main.cpp

   1 #include <stdio.h>
   2 #include <stdlib.h>
   3 #include <iostream>
   4 #include <array>
   5 #include <vector>
   6 #ifdef __APPLE__
   7 #include <GL/glew.h>
   8 #include "cocoa.h"
   9 #else
  10 #include <OpenGL/glew.h>
  11 #endif
  12 #include <GLUT/glut.h>
  13 #include "shapes.hpp"
  14 #include <glm/glm.hpp>
  15 #include <glm/ext.hpp>
  16 #include <glm/gtc/type_ptr.hpp>
  17 #include "model.hpp"
  18 #include "program.hpp"
  19 #include "skybox.hpp"
  20 #include "image.hpp"
  21
  22 #pragma clang diagnostic ignored "-Wdeprecated-declarations"
  23
  24 using namespace std;
  25
  26 GLuint lightVao;
  27
  28 Program *textureProg, *plainProg, *reflectProg, *pbrProg;
  29
  30 std::vector<Skybox> skyboxes;
  31 int activeSkybox = 0;
  32
  33 Model *chest, *mirrorCube, *pbr;
  34
  35 glm::vec3 camPos   = glm::vec3(0.0f, 0.0f,  -5.f);
  36 glm::vec3 camFront = glm::vec3(0.0f, 0.0f, 1.0f);
  37 glm::vec3 camUp    = glm::vec3(0.0f, 1.0f,  0.0f);
  38 float yaw = 1.57, pitch = 0;
  39
  40 struct Light {
  41         glm::vec3 pos;
  42         glm::vec3 color;
  43 };
  44
  45 std::vector<Light> lights = {
  46         { glm::vec3(0, 0, 3), glm::vec3(1) },
  47         { glm::vec3(0, 3, 0), glm::vec3(1) },
  48         { glm::vec3(3, 0, 0), glm::vec3(1) },
  49         { glm::vec3(3, 0, 0), glm::vec3(1) }
  50 };
  51
  52 int activeLight = 0;
  53
  54 int windowWidth = 800, windowHeight = 600;
  55
  56 float aspect() {
  57         return (float)windowWidth / (float)windowHeight;
  58 }
  59
  60 glm::mat4 projMat() {
  61         return glm::perspective(glm::radians(45.f), aspect(), 0.01f, 10000.f);
  62 }
  63
  64 glm::mat4 viewMat() {
  65         return glm::lookAt(camPos, camPos + camFront, camUp);
  66 }
  67
  68 void setProjectionAndViewUniforms(GLuint progId) {
  69         GLuint projLoc = glGetUniformLocation(progId, "projection");
  70         glm::mat4 proj = projMat();
  71         glUniformMatrix4fv(projLoc, 1, GL_FALSE, glm::value_ptr(proj));
  72
  73         GLuint viewLoc = glGetUniformLocation(progId, "view");
  74         glm::mat4 view = viewMat();
  75         glUniformMatrix4fv(viewLoc, 1, GL_FALSE, glm::value_ptr(view));
  76
  77         GLuint camPosLoc = glGetUniformLocation(progId, "camPos");
  78         glUniform3fv(camPosLoc, 1, glm::value_ptr(camPos));
  79 }
  80
  81 void setLightColorAndPos(GLuint progId, glm::vec3 lightPos, glm::vec4 lightColor) {
  82         GLuint lightColorLoc = glGetUniformLocation(progId, "lightColor");
  83         glUniform4fv(lightColorLoc, 1, glm::value_ptr(lightColor));
  84
  85         GLuint lightPosLoc = glGetUniformLocation(progId, "vLightPos");
  86         glUniform3fv(lightPosLoc, 1, glm::value_ptr(lightPos));
  87
  88         GLuint viewPosLoc = glGetUniformLocation(progId, "vViewPos");
  89         glUniform3fv(viewPosLoc, 1, glm::value_ptr(camPos));
  90 }
  91
  92 void drawLight(Light &light) {
  93         glUseProgram(plainProg->progId);
  94         glBindVertexArray(lightVao);
  95         setProjectionAndViewUniforms(plainProg->progId);
  96         glm::mat4 model = glm::translate(glm::mat4(1.f), light.pos);
  97         model = glm::scale(model, glm::vec3(0.2));
  98         GLuint modelLoc = glGetUniformLocation(plainProg->progId, "model");
  99         glUniformMatrix4fv(modelLoc, 1, GL_FALSE, glm::value_ptr(model));
 100
 101         GLuint colorLoc = glGetUniformLocation(plainProg->progId, "color");
 102         glUniform4fv(colorLoc, 1, glm::value_ptr(light.color));
 103
 104         glDrawArrays(GL_TRIANGLES, 0, 36);
 105 }
 106
 107
 108 void display() {
 109         glClearColor(0.5, 0.5, 0.5, 1);
 110         glClear(GL_COLOR_BUFFER_BIT|GL_DEPTH_BUFFER_BIT);
 111         glViewport(0, 0, windowWidth * 2, windowHeight * 2);
 112
 113         float d = (float)glutGet(GLUT_ELAPSED_TIME) * 0.001f;
 114
 115         glUseProgram(pbrProg->progId);
 116         setProjectionAndViewUniforms(pbrProg->progId);
 117
 118         glm::vec3 lightPositions[4], lightColors[4];
 119         for (int i = 0; i < 4; i++) {
 120                 lightPositions[i] = lights[i].pos;
 121                 lightColors[i] = lights[i].color;
 122         }
 123
 124         glUniform3fv(glGetUniformLocation(pbrProg->progId, "lightPositions"), 4, glm::value_ptr(lightPositions[0]));
 125         glUniform3fv(glGetUniformLocation(pbrProg->progId, "lightColors"), 4, glm::value_ptr(lightColors[0]));
 126
 127         pbr->draw(skyboxes[activeSkybox], d * 1000);
 128
 129         for (Light &light: lights) drawLight(light);
 130
 131         skyboxes[activeSkybox].draw(projMat(), viewMat());
 132
 133         glutSwapBuffers();
 134 }
 135
 136 void setupLightBuffers(GLuint progId) {
 137         auto vertices = cube();
 138         GLuint verticesSize = 36 * 3 * sizeof(GLfloat);
 139
 140         glGenVertexArrays(1, &lightVao);
 141         GLuint vbo;
 142         glBindVertexArray(lightVao);
 143         glGenBuffers(1, &vbo);
 144         glBindBuffer(GL_ARRAY_BUFFER, vbo);
 145         glBufferData(GL_ARRAY_BUFFER, verticesSize, NULL, GL_STATIC_DRAW);
 146         glBufferSubData(GL_ARRAY_BUFFER, 0, verticesSize, glm::value_ptr(vertices[0]));
 147         GLuint posLoc = glGetAttribLocation(progId, "vPosition");
 148         glEnableVertexAttribArray(posLoc);
 149         glVertexAttribPointer(posLoc, 3, GL_FLOAT, GL_FALSE, 0, 0);
 150 }
 151
 152 void init() {
 153         plainProg = new Program("plainvertex.glsl", "plainfrag.glsl");
 154         glUseProgram(plainProg->progId);
 155         setupLightBuffers(plainProg->progId);
 156         plainProg->validate();
 157
 158         skyboxes.push_back(Skybox(Image("skyboxes/loft/Newport_Loft_Ref.hdr")));
 159         skyboxes.push_back(Skybox(Image("skyboxes/monumentValley/Road_to_MonumentValley_Ref.hdr")));
 160         skyboxes.push_back(Skybox(Image("skyboxes/factory/Factory_Catwalk_2k.hdr")));
 161
 162         pbrProg = new Program("pbrvert.glsl", "pbrfrag.glsl");
 163         glUseProgram(pbrProg->progId);
 164         pbr = new Model("models/newtonsCradle.gltf", *pbrProg);
 165
 166         glEnable(GL_DEPTH_TEST);
 167         glEnable(GL_CULL_FACE);
 168         // prevent edge artifacts in specular cubemaps
 169         glEnable(GL_TEXTURE_CUBE_MAP_SEAMLESS);
 170
 171         glViewport(0, 0, windowWidth, windowHeight);
 172 }
 173
 174 bool* keyStates = new bool[256];
 175
 176 void keyboard(unsigned char key, int x, int y) {
 177         keyStates[key] = true;
 178         if (key == 'z')
 179                 activeSkybox = (activeSkybox + 1) % skyboxes.size();
 180         if (key == 'x')
 181                 activeLight = (activeLight + 1) % lights.size();
 182 }
 183
 184 void keyboardUp(unsigned char key, int x, int y) {
 185         keyStates[key] = false;
 186 }
 187
 188 void timer(int _) {
 189         float xSpeed = 0.f, ySpeed = 0.f, zSpeed = 0.f;
 190         if (keyStates['w'])
 191                 zSpeed = 0.1f;
 192         if (keyStates['s'])
 193                 zSpeed = -0.1f;
 194         if (keyStates['a'])
 195                 xSpeed = 0.1f;
 196         if (keyStates['d'])
 197                 xSpeed = -0.1f;
 198         if (keyStates['q'])
 199                 ySpeed = 0.1f;
 200         if (keyStates['e'])
 201                 ySpeed = -0.1f;
 202
 203         if (keyStates['j']) lights[activeLight].pos.z += 0.1f;
 204         if (keyStates['k']) lights[activeLight].pos.z -= 0.1f;
 205         if (keyStates['h']) lights[activeLight].pos.x -= 0.1f;
 206         if (keyStates['l']) lights[activeLight].pos.x += 0.1f;
 207         if (keyStates['m']) lights[activeLight].pos.y -= 0.1f;
 208         if (keyStates['n']) lights[activeLight].pos.y += 0.1f;
 209
 210         camPos.x += xSpeed * sin(yaw) + zSpeed * cos(yaw);
 211         camPos.y += ySpeed;
 212         camPos.z += zSpeed * sin(yaw) - xSpeed * cos(yaw);
 213         glutPostRedisplay();
 214         glutTimerFunc(16, timer, 0);
 215 }
 216
 217 int prevMouseX, prevMouseY;
 218 bool firstMouse = true;
 219
 220 void motion(int x, int y) {
 221         if (firstMouse) {
 222                 prevMouseX = x;
 223                 prevMouseY = y;
 224                 firstMouse = false;
 225         }
 226         int dx = x - prevMouseX, dy = y - prevMouseY;
 227
 228         prevMouseX = x;
 229         prevMouseY = y;
 230
 231         const float sensitivity = 0.005f;
 232         yaw += dx * sensitivity;
 233         pitch -= dy * sensitivity;
 234
 235         glm::vec3 front;
 236         front.x = cos(pitch) * cos(yaw);
 237         front.y = sin(pitch);
 238         front.z = cos(pitch) * sin(yaw);
 239         camFront = glm::normalize(front);
 240
 241         if (pitch < -1.57079632679 || pitch >= 1.57079632679) {
 242                 camUp = glm::vec3(0, -1, 0);
 243         } else {
 244                 camUp = glm::vec3(0, 1, 0);
 245         }
 246 }
 247
 248 void mouse(int button, int state, int x, int y) {
 249         if (button == GLUT_LEFT_BUTTON && state == GLUT_UP)
 250                 firstMouse = true;
 251 }
 252
 253 void reshape(int newWidth, int newHeight) {
 254         windowWidth = newWidth, windowHeight = newHeight;
 255 }
 256
 257 int main(int argc, char** argv) {
 258         glutInit(&argc, argv);
 259         glutInitDisplayMode(GLUT_DEPTH|GLUT_DOUBLE|GLUT_RGB|GLUT_3_2_CORE_PROFILE);
 260         glutInitWindowSize(windowWidth, windowHeight);
 261         int win = glutCreateWindow("Physically Based Rendering");
 262         makeRetina();
 263         glutDisplayFunc(display);
 264         glutReshapeFunc(reshape);
 265
 266         glewInit();
 267
 268         init();
 269
 270         glutKeyboardFunc(keyboard);
 271         glutKeyboardUpFunc(keyboardUp);
 272         glutTimerFunc(16, timer, 0);
 273         glutMotionFunc(motion);
 274         glutMouseFunc(mouse);
 275
 276         glutMainLoop();
 277
 278         return 0;
 279 }
 280