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 <assimp/Importer.hpp>
  17 #include <assimp/scene.h>
  18 #include <assimp/postprocess.h>
  19 #include "model.hpp"
  20 #include "program.hpp"
  21 #include "skybox.hpp"
  22 #include "image.hpp"
  23
  24 #pragma clang diagnostic ignored "-Wdeprecated-declarations"
  25
  26 using namespace std;
  27
  28 GLuint lightVao;
  29
  30 Program *textureProg, *plainProg, *reflectProg, *pbrProg;
  31
  32 std::vector<Skybox> skyboxes;
  33 int activeSkybox = 0;
  34
  35 Assimp::Importer importer; // Need to keep this around, otherwise stuff disappears!
  36 Model *sceneModel;
  37
  38 glm::vec3 camPos = {0, 0, -5}, camFront = {0, 0, 1}, camUp = {0, 1, 0};
  39 float fov = glm::radians(30.f), znear = 0.01f, zfar = 10000.f;
  40 float yaw = 1.57, pitch = 0;
  41
  42 struct Light {
  43         glm::vec3 pos;
  44         glm::vec3 color;
  45 };
  46
  47 std::vector<Light> lights = {
  48         { glm::vec3(5, 2, -5), glm::vec3(1) },
  49         { glm::vec3(0, 2, -5), glm::vec3(1) },
  50         { glm::vec3(-5, 2, -5), glm::vec3(1) },
  51 };
  52
  53 int activeLight = 0;
  54
  55 bool discoLights = false;
  56
  57 int windowWidth = 800, windowHeight = 600;
  58
  59 float aspect() {
  60         return (float)windowWidth / (float)windowHeight;
  61 }
  62
  63 glm::mat4 projMat() {
  64         return glm::perspective(fov, aspect(), znear, zfar);
  65 }
  66
  67 glm::mat4 viewMat() {
  68         return glm::lookAt(camPos, camPos + camFront, camUp);
  69 }
  70
  71 void setProjectionAndViewUniforms(GLuint progId) {
  72         GLuint projLoc = glGetUniformLocation(progId, "projection");
  73         glm::mat4 proj = projMat();
  74         glUniformMatrix4fv(projLoc, 1, GL_FALSE, glm::value_ptr(proj));
  75
  76         GLuint viewLoc = glGetUniformLocation(progId, "view");
  77         glm::mat4 view = viewMat();
  78         glUniformMatrix4fv(viewLoc, 1, GL_FALSE, glm::value_ptr(view));
  79
  80         GLuint camPosLoc = glGetUniformLocation(progId, "camPos");
  81         glUniform3fv(camPosLoc, 1, glm::value_ptr(camPos));
  82 }
  83
  84 void setLightColorAndPos(GLuint progId, glm::vec3 lightPos, glm::vec4 lightColor) {
  85         GLuint lightColorLoc = glGetUniformLocation(progId, "lightColor");
  86         glUniform4fv(lightColorLoc, 1, glm::value_ptr(lightColor));
  87
  88         GLuint lightPosLoc = glGetUniformLocation(progId, "vLightPos");
  89         glUniform3fv(lightPosLoc, 1, glm::value_ptr(lightPos));
  90
  91         GLuint viewPosLoc = glGetUniformLocation(progId, "vViewPos");
  92         glUniform3fv(viewPosLoc, 1, glm::value_ptr(camPos));
  93 }
  94
  95 void drawLight(Light &light) {
  96         glUseProgram(plainProg->progId);
  97         glBindVertexArray(lightVao);
  98         setProjectionAndViewUniforms(plainProg->progId);
  99         glm::mat4 model = glm::translate(glm::mat4(1.f), light.pos);
 100         model = glm::scale(model, glm::vec3(0.2));
 101         GLuint modelLoc = glGetUniformLocation(plainProg->progId, "model");
 102         glUniformMatrix4fv(modelLoc, 1, GL_FALSE, glm::value_ptr(model));
 103
 104         GLuint colorLoc = glGetUniformLocation(plainProg->progId, "color");
 105         glUniform4fv(colorLoc, 1, glm::value_ptr(light.color));
 106
 107         glDrawArrays(GL_TRIANGLES, 0, 36);
 108 }
 109
 110
 111 void display() {
 112         glClearColor(0.5, 0.5, 0.5, 1);
 113         glClear(GL_COLOR_BUFFER_BIT|GL_DEPTH_BUFFER_BIT);
 114         glViewport(0, 0, windowWidth * 2, windowHeight * 2);
 115
 116         float d = (float)glutGet(GLUT_ELAPSED_TIME) * 0.001f;
 117
 118         glUseProgram(pbrProg->progId);
 119         setProjectionAndViewUniforms(pbrProg->progId);
 120
 121         glm::vec3 lightPositions[6], lightColors[6];
 122         for (int i = 0; i < 3; i++) {
 123                 lightPositions[i] = lights[i].pos;
 124                 lightColors[i] = lights[i].color;
 125         }
 126
 127         for (int i = 3; i < 6; i++) {
 128                 if (discoLights) {
 129                         auto m = glm::translate(glm::mat4(1.f), glm::vec3(-2.5, 0, 0));
 130                         m = glm::rotate(m, glm::radians(d * 100 + i * 30), glm::vec3(1, 0, 0));
 131                         m = glm::rotate(m, glm::radians(d * 100 + i * 30), glm::vec3(0, 1, 0));
 132                         m = glm::rotate(m, glm::radians(d * 100 + i * 30), glm::vec3(0, 0, 1));
 133                         lightPositions[i] = glm::vec3(m * glm::vec4(5, 0, 0, 1));
 134                         lightColors[i] = glm::vec3(0.2);
 135                         if (i == 3) lightColors[i].x = sin(d);
 136                         if (i == 4) lightColors[i].y = cos(d * 3);
 137                         if (i == 5) lightColors[i].z = cos(d);
 138                 } else {
 139                         lightPositions[i] = glm::vec3(0);
 140                         lightColors[i] = glm::vec3(0);
 141                 }
 142         }
 143
 144         glUniform3fv(glGetUniformLocation(pbrProg->progId, "lightPositions"), 6, glm::value_ptr(lightPositions[0]));
 145         glUniform3fv(glGetUniformLocation(pbrProg->progId, "lightColors"), 6, glm::value_ptr(lightColors[0]));
 146
 147         /* pbr->getRoot()->model = glm::rotate(glm::mat4(1.f), glm::radians(d * 10), glm::vec3(0, 1, 0)); */
 148         sceneModel->draw(skyboxes[activeSkybox], d * 1000);
 149
 150         for (Light &light: lights) drawLight(light);
 151
 152         if (discoLights) {
 153                 for (int i = 3; i < 6; i++) {
 154                         Light l { lightPositions[i], lightColors[i] };
 155                         drawLight(l);
 156                 }
 157         }
 158
 159         skyboxes[activeSkybox].draw(projMat(), viewMat());
 160
 161         glutSwapBuffers();
 162 }
 163
 164 void setupLightBuffers(GLuint progId) {
 165         auto vertices = cube();
 166         GLuint verticesSize = 36 * 3 * sizeof(GLfloat);
 167
 168         glGenVertexArrays(1, &lightVao);
 169         GLuint vbo;
 170         glBindVertexArray(lightVao);
 171         glGenBuffers(1, &vbo);
 172         glBindBuffer(GL_ARRAY_BUFFER, vbo);
 173         glBufferData(GL_ARRAY_BUFFER, verticesSize, NULL, GL_STATIC_DRAW);
 174         glBufferSubData(GL_ARRAY_BUFFER, 0, verticesSize, glm::value_ptr(vertices[0]));
 175         GLuint posLoc = glGetAttribLocation(progId, "vPosition");
 176         glEnableVertexAttribArray(posLoc);
 177         glVertexAttribPointer(posLoc, 3, GL_FLOAT, GL_FALSE, 0, 0);
 178 }
 179
 180 int findNodeTrans(struct aiNode *n, const struct aiString name, glm::mat4 *dest) {
 181         if (strcmp(n->mName.data, name.data) == 0) {
 182                 *dest = aiMatrixToMat4(n->mTransformation);
 183                 return 0;
 184         }
 185         for (int i = 0; i < n->mNumChildren; i++) {
 186                 if (findNodeTrans(n->mChildren[i], name, dest) == 0) {
 187                         glm::mat4 t = aiMatrixToMat4(n->mTransformation);
 188                         *dest = t * *dest;
 189                         return 0;
 190                 }
 191         }
 192         return 1;
 193 }
 194
 195 void init() {
 196         plainProg = new Program("plainvertex.glsl", "plainfrag.glsl");
 197         glUseProgram(plainProg->progId);
 198         setupLightBuffers(plainProg->progId);
 199         plainProg->validate();
 200
 201         skyboxes.push_back(Skybox(Image("skyboxes/wooden_lounge_8k.hdr")));
 202         skyboxes.push_back(Skybox(Image("skyboxes/machine_shop_02_8k.hdr")));
 203         skyboxes.push_back(Skybox(Image("skyboxes/pink_sunrise_8k.hdr")));
 204
 205         pbrProg = new Program("pbrvert.glsl", "pbrfrag.glsl");
 206         glUseProgram(pbrProg->progId);
 207
 208         const aiScene *scene = importer.ReadFile("models/newtonsCradle.glb", aiProcess_Triangulate | aiProcess_CalcTangentSpace | aiProcess_GenNormals | aiProcess_FlipUVs);
 209         if (!scene) {
 210                 std::cerr << importer.GetErrorString() << std::endl;
 211                 exit(1);
 212         }
 213
 214         if (scene->mNumCameras > 0) {
 215                 struct aiCamera *cam = scene->mCameras[0];
 216                 glm::mat4 camTrans;
 217                 if (findNodeTrans(scene->mRootNode, cam->mName, &camTrans) != 0)
 218                         abort(); // there must be a node with the same name as camera
 219
 220                 camPos = { camTrans[3][0], camTrans[3][1], camTrans[3][2] };
 221
 222                 glm::vec3 camLookAt = glm::vec3(cam->mLookAt.x, cam->mLookAt.y, cam->mLookAt.z);
 223                 camFront = camLookAt - camPos;
 224
 225                 camUp = glm::vec3(cam->mUp.x, cam->mUp.y, cam->mUp.z);
 226
 227                 fov = cam->mHorizontalFOV;
 228                 // TODO: aspectRatio = cam->mAspect;
 229                 znear = cam->mClipPlaneNear;
 230                 zfar = cam->mClipPlaneFar;
 231         }
 232
 233         sceneModel = new Model(scene, *pbrProg);
 234
 235         glEnable(GL_DEPTH_TEST);
 236         glEnable(GL_CULL_FACE);
 237         // prevent edge artifacts in specular cubemaps
 238         glEnable(GL_TEXTURE_CUBE_MAP_SEAMLESS);
 239
 240         glViewport(0, 0, windowWidth, windowHeight);
 241 }
 242
 243 bool keyStates[256] = {false};
 244
 245 void keyboard(unsigned char key, int x, int y) {
 246         keyStates[key] = true;
 247         if (key == 'z')
 248                 activeSkybox = (activeSkybox + 1) % skyboxes.size();
 249         if (key == 'x')
 250                 activeLight = (activeLight + 1) % lights.size();
 251         if (key == 'c')
 252                 discoLights = !discoLights;
 253 }
 254
 255 void keyboardUp(unsigned char key, int x, int y) {
 256         keyStates[key] = false;
 257 }
 258
 259 void timer(int _) {
 260         float xSpeed = 0.f, ySpeed = 0.f, zSpeed = 0.f;
 261         if (keyStates['w'])
 262                 zSpeed = 0.1f;
 263         if (keyStates['s'])
 264                 zSpeed = -0.1f;
 265         if (keyStates['a'])
 266                 xSpeed = 0.1f;
 267         if (keyStates['d'])
 268                 xSpeed = -0.1f;
 269         if (keyStates['q'])
 270                 ySpeed = 0.1f;
 271         if (keyStates['e'])
 272                 ySpeed = -0.1f;
 273
 274         if (keyStates['j']) lights[activeLight].pos.z += 0.1f;
 275         if (keyStates['k']) lights[activeLight].pos.z -= 0.1f;
 276         if (keyStates['h']) lights[activeLight].pos.x -= 0.1f;
 277         if (keyStates['l']) lights[activeLight].pos.x += 0.1f;
 278         if (keyStates['m']) lights[activeLight].pos.y -= 0.1f;
 279         if (keyStates['n']) lights[activeLight].pos.y += 0.1f;
 280
 281         camPos.x += xSpeed * sin(yaw) + zSpeed * cos(yaw);
 282         camPos.y += ySpeed;
 283         camPos.z += zSpeed * sin(yaw) - xSpeed * cos(yaw);
 284         glutPostRedisplay();
 285         glutTimerFunc(16, timer, 0);
 286 }
 287
 288 int prevMouseX, prevMouseY;
 289 bool firstMouse = true;
 290
 291 void motion(int x, int y) {
 292         if (firstMouse) {
 293                 prevMouseX = x;
 294                 prevMouseY = y;
 295                 firstMouse = false;
 296         }
 297         int dx = x - prevMouseX, dy = y - prevMouseY;
 298
 299         prevMouseX = x;
 300         prevMouseY = y;
 301
 302         const float sensitivity = 0.005f;
 303         yaw += dx * sensitivity;
 304         pitch -= dy * sensitivity;
 305
 306         glm::vec3 front;
 307         front.x = cos(pitch) * cos(yaw);
 308         front.y = sin(pitch);
 309         front.z = cos(pitch) * sin(yaw);
 310         camFront = glm::normalize(front);
 311
 312         if (pitch < -1.57079632679 || pitch >= 1.57079632679) {
 313                 camUp = glm::vec3(0, -1, 0);
 314         } else {
 315                 camUp = glm::vec3(0, 1, 0);
 316         }
 317 }
 318
 319 void mouse(int button, int state, int x, int y) {
 320         if (button == GLUT_LEFT_BUTTON && state == GLUT_UP)
 321                 firstMouse = true;
 322 }
 323
 324 void reshape(int newWidth, int newHeight) {
 325         windowWidth = newWidth, windowHeight = newHeight;
 326 }
 327
 328 int main(int argc, char** argv) {
 329         glutInit(&argc, argv);
 330         glutInitDisplayMode(GLUT_DEPTH|GLUT_DOUBLE|GLUT_RGB|GLUT_3_2_CORE_PROFILE);
 331         glutInitWindowSize(windowWidth, windowHeight);
 332         glutCreateWindow("Physically Based Rendering");
 333         glutDisplayFunc(display);
 334         glutReshapeFunc(reshape);
 335
 336         glewInit();
 337
 338         init();
 339
 340         glutKeyboardFunc(keyboard);
 341         glutKeyboardUpFunc(keyboardUp);
 342         glutTimerFunc(16, timer, 0);
 343         glutMotionFunc(motion);
 344         glutMouseFunc(mouse);
 345
 346         glutMainLoop();
 347
 348         return 0;
 349 }
 350