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Code re-work: HDR

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This commit is contained in:
Joey de Vries
2017-04-23 22:43:48 +02:00
parent 7dc79cd5fa
commit 20d5811d61
9 changed files with 332 additions and 279 deletions
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3
src/5.advanced_lighting/4.normal_mapping/normal_mapping.cpp
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@@ -145,7 +145,8 @@ int main()
return 0;
}
// renderQuad() renders a 1x1 quad in NDC
// renders a 1x1 quad in NDC with manually calculated tangent vectors
// ------------------------------------------------------------------
unsigned int quadVAO = 0;
unsigned int quadVBO;
void renderQuad()

3
src/5.advanced_lighting/5.1.parallax_mapping/parallax_mapping.cpp
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@@ -155,7 +155,8 @@ int main()
return 0;
}
// renderQuad() renders a 1x1 quad in NDC
// renders a 1x1 quad in NDC with manually calculated tangent vectors
// ------------------------------------------------------------------
unsigned int quadVAO = 0;
unsigned int quadVBO;
void renderQuad()

3
src/5.advanced_lighting/5.2.steep_parallax_mapping/steep_parallax_mapping.cpp
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@@ -155,7 +155,8 @@ int main()
return 0;
}
// renderQuad() renders a 1x1 quad in NDC
// renders a 1x1 quad in NDC with manually calculated tangent vectors
// ------------------------------------------------------------------
unsigned int quadVAO = 0;
unsigned int quadVBO;
void renderQuad()

3
src/5.advanced_lighting/5.3.parallax_occlusion_mapping/parallax_occlusion_mapping.cpp
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@@ -155,7 +155,8 @@ int main()
return 0;
}
// renderQuad() renders a 1x1 quad in NDC
// renders a 1x1 quad in NDC with manually calculated tangent vectors
// ------------------------------------------------------------------
unsigned int quadVAO = 0;
unsigned int quadVBO;
void renderQuad()

7
src/5.advanced_lighting/6.hdr/6.hdr.fs
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@@ -1,5 +1,6 @@
#version 330 core
out vec4 color;
out vec4 FragColor;
in vec2 TexCoords;
uniform sampler2D hdrBuffer;
@@ -18,11 +19,11 @@ void main()
vec3 result = vec3(1.0) - exp(-hdrColor * exposure);
// also gamma correct while we're at it
result = pow(result, vec3(1.0 / gamma));
color = vec4(result, 1.0f);
FragColor = vec4(result, 1.0);
}
else
{
vec3 result = pow(hdrColor, vec3(1.0 / gamma));
color = vec4(result, 1.0);
FragColor = vec4(result, 1.0);
}
}

8
src/5.advanced_lighting/6.hdr/6.hdr.vs
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@@ -1,11 +1,11 @@
#version 330 core
layout (location = 0) in vec3 position;
layout (location = 1) in vec2 texCoords;
layout (location = 0) in vec3 aPos;
layout (location = 1) in vec2 aTexCoords;
out vec2 TexCoords;
void main()
{
gl_Position = vec4(position, 1.0f);
TexCoords = texCoords;
TexCoords = aTexCoords;
gl_Position = vec4(aPos, 1.0);
}

12
src/5.advanced_lighting/6.hdr/6.lighting.fs
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@@ -20,22 +20,22 @@ void main()
{
vec3 color = texture(diffuseTexture, fs_in.TexCoords).rgb;
vec3 normal = normalize(fs_in.Normal);
// Ambient
// ambient
vec3 ambient = 0.0 * color;
// Lighting
vec3 lighting = vec3(0.0f);
// lighting
vec3 lighting = vec3(0.0);
for(int i = 0; i < 16; i++)
{
// Diffuse
// diffuse
vec3 lightDir = normalize(lights[i].Position - fs_in.FragPos);
float diff = max(dot(lightDir, normal), 0.0);
vec3 diffuse = lights[i].Color * diff * color;
vec3 result = diffuse;
// Attenuation (use quadratic as we have gamma correction)
// attenuation (use quadratic as we have gamma correction)
float distance = length(fs_in.FragPos - lights[i].Position);
result *= 1.0 / (distance * distance);
lighting += result;
}
FragColor = vec4(ambient + lighting, 1.0f);
FragColor = vec4(ambient + lighting, 1.0);
}

15
src/5.advanced_lighting/6.hdr/6.lighting.vs
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@@ -1,7 +1,7 @@
#version 330 core
layout (location = 0) in vec3 position;
layout (location = 1) in vec3 normal;
layout (location = 2) in vec2 texCoords;
layout (location = 0) in vec3 aPos;
layout (location = 1) in vec3 aNormal;
layout (location = 2) in vec2 aTexCoords;
out VS_OUT {
vec3 FragPos;
@@ -17,12 +17,13 @@ uniform bool inverse_normals;
void main()
{
gl_Position = projection * view * model * vec4(position, 1.0f);
vs_out.FragPos = vec3(model * vec4(position, 1.0));
vs_out.TexCoords = texCoords;
vs_out.FragPos = vec3(model * vec4(aPos, 1.0));
vs_out.TexCoords = aTexCoords;
vec3 n = inverse_normals ? -normal : normal;
vec3 n = inverse_normals ? -aNormal : aNormal;
mat3 normalMatrix = transpose(inverse(mat3(model)));
vs_out.Normal = normalize(normalMatrix * n);
gl_Position = projection * view * model * vec4(aPos, 1.0);
}

543
src/5.advanced_lighting/6.hdr/hdr.cpp
View File

@@ -1,118 +1,114 @@
// 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.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 RenderScene(Shader &shader);
void RenderCube();
void RenderQuad();
void scroll_callback(GLFWwindow* window, double xoffset, double yoffset);
void processInput(GLFWwindow *window);
unsigned int loadTexture(const char *path, bool gammaCorrection);
void renderQuad();
void renderCube();
// Camera
// settings
const unsigned int SCR_WIDTH = 1280;
const unsigned int SCR_HEIGHT = 720;
bool hdr = true;
bool hdrKeyPressed = false;
float exposure = 0.1;
// camera
Camera camera(glm::vec3(0.0f, 0.0f, 5.0f));
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 hdr = true; // Change with 'Space'
GLfloat exposure = 1.0f; // Change with Q and E
// Global variables
GLuint woodTexture;
// 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);
// Setup and compile our shaders
Shader shader("lighting.vs", "lighting.frag");
Shader hdrShader("hdr.vs", "hdr.frag");
// build and compile shaders
// -------------------------
Shader shader("6.lighting.vs", "6.lighting.fs");
Shader hdrShader("6.hdr.vs", "6.hdr.fs");
// Light sources
// - Positions
std::vector<glm::vec3> lightPositions;
lightPositions.push_back(glm::vec3(0.0f, 0.0f, 49.5f)); // back light
lightPositions.push_back(glm::vec3(-1.4f, -1.9f, 9.0f));
lightPositions.push_back(glm::vec3(0.0f, -1.8f, 4.0f));
lightPositions.push_back(glm::vec3(0.8f, -1.7f, 6.0f));
// - Colors
std::vector<glm::vec3> lightColors;
lightColors.push_back(glm::vec3(200.0f, 200.0f, 200.0f));
lightColors.push_back(glm::vec3(0.1f, 0.0f, 0.0f));
lightColors.push_back(glm::vec3(0.0f, 0.0f, 0.2f));
lightColors.push_back(glm::vec3(0.0f, 0.1f, 0.0f));
// load textures
// -------------
unsigned int woodTexture = loadTexture(FileSystem::getPath("resources/textures/wood.png").c_str(), true); // note that we're loading the texture as an SRGB texture
// Load textures
woodTexture = loadTexture(FileSystem::getPath("resources/textures/wood.png").c_str());
// shader configuration
// --------------------
shader.use();
shader.setInt("diffuseTexture", 0);
hdrShader.use();
hdrShader.setInt("hdrBuffer", 0);
// Set up floating point framebuffer to render scene to
GLuint hdrFBO;
// configure floating point framebuffer
// ------------------------------------
unsigned int hdrFBO;
glGenFramebuffers(1, &hdrFBO);
// - Create floating point color buffer
GLuint colorBuffer;
// create floating point color buffer
unsigned int colorBuffer;
glGenTextures(1, &colorBuffer);
glBindTexture(GL_TEXTURE_2D, colorBuffer);
glTexImage2D(GL_TEXTURE_2D, 0, GL_RGBA16F, SCR_WIDTH, SCR_HEIGHT, 0, GL_RGBA, GL_FLOAT, NULL);
glTexParameteri(GL_TEXTURE_2D, GL_TEXTURE_MIN_FILTER, GL_LINEAR);
glTexParameteri(GL_TEXTURE_2D, GL_TEXTURE_MAG_FILTER, GL_LINEAR);
// - Create depth buffer (renderbuffer)
GLuint rboDepth;
// create depth buffer (renderbuffer)
unsigned int rboDepth;
glGenRenderbuffers(1, &rboDepth);
glBindRenderbuffer(GL_RENDERBUFFER, rboDepth);
glRenderbufferStorage(GL_RENDERBUFFER, GL_DEPTH_COMPONENT, SCR_WIDTH, SCR_HEIGHT);
// - Attach buffers
// attach buffers
glBindFramebuffer(GL_FRAMEBUFFER, hdrFBO);
glFramebufferTexture2D(GL_FRAMEBUFFER, GL_COLOR_ATTACHMENT0, GL_TEXTURE_2D, colorBuffer, 0);
glFramebufferRenderbuffer(GL_FRAMEBUFFER, GL_DEPTH_ATTACHMENT, GL_RENDERBUFFER, rboDepth);
@@ -120,246 +116,247 @@ int main()
std::cout << "Framebuffer not complete!" << std::endl;
glBindFramebuffer(GL_FRAMEBUFFER, 0);
glClearColor(0.1f, 0.1f, 0.1f, 1.0f);
// lighting info
// -------------
// positions
std::vector<glm::vec3> lightPositions;
lightPositions.push_back(glm::vec3( 0.0f, 0.0f, 49.5f)); // back light
lightPositions.push_back(glm::vec3(-1.4f, -1.9f, 9.0f));
lightPositions.push_back(glm::vec3( 0.0f, -1.8f, 4.0f));
lightPositions.push_back(glm::vec3( 0.8f, -1.7f, 6.0f));
// colors
std::vector<glm::vec3> lightColors;
lightColors.push_back(glm::vec3(200.0f, 200.0f, 200.0f));
lightColors.push_back(glm::vec3(0.1f, 0.0f, 0.0f));
lightColors.push_back(glm::vec3(0.0f, 0.0f, 0.2f));
lightColors.push_back(glm::vec3(0.0f, 0.1f, 0.0f));
// Game loop
// 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);
// 1. Render scene into floating point framebuffer
// render
// ------
glClearColor(0.1f, 0.1f, 0.1f, 1.0f);
glClear(GL_COLOR_BUFFER_BIT | GL_DEPTH_BUFFER_BIT);
// 1. render scene into floating point framebuffer
// -----------------------------------------------
glBindFramebuffer(GL_FRAMEBUFFER, hdrFBO);
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;
shader.Use();
glUniformMatrix4fv(glGetUniformLocation(shader.Program, "projection"), 1, GL_FALSE, glm::value_ptr(projection));
glUniformMatrix4fv(glGetUniformLocation(shader.Program, "view"), 1, GL_FALSE, glm::value_ptr(view));
shader.use();
shader.setMat4("projection", projection);
shader.setMat4("view", view);
glActiveTexture(GL_TEXTURE0);
glBindTexture(GL_TEXTURE_2D, woodTexture);
// - set lighting uniforms
for (GLuint i = 0; i < lightPositions.size(); i++)
// set lighting uniforms
for (unsigned int i = 0; i < lightPositions.size(); i++)
{
glUniform3fv(glGetUniformLocation(shader.Program, ("lights[" + std::to_string(i) + "].Position").c_str()), 1, &lightPositions[i][0]);
glUniform3fv(glGetUniformLocation(shader.Program, ("lights[" + std::to_string(i) + "].Color").c_str()), 1, &lightColors[i][0]);
shader.setVec3("lights[" + std::to_string(i) + "].Position", lightPositions[i]);
shader.setVec3("lights[" + std::to_string(i) + "].Color", lightColors[i]);
}
glUniform3fv(glGetUniformLocation(shader.Program, "viewPos"), 1, &camera.Position[0]);
// - render tunnel
model = glm::mat4();
shader.setVec3("viewPos", camera.Position);
// render tunnel
glm::mat4 model = glm::mat4();
model = glm::translate(model, glm::vec3(0.0f, 0.0f, 25.0));
model = glm::scale(model, glm::vec3(5.0f, 5.0f, 55.0f));
glUniformMatrix4fv(glGetUniformLocation(shader.Program, "model"), 1, GL_FALSE, glm::value_ptr(model));
glUniform1i(glGetUniformLocation(shader.Program, "inverse_normals"), GL_TRUE);
RenderCube();
model = glm::scale(model, glm::vec3(2.5f, 2.5f, 22.5f));
shader.setMat4("model", model);
shader.setInt("inverse_normals", true);
renderCube();
glBindFramebuffer(GL_FRAMEBUFFER, 0);
// 2. Now render floating point color buffer to 2D quad and tonemap HDR colors to default framebuffer's (clamped) color range
// 2. now render floating point color buffer to 2D quad and tonemap HDR colors to default framebuffer's (clamped) color range
// --------------------------------------------------------------------------------------------------------------------------
glClear(GL_COLOR_BUFFER_BIT | GL_DEPTH_BUFFER_BIT);
hdrShader.Use();
hdrShader.use();
glActiveTexture(GL_TEXTURE0);
glBindTexture(GL_TEXTURE_2D, colorBuffer);
glUniform1i(glGetUniformLocation(hdrShader.Program, "hdr"), hdr);
glUniform1f(glGetUniformLocation(hdrShader.Program, "exposure"), exposure);
RenderQuad();
hdrShader.setInt("hdr", hdr);
hdrShader.setFloat("exposure", exposure);
renderQuad();
std::cout << "exposure: " << exposure << std::endl;
std::cout << "hdr: " << (hdr ? "on" : "off") << "| exposure: " << exposure << std::endl;
// Swap the buffers
// glfw: swap buffers and poll IO events (keys pressed/released, mouse moved etc.)
// -------------------------------------------------------------------------------
glfwSwapBuffers(window);
glfwPollEvents();
}
glfwTerminate();
return 0;
}
// renderCube() renders a 1x1 3D cube in NDC.
// -------------------------------------------------
unsigned int cubeVAO = 0;
unsigned int cubeVBO = 0;
void renderCube()
{
// initialize (if necessary)
if (cubeVAO == 0)
{
float vertices[] = {
// back face
-1.0f, -1.0f, -1.0f, 0.0f, 0.0f, -1.0f, 0.0f, 0.0f, // bottom-left
1.0f, 1.0f, -1.0f, 0.0f, 0.0f, -1.0f, 1.0f, 1.0f, // top-right
1.0f, -1.0f, -1.0f, 0.0f, 0.0f, -1.0f, 1.0f, 0.0f, // bottom-right
1.0f, 1.0f, -1.0f, 0.0f, 0.0f, -1.0f, 1.0f, 1.0f, // top-right
-1.0f, -1.0f, -1.0f, 0.0f, 0.0f, -1.0f, 0.0f, 0.0f, // bottom-left
-1.0f, 1.0f, -1.0f, 0.0f, 0.0f, -1.0f, 0.0f, 1.0f, // top-left
// front face
-1.0f, -1.0f, 1.0f, 0.0f, 0.0f, 1.0f, 0.0f, 0.0f, // bottom-left
1.0f, -1.0f, 1.0f, 0.0f, 0.0f, 1.0f, 1.0f, 0.0f, // bottom-right
1.0f, 1.0f, 1.0f, 0.0f, 0.0f, 1.0f, 1.0f, 1.0f, // top-right
1.0f, 1.0f, 1.0f, 0.0f, 0.0f, 1.0f, 1.0f, 1.0f, // top-right
-1.0f, 1.0f, 1.0f, 0.0f, 0.0f, 1.0f, 0.0f, 1.0f, // top-left
-1.0f, -1.0f, 1.0f, 0.0f, 0.0f, 1.0f, 0.0f, 0.0f, // bottom-left
// left face
-1.0f, 1.0f, 1.0f, -1.0f, 0.0f, 0.0f, 1.0f, 0.0f, // top-right
-1.0f, 1.0f, -1.0f, -1.0f, 0.0f, 0.0f, 1.0f, 1.0f, // top-left
-1.0f, -1.0f, -1.0f, -1.0f, 0.0f, 0.0f, 0.0f, 1.0f, // bottom-left
-1.0f, -1.0f, -1.0f, -1.0f, 0.0f, 0.0f, 0.0f, 1.0f, // bottom-left
-1.0f, -1.0f, 1.0f, -1.0f, 0.0f, 0.0f, 0.0f, 0.0f, // bottom-right
-1.0f, 1.0f, 1.0f, -1.0f, 0.0f, 0.0f, 1.0f, 0.0f, // top-right
// right face
1.0f, 1.0f, 1.0f, 1.0f, 0.0f, 0.0f, 1.0f, 0.0f, // top-left
1.0f, -1.0f, -1.0f, 1.0f, 0.0f, 0.0f, 0.0f, 1.0f, // bottom-right
1.0f, 1.0f, -1.0f, 1.0f, 0.0f, 0.0f, 1.0f, 1.0f, // top-right
1.0f, -1.0f, -1.0f, 1.0f, 0.0f, 0.0f, 0.0f, 1.0f, // bottom-right
1.0f, 1.0f, 1.0f, 1.0f, 0.0f, 0.0f, 1.0f, 0.0f, // top-left
1.0f, -1.0f, 1.0f, 1.0f, 0.0f, 0.0f, 0.0f, 0.0f, // bottom-left
// bottom face
-1.0f, -1.0f, -1.0f, 0.0f, -1.0f, 0.0f, 0.0f, 1.0f, // top-right
1.0f, -1.0f, -1.0f, 0.0f, -1.0f, 0.0f, 1.0f, 1.0f, // top-left
1.0f, -1.0f, 1.0f, 0.0f, -1.0f, 0.0f, 1.0f, 0.0f, // bottom-left
1.0f, -1.0f, 1.0f, 0.0f, -1.0f, 0.0f, 1.0f, 0.0f, // bottom-left
-1.0f, -1.0f, 1.0f, 0.0f, -1.0f, 0.0f, 0.0f, 0.0f, // bottom-right
-1.0f, -1.0f, -1.0f, 0.0f, -1.0f, 0.0f, 0.0f, 1.0f, // top-right
// top face
-1.0f, 1.0f, -1.0f, 0.0f, 1.0f, 0.0f, 0.0f, 1.0f, // top-left
1.0f, 1.0f , 1.0f, 0.0f, 1.0f, 0.0f, 1.0f, 0.0f, // bottom-right
1.0f, 1.0f, -1.0f, 0.0f, 1.0f, 0.0f, 1.0f, 1.0f, // top-right
1.0f, 1.0f, 1.0f, 0.0f, 1.0f, 0.0f, 1.0f, 0.0f, // bottom-right
-1.0f, 1.0f, -1.0f, 0.0f, 1.0f, 0.0f, 0.0f, 1.0f, // top-left
-1.0f, 1.0f, 1.0f, 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(float), (void*)0);
glEnableVertexAttribArray(1);
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(float), (void*)(6 * sizeof(float)));
glBindBuffer(GL_ARRAY_BUFFER, 0);
glBindVertexArray(0);
}
// render Cube
glBindVertexArray(cubeVAO);
glDrawArrays(GL_TRIANGLES, 0, 36);
glBindVertexArray(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()
// renderQuad() renders a 1x1 XY quad in NDC
// -----------------------------------------
unsigned int quadVAO = 0;
unsigned int quadVBO;
void renderQuad()
{
if (quadVAO == 0)
{
GLfloat quadVertices[] = {
// Positions // Texture Coords
float 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
// 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);
glVertexAttribPointer(0, 3, GL_FLOAT, GL_FALSE, 5 * sizeof(float), (void*)0);
glEnableVertexAttribArray(1);
glVertexAttribPointer(1, 2, GL_FLOAT, GL_FALSE, 5 * sizeof(GLfloat), (GLvoid*)(3 * sizeof(GLfloat)));
glVertexAttribPointer(1, 2, GL_FLOAT, GL_FALSE, 5 * sizeof(float), (void*)(3 * sizeof(float)));
}
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()
// process all input: query GLFW whether relevant keys are pressed/released this frame and react accordingly
// ---------------------------------------------------------------------------------------------------------
void processInput(GLFWwindow *window)
{
// 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);
}
if (glfwGetKey(window, GLFW_KEY_ESCAPE) == GLFW_PRESS)
glfwSetWindowShouldClose(window, true);
// 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_SRGB, 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])
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_SPACE] && !keysPressed[GLFW_KEY_SPACE])
if (glfwGetKey(window, GLFW_KEY_SPACE) == GLFW_PRESS && !hdrKeyPressed)
{
hdr = !hdr;
keysPressed[GLFW_KEY_SPACE] = true;
hdrKeyPressed = true;
}
// Change exposure of the scene's HDR camera
if (keys[GLFW_KEY_Q])
exposure -= 0.5 * deltaTime;
else if (keys[GLFW_KEY_E])
exposure += 0.5 * deltaTime;
}
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 (glfwGetKey(window, GLFW_KEY_SPACE) == GLFW_RELEASE)
{
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;
hdrKeyPressed = false;
}
if (glfwGetKey(window, GLFW_KEY_Q) == GLFW_PRESS)
{
if (exposure > 0.0f)
exposure -= 0.001f;
else
exposure = 0.0f;
}
else if (glfwGetKey(window, GLFW_KEY_E) == GLFW_PRESS)
{
exposure += 0.001f;
}
}
// 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)
@@ -369,8 +366,8 @@ void mouse_callback(GLFWwindow* window, double xpos, double 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;
@@ -378,7 +375,57 @@ void mouse_callback(GLFWwindow* window, double xpos, double 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, bool gammaCorrection)
{
unsigned int textureID;
glGenTextures(1, &textureID);
int width, height, nrComponents;
unsigned char *data = stbi_load(path, &width, &height, &nrComponents, 0);
if (data)
{
GLenum internalFormat;
GLenum dataFormat;
if (nrComponents == 1)
{
internalFormat = dataFormat = GL_RED;
}
else if (nrComponents == 3)
{
internalFormat = gammaCorrection ? GL_SRGB : GL_RGB;
dataFormat = GL_RGB;
}
else if (nrComponents == 4)
{
internalFormat = gammaCorrection ? GL_SRGB_ALPHA : GL_RGBA;
dataFormat = GL_RGBA;
}
glBindTexture(GL_TEXTURE_2D, textureID);
glTexImage2D(GL_TEXTURE_2D, 0, internalFormat, width, height, 0, dataFormat, GL_UNSIGNED_BYTE, data);
glGenerateMipmap(GL_TEXTURE_2D);
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);
stbi_image_free(data);
}
else
{
std::cout << "Texture failed to load at path: " << path << std::endl;
stbi_image_free(data);
}
return textureID;
}