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
  20 #pragma clang diagnostic ignored "-Wdeprecated-declarations"
  21
  22 using namespace std;
  23
  24 GLuint lightVao;
  25
  26 Program *textureProg, *plainProg;
  27 Skybox *skybox;
  28
  29 glm::vec3 camPos   = glm::vec3(0.0f, 0.0f,  0.0f);
  30 glm::vec3 camFront = glm::vec3(0.0f, 0.0f, 1.0f);
  31 glm::vec3 camUp    = glm::vec3(0.0f, 1.0f,  0.0f);
  32 float yaw = 1.57, pitch = 0;
  33 bool doScale, doRotate, doTranslate;
  34 Model *chest;
  35 glm::vec3 lightPos(0);
  36
  37 const int WIDTH = 800, HEIGHT = 600;
  38 const float ASPECT = (float)WIDTH / (float)HEIGHT;
  39
  40 glm::mat4 projMat() {
  41         return glm::perspective(glm::radians(45.f), ASPECT, 0.01f, 10000.f);
  42 }
  43
  44 glm::mat4 viewMat() {
  45         return glm::lookAt(camPos, camPos + camFront, camUp);
  46 }
  47
  48 void setProjectionAndViewUniforms(GLuint progId) {
  49         GLuint projLoc = glGetUniformLocation(progId, "projection");
  50         glm::mat4 proj = projMat();
  51         glUniformMatrix4fv(projLoc, 1, GL_FALSE, glm::value_ptr(proj));
  52
  53         GLuint viewLoc = glGetUniformLocation(progId, "view");
  54         glm::mat4 view = viewMat();
  55         glUniformMatrix4fv(viewLoc, 1, GL_FALSE, glm::value_ptr(view));
  56 }
  57
  58 void setLightColorAndPos(GLuint progId, glm::vec3 lightPos, glm::vec4 lightColor) {
  59         GLuint lightColorLoc = glGetUniformLocation(progId, "lightColor");
  60         glUniform4fv(lightColorLoc, 1, glm::value_ptr(lightColor));
  61
  62         GLuint lightPosLoc = glGetUniformLocation(progId, "vLightPos");
  63         glUniform3fv(lightPosLoc, 1, glm::value_ptr(lightPos));
  64
  65         GLuint viewPosLoc = glGetUniformLocation(progId, "vViewPos");
  66         glUniform3fv(viewPosLoc, 1, glm::value_ptr(camPos));
  67 }
  68
  69 void drawLight(float d, glm::vec3 lightPos, glm::vec4 lightColor) {
  70         glUseProgram(plainProg->progId);
  71         glBindVertexArray(lightVao);
  72         setProjectionAndViewUniforms(plainProg->progId);
  73         glm::mat4 model = glm::translate(glm::mat4(1.f), lightPos);
  74         model = glm::scale(model, glm::vec3(0.2));
  75         GLuint modelLoc = glGetUniformLocation(plainProg->progId, "model");
  76         glUniformMatrix4fv(modelLoc, 1, GL_FALSE, glm::value_ptr(model));
  77
  78         GLuint colorLoc = glGetUniformLocation(plainProg->progId, "color");
  79         glm::vec4 color(lightColor);
  80         glUniform4fv(colorLoc, 1, glm::value_ptr(color));
  81
  82         glDrawArrays(GL_TRIANGLES, 0, 36);
  83 }
  84
  85
  86 void display() {
  87         glClearColor(0.5, 0.5, 0.5, 1);
  88         glClear(GL_COLOR_BUFFER_BIT|GL_DEPTH_BUFFER_BIT);
  89         float d = (float)glutGet(GLUT_ELAPSED_TIME) * 0.001f;
  90
  91         skybox->draw(projMat(), viewMat());
  92
  93         glm::vec4 lightColor(1, 1, 1, 1);
  94
  95         drawLight(d, lightPos, lightColor);
  96
  97         glUseProgram(textureProg->progId);
  98         setProjectionAndViewUniforms(textureProg->progId);
  99         setLightColorAndPos(textureProg->progId, lightPos, lightColor);
 100
 101         Model::Node *top = chest->find("top");
 102         top->model = glm::translate(glm::mat4(1), glm::vec3(0, 1, -1));
 103         top->model = glm::rotate(top->model, sin(d / 2.5f) * 0.5f, glm::vec3(1, 0, 0));
 104         top->model = glm::translate(top->model, glm::vec3(0, -1, 1));
 105
 106         /* Model::Node *jewels = chest->find("jewels"); */
 107         /* jewels->model = glm::scale(glm::mat4(1), glm::vec3((sin(d) + 1.2f) / 2.f)); */
 108
 109         /* Model::Node *lock = chest->find("lock"); */
 110         /* lock->model = glm::translate(glm::mat4(1), glm::vec3(0.22610, 3.36478, -0.75649)); */
 111         /* lock->model = glm::rotate(lock->model, (d / 2.5f), glm::vec3(0, 1, 0.4)); */
 112         /* lock->model = glm::translate(lock->model, -glm::vec3(0.22610, 3.36478, -0.75649)); */
 113
 114         /* Model::Node *key = chest->find("key"); */
 115         /* key->model = glm::translate(glm::mat4(1), glm::vec3(0, 0, sin(d))); */
 116
 117         /* chest->getRoot()->model = glm::translate(glm::mat4(1), lightPos); */
 118         chest->draw();
 119
 120         glutSwapBuffers();
 121 }
 122
 123 void setupLightBuffers(GLuint progId) {
 124         auto vertices = cube();
 125         GLuint verticesSize = 36 * 3 * sizeof(GLfloat);
 126
 127         glGenVertexArrays(1, &lightVao);
 128         GLuint vbo;
 129         glBindVertexArray(lightVao);
 130         glGenBuffers(1, &vbo);
 131         glBindBuffer(GL_ARRAY_BUFFER, vbo);
 132         glBufferData(GL_ARRAY_BUFFER, verticesSize, NULL, GL_STATIC_DRAW);
 133         glBufferSubData(GL_ARRAY_BUFFER, 0, verticesSize, glm::value_ptr(vertices[0]));
 134         GLuint posLoc = glGetAttribLocation(progId, "vPosition");
 135         glEnableVertexAttribArray(posLoc);
 136         glVertexAttribPointer(posLoc, 3, GL_FLOAT, GL_FALSE, 0, 0);
 137 }
 138
 139 void validateProgram(GLuint progId) {
 140         glValidateProgram(progId);
 141
 142         GLint success;
 143         glGetProgramiv(progId, GL_VALIDATE_STATUS, &success);
 144         if (!success) {
 145                 GLchar log[1024];
 146                 glGetProgramInfoLog(progId, sizeof(log), NULL, log);
 147                 fprintf(stderr, "error: %s\n", log);
 148                 exit(1);
 149         }
 150 }
 151
 152 void init() {
 153         plainProg = new Program("plainvertex.glsl", "plainfrag.glsl");
 154         glUseProgram(plainProg->progId);
 155         setupLightBuffers(plainProg->progId);
 156         validateProgram(plainProg->progId);
 157
 158         textureProg = new Program("texturevertex.glsl", "texturefrag.glsl");
 159         glUseProgram(textureProg->progId);
 160
 161         chest = new Model("models/chest.dae", *textureProg);
 162
 163         std::vector<std::string> faces = {
 164                 "models/skybox/right.jpg",
 165                 "models/skybox/left.jpg",
 166                 "models/skybox/top.jpg",
 167                 "models/skybox/bottom.jpg",
 168                 "models/skybox/front.jpg",
 169                 "models/skybox/back.jpg"
 170         };
 171         skybox = new Skybox(faces);
 172
 173         glEnable(GL_DEPTH_TEST);
 174         glEnable(GL_CULL_FACE);
 175 }
 176
 177 bool* keyStates = new bool[256];
 178
 179 void keyboard(unsigned char key, int x, int y) {
 180         keyStates[key] = true;
 181         if (key == 'z')
 182                 doScale = !doScale;
 183         if (key == 'x')
 184                 doRotate = !doRotate;
 185         if (key == 'c')
 186                 doTranslate = !doTranslate;
 187 }
 188
 189 void keyboardUp(unsigned char key, int x, int y) {
 190         keyStates[key] = false;
 191 }
 192
 193 void timer(int _) {
 194         float xSpeed = 0.f, ySpeed = 0.f, zSpeed = 0.f;
 195         if (keyStates['w'])
 196                 zSpeed = 0.1f;
 197         if (keyStates['s'])
 198                 zSpeed = -0.1f;
 199         if (keyStates['a'])
 200                 xSpeed = 0.1f;
 201         if (keyStates['d'])
 202                 xSpeed = -0.1f;
 203         if (keyStates['q'])
 204                 ySpeed = 0.1f;
 205         if (keyStates['e'])
 206                 ySpeed = -0.1f;
 207
 208         if (keyStates['j']) lightPos.z += 0.1f;
 209         if (keyStates['k']) lightPos.z -= 0.1f;
 210         if (keyStates['h']) lightPos.x -= 0.1f;
 211         if (keyStates['l']) lightPos.x += 0.1f;
 212         if (keyStates['m']) lightPos.y -= 0.1f;
 213         if (keyStates['n']) lightPos.y += 0.1f;
 214
 215         camPos.x += xSpeed * sin(yaw) + zSpeed * cos(yaw);
 216         camPos.y += ySpeed;
 217         camPos.z += zSpeed * sin(yaw) - xSpeed * cos(yaw);
 218         glutPostRedisplay();
 219         glutTimerFunc(16, timer, 0);
 220 }
 221
 222 int prevMouseX, prevMouseY;
 223 bool firstMouse = true;
 224
 225 void motion(int x, int y) {
 226         if (firstMouse) {
 227                 prevMouseX = x;
 228                 prevMouseY = y;
 229                 firstMouse = false;
 230         }
 231         int dx = x - prevMouseX, dy = y - prevMouseY;
 232
 233         prevMouseX = x;
 234         prevMouseY = y;
 235
 236         const float sensitivity = 0.005f;
 237         yaw += dx * sensitivity;
 238         pitch -= dy * sensitivity;
 239
 240         glm::vec3 front;
 241         front.x = cos(pitch) * cos(yaw);
 242         front.y = sin(pitch);
 243         front.z = cos(pitch) * sin(yaw);
 244         camFront = glm::normalize(front);
 245
 246         if (pitch < -1.57079632679 || pitch >= 1.57079632679) {
 247                 camUp = glm::vec3(0, -1, 0);
 248         } else {
 249                 camUp = glm::vec3(0, 1, 0);
 250         }
 251 }
 252
 253 void mouse(int button, int state, int x, int y) {
 254         if (button == GLUT_LEFT_BUTTON && state == GLUT_UP)
 255                 firstMouse = true;
 256 }
 257
 258 int main(int argc, char** argv) {
 259         glutInit(&argc, argv);
 260         glutInitDisplayMode(GLUT_DEPTH|GLUT_DOUBLE|GLUT_RGB|GLUT_3_2_CORE_PROFILE);
 261         glutInitWindowSize(WIDTH, HEIGHT);
 262         int win = glutCreateWindow("Hello Triangle");
 263         glutDisplayFunc(display);
 264
 265         glewInit();
 266
 267         init();
 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