src/app.cpp

   1 #include "app.hpp"
   2
   3 #include "geometry.hpp"
   4
   5 #include <iostream>
   6 #include <stdexcept>
   7
   8
   9 namespace blank {
  10
  11 Application::Application()
  12 : init_sdl()
  13 , init_img()
  14 , init_gl()
  15 , window()
  16 , ctx(window.CreateContext())
  17 , init_glew()
  18 , program()
  19 , move_velocity(0.003f)
  20 , pitch_sensitivity(-0.0025f)
  21 , yaw_sensitivity(-0.001f)
  22 , blockType()
  23 , cam()
  24 , chunk()
  25 , light_position(17.0f, 17.0f, 17.0f)
  26 , light_color(1.0f, 1.0f, 1.0f)
  27 , light_power(250.0f)
  28 , m_handle(0)
  29 , v_handle(0)
  30 , mv_handle(0)
  31 , mvp_handle(0)
  32 , light_position_handle(0)
  33 , light_color_handle(0)
  34 , light_power_handle(0)
  35 , running(false)
  36 , front(false)
  37 , back(false)
  38 , left(false)
  39 , right(false)
  40 , up(false)
  41 , down(false) {
  42         GLContext::EnableVSync();
  43         GLContext::EnableDepthTest();
  44         GLContext::EnableBackfaceCulling();
  45         program.LoadShader(
  46                 GL_VERTEX_SHADER,
  47                 "#version 330 core\n"
  48                 "layout(location = 0) in vec3 vtx_position;\n"
  49                 "layout(location = 1) in vec3 vtx_color;\n"
  50                 "layout(location = 2) in vec3 vtx_normal;\n"
  51                 "uniform mat4 M;\n"
  52                 "uniform mat4 V;\n"
  53                 "uniform mat4 MVP;\n"
  54                 "uniform vec3 light_position;\n"
  55                 "out vec3 frag_color;\n"
  56                 "out vec3 vtx_world;\n"
  57                 "out vec3 normal;\n"
  58                 "out vec3 eye;\n"
  59                 "out vec3 light_direction;\n"
  60                 "void main() {\n"
  61                         "vec4 v = vec4(vtx_position, 1);\n"
  62                         "gl_Position = MVP * v;\n"
  63                         "vtx_world = (M * v).xyz;\n"
  64                         "vec3 vtx_camera = (V * M * v).xyz;\n"
  65                         "eye = vec3(0, 0, 0) - vtx_camera;\n"
  66                         "vec3 light_camera = (V * v).xyz;\n"
  67                         "light_direction = light_position + eye;\n"
  68                         "normal = (V * M * vec4(vtx_normal, 0)).xyz;\n"
  69                         "frag_color = vtx_color;\n"
  70                 "}\n"
  71         );
  72         program.LoadShader(
  73                 GL_FRAGMENT_SHADER,
  74                 "#version 330 core\n"
  75                 "in vec3 frag_color;\n"
  76                 "in vec3 vtx_world;\n"
  77                 "in vec3 normal;\n"
  78                 "in vec3 eye;\n"
  79                 "in vec3 light_direction;\n"
  80                 "uniform mat4 MV;\n"
  81                 "uniform vec3 light_position;\n"
  82                 "uniform vec3 light_color;\n"
  83                 "uniform float light_power;\n"
  84                 "out vec3 color;\n"
  85                 "void main() {\n"
  86                         "vec3 ambient = vec3(0.1, 0.1, 0.1) * frag_color;\n"
  87                         "vec3 specular = vec3(0.3, 0.3, 0.3);\n"
  88                         "float distance = length(light_position - vtx_world);\n"
  89                         "vec3 n = normalize(normal);\n"
  90                         "vec3 l = normalize(light_direction);\n"
  91                         "float cos_theta = clamp(dot(n, l), 0, 1);\n"
  92                         "vec3 E = normalize(eye);\n"
  93                         "vec3 R = reflect(-l, n);\n"
  94                         "float cos_alpha = clamp(dot(E, R), 0, 1);\n"
  95                         "color = ambient"
  96                                 " + frag_color * light_color * light_power * cos_theta / (distance * distance)"
  97                                 " + specular * light_color * light_power * pow(cos_alpha, 5) / (distance * distance);\n"
  98                 "}\n"
  99         );
 100         program.Link();
 101         if (!program.Linked()) {
 102                 program.Log(std::cerr);
 103                 throw std::runtime_error("link program");
 104         }
 105
 106         GLuint VertexArrayID;
 107         glGenVertexArrays(1, &VertexArrayID);
 108         glBindVertexArray(VertexArrayID);
 109
 110         cam.Position(glm::vec3(0, 4, 4));
 111
 112         blockType.Add(BlockType(true, glm::vec3(1, 1, 1)));
 113         blockType.Add(BlockType(true, glm::vec3(1, 0, 0)));
 114         blockType.Add(BlockType(true, glm::vec3(0, 1, 0)));
 115         blockType.Add(BlockType(true, glm::vec3(0, 0, 1)));
 116
 117         chunk.BlockAt(glm::vec3(0, 0, 0)) = Block(blockType[4]);
 118         chunk.BlockAt(glm::vec3(0, 0, 1)) = Block(blockType[1]);
 119         chunk.BlockAt(glm::vec3(1, 0, 0)) = Block(blockType[2]);
 120         chunk.BlockAt(glm::vec3(1, 0, 1)) = Block(blockType[3]);
 121         chunk.BlockAt(glm::vec3(2, 0, 0)) = Block(blockType[4]);
 122         chunk.BlockAt(glm::vec3(2, 0, 1)) = Block(blockType[1]);
 123         chunk.BlockAt(glm::vec3(3, 0, 0)) = Block(blockType[2]);
 124         chunk.BlockAt(glm::vec3(3, 0, 1)) = Block(blockType[3]);
 125         chunk.BlockAt(glm::vec3(2, 0, 2)) = Block(blockType[4]);
 126         chunk.BlockAt(glm::vec3(2, 0, 3)) = Block(blockType[1]);
 127         chunk.BlockAt(glm::vec3(3, 0, 2)) = Block(blockType[2]);
 128         chunk.BlockAt(glm::vec3(3, 0, 3)) = Block(blockType[3]);
 129         chunk.BlockAt(glm::vec3(1, 1, 0)) = Block(blockType[1]);
 130         chunk.BlockAt(glm::vec3(1, 1, 1)) = Block(blockType[4]);
 131         chunk.BlockAt(glm::vec3(2, 1, 1)) = Block(blockType[3]);
 132         chunk.BlockAt(glm::vec3(2, 2, 1)) = Block(blockType[2]);
 133         chunk.Invalidate();
 134
 135         m_handle = program.UniformLocation("M");
 136         v_handle = program.UniformLocation("V");
 137         mv_handle = program.UniformLocation("MV");
 138         mvp_handle = program.UniformLocation("MVP");
 139         light_position_handle = program.UniformLocation("light_position");
 140         light_color_handle = program.UniformLocation("light_color");
 141         light_power_handle = program.UniformLocation("light_power");
 142
 143         glClearColor(0.0, 0.0, 0.0, 1.0);
 144 }
 145
 146 Application::~Application() {
 147
 148 }
 149
 150
 151 void Application::Run() {
 152         running = true;
 153         Uint32 last = SDL_GetTicks();
 154         window.GrabMouse();
 155         while (running) {
 156                 Uint32 now = SDL_GetTicks();
 157                 int delta = now - last;
 158                 Loop(delta);
 159                 last = now;
 160         }
 161 }
 162
 163 void Application::Loop(int dt) {
 164         HandleEvents();
 165         Update(dt);
 166         Render();
 167 }
 168
 169
 170 void Application::HandleEvents() {
 171         SDL_Event event;
 172         while (SDL_PollEvent(&event)) {
 173                 switch (event.type) {
 174                         case SDL_KEYDOWN:
 175                         case SDL_KEYUP:
 176                                 switch (event.key.keysym.sym) {
 177                                         case SDLK_w:
 178                                                 front = event.key.state == SDL_PRESSED;
 179                                                 break;
 180                                         case SDLK_s:
 181                                                 back = event.key.state == SDL_PRESSED;
 182                                                 break;
 183                                         case SDLK_a:
 184                                                 left = event.key.state == SDL_PRESSED;
 185                                                 break;
 186                                         case SDLK_d:
 187                                                 right = event.key.state == SDL_PRESSED;
 188                                                 break;
 189                                         case SDLK_q:
 190                                                 up = event.key.state == SDL_PRESSED;
 191                                                 break;
 192                                         case SDLK_e:
 193                                                 down = event.key.state == SDL_PRESSED;
 194                                                 break;
 195                                 }
 196                                 break;
 197                         case SDL_MOUSEMOTION:
 198                                 cam.RotateYaw(event.motion.xrel * yaw_sensitivity);
 199                                 cam.RotatePitch(event.motion.yrel * pitch_sensitivity);
 200                                 break;
 201                         case SDL_QUIT:
 202                                 running = false;
 203                                 break;
 204                         case SDL_WINDOWEVENT:
 205                                 switch (event.window.event) {
 206                                         case SDL_WINDOWEVENT_RESIZED:
 207                                                 cam.Viewport(event.window.data1, event.window.data2);
 208                                                 break;
 209                                         default:
 210                                                 break;
 211                                 }
 212                                 break;
 213                         default:
 214                                 break;
 215                 }
 216         }
 217 }
 218
 219 void Application::Update(int dt) {
 220         glm::vec3 vel;
 221         if (right && !left) {
 222                 vel.x = move_velocity;
 223         } else if (left && !right) {
 224                 vel.x = -move_velocity;
 225         }
 226         if (up && !down) {
 227                 vel.y = move_velocity;
 228         } else if (down && !up) {
 229                 vel.y = -move_velocity;
 230         }
 231         if (back && !front) {
 232                 vel.z = move_velocity;
 233         } else if (front && !back) {
 234                 vel.z = -move_velocity;
 235         }
 236         cam.OrientationVelocity(vel);
 237
 238         cam.Update(dt);
 239
 240         Ray aim = cam.Aim();
 241         int blkid;
 242         float dist;
 243         if (chunk.Intersection(aim, glm::mat4(1.0f), &blkid, &dist)) {
 244                 glm::vec3 pos = Chunk::ToCoords(blkid);
 245                 std::cout << "pointing at: <" << pos.x << ", " << pos.y << ", " << pos.z << ">, "
 246                         "distance: " << dist << std::endl;
 247         } else {
 248                 std::cout << "pointing at: nothing" << std::endl;
 249         }
 250 }
 251
 252 void Application::Render() {
 253         GLContext::Clear();
 254
 255         program.Use();
 256
 257         glm::mat4 m(1.0f);
 258         glm::mat4 mv(cam.View() * m);
 259         glm::mat4 mvp(cam.MakeMVP(m));
 260         glUniformMatrix4fv(m_handle, 1, GL_FALSE, &m[0][0]);
 261         glUniformMatrix4fv(v_handle, 1, GL_FALSE, &cam.View()[0][0]);
 262         glUniformMatrix4fv(mv_handle, 1, GL_FALSE, &mv[0][0]);
 263         glUniformMatrix4fv(mvp_handle, 1, GL_FALSE, &mvp[0][0]);
 264         glUniform3f(light_position_handle, light_position.x, light_position.y, light_position.z);
 265         glUniform3f(light_color_handle, light_color.x, light_color.y, light_color.z);
 266         glUniform1f(light_power_handle, light_power);
 267
 268         chunk.Draw();
 269
 270         window.Flip();
 271 }
 272
 273 }