src/app.cpp

   1 #include "app.hpp"
   2
   3 #include <iostream>
   4 #include <stdexcept>
   5
   6
   7 namespace blank {
   8
   9 Application::Application()
  10 : init_sdl()
  11 , init_img()
  12 , init_gl()
  13 , window()
  14 , ctx(window.CreateContext())
  15 , init_glew()
  16 , program()
  17 , move_velocity(0.003f)
  18 , pitch_sensitivity(-0.0025f)
  19 , yaw_sensitivity(-0.001f)
  20 , cam()
  21 , model({
  22         // vertices
  23         {  0.0f,  0.0f,  1.0f }, // front, red
  24         {  1.0f,  0.0f,  1.0f },
  25         {  0.0f,  1.0f,  1.0f },
  26         {  1.0f,  0.0f,  1.0f },
  27         {  1.0f,  1.0f,  1.0f },
  28         {  0.0f,  1.0f,  1.0f },
  29         {  0.0f,  0.0f,  0.0f }, // back, cyan
  30         {  0.0f,  1.0f,  0.0f },
  31         {  1.0f,  0.0f,  0.0f },
  32         {  1.0f,  0.0f,  0.0f },
  33         {  0.0f,  1.0f,  0.0f },
  34         {  1.0f,  1.0f,  0.0f },
  35         {  0.0f,  1.0f,  0.0f }, // top, green
  36         {  0.0f,  1.0f,  1.0f },
  37         {  1.0f,  1.0f,  0.0f },
  38         {  1.0f,  1.0f,  0.0f },
  39         {  0.0f,  1.0f,  1.0f },
  40         {  1.0f,  1.0f,  1.0f },
  41         {  0.0f,  0.0f,  0.0f }, // bottom, magenta
  42         {  1.0f,  0.0f,  0.0f },
  43         {  0.0f,  0.0f,  1.0f },
  44         {  1.0f,  0.0f,  0.0f },
  45         {  1.0f,  0.0f,  1.0f },
  46         {  0.0f,  0.0f,  1.0f },
  47         {  0.0f,  0.0f,  0.0f }, // left, blue
  48         {  0.0f,  0.0f,  1.0f },
  49         {  0.0f,  1.0f,  0.0f },
  50         {  0.0f,  1.0f,  0.0f },
  51         {  0.0f,  0.0f,  1.0f },
  52         {  0.0f,  1.0f,  1.0f },
  53         {  1.0f,  0.0f,  0.0f }, // right, yellow
  54         {  1.0f,  1.0f,  0.0f },
  55         {  1.0f,  0.0f,  1.0f },
  56         {  1.0f,  0.0f,  1.0f },
  57         {  1.0f,  1.0f,  0.0f },
  58         {  1.0f,  1.0f,  1.0f },
  59 }, {
  60         // colors
  61         {  1.0f,  0.0f,  0.0f }, // front, red
  62         {  1.0f,  0.0f,  0.0f },
  63         {  1.0f,  0.0f,  0.0f },
  64         {  1.0f,  0.0f,  0.0f },
  65         {  1.0f,  0.0f,  0.0f },
  66         {  1.0f,  0.0f,  0.0f },
  67         {  0.0f,  1.0f,  1.0f }, // back, cyan
  68         {  0.0f,  1.0f,  1.0f },
  69         {  0.0f,  1.0f,  1.0f },
  70         {  0.0f,  1.0f,  1.0f },
  71         {  0.0f,  1.0f,  1.0f },
  72         {  0.0f,  1.0f,  1.0f },
  73         {  0.0f,  1.0f,  0.0f }, // top, green
  74         {  0.0f,  1.0f,  0.0f },
  75         {  0.0f,  1.0f,  0.0f },
  76         {  0.0f,  1.0f,  0.0f },
  77         {  0.0f,  1.0f,  0.0f },
  78         {  0.0f,  1.0f,  0.0f },
  79         {  1.0f,  0.0f,  1.0f }, // bottom, magenta
  80         {  1.0f,  0.0f,  1.0f },
  81         {  1.0f,  0.0f,  1.0f },
  82         {  1.0f,  0.0f,  1.0f },
  83         {  1.0f,  0.0f,  1.0f },
  84         {  1.0f,  0.0f,  1.0f },
  85         {  0.0f,  0.0f,  1.0f }, // left, blue
  86         {  0.0f,  0.0f,  1.0f },
  87         {  0.0f,  0.0f,  1.0f },
  88         {  0.0f,  0.0f,  1.0f },
  89         {  0.0f,  0.0f,  1.0f },
  90         {  0.0f,  0.0f,  1.0f },
  91         {  1.0f,  1.0f,  0.0f }, // right, yellow
  92         {  1.0f,  1.0f,  0.0f },
  93         {  1.0f,  1.0f,  0.0f },
  94         {  1.0f,  1.0f,  0.0f },
  95         {  1.0f,  1.0f,  0.0f },
  96         {  1.0f,  1.0f,  0.0f },
  97 }, {
  98         // normals
  99         {  0.0f,  0.0f,  1.0f }, // front, red
 100         {  0.0f,  0.0f,  1.0f },
 101         {  0.0f,  0.0f,  1.0f },
 102         {  0.0f,  0.0f,  1.0f },
 103         {  0.0f,  0.0f,  1.0f },
 104         {  0.0f,  0.0f,  1.0f },
 105         {  0.0f,  0.0f, -1.0f }, // back, cyan
 106         {  0.0f,  0.0f, -1.0f },
 107         {  0.0f,  0.0f, -1.0f },
 108         {  0.0f,  0.0f, -1.0f },
 109         {  0.0f,  0.0f, -1.0f },
 110         {  0.0f,  0.0f, -1.0f },
 111         {  0.0f,  1.0f,  0.0f }, // top, green
 112         {  0.0f,  1.0f,  0.0f },
 113         {  0.0f,  1.0f,  0.0f },
 114         {  0.0f,  1.0f,  0.0f },
 115         {  0.0f,  1.0f,  0.0f },
 116         {  0.0f,  1.0f,  0.0f },
 117         {  0.0f, -1.0f,  0.0f }, // bottom, magenta
 118         {  0.0f, -1.0f,  0.0f },
 119         {  0.0f, -1.0f,  0.0f },
 120         {  0.0f, -1.0f,  0.0f },
 121         {  0.0f, -1.0f,  0.0f },
 122         {  0.0f, -1.0f,  0.0f },
 123         { -1.0f,  0.0f,  0.0f }, // left, blue
 124         { -1.0f,  0.0f,  0.0f },
 125         { -1.0f,  0.0f,  0.0f },
 126         { -1.0f,  0.0f,  0.0f },
 127         { -1.0f,  0.0f,  0.0f },
 128         { -1.0f,  0.0f,  0.0f },
 129         {  1.0f,  0.0f,  0.0f }, // right, yellow
 130         {  1.0f,  0.0f,  0.0f },
 131         {  1.0f,  0.0f,  0.0f },
 132         {  1.0f,  0.0f,  0.0f },
 133         {  1.0f,  0.0f,  0.0f },
 134         {  1.0f,  0.0f,  0.0f },
 135 })
 136 , modelCtrl()
 137 , light_position(5.0f, 5.0f, 5.0f)
 138 , light_color(1.0f, 1.0f, 1.0f)
 139 , light_power(50.0f)
 140 , m_handle(0)
 141 , v_handle(0)
 142 , mv_handle(0)
 143 , mvp_handle(0)
 144 , light_position_handle(0)
 145 , light_color_handle(0)
 146 , light_power_handle(0)
 147 , running(false)
 148 , front(false)
 149 , back(false)
 150 , left(false)
 151 , right(false)
 152 , up(false)
 153 , down(false) {
 154         GLContext::EnableVSync();
 155         GLContext::EnableBackfaceCulling();
 156         program.LoadShader(
 157                 GL_VERTEX_SHADER,
 158                 "#version 330 core\n"
 159                 "layout(location = 0) in vec3 vtx_position;\n"
 160                 "layout(location = 1) in vec3 vtx_color;\n"
 161                 "layout(location = 2) in vec3 vtx_normal;\n"
 162                 "uniform mat4 M;\n"
 163                 "uniform mat4 V;\n"
 164                 "uniform mat4 MVP;\n"
 165                 "uniform vec3 light_position;\n"
 166                 "out vec3 frag_color;\n"
 167                 "out vec3 vtx_world;\n"
 168                 "out vec3 normal;\n"
 169                 "out vec3 eye;\n"
 170                 "out vec3 light_direction;\n"
 171                 "void main() {\n"
 172                         "vec4 v = vec4(vtx_position, 1);\n"
 173                         "gl_Position = MVP * v;\n"
 174                         "vtx_world = (M * v).xyz;\n"
 175                         "vec3 vtx_camera = (V * M * v).xyz;\n"
 176                         "eye = vec3(0, 0, 0) - vtx_camera;\n"
 177                         "vec3 light_camera = (V * v).xyz;\n"
 178                         "light_direction = light_position + eye;\n"
 179                         "normal = (V * M * vec4(vtx_normal, 0)).xyz;\n"
 180                         "frag_color = vtx_color;\n"
 181                 "}\n"
 182         );
 183         program.LoadShader(
 184                 GL_FRAGMENT_SHADER,
 185                 "#version 330 core\n"
 186                 "in vec3 frag_color;\n"
 187                 "in vec3 vtx_world;\n"
 188                 "in vec3 normal;\n"
 189                 "in vec3 eye;\n"
 190                 "in vec3 light_direction;\n"
 191                 "uniform mat4 MV;\n"
 192                 "uniform vec3 light_position;\n"
 193                 "uniform vec3 light_color;\n"
 194                 "uniform float light_power;\n"
 195                 "out vec3 color;\n"
 196                 "void main() {\n"
 197                         "vec3 ambient = vec3(0.1, 0.1, 0.1) * frag_color;\n"
 198                         "vec3 specular = vec3(0.3, 0.3, 0.3);\n"
 199                         "float distance = length(light_position - vtx_world);\n"
 200                         "vec3 n = normalize(normal);\n"
 201                         "vec3 l = normalize(light_direction);\n"
 202                         "float cos_theta = clamp(dot(n, l), 0, 1);\n"
 203                         "vec3 E = normalize(eye);\n"
 204                         "vec3 R = reflect(-l, n);\n"
 205                         "float cos_alpha = clamp(dot(E, R), 0, 1);\n"
 206                         "color = ambient"
 207                                 " + frag_color * light_color * light_power * cos_theta / (distance * distance)"
 208                                 " + specular * light_color * light_power * pow(cos_alpha, 5) / (distance * distance);\n"
 209                 "}\n"
 210         );
 211         program.Link();
 212         if (!program.Linked()) {
 213                 program.Log(std::cerr);
 214                 throw std::runtime_error("link program");
 215         }
 216
 217         GLuint VertexArrayID;
 218         glGenVertexArrays(1, &VertexArrayID);
 219         glBindVertexArray(VertexArrayID);
 220
 221         modelCtrl.Position(glm::vec3(0, 0, -4));
 222         cam.Position(glm::vec3(0, 0, 4));
 223
 224         m_handle = program.UniformLocation("M");
 225         v_handle = program.UniformLocation("V");
 226         mv_handle = program.UniformLocation("MV");
 227         mvp_handle = program.UniformLocation("MVP");
 228         light_position_handle = program.UniformLocation("light_position");
 229         light_color_handle = program.UniformLocation("light_color");
 230         light_power_handle = program.UniformLocation("light_power");
 231
 232         glClearColor(0.0, 0.0, 0.0, 1.0);
 233 }
 234
 235 Application::~Application() {
 236
 237 }
 238
 239
 240 void Application::Run() {
 241         running = true;
 242         Uint32 last = SDL_GetTicks();
 243         window.GrabMouse();
 244         while (running) {
 245                 Uint32 now = SDL_GetTicks();
 246                 int delta = now - last;
 247                 Loop(delta);
 248                 last = now;
 249         }
 250 }
 251
 252 void Application::Loop(int dt) {
 253         HandleEvents();
 254         Update(dt);
 255         Render();
 256 }
 257
 258
 259 void Application::HandleEvents() {
 260         SDL_Event event;
 261         while (SDL_PollEvent(&event)) {
 262                 switch (event.type) {
 263                         case SDL_KEYDOWN:
 264                         case SDL_KEYUP:
 265                                 switch (event.key.keysym.sym) {
 266                                         case SDLK_w:
 267                                                 front = event.key.state == SDL_PRESSED;
 268                                                 break;
 269                                         case SDLK_s:
 270                                                 back = event.key.state == SDL_PRESSED;
 271                                                 break;
 272                                         case SDLK_a:
 273                                                 left = event.key.state == SDL_PRESSED;
 274                                                 break;
 275                                         case SDLK_d:
 276                                                 right = event.key.state == SDL_PRESSED;
 277                                                 break;
 278                                         case SDLK_q:
 279                                                 up = event.key.state == SDL_PRESSED;
 280                                                 break;
 281                                         case SDLK_e:
 282                                                 down = event.key.state == SDL_PRESSED;
 283                                                 break;
 284                                 }
 285                                 break;
 286                         case SDL_MOUSEMOTION:
 287                                 cam.RotateYaw(event.motion.xrel * yaw_sensitivity);
 288                                 cam.RotatePitch(event.motion.yrel * pitch_sensitivity);
 289                                 break;
 290                         case SDL_QUIT:
 291                                 running = false;
 292                                 break;
 293                         case SDL_WINDOWEVENT:
 294                                 switch (event.window.event) {
 295                                         case SDL_WINDOWEVENT_RESIZED:
 296                                                 cam.Viewport(event.window.data1, event.window.data2);
 297                                                 break;
 298                                         default:
 299                                                 break;
 300                                 }
 301                                 break;
 302                         default:
 303                                 break;
 304                 }
 305         }
 306 }
 307
 308 void Application::Update(int dt) {
 309         glm::vec3 vel;
 310         if (right && !left) {
 311                 vel.x = move_velocity;
 312         } else if (left && !right) {
 313                 vel.x = -move_velocity;
 314         }
 315         if (up && !down) {
 316                 vel.y = move_velocity;
 317         } else if (down && !up) {
 318                 vel.y = -move_velocity;
 319         }
 320         if (back && !front) {
 321                 vel.z = move_velocity;
 322         } else if (front && !back) {
 323                 vel.z = -move_velocity;
 324         }
 325         cam.OrientationVelocity(vel);
 326
 327         cam.Update(dt);
 328         modelCtrl.Update(dt);
 329 }
 330
 331 void Application::Render() {
 332         glClear(GL_COLOR_BUFFER_BIT);
 333
 334         program.Use();
 335
 336         glm::mat4 m(modelCtrl.Transform());
 337         glm::mat4 mv(cam.View() * m);
 338         glm::mat4 mvp(cam.MakeMVP(m));
 339         glUniformMatrix4fv(m_handle, 1, GL_FALSE, &m[0][0]);
 340         glUniformMatrix4fv(v_handle, 1, GL_FALSE, &cam.View()[0][0]);
 341         glUniformMatrix4fv(mv_handle, 1, GL_FALSE, &mv[0][0]);
 342         glUniformMatrix4fv(mvp_handle, 1, GL_FALSE, &mvp[0][0]);
 343         glUniform3f(light_position_handle, light_position.x, light_position.y, light_position.z);
 344         glUniform3f(light_color_handle, light_color.x, light_color.y, light_color.z);
 345         glUniform1f(light_power_handle, light_power);
 346
 347         model.Draw();
 348
 349         window.Flip();
 350 }
 351
 352 }