mirror of
https://github.com/JoeyDeVries/LearnOpenGL.git
synced 2026-01-02 04:37:54 +08:00
697 lines
29 KiB
C++
697 lines
29 KiB
C++
#include <glad/glad.h>
|
|
#include <GLFW/glfw3.h>
|
|
#include <stb_image.h>
|
|
|
|
#include <glm/glm.hpp>
|
|
#include <glm/gtc/matrix_transform.hpp>
|
|
#include <glm/gtc/type_ptr.hpp>
|
|
|
|
#include <learnopengl/filesystem.h>
|
|
#include <learnopengl/shader.h>
|
|
#include <learnopengl/camera.h>
|
|
#include <learnopengl/model.h>
|
|
|
|
#include <iostream>
|
|
|
|
void framebuffer_size_callback(GLFWwindow* window, int width, int height);
|
|
void mouse_callback(GLFWwindow* window, double xpos, double ypos);
|
|
void scroll_callback(GLFWwindow* window, double xoffset, double yoffset);
|
|
void processInput(GLFWwindow *window);
|
|
void renderSphere();
|
|
void renderCube();
|
|
void renderQuad();
|
|
|
|
// settings
|
|
const unsigned int SCR_WIDTH = 1280;
|
|
const unsigned int SCR_HEIGHT = 720;
|
|
|
|
// camera
|
|
Camera camera(glm::vec3(0.0f, 0.0f, 3.0f));
|
|
float lastX = 800.0f / 2.0;
|
|
float lastY = 600.0 / 2.0;
|
|
bool firstMouse = true;
|
|
|
|
// timing
|
|
float deltaTime = 0.0f;
|
|
float lastFrame = 0.0f;
|
|
|
|
int main()
|
|
{
|
|
// glfw: initialize and configure
|
|
// ------------------------------
|
|
glfwInit();
|
|
glfwWindowHint(GLFW_CONTEXT_VERSION_MAJOR, 3);
|
|
glfwWindowHint(GLFW_CONTEXT_VERSION_MINOR, 3);
|
|
glfwWindowHint(GLFW_SAMPLES, 4);
|
|
glfwWindowHint(GLFW_OPENGL_PROFILE, GLFW_OPENGL_CORE_PROFILE);
|
|
|
|
#ifdef __APPLE__
|
|
glfwWindowHint(GLFW_OPENGL_FORWARD_COMPAT, GL_TRUE);
|
|
#endif
|
|
|
|
// glfw window creation
|
|
// --------------------
|
|
GLFWwindow* window = glfwCreateWindow(SCR_WIDTH, SCR_HEIGHT, "LearnOpenGL", NULL, NULL);
|
|
glfwMakeContextCurrent(window);
|
|
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);
|
|
|
|
// tell GLFW to capture our mouse
|
|
glfwSetInputMode(window, GLFW_CURSOR, GLFW_CURSOR_DISABLED);
|
|
|
|
// glad: load all OpenGL function pointers
|
|
// ---------------------------------------
|
|
if (!gladLoadGLLoader((GLADloadproc)glfwGetProcAddress))
|
|
{
|
|
std::cout << "Failed to initialize GLAD" << std::endl;
|
|
return -1;
|
|
}
|
|
|
|
// configure global opengl state
|
|
// -----------------------------
|
|
glEnable(GL_DEPTH_TEST);
|
|
// set depth function to less than AND equal for skybox depth trick.
|
|
glDepthFunc(GL_LEQUAL);
|
|
// enable seamless cubemap sampling for lower mip levels in the pre-filter map.
|
|
glEnable(GL_TEXTURE_CUBE_MAP_SEAMLESS);
|
|
|
|
// build and compile shaders
|
|
// -------------------------
|
|
Shader pbrShader("2.2.1.pbr.vs", "2.2.1.pbr.fs");
|
|
Shader equirectangularToCubemapShader("2.2.1.cubemap.vs", "2.2.1.equirectangular_to_cubemap.fs");
|
|
Shader irradianceShader("2.2.1.cubemap.vs", "2.2.1.irradiance_convolution.fs");
|
|
Shader prefilterShader("2.2.1.cubemap.vs", "2.2.1.prefilter.fs");
|
|
Shader brdfShader("2.2.1.brdf.vs", "2.2.1.brdf.fs");
|
|
Shader backgroundShader("2.2.1.background.vs", "2.2.1.background.fs");
|
|
|
|
pbrShader.use();
|
|
pbrShader.setInt("irradianceMap", 0);
|
|
pbrShader.setInt("prefilterMap", 1);
|
|
pbrShader.setInt("brdfLUT", 2);
|
|
pbrShader.setVec3("albedo", 0.5f, 0.0f, 0.0f);
|
|
pbrShader.setFloat("ao", 1.0f);
|
|
|
|
backgroundShader.use();
|
|
backgroundShader.setInt("environmentMap", 0);
|
|
|
|
|
|
// lights
|
|
// ------
|
|
glm::vec3 lightPositions[] = {
|
|
glm::vec3(-10.0f, 10.0f, 10.0f),
|
|
glm::vec3( 10.0f, 10.0f, 10.0f),
|
|
glm::vec3(-10.0f, -10.0f, 10.0f),
|
|
glm::vec3( 10.0f, -10.0f, 10.0f),
|
|
};
|
|
glm::vec3 lightColors[] = {
|
|
glm::vec3(300.0f, 300.0f, 300.0f),
|
|
glm::vec3(300.0f, 300.0f, 300.0f),
|
|
glm::vec3(300.0f, 300.0f, 300.0f),
|
|
glm::vec3(300.0f, 300.0f, 300.0f)
|
|
};
|
|
int nrRows = 7;
|
|
int nrColumns = 7;
|
|
float spacing = 2.5;
|
|
|
|
// pbr: setup framebuffer
|
|
// ----------------------
|
|
unsigned int captureFBO;
|
|
unsigned int captureRBO;
|
|
glGenFramebuffers(1, &captureFBO);
|
|
glGenRenderbuffers(1, &captureRBO);
|
|
|
|
glBindFramebuffer(GL_FRAMEBUFFER, captureFBO);
|
|
glBindRenderbuffer(GL_RENDERBUFFER, captureRBO);
|
|
glRenderbufferStorage(GL_RENDERBUFFER, GL_DEPTH_COMPONENT24, 512, 512);
|
|
glFramebufferRenderbuffer(GL_FRAMEBUFFER, GL_DEPTH_ATTACHMENT, GL_RENDERBUFFER, captureRBO);
|
|
|
|
// pbr: load the HDR environment map
|
|
// ---------------------------------
|
|
stbi_set_flip_vertically_on_load(true);
|
|
int width, height, nrComponents;
|
|
float *data = stbi_loadf(FileSystem::getPath("resources/textures/hdr/newport_loft.hdr").c_str(), &width, &height, &nrComponents, 0);
|
|
unsigned int hdrTexture;
|
|
if (data)
|
|
{
|
|
glGenTextures(1, &hdrTexture);
|
|
glBindTexture(GL_TEXTURE_2D, hdrTexture);
|
|
glTexImage2D(GL_TEXTURE_2D, 0, GL_RGB16F, width, height, 0, GL_RGB, GL_FLOAT, data); // note how we specify the texture's data value to be float
|
|
|
|
glTexParameteri(GL_TEXTURE_2D, GL_TEXTURE_WRAP_S, GL_CLAMP_TO_EDGE);
|
|
glTexParameteri(GL_TEXTURE_2D, GL_TEXTURE_WRAP_T, GL_CLAMP_TO_EDGE);
|
|
glTexParameteri(GL_TEXTURE_2D, GL_TEXTURE_MIN_FILTER, GL_LINEAR);
|
|
glTexParameteri(GL_TEXTURE_2D, GL_TEXTURE_MAG_FILTER, GL_LINEAR);
|
|
|
|
stbi_image_free(data);
|
|
}
|
|
else
|
|
{
|
|
std::cout << "Failed to load HDR image." << std::endl;
|
|
}
|
|
|
|
// pbr: setup cubemap to render to and attach to framebuffer
|
|
// ---------------------------------------------------------
|
|
unsigned int envCubemap;
|
|
glGenTextures(1, &envCubemap);
|
|
glBindTexture(GL_TEXTURE_CUBE_MAP, envCubemap);
|
|
for (unsigned int i = 0; i < 6; ++i)
|
|
{
|
|
glTexImage2D(GL_TEXTURE_CUBE_MAP_POSITIVE_X + i, 0, GL_RGB16F, 512, 512, 0, GL_RGB, GL_FLOAT, nullptr);
|
|
}
|
|
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);
|
|
glTexParameteri(GL_TEXTURE_CUBE_MAP, GL_TEXTURE_MIN_FILTER, GL_LINEAR_MIPMAP_LINEAR); // enable pre-filter mipmap sampling (combatting visible dots artifact)
|
|
glTexParameteri(GL_TEXTURE_CUBE_MAP, GL_TEXTURE_MAG_FILTER, GL_LINEAR);
|
|
|
|
// pbr: set up projection and view matrices for capturing data onto the 6 cubemap face directions
|
|
// ----------------------------------------------------------------------------------------------
|
|
glm::mat4 captureProjection = glm::perspective(glm::radians(90.0f), 1.0f, 0.1f, 10.0f);
|
|
glm::mat4 captureViews[] =
|
|
{
|
|
glm::lookAt(glm::vec3(0.0f, 0.0f, 0.0f), glm::vec3(1.0f, 0.0f, 0.0f), glm::vec3(0.0f, -1.0f, 0.0f)),
|
|
glm::lookAt(glm::vec3(0.0f, 0.0f, 0.0f), glm::vec3(-1.0f, 0.0f, 0.0f), glm::vec3(0.0f, -1.0f, 0.0f)),
|
|
glm::lookAt(glm::vec3(0.0f, 0.0f, 0.0f), glm::vec3(0.0f, 1.0f, 0.0f), glm::vec3(0.0f, 0.0f, 1.0f)),
|
|
glm::lookAt(glm::vec3(0.0f, 0.0f, 0.0f), glm::vec3(0.0f, -1.0f, 0.0f), glm::vec3(0.0f, 0.0f, -1.0f)),
|
|
glm::lookAt(glm::vec3(0.0f, 0.0f, 0.0f), glm::vec3(0.0f, 0.0f, 1.0f), glm::vec3(0.0f, -1.0f, 0.0f)),
|
|
glm::lookAt(glm::vec3(0.0f, 0.0f, 0.0f), glm::vec3(0.0f, 0.0f, -1.0f), glm::vec3(0.0f, -1.0f, 0.0f))
|
|
};
|
|
|
|
// pbr: convert HDR equirectangular environment map to cubemap equivalent
|
|
// ----------------------------------------------------------------------
|
|
equirectangularToCubemapShader.use();
|
|
equirectangularToCubemapShader.setInt("equirectangularMap", 0);
|
|
equirectangularToCubemapShader.setMat4("projection", captureProjection);
|
|
glActiveTexture(GL_TEXTURE0);
|
|
glBindTexture(GL_TEXTURE_2D, hdrTexture);
|
|
|
|
glViewport(0, 0, 512, 512); // don't forget to configure the viewport to the capture dimensions.
|
|
glBindFramebuffer(GL_FRAMEBUFFER, captureFBO);
|
|
for (unsigned int i = 0; i < 6; ++i)
|
|
{
|
|
equirectangularToCubemapShader.setMat4("view", captureViews[i]);
|
|
glFramebufferTexture2D(GL_FRAMEBUFFER, GL_COLOR_ATTACHMENT0, GL_TEXTURE_CUBE_MAP_POSITIVE_X + i, envCubemap, 0);
|
|
glClear(GL_COLOR_BUFFER_BIT | GL_DEPTH_BUFFER_BIT);
|
|
|
|
renderCube();
|
|
}
|
|
glBindFramebuffer(GL_FRAMEBUFFER, 0);
|
|
|
|
// then let OpenGL generate mipmaps from first mip face (combatting visible dots artifact)
|
|
glBindTexture(GL_TEXTURE_CUBE_MAP, envCubemap);
|
|
glGenerateMipmap(GL_TEXTURE_CUBE_MAP);
|
|
|
|
// pbr: create an irradiance cubemap, and re-scale capture FBO to irradiance scale.
|
|
// --------------------------------------------------------------------------------
|
|
unsigned int irradianceMap;
|
|
glGenTextures(1, &irradianceMap);
|
|
glBindTexture(GL_TEXTURE_CUBE_MAP, irradianceMap);
|
|
for (unsigned int i = 0; i < 6; ++i)
|
|
{
|
|
glTexImage2D(GL_TEXTURE_CUBE_MAP_POSITIVE_X + i, 0, GL_RGB16F, 32, 32, 0, GL_RGB, GL_FLOAT, nullptr);
|
|
}
|
|
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);
|
|
glTexParameteri(GL_TEXTURE_CUBE_MAP, GL_TEXTURE_MIN_FILTER, GL_LINEAR);
|
|
glTexParameteri(GL_TEXTURE_CUBE_MAP, GL_TEXTURE_MAG_FILTER, GL_LINEAR);
|
|
|
|
glBindFramebuffer(GL_FRAMEBUFFER, captureFBO);
|
|
glBindRenderbuffer(GL_RENDERBUFFER, captureRBO);
|
|
glRenderbufferStorage(GL_RENDERBUFFER, GL_DEPTH_COMPONENT24, 32, 32);
|
|
|
|
// pbr: solve diffuse integral by convolution to create an irradiance (cube)map.
|
|
// -----------------------------------------------------------------------------
|
|
irradianceShader.use();
|
|
irradianceShader.setInt("environmentMap", 0);
|
|
irradianceShader.setMat4("projection", captureProjection);
|
|
glActiveTexture(GL_TEXTURE0);
|
|
glBindTexture(GL_TEXTURE_CUBE_MAP, envCubemap);
|
|
|
|
glViewport(0, 0, 32, 32); // don't forget to configure the viewport to the capture dimensions.
|
|
glBindFramebuffer(GL_FRAMEBUFFER, captureFBO);
|
|
for (unsigned int i = 0; i < 6; ++i)
|
|
{
|
|
irradianceShader.setMat4("view", captureViews[i]);
|
|
glFramebufferTexture2D(GL_FRAMEBUFFER, GL_COLOR_ATTACHMENT0, GL_TEXTURE_CUBE_MAP_POSITIVE_X + i, irradianceMap, 0);
|
|
glClear(GL_COLOR_BUFFER_BIT | GL_DEPTH_BUFFER_BIT);
|
|
|
|
renderCube();
|
|
}
|
|
glBindFramebuffer(GL_FRAMEBUFFER, 0);
|
|
|
|
// pbr: create a pre-filter cubemap, and re-scale capture FBO to pre-filter scale.
|
|
// --------------------------------------------------------------------------------
|
|
unsigned int prefilterMap;
|
|
glGenTextures(1, &prefilterMap);
|
|
glBindTexture(GL_TEXTURE_CUBE_MAP, prefilterMap);
|
|
for (unsigned int i = 0; i < 6; ++i)
|
|
{
|
|
glTexImage2D(GL_TEXTURE_CUBE_MAP_POSITIVE_X + i, 0, GL_RGB16F, 128, 128, 0, GL_RGB, GL_FLOAT, nullptr);
|
|
}
|
|
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);
|
|
glTexParameteri(GL_TEXTURE_CUBE_MAP, GL_TEXTURE_MIN_FILTER, GL_LINEAR_MIPMAP_LINEAR); // be sure to set minification filter to mip_linear
|
|
glTexParameteri(GL_TEXTURE_CUBE_MAP, GL_TEXTURE_MAG_FILTER, GL_LINEAR);
|
|
// generate mipmaps for the cubemap so OpenGL automatically allocates the required memory.
|
|
glGenerateMipmap(GL_TEXTURE_CUBE_MAP);
|
|
|
|
// pbr: run a quasi monte-carlo simulation on the environment lighting to create a prefilter (cube)map.
|
|
// ----------------------------------------------------------------------------------------------------
|
|
prefilterShader.use();
|
|
prefilterShader.setInt("environmentMap", 0);
|
|
prefilterShader.setMat4("projection", captureProjection);
|
|
glActiveTexture(GL_TEXTURE0);
|
|
glBindTexture(GL_TEXTURE_CUBE_MAP, envCubemap);
|
|
|
|
glBindFramebuffer(GL_FRAMEBUFFER, captureFBO);
|
|
unsigned int maxMipLevels = 5;
|
|
for (unsigned int mip = 0; mip < maxMipLevels; ++mip)
|
|
{
|
|
// reisze framebuffer according to mip-level size.
|
|
unsigned int mipWidth = 128 * std::pow(0.5, mip);
|
|
unsigned int mipHeight = 128 * std::pow(0.5, mip);
|
|
glBindRenderbuffer(GL_RENDERBUFFER, captureRBO);
|
|
glRenderbufferStorage(GL_RENDERBUFFER, GL_DEPTH_COMPONENT24, mipWidth, mipHeight);
|
|
glViewport(0, 0, mipWidth, mipHeight);
|
|
|
|
float roughness = (float)mip / (float)(maxMipLevels - 1);
|
|
prefilterShader.setFloat("roughness", roughness);
|
|
for (unsigned int i = 0; i < 6; ++i)
|
|
{
|
|
prefilterShader.setMat4("view", captureViews[i]);
|
|
glFramebufferTexture2D(GL_FRAMEBUFFER, GL_COLOR_ATTACHMENT0, GL_TEXTURE_CUBE_MAP_POSITIVE_X + i, prefilterMap, mip);
|
|
|
|
glClear(GL_COLOR_BUFFER_BIT | GL_DEPTH_BUFFER_BIT);
|
|
renderCube();
|
|
}
|
|
}
|
|
glBindFramebuffer(GL_FRAMEBUFFER, 0);
|
|
|
|
// pbr: generate a 2D LUT from the BRDF equations used.
|
|
// ----------------------------------------------------
|
|
unsigned int brdfLUTTexture;
|
|
glGenTextures(1, &brdfLUTTexture);
|
|
|
|
// pre-allocate enough memory for the LUT texture.
|
|
glBindTexture(GL_TEXTURE_2D, brdfLUTTexture);
|
|
glTexImage2D(GL_TEXTURE_2D, 0, GL_RG16F, 512, 512, 0, GL_RG, GL_FLOAT, 0);
|
|
// be sure to set wrapping mode to GL_CLAMP_TO_EDGE
|
|
glTexParameteri(GL_TEXTURE_2D, GL_TEXTURE_WRAP_S, GL_CLAMP_TO_EDGE);
|
|
glTexParameteri(GL_TEXTURE_2D, GL_TEXTURE_WRAP_T, GL_CLAMP_TO_EDGE);
|
|
glTexParameteri(GL_TEXTURE_2D, GL_TEXTURE_MIN_FILTER, GL_LINEAR);
|
|
glTexParameteri(GL_TEXTURE_2D, GL_TEXTURE_MAG_FILTER, GL_LINEAR);
|
|
|
|
// then re-configure capture framebuffer object and render screen-space quad with BRDF shader.
|
|
glBindFramebuffer(GL_FRAMEBUFFER, captureFBO);
|
|
glBindRenderbuffer(GL_RENDERBUFFER, captureRBO);
|
|
glRenderbufferStorage(GL_RENDERBUFFER, GL_DEPTH_COMPONENT24, 512, 512);
|
|
glFramebufferTexture2D(GL_FRAMEBUFFER, GL_COLOR_ATTACHMENT0, GL_TEXTURE_2D, brdfLUTTexture, 0);
|
|
|
|
glViewport(0, 0, 512, 512);
|
|
brdfShader.use();
|
|
glClear(GL_COLOR_BUFFER_BIT | GL_DEPTH_BUFFER_BIT);
|
|
renderQuad();
|
|
|
|
glBindFramebuffer(GL_FRAMEBUFFER, 0);
|
|
|
|
|
|
// initialize static shader uniforms before rendering
|
|
// --------------------------------------------------
|
|
glm::mat4 projection = glm::perspective(glm::radians(camera.Zoom), (float)SCR_WIDTH / (float)SCR_HEIGHT, 0.1f, 100.0f);
|
|
pbrShader.use();
|
|
pbrShader.setMat4("projection", projection);
|
|
backgroundShader.use();
|
|
backgroundShader.setMat4("projection", projection);
|
|
|
|
// then before rendering, configure the viewport to the original framebuffer's screen dimensions
|
|
int scrWidth, scrHeight;
|
|
glfwGetFramebufferSize(window, &scrWidth, &scrHeight);
|
|
glViewport(0, 0, scrWidth, scrHeight);
|
|
|
|
// render loop
|
|
// -----------
|
|
while (!glfwWindowShouldClose(window))
|
|
{
|
|
// per-frame time logic
|
|
// --------------------
|
|
float currentFrame = glfwGetTime();
|
|
deltaTime = currentFrame - lastFrame;
|
|
lastFrame = currentFrame;
|
|
|
|
// input
|
|
// -----
|
|
processInput(window);
|
|
|
|
// render
|
|
// ------
|
|
glClearColor(0.2f, 0.3f, 0.3f, 1.0f);
|
|
glClear(GL_COLOR_BUFFER_BIT | GL_DEPTH_BUFFER_BIT);
|
|
|
|
// render scene, supplying the convoluted irradiance map to the final shader.
|
|
// ------------------------------------------------------------------------------------------
|
|
pbrShader.use();
|
|
glm::mat4 view = camera.GetViewMatrix();
|
|
pbrShader.setMat4("view", view);
|
|
pbrShader.setVec3("camPos", camera.Position);
|
|
|
|
// bind pre-computed IBL data
|
|
glActiveTexture(GL_TEXTURE0);
|
|
glBindTexture(GL_TEXTURE_CUBE_MAP, irradianceMap);
|
|
glActiveTexture(GL_TEXTURE1);
|
|
glBindTexture(GL_TEXTURE_CUBE_MAP, prefilterMap);
|
|
glActiveTexture(GL_TEXTURE2);
|
|
glBindTexture(GL_TEXTURE_2D, brdfLUTTexture);
|
|
|
|
// render rows*column number of spheres with varying metallic/roughness values scaled by rows and columns respectively
|
|
glm::mat4 model = glm::mat4(1.0f);
|
|
for (int row = 0; row < nrRows; ++row)
|
|
{
|
|
pbrShader.setFloat("metallic", (float)row / (float)nrRows);
|
|
for (int col = 0; col < nrColumns; ++col)
|
|
{
|
|
// we clamp the roughness to 0.025 - 1.0 as perfectly smooth surfaces (roughness of 0.0) tend to look a bit off
|
|
// on direct lighting.
|
|
pbrShader.setFloat("roughness", glm::clamp((float)col / (float)nrColumns, 0.05f, 1.0f));
|
|
|
|
model = glm::mat4(1.0f);
|
|
model = glm::translate(model, glm::vec3(
|
|
(float)(col - (nrColumns / 2)) * spacing,
|
|
(float)(row - (nrRows / 2)) * spacing,
|
|
-2.0f
|
|
));
|
|
pbrShader.setMat4("model", model);
|
|
renderSphere();
|
|
}
|
|
}
|
|
|
|
|
|
// render light source (simply re-render sphere at light positions)
|
|
// this looks a bit off as we use the same shader, but it'll make their positions obvious and
|
|
// keeps the codeprint small.
|
|
for (unsigned int i = 0; i < sizeof(lightPositions) / sizeof(lightPositions[0]); ++i)
|
|
{
|
|
glm::vec3 newPos = lightPositions[i] + glm::vec3(sin(glfwGetTime() * 5.0) * 5.0, 0.0, 0.0);
|
|
newPos = lightPositions[i];
|
|
pbrShader.setVec3("lightPositions[" + std::to_string(i) + "]", newPos);
|
|
pbrShader.setVec3("lightColors[" + std::to_string(i) + "]", lightColors[i]);
|
|
|
|
model = glm::mat4(1.0f);
|
|
model = glm::translate(model, newPos);
|
|
model = glm::scale(model, glm::vec3(0.5f));
|
|
pbrShader.setMat4("model", model);
|
|
renderSphere();
|
|
}
|
|
|
|
// render skybox (render as last to prevent overdraw)
|
|
backgroundShader.use();
|
|
backgroundShader.setMat4("view", view);
|
|
glActiveTexture(GL_TEXTURE0);
|
|
glBindTexture(GL_TEXTURE_CUBE_MAP, envCubemap);
|
|
//glBindTexture(GL_TEXTURE_CUBE_MAP, irradianceMap); // display irradiance map
|
|
//glBindTexture(GL_TEXTURE_CUBE_MAP, prefilterMap); // display prefilter map
|
|
renderCube();
|
|
|
|
|
|
// render BRDF map to screen
|
|
//brdfShader.Use();
|
|
//renderQuad();
|
|
|
|
|
|
// glfw: swap buffers and poll IO events (keys pressed/released, mouse moved etc.)
|
|
// -------------------------------------------------------------------------------
|
|
glfwSwapBuffers(window);
|
|
glfwPollEvents();
|
|
}
|
|
|
|
// glfw: terminate, clearing all previously allocated GLFW resources.
|
|
// ------------------------------------------------------------------
|
|
glfwTerminate();
|
|
return 0;
|
|
}
|
|
|
|
// process all input: query GLFW whether relevant keys are pressed/released this frame and react accordingly
|
|
// ---------------------------------------------------------------------------------------------------------
|
|
void processInput(GLFWwindow *window)
|
|
{
|
|
if (glfwGetKey(window, GLFW_KEY_ESCAPE) == GLFW_PRESS)
|
|
glfwSetWindowShouldClose(window, true);
|
|
|
|
if (glfwGetKey(window, GLFW_KEY_W) == GLFW_PRESS)
|
|
camera.ProcessKeyboard(FORWARD, deltaTime);
|
|
if (glfwGetKey(window, GLFW_KEY_S) == GLFW_PRESS)
|
|
camera.ProcessKeyboard(BACKWARD, deltaTime);
|
|
if (glfwGetKey(window, GLFW_KEY_A) == GLFW_PRESS)
|
|
camera.ProcessKeyboard(LEFT, deltaTime);
|
|
if (glfwGetKey(window, GLFW_KEY_D) == GLFW_PRESS)
|
|
camera.ProcessKeyboard(RIGHT, deltaTime);
|
|
}
|
|
|
|
// 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)
|
|
{
|
|
lastX = xpos;
|
|
lastY = ypos;
|
|
firstMouse = false;
|
|
}
|
|
|
|
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);
|
|
}
|
|
|
|
// renders (and builds at first invocation) a sphere
|
|
// -------------------------------------------------
|
|
unsigned int sphereVAO = 0;
|
|
unsigned int indexCount;
|
|
void renderSphere()
|
|
{
|
|
if (sphereVAO == 0)
|
|
{
|
|
glGenVertexArrays(1, &sphereVAO);
|
|
|
|
unsigned int vbo, ebo;
|
|
glGenBuffers(1, &vbo);
|
|
glGenBuffers(1, &ebo);
|
|
|
|
std::vector<glm::vec3> positions;
|
|
std::vector<glm::vec2> uv;
|
|
std::vector<glm::vec3> normals;
|
|
std::vector<unsigned int> indices;
|
|
|
|
const unsigned int X_SEGMENTS = 64;
|
|
const unsigned int Y_SEGMENTS = 64;
|
|
const float PI = 3.14159265359;
|
|
for (unsigned int x = 0; x <= X_SEGMENTS; ++x)
|
|
{
|
|
for (unsigned int y = 0; y <= Y_SEGMENTS; ++y)
|
|
{
|
|
float xSegment = (float)x / (float)X_SEGMENTS;
|
|
float ySegment = (float)y / (float)Y_SEGMENTS;
|
|
float xPos = std::cos(xSegment * 2.0f * PI) * std::sin(ySegment * PI);
|
|
float yPos = std::cos(ySegment * PI);
|
|
float zPos = std::sin(xSegment * 2.0f * PI) * std::sin(ySegment * PI);
|
|
|
|
positions.push_back(glm::vec3(xPos, yPos, zPos));
|
|
uv.push_back(glm::vec2(xSegment, ySegment));
|
|
normals.push_back(glm::vec3(xPos, yPos, zPos));
|
|
}
|
|
}
|
|
|
|
bool oddRow = false;
|
|
for (unsigned int y = 0; y < Y_SEGMENTS; ++y)
|
|
{
|
|
if (!oddRow) // even rows: y == 0, y == 2; and so on
|
|
{
|
|
for (unsigned int x = 0; x <= X_SEGMENTS; ++x)
|
|
{
|
|
indices.push_back(y * (X_SEGMENTS + 1) + x);
|
|
indices.push_back((y + 1) * (X_SEGMENTS + 1) + x);
|
|
}
|
|
}
|
|
else
|
|
{
|
|
for (int x = X_SEGMENTS; x >= 0; --x)
|
|
{
|
|
indices.push_back((y + 1) * (X_SEGMENTS + 1) + x);
|
|
indices.push_back(y * (X_SEGMENTS + 1) + x);
|
|
}
|
|
}
|
|
oddRow = !oddRow;
|
|
}
|
|
indexCount = indices.size();
|
|
|
|
std::vector<float> data;
|
|
for (unsigned int i = 0; i < positions.size(); ++i)
|
|
{
|
|
data.push_back(positions[i].x);
|
|
data.push_back(positions[i].y);
|
|
data.push_back(positions[i].z);
|
|
if (normals.size() > 0)
|
|
{
|
|
data.push_back(normals[i].x);
|
|
data.push_back(normals[i].y);
|
|
data.push_back(normals[i].z);
|
|
}
|
|
if (uv.size() > 0)
|
|
{
|
|
data.push_back(uv[i].x);
|
|
data.push_back(uv[i].y);
|
|
}
|
|
}
|
|
glBindVertexArray(sphereVAO);
|
|
glBindBuffer(GL_ARRAY_BUFFER, vbo);
|
|
glBufferData(GL_ARRAY_BUFFER, data.size() * sizeof(float), &data[0], GL_STATIC_DRAW);
|
|
glBindBuffer(GL_ELEMENT_ARRAY_BUFFER, ebo);
|
|
glBufferData(GL_ELEMENT_ARRAY_BUFFER, indices.size() * sizeof(unsigned int), &indices[0], GL_STATIC_DRAW);
|
|
unsigned int stride = (3 + 2 + 3) * sizeof(float);
|
|
glEnableVertexAttribArray(0);
|
|
glVertexAttribPointer(0, 3, GL_FLOAT, GL_FALSE, stride, (void*)0);
|
|
glEnableVertexAttribArray(1);
|
|
glVertexAttribPointer(1, 3, GL_FLOAT, GL_FALSE, stride, (void*)(3 * sizeof(float)));
|
|
glEnableVertexAttribArray(2);
|
|
glVertexAttribPointer(2, 2, GL_FLOAT, GL_FALSE, stride, (void*)(6 * sizeof(float)));
|
|
}
|
|
|
|
glBindVertexArray(sphereVAO);
|
|
glDrawElements(GL_TRIANGLE_STRIP, indexCount, GL_UNSIGNED_INT, 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 XY quad in NDC
|
|
// -----------------------------------------
|
|
unsigned int quadVAO = 0;
|
|
unsigned int quadVBO;
|
|
void renderQuad()
|
|
{
|
|
if (quadVAO == 0)
|
|
{
|
|
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
|
|
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(float), (void*)0);
|
|
glEnableVertexAttribArray(1);
|
|
glVertexAttribPointer(1, 2, GL_FLOAT, GL_FALSE, 5 * sizeof(float), (void*)(3 * sizeof(float)));
|
|
}
|
|
glBindVertexArray(quadVAO);
|
|
glDrawArrays(GL_TRIANGLE_STRIP, 0, 4);
|
|
glBindVertexArray(0);
|
|
}
|