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 #else
   9 #include <OpenGL/glew.h>
  10 #endif
  11 #include <GLUT/glut.h>
  12 #include "shapes.hpp"
  13 #include <glm/glm.hpp>
  14 #include <glm/ext.hpp>
  15 #include <glm/gtc/type_ptr.hpp>
  16 #include "model.hpp"
  17 #include "program.hpp"
  18 #include "skybox.hpp"
  19 #include "image.hpp"
  20
  21 #pragma clang diagnostic ignored "-Wdeprecated-declarations"
  22
  23 using namespace std;
  24
  25 GLuint lightVao;
  26
  27 Program *textureProg, *plainProg, *reflectProg, *pbrProg;
  28
  29 std::vector<Skybox> skyboxes;
  30 int activeSkybox = 0;
  31
  32 Model *chest, *mirrorCube, *pbr;
  33
  34 glm::vec3 camPos   = glm::vec3(0.0f, 0.0f,  -5.f);
  35 glm::vec3 camFront = glm::vec3(0.0f, 0.0f, 1.0f);
  36 glm::vec3 camUp    = glm::vec3(0.0f, 1.0f,  0.0f);
  37 float yaw = 1.57, pitch = 0;
  38
  39 struct Light {
  40         glm::vec3 pos;
  41         glm::vec3 color;
  42 };
  43
  44 std::vector<Light> lights = {
  45         { glm::vec3(5, 2, -5), glm::vec3(1) },
  46         { glm::vec3(0, 2, -5), glm::vec3(1) },
  47         { glm::vec3(-5, 2, -5), glm::vec3(1) },
  48 };
  49
  50 int activeLight = 0;
  51
  52 bool discoLights = false;
  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[6], lightColors[6];
 119         for (int i = 0; i < 3; i++) {
 120                 lightPositions[i] = lights[i].pos;
 121                 lightColors[i] = lights[i].color;
 122         }
 123
 124         for (int i = 3; i < 6; i++) {
 125                 if (discoLights) {
 126                         auto m = glm::translate(glm::mat4(1.f), glm::vec3(-2.5, 0, 0));
 127                         m = glm::rotate(m, glm::radians(d * 100 + i * 30), glm::vec3(1, 0, 0));
 128                         m = glm::rotate(m, glm::radians(d * 100 + i * 30), glm::vec3(0, 1, 0));
 129                         m = glm::rotate(m, glm::radians(d * 100 + i * 30), glm::vec3(0, 0, 1));
 130                         lightPositions[i] = glm::vec3(m * glm::vec4(5, 0, 0, 1));
 131                         lightColors[i] = glm::vec3(0.2);
 132                         if (i == 3) lightColors[i].x = sin(d);
 133                         if (i == 4) lightColors[i].y = cos(d * 3);
 134                         if (i == 5) lightColors[i].z = cos(d);
 135                 } else {
 136                         lightPositions[i] = glm::vec3(0);
 137                         lightColors[i] = glm::vec3(0);
 138                 }
 139         }
 140
 141         glUniform3fv(glGetUniformLocation(pbrProg->progId, "lightPositions"), 6, glm::value_ptr(lightPositions[0]));
 142         glUniform3fv(glGetUniformLocation(pbrProg->progId, "lightColors"), 6, glm::value_ptr(lightColors[0]));
 143
 144         /* pbr->getRoot()->model = glm::rotate(glm::mat4(1.f), glm::radians(d * 10), glm::vec3(0, 1, 0)); */
 145         pbr->draw(skyboxes[activeSkybox], d * 1000);
 146
 147         for (Light &light: lights) drawLight(light);
 148
 149         if (discoLights) {
 150                 for (int i = 3; i < 6; i++) {
 151                         Light l { lightPositions[i], lightColors[i] };
 152                         drawLight(l);
 153                 }
 154         }
 155
 156         skyboxes[activeSkybox].draw(projMat(), viewMat());
 157
 158         glutSwapBuffers();
 159 }
 160
 161 void setupLightBuffers(GLuint progId) {
 162         auto vertices = cube();
 163         GLuint verticesSize = 36 * 3 * sizeof(GLfloat);
 164
 165         glGenVertexArrays(1, &lightVao);
 166         GLuint vbo;
 167         glBindVertexArray(lightVao);
 168         glGenBuffers(1, &vbo);
 169         glBindBuffer(GL_ARRAY_BUFFER, vbo);
 170         glBufferData(GL_ARRAY_BUFFER, verticesSize, NULL, GL_STATIC_DRAW);
 171         glBufferSubData(GL_ARRAY_BUFFER, 0, verticesSize, glm::value_ptr(vertices[0]));
 172         GLuint posLoc = glGetAttribLocation(progId, "vPosition");
 173         glEnableVertexAttribArray(posLoc);
 174         glVertexAttribPointer(posLoc, 3, GL_FLOAT, GL_FALSE, 0, 0);
 175 }
 176
 177 void init() {
 178         plainProg = new Program("plainvertex.glsl", "plainfrag.glsl");
 179         glUseProgram(plainProg->progId);
 180         setupLightBuffers(plainProg->progId);
 181         plainProg->validate();
 182
 183         skyboxes.push_back(Skybox(Image("skyboxes/loft/Newport_Loft_Ref.hdr")));
 184         skyboxes.push_back(Skybox(Image("skyboxes/monumentValley/Road_to_MonumentValley_Ref.hdr")));
 185         skyboxes.push_back(Skybox(Image("skyboxes/factory/Factory_Catwalk_2k.hdr")));
 186
 187         pbrProg = new Program("pbrvert.glsl", "pbrfrag.glsl");
 188         glUseProgram(pbrProg->progId);
 189         pbr = new Model("models/newtonsCradle.glb", *pbrProg);
 190
 191         glEnable(GL_DEPTH_TEST);
 192         glEnable(GL_CULL_FACE);
 193         // prevent edge artifacts in specular cubemaps
 194         glEnable(GL_TEXTURE_CUBE_MAP_SEAMLESS);
 195
 196         glViewport(0, 0, windowWidth, windowHeight);
 197 }
 198
 199 bool* keyStates = new bool[256];
 200
 201 void keyboard(unsigned char key, int x, int y) {
 202         keyStates[key] = true;
 203         if (key == 'z')
 204                 activeSkybox = (activeSkybox + 1) % skyboxes.size();
 205         if (key == 'x')
 206                 activeLight = (activeLight + 1) % lights.size();
 207         if (key == 'c')
 208                 discoLights = !discoLights;
 209 }
 210
 211 void keyboardUp(unsigned char key, int x, int y) {
 212         keyStates[key] = false;
 213 }
 214
 215 void timer(int _) {
 216         float xSpeed = 0.f, ySpeed = 0.f, zSpeed = 0.f;
 217         if (keyStates['w'])
 218                 zSpeed = 0.1f;
 219         if (keyStates['s'])
 220                 zSpeed = -0.1f;
 221         if (keyStates['a'])
 222                 xSpeed = 0.1f;
 223         if (keyStates['d'])
 224                 xSpeed = -0.1f;
 225         if (keyStates['q'])
 226                 ySpeed = 0.1f;
 227         if (keyStates['e'])
 228                 ySpeed = -0.1f;
 229
 230         if (keyStates['j']) lights[activeLight].pos.z += 0.1f;
 231         if (keyStates['k']) lights[activeLight].pos.z -= 0.1f;
 232         if (keyStates['h']) lights[activeLight].pos.x -= 0.1f;
 233         if (keyStates['l']) lights[activeLight].pos.x += 0.1f;
 234         if (keyStates['m']) lights[activeLight].pos.y -= 0.1f;
 235         if (keyStates['n']) lights[activeLight].pos.y += 0.1f;
 236
 237         camPos.x += xSpeed * sin(yaw) + zSpeed * cos(yaw);
 238         camPos.y += ySpeed;
 239         camPos.z += zSpeed * sin(yaw) - xSpeed * cos(yaw);
 240         glutPostRedisplay();
 241         glutTimerFunc(16, timer, 0);
 242 }
 243
 244 int prevMouseX, prevMouseY;
 245 bool firstMouse = true;
 246
 247 void motion(int x, int y) {
 248         if (firstMouse) {
 249                 prevMouseX = x;
 250                 prevMouseY = y;
 251                 firstMouse = false;
 252         }
 253         int dx = x - prevMouseX, dy = y - prevMouseY;
 254
 255         prevMouseX = x;
 256         prevMouseY = y;
 257
 258         const float sensitivity = 0.005f;
 259         yaw += dx * sensitivity;
 260         pitch -= dy * sensitivity;
 261
 262         glm::vec3 front;
 263         front.x = cos(pitch) * cos(yaw);
 264         front.y = sin(pitch);
 265         front.z = cos(pitch) * sin(yaw);
 266         camFront = glm::normalize(front);
 267
 268         if (pitch < -1.57079632679 || pitch >= 1.57079632679) {
 269                 camUp = glm::vec3(0, -1, 0);
 270         } else {
 271                 camUp = glm::vec3(0, 1, 0);
 272         }
 273 }
 274
 275 void mouse(int button, int state, int x, int y) {
 276         if (button == GLUT_LEFT_BUTTON && state == GLUT_UP)
 277                 firstMouse = true;
 278 }
 279
 280 void reshape(int newWidth, int newHeight) {
 281         windowWidth = newWidth, windowHeight = newHeight;
 282 }
 283
 284 int main(int argc, char** argv) {
 285         glutInit(&argc, argv);
 286         glutInitDisplayMode(GLUT_DEPTH|GLUT_DOUBLE|GLUT_RGB|GLUT_3_2_CORE_PROFILE);
 287         glutInitWindowSize(windowWidth, windowHeight);
 288         int win = glutCreateWindow("Physically Based Rendering");
 289         glutDisplayFunc(display);
 290         glutReshapeFunc(reshape);
 291
 292         glewInit();
 293
 294         init();
 295
 296         glutKeyboardFunc(keyboard);
 297         glutKeyboardUpFunc(keyboardUp);
 298         glutTimerFunc(16, timer, 0);
 299         glutMotionFunc(motion);
 300         glutMouseFunc(mouse);
 301
 302         glutMainLoop();
 303
 304         return 0;
 305 }
 306