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 , testBlockType(true)
  21 , cam()
  22 , chunk()
  23 , light_position(17.0f, 17.0f, 17.0f)
  24 , light_color(1.0f, 1.0f, 1.0f)
  25 , light_power(100.0f)
  26 , m_handle(0)
  27 , v_handle(0)
  28 , mv_handle(0)
  29 , mvp_handle(0)
  30 , light_position_handle(0)
  31 , light_color_handle(0)
  32 , light_power_handle(0)
  33 , running(false)
  34 , front(false)
  35 , back(false)
  36 , left(false)
  37 , right(false)
  38 , up(false)
  39 , down(false) {
  40         GLContext::EnableVSync();
  41         GLContext::EnableDepthTest();
  42         GLContext::EnableBackfaceCulling();
  43         program.LoadShader(
  44                 GL_VERTEX_SHADER,
  45                 "#version 330 core\n"
  46                 "layout(location = 0) in vec3 vtx_position;\n"
  47                 "layout(location = 1) in vec3 vtx_color;\n"
  48                 "layout(location = 2) in vec3 vtx_normal;\n"
  49                 "uniform mat4 M;\n"
  50                 "uniform mat4 V;\n"
  51                 "uniform mat4 MVP;\n"
  52                 "uniform vec3 light_position;\n"
  53                 "out vec3 frag_color;\n"
  54                 "out vec3 vtx_world;\n"
  55                 "out vec3 normal;\n"
  56                 "out vec3 eye;\n"
  57                 "out vec3 light_direction;\n"
  58                 "void main() {\n"
  59                         "vec4 v = vec4(vtx_position, 1);\n"
  60                         "gl_Position = MVP * v;\n"
  61                         "vtx_world = (M * v).xyz;\n"
  62                         "vec3 vtx_camera = (V * M * v).xyz;\n"
  63                         "eye = vec3(0, 0, 0) - vtx_camera;\n"
  64                         "vec3 light_camera = (V * v).xyz;\n"
  65                         "light_direction = light_position + eye;\n"
  66                         "normal = (V * M * vec4(vtx_normal, 0)).xyz;\n"
  67                         "frag_color = vtx_color;\n"
  68                 "}\n"
  69         );
  70         program.LoadShader(
  71                 GL_FRAGMENT_SHADER,
  72                 "#version 330 core\n"
  73                 "in vec3 frag_color;\n"
  74                 "in vec3 vtx_world;\n"
  75                 "in vec3 normal;\n"
  76                 "in vec3 eye;\n"
  77                 "in vec3 light_direction;\n"
  78                 "uniform mat4 MV;\n"
  79                 "uniform vec3 light_position;\n"
  80                 "uniform vec3 light_color;\n"
  81                 "uniform float light_power;\n"
  82                 "out vec3 color;\n"
  83                 "void main() {\n"
  84                         "vec3 ambient = vec3(0.1, 0.1, 0.1) * frag_color;\n"
  85                         "vec3 specular = vec3(0.3, 0.3, 0.3);\n"
  86                         "float distance = length(light_position - vtx_world);\n"
  87                         "vec3 n = normalize(normal);\n"
  88                         "vec3 l = normalize(light_direction);\n"
  89                         "float cos_theta = clamp(dot(n, l), 0, 1);\n"
  90                         "vec3 E = normalize(eye);\n"
  91                         "vec3 R = reflect(-l, n);\n"
  92                         "float cos_alpha = clamp(dot(E, R), 0, 1);\n"
  93                         "color = ambient"
  94                                 " + frag_color * light_color * light_power * cos_theta / (distance * distance)"
  95                                 " + specular * light_color * light_power * pow(cos_alpha, 5) / (distance * distance);\n"
  96                 "}\n"
  97         );
  98         program.Link();
  99         if (!program.Linked()) {
 100                 program.Log(std::cerr);
 101                 throw std::runtime_error("link program");
 102         }
 103
 104         GLuint VertexArrayID;
 105         glGenVertexArrays(1, &VertexArrayID);
 106         glBindVertexArray(VertexArrayID);
 107
 108         cam.Position(glm::vec3(0, 4, 4));
 109
 110         chunk.BlockAt(glm::vec3(0, 0, 0)) = Block(&testBlockType);
 111         chunk.BlockAt(glm::vec3(1, 0, 0)) = Block(&testBlockType);
 112         chunk.BlockAt(glm::vec3(1, 1, 0)) = Block(&testBlockType);
 113         chunk.BlockAt(glm::vec3(1, 1, 1)) = Block(&testBlockType);
 114         chunk.BlockAt(glm::vec3(2, 1, 1)) = Block(&testBlockType);
 115         chunk.BlockAt(glm::vec3(2, 2, 1)) = Block(&testBlockType);
 116         chunk.Invalidate();
 117
 118         m_handle = program.UniformLocation("M");
 119         v_handle = program.UniformLocation("V");
 120         mv_handle = program.UniformLocation("MV");
 121         mvp_handle = program.UniformLocation("MVP");
 122         light_position_handle = program.UniformLocation("light_position");
 123         light_color_handle = program.UniformLocation("light_color");
 124         light_power_handle = program.UniformLocation("light_power");
 125
 126         glClearColor(0.0, 0.0, 0.0, 1.0);
 127 }
 128
 129 Application::~Application() {
 130
 131 }
 132
 133
 134 void Application::Run() {
 135         running = true;
 136         Uint32 last = SDL_GetTicks();
 137         window.GrabMouse();
 138         while (running) {
 139                 Uint32 now = SDL_GetTicks();
 140                 int delta = now - last;
 141                 Loop(delta);
 142                 last = now;
 143         }
 144 }
 145
 146 void Application::Loop(int dt) {
 147         HandleEvents();
 148         Update(dt);
 149         Render();
 150 }
 151
 152
 153 void Application::HandleEvents() {
 154         SDL_Event event;
 155         while (SDL_PollEvent(&event)) {
 156                 switch (event.type) {
 157                         case SDL_KEYDOWN:
 158                         case SDL_KEYUP:
 159                                 switch (event.key.keysym.sym) {
 160                                         case SDLK_w:
 161                                                 front = event.key.state == SDL_PRESSED;
 162                                                 break;
 163                                         case SDLK_s:
 164                                                 back = event.key.state == SDL_PRESSED;
 165                                                 break;
 166                                         case SDLK_a:
 167                                                 left = event.key.state == SDL_PRESSED;
 168                                                 break;
 169                                         case SDLK_d:
 170                                                 right = event.key.state == SDL_PRESSED;
 171                                                 break;
 172                                         case SDLK_q:
 173                                                 up = event.key.state == SDL_PRESSED;
 174                                                 break;
 175                                         case SDLK_e:
 176                                                 down = event.key.state == SDL_PRESSED;
 177                                                 break;
 178                                 }
 179                                 break;
 180                         case SDL_MOUSEMOTION:
 181                                 cam.RotateYaw(event.motion.xrel * yaw_sensitivity);
 182                                 cam.RotatePitch(event.motion.yrel * pitch_sensitivity);
 183                                 break;
 184                         case SDL_QUIT:
 185                                 running = false;
 186                                 break;
 187                         case SDL_WINDOWEVENT:
 188                                 switch (event.window.event) {
 189                                         case SDL_WINDOWEVENT_RESIZED:
 190                                                 cam.Viewport(event.window.data1, event.window.data2);
 191                                                 break;
 192                                         default:
 193                                                 break;
 194                                 }
 195                                 break;
 196                         default:
 197                                 break;
 198                 }
 199         }
 200 }
 201
 202 void Application::Update(int dt) {
 203         glm::vec3 vel;
 204         if (right && !left) {
 205                 vel.x = move_velocity;
 206         } else if (left && !right) {
 207                 vel.x = -move_velocity;
 208         }
 209         if (up && !down) {
 210                 vel.y = move_velocity;
 211         } else if (down && !up) {
 212                 vel.y = -move_velocity;
 213         }
 214         if (back && !front) {
 215                 vel.z = move_velocity;
 216         } else if (front && !back) {
 217                 vel.z = -move_velocity;
 218         }
 219         cam.OrientationVelocity(vel);
 220
 221         cam.Update(dt);
 222 }
 223
 224 void Application::Render() {
 225         GLContext::Clear();
 226
 227         program.Use();
 228
 229         glm::mat4 m(1.0f);
 230         glm::mat4 mv(cam.View() * m);
 231         glm::mat4 mvp(cam.MakeMVP(m));
 232         glUniformMatrix4fv(m_handle, 1, GL_FALSE, &m[0][0]);
 233         glUniformMatrix4fv(v_handle, 1, GL_FALSE, &cam.View()[0][0]);
 234         glUniformMatrix4fv(mv_handle, 1, GL_FALSE, &mv[0][0]);
 235         glUniformMatrix4fv(mvp_handle, 1, GL_FALSE, &mvp[0][0]);
 236         glUniform3f(light_position_handle, light_position.x, light_position.y, light_position.z);
 237         glUniform3f(light_color_handle, light_color.x, light_color.y, light_color.z);
 238         glUniform1f(light_power_handle, light_power);
 239
 240         chunk.Draw();
 241
 242         window.Flip();
 243 }
 244
 245 }