lenn/LearnOpenGL
1
0
Fork 0
mirror of https://github.com/JoeyDeVries/LearnOpenGL.git synced 2026-01-02 04:37:54 +08:00
Code Issues Packages Projects Releases Wiki Activity

New tutorial code

Browse Source 
Added code of new tutorials to the repository
This commit is contained in:
Joey de Vries
2015-07-15 11:48:45 +02:00
parent 05b24d9268
commit eac76c9a50
16 changed files with 1039 additions and 415 deletions
Download Patch File Download Diff File Expand all files Collapse all files

4
CMakeLists.txt
View File

@@ -115,8 +115,8 @@ set(5.advanced_lighting
5.parallax_mapping
6.hdr
7.bloom
# 8.deferred_shading
# 9.ssao
8.deferred_shading
9.ssao
)

15
includes/learnopengl/shader.h
View File

@@ -19,11 +19,18 @@ public:
std::string vertexCode;
std::string fragmentCode;
std::string geometryCode;
std::ifstream vShaderFile;
std::ifstream fShaderFile;
std::ifstream gShaderFile;
// ensures ifstream objects can throw exceptions:
vShaderFile.exceptions (std::ifstream::failbit | std::ifstream::badbit);
fShaderFile.exceptions (std::ifstream::failbit | std::ifstream::badbit);
gShaderFile.exceptions (std::ifstream::failbit | std::ifstream::badbit);
try
{
// Open files
std::ifstream vShaderFile(vertexPath);
std::ifstream fShaderFile(fragmentPath);
vShaderFile.open(vertexPath);
fShaderFile.open(fragmentPath);
std::stringstream vShaderStream, fShaderStream;
// Read file's buffer contents into streams
vShaderStream << vShaderFile.rdbuf();
@@ -37,14 +44,14 @@ public:
// If geometry shader path is present, also load a geometry shader
if(geometryPath != nullptr)
{
std::ifstream gShaderFile(geometryPath);
gShaderFile.open(geometryPath);
std::stringstream gShaderStream;
gShaderStream << gShaderFile.rdbuf();
gShaderFile.close();
geometryCode = gShaderStream.str();
}
}
catch (std::exception e)
catch (std::ifstream::failure e)
{
std::cout << "ERROR::SHADER::FILE_NOT_SUCCESFULLY_READ" << std::endl;
}

9
src/5.advanced_lighting/8.deferred_shading/deferred_light_box.frag Normal file
View File

@@ -0,0 +1,9 @@
#version 330 core
layout (location = 0) out vec4 FragColor;
uniform vec3 lightColor;
void main()
{
FragColor = vec4(lightColor, 1.0);
}

13
src/5.advanced_lighting/8.deferred_shading/deferred_light_box.vs Normal file
View File

@@ -0,0 +1,13 @@
#version 330 core
layout (location = 0) in vec3 position;
layout (location = 1) in vec3 normal;
layout (location = 2) in vec2 texCoords;
uniform mat4 projection;
uniform mat4 view;
uniform mat4 model;
void main()
{
gl_Position = projection * view * model * vec4(position, 1.0f);
}

583
src/5.advanced_lighting/8.deferred_shading/deferred_shading.cpp
View File

@@ -1,6 +1,3 @@
// Std. Includes
#include <string>
// GLEW
#define GLEW_STATIC
#include <GL/glew.h>
@@ -11,6 +8,7 @@
// GL includes
#include <learnopengl/shader.h>
#include <learnopengl/camera.h>
#include <learnopengl/model.h>
// GLM Mathemtics
#include <glm/glm.hpp>
@@ -21,7 +19,7 @@
#include <SOIL.h>
// Properties
GLuint screenWidth = 800, screenHeight = 600;
const GLuint SCR_WIDTH = 800, SCR_HEIGHT = 600;
// Function prototypes
void key_callback(GLFWwindow* window, int key, int scancode, int action, int mode);
@@ -29,262 +27,411 @@ void scroll_callback(GLFWwindow* window, double xoffset, double yoffset);
void mouse_callback(GLFWwindow* window, double xpos, double ypos);
void Do_Movement();
GLuint loadTexture(GLchar* path);
void RenderCube();
void RenderQuad();
// Camera
Camera camera(glm::vec3(0.0f, 0.0f, 3.0f));
bool keys[1024];
GLfloat lastX = 400, lastY = 300;
bool firstMouse = true;
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);
// 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(screenWidth, screenHeight, "LearnOpenGL", nullptr, nullptr); // Windowed
glfwMakeContextCurrent(window);
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);
// 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);
// Options
glfwSetInputMode(window, GLFW_CURSOR, GLFW_CURSOR_DISABLED);
// Initialize GLEW to setup the OpenGL Function pointers
glewExperimental = GL_TRUE;
glewInit();
// Initialize GLEW to setup the OpenGL Function pointers
glewExperimental = GL_TRUE;
glewInit();
// Define the viewport dimensions
glViewport(0, 0, screenWidth, screenHeight);
// Define the viewport dimensions
glViewport(0, 0, SCR_WIDTH, SCR_HEIGHT);
// Setup some OpenGL options
glEnable(GL_DEPTH_TEST);
// glDepthFunc(GL_ALWAYS); // Set to always pass the depth test (same effect as glDisable(GL_DEPTH_TEST))
// Setup some OpenGL options
glEnable(GL_DEPTH_TEST);
// Setup and compile our shaders
Shader shader("depth_testing.vs", "depth_testing.frag");
// 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");
#pragma region "object_initialization"
// Set the object data (buffers, vertex attributes)
GLfloat cubeVertices[] = {
// Positions // Texture Coords
-0.5f, -0.5f, -0.5f, 0.0f, 0.0f,
0.5f, -0.5f, -0.5f, 1.0f, 0.0f,
0.5f, 0.5f, -0.5f, 1.0f, 1.0f,
0.5f, 0.5f, -0.5f, 1.0f, 1.0f,
-0.5f, 0.5f, -0.5f, 0.0f, 1.0f,
-0.5f, -0.5f, -0.5f, 0.0f, 0.0f,
// Set samplers
shaderLightingPass.Use();
glUniform1i(glGetUniformLocation(shaderLightingPass.Program, "gPosition"), 0);
glUniform1i(glGetUniformLocation(shaderLightingPass.Program, "gNormal"), 1);
glUniform1i(glGetUniformLocation(shaderLightingPass.Program, "gAlbedoSpec"), 2);
-0.5f, -0.5f, 0.5f, 0.0f, 0.0f,
0.5f, -0.5f, 0.5f, 1.0f, 0.0f,
0.5f, 0.5f, 0.5f, 1.0f, 1.0f,
0.5f, 0.5f, 0.5f, 1.0f, 1.0f,
-0.5f, 0.5f, 0.5f, 0.0f, 1.0f,
-0.5f, -0.5f, 0.5f, 0.0f, 0.0f,
-0.5f, 0.5f, 0.5f, 1.0f, 0.0f,
-0.5f, 0.5f, -0.5f, 1.0f, 1.0f,
-0.5f, -0.5f, -0.5f, 0.0f, 1.0f,
-0.5f, -0.5f, -0.5f, 0.0f, 1.0f,
-0.5f, -0.5f, 0.5f, 0.0f, 0.0f,
-0.5f, 0.5f, 0.5f, 1.0f, 0.0f,
0.5f, 0.5f, 0.5f, 1.0f, 0.0f,
0.5f, 0.5f, -0.5f, 1.0f, 1.0f,
0.5f, -0.5f, -0.5f, 0.0f, 1.0f,
0.5f, -0.5f, -0.5f, 0.0f, 1.0f,
0.5f, -0.5f, 0.5f, 0.0f, 0.0f,
0.5f, 0.5f, 0.5f, 1.0f, 0.0f,
-0.5f, -0.5f, -0.5f, 0.0f, 1.0f,
0.5f, -0.5f, -0.5f, 1.0f, 1.0f,
0.5f, -0.5f, 0.5f, 1.0f, 0.0f,
0.5f, -0.5f, 0.5f, 1.0f, 0.0f,
-0.5f, -0.5f, 0.5f, 0.0f, 0.0f,
-0.5f, -0.5f, -0.5f, 0.0f, 1.0f,
-0.5f, 0.5f, -0.5f, 0.0f, 1.0f,
0.5f, 0.5f, -0.5f, 1.0f, 1.0f,
0.5f, 0.5f, 0.5f, 1.0f, 0.0f,
0.5f, 0.5f, 0.5f, 1.0f, 0.0f,
-0.5f, 0.5f, 0.5f, 0.0f, 0.0f,
-0.5f, 0.5f, -0.5f, 0.0f, 1.0f
};
GLfloat planeVertices[] = {
// Positions // Texture Coords (note we set these higher than 1 that together with GL_REPEAT as texture wrapping mode will cause the floor texture to repeat)
5.0f, -0.5f, 5.0f, 2.0f, 0.0f,
-5.0f, -0.5f, 5.0f, 0.0f, 0.0f,
-5.0f, -0.5f, -5.0f, 0.0f, 2.0f,
5.0f, -0.5f, 5.0f, 2.0f, 0.0f,
-5.0f, -0.5f, -5.0f, 0.0f, 2.0f,
5.0f, -0.5f, -5.0f, 2.0f, 2.0f
};
// Setup cube VAO
GLuint cubeVAO, cubeVBO;
glGenVertexArrays(1, &cubeVAO);
glGenBuffers(1, &cubeVBO);
glBindVertexArray(cubeVAO);
glBindBuffer(GL_ARRAY_BUFFER, cubeVBO);
glBufferData(GL_ARRAY_BUFFER, sizeof(cubeVertices), &cubeVertices, 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(0);
// Setup plane VAO
GLuint 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);
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(0);
// Load textures
GLuint cubeTexture = loadTexture("../../../resources/textures/marble.jpg");
GLuint floorTexture = loadTexture("../../../resources/textures/metal.png");
#pragma endregion
// Game loop
while(!glfwWindowShouldClose(window))
// Models
Model cyborg("../../../resources/objects/nanosuit/nanosuit.obj");
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++)
{
// 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);
// Draw objects
shader.Use();
glm::mat4 model;
glm::mat4 view = camera.GetViewMatrix();
glm::mat4 projection = glm::perspective(camera.Zoom, (float)screenWidth/(float)screenHeight, 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));
// Cubes
glBindVertexArray(cubeVAO);
glBindTexture(GL_TEXTURE_2D, cubeTexture); // We omit the glActiveTexture part since TEXTURE0 is already the default active texture unit. (sampler used in fragment is set to 0 as well as default)
model = glm::translate(model, glm::vec3(-1.0f, 0.0f, -1.0f));
glUniformMatrix4fv(glGetUniformLocation(shader.Program, "model"), 1, GL_FALSE, glm::value_ptr(model));
glDrawArrays(GL_TRIANGLES, 0, 36);
model = glm::mat4();
model = glm::translate(model, glm::vec3(2.0f, 0.0f, 0.0f));
glUniformMatrix4fv(glGetUniformLocation(shader.Program, "model"), 1, GL_FALSE, glm::value_ptr(model));
glDrawArrays(GL_TRIANGLES, 0, 36);
// Floor
glBindVertexArray(planeVAO);
glBindTexture(GL_TEXTURE_2D, floorTexture);
model = glm::mat4();
glUniformMatrix4fv(glGetUniformLocation(shader.Program, "model"), 1, GL_FALSE, glm::value_ptr(model));
glDrawArrays(GL_TRIANGLES, 0, 6);
glBindVertexArray(0);
// Swap the buffers
glfwSwapBuffers(window);
// 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));
}
glfwTerminate();
return 0;
// 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_RGB, 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_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_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 + std::sqrtf(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
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;
}
// 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* path)
// RenderQuad() Renders a 1x1 quad in NDC, best used for framebuffer color targets
// and post-processing effects.
GLuint quadVAO = 0;
GLuint quadVBO;
void RenderQuad()
{
//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;
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);
}
#pragma region "User input"
// 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);
// 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 == GLFW_KEY_ESCAPE && action == GLFW_PRESS)
glfwSetWindowShouldClose(window, GL_TRUE);
if(action == GLFW_PRESS)
keys[key] = true;
else if(action == GLFW_RELEASE)
keys[key] = false;
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;
}
if (firstMouse)
{
lastX = xpos;
lastY = ypos;
firstMouse = false;
}
GLfloat xoffset = xpos - lastX;
GLfloat yoffset = lastY - ypos;
lastX = xpos;
lastY = ypos;
GLfloat xoffset = xpos - lastX;
GLfloat yoffset = lastY - ypos;
camera.ProcessMouseMovement(xoffset, yoffset);
}
lastX = xpos;
lastY = ypos;
camera.ProcessMouseMovement(xoffset, yoffset);
}
void scroll_callback(GLFWwindow* window, double xoffset, double yoffset)
{
camera.ProcessMouseScroll(yoffset);
}
#pragma endregion
camera.ProcessMouseScroll(yoffset);
}

72
src/5.advanced_lighting/8.deferred_shading/deferred_shading.frag
View File

@@ -1,16 +1,66 @@
#version 330 core
out vec4 color;
out vec4 FragColor;
in vec2 TexCoords;
float LinearizeDepth(float depth) // Note that this ranges from [0,1] instead of up to 'far plane distance' since we divide by 'far'
{
float near = 0.1;
float far = 100.0;
float z = depth * 2.0 - 1.0; // Back to NDC
return (2.0 * near) / (far + near - z * (far - near));
}
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()
{
float depth = LinearizeDepth(gl_FragCoord.z);
color = vec4(vec3(depth), 1.0f);
}
// 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);
}

6
src/5.advanced_lighting/8.deferred_shading/deferred_shading.vs
View File

@@ -4,12 +4,8 @@ layout (location = 1) in vec2 texCoords;
out vec2 TexCoords;
uniform mat4 model;
uniform mat4 view;
uniform mat4 projection;
void main()
{
gl_Position = projection * view * model * vec4(position, 1.0f);
gl_Position = vec4(position, 1.0f);
TexCoords = texCoords;
}

23
src/5.advanced_lighting/8.deferred_shading/g_buffer.frag Normal file
View File

@@ -0,0 +1,23 @@
#version 330 core
layout (location = 0) out vec3 gPosition;
layout (location = 1) out vec3 gNormal;
layout (location = 2) out vec4 gAlbedoSpec;
in vec2 TexCoords;
in vec3 FragPos;
in vec3 Normal;
uniform sampler2D texture_diffuse1;
uniform sampler2D texture_specular1;
void main()
{
// Store the fragment position vector in the first gbuffer texture
gPosition = FragPos;
// Also store the per-fragment normals into the gbuffer
gNormal = normalize(Normal);
// And the diffuse per-fragment color
gAlbedoSpec.rgb = texture(texture_diffuse1, TexCoords).rgb;
// Store specular intensity in gAlbedoSpec's alpha component
gAlbedoSpec.a = texture(texture_specular1, TexCoords).r;
}

23
src/5.advanced_lighting/8.deferred_shading/g_buffer.vs Normal file
View File

@@ -0,0 +1,23 @@
#version 330 core
layout (location = 0) in vec3 position;
layout (location = 1) in vec3 normal;
layout (location = 2) in vec2 texCoords;
out vec3 FragPos;
out vec2 TexCoords;
out vec3 Normal;
uniform mat4 model;
uniform mat4 view;
uniform mat4 projection;
void main()
{
vec4 worldPos = model * vec4(position, 1.0f);
FragPos = worldPos.xyz;
gl_Position = projection * view * worldPos;
TexCoords = texCoords;
mat3 normalMatrix = transpose(inverse(mat3(model)));
Normal = normalMatrix * normal;
}

511
src/5.advanced_lighting/9.ssao/ssao.cpp
View File

@@ -1,6 +1,3 @@
// Std. Includes
#include <string>
// GLEW
#define GLEW_STATIC
#include <GL/glew.h>
@@ -11,6 +8,7 @@
// GL includes
#include <learnopengl/shader.h>
#include <learnopengl/camera.h>
#include <learnopengl/model.h>
// GLM Mathemtics
#include <glm/glm.hpp>
@@ -20,25 +18,34 @@
// Other Libs
#include <SOIL.h>
#include <random> // necessary for generation of random floats (for sample kernel and noise texture)
// Properties
GLuint screenWidth = 800, screenHeight = 600;
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* path);
void RenderCube();
void RenderQuad();
// Camera
Camera camera(glm::vec3(0.0f, 0.0f, 3.0f));
bool keys[1024];
GLfloat lastX = 400, lastY = 300;
bool firstMouse = true;
Camera camera(glm::vec3(0.0f, 0.0f, 5.0f));
// Delta
GLfloat deltaTime = 0.0f;
GLfloat lastFrame = 0.0f;
// Options
GLuint draw_mode = 1;
GLfloat lerp(GLfloat a, GLfloat b, GLfloat f)
{
return a + f * (b - a);
}
// The MAIN function, from here we start our application and run our Game loop
int main()
{
@@ -49,7 +56,7 @@ int main()
glfwWindowHint(GLFW_OPENGL_PROFILE, GLFW_OPENGL_CORE_PROFILE);
glfwWindowHint(GLFW_RESIZABLE, GL_FALSE);
GLFWwindow* window = glfwCreateWindow(screenWidth, screenHeight, "LearnOpenGL", nullptr, nullptr); // Windowed
GLFWwindow* window = glfwCreateWindow(SCR_WIDTH, SCR_HEIGHT, "LearnOpenGL", nullptr, nullptr); // Windowed
glfwMakeContextCurrent(window);
// Set the required callback functions
@@ -63,105 +70,146 @@ int main()
// Initialize GLEW to setup the OpenGL Function pointers
glewExperimental = GL_TRUE;
glewInit();
glGetError();
// Define the viewport dimensions
glViewport(0, 0, screenWidth, screenHeight);
glViewport(0, 0, SCR_WIDTH, SCR_HEIGHT);
// Setup some OpenGL options
glEnable(GL_DEPTH_TEST);
// glDepthFunc(GL_ALWAYS); // Set to always pass the depth test (same effect as glDisable(GL_DEPTH_TEST))
// Setup and compile our shaders
Shader shader("depth_testing.vs", "depth_testing.frag");
Shader shaderGeometryPass("ssao_geometry.vs", "ssao_geometry.frag");
Shader shaderLightingPass("ssao.vs", "ssao_lighting.frag");
Shader shaderSSAO("ssao.vs", "ssao.frag");
Shader shaderSSAOBlur("ssao.vs", "ssao_blur.frag");
#pragma region "object_initialization"
// Set the object data (buffers, vertex attributes)
GLfloat cubeVertices[] = {
// Positions // Texture Coords
-0.5f, -0.5f, -0.5f, 0.0f, 0.0f,
0.5f, -0.5f, -0.5f, 1.0f, 0.0f,
0.5f, 0.5f, -0.5f, 1.0f, 1.0f,
0.5f, 0.5f, -0.5f, 1.0f, 1.0f,
-0.5f, 0.5f, -0.5f, 0.0f, 1.0f,
-0.5f, -0.5f, -0.5f, 0.0f, 0.0f,
// Set samplers
shaderLightingPass.Use();
glUniform1i(glGetUniformLocation(shaderLightingPass.Program, "gPositionDepth"), 0);
glUniform1i(glGetUniformLocation(shaderLightingPass.Program, "gNormal"), 1);
glUniform1i(glGetUniformLocation(shaderLightingPass.Program, "gAlbedo"), 2);
glUniform1i(glGetUniformLocation(shaderLightingPass.Program, "ssao"), 3);
shaderSSAO.Use();
glUniform1i(glGetUniformLocation(shaderSSAO.Program, "gPositionDepth"), 0);
glUniform1i(glGetUniformLocation(shaderSSAO.Program, "gNormal"), 1);
glUniform1i(glGetUniformLocation(shaderSSAO.Program, "texNoise"), 2);
-0.5f, -0.5f, 0.5f, 0.0f, 0.0f,
0.5f, -0.5f, 0.5f, 1.0f, 0.0f,
0.5f, 0.5f, 0.5f, 1.0f, 1.0f,
0.5f, 0.5f, 0.5f, 1.0f, 1.0f,
-0.5f, 0.5f, 0.5f, 0.0f, 1.0f,
-0.5f, -0.5f, 0.5f, 0.0f, 0.0f,
// Objects
Model nanosuit("../../../resources/objects/nanosuit/nanosuit.obj");
-0.5f, 0.5f, 0.5f, 1.0f, 0.0f,
-0.5f, 0.5f, -0.5f, 1.0f, 1.0f,
-0.5f, -0.5f, -0.5f, 0.0f, 1.0f,
-0.5f, -0.5f, -0.5f, 0.0f, 1.0f,
-0.5f, -0.5f, 0.5f, 0.0f, 0.0f,
-0.5f, 0.5f, 0.5f, 1.0f, 0.0f,
// Lights
glm::vec3 lightPos = glm::vec3(2.0, 4.0, -2.0);
glm::vec3 lightColor = glm::vec3(0.2, 0.2, 0.7);
0.5f, 0.5f, 0.5f, 1.0f, 0.0f,
0.5f, 0.5f, -0.5f, 1.0f, 1.0f,
0.5f, -0.5f, -0.5f, 0.0f, 1.0f,
0.5f, -0.5f, -0.5f, 0.0f, 1.0f,
0.5f, -0.5f, 0.5f, 0.0f, 0.0f,
0.5f, 0.5f, 0.5f, 1.0f, 0.0f,
// Set up G-Buffer
// 3 textures:
// 1. Positions + depth (RGBA)
// 2. Color (RGB)
// 3. Normals (RGB)
GLuint gBuffer;
glGenFramebuffers(1, &gBuffer);
glBindFramebuffer(GL_FRAMEBUFFER, gBuffer);
GLuint gPositionDepth, gNormal, gAlbedo;
// - Position + linear depth color buffer
glGenTextures(1, &gPositionDepth);
glBindTexture(GL_TEXTURE_2D, gPositionDepth);
glTexImage2D(GL_TEXTURE_2D, 0, GL_RGBA16F, 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);
glTexParameteri(GL_TEXTURE_2D, GL_TEXTURE_WRAP_S, GL_CLAMP_TO_EDGE);
glTexParameteri(GL_TEXTURE_2D, GL_TEXTURE_WRAP_T, GL_CLAMP_TO_EDGE);
glFramebufferTexture2D(GL_FRAMEBUFFER, GL_COLOR_ATTACHMENT0, GL_TEXTURE_2D, gPositionDepth, 0);
// - Normal color buffer
glGenTextures(1, &gNormal);
glBindTexture(GL_TEXTURE_2D, gNormal);
glTexImage2D(GL_TEXTURE_2D, 0, GL_RGB, 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);
// - Albedo color buffer
glGenTextures(1, &gAlbedo);
glBindTexture(GL_TEXTURE_2D, gAlbedo);
glTexImage2D(GL_TEXTURE_2D, 0, GL_RGB, SCR_WIDTH, SCR_HEIGHT, 0, GL_RGBA, 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_ATTACHMENT2, GL_TEXTURE_2D, gAlbedo, 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 << "GBuffer Framebuffer not complete!" << std::endl;
-0.5f, -0.5f, -0.5f, 0.0f, 1.0f,
0.5f, -0.5f, -0.5f, 1.0f, 1.0f,
0.5f, -0.5f, 0.5f, 1.0f, 0.0f,
0.5f, -0.5f, 0.5f, 1.0f, 0.0f,
-0.5f, -0.5f, 0.5f, 0.0f, 0.0f,
-0.5f, -0.5f, -0.5f, 0.0f, 1.0f,
// Also create framebuffer to hold SSAO processing stage
GLuint ssaoFBO, ssaoBlurFBO;
glGenFramebuffers(1, &ssaoFBO); glGenFramebuffers(1, &ssaoBlurFBO);
glBindFramebuffer(GL_FRAMEBUFFER, ssaoFBO);
GLuint ssaoColorBuffer, ssaoColorBufferBlur;
// - SSAO color buffer
glGenTextures(1, &ssaoColorBuffer);
glBindTexture(GL_TEXTURE_2D, ssaoColorBuffer);
glTexImage2D(GL_TEXTURE_2D, 0, GL_RED, 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, ssaoColorBuffer, 0);
if (glCheckFramebufferStatus(GL_FRAMEBUFFER) != GL_FRAMEBUFFER_COMPLETE)
std::cout << "SSAO Framebuffer not complete!" << std::endl;
// - and blur stage
glBindFramebuffer(GL_FRAMEBUFFER, ssaoBlurFBO);
glGenTextures(1, &ssaoColorBufferBlur);
glBindTexture(GL_TEXTURE_2D, ssaoColorBufferBlur);
glTexImage2D(GL_TEXTURE_2D, 0, GL_RED, 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, ssaoColorBufferBlur, 0);
if (glCheckFramebufferStatus(GL_FRAMEBUFFER) != GL_FRAMEBUFFER_COMPLETE)
std::cout << "SSAO Blur Framebuffer not complete!" << std::endl;
glBindFramebuffer(GL_FRAMEBUFFER, 0);
-0.5f, 0.5f, -0.5f, 0.0f, 1.0f,
0.5f, 0.5f, -0.5f, 1.0f, 1.0f,
0.5f, 0.5f, 0.5f, 1.0f, 0.0f,
0.5f, 0.5f, 0.5f, 1.0f, 0.0f,
-0.5f, 0.5f, 0.5f, 0.0f, 0.0f,
-0.5f, 0.5f, -0.5f, 0.0f, 1.0f
};
GLfloat planeVertices[] = {
// Positions // Texture Coords (note we set these higher than 1 that together with GL_REPEAT as texture wrapping mode will cause the floor texture to repeat)
5.0f, -0.5f, 5.0f, 2.0f, 0.0f,
-5.0f, -0.5f, 5.0f, 0.0f, 0.0f,
-5.0f, -0.5f, -5.0f, 0.0f, 2.0f,
// Sample kernel
std::uniform_real_distribution<GLfloat> randomFloats(0.0, 1.0); // generates random floats between 0.0 and 1.0
std::default_random_engine generator;
std::vector<glm::vec3> ssaoKernel;
for (GLuint i = 0; i < 64; ++i)
{
glm::vec3 sample(randomFloats(generator) * 2.0 - 1.0, randomFloats(generator) * 2.0 - 1.0, randomFloats(generator));
sample = glm::normalize(sample);
sample *= randomFloats(generator);
GLfloat scale = GLfloat(i) / 64.0;
5.0f, -0.5f, 5.0f, 2.0f, 0.0f,
-5.0f, -0.5f, -5.0f, 0.0f, 2.0f,
5.0f, -0.5f, -5.0f, 2.0f, 2.0f
};
// Setup cube VAO
GLuint cubeVAO, cubeVBO;
glGenVertexArrays(1, &cubeVAO);
glGenBuffers(1, &cubeVBO);
glBindVertexArray(cubeVAO);
glBindBuffer(GL_ARRAY_BUFFER, cubeVBO);
glBufferData(GL_ARRAY_BUFFER, sizeof(cubeVertices), &cubeVertices, 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(0);
// Setup plane VAO
GLuint 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);
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(0);
// Scale samples s.t. they're more aligned to center of kernel
scale = lerp(0.1f, 1.0f, scale * scale);
sample *= scale;
ssaoKernel.push_back(sample);
}
// Load textures
GLuint cubeTexture = loadTexture("../../../resources/textures/marble.jpg");
GLuint floorTexture = loadTexture("../../../resources/textures/metal.png");
#pragma endregion
// Noise texture
std::vector<glm::vec3> ssaoNoise;
for (GLuint i = 0; i < 16; i++)
{
glm::vec3 noise(randomFloats(generator) * 2.0 - 1.0, randomFloats(generator) * 2.0 - 1.0, 0.0f); // rotate around z-axis (in tangent space)
ssaoNoise.push_back(noise);
}
GLuint noiseTexture; glGenTextures(1, &noiseTexture);
glBindTexture(GL_TEXTURE_2D, noiseTexture);
glTexImage2D(GL_TEXTURE_2D, 0, GL_RGB16F, 4, 4, 0, GL_RGB, GL_FLOAT, &ssaoNoise[0]);
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_REPEAT);
glTexParameteri(GL_TEXTURE_2D, GL_TEXTURE_WRAP_T, GL_REPEAT);
glClearColor(0.0f, 0.0f, 0.0f, 1.0f);
// Game loop
while(!glfwWindowShouldClose(window))
while (!glfwWindowShouldClose(window))
{
// Set frame time
GLfloat currentFrame = glfwGetTime();
@@ -172,34 +220,82 @@ int main()
glfwPollEvents();
Do_Movement();
// Clear the colorbuffer
glClearColor(0.1f, 0.1f, 0.1f, 1.0f);
glClear(GL_COLOR_BUFFER_BIT | GL_DEPTH_BUFFER_BIT);
// Draw objects
shader.Use();
glm::mat4 model;
glm::mat4 view = camera.GetViewMatrix();
glm::mat4 projection = glm::perspective(camera.Zoom, (float)screenWidth/(float)screenHeight, 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));
// Cubes
glBindVertexArray(cubeVAO);
glBindTexture(GL_TEXTURE_2D, cubeTexture); // We omit the glActiveTexture part since TEXTURE0 is already the default active texture unit. (sampler used in fragment is set to 0 as well as default)
model = glm::translate(model, glm::vec3(-1.0f, 0.0f, -1.0f));
glUniformMatrix4fv(glGetUniformLocation(shader.Program, "model"), 1, GL_FALSE, glm::value_ptr(model));
glDrawArrays(GL_TRIANGLES, 0, 36);
model = glm::mat4();
model = glm::translate(model, glm::vec3(2.0f, 0.0f, 0.0f));
glUniformMatrix4fv(glGetUniformLocation(shader.Program, "model"), 1, GL_FALSE, glm::value_ptr(model));
glDrawArrays(GL_TRIANGLES, 0, 36);
// Floor
glBindVertexArray(planeVAO);
glBindTexture(GL_TEXTURE_2D, floorTexture);
model = glm::mat4();
glUniformMatrix4fv(glGetUniformLocation(shader.Program, "model"), 1, GL_FALSE, glm::value_ptr(model));
glDrawArrays(GL_TRIANGLES, 0, 6);
glBindVertexArray(0);
// 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, 50.0f);
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));
// Floor cube
model = glm::translate(model, glm::vec3(0.0, -1.0f, 0.0f));
model = glm::scale(model, glm::vec3(20.0f, 1.0f, 20.0f));
glUniformMatrix4fv(glGetUniformLocation(shaderGeometryPass.Program, "model"), 1, GL_FALSE, glm::value_ptr(model));
RenderCube();
// Nanosuit model on the floor
model = glm::mat4();
model = glm::translate(model, glm::vec3(0.0f, 0.0f, 5.0));
model = glm::rotate(model, -90.0f, glm::vec3(1.0, 0.0, 0.0));
model = glm::scale(model, glm::vec3(0.5f));
glUniformMatrix4fv(glGetUniformLocation(shaderGeometryPass.Program, "model"), 1, GL_FALSE, glm::value_ptr(model));
nanosuit.Draw(shaderGeometryPass);
glBindFramebuffer(GL_FRAMEBUFFER, 0);
// 2. Create SSAO texture
glBindFramebuffer(GL_FRAMEBUFFER, ssaoFBO);
glClear(GL_COLOR_BUFFER_BIT);
shaderSSAO.Use();
glActiveTexture(GL_TEXTURE0);
glBindTexture(GL_TEXTURE_2D, gPositionDepth);
glActiveTexture(GL_TEXTURE1);
glBindTexture(GL_TEXTURE_2D, gNormal);
glActiveTexture(GL_TEXTURE2);
glBindTexture(GL_TEXTURE_2D, noiseTexture);
// Send kernel + rotation
for (GLuint i = 0; i < 64; ++i)
glUniform3fv(glGetUniformLocation(shaderSSAO.Program, ("samples[" + std::to_string(i) + "]").c_str()), 1, &ssaoKernel[i][0]);
glUniformMatrix4fv(glGetUniformLocation(shaderSSAO.Program, "projection"), 1, GL_FALSE, glm::value_ptr(projection));
RenderQuad();
glBindFramebuffer(GL_FRAMEBUFFER, 0);
// 3. Blur SSAO texture to remove noise
glBindFramebuffer(GL_FRAMEBUFFER, ssaoBlurFBO);
glClear(GL_COLOR_BUFFER_BIT);
shaderSSAOBlur.Use();
glActiveTexture(GL_TEXTURE0);
glBindTexture(GL_TEXTURE_2D, ssaoColorBuffer);
RenderQuad();
glBindFramebuffer(GL_FRAMEBUFFER, 0);
// 4. Lighting Pass: traditional deferred Blinn-Phong lighting now with added screen-space ambient occlusion
glClear(GL_COLOR_BUFFER_BIT | GL_DEPTH_BUFFER_BIT);
shaderLightingPass.Use();
glActiveTexture(GL_TEXTURE0);
glBindTexture(GL_TEXTURE_2D, gPositionDepth);
glActiveTexture(GL_TEXTURE1);
glBindTexture(GL_TEXTURE_2D, gNormal);
glActiveTexture(GL_TEXTURE2);
glBindTexture(GL_TEXTURE_2D, gAlbedo);
glActiveTexture(GL_TEXTURE3); // Add extra SSAO texture to lighting pass
glBindTexture(GL_TEXTURE_2D, ssaoColorBufferBlur);
// Also send light relevant uniforms
glm::vec3 lightPosView = glm::vec3(camera.GetViewMatrix() * glm::vec4(lightPos, 1.0));
glUniform3fv(glGetUniformLocation(shaderLightingPass.Program, "light.Position"), 1, &lightPosView[0]);
glUniform3fv(glGetUniformLocation(shaderLightingPass.Program, "light.Color"), 1, &lightColor[0]);
// Update attenuation parameters
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 = 0.09;
const GLfloat quadratic = 0.032;
glUniform1f(glGetUniformLocation(shaderLightingPass.Program, "light.Linear"), linear);
glUniform1f(glGetUniformLocation(shaderLightingPass.Program, "light.Quadratic"), quadratic);
glUniform1i(glGetUniformLocation(shaderLightingPass.Program, "draw_mode"), draw_mode);
RenderQuad();
// Swap the buffers
@@ -210,63 +306,162 @@ int main()
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* path)
// RenderQuad() Renders a 1x1 quad in NDC, best used for framebuffer color targets
// and post-processing effects.
GLuint quadVAO = 0;
GLuint quadVBO;
void RenderQuad()
{
//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;
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);
}
#pragma region "User input"
// 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])
if (keys[GLFW_KEY_W])
camera.ProcessKeyboard(FORWARD, deltaTime);
if(keys[GLFW_KEY_S])
if (keys[GLFW_KEY_S])
camera.ProcessKeyboard(BACKWARD, deltaTime);
if(keys[GLFW_KEY_A])
if (keys[GLFW_KEY_A])
camera.ProcessKeyboard(LEFT, deltaTime);
if(keys[GLFW_KEY_D])
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;
}
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)
if (key == GLFW_KEY_ESCAPE && action == GLFW_PRESS)
glfwSetWindowShouldClose(window, GL_TRUE);
if(action == GLFW_PRESS)
keys[key] = true;
else if(action == GLFW_RELEASE)
keys[key] = false;
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)
if (firstMouse)
{
lastX = xpos;
lastY = ypos;
@@ -274,17 +469,15 @@ void mouse_callback(GLFWwindow* window, double xpos, double ypos)
}
GLfloat xoffset = xpos - lastX;
GLfloat yoffset = lastY - ypos;
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
}

60
src/5.advanced_lighting/9.ssao/ssao.frag
View File

@@ -1,16 +1,54 @@
#version 330 core
out vec4 color;
out float FragColor;
in vec2 TexCoords;
float LinearizeDepth(float depth) // Note that this ranges from [0,1] instead of up to 'far plane distance' since we divide by 'far'
{
float near = 0.1;
float far = 100.0;
float z = depth * 2.0 - 1.0; // Back to NDC
return (2.0 * near) / (far + near - z * (far - near));
}
uniform sampler2D gPositionDepth;
uniform sampler2D gNormal;
uniform sampler2D texNoise;
uniform vec3 samples[64];
// parameters (you'd probably want to use them as uniforms to more easily tweak the effect)
int kernelSize = 64;
float radius = 1.0;
// tile noise texture over screen based on screen dimensions divided by noise size
const vec2 noiseScale = vec2(800.0f/4.0f, 600.0f/4.0f);
uniform mat4 projection;
void main()
{
float depth = LinearizeDepth(gl_FragCoord.z);
color = vec4(vec3(depth), 1.0f);
{
// Get input for SSAO algorithm
vec3 fragPos = texture(gPositionDepth, TexCoords).xyz;
vec3 normal = texture(gNormal, TexCoords).rgb;
vec3 randomVec = texture(texNoise, TexCoords * noiseScale).xyz;
// Create TBN change-of-basis matrix: from tangent-space to view-space
vec3 tangent = normalize(randomVec - normal * dot(randomVec, normal));
vec3 bitangent = cross(normal, tangent);
mat3 TBN = mat3(tangent, bitangent, normal);
// Iterate over the sample kernel and calculate occlusion factor
float occlusion = 0.0;
for(int i = 0; i < kernelSize; ++i)
{
// get sample position
vec3 sample = TBN * samples[i]; // From tangent to view-space
sample = fragPos + sample * radius;
// project sample position (to sample texture) (to get position on screen/texture)
vec4 offset = vec4(sample, 1.0);
offset = projection * offset; // from view to clip-space
offset.xyz /= offset.w; // perspective divide
offset.xyz = offset.xyz * 0.5 + 0.5; // transform to range 0.0 - 1.0
// get sample depth
float sampleDepth = -texture(gPositionDepth, offset.xy).w; // Get depth value of kernel sample
// range check & accumulate
float rangeCheck = smoothstep(0.0, 1.0, radius / abs(fragPos.z - sampleDepth ));
occlusion += (sampleDepth >= sample.z ? 1.0 : 0.0) * rangeCheck;
}
occlusion = 1.0 - (occlusion / kernelSize);
FragColor = occlusion;
}

6
src/5.advanced_lighting/9.ssao/ssao.vs
View File

@@ -4,12 +4,8 @@ layout (location = 1) in vec2 texCoords;
out vec2 TexCoords;
uniform mat4 model;
uniform mat4 view;
uniform mat4 projection;
void main()
{
gl_Position = projection * view * model * vec4(position, 1.0f);
gl_Position = vec4(position, 1.0f);
TexCoords = texCoords;
}

19
src/5.advanced_lighting/9.ssao/ssao_blur.frag Normal file
View File

@@ -0,0 +1,19 @@
#version 330 core
in vec2 TexCoords;
out float fragColor;
uniform sampler2D ssaoInput;
void main() {
vec2 texelSize = 1.0 / vec2(textureSize(ssaoInput, 0));
float result = 0.0;
for (int x = -2; x < 2; ++x)
{
for (int y = -2; y < 2; ++y)
{
vec2 offset = vec2(float(x), float(y)) * texelSize;
result += texture(ssaoInput, TexCoords + offset).r;
}
}
fragColor = result / (4.0 * 4.0);
}

28
src/5.advanced_lighting/9.ssao/ssao_geometry.frag Normal file
View File

@@ -0,0 +1,28 @@
#version 330 core
layout (location = 0) out vec4 gPositionDepth;
layout (location = 1) out vec3 gNormal;
layout (location = 2) out vec4 gAlbedoSpec;
in vec2 TexCoords;
in vec3 FragPos;
in vec3 Normal;
const float NEAR = 0.1;
const float FAR = 50.0f;
float LinearizeDepth(float depth)
{
float z = depth * 2.0 - 1.0; // Back to NDC
return (2.0 * NEAR * FAR) / (FAR + NEAR - z * (FAR - NEAR));
}
void main()
{
// Store the fragment position vector in the first gbuffer texture
gPositionDepth.xyz = FragPos;
// And store linear depth into gPositionDepth's alpha component
gPositionDepth.a = LinearizeDepth(gl_FragCoord.z); // Divide by far to store depth in range 0.0 - 1.0
// Also store the per-fragment normals into the gbuffer
gNormal = normalize(Normal);
// And the diffuse per-fragment color
gAlbedoSpec.rgb = vec3(0.95);
}

23
src/5.advanced_lighting/9.ssao/ssao_geometry.vs Normal file
View File

@@ -0,0 +1,23 @@
#version 330 core
layout (location = 0) in vec3 position;
layout (location = 1) in vec3 normal;
layout (location = 2) in vec2 texCoords;
out vec3 FragPos;
out vec2 TexCoords;
out vec3 Normal;
uniform mat4 model;
uniform mat4 view;
uniform mat4 projection;
void main()
{
vec4 viewPos = view * model * vec4(position, 1.0f);
FragPos = viewPos.xyz;
gl_Position = projection * viewPos;
TexCoords = texCoords;
mat3 normalMatrix = transpose(inverse(mat3(view * model)));
Normal = normalMatrix * normal;
}

59
src/5.advanced_lighting/9.ssao/ssao_lighting.frag Normal file
View File

@@ -0,0 +1,59 @@
#version 330 core
out vec4 FragColor;
in vec2 TexCoords;
uniform sampler2D gPositionDepth;
uniform sampler2D gNormal;
uniform sampler2D gAlbedo;
uniform sampler2D ssao;
struct Light {
vec3 Position;
vec3 Color;
float Linear;
float Quadratic;
float Radius;
};
uniform Light light;
uniform int draw_mode;
void main()
{
// Retrieve data from gbuffer
vec3 FragPos = texture(gPositionDepth, TexCoords).rgb;
vec3 Normal = texture(gNormal, TexCoords).rgb;
vec3 Diffuse = texture(gAlbedo, TexCoords).rgb;
float Depth = texture(gPositionDepth, TexCoords).a;
float AmbientOcclusion = texture(ssao, TexCoords).r;
// Then calculate lighting as usual
vec3 ambient = vec3(0.3 * AmbientOcclusion);
vec3 lighting = ambient;
vec3 viewDir = normalize(-FragPos); // Viewpos is (0.0.0)
// Diffuse
vec3 lightDir = normalize(light.Position - FragPos);
vec3 diffuse = max(dot(Normal, lightDir), 0.0) * Diffuse * light.Color;
// Specular
vec3 halfwayDir = normalize(lightDir + viewDir);
float spec = pow(max(dot(Normal, halfwayDir), 0.0), 8.0);
vec3 specular = light.Color * spec;
// Attenuation
float distance = length(light.Position - FragPos);
float attenuation = 1.0 / (1.0 + light.Linear * distance + light.Quadratic * distance * distance);
diffuse *= attenuation;
specular *= attenuation;
lighting += diffuse + specular;
// Based on which of the 1-5 keys we pressed, show specific buffer values
if(draw_mode == 1)
FragColor = vec4(lighting, 1.0);
else if(draw_mode == 2)
FragColor = vec4(vec3(Depth / 50.0), 1.0);
else if(draw_mode == 3)
FragColor = vec4(FragPos, 1.0);
else if(draw_mode == 3)
FragColor = vec4(Normal, 1.0);
else if(draw_mode == 4)
FragColor = vec4(vec3(AmbientOcclusion), 1.0);
}