <GL/glew.h>
// GLFW
#include <GLFW/glfw3.h>
// GL includes
#include <learnopengl/shader.h>
#include <learnopengl/camera.h>
#include <learnopengl/model.h>
// GLM Mathemtics
#include <glm/glm.hpp>
#include <glm/gtc/matrix_transform.hpp>
#include <glm/gtc/type_ptr.hpp>
// Other Libs
#include <SOIL.h>
#include <learnopengl/filesystem.h>
// Properties
const GLuint SCR_WIDTH = 800, SCR_HEIGHT = 600;
// Function prototypes
void key_callback(GLFWwindow* window, int key, int scancode, int action, int mode);
void scroll_callback(GLFWwindow* window, double xoffset, double yoffset);
void mouse_callback(GLFWwindow* window, double xpos, double ypos);
void Do_Movement();
GLuint loadTexture(GLchar const * path);
void RenderQuad();
// Camera
Camera camera(glm::vec3(0.0f, 0.0f, 3.0f));
GLfloat deltaTime = 0.0f;
GLfloat lastFrame = 0.0f;
GLboolean parallax_mapping = true;
GLfloat height_scale = 0.1;
// The MAIN function, from here we start our application and run our Game loop
int main()
{
// Init GLFW
glfwInit();
glfwWindowHint(GLFW_CONTEXT_VERSION_MAJOR, 3);
glfwWindowHint(GLFW_CONTEXT_VERSION_MINOR, 3);
glfwWindowHint(GLFW_OPENGL_PROFILE, GLFW_OPENGL_CORE_PROFILE);
glfwWindowHint(GLFW_RESIZABLE, GL_FALSE);
GLFWwindow* window = glfwCreateWindow(SCR_WIDTH, SCR_HEIGHT, "LearnOpenGL", nullptr, nullptr); // Windowed
glfwMakeContextCurrent(window);
// Set the required callback functions
glfwSetKeyCallback(window, key_callback);
glfwSetCursorPosCallback(window, mouse_callback);
glfwSetScrollCallback(window, scroll_callback);
// Options
glfwSetInputMode(window, GLFW_CURSOR, GLFW_CURSOR_DISABLED);
// Initialize GLEW to setup the OpenGL Function pointers
glewExperimental = GL_TRUE;
glewInit();
// Define the viewport dimensions
glViewport(0, 0, SCR_WIDTH, SCR_HEIGHT);
// Setup some OpenGL options
glEnable(GL_DEPTH_TEST);
// Setup and compile our shaders
Shader shader("parallax_mapping.vs", "parallax_mapping.frag");
// Load textures
GLuint diffuseMap = loadTexture(FileSystem::getPath("resources/textures/bricks2.jpg").c_str());
GLuint normalMap = loadTexture(FileSystem::getPath("resources/textures/bricks2_normal.jpg").c_str());
GLuint heightMap = loadTexture(FileSystem::getPath("resources/textures/bricks2_disp.jpg").c_str());
//GLuint diffuseMap = loadTexture(FileSystem::getPath("resources/textures/wood.png").c_str();
//GLuint normalMap = loadTexture(FileSystem::getPath("resources/textures/toy_box_normal.png").c_str());
//GLuint heightMap = loadTexture(FileSystem::getPath("resources/textures/toy_box_disp.png").c_str());
// Set texture units
shader.Use();
glUniform1i(glGetUniformLocation(shader.Program, "diffuseMap"), 0);
glUniform1i(glGetUniformLocation(shader.Program, "normalMap"), 1);
glUniform1i(glGetUniformLocation(shader.Program, "depthMap"), 2);
// Light position
glm::vec3 lightPos(0.5f, 1.0f, 0.3f);
// Game loop
while (!glfwWindowShouldClose(window))
{
// Set frame time
GLfloat currentFrame = glfwGetTime();
deltaTime = currentFrame - lastFrame;
lastFrame = currentFrame;
// Check and call events
glfwPollEvents();
Do_Movement();
// Clear the colorbuffer
glClearColor(0.1f, 0.1f, 0.1f, 1.0f);
glClear(GL_COLOR_BUFFER_BIT | GL_DEPTH_BUFFER_BIT);
// Configure view/projection matrices
shader.Use();
glm::mat4 view = camera.GetViewMatrix();
glm::mat4 projection = glm::perspective(camera.Zoom, (GLfloat)SCR_WIDTH / (GLfloat)SCR_HEIGHT, 0.1f, 100.0f);
glUniformMatrix4fv(glGetUniformLocation(shader.Program, "view"), 1, GL_FALSE, glm::value_ptr(view));
glUniformMatrix4fv(glGetUniformLocation(shader.Program, "projection"), 1, GL_FALSE, glm::value_ptr(projection));
// Render normal-mapped quad
glm::mat4 model;
//model = glm::rotate(model, (GLfloat)glfwGetTime() * -10, glm::normalize(glm::vec3(1.0, 0.0, 1.0))); // Rotates the quad to show parallax mapping works in all directions
glUniformMatrix4fv(glGetUniformLocation(shader.Program, "model"), 1, GL_FALSE, glm::value_ptr(model));
glUniform3fv(glGetUniformLocation(shader.Program, "lightPos"), 1, &lightPos[0]);
glUniform3fv(glGetUniformLocation(shader.Program, "viewPos"), 1, &camera.Position[0]);
glUniform1f(glGetUniformLocation(shader.Program, "height_scale"), height_scale);
glUniform1i(glGetUniformLocation(shader.Program, "parallax"), parallax_mapping);
glActiveTexture(GL_TEXTURE0);
glBindTexture(GL_TEXTURE_2D, diffuseMap);
glActiveTexture(GL_TEXTURE1);
glBindTexture(GL_TEXTURE_2D, normalMap);
glActiveTexture(GL_TEXTURE2);
glBindTexture(GL_TEXTURE_2D, heightMap);
RenderQuad();
// render light source (simply renders a smaller plane at the light's position for debugging/visualization)
model = glm::mat4();
model = glm::translate(model, lightPos);
model = glm::scale(model, glm::vec3(0.1f));
glUniformMatrix4fv(glGetUniformLocation(shader.Program, "model"), 1, GL_FALSE, glm::value_ptr(model));
//RenderQuad();
// Swap the buffers
glfwSwapBuffers(window);
}
glfwTerminate();
return 0;
}
// RenderQuad() Renders a 1x1 quad in NDC
GLuint quadVAO = 0;
GLuint quadVBO;
void RenderQuad()
{
if (quadVAO == 0)
{
// positions
glm::vec3 pos1(-1.0, 1.0, 0.0);
glm::vec3 pos2(-1.0, -1.0, 0.0);
glm::vec3 pos3(1.0, -1.0, 0.0);
glm::vec3 pos4(1.0, 1.0, 0.0);
// texture coordinates
glm::vec2 uv1(0.0, 1.0);
glm::vec2 uv2(0.0, 0.0);
glm::vec2 uv3(1.0, 0.0);
glm::vec2 uv4(1.0, 1.0);
// normal vector
glm::vec3 nm(0.0, 0.0, 1.0);
// calculate tangent/bitangent vectors of both triangles
glm::vec3 tangent1, bitangent1;
glm::vec3 tangent2, bitangent2;
// - triangle 1
glm::vec3 edge1 = pos2 - pos1;
glm::vec3 edge2 = pos3 - pos1;
glm::vec2 deltaUV1 = uv2 - uv1;
glm::vec2 deltaUV2 = uv3 - uv1;
GLfloat f = 1.0f / (deltaUV1.x * deltaUV2.y - deltaUV2.x * deltaUV1.y);
tangent1.x = f * (deltaUV2.y * edge1.x - deltaUV1.y * edge2.x);
tangent1.y = f * (deltaUV2.y * edge1.y - deltaUV1.y * edge2.y);
tangent1.z = f * (deltaUV2.y * edge1.z - deltaUV1.y * edge2.z);
tangent1 = glm::normalize(tangent1);
bitangent1.x = f * (-deltaUV2.x * edge1.x + deltaUV1.x * edge2.x);
bitangent1.y = f * (-deltaUV2.x * edge1.y + deltaUV1.x * edge2.y);
bitangent1.z = f * (-deltaUV2.x * edge1.z + deltaUV1.x * edge2.z);
bitangent1 = glm::normalize(bitangent1);
// - triangle 2
edge1 = pos3 - pos1;
edge2 = pos4 - pos1;
deltaUV1 = uv3 - uv1;
deltaUV2 = uv4 - uv1;
f = 1.0f / (deltaUV1.x * deltaUV2.y - deltaUV2.x * deltaUV1.y);
tangent2.x = f * (deltaUV2.y * edge1.x - deltaUV1.y * edge2.x);
tangent2.y = f * (deltaUV2.y * edge1.y - deltaUV1.y * edge2.y);
tangent2.z = f * (deltaUV2.y * edge1.z - deltaUV1.y * edge2.z);
tangent2 = glm::normalize(tangent2);
bitangent2.x = f * (-deltaUV2.x * edge1.x + deltaUV1.x * edge2.x);
bitangent2.y = f * (-deltaUV2.x * edge1.y + deltaUV1.x * edge2.y);
bitangent2.z = f * (-deltaUV2.x * edge1.z + deltaUV1.x * edge2.z);
bitangent2 = glm::normalize(bitangent2);
GLfloat quadVertices[] = {
// Positions // normal // TexCoords // Tangent // Bitangent
pos1.x, pos1.y, pos1.z, nm.x, nm.y, nm.z, uv1.x, uv1.y, tangent1.x, tangent1.y, tangent1.z, bitangent1.x, bitangent1.y, bitangent1.z,
pos2.x, pos2.y, pos2.z, nm.x, nm.y, nm.z, uv2.x, uv2.y, tangent1.x, tangent1.y, tangent1.z, bitangent1.x, bitangent1.y, bitangent1.z,
pos3.x, pos3.y, pos3.z, nm.x, nm.y, nm.z, uv3.x, uv3.y, tangent1.x, tangent1.y, tangent1.z, bitangent1.x, bitangent1.y, bitangent1.z,
pos1.x, pos1.y, pos1.z, nm.x, nm.y, nm.z, uv1.x, uv1.y, tangent2.x, tangent2.y, tangent2.z, bitangent2.x, bitangent2.y, bitangent2.z,
pos3.x, pos3.y, pos3.z, nm.x, nm.y, nm.z, uv3.x, uv3.y, tangent2.x, tangent2.y, tangent2.z, bitangent2.x, bitangent2.y, bitangent2.z,
pos4.x, pos4.y, pos4.z, nm.x, nm.y, nm.z, uv4.x, uv4.y, tangent2.x, tangent2.y, tangent2.z, bitangent2.x, bitangent2.y, bitangent2.z
};
// Setup plane VAO
glGenVertexArrays(1, &quadVAO);
glGenBuffers(1, &quadVBO);
glBindVertexArray(quadVAO);
glBindBuffer(GL_ARRAY_BUFFER, quadVBO);
glBufferData(GL_ARRAY_BUFFER, sizeof(quadVertices), &quadVertices, GL_STATIC_DRAW);
glEnableVertexAttribArray(0);
glVertexAttribPointer(0, 3, GL_FLOAT, GL_FALSE, 14 * sizeof(GLfloat), (GLvoid*)0);
glEnableVertexAttribArray(1);
glVertexAttribPointer(1, 3, GL_FLOAT, GL_FALSE, 14 * sizeof(GLfloat), (GLvoid*)(3 * sizeof(GLfloat)));
glEnableVertexAttribArray(2);
glVertexAttribPointer(2, 2, GL_FLOAT, GL_FALSE, 14 * sizeof(GLfloat), (GLvoid*)(6 * sizeof(GLfloat)));
glEnableVertexAttribArray(3);
glVertexAttribPointer(3, 3, GL_FLOAT, GL_FALSE, 14 * sizeof(GLfloat), (GLvoid*)(8 * sizeof(GLfloat)));
glEnableVertexAttribArray(4);
glVertexAttribPointer(4, 3, GL_FLOAT, GL_FALSE, 14 * sizeof(GLfloat), (GLvoid*)(11 * sizeof(GLfloat)));
}
glBindVertexArray(quadVAO);
glDrawArrays(GL_TRIANGLES, 0, 6);
glBindVertexArray(0);
}
// This function loads a texture from file. Note: texture loading functions like these are usually
// managed by a 'Resource Manager' that manages all resources (like textures, models, audio).
// For learning purposes we'll just define it as a utility function.
GLuint loadTexture(GLchar const * path)
{
//Generate texture ID and load texture data
GLuint textureID;
glGenTextures(1, &textureID);
int width, height;
unsigned char* image = SOIL_load_image(path, &width, &height, 0, SOIL_LOAD_RGB);
// Assign texture to ID
glBindTexture(GL_TEXTURE_2D, textureID);
glTexImage2D(GL_TEXTURE_2D, 0, GL_RGB, width, height, 0, GL_RGB, GL_UNSIGNED_BYTE, image);
glGenerateMipmap(GL_TEXTURE_2D);
// Parameters
glTexParameteri(GL_TEXTURE_2D, GL_TEXTURE_WRAP_S, GL_REPEAT);
glTexParameteri(GL_TEXTURE_2D, GL_TEXTURE_WRAP_T, GL_REPEAT);
glTexParameteri(GL_TEXTURE_2D, GL_TEXTURE_MIN_FILTER, GL_LINEAR_MIPMAP_LINEAR);
glTexParameteri(GL_TEXTURE_2D, GL_TEXTURE_MAG_FILTER, GL_LINEAR);
glBindTexture(GL_TEXTURE_2D, 0);
SOIL_free_image_data(image);
return textureID;
}
#pragma region "User input"
bool keys[1024];
bool keysPressed[1024];
// Moves/alters the camera positions based on user input
void Do_Movement()
{
// Camera controls
if (keys[GLFW_KEY_W])
camera.ProcessKeyboard(FORWARD, deltaTime);
if (keys[GLFW_KEY_S])
camera.ProcessKeyboard(BACKWARD, deltaTime);
if (keys[GLFW_KEY_A])
camera.ProcessKeyboard(LEFT, deltaTime);
if (keys[GLFW_KEY_D])
camera.ProcessKeyboard(RIGHT, deltaTime);
// Change parallax height scale
if (keys[GLFW_KEY_Q])
height_scale -= 0.05 * deltaTime;
else if (keys[GLFW_KEY_E])
height_scale += 0.05 * deltaTime;
// Enable/disable parallax mapping
if (keys[GLFW_KEY_SPACE] && !keysPressed[GLFW_KEY_SPACE])
{
parallax_mapping = !parallax_mapping;
keysPressed[GLFW_KEY_SPACE] = true;
}
}
// Is called whenever a key is pressed/released via GLFW
void key_callback(GLFWwindow* window, int key, int scancode, int action, int mode)
{
if (key == GLFW_KEY_ESCAPE && action == GLFW_PRESS)
glfwSetWindowShouldClose(window, GL_TRUE);
if (key >= 0 && key <= 1024)
{
if (action == GLFW_PRESS)
keys[key] = true;
else if (action == GLFW_RELEASE)
{
keys[key] = false;
keysPressed[key] = false;
}
}
}
GLfloat lastX = 400, lastY = 300;
bool firstMouse = true;
// Moves/alters the camera positions based on user input
void mouse_callback(GLFWwindow* window, double xpos, double ypos)
{
if (firstMouse)
{
lastX = xpos;
lastY = ypos;
firstMouse = false;
}
GLfloat xoffset = xpos - lastX;
GLfloat yoffset = lastY - ypos;
lastX = xpos;
lastY = ypos;
camera.ProcessMouseMovement(xoffset, yoffset);
}
void scroll_callback(GLFWwindow* window, double xoffset, double yoffset)
{
camera.ProcessMouseScroll(yoffset);
}
#pragma endregion

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src/5.advanced_lighting/6.hdr/hdr.frag → src/5.advanced_lighting/6.hdr/6.hdr.fs
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src/5.advanced_lighting/7.bloom/blur.vs → src/5.advanced_lighting/6.hdr/6.hdr.vs
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src/5.advanced_lighting/6.hdr/lighting.frag → src/5.advanced_lighting/6.hdr/6.lighting.fs
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src/5.advanced_lighting/6.hdr/lighting.vs → src/5.advanced_lighting/6.hdr/6.lighting.vs
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src/5.advanced_lighting/7.bloom/bloom.frag → src/5.advanced_lighting/7.bloom/7.bloom.fs
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src/5.advanced_lighting/7.bloom/bloom.vs → src/5.advanced_lighting/7.bloom/7.bloom.vs
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src/5.advanced_lighting/7.bloom/bloom_final.frag → src/5.advanced_lighting/7.bloom/7.bloom_final.fs
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src/5.advanced_lighting/8.deferred_shading/deferred_shading.vs → src/5.advanced_lighting/7.bloom/7.bloom_final.vs
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src/5.advanced_lighting/7.bloom/blur.frag → src/5.advanced_lighting/7.bloom/7.blur.fs
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src/5.advanced_lighting/9.ssao/ssao.vs → src/5.advanced_lighting/7.bloom/7.blur.vs
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src/5.advanced_lighting/7.bloom/light_box.frag → src/5.advanced_lighting/7.bloom/7.light_box.fs
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src/5.advanced_lighting/8.deferred_shading/deferred_light_box.vs → src/5.advanced_lighting/8.1.deferred_shading/8.1.deferred_light_box.vs
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src/5.advanced_lighting/8.deferred_shading/deferred_shading.frag → src/5.advanced_lighting/8.1.deferred_shading/8.1.deferred_shading.fs
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src/5.advanced_lighting/8.1.deferred_shading/8.1.deferred_shading.vs Normal file
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#version 330 core
layout (location = 0) in vec3 position;
layout (location = 1) in vec2 texCoords;
out vec2 TexCoords;
void main()
{
gl_Position = vec4(position, 1.0f);
TexCoords = texCoords;
}

0
src/5.advanced_lighting/8.deferred_shading/fbo_debug.frag → src/5.advanced_lighting/8.1.deferred_shading/8.1.fbo_debug.fs
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0
src/5.advanced_lighting/8.deferred_shading/fbo_debug.vs → src/5.advanced_lighting/8.1.deferred_shading/8.1.fbo_debug.vs
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0
src/5.advanced_lighting/8.deferred_shading/g_buffer.frag → src/5.advanced_lighting/8.1.deferred_shading/8.1.g_buffer.fs
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src/5.advanced_lighting/8.deferred_shading/g_buffer.vs → src/5.advanced_lighting/8.1.deferred_shading/8.1.g_buffer.vs
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src/5.advanced_lighting/8.deferred_shading/deferred_shading.cpp → src/5.advanced_lighting/8.1.deferred_shading/deferred_shading.cpp
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66
src/5.advanced_lighting/8.2.deferred_shading_volumes/8.2.deferred_shading.fs Normal file
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#version 330 core
out vec4 FragColor;
in vec2 TexCoords;
uniform sampler2D gPosition;
uniform sampler2D gNormal;
uniform sampler2D gAlbedoSpec;
struct Light {
vec3 Position;
vec3 Color;
float Linear;
float Quadratic;
float Radius;
};
const int NR_LIGHTS = 32;
uniform Light lights[NR_LIGHTS];
uniform vec3 viewPos;
uniform int draw_mode;
void main()
{
// Retrieve data from gbuffer
vec3 FragPos = texture(gPosition, TexCoords).rgb;
vec3 Normal = texture(gNormal, TexCoords).rgb;
vec3 Diffuse = texture(gAlbedoSpec, TexCoords).rgb;
float Specular = texture(gAlbedoSpec, TexCoords).a;
// Then calculate lighting as usual
vec3 lighting = Diffuse * 0.1; // hard-coded ambient component
vec3 viewDir = normalize(viewPos - FragPos);
for(int i = 0; i < NR_LIGHTS; ++i)
{
// Calculate distance between light source and current fragment
float distance = length(lights[i].Position - FragPos);
if(distance < lights[i].Radius)
{
// Diffuse
vec3 lightDir = normalize(lights[i].Position - FragPos);
vec3 diffuse = max(dot(Normal, lightDir), 0.0) * Diffuse * lights[i].Color;
// Specular
vec3 halfwayDir = normalize(lightDir + viewDir);
float spec = pow(max(dot(Normal, halfwayDir), 0.0), 16.0);
vec3 specular = lights[i].Color * spec * Specular;
// Attenuation
float attenuation = 1.0 / (1.0 + lights[i].Linear * distance + lights[i].Quadratic * distance * distance);
diffuse *= attenuation;
specular *= attenuation;
lighting += diffuse + specular;
}
}
// Based on which of the 1-5 keys we pressed, show final result or intermediate g-buffer textures
if(draw_mode == 1)
FragColor = vec4(lighting, 1.0);
else if(draw_mode == 2)
FragColor = vec4(FragPos, 1.0);
else if(draw_mode == 3)
FragColor = vec4(Normal, 1.0);
else if(draw_mode == 4)
FragColor = vec4(Diffuse, 1.0);
else if(draw_mode == 5)
FragColor = vec4(vec3(Specular), 1.0);
}

11
src/5.advanced_lighting/8.2.deferred_shading_volumes/8.2.deferred_shading.vs Normal file
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#version 330 core
layout (location = 0) in vec3 position;
layout (location = 1) in vec2 texCoords;
out vec2 TexCoords;
void main()
{
gl_Position = vec4(position, 1.0f);
TexCoords = texCoords;
}

441
src/5.advanced_lighting/8.2.deferred_shading_volumes/deferred_shading_volumes.cpp Normal file
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// GLEW
#define GLEW_STATIC
#include <GL/glew.h>
// GLFW
#include <GLFW/glfw3.h>
// GL includes
#include <learnopengl/shader.h>
#include <learnopengl/camera.h>
#include <learnopengl/model.h>
// GLM Mathemtics
#include <glm/glm.hpp>
#include <glm/gtc/matrix_transform.hpp>
#include <glm/gtc/type_ptr.hpp>
// Other Libs
#include <SOIL.h>
#include <learnopengl/filesystem.h>
// Properties
const GLuint SCR_WIDTH = 800, SCR_HEIGHT = 600;
// Function prototypes
void key_callback(GLFWwindow* window, int key, int scancode, int action, int mode);
void scroll_callback(GLFWwindow* window, double xoffset, double yoffset);
void mouse_callback(GLFWwindow* window, double xpos, double ypos);
void Do_Movement();
GLuint loadTexture(GLchar const * path);
void RenderCube();
void RenderQuad();
// Camera
Camera camera(glm::vec3(0.0f, 0.0f, 5.0f));
// Delta
GLfloat deltaTime = 0.0f;
GLfloat lastFrame = 0.0f;
// Options
GLuint draw_mode = 1;
GLboolean wireframe = false;
// The MAIN function, from here we start our application and run our Game loop
int main()
{
// Init GLFW
glfwInit();
glfwWindowHint(GLFW_CONTEXT_VERSION_MAJOR, 3);
glfwWindowHint(GLFW_CONTEXT_VERSION_MINOR, 3);
glfwWindowHint(GLFW_OPENGL_PROFILE, GLFW_OPENGL_CORE_PROFILE);
glfwWindowHint(GLFW_RESIZABLE, GL_FALSE);
GLFWwindow* window = glfwCreateWindow(SCR_WIDTH, SCR_HEIGHT, "LearnOpenGL", nullptr, nullptr); // Windowed
glfwMakeContextCurrent(window);
// Set the required callback functions
glfwSetKeyCallback(window, key_callback);
glfwSetCursorPosCallback(window, mouse_callback);
glfwSetScrollCallback(window, scroll_callback);
// Options
glfwSetInputMode(window, GLFW_CURSOR, GLFW_CURSOR_DISABLED);
// Initialize GLEW to setup the OpenGL Function pointers
glewExperimental = GL_TRUE;
glewInit();
// Define the viewport dimensions
glViewport(0, 0, SCR_WIDTH, SCR_HEIGHT);
// Setup some OpenGL options
glEnable(GL_DEPTH_TEST);
// Setup and compile our shaders
Shader shaderGeometryPass("g_buffer.vs", "g_buffer.frag");
Shader shaderLightingPass("deferred_shading.vs", "deferred_shading.frag");
Shader shaderLightBox("deferred_light_box.vs", "deferred_light_box.frag");
// Set samplers
shaderLightingPass.Use();
glUniform1i(glGetUniformLocation(shaderLightingPass.Program, "gPosition"), 0);
glUniform1i(glGetUniformLocation(shaderLightingPass.Program, "gNormal"), 1);
glUniform1i(glGetUniformLocation(shaderLightingPass.Program, "gAlbedoSpec"), 2);
// Models
Model cyborg(FileSystem::getPath("resources/objects/nanosuit/nanosuit.obj").c_str());
std::vector<glm::vec3> objectPositions;
objectPositions.push_back(glm::vec3(-3.0, -3.0, -3.0));
objectPositions.push_back(glm::vec3(0.0, -3.0, -3.0));
objectPositions.push_back(glm::vec3(3.0, -3.0, -3.0));
objectPositions.push_back(glm::vec3(-3.0, -3.0, 0.0));
objectPositions.push_back(glm::vec3(0.0, -3.0, 0.0));
objectPositions.push_back(glm::vec3(3.0, -3.0, 0.0));
objectPositions.push_back(glm::vec3(-3.0, -3.0, 3.0));
objectPositions.push_back(glm::vec3(0.0, -3.0, 3.0));
objectPositions.push_back(glm::vec3(3.0, -3.0, 3.0));
// - Colors
const GLuint NR_LIGHTS = 32;
std::vector<glm::vec3> lightPositions;
std::vector<glm::vec3> lightColors;
srand(13);
for (GLuint i = 0; i < NR_LIGHTS; i++)
{
// Calculate slightly random offsets
GLfloat xPos = ((rand() % 100) / 100.0) * 6.0 - 3.0;
GLfloat yPos = ((rand() % 100) / 100.0) * 6.0 - 4.0;
GLfloat zPos = ((rand() % 100) / 100.0) * 6.0 - 3.0;
lightPositions.push_back(glm::vec3(xPos, yPos, zPos));
// Also calculate random color
GLfloat rColor = ((rand() % 100) / 200.0f) + 0.5; // Between 0.5 and 1.0
GLfloat gColor = ((rand() % 100) / 200.0f) + 0.5; // Between 0.5 and 1.0
GLfloat bColor = ((rand() % 100) / 200.0f) + 0.5; // Between 0.5 and 1.0
lightColors.push_back(glm::vec3(rColor, gColor, bColor));
}
// Set up G-Buffer
// 3 textures:
// 1. Positions (RGB)
// 2. Color (RGB) + Specular (A)
// 3. Normals (RGB)
GLuint gBuffer;
glGenFramebuffers(1, &gBuffer);
glBindFramebuffer(GL_FRAMEBUFFER, gBuffer);
GLuint gPosition, gNormal, gAlbedoSpec;
// - Position color buffer
glGenTextures(1, &gPosition);
glBindTexture(GL_TEXTURE_2D, gPosition);
glTexImage2D(GL_TEXTURE_2D, 0, GL_RGB16F, SCR_WIDTH, SCR_HEIGHT, 0, GL_RGB, GL_FLOAT, NULL);
glTexParameteri(GL_TEXTURE_2D, GL_TEXTURE_MIN_FILTER, GL_NEAREST);
glTexParameteri(GL_TEXTURE_2D, GL_TEXTURE_MAG_FILTER, GL_NEAREST);
glFramebufferTexture2D(GL_FRAMEBUFFER, GL_COLOR_ATTACHMENT0, GL_TEXTURE_2D, gPosition, 0);
// - Normal color buffer
glGenTextures(1, &gNormal);
glBindTexture(GL_TEXTURE_2D, gNormal);
glTexImage2D(GL_TEXTURE_2D, 0, GL_RGB16F, SCR_WIDTH, SCR_HEIGHT, 0, GL_RGB, GL_FLOAT, NULL);
glTexParameteri(GL_TEXTURE_2D, GL_TEXTURE_MIN_FILTER, GL_NEAREST);
glTexParameteri(GL_TEXTURE_2D, GL_TEXTURE_MAG_FILTER, GL_NEAREST);
glFramebufferTexture2D(GL_FRAMEBUFFER, GL_COLOR_ATTACHMENT1, GL_TEXTURE_2D, gNormal, 0);
// - Color + Specular color buffer
glGenTextures(1, &gAlbedoSpec);
glBindTexture(GL_TEXTURE_2D, gAlbedoSpec);
glTexImage2D(GL_TEXTURE_2D, 0, GL_RGBA, SCR_WIDTH, SCR_HEIGHT, 0, GL_RGBA, GL_UNSIGNED_BYTE, NULL);
glTexParameteri(GL_TEXTURE_2D, GL_TEXTURE_MIN_FILTER, GL_NEAREST);
glTexParameteri(GL_TEXTURE_2D, GL_TEXTURE_MAG_FILTER, GL_NEAREST);
glFramebufferTexture2D(GL_FRAMEBUFFER, GL_COLOR_ATTACHMENT2, GL_TEXTURE_2D, gAlbedoSpec, 0);
// - Tell OpenGL which color attachments we'll use (of this framebuffer) for rendering
GLuint attachments[3] = { GL_COLOR_ATTACHMENT0, GL_COLOR_ATTACHMENT1, GL_COLOR_ATTACHMENT2 };
glDrawBuffers(3, attachments);
// - Create and attach depth buffer (renderbuffer)
GLuint rboDepth;
glGenRenderbuffers(1, &rboDepth);
glBindRenderbuffer(GL_RENDERBUFFER, rboDepth);
glRenderbufferStorage(GL_RENDERBUFFER, GL_DEPTH_COMPONENT, SCR_WIDTH, SCR_HEIGHT);
glFramebufferRenderbuffer(GL_FRAMEBUFFER, GL_DEPTH_ATTACHMENT, GL_RENDERBUFFER, rboDepth);
// - Finally check if framebuffer is complete
if (glCheckFramebufferStatus(GL_FRAMEBUFFER) != GL_FRAMEBUFFER_COMPLETE)
std::cout << "Framebuffer not complete!" << std::endl;
glBindFramebuffer(GL_FRAMEBUFFER, 0);
glClearColor(0.0f, 0.0f, 0.0f, 0.0f);
// Game loop
while (!glfwWindowShouldClose(window))
{
// Set frame time
GLfloat currentFrame = glfwGetTime();
deltaTime = currentFrame - lastFrame;
lastFrame = currentFrame;
// Check and call events
glfwPollEvents();
Do_Movement();
glPolygonMode(GL_FRONT_AND_BACK, wireframe ? GL_LINE : GL_FILL);
// 1. Geometry Pass: render scene's geometry/color data into gbuffer
glBindFramebuffer(GL_FRAMEBUFFER, gBuffer);
glClear(GL_COLOR_BUFFER_BIT | GL_DEPTH_BUFFER_BIT);
glm::mat4 projection = glm::perspective(camera.Zoom, (GLfloat)SCR_WIDTH / (GLfloat)SCR_HEIGHT, 0.1f, 100.0f);
glm::mat4 view = camera.GetViewMatrix();
glm::mat4 model;
shaderGeometryPass.Use();
glUniformMatrix4fv(glGetUniformLocation(shaderGeometryPass.Program, "projection"), 1, GL_FALSE, glm::value_ptr(projection));
glUniformMatrix4fv(glGetUniformLocation(shaderGeometryPass.Program, "view"), 1, GL_FALSE, glm::value_ptr(view));
for (GLuint i = 0; i < objectPositions.size(); i++)
{
model = glm::mat4();
model = glm::translate(model, objectPositions[i]);
model = glm::scale(model, glm::vec3(0.25f));
glUniformMatrix4fv(glGetUniformLocation(shaderGeometryPass.Program, "model"), 1, GL_FALSE, glm::value_ptr(model));
cyborg.Draw(shaderGeometryPass);
}
glBindFramebuffer(GL_FRAMEBUFFER, 0);
glPolygonMode(GL_FRONT_AND_BACK, GL_FILL);
// 2. Lighting Pass: calculate lighting by iterating over a screen filled quad pixel-by-pixel using the gbuffer's content.
glClear(GL_COLOR_BUFFER_BIT | GL_DEPTH_BUFFER_BIT);
shaderLightingPass.Use();
glActiveTexture(GL_TEXTURE0);
glBindTexture(GL_TEXTURE_2D, gPosition);
glActiveTexture(GL_TEXTURE1);
glBindTexture(GL_TEXTURE_2D, gNormal);
glActiveTexture(GL_TEXTURE2);
glBindTexture(GL_TEXTURE_2D, gAlbedoSpec);
// Also send light relevant uniforms
for (GLuint i = 0; i < lightPositions.size(); i++)
{
glUniform3fv(glGetUniformLocation(shaderLightingPass.Program, ("lights[" + std::to_string(i) + "].Position").c_str()), 1, &lightPositions[i][0]);
glUniform3fv(glGetUniformLocation(shaderLightingPass.Program, ("lights[" + std::to_string(i) + "].Color").c_str()), 1, &lightColors[i][0]);
// Update attenuation parameters and calculate radius
const GLfloat constant = 1.0; // Note that we don't send this to the shader, we assume it is always 1.0 (in our case)
const GLfloat linear = 0.7;
const GLfloat quadratic = 1.8;
glUniform1f(glGetUniformLocation(shaderLightingPass.Program, ("lights[" + std::to_string(i) + "].Linear").c_str()), linear);
glUniform1f(glGetUniformLocation(shaderLightingPass.Program, ("lights[" + std::to_string(i) + "].Quadratic").c_str()), quadratic);
// Then calculate radius of light volume/sphere
const GLfloat lightThreshold = 5.0; // 5 / 256
const GLfloat maxBrightness = std::fmaxf(std::fmaxf(lightColors[i].r, lightColors[i].g), lightColors[i].b);
GLfloat radius = (-linear + static_cast<float>(std::sqrt(linear * linear - 4 * quadratic * (constant - (256.0 / lightThreshold) * maxBrightness)))) / (2 * quadratic);
glUniform1f(glGetUniformLocation(shaderLightingPass.Program, ("lights[" + std::to_string(i) + "].Radius").c_str()), radius);
}
glUniform3fv(glGetUniformLocation(shaderLightingPass.Program, "viewPos"), 1, &camera.Position[0]);
glUniform1i(glGetUniformLocation(shaderLightingPass.Program, "draw_mode"), draw_mode);
RenderQuad();
// 2.5. Copy content of geometry's depth buffer to default framebuffer's depth buffer
glBindFramebuffer(GL_READ_FRAMEBUFFER, gBuffer);
glBindFramebuffer(GL_DRAW_FRAMEBUFFER, 0); // Write to default framebuffer
// blit to default framebuffer. Note that this may or may not work as the internal formats of both the FBO and default framebuffer have to match.
// the internal formats are implementation defined. This works on all of my systems, but if it doesn't on yours you'll likely have to write to the
// depth buffer in another stage (or somehow see to match the default framebuffer's internal format with the FBO's internal format).
glBlitFramebuffer(0, 0, SCR_WIDTH, SCR_HEIGHT, 0, 0, SCR_WIDTH, SCR_HEIGHT, GL_DEPTH_BUFFER_BIT, GL_NEAREST);
glBindFramebuffer(GL_FRAMEBUFFER, 0);
// 3. Render lights on top of scene, by blitting
shaderLightBox.Use();
glUniformMatrix4fv(glGetUniformLocation(shaderLightBox.Program, "projection"), 1, GL_FALSE, glm::value_ptr(projection));
glUniformMatrix4fv(glGetUniformLocation(shaderLightBox.Program, "view"), 1, GL_FALSE, glm::value_ptr(view));
for (GLuint i = 0; i < lightPositions.size(); i++)
{
model = glm::mat4();
model = glm::translate(model, lightPositions[i]);
model = glm::scale(model, glm::vec3(0.25f));
glUniformMatrix4fv(glGetUniformLocation(shaderLightBox.Program, "model"), 1, GL_FALSE, glm::value_ptr(model));
glUniform3fv(glGetUniformLocation(shaderLightBox.Program, "lightColor"), 1, &lightColors[i][0]);
RenderCube();
}
// Swap the buffers
glfwSwapBuffers(window);
}
glfwTerminate();
return 0;
}
// RenderQuad() Renders a 1x1 quad in NDC, best used for framebuffer color targets
// and post-processing effects.
GLuint quadVAO = 0;
GLuint quadVBO;
void RenderQuad()
{
if (quadVAO == 0)
{
GLfloat quadVertices[] = {
// Positions // Texture Coords
-1.0f, 1.0f, 0.0f, 0.0f, 1.0f,
-1.0f, -1.0f, 0.0f, 0.0f, 0.0f,
1.0f, 1.0f, 0.0f, 1.0f, 1.0f,
1.0f, -1.0f, 0.0f, 1.0f, 0.0f,
};
// Setup plane VAO
glGenVertexArrays(1, &quadVAO);
glGenBuffers(1, &quadVBO);
glBindVertexArray(quadVAO);
glBindBuffer(GL_ARRAY_BUFFER, quadVBO);
glBufferData(GL_ARRAY_BUFFER, sizeof(quadVertices), &quadVertices, GL_STATIC_DRAW);
glEnableVertexAttribArray(0);
glVertexAttribPointer(0, 3, GL_FLOAT, GL_FALSE, 5 * sizeof(GLfloat), (GLvoid*)0);
glEnableVertexAttribArray(1);
glVertexAttribPointer(1, 2, GL_FLOAT, GL_FALSE, 5 * sizeof(GLfloat), (GLvoid*)(3 * sizeof(GLfloat)));
}
glBindVertexArray(quadVAO);
glDrawArrays(GL_TRIANGLE_STRIP, 0, 4);
glBindVertexArray(0);
}
// RenderCube() Renders a 1x1 3D cube in NDC.
GLuint cubeVAO = 0;
GLuint cubeVBO = 0;
void RenderCube()
{
// Initialize (if necessary)
if (cubeVAO == 0)
{
GLfloat vertices[] = {
// Back face
-0.5f, -0.5f, -0.5f, 0.0f, 0.0f, -1.0f, 0.0f, 0.0f, // Bottom-left
0.5f, 0.5f, -0.5f, 0.0f, 0.0f, -1.0f, 1.0f, 1.0f, // top-right
0.5f, -0.5f, -0.5f, 0.0f, 0.0f, -1.0f, 1.0f, 0.0f, // bottom-right
0.5f, 0.5f, -0.5f, 0.0f, 0.0f, -1.0f, 1.0f, 1.0f, // top-right
-0.5f, -0.5f, -0.5f, 0.0f, 0.0f, -1.0f, 0.0f, 0.0f, // bottom-left
-0.5f, 0.5f, -0.5f, 0.0f, 0.0f, -1.0f, 0.0f, 1.0f,// top-left
// Front face
-0.5f, -0.5f, 0.5f, 0.0f, 0.0f, 1.0f, 0.0f, 0.0f, // bottom-left
0.5f, -0.5f, 0.5f, 0.0f, 0.0f, 1.0f, 1.0f, 0.0f, // bottom-right
0.5f, 0.5f, 0.5f, 0.0f, 0.0f, 1.0f, 1.0f, 1.0f, // top-right
0.5f, 0.5f, 0.5f, 0.0f, 0.0f, 1.0f, 1.0f, 1.0f, // top-right
-0.5f, 0.5f, 0.5f, 0.0f, 0.0f, 1.0f, 0.0f, 1.0f, // top-left
-0.5f, -0.5f, 0.5f, 0.0f, 0.0f, 1.0f, 0.0f, 0.0f, // bottom-left
// Left face
-0.5f, 0.5f, 0.5f, -1.0f, 0.0f, 0.0f, 1.0f, 0.0f, // top-right
-0.5f, 0.5f, -0.5f, -1.0f, 0.0f, 0.0f, 1.0f, 1.0f, // top-left
-0.5f, -0.5f, -0.5f, -1.0f, 0.0f, 0.0f, 0.0f, 1.0f, // bottom-left
-0.5f, -0.5f, -0.5f, -1.0f, 0.0f, 0.0f, 0.0f, 1.0f, // bottom-left
-0.5f, -0.5f, 0.5f, -1.0f, 0.0f, 0.0f, 0.0f, 0.0f, // bottom-right
-0.5f, 0.5f, 0.5f, -1.0f, 0.0f, 0.0f, 1.0f, 0.0f, // top-right
// Right face
0.5f, 0.5f, 0.5f, 1.0f, 0.0f, 0.0f, 1.0f, 0.0f, // top-left
0.5f, -0.5f, -0.5f, 1.0f, 0.0f, 0.0f, 0.0f, 1.0f, // bottom-right
0.5f, 0.5f, -0.5f, 1.0f, 0.0f, 0.0f, 1.0f, 1.0f, // top-right
0.5f, -0.5f, -0.5f, 1.0f, 0.0f, 0.0f, 0.0f, 1.0f, // bottom-right
0.5f, 0.5f, 0.5f, 1.0f, 0.0f, 0.0f, 1.0f, 0.0f, // top-left
0.5f, -0.5f, 0.5f, 1.0f, 0.0f, 0.0f, 0.0f, 0.0f, // bottom-left
// Bottom face
-0.5f, -0.5f, -0.5f, 0.0f, -1.0f, 0.0f, 0.0f, 1.0f, // top-right
0.5f, -0.5f, -0.5f, 0.0f, -1.0f, 0.0f, 1.0f, 1.0f, // top-left
0.5f, -0.5f, 0.5f, 0.0f, -1.0f, 0.0f, 1.0f, 0.0f,// bottom-left
0.5f, -0.5f, 0.5f, 0.0f, -1.0f, 0.0f, 1.0f, 0.0f, // bottom-left
-0.5f, -0.5f, 0.5f, 0.0f, -1.0f, 0.0f, 0.0f, 0.0f, // bottom-right
-0.5f, -0.5f, -0.5f, 0.0f, -1.0f, 0.0f, 0.0f, 1.0f, // top-right
// Top face
-0.5f, 0.5f, -0.5f, 0.0f, 1.0f, 0.0f, 0.0f, 1.0f,// top-left
0.5f, 0.5f, 0.5f, 0.0f, 1.0f, 0.0f, 1.0f, 0.0f, // bottom-right
0.5f, 0.5f, -0.5f, 0.0f, 1.0f, 0.0f, 1.0f, 1.0f, // top-right
0.5f, 0.5f, 0.5f, 0.0f, 1.0f, 0.0f, 1.0f, 0.0f, // bottom-right
-0.5f, 0.5f, -0.5f, 0.0f, 1.0f, 0.0f, 0.0f, 1.0f,// top-left
-0.5f, 0.5f, 0.5f, 0.0f, 1.0f, 0.0f, 0.0f, 0.0f // bottom-left
};
glGenVertexArrays(1, &cubeVAO);
glGenBuffers(1, &cubeVBO);
// Fill buffer
glBindBuffer(GL_ARRAY_BUFFER, cubeVBO);
glBufferData(GL_ARRAY_BUFFER, sizeof(vertices), vertices, GL_STATIC_DRAW);
// Link vertex attributes
glBindVertexArray(cubeVAO);
glEnableVertexAttribArray(0);
glVertexAttribPointer(0, 3, GL_FLOAT, GL_FALSE, 8 * sizeof(GLfloat), (GLvoid*)0);
glEnableVertexAttribArray(1);
glVertexAttribPointer(1, 3, GL_FLOAT, GL_FALSE, 8 * sizeof(GLfloat), (GLvoid*)(3 * sizeof(GLfloat)));
glEnableVertexAttribArray(2);
glVertexAttribPointer(2, 2, GL_FLOAT, GL_FALSE, 8 * sizeof(GLfloat), (GLvoid*)(6 * sizeof(GLfloat)));
glBindBuffer(GL_ARRAY_BUFFER, 0);
glBindVertexArray(0);
}
// Render Cube
glBindVertexArray(cubeVAO);
glDrawArrays(GL_TRIANGLES, 0, 36);
glBindVertexArray(0);
}
bool keys[1024];
bool keysPressed[1024];
// Moves/alters the camera positions based on user input
void Do_Movement()
{
// Camera controls
if (keys[GLFW_KEY_W])
camera.ProcessKeyboard(FORWARD, deltaTime);
if (keys[GLFW_KEY_S])
camera.ProcessKeyboard(BACKWARD, deltaTime);
if (keys[GLFW_KEY_A])
camera.ProcessKeyboard(LEFT, deltaTime);
if (keys[GLFW_KEY_D])
camera.ProcessKeyboard(RIGHT, deltaTime);
if (keys[GLFW_KEY_1])
draw_mode = 1;
if (keys[GLFW_KEY_2])
draw_mode = 2;
if (keys[GLFW_KEY_3])
draw_mode = 3;
if (keys[GLFW_KEY_4])
draw_mode = 4;
if (keys[GLFW_KEY_5])
draw_mode = 5;
if (keys[GLFW_KEY_Z] && !keysPressed[GLFW_KEY_Z])
{
wireframe = !wireframe;
keysPressed[GLFW_KEY_Z] = true;
}
}
GLfloat lastX = 400, lastY = 300;
bool firstMouse = true;
// Is called whenever a key is pressed/released via GLFW
void key_callback(GLFWwindow* window, int key, int scancode, int action, int mode)
{
if (key == GLFW_KEY_ESCAPE && action == GLFW_PRESS)
glfwSetWindowShouldClose(window, GL_TRUE);
if (key >= 0 && key <= 1024)
{
if (action == GLFW_PRESS)
keys[key] = true;
else if (action == GLFW_RELEASE)
{
keys[key] = false;
keysPressed[key] = false;
}
}
}
void mouse_callback(GLFWwindow* window, double xpos, double ypos)
{
if (firstMouse)
{
lastX = xpos;
lastY = ypos;
firstMouse = false;
}
GLfloat xoffset = xpos - lastX;
GLfloat yoffset = lastY - ypos;
lastX = xpos;
lastY = ypos;
camera.ProcessMouseMovement(xoffset, yoffset);
}
void scroll_callback(GLFWwindow* window, double xoffset, double yoffset)
{
camera.ProcessMouseScroll(yoffset);
}

0
src/5.advanced_lighting/9.ssao/ssao.frag → src/5.advanced_lighting/9.ssao/9.ssao.fs
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11
src/5.advanced_lighting/9.ssao/9.ssao.vs Normal file
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@@ -0,0 +1,11 @@
#version 330 core
layout (location = 0) in vec3 position;
layout (location = 1) in vec2 texCoords;
out vec2 TexCoords;
void main()
{
gl_Position = vec4(position, 1.0f);
TexCoords = texCoords;
}

0
src/5.advanced_lighting/9.ssao/ssao_blur.frag → src/5.advanced_lighting/9.ssao/9.ssao_blur.fs
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0
src/5.advanced_lighting/9.ssao/ssao_geometry.frag → src/5.advanced_lighting/9.ssao/9.ssao_geometry.fs
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0
src/5.advanced_lighting/9.ssao/ssao_geometry.vs → src/5.advanced_lighting/9.ssao/9.ssao_geometry.vs
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0
src/5.advanced_lighting/9.ssao/ssao_lighting.frag → src/5.advanced_lighting/9.ssao/9.ssao_lighting.fs
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123
src/6.pbr/1.1.lighting/1.1.pbr.fs Normal file
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@@ -0,0 +1,123 @@
#version 330 core
out vec4 FragColor;
in vec2 TexCoords;
in vec3 WorldPos;
in vec3 Normal;
in mat3 TBN;
// material parameters
uniform vec3 albedo;
uniform float metallic;
uniform float roughness;
uniform float ao;
// lights
uniform vec3 lightPositions[4];
uniform vec3 lightColors[4];
uniform vec3 camPos;
uniform float exposure;
const float PI = 3.14159265359;
// ----------------------------------------------------------------------------
float DistributionGGX(vec3 N, vec3 H, float roughness)
{
float a = roughness*roughness;
float a2 = a*a;
float NdotH = max(dot(N, H), 0.0);
float NdotH2 = NdotH*NdotH;
float nom = a2;
float denom = (NdotH2 * (a2 - 1.0) + 1.0);
denom = PI * denom * denom;
return nom / denom;
}
// ----------------------------------------------------------------------------
float GeometrySchlickGGX(float NdotV, float roughness)
{
float r = (roughness + 1.0);
float k = (r*r) / 8.0;
float nom = NdotV;
float denom = NdotV * (1.0 - k) + k;
return nom / denom;
}
// ----------------------------------------------------------------------------
float GeometrySmith(vec3 N, vec3 V, vec3 L, float roughness)
{
float NdotV = max(dot(N, V), 0.0);
float NdotL = max(dot(N, L), 0.0);
float ggx2 = GeometrySchlickGGX(NdotV, roughness);
float ggx1 = GeometrySchlickGGX(NdotL, roughness);
return ggx1 * ggx2;
}
// ----------------------------------------------------------------------------
vec3 fresnelSchlick(float cosTheta, vec3 F0)
{
return F0 + (1.0 - F0) * pow(1.0 - cosTheta, 5.0);
}
// ----------------------------------------------------------------------------
void main()
{
vec3 N = normalize(Normal);
vec3 V = normalize(camPos - WorldPos);
// calculate reflectance at normal incidence; if dia-electric (like plastic) use F0
// of 0.04 and if it's a metal, use their albedo color as F0 (metallic workflow)
vec3 F0 = vec3(0.04);
F0 = mix(F0, albedo, metallic);
// reflectance equation
vec3 Lo = vec3(0.0);
for(int i = 0; i < 4; ++i)
{
// calculate per-light radiance
vec3 L = normalize(lightPositions[i] - WorldPos);
vec3 H = normalize(V + L);
float distance = length(lightPositions[i] - WorldPos);
float attenuation = 1.0 / (distance * distance);
vec3 radiance = lightColors[i] * attenuation;
// Cook-Torrance BRDF
float NDF = DistributionGGX(N, H, roughness);
float G = GeometrySmith(N, V, L, roughness);
vec3 F = fresnelSchlick(max(dot(H, V), 0.0), F0);
vec3 nominator = NDF * G * F;
float denominator = 4 * max(dot(N, V), 0.0) * max(dot(N, L), 0.0) + 0.001; // 0.001 to prevent divide by zero.
vec3 specular = nominator / denominator;
// kS is equal to Fresnel
vec3 kS = F;
// for energy conservation, the diffuse and specular light can't
// be above 1.0 (unless the surface emits light); to preserve this
// relationship the diffuse component (kD) should equal 1.0 - kS.
vec3 kD = vec3(1.0) - kS;
// multiply kD by the inverse metalness such that only non-metals
// have diffuse lighting, or a linear blend if partly metal (pure metals
// have no diffuse light).
kD *= 1.0 - metallic;
// scale light by NdotL
float NdotL = max(dot(N, L), 0.0);
// add to outgoing radiance Lo
Lo += (kD * albedo / PI + specular) * radiance * NdotL; // note that we already multiplied the BRDF by the Fresnel (kS) so we won't multiply by kS again
}
// ambient lighting (note that the next IBL tutorial will replace
// this ambient lighting with environment lighting).
vec3 ambient = vec3(0.03) * albedo * ao;
vec3 color = ambient + Lo;
// HDR tonemapping
color = color / (color + vec3(1.0));
// gamma correct
color = pow(color, vec3(1.0/2.2));
FragColor = vec4(color, 1.0);
}

0
src/6.pbr/1.1.lighting/pbr.vs → src/6.pbr/1.1.lighting/1.1.pbr.vs
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150
src/6.pbr/1.2.lighting_textured/1.2.pbr.fs Normal file
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@@ -0,0 +1,150 @@
#version 330 core
out vec4 FragColor;
in vec2 TexCoords;
in vec3 WorldPos;
in vec3 Normal;
in mat3 TBN;
// material parameters
uniform sampler2D albedoMap;
uniform sampler2D normalMap;
uniform sampler2D metallicMap;
uniform sampler2D roughnessMap;
uniform sampler2D aoMap;
// lights
uniform vec3 lightPositions[4];
uniform vec3 lightColors[4];
uniform vec3 camPos;
uniform float exposure;
const float PI = 3.14159265359;
// ----------------------------------------------------------------------------
// Easy trick to get tangent-normals to world-space to keep PBR code simplified.
// Don't worry if you don't get what's going on; you generally want to do normal
// mapping the usual way for performance anways; I do plan make a note of this
// technique somewhere later in the normal mapping tutorial.
vec3 getNormalFromMap()
{
vec3 tangentNormal = texture(normalMap, TexCoords).xyz * 2.0 - 1.0;
vec3 Q1 = dFdx(WorldPos);
vec3 Q2 = dFdy(WorldPos);
vec2 st1 = dFdx(TexCoords);
vec2 st2 = dFdy(TexCoords);
vec3 N = normalize(Normal);
vec3 T = normalize(Q1*st2.t - Q2*st1.t);
vec3 B = -normalize(cross(N, T));
mat3 TBN = mat3(T, B, N);
return normalize(TBN * tangentNormal);
}
// ----------------------------------------------------------------------------
float DistributionGGX(vec3 N, vec3 H, float roughness)
{
float a = roughness*roughness;
float a2 = a*a;
float NdotH = max(dot(N, H), 0.0);
float NdotH2 = NdotH*NdotH;
float nom = a2;
float denom = (NdotH2 * (a2 - 1.0) + 1.0);
denom = PI * denom * denom;
return nom / denom;
}
// ----------------------------------------------------------------------------
float GeometrySchlickGGX(float NdotV, float roughness)
{
float r = (roughness + 1.0);
float k = (r*r) / 8.0;
float nom = NdotV;
float denom = NdotV * (1.0 - k) + k;
return nom / denom;
}
// ----------------------------------------------------------------------------
float GeometrySmith(vec3 N, vec3 V, vec3 L, float roughness)
{
float NdotV = max(dot(N, V), 0.0);
float NdotL = max(dot(N, L), 0.0);
float ggx2 = GeometrySchlickGGX(NdotV, roughness);
float ggx1 = GeometrySchlickGGX(NdotL, roughness);
return ggx1 * ggx2;
}
// ----------------------------------------------------------------------------
vec3 fresnelSchlick(float cosTheta, vec3 F0)
{
return F0 + (1.0 - F0) * pow(1.0 - cosTheta, 5.0);
}
// ----------------------------------------------------------------------------
void main()
{
vec3 albedo = pow(texture(albedoMap, TexCoords).rgb, vec3(2.2));
float metallic = texture(metallicMap, TexCoords).r;
float roughness = texture(roughnessMap, TexCoords).r;
float ao = texture(aoMap, TexCoords).r;
vec3 N = getNormalFromMap();
vec3 V = normalize(camPos - WorldPos);
// calculate reflectance at normal incidence; if dia-electric (like plastic) use F0
// of 0.04 and if it's a metal, use their albedo color as F0 (metallic workflow)
vec3 F0 = vec3(0.04);
F0 = mix(F0, albedo, metallic);
// reflectance equation
vec3 Lo = vec3(0.0);
for(int i = 0; i < 4; ++i)
{
// calculate per-light radiance
vec3 L = normalize(lightPositions[i] - WorldPos);
vec3 H = normalize(V + L);
float distance = length(lightPositions[i] - WorldPos);
float attenuation = 1.0 / (distance * distance);
vec3 radiance = lightColors[i] * attenuation;
// Cook-Torrance BRDF
float NDF = DistributionGGX(N, H, roughness);
float G = GeometrySmith(N, V, L, roughness);
vec3 F = fresnelSchlick(max(dot(H, V), 0.0), F0);
vec3 nominator = NDF * G * F;
float denominator = 4 * max(dot(N, V), 0.0) * max(dot(N, L), 0.0) + 0.001; // 0.001 to prevent divide by zero.
vec3 specular = nominator / denominator;
// kS is equal to Fresnel
vec3 kS = F;
// for energy conservation, the diffuse and specular light can't
// be above 1.0 (unless the surface emits light); to preserve this
// relationship the diffuse component (kD) should equal 1.0 - kS.
vec3 kD = vec3(1.0) - kS;
// multiply kD by the inverse metalness such that only non-metals
// have diffuse lighting, or a linear blend if partly metal (pure metals
// have no diffuse light).
kD *= 1.0 - metallic;
// scale light by NdotL
float NdotL = max(dot(N, L), 0.0);
// add to outgoing radiance Lo
Lo += (kD * albedo / PI + specular) * radiance * NdotL; // note that we already multiplied the BRDF by the Fresnel (kS) so we won't multiply by kS again
}
// ambient lighting (note that the next IBL tutorial will replace
// this ambient lighting with environment lighting).
vec3 ambient = vec3(0.03) * albedo * ao;
vec3 color = ambient + Lo;
// HDR tonemapping
color = color / (color + vec3(1.0));
// gamma correct
color = pow(color, vec3(1.0/2.2));
FragColor = vec4(color, 1.0);
}

0
src/6.pbr/1.2.lighting_textured/pbr.vs → src/6.pbr/1.2.lighting_textured/1.2.pbr.vs
View File

4
src/6.pbr/2.1.1.ibl_irradiance_conversion/2.1.1.pbr.frag
View File

@@ -93,7 +93,7 @@ void main()
vec3 nominator = NDF * G * F;
float denominator = 4 * max(dot(N, V), 0.0) * max(dot(N, L), 0.0) + 0.001; // 0.001 to prevent divide by zero.
vec3 brdf = nominator / denominator;
vec3 specular = nominator / denominator;
// kS is equal to Fresnel
vec3 kS = F;
@@ -110,7 +110,7 @@ void main()
float NdotL = max(dot(N, L), 0.0);
// add to outgoing radiance Lo
Lo += (kD * albedo / PI + brdf) * radiance * NdotL; // note that we already multiplied the BRDF by the Fresnel (kS) so we won't multiply by kS again
Lo += (kD * albedo / PI + specular) * radiance * NdotL; // note that we already multiplied the BRDF by the Fresnel (kS) so we won't multiply by kS again
}
vec3 ambient = vec3(0.03) * albedo * ao;

4
src/6.pbr/2.1.2.ibl_irradiance/2.1.2.pbr.frag
View File

@@ -91,7 +91,7 @@ void main()
vec3 nominator = NDF * G * F;
float denominator = 4 * max(dot(N, V), 0.0) * max(dot(N, L), 0.0) + 0.001; // 0.001 to prevent divide by zero.
vec3 brdf = nominator / denominator;
vec3 specular = nominator / denominator;
// kS is equal to Fresnel
vec3 kS = F;
@@ -108,7 +108,7 @@ void main()
float NdotL = max(dot(N, L), 0.0);
// add to outgoing radiance Lo
Lo += (kD * albedo / PI + brdf) * radiance * NdotL; // note that we already multiplied the BRDF by the Fresnel (kS) so we won't multiply by kS again
Lo += (kD * albedo / PI + specular) * radiance * NdotL; // note that we already multiplied the BRDF by the Fresnel (kS) so we won't multiply by kS again
}
// ambient lighting (we now use IBL as the ambient term)

4
src/6.pbr/2.2.1.ibl_specular/2.2.1.pbr.frag
View File

@@ -98,7 +98,7 @@ void main()
vec3 nominator = NDF * G * F;
float denominator = 4 * max(dot(N, V), 0.0) * max(dot(N, L), 0.0) + 0.001; // 0.001 to prevent divide by zero.
vec3 brdf = nominator / denominator;
vec3 specular = nominator / denominator;
// kS is equal to Fresnel
vec3 kS = F;
@@ -115,7 +115,7 @@ void main()
float NdotL = max(dot(N, L), 0.0);
// add to outgoing radiance Lo
Lo += (kD * albedo / PI + brdf) * radiance * NdotL; // note that we already multiplied the BRDF by the Fresnel (kS) so we won't multiply by kS again
Lo += (kD * albedo / PI + specular) * radiance * NdotL; // note that we already multiplied the BRDF by the Fresnel (kS) so we won't multiply by kS again
}
// ambient lighting (we now use IBL as the ambient term)