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
 112         float d = (float)glutGet(GLUT_ELAPSED_TIME) * 0.001f;
 113
 114         glUseProgram(pbrProg->progId);
 115         setProjectionAndViewUniforms(pbrProg->progId);
 116
 117         glm::vec3 lightPositions[4], lightColors[4];
 118         for (int i = 0; i < 4; i++) {
 119                 lightPositions[i] = lights[i].pos;
 120                 lightColors[i] = lights[i].color;
 121         }
 122
 123         glUniform3fv(glGetUniformLocation(pbrProg->progId, "lightPositions"), 4, glm::value_ptr(lightPositions[0]));
 124         glUniform3fv(glGetUniformLocation(pbrProg->progId, "lightColors"), 4, glm::value_ptr(lightColors[0]));
 125
 126         pbr->draw(skyboxes[activeSkybox]);
 127
 128         for (Light &light: lights) drawLight(light);
 129
 130         skyboxes[activeSkybox].draw(projMat(), viewMat());
 131
 132         glutSwapBuffers();
 133 }
 134
 135 void setupLightBuffers(GLuint progId) {
 136         auto vertices = cube();
 137         GLuint verticesSize = 36 * 3 * sizeof(GLfloat);
 138
 139         glGenVertexArrays(1, &lightVao);
 140         GLuint vbo;
 141         glBindVertexArray(lightVao);
 142         glGenBuffers(1, &vbo);
 143         glBindBuffer(GL_ARRAY_BUFFER, vbo);
 144         glBufferData(GL_ARRAY_BUFFER, verticesSize, NULL, GL_STATIC_DRAW);
 145         glBufferSubData(GL_ARRAY_BUFFER, 0, verticesSize, glm::value_ptr(vertices[0]));
 146         GLuint posLoc = glGetAttribLocation(progId, "vPosition");
 147         glEnableVertexAttribArray(posLoc);
 148         glVertexAttribPointer(posLoc, 3, GL_FLOAT, GL_FALSE, 0, 0);
 149 }
 150
 151 void init() {
 152         plainProg = new Program("plainvertex.glsl", "plainfrag.glsl");
 153         glUseProgram(plainProg->progId);
 154         setupLightBuffers(plainProg->progId);
 155         plainProg->validate();
 156
 157         skyboxes.push_back(Skybox(Image("skyboxes/loft/Newport_Loft_Ref.hdr")));
 158         skyboxes.push_back(Skybox(Image("skyboxes/monumentValley/Road_to_MonumentValley_Ref.hdr")));
 159         skyboxes.push_back(Skybox(Image("skyboxes/factory/Factory_Catwalk_2k.hdr")));
 160
 161         pbrProg = new Program("pbrvert.glsl", "pbrfrag.glsl");
 162         glUseProgram(pbrProg->progId);
 163         pbr = new Model("models/sphereMetal.gltf", *pbrProg);
 164
 165         glEnable(GL_DEPTH_TEST);
 166         glEnable(GL_CULL_FACE);
 167         // prevent edge artifacts in specular cubemaps
 168         glEnable(GL_TEXTURE_CUBE_MAP_SEAMLESS);
 169 }
 170
 171 bool* keyStates = new bool[256];
 172
 173 void keyboard(unsigned char key, int x, int y) {
 174         keyStates[key] = true;
 175         if (key == 'z')
 176                 activeSkybox = (activeSkybox + 1) % skyboxes.size();
 177         if (key == 'x')
 178                 activeLight = (activeLight + 1) % lights.size();
 179 }
 180
 181 void keyboardUp(unsigned char key, int x, int y) {
 182         keyStates[key] = false;
 183 }
 184
 185 void timer(int _) {
 186         float xSpeed = 0.f, ySpeed = 0.f, zSpeed = 0.f;
 187         if (keyStates['w'])
 188                 zSpeed = 0.1f;
 189         if (keyStates['s'])
 190                 zSpeed = -0.1f;
 191         if (keyStates['a'])
 192                 xSpeed = 0.1f;
 193         if (keyStates['d'])
 194                 xSpeed = -0.1f;
 195         if (keyStates['q'])
 196                 ySpeed = 0.1f;
 197         if (keyStates['e'])
 198                 ySpeed = -0.1f;
 199
 200         if (keyStates['j']) lights[activeLight].pos.z += 0.1f;
 201         if (keyStates['k']) lights[activeLight].pos.z -= 0.1f;
 202         if (keyStates['h']) lights[activeLight].pos.x -= 0.1f;
 203         if (keyStates['l']) lights[activeLight].pos.x += 0.1f;
 204         if (keyStates['m']) lights[activeLight].pos.y -= 0.1f;
 205         if (keyStates['n']) lights[activeLight].pos.y += 0.1f;
 206
 207         camPos.x += xSpeed * sin(yaw) + zSpeed * cos(yaw);
 208         camPos.y += ySpeed;
 209         camPos.z += zSpeed * sin(yaw) - xSpeed * cos(yaw);
 210         glutPostRedisplay();
 211         glutTimerFunc(16, timer, 0);
 212 }
 213
 214 int prevMouseX, prevMouseY;
 215 bool firstMouse = true;
 216
 217 void motion(int x, int y) {
 218         if (firstMouse) {
 219                 prevMouseX = x;
 220                 prevMouseY = y;
 221                 firstMouse = false;
 222         }
 223         int dx = x - prevMouseX, dy = y - prevMouseY;
 224
 225         prevMouseX = x;
 226         prevMouseY = y;
 227
 228         const float sensitivity = 0.005f;
 229         yaw += dx * sensitivity;
 230         pitch -= dy * sensitivity;
 231
 232         glm::vec3 front;
 233         front.x = cos(pitch) * cos(yaw);
 234         front.y = sin(pitch);
 235         front.z = cos(pitch) * sin(yaw);
 236         camFront = glm::normalize(front);
 237
 238         if (pitch < -1.57079632679 || pitch >= 1.57079632679) {
 239                 camUp = glm::vec3(0, -1, 0);
 240         } else {
 241                 camUp = glm::vec3(0, 1, 0);
 242         }
 243 }
 244
 245 void mouse(int button, int state, int x, int y) {
 246         if (button == GLUT_LEFT_BUTTON && state == GLUT_UP)
 247                 firstMouse = true;
 248 }
 249
 250 void reshape(int newWidth, int newHeight) {
 251         glViewport(0, 0, newWidth * 2, newHeight * 2);
 252         windowWidth = newWidth, windowHeight = newHeight;
 253 }
 254
 255 int main(int argc, char** argv) {
 256         glutInit(&argc, argv);
 257         glutInitDisplayMode(GLUT_DEPTH|GLUT_DOUBLE|GLUT_RGB|GLUT_3_2_CORE_PROFILE);
 258         glutInitWindowSize(windowWidth, windowHeight);
 259         int win = glutCreateWindow("Physically Based Rendering");
 260         glutDisplayFunc(display);
 261         glutReshapeFunc(reshape);
 262
 263         glewInit();
 264
 265         init();
 266
 267         makeRetina();
 268
 269         glutKeyboardFunc(keyboard);
 270         glutKeyboardUpFunc(keyboardUp);
 271         glutTimerFunc(16, timer, 0);
 272         glutMotionFunc(motion);
 273         glutMouseFunc(mouse);
 274
 275         glutMainLoop();
 276
 277         return 0;
 278 }
 279