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 #include "util.hpp"
  24 #include "ik.hpp"
  25
  26 #pragma clang diagnostic ignored "-Wdeprecated-declarations"
  27
  28 using namespace std;
  29
  30 GLuint lightVao;
  31
  32 Program *textureProg, *plainProg, *reflectProg, *pbrProg;
  33
  34 std::vector<Skybox> skyboxes;
  35 int activeSkybox = 0;
  36
  37 Assimp::Importer importer; // Need to keep this around, otherwise stuff disappears!
  38 Model *sceneModel;
  39
  40 glm::vec3 camPos = {0, 0, -5}, camFront = {0, 0, 1}, camUp = {0, 1, 0};
  41 float fov = glm::radians(30.f), znear = 0.01f, zfar = 10000.f;
  42 float yaw = 1.57, pitch = 0;
  43
  44 struct Light {
  45         glm::mat4 trans;
  46         glm::vec3 color;
  47 };
  48
  49 std::vector<Light> lights;
  50
  51 bool discoLights = false;
  52
  53 int windowWidth = 800, windowHeight = 600;
  54
  55 float aspect() {
  56         return (float)windowWidth / (float)windowHeight;
  57 }
  58
  59 glm::mat4 projMat() {
  60         return glm::perspective(fov, aspect(), znear, zfar);
  61 }
  62
  63 glm::mat4 viewMat() {
  64         return glm::lookAt(camPos, camPos + camFront, camUp);
  65 }
  66
  67 void setProjectionAndViewUniforms(GLuint progId) {
  68         GLuint projLoc = glGetUniformLocation(progId, "projection");
  69         glm::mat4 proj = projMat();
  70         glUniformMatrix4fv(projLoc, 1, GL_FALSE, glm::value_ptr(proj));
  71
  72         GLuint viewLoc = glGetUniformLocation(progId, "view");
  73         glm::mat4 view = viewMat();
  74         glUniformMatrix4fv(viewLoc, 1, GL_FALSE, glm::value_ptr(view));
  75
  76         GLuint camPosLoc = glGetUniformLocation(progId, "camPos");
  77         glUniform3fv(camPosLoc, 1, glm::value_ptr(camPos));
  78 }
  79
  80 void setLightColorAndPos(GLuint progId, glm::vec3 lightPos, glm::vec4 lightColor) {
  81         GLuint lightColorLoc = glGetUniformLocation(progId, "lightColor");
  82         glUniform4fv(lightColorLoc, 1, glm::value_ptr(lightColor));
  83
  84         GLuint lightPosLoc = glGetUniformLocation(progId, "vLightPos");
  85         glUniform3fv(lightPosLoc, 1, glm::value_ptr(lightPos));
  86
  87         GLuint viewPosLoc = glGetUniformLocation(progId, "vViewPos");
  88         glUniform3fv(viewPosLoc, 1, glm::value_ptr(camPos));
  89 }
  90
  91 void drawLight(Light &light) {
  92         glUseProgram(plainProg->progId);
  93         glBindVertexArray(lightVao);
  94         setProjectionAndViewUniforms(plainProg->progId);
  95         glm::mat4 model = glm::scale(light.trans, glm::vec3(0.2));
  96         GLuint modelLoc = glGetUniformLocation(plainProg->progId, "model");
  97         glUniformMatrix4fv(modelLoc, 1, GL_FALSE, glm::value_ptr(model));
  98
  99         GLuint colorLoc = glGetUniformLocation(plainProg->progId, "color");
 100         glUniform4fv(colorLoc, 1, glm::value_ptr(light.color));
 101
 102         glDrawArrays(GL_TRIANGLES, 0, 36);
 103 }
 104
 105 int findNodeTrans(const struct aiNode *n, const struct aiString name, glm::mat4 *dest) {
 106         if (strcmp(n->mName.data, name.data) == 0) {
 107                 *dest = aiMatrixToMat4(n->mTransformation);
 108                 return 0;
 109         }
 110         for (int i = 0; i < n->mNumChildren; i++) {
 111                 if (findNodeTrans(n->mChildren[i], name, dest) == 0) {
 112                         glm::mat4 t = aiMatrixToMat4(n->mTransformation);
 113                         *dest = t * *dest;
 114                         return 0;
 115                 }
 116         }
 117         return 1;
 118 }
 119
 120 glm::mat4 worldSpaceToModelSpace(aiNode *node, glm::mat4 m) {
 121         aiNode *parent = node;
 122         glm::mat4 res = m;
 123         std::vector<glm::mat4> trans;
 124         while (parent != nullptr) {
 125                 /* res = res * glm::inverse(aiMatrixToMat4(parent->mTransformation)); */
 126                 trans.push_back(glm::inverse(aiMatrixToMat4(parent->mTransformation)));
 127                 parent = parent->mParent;
 128         }
 129         while (!trans.empty()) { res = trans.back() * res; trans.pop_back(); }
 130         return res;
 131 }
 132
 133 void display() {
 134         glClearColor(0.5, 0.5, 0.5, 1);
 135         glClear(GL_COLOR_BUFFER_BIT|GL_DEPTH_BUFFER_BIT);
 136         glViewport(0, 0, windowWidth * 2, windowHeight * 2);
 137
 138         float d = (float)glutGet(GLUT_ELAPSED_TIME) * 0.001f;
 139
 140         glUseProgram(getUtilProg()->progId);
 141         setProjectionAndViewUniforms(getUtilProg()->progId);
 142
 143         glUseProgram(pbrProg->progId);
 144         setProjectionAndViewUniforms(pbrProg->progId);
 145
 146         size_t numLights = lights.size() + (discoLights ? 3 : 0);
 147         glm::vec3 lightPositions[numLights], lightColors[numLights];
 148         for (int i = 0; i < lights.size(); i++) {
 149                 lightPositions[i] = glm::vec3(lights[i].trans[3]);
 150                 lightColors[i] = lights[i].color;
 151         }
 152
 153         if (discoLights) {
 154                 for (int i = numLights - 3; i < numLights; i++) {
 155                         auto m = glm::translate(glm::mat4(1.f), glm::vec3(-2.5, 0, 0));
 156                         m = glm::rotate(m, glm::radians(d * 100 + i * 30), glm::vec3(1, 0, 0));
 157                         m = glm::rotate(m, glm::radians(d * 100 + i * 30), glm::vec3(0, 1, 0));
 158                         m = glm::rotate(m, glm::radians(d * 100 + i * 30), glm::vec3(0, 0, 1));
 159                         lightPositions[i] = glm::vec3(m * glm::vec4(5, 0, 0, 1));
 160                         lightColors[i] = glm::vec3(0.2);
 161                         if (i % 3 == 0) lightColors[i].x = sin(d);
 162                         if (i % 3 == 1) lightColors[i].y = cos(d * 3);
 163                         if (i % 3 == 2) lightColors[i].z = cos(d);
 164                 }
 165         }
 166
 167         glUniform1ui(glGetUniformLocation(pbrProg->progId, "numLights"), numLights);
 168         glUniform3fv(glGetUniformLocation(pbrProg->progId, "lightPositions"), numLights, glm::value_ptr(lightPositions[0]));
 169         glUniform3fv(glGetUniformLocation(pbrProg->progId, "lightColors"), numLights, glm::value_ptr(lightColors[0]));
 170
 171 #ifdef COWEDBOY_IK
 172         {
 173                 glm::vec3 targetPos(sin(d) * 2 + 3, -2, 1);
 174                 Light targetLight = { glm::translate(glm::mat4(1), targetPos), {0.5, 1, 1}  };
 175                 drawLight(targetLight);
 176                 inverseKinematics(*sceneModel->find("Shoulder.L"), *sceneModel->find("Finger.L"), targetPos);
 177
 178                 targetPos = { sin(d * 2) * 2 - 5, 2.5, 0 };
 179                 targetLight = { glm::translate(glm::mat4(1), targetPos), {1, 1, 0.5}  };
 180                 drawLight(targetLight);
 181                 inverseKinematics(*sceneModel->find("Shoulder.R"), *sceneModel->find("Finger.R"), targetPos);
 182         }
 183 #endif
 184
 185         sceneModel->draw(skyboxes[activeSkybox], d * 1000);
 186
 187         for (Light &light: lights) drawLight(light);
 188
 189         // TODO: restore
 190         /* if (discoLights) { */
 191         /*      for (int i = numLights - 3; i < numLights; i++) { */
 192         /*              Light l = { lightPositions[i], lightColors[i] }; */
 193         /*              drawLight(l); */
 194         /*      } */
 195         /* } */
 196
 197         skyboxes[activeSkybox].draw(projMat(), viewMat());
 198
 199         glutSwapBuffers();
 200 }
 201
 202 void setupLightBuffers(GLuint progId) {
 203         auto vertices = cube();
 204         GLuint verticesSize = 36 * 3 * sizeof(GLfloat);
 205
 206         glGenVertexArrays(1, &lightVao);
 207         GLuint vbo;
 208         glBindVertexArray(lightVao);
 209         glGenBuffers(1, &vbo);
 210         glBindBuffer(GL_ARRAY_BUFFER, vbo);
 211         glBufferData(GL_ARRAY_BUFFER, verticesSize, NULL, GL_STATIC_DRAW);
 212         glBufferSubData(GL_ARRAY_BUFFER, 0, verticesSize, glm::value_ptr(vertices[0]));
 213         GLuint posLoc = glGetAttribLocation(progId, "vPosition");
 214         glEnableVertexAttribArray(posLoc);
 215         glVertexAttribPointer(posLoc, 3, GL_FLOAT, GL_FALSE, 0, 0);
 216 }
 217
 218
 219 void init() {
 220         initUtilProg();
 221
 222         plainProg = new Program("plainvertex.glsl", "plainfrag.glsl");
 223         glUseProgram(plainProg->progId);
 224         setupLightBuffers(plainProg->progId);
 225         plainProg->validate();
 226
 227         skyboxes.push_back(Skybox(Image("skyboxes/loft/Newport_Loft_Ref.hdr")));
 228         skyboxes.push_back(Skybox(Image("skyboxes/wooden_lounge_8k.hdr")));
 229         skyboxes.push_back(Skybox(Image("skyboxes/machine_shop_02_8k.hdr")));
 230         skyboxes.push_back(Skybox(Image("skyboxes/pink_sunrise_8k.hdr")));
 231
 232         pbrProg = new Program("pbrvert.glsl", "pbrfrag.glsl");
 233         glUseProgram(pbrProg->progId);
 234
 235         const std::string scenePath = "models/mipmapping.glb";
 236         const aiScene *scene = importer.ReadFile(scenePath, aiProcess_Triangulate | aiProcess_CalcTangentSpace | aiProcess_GenNormals | aiProcess_FlipUVs);
 237         if (!scene) {
 238                 std::cerr << importer.GetErrorString() << std::endl;
 239                 exit(1);
 240         }
 241
 242         if (scene->mNumCameras > 0) {
 243                 aiCamera *cam = scene->mCameras[0];
 244                 glm::mat4 camTrans;
 245                 if (findNodeTrans(scene->mRootNode, cam->mName, &camTrans) != 0)
 246                         abort(); // there must be a node with the same name as camera
 247
 248                 camPos = { camTrans[3][0], camTrans[3][1], camTrans[3][2] };
 249
 250                 glm::vec3 camLookAt = glm::vec3(cam->mLookAt.x, cam->mLookAt.y, cam->mLookAt.z);
 251                 camFront = camLookAt - camPos;
 252
 253                 camUp = glm::vec3(cam->mUp.x, cam->mUp.y, cam->mUp.z);
 254
 255                 fov = cam->mHorizontalFOV;
 256                 // TODO: aspectRatio = cam->mAspect;
 257                 znear = cam->mClipPlaneNear;
 258                 zfar = cam->mClipPlaneFar;
 259         }
 260
 261         for (int i = 0; i < scene->mNumLights; i++) {
 262                 aiLight *light = scene->mLights[i];
 263                 glm::mat4 trans; findNodeTrans(scene->mRootNode, light->mName, &trans);
 264                 glm::vec3 col = { light->mColorAmbient.r, light->mColorAmbient.g, light->mColorAmbient.b };
 265                 Light l = { trans, col };
 266                 lights.push_back(l);
 267         }
 268
 269         sceneModel = new Model(scene, *pbrProg);
 270
 271         glEnable(GL_DEPTH_TEST);
 272         glEnable(GL_CULL_FACE);
 273         // prevent edge artifacts in specular cubemaps
 274         glEnable(GL_TEXTURE_CUBE_MAP_SEAMLESS);
 275
 276         glViewport(0, 0, windowWidth, windowHeight);
 277 }
 278
 279 bool keyStates[256] = {false};
 280
 281 void keyboard(unsigned char key, int x, int y) {
 282         keyStates[key] = true;
 283         if (key == 'z')
 284                 activeSkybox = (activeSkybox + 1) % skyboxes.size();
 285         if (key == 'c')
 286                 discoLights = !discoLights;
 287 }
 288
 289 void keyboardUp(unsigned char key, int x, int y) {
 290         keyStates[key] = false;
 291 }
 292
 293 #define ENABLE_MOVEMENT
 294
 295 void timer(int _) {
 296 #ifdef ENABLE_MOVEMENT
 297         float xSpeed = 0.f, ySpeed = 0.f, zSpeed = 0.f;
 298
 299 #pragma clang diagnostic push
 300 #pragma clang diagnostic ignored "-Wchar-subscripts"
 301         if (keyStates['w'])
 302                 zSpeed = 0.1f;
 303         if (keyStates['s'])
 304                 zSpeed = -0.1f;
 305         if (keyStates['a'])
 306                 xSpeed = 0.1f;
 307         if (keyStates['d'])
 308                 xSpeed = -0.1f;
 309         if (keyStates['q'])
 310                 ySpeed = 0.1f;
 311         if (keyStates['e'])
 312                 ySpeed = -0.1f;
 313 #pragma clang diagnostic pop
 314
 315         camPos.x += xSpeed * sin(yaw) + zSpeed * cos(yaw);
 316         camPos.y += ySpeed;
 317         camPos.z += zSpeed * sin(yaw) - xSpeed * cos(yaw);
 318 #endif
 319         glutPostRedisplay();
 320         glutTimerFunc(16, timer, 0);
 321 }
 322
 323 int prevMouseX, prevMouseY;
 324 bool firstMouse = true;
 325
 326 void motion(int x, int y) {
 327 #ifdef ENABLE_MOVEMENT
 328         if (firstMouse) {
 329                 prevMouseX = x;
 330                 prevMouseY = y;
 331                 firstMouse = false;
 332         }
 333         int dx = x - prevMouseX, dy = y - prevMouseY;
 334
 335         prevMouseX = x;
 336         prevMouseY = y;
 337
 338         const float sensitivity = 0.005f;
 339         yaw += dx * sensitivity;
 340         pitch -= dy * sensitivity;
 341
 342         glm::vec3 front;
 343         front.x = cos(pitch) * cos(yaw);
 344         front.y = sin(pitch);
 345         front.z = cos(pitch) * sin(yaw);
 346         camFront = glm::normalize(front);
 347
 348         if (pitch < -1.57079632679 || pitch >= 1.57079632679) {
 349                 camUp = glm::vec3(0, -1, 0);
 350         } else {
 351                 camUp = glm::vec3(0, 1, 0);
 352         }
 353 #endif
 354 }
 355
 356 void mouse(int button, int state, int x, int y) {
 357         if (button == GLUT_LEFT_BUTTON && state == GLUT_UP)
 358                 firstMouse = true;
 359 }
 360
 361 void reshape(int newWidth, int newHeight) {
 362         windowWidth = newWidth, windowHeight = newHeight;
 363 }
 364
 365 int main(int argc, char** argv) {
 366         glutInit(&argc, argv);
 367         glutInitDisplayMode(GLUT_DEPTH|GLUT_DOUBLE|GLUT_RGB|GLUT_3_2_CORE_PROFILE);
 368         glutInitWindowSize(windowWidth, windowHeight);
 369         glutCreateWindow("Physically Based Rendering");
 370         glutDisplayFunc(display);
 371         glutReshapeFunc(reshape);
 372
 373         glewInit();
 374
 375         init();
 376
 377         glutKeyboardFunc(keyboard);
 378         glutKeyboardUpFunc(keyboardUp);
 379         glutTimerFunc(16, timer, 0);
 380         glutMotionFunc(motion);
 381         glutMouseFunc(mouse);
 382
 383         glutMainLoop();
 384
 385         return 0;
 386 }
 387