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main.cpp
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#include <iostream>
#include <time.h>
#include <cmath>
#include <GL/glew.h>
#include <GLFW/glfw3.h>
#include <imgui.h>
#include <imgui_impl_glfw_gl3.h>
#include <stb_image.h>
#include <glm.hpp>
#include <gtc/matrix_transform.hpp>
#include <gtc/type_ptr.hpp>
#include <gtx/vector_angle.hpp>
#include "src/BezierCurve.hpp"
#ifndef DEBUG
#define DEBUG 0
#endif
using namespace std;
using namespace glm;
// Font buffers
extern const unsigned char DroidSans_ttf[];
extern const unsigned int DroidSans_ttf_len;
// Shader utils
int check_link_error(GLuint program);
int check_compile_error(GLuint shader, const char ** sourceBuffer);
GLuint compile_shader(GLenum shaderType, const char * sourceBuffer, int bufferSize);
GLuint compile_shader_from_file(GLenum shaderType, const char * fileName);
// OpenGL utils
bool checkError(const char* title);
struct Camera
{
float radius;
float theta;
float phi;
vec3 o;
vec3 eye;
vec3 up;
};
void camera_compute(Camera & c);
void camera_defaults(Camera & c);
void camera_zoom(Camera & c, float factor);
void camera_turn(Camera & c, float phi, float theta);
void camera_pan(Camera & c, float x, float y);
float angleBetween(vec3 a, vec3 b, vec3 ref);
struct GUIStates
{
bool panLock;
bool turnLock;
bool zoomLock;
int lockPositionX;
int lockPositionY;
int camera;
double time;
bool playing;
static const float MOUSE_PAN_SPEED;
static const float MOUSE_ZOOM_SPEED;
static const float MOUSE_TURN_SPEED;
};
const float GUIStates::MOUSE_PAN_SPEED = 0.001f;
const float GUIStates::MOUSE_ZOOM_SPEED = 0.05f;
const float GUIStates::MOUSE_TURN_SPEED = 0.005f;
void init_gui_states(GUIStates & guiStates);
static void error_callback(int error, const char* description)
{
fputs(description, stderr);
}
static void key_callback(GLFWwindow* window, int key, int scancode, int action, int mods)
{
if (key == GLFW_KEY_ESCAPE && action == GLFW_PRESS)
glfwSetWindowShouldClose(window, GL_TRUE);
}
int main(void)
{
/******************
* Global Variables
*****************/
int width, height;
float currentTime;
int grid_size = 500;
int directionalLightCount = 1;
float directionalLightIntensity = 1.f;
vec3 directionalLightColor = vec3(1.f, 0.f, 0.f);
vec4 directionalLightDir = vec4(-1.0, -1.0, 0.0, 0.0);
vec3 sphereColor(1.f);
// Shading Grid
vec3 colorNear(0.91f, 0.41f, 0.19f);
vec3 colorFar(0.56f, 0.06f, 0.32f);
float brightness(100.f);
float attenuation(7.f);
// Fx
int sampleCount = 5;
float gamma = 1.2f;
/****************************
* Window Initialization GLFW
***************************/
GLFWwindow* window;
glfwSetErrorCallback(error_callback);
if (!glfwInit())
{
cerr << "Failed to initialize GLFW" << endl;
exit(EXIT_FAILURE);
}
GLFWmonitor* monitor = glfwGetPrimaryMonitor();
const GLFWvidmode* mode = glfwGetVideoMode(monitor);
glfwWindowHint(GLFW_RED_BITS, mode->redBits);
glfwWindowHint(GLFW_GREEN_BITS, mode->greenBits);
glfwWindowHint(GLFW_BLUE_BITS, mode->blueBits);
glfwWindowHint(GLFW_REFRESH_RATE, mode->refreshRate);
glfwWindowHint(GLFW_RESIZABLE, GL_FALSE);
glfwWindowHint(GLFW_DECORATED, GL_TRUE);
glfwWindowHint(GLFW_CLIENT_API, GLFW_OPENGL_API);
#if DEBUG
width = 1280;
height = 720;
window = glfwCreateWindow(width, height, "OpenGL project", NULL, NULL);
#else
width = mode->width;
height = mode->height;
window = glfwCreateWindow(width, height, "OpenGL project", monitor, NULL);
#endif
if (!window)
{
glfwTerminate();
exit(EXIT_FAILURE);
}
glfwMakeContextCurrent(window);
glfwSetKeyCallback(window, key_callback);
/*********************
* GLEW Initialization
*********************/
glewExperimental = GL_TRUE;
GLenum err = glewInit();
if (GLEW_OK != err) {
cerr << "Error: \n" << glewGetErrorString(err) << endl;
exit(EXIT_FAILURE);
}
/***********************
* ImGui Initialization
**********************/
ImGui_ImplGlfwGL3_Init(window, true);
float clearColor[]{0.f, 0.f, 0.f, 1.f};
/***********************
* Camera Initialization
**********************/
Camera camera;
camera_defaults(camera);
GUIStates guiStates;
init_gui_states(guiStates);
float focusPlane = 15.0;
float nearPlane = 1.0;
float farPlane = 50.0;
// Camera Path
unsigned int timer = unsigned(time(NULL));
BezierCurve bSmoother;
vector<vec3> cameraPath;
cameraPath.push_back(vec3(-100, 100, -100));
cameraPath.push_back(vec3(-150, 0, -150));
cameraPath.push_back(vec3(0, 0, 0));
for(int i = 0; i < bSmoother.getFactorialMax() - cameraPath.size() - 1; ++i)
{
vec3 newPos;
srand(i * timer);
newPos.x = (rand() % grid_size) - (grid_size / 2);
srand(i+1 * timer);
newPos.y = (rand() % 16)+1;
srand(i+2 * timer);
newPos.z = (rand() % grid_size) - (grid_size / 2);
unsigned int j = 3;
while (i && int(distance(newPos, cameraPath[i - 1])) < 200)
{
srand((i + j + 0) * timer);
newPos.x = (rand() % grid_size) - (grid_size / 2);
srand((i + j + 2) * timer);
newPos.z = (rand() % grid_size) - (grid_size / 2);
++j;
}
cameraPath.push_back(newPos);
}
cameraPath.push_back(cameraPath.front());
int smoothValue = 50;
vector<vec3> cameraSmoothPath = bSmoother.Bezier3D(cameraPath, bSmoother.getFactorialMax() * smoothValue);
/**************
* Framebuffers
*************/
GLuint gbufferFbo;
GLuint gbufferTextures[3];
glGenTextures(3, gbufferTextures);
GLuint gbufferDrawBuffers[2];
// Create color texture
glBindTexture(GL_TEXTURE_2D, gbufferTextures[0]);
glTexImage2D(GL_TEXTURE_2D, 0, GL_RGBA8, width, height, 0, GL_RGBA, GL_UNSIGNED_BYTE, 0);
glTexParameteri(GL_TEXTURE_2D, GL_TEXTURE_MIN_FILTER, GL_NEAREST);
glTexParameteri(GL_TEXTURE_2D, GL_TEXTURE_MAG_FILTER, GL_NEAREST);
glTexParameterf(GL_TEXTURE_2D, GL_TEXTURE_WRAP_S, GL_CLAMP_TO_EDGE);
glTexParameterf(GL_TEXTURE_2D, GL_TEXTURE_WRAP_T, GL_CLAMP_TO_EDGE);
// Create normal texture
glBindTexture(GL_TEXTURE_2D, gbufferTextures[1]);
glTexImage2D(GL_TEXTURE_2D, 0, GL_RGBA32F, width, height, 0, GL_RGBA, GL_FLOAT, 0);
glTexParameteri(GL_TEXTURE_2D, GL_TEXTURE_MIN_FILTER, GL_NEAREST);
glTexParameteri(GL_TEXTURE_2D, GL_TEXTURE_MAG_FILTER, GL_NEAREST);
glTexParameterf(GL_TEXTURE_2D, GL_TEXTURE_WRAP_S, GL_CLAMP_TO_EDGE);
glTexParameterf(GL_TEXTURE_2D, GL_TEXTURE_WRAP_T, GL_CLAMP_TO_EDGE);
// Create depth texture
glBindTexture(GL_TEXTURE_2D, gbufferTextures[2]);
glTexImage2D(GL_TEXTURE_2D, 0, GL_DEPTH_COMPONENT24, width, height, 0, GL_DEPTH_COMPONENT, GL_FLOAT, 0);
glTexParameteri(GL_TEXTURE_2D, GL_TEXTURE_MIN_FILTER, GL_NEAREST);
glTexParameteri(GL_TEXTURE_2D, GL_TEXTURE_MAG_FILTER, GL_NEAREST);
glTexParameterf(GL_TEXTURE_2D, GL_TEXTURE_WRAP_S, GL_CLAMP_TO_EDGE);
glTexParameterf(GL_TEXTURE_2D, GL_TEXTURE_WRAP_T, GL_CLAMP_TO_EDGE);
// Create Framebuffer Object
glGenFramebuffers(1, &gbufferFbo);
glBindFramebuffer(GL_FRAMEBUFFER, gbufferFbo);
// Initialize DrawBuffers
gbufferDrawBuffers[0] = GL_COLOR_ATTACHMENT0;
gbufferDrawBuffers[1] = GL_COLOR_ATTACHMENT1;
glDrawBuffers(2, gbufferDrawBuffers);
// Attach textures to framebuffer
glFramebufferTexture2D(GL_FRAMEBUFFER, GL_COLOR_ATTACHMENT0 , GL_TEXTURE_2D, gbufferTextures[0], 0);
glFramebufferTexture2D(GL_FRAMEBUFFER, GL_COLOR_ATTACHMENT1 , GL_TEXTURE_2D, gbufferTextures[1], 0);
glFramebufferTexture2D(GL_FRAMEBUFFER, GL_DEPTH_ATTACHMENT, GL_TEXTURE_2D, gbufferTextures[2], 0);
if(glCheckFramebufferStatus(GL_FRAMEBUFFER) != GL_FRAMEBUFFER_COMPLETE)
{
cerr << "Error on building framebuffer" << endl;
exit( EXIT_FAILURE );
}
/*****************
* FX Framebuffers
****************/
// Create Fx Framebuffer Object
GLuint fxFbo;
GLuint fxDrawBuffers[1];
glGenFramebuffers(1, &fxFbo);
glBindFramebuffer(GL_FRAMEBUFFER, fxFbo);
fxDrawBuffers[0] = GL_COLOR_ATTACHMENT0;
glDrawBuffers(1, fxDrawBuffers);
// Create Fx textures
const int FX_TEXTURE_COUNT = 4;
GLuint fxTextures[FX_TEXTURE_COUNT];
glGenTextures(FX_TEXTURE_COUNT, fxTextures);
for (int i = 0; i < FX_TEXTURE_COUNT; ++i)
{
glBindTexture(GL_TEXTURE_2D, fxTextures[i]);
glTexImage2D(GL_TEXTURE_2D, 0, GL_RGBA8, width, height, 0, GL_RGBA, GL_UNSIGNED_BYTE, 0);
glTexParameteri(GL_TEXTURE_2D, GL_TEXTURE_MIN_FILTER, GL_NEAREST);
glTexParameteri(GL_TEXTURE_2D, GL_TEXTURE_MAG_FILTER, GL_NEAREST);
glTexParameterf(GL_TEXTURE_2D, GL_TEXTURE_WRAP_S, GL_CLAMP_TO_EDGE);
glTexParameterf(GL_TEXTURE_2D, GL_TEXTURE_WRAP_T, GL_CLAMP_TO_EDGE);
}
// Attach first fx texture to framebuffer
glFramebufferTexture2D(GL_FRAMEBUFFER, GL_COLOR_ATTACHMENT0 , GL_TEXTURE_2D, fxTextures[0], 0);
if(glCheckFramebufferStatus(GL_FRAMEBUFFER) != GL_FRAMEBUFFER_COMPLETE)
{
cerr << "Error on building FX framebuffer" << endl;
exit( EXIT_FAILURE );
}
glBindFramebuffer(GL_FRAMEBUFFER, 0);
checkError("Framebuffers");
/*********
* SHADERS
********/
GLuint vertShaderCubeGrid = compile_shader_from_file(GL_VERTEX_SHADER, "shaders/cube_grid.vert");
GLuint fragShaderCubeGrid = compile_shader_from_file(GL_FRAGMENT_SHADER, "shaders/cube_grid.frag");
GLuint programCubeGrid = glCreateProgram();
glAttachShader(programCubeGrid, vertShaderCubeGrid);
glAttachShader(programCubeGrid, fragShaderCubeGrid);
glLinkProgram(programCubeGrid);
if (check_link_error(programCubeGrid) < 0)
exit(1);
GLuint vertShaderSphere = compile_shader_from_file(GL_VERTEX_SHADER, "shaders/sphere.vert");
GLuint fragShaderSphere = compile_shader_from_file(GL_FRAGMENT_SHADER, "shaders/sphere.frag");
GLuint programSphere = glCreateProgram();
glAttachShader(programSphere, vertShaderSphere);
glAttachShader(programSphere, fragShaderSphere);
glLinkProgram(programSphere);
if (check_link_error(programSphere) < 0)
exit(1);
GLuint vertShaderBlit = compile_shader_from_file(GL_VERTEX_SHADER, "shaders/blit.vert");
GLuint fragShaderBlit = compile_shader_from_file(GL_FRAGMENT_SHADER, "shaders/blit.frag");
GLuint programBlit = glCreateProgram();
glAttachShader(programBlit, vertShaderBlit);
glAttachShader(programBlit, fragShaderBlit);
glLinkProgram(programBlit);
if (check_link_error(programBlit) < 0)
exit(1);
// Try to load and compile directionallight shaders
GLuint fragShaderDirLight = compile_shader_from_file(GL_FRAGMENT_SHADER, "shaders/dirLight.frag");
GLuint programDirLight = glCreateProgram();
glAttachShader(programDirLight, vertShaderBlit);
glAttachShader(programDirLight, fragShaderDirLight);
glLinkProgram(programDirLight);
if (check_link_error(programDirLight) < 0)
exit(1);
// Try to load and compile blur shaders
GLuint fragShaderBlur = compile_shader_from_file(GL_FRAGMENT_SHADER, "shaders/blur.frag");
GLuint programBlur = glCreateProgram();
glAttachShader(programBlur, vertShaderBlit);
glAttachShader(programBlur, fragShaderBlur);
glLinkProgram(programBlur);
if (check_link_error(programBlur) < 0)
exit(1);
GLint blurTextureLocation = glGetUniformLocation(programBlur, "Texture");
glProgramUniform1i(programBlur, blurTextureLocation, 0);
GLint blurSampleCountLocation = glGetUniformLocation(programBlur, "SampleCount");
GLint blurDirectionLocation = glGetUniformLocation(programBlur, "Direction");
// Try to load and compile coc shaders
GLuint fragShaderCoC = compile_shader_from_file(GL_FRAGMENT_SHADER, "shaders/coc.frag");
GLuint programCoC = glCreateProgram();
glAttachShader(programCoC, vertShaderBlit);
glAttachShader(programCoC, fragShaderCoC);
glLinkProgram(programCoC);
if (check_link_error(programCoC) < 0)
exit(1);
GLint cocTextureLocation = glGetUniformLocation(programCoC, "Texture");
glProgramUniform1i(programCoC, cocTextureLocation, 0);
GLint cocScreenToViewCountLocation = glGetUniformLocation(programCoC, "ScreenToView");
GLint cocFocusnLocation = glGetUniformLocation(programCoC, "Focus");
// Try to load and compile dof shaders
GLuint fragShaderDoF = compile_shader_from_file(GL_FRAGMENT_SHADER, "shaders/dof.frag");
GLuint programDoF = glCreateProgram();
glAttachShader(programDoF, vertShaderBlit);
glAttachShader(programDoF, fragShaderDoF);
glLinkProgram(programDoF);
if (check_link_error(programDoF) < 0)
exit(1);
GLint dofColorLocation = glGetUniformLocation(programDoF, "Color");
glProgramUniform1i(programDoF, dofColorLocation, 0);
GLint dofCoCLocation = glGetUniformLocation(programDoF, "CoC");
glProgramUniform1i(programDoF, dofCoCLocation, 1);
GLint dofBlurLocation = glGetUniformLocation(programDoF, "Blur");
glProgramUniform1i(programDoF, dofBlurLocation, 2);
// Try to load and compile gamma shaders
GLuint fragShaderGamma = compile_shader_from_file(GL_FRAGMENT_SHADER, "shaders/gamma.frag");
GLuint gammaProgramObject = glCreateProgram();
glAttachShader(gammaProgramObject, vertShaderBlit);
glAttachShader(gammaProgramObject, fragShaderGamma);
glLinkProgram(gammaProgramObject);
if (check_link_error(gammaProgramObject) < 0)
exit(1);
GLint gammaTextureLocation = glGetUniformLocation(gammaProgramObject, "Texture");
glProgramUniform1i(gammaProgramObject, gammaTextureLocation, 0);
GLint gammaGammaLocation = glGetUniformLocation(gammaProgramObject, "Gamma");
// Try to load and compile glitches shaders
GLuint fragShaderGlitch = compile_shader_from_file(GL_FRAGMENT_SHADER, "shaders/glitch.frag");
GLuint glitchProgramObject = glCreateProgram();
glAttachShader(glitchProgramObject, vertShaderBlit);
glAttachShader(glitchProgramObject, fragShaderGlitch);
glLinkProgram(glitchProgramObject);
if (check_link_error(glitchProgramObject) < 0)
exit(1);
GLint glitchTextureLocation = glGetUniformLocation(glitchProgramObject, "Texture");
glProgramUniform1i(glitchProgramObject, glitchTextureLocation, 0);
GLint glitchTimeLocation = glGetUniformLocation(glitchProgramObject, "time");
/**********
* UNIFORMS
*********/
GLint mvpLocation = glGetUniformLocation(programCubeGrid, "MVP");
GLint mvLocation = glGetUniformLocation(programCubeGrid, "MV");
GLint grid_sizeLocation = glGetUniformLocation(programCubeGrid, "grid_size");
GLint timeLocation = glGetUniformLocation(programCubeGrid, "time");
GLint colorNearLocation = glGetUniformLocation(programCubeGrid, "colorNear");
GLint colorFarLocation = glGetUniformLocation(programCubeGrid, "colorFar");
GLint brightnessLocation = glGetUniformLocation(programCubeGrid, "brightness");
GLint attenuationLocation = glGetUniformLocation(programCubeGrid, "attenuation");
GLint cameraPosLocation = glGetUniformLocation(programCubeGrid, "camPos");
GLint lightDirLocation = glGetUniformLocation(programCubeGrid, "lightDir");
glProgramUniform3fv(programCubeGrid, lightDirLocation, 1, value_ptr(directionalLightDir));
GLint blitTextureLocation = glGetUniformLocation(programBlit, "Texture");
glProgramUniform1i(programBlit, blitTextureLocation, 0);
GLint directionallightColorLocation = glGetUniformLocation(programDirLight, "ColorBuffer");
GLint directionallightNormalLocation = glGetUniformLocation(programDirLight, "NormalBuffer");
GLint directionallightDepthLocation = glGetUniformLocation(programDirLight, "DepthBuffer");
GLint mvLightLocation = glGetUniformLocation(programDirLight, "MV");
GLint directionallightLightLocation = glGetUniformBlockIndex(programDirLight, "light");
GLint directionalInverseProjectionLocation = glGetUniformLocation(programDirLight, "InverseProjection");
glProgramUniform1i(programDirLight, directionallightColorLocation, 0);
glProgramUniform1i(programDirLight, directionallightNormalLocation, 1);
glProgramUniform1i(programDirLight, directionallightDepthLocation, 2);
GLint mvpSphereLocation = glGetUniformLocation(programSphere, "MVP");
GLint mvSphereLocation = glGetUniformLocation(programSphere, "MV");
GLint colorSphereLocation = glGetUniformLocation(programSphere, "Color");
GLint position_scriptedLocation = glGetUniformLocation(programSphere, "position_scripted");
if (!checkError("Uniforms"))
exit(1);
/*****************
* Uniform Buffers
****************/
// Update and bind uniform buffer object
GLuint ubo[1];
glGenBuffers(1, ubo);
glBindBuffer(GL_UNIFORM_BUFFER, ubo[0]);
GLint uboSize = 0;
glGetActiveUniformBlockiv(programDirLight, (GLuint) directionallightLightLocation, GL_UNIFORM_BLOCK_DATA_SIZE, &uboSize);
uboSize = 512;
glBufferData(GL_UNIFORM_BUFFER, uboSize, 0, GL_DYNAMIC_DRAW);
glBindBuffer(GL_UNIFORM_BUFFER, 0);
/***************
* Blit geometry
**************/
// Load geometry
int quad_triangleCount = 2;
int quad_triangleList[] = {0, 1, 2, 2, 1, 3};
float quad_vertices[] = {-1.f, -1.f, 1.0, -1.f, -1.f, 1.0, 1.0, 1.0};
// Vertex Array Object
GLuint quad_vao;
glGenVertexArrays(1, &quad_vao);
// Vertex Buffer Objects
GLuint quad_vbo[2];
glGenBuffers(2, quad_vbo);
// Quad
glBindVertexArray(quad_vao);
// Bind indices and upload data
glBindBuffer(GL_ELEMENT_ARRAY_BUFFER, quad_vbo[0]);
glBufferData(GL_ELEMENT_ARRAY_BUFFER, sizeof(quad_triangleList), quad_triangleList, GL_STATIC_DRAW);
// Bind vertices and upload data
glBindBuffer(GL_ARRAY_BUFFER, quad_vbo[1]);
glEnableVertexAttribArray(0);
glVertexAttribPointer(0, 2, GL_FLOAT, GL_FALSE, sizeof(GL_FLOAT)*2, (void*)0);
glBufferData(GL_ARRAY_BUFFER, sizeof(quad_vertices), quad_vertices, GL_STATIC_DRAW);
/******
* Cube
*****/
// Load geometry
int cube_triangleCount = 12;
int cube_triangleList[] = {0, 1, 2, 2, 1, 3, 4, 5, 6, 6, 5, 7, 8, 9, 10, 10, 9, 11, 12, 13, 14, 14, 13, 15, 16, 17, 18, 19, 17, 20, 21, 22, 23, 24, 25, 26, };
float cube_uvs[] = {0.f, 0.f, 0.f, 1.f, 1.f, 0.f, 1.f, 1.f, 0.f, 0.f, 0.f, 1.f, 1.f, 0.f, 1.f, 1.f, 0.f, 0.f, 0.f, 1.f, 1.f, 0.f, 1.f, 1.f, 0.f, 0.f, 0.f, 1.f, 1.f, 0.f, 1.f, 1.f, 0.f, 0.f, 0.f, 1.f, 1.f, 0.f, 1.f, 0.f, 1.f, 1.f, 0.f, 1.f, 1.f, 1.f, 0.f, 0.f, 0.f, 0.f, 1.f, 1.f, 1.f, 0.f, };
float cube_vertices[] = {-0.5f, 0.f, 0.5, 0.5, 0.f, 0.5, -0.5f, 1.f, 0.5, 0.5, 1.f, 0.5, -0.5f, 1.f, 0.5, 0.5, 1.f, 0.5, -0.5f, 1.f, -0.5f, 0.5, 1.f, -0.5f, -0.5f, 1.f, -0.5f, 0.5, 1.f, -0.5f, -0.5f, 0.f, -0.5f, 0.5, 0.f, -0.5f, -0.5f, 0.f, -0.5f, 0.5, 0.f, -0.5f, -0.5f, 0.f, 0.5, 0.5, 0.f, 0.5, 0.5, 0.f, 0.5, 0.5, 0.f, -0.5f, 0.5, 1.f, 0.5, 0.5, 1.f, 0.5, 0.5, 1.f, -0.5f, -0.5f, 0.f, -0.5f, -0.5f, 0.f, 0.5, -0.5f, 1.f, -0.5f, -0.5f, 1.f, -0.5f, -0.5f, 0.f, 0.5, -0.5f, 1.f, 0.5 };
float cube_normals[] = {0, 0, 1, 0, 0, 1, 0, 0, 1, 0, 0, 1, 0, 1, 0, 0, 1, 0, 0, 1, 0, 0, 1, 0, 0, 0, -1, 0, 0, -1, 0, 0, -1, 0, 0, -1, 0, -1, 0, 0, -1, 0, 0, -1, 0, 0, -1, 0, 1, 0, 0, 1, 0, 0, 1, 0, 0, 1, 0, 0, 1, 0, 0, -1, 0, 0, -1, 0, 0, -1, 0, 0, -1, 0, 0, -1, 0, 0, -1, 0, 0, };
// Vertex Array Object
GLuint vao;
glGenVertexArrays(1, &vao);
// Vertex Buffer Objects
GLuint vbo[4];
glGenBuffers(4, vbo);
// Cube
glBindVertexArray(vao);
// Bind indices and upload data
glBindBuffer(GL_ELEMENT_ARRAY_BUFFER, vbo[0]);
glBufferData(GL_ELEMENT_ARRAY_BUFFER, sizeof(cube_triangleList), cube_triangleList, GL_STATIC_DRAW);
// Bind vertices and upload data
glBindBuffer(GL_ARRAY_BUFFER, vbo[1]);
glEnableVertexAttribArray(0);
glVertexAttribPointer(0, 3, GL_FLOAT, GL_FALSE, sizeof(GL_FLOAT)*3, (void*)0);
glBufferData(GL_ARRAY_BUFFER, sizeof(cube_vertices), cube_vertices, GL_STATIC_DRAW);
// Bind normals and upload data
glBindBuffer(GL_ARRAY_BUFFER, vbo[2]);
glEnableVertexAttribArray(1);
glVertexAttribPointer(1, 3, GL_FLOAT, GL_FALSE, sizeof(GL_FLOAT)*3, (void*)0);
glBufferData(GL_ARRAY_BUFFER, sizeof(cube_normals), cube_normals, GL_STATIC_DRAW);
// Bind uv coords and upload data
glBindBuffer(GL_ARRAY_BUFFER, vbo[3]);
glEnableVertexAttribArray(2);
glVertexAttribPointer(2, 2, GL_FLOAT, GL_FALSE, sizeof(GL_FLOAT)*2, (void*)0);
glBufferData(GL_ARRAY_BUFFER, sizeof(cube_uvs), cube_uvs, GL_STATIC_DRAW);
/********
* Sphere
*******/
vector<GLuint> sphere_indices;
vector<GLfloat> sphere_vertices;
vector<GLfloat> sphere_normals;
// Construction
int i, j, indicator{0}, lats{40}, longs{40};
for(i = 0; i <= lats; i++) {
double lat0 = pi<double>() * (-0.5 + (double) (i - 1) / lats);
double z0 = sin(lat0);
double zr0 = cos(lat0);
double lat1 = pi<double>() * (-0.5 + (double) i / lats);
double z1 = sin(lat1);
double zr1 = cos(lat1);
for(j = 0; j <= longs; j++) {
double lng = 2 * glm::pi<double>() * (double) (j - 1) / longs;
double x = cos(lng);
double y = sin(lng);
sphere_vertices.push_back((float &&) (x * zr0));
sphere_vertices.push_back((float &&) (y * zr0));
sphere_vertices.push_back((const float &) z0);
sphere_indices.push_back((const unsigned int &) indicator);
vec3 normal = normalize(vec3(x * zr0, y * zr0, z0));
sphere_normals.push_back(normal.x);
sphere_normals.push_back(normal.y);
sphere_normals.push_back(normal.z);
indicator++;
sphere_vertices.push_back((float &&) (x * zr1));
sphere_vertices.push_back((float &&) (y * zr1));
sphere_vertices.push_back((const float &) z1);
sphere_indices.push_back((const unsigned int &) indicator);
normal = normalize(vec3(x * zr1, y * zr1, z1));
sphere_normals.push_back(normal.x);
sphere_normals.push_back(normal.y);
sphere_normals.push_back(normal.z);
indicator++;
}
sphere_indices.push_back(GL_PRIMITIVE_RESTART_FIXED_INDEX);
}
// Vertex Array Object
GLuint sphere_vao;
glGenVertexArrays(1, &sphere_vao);
// Vertex Buffer Objects
GLuint sphere_vbo[4];
glGenBuffers(4, sphere_vbo);
glBindVertexArray(sphere_vao);
glBindBuffer(GL_ARRAY_BUFFER, sphere_vbo[0]);
glBufferData(GL_ARRAY_BUFFER, sphere_vertices.size() * sizeof(GLfloat), &sphere_vertices[0], GL_STATIC_DRAW);
glVertexAttribPointer(0, 3, GL_FLOAT, GL_FALSE, 0, NULL);
glEnableVertexAttribArray (0);
glBindBuffer(GL_ARRAY_BUFFER, sphere_vbo[1]);
glEnableVertexAttribArray(1);
glVertexAttribPointer(1, 3, GL_FLOAT, GL_FALSE, sizeof(GL_FLOAT)*3, (void*)0);
glBufferData(GL_ARRAY_BUFFER, sphere_normals.size()* sizeof(GLfloat), &sphere_normals[0], GL_STATIC_DRAW);
glBindBuffer(GL_ELEMENT_ARRAY_BUFFER, sphere_vbo[1]);
glBufferData(GL_ELEMENT_ARRAY_BUFFER, sphere_indices.size() * sizeof(GLuint), &sphere_indices[0], GL_STATIC_DRAW);
int numsToDraw = sphere_indices.size();
// Unbind
glBindVertexArray(0);
glBindBuffer(GL_ARRAY_BUFFER, 0);
glBindBuffer(GL_ELEMENT_ARRAY_BUFFER, 0);
while (!glfwWindowShouldClose(window))
{
ImGui_ImplGlfwGL3_NewFrame();
currentTime = glfwGetTime();
/**********
* Viewport
*********/
glViewport(0, 0, width, height);
// Mouse states
int leftButton = glfwGetMouseButton( window, GLFW_MOUSE_BUTTON_LEFT );
int rightButton = glfwGetMouseButton( window, GLFW_MOUSE_BUTTON_RIGHT );
int middleButton = glfwGetMouseButton( window, GLFW_MOUSE_BUTTON_MIDDLE );
guiStates.turnLock = leftButton == GLFW_PRESS;
guiStates.zoomLock = rightButton == GLFW_PRESS;
guiStates.panLock = middleButton == GLFW_PRESS;
// Camera movements
int altPressed = glfwGetKey(window, GLFW_KEY_LEFT_SHIFT);
if (!altPressed && (leftButton == GLFW_PRESS || rightButton == GLFW_PRESS || middleButton == GLFW_PRESS))
{
double x; double y;
glfwGetCursorPos(window, &x, &y);
guiStates.lockPositionX = (int) x;
guiStates.lockPositionY = (int) y;
}
if (altPressed == GLFW_PRESS)
{
double mousex; double mousey;
glfwGetCursorPos(window, &mousex, &mousey);
int diffLockPositionX = (int) (mousex - guiStates.lockPositionX);
int diffLockPositionY = (int) (mousey - guiStates.lockPositionY);
if (guiStates.zoomLock)
{
float zoomDir = 0.0;
if (diffLockPositionX > 0)
zoomDir = -1.f;
else if (diffLockPositionX < 0 )
zoomDir = 1.f;
camera_zoom(camera, zoomDir * GUIStates::MOUSE_ZOOM_SPEED);
}
else if (guiStates.turnLock)
{
camera_turn(camera, diffLockPositionY * GUIStates::MOUSE_TURN_SPEED,
diffLockPositionX * GUIStates::MOUSE_TURN_SPEED);
}
else if (guiStates.panLock)
{
camera_pan(camera, diffLockPositionX * GUIStates::MOUSE_PAN_SPEED,
diffLockPositionY * GUIStates::MOUSE_PAN_SPEED);
}
guiStates.lockPositionX = (int) mousex;
guiStates.lockPositionY = (int) mousey;
}
// Default states
glEnable(GL_DEPTH_TEST);
// Clear the front buffer
glClearColor(clearColor[0], clearColor[1], clearColor[2], clearColor[3]);
glClear(GL_COLOR_BUFFER_BIT | GL_DEPTH_BUFFER_BIT);
// Get camera matrices
mat4 projection = perspective(45.0f, (float) width / (float) height, 0.1f, 10000.f);
#if DEBUG
mat4 worldToView = lookAt(camera.eye, camera.o, camera.up);
#else
int indexEye = int(currentTime * 40) % (cameraSmoothPath.size());
int indexO = int((currentTime + 1.0 ) * 40) % (cameraSmoothPath.size());
int indexPrev = int((currentTime - 0.1 ) * 40) % (cameraSmoothPath.size());
vec3 cameraBezierEye = cameraSmoothPath[indexEye];
camera.eye = cameraBezierEye;
vec3 cameraBezierO = cameraSmoothPath[(indexO + indexEye) / 2];
camera.o = cameraSmoothPath[indexO];
vec3 cameraPrevious = cameraSmoothPath[indexPrev];
float cameraAngle = (float) (
-angleBetween(cameraBezierO - cameraBezierEye, cameraBezierEye - cameraPrevious, vec3(1.f, 0.f, 0.f)) / M_PI);
camera.up = vec3(0, abs(cos(cameraAngle)), sin(cameraAngle));
mat4 worldToView = lookAt(cameraBezierEye, cameraBezierO, camera.up);
#endif
mat4 objectToWorld;
mat4 mv = worldToView * objectToWorld;
mat4 mvp = projection * mv;
mat4 inverseProjection = inverse(projection);
// Bind gbuffer
glBindFramebuffer(GL_FRAMEBUFFER, gbufferFbo);
// Clear the gbuffer
glClear(GL_COLOR_BUFFER_BIT | GL_DEPTH_BUFFER_BIT);
// Select shader
glUseProgram(programCubeGrid);
// Upload uniforms
glProgramUniformMatrix4fv(programCubeGrid, mvLocation, 1, 0, value_ptr(mv));
glProgramUniformMatrix4fv(programCubeGrid, mvpLocation, 1, 0, value_ptr(mvp));
glProgramUniform1i(programCubeGrid, grid_sizeLocation, grid_size);
glProgramUniform1f(programCubeGrid, timeLocation, currentTime);
glProgramUniform3fv(programCubeGrid, colorNearLocation, 1, value_ptr(colorNear));
glProgramUniform3fv(programCubeGrid, colorFarLocation, 1, value_ptr(colorFar));
glProgramUniform1f(programCubeGrid, brightnessLocation, brightness);
glProgramUniform1f(programCubeGrid, attenuationLocation, attenuation);
glProgramUniform3fv(programCubeGrid, cameraPosLocation, 1, value_ptr(camera.eye));
glProgramUniformMatrix4fv(programDirLight, directionalInverseProjectionLocation, 1, 0, value_ptr(inverseProjection));
glProgramUniformMatrix4fv(programDirLight, mvLightLocation, 1, 0, value_ptr(mv));
glProgramUniformMatrix4fv(programSphere, mvSphereLocation, 1, 0, value_ptr(mv));
glProgramUniformMatrix4fv(programSphere, mvpSphereLocation, 1, 0, value_ptr(mvp));
glProgramUniform3fv(programSphere, colorSphereLocation, 1, value_ptr(sphereColor));
glProgramUniform3fv(programSphere, position_scriptedLocation, 1, value_ptr(camera.o));
// Render vaos
// Cubes
glBindVertexArray(vao);
glDrawElementsInstanced(GL_TRIANGLES, cube_triangleCount * 3, GL_UNSIGNED_INT, (void*)0, grid_size * grid_size);
// Sphere
glUseProgram(programSphere);
glBindVertexArray(sphere_vao);
glEnable(GL_PRIMITIVE_RESTART);
glPrimitiveRestartIndex(GL_PRIMITIVE_RESTART_FIXED_INDEX);
glBindBuffer(GL_ELEMENT_ARRAY_BUFFER, sphere_vbo[1]);
glDrawElements(GL_QUAD_STRIP, numsToDraw, GL_UNSIGNED_INT, NULL);
glDisable(GL_PRIMITIVE_RESTART);
glBindFramebuffer(GL_FRAMEBUFFER, fxFbo);
// Attach first fx texture to framebuffer
glFramebufferTexture2D(GL_FRAMEBUFFER, GL_COLOR_ATTACHMENT0 , GL_TEXTURE_2D, fxTextures[0], 0);
glClear(GL_COLOR_BUFFER_BIT);
glDisable(GL_DEPTH_TEST);
glEnable(GL_BLEND);
glBlendFunc(GL_ONE, GL_ONE);
// Select textures
glActiveTexture(GL_TEXTURE0);
glBindTexture(GL_TEXTURE_2D, gbufferTextures[0]);
glActiveTexture(GL_TEXTURE1);
glBindTexture(GL_TEXTURE_2D, gbufferTextures[1]);
glActiveTexture(GL_TEXTURE2);
glBindTexture(GL_TEXTURE_2D, gbufferTextures[2]);
glBindVertexArray(quad_vao);
/**************
* Light Render
*************/
// Render directional lights
glUseProgram(programDirLight);
struct DirectionalLight
{
vec3 direction;
int padding;
vec3 color;
float intensity;
};
for (int i = 0; i < directionalLightCount; ++i)
{
glBindBuffer(GL_UNIFORM_BUFFER, ubo[0]);
DirectionalLight d = {
vec3(directionalLightDir), 0,
directionalLightColor,
directionalLightIntensity
};
DirectionalLight * directionalLightBuffer = (DirectionalLight *)glMapBufferRange(GL_UNIFORM_BUFFER, 0, uboSize, GL_MAP_WRITE_BIT | GL_MAP_INVALIDATE_BUFFER_BIT);
*directionalLightBuffer = d;
glUnmapBuffer(GL_UNIFORM_BUFFER);
glBindBufferBase(GL_UNIFORM_BUFFER, (GLuint) directionallightLightLocation, ubo[0]);
glDrawElements(GL_TRIANGLES, quad_triangleCount * 3, GL_UNSIGNED_INT, (void*)0);
}
glUseProgram(programBlit);
glActiveTexture(GL_TEXTURE0);
glDrawElements(GL_TRIANGLES, quad_triangleCount * 3, GL_UNSIGNED_INT, (void*)0);
glDisable(GL_BLEND);
glActiveTexture(GL_TEXTURE0);
glBindTexture(GL_TEXTURE_2D, gbufferTextures[0]);
glActiveTexture(GL_TEXTURE1);
glBindTexture(GL_TEXTURE_2D, gbufferTextures[1]);
glActiveTexture(GL_TEXTURE2);
glBindTexture(GL_TEXTURE_2D, gbufferTextures[2]);
glFramebufferTexture2D(GL_FRAMEBUFFER, GL_COLOR_ATTACHMENT0 , GL_TEXTURE_2D, fxTextures[1], 0);
glClear(GL_COLOR_BUFFER_BIT);
// vertical blur
glUseProgram(programBlur);
glProgramUniform1i(programBlur, blurSampleCountLocation, sampleCount);
glProgramUniform2i(programBlur, blurDirectionLocation, 0, 1);
glActiveTexture(GL_TEXTURE0);
glBindTexture(GL_TEXTURE_2D, fxTextures[0]);
glDrawElements(GL_TRIANGLES, quad_triangleCount * 3, GL_UNSIGNED_INT, (void*)0);
glFramebufferTexture2D(GL_FRAMEBUFFER, GL_COLOR_ATTACHMENT0 , GL_TEXTURE_2D, fxTextures[2], 0);
glClear(GL_COLOR_BUFFER_BIT);
// horizontal blur
glProgramUniform2i(programBlur, blurDirectionLocation, 1, 0);
glActiveTexture(GL_TEXTURE0);
glBindTexture(GL_TEXTURE_2D, fxTextures[1]);
glDrawElements(GL_TRIANGLES, quad_triangleCount * 3, GL_UNSIGNED_INT, (void*)0);
glFramebufferTexture2D(GL_FRAMEBUFFER, GL_COLOR_ATTACHMENT0 , GL_TEXTURE_2D, fxTextures[1], 0);
glClear(GL_COLOR_BUFFER_BIT);
// CoC compute
glUseProgram(programCoC);
glProgramUniform3f(programCoC, cocFocusnLocation, focusPlane, nearPlane, farPlane);
glProgramUniformMatrix4fv(programCoC, cocScreenToViewCountLocation, 1, 0, glm::value_ptr(inverseProjection));
glActiveTexture(GL_TEXTURE0);
glBindTexture(GL_TEXTURE_2D, gbufferTextures[2]);
glDrawElements(GL_TRIANGLES, quad_triangleCount * 3, GL_UNSIGNED_INT, (void*)0);
glFramebufferTexture2D(GL_FRAMEBUFFER, GL_COLOR_ATTACHMENT0 , GL_TEXTURE_2D, fxTextures[3], 0);
glClear(GL_COLOR_BUFFER_BIT);
// dof compute
glUseProgram(programDoF);
glActiveTexture(GL_TEXTURE0);
glBindTexture(GL_TEXTURE_2D, fxTextures[0]); // Color
glActiveTexture(GL_TEXTURE1);
glBindTexture(GL_TEXTURE_2D, fxTextures[1]); // CoC
glActiveTexture(GL_TEXTURE2);
glBindTexture(GL_TEXTURE_2D, fxTextures[2]); // Blur
glDrawElements(GL_TRIANGLES, quad_triangleCount * 3, GL_UNSIGNED_INT, (void*)0);
glFramebufferTexture2D(GL_FRAMEBUFFER, GL_COLOR_ATTACHMENT0 , GL_TEXTURE_2D, fxTextures[1], 0);
glClear(GL_COLOR_BUFFER_BIT);
// Gamma
glUseProgram(gammaProgramObject);
glProgramUniform1f(gammaProgramObject, gammaGammaLocation, gamma);
glActiveTexture(GL_TEXTURE0);
glBindTexture(GL_TEXTURE_2D, fxTextures[3]);
glDrawElements(GL_TRIANGLES, quad_triangleCount * 3, GL_UNSIGNED_INT, (void*)0);
glBindFramebuffer(GL_FRAMEBUFFER, 0);
// Glitches
glUseProgram(glitchProgramObject);
glProgramUniform1f(glitchProgramObject, glitchTimeLocation, currentTime);
glActiveTexture(GL_TEXTURE0);
glBindTexture(GL_TEXTURE_2D, fxTextures[1]);
glDrawElements(GL_TRIANGLES, quad_triangleCount * 3, GL_UNSIGNED_INT, (void*)0);
#if DEBUG
/**************
* Blit Screens
*************/
glUseProgram(programBlit);
glActiveTexture(GL_TEXTURE0);
glViewport( 0, 0, width/3, height/4);
// Bind quad VAO
glBindVertexArray(quad_vao);
// Bind gbuffer color texture
glBindTexture(GL_TEXTURE_2D, gbufferTextures[0]);
// Draw quad
glDrawElements(GL_TRIANGLES, quad_triangleCount * 3, GL_UNSIGNED_INT, (void*)0);
// Viewport
glViewport( width/3, 0, width/3, height/4 );
// Bind texture
glBindTexture(GL_TEXTURE_2D, gbufferTextures[1]);
// Draw quad
glDrawElements(GL_TRIANGLES, quad_triangleCount * 3, GL_UNSIGNED_INT, (void*)0);
// Viewport
glViewport( width/3 * 2, 0, width/3, height/4 );
// Bind texture
glBindTexture(GL_TEXTURE_2D, gbufferTextures[2]);
// Draw quad
glDrawElements(GL_TRIANGLES, quad_triangleCount * 3, GL_UNSIGNED_INT, (void*)0);
ImGui::SetNextWindowSize(ImVec2(200,100), ImGuiSetCond_FirstUseEver);
ImGui::Begin("Settings");
ImGui::ColorEdit3("clear color", clearColor);
ImGui::Text("Grid Size");
ImGui::RadioButton("10", &grid_size, 10); ImGui::SameLine();
ImGui::RadioButton("100", &grid_size, 100); ImGui::SameLine();
ImGui::RadioButton("1000", &grid_size, 1000);
ImGui::Text("Grid Shader");
ImGui::ColorEdit3("colorNear", value_ptr(colorNear));
ImGui::ColorEdit3("colorFar", value_ptr(colorFar));
ImGui::SliderFloat("Brightness", &brightness, 0.f, 100.f);
ImGui::SliderFloat("Attenuation", &attenuation, 0.f, 20.f);
ImGui::Text("Directional light");
ImGui::ColorEdit3("Dir Light color", value_ptr(directionalLightColor));
ImGui::SliderFloat3("Dir light dir", value_ptr(directionalLightDir), -1.f, 1.f);
ImGui::SliderFloat("Dir Light Intensity", &directionalLightIntensity, 0.f, 5.f);
ImGui::Text("FX");
ImGui::SliderFloat("Gamma", &gamma, 0.01f, 3.0f);
ImGui::SliderFloat("Focus plane", &focusPlane, 1.f, 100.f);
ImGui::SliderFloat("Near plane", &nearPlane, 1.f, 100.f);
ImGui::SliderFloat("Far plane", &farPlane, 1.f, 100.f);
ImGui::DragInt("Sample Count", &sampleCount, .1f, 0, 100);
ImGui::ColorEdit3("colorSphere", value_ptr(sphereColor));
ImGui::Text("Application average %.3f ms/frame (%.1f FPS)", 1000.0f / ImGui::GetIO().Framerate, ImGui::GetIO().Framerate);
ImGui::End();
#endif
ImGui::Render();
// Check for errors
checkError("End loop");
glfwSwapBuffers(window);
glfwPollEvents();
}
ImGui_ImplGlfwGL3_Shutdown();
glfwDestroyWindow(window);
glfwTerminate();
exit(EXIT_SUCCESS);
}
// No windows implementation of strsep
char * strsep_custom(char **stringp, const char *delim)
{
register char *s;
register const char *spanp;
register int c, sc;
char *tok;
if ((s = *stringp) == NULL)
return (NULL);
for (tok = s; ; ) {
c = *s++;
spanp = delim;
do {
if ((sc = *spanp++) == c) {