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 , outline()
  26 , outline_visible(false)
  27 , outline_transform(1.0f)
  28 , light_position(17.0f, 17.0f, 17.0f)
  29 , light_color(1.0f, 1.0f, 1.0f)
  30 , light_power(250.0f)
  31 , m_handle(0)
  32 , v_handle(0)
  33 , mv_handle(0)
  34 , mvp_handle(0)
  35 , light_position_handle(0)
  36 , light_color_handle(0)
  37 , light_power_handle(0)
  38 , running(false)
  39 , front(false)
  40 , back(false)
  41 , left(false)
  42 , right(false)
  43 , up(false)
  44 , down(false) {
  45         GLContext::EnableVSync();
  46         GLContext::EnableDepthTest();
  47         GLContext::EnableBackfaceCulling();
  48         program.LoadShader(
  49                 GL_VERTEX_SHADER,
  50                 "#version 330 core\n"
  51                 "layout(location = 0) in vec3 vtx_position;\n"
  52                 "layout(location = 1) in vec3 vtx_color;\n"
  53                 "layout(location = 2) in vec3 vtx_normal;\n"
  54                 "uniform mat4 M;\n"
  55                 "uniform mat4 V;\n"
  56                 "uniform mat4 MVP;\n"
  57                 "uniform vec3 light_position;\n"
  58                 "out vec3 frag_color;\n"
  59                 "out vec3 vtx_world;\n"
  60                 "out vec3 normal;\n"
  61                 "out vec3 eye;\n"
  62                 "out vec3 light_direction;\n"
  63                 "void main() {\n"
  64                         "vec4 v = vec4(vtx_position, 1);\n"
  65                         "gl_Position = MVP * v;\n"
  66                         "vtx_world = (M * v).xyz;\n"
  67                         "vec3 vtx_camera = (V * M * v).xyz;\n"
  68                         "eye = vec3(0, 0, 0) - vtx_camera;\n"
  69                         "vec3 light_camera = (V * v).xyz;\n"
  70                         "light_direction = light_position + eye;\n"
  71                         "normal = (V * M * vec4(vtx_normal, 0)).xyz;\n"
  72                         "frag_color = vtx_color;\n"
  73                 "}\n"
  74         );
  75         program.LoadShader(
  76                 GL_FRAGMENT_SHADER,
  77                 "#version 330 core\n"
  78                 "in vec3 frag_color;\n"
  79                 "in vec3 vtx_world;\n"
  80                 "in vec3 normal;\n"
  81                 "in vec3 eye;\n"
  82                 "in vec3 light_direction;\n"
  83                 "uniform mat4 MV;\n"
  84                 "uniform vec3 light_position;\n"
  85                 "uniform vec3 light_color;\n"
  86                 "uniform float light_power;\n"
  87                 "out vec3 color;\n"
  88                 "void main() {\n"
  89                         "vec3 ambient = vec3(0.1, 0.1, 0.1) * frag_color;\n"
  90                         "vec3 specular = vec3(0.3, 0.3, 0.3);\n"
  91                         "float distance = length(light_position - vtx_world);\n"
  92                         "vec3 n = normalize(normal);\n"
  93                         "vec3 l = normalize(light_direction);\n"
  94                         "float cos_theta = clamp(dot(n, l), 0, 1);\n"
  95                         "vec3 E = normalize(eye);\n"
  96                         "vec3 R = reflect(-l, n);\n"
  97                         "float cos_alpha = clamp(dot(E, R), 0, 1);\n"
  98                         "color = ambient"
  99                                 " + frag_color * light_color * light_power * cos_theta / (distance * distance)"
 100                                 " + specular * light_color * light_power * pow(cos_alpha, 5) / (distance * distance);\n"
 101                 "}\n"
 102         );
 103         program.Link();
 104         if (!program.Linked()) {
 105                 program.Log(std::cerr);
 106                 throw std::runtime_error("link program");
 107         }
 108
 109         GLuint VertexArrayID;
 110         glGenVertexArrays(1, &VertexArrayID);
 111         glBindVertexArray(VertexArrayID);
 112
 113         cam.Position(glm::vec3(0, 4, 4));
 114
 115         blockType.Add(BlockType(true, glm::vec3(1, 1, 1)));
 116         blockType.Add(BlockType(true, glm::vec3(1, 0, 0)));
 117         blockType.Add(BlockType(true, glm::vec3(0, 1, 0)));
 118         blockType.Add(BlockType(true, glm::vec3(0, 0, 1)));
 119
 120         chunk.BlockAt(glm::vec3(0, 0, 0)) = Block(blockType[4]);
 121         chunk.BlockAt(glm::vec3(0, 0, 1)) = Block(blockType[1]);
 122         chunk.BlockAt(glm::vec3(1, 0, 0)) = Block(blockType[2]);
 123         chunk.BlockAt(glm::vec3(1, 0, 1)) = Block(blockType[3]);
 124         chunk.BlockAt(glm::vec3(2, 0, 0)) = Block(blockType[4]);
 125         chunk.BlockAt(glm::vec3(2, 0, 1)) = Block(blockType[1]);
 126         chunk.BlockAt(glm::vec3(3, 0, 0)) = Block(blockType[2]);
 127         chunk.BlockAt(glm::vec3(3, 0, 1)) = Block(blockType[3]);
 128         chunk.BlockAt(glm::vec3(2, 0, 2)) = Block(blockType[4]);
 129         chunk.BlockAt(glm::vec3(2, 0, 3)) = Block(blockType[1]);
 130         chunk.BlockAt(glm::vec3(3, 0, 2)) = Block(blockType[2]);
 131         chunk.BlockAt(glm::vec3(3, 0, 3)) = Block(blockType[3]);
 132         chunk.BlockAt(glm::vec3(1, 1, 0)) = Block(blockType[1]);
 133         chunk.BlockAt(glm::vec3(1, 1, 1)) = Block(blockType[4]);
 134         chunk.BlockAt(glm::vec3(2, 1, 1)) = Block(blockType[3]);
 135         chunk.BlockAt(glm::vec3(2, 2, 1)) = Block(blockType[2]);
 136         chunk.Invalidate();
 137
 138         outline.vertices = std::vector<glm::vec3>({
 139                 { 0.0f, 0.0f, 0.0f }, { 1.0f, 0.0f, 0.0f },
 140                 { 1.0f, 0.0f, 0.0f }, { 1.0f, 1.0f, 0.0f },
 141                 { 1.0f, 1.0f, 0.0f }, { 0.0f, 1.0f, 0.0f },
 142                 { 0.0f, 1.0f, 0.0f }, { 0.0f, 0.0f, 0.0f },
 143                 { 0.0f, 0.0f, 0.0f }, { 0.0f, 0.0f, 1.0f },
 144                 { 1.0f, 0.0f, 0.0f }, { 1.0f, 0.0f, 1.0f },
 145                 { 1.0f, 1.0f, 0.0f }, { 1.0f, 1.0f, 1.0f },
 146                 { 0.0f, 1.0f, 0.0f }, { 0.0f, 1.0f, 1.0f },
 147                 { 0.0f, 0.0f, 1.0f }, { 1.0f, 0.0f, 1.0f },
 148                 { 1.0f, 0.0f, 1.0f }, { 1.0f, 1.0f, 1.0f },
 149                 { 1.0f, 1.0f, 1.0f }, { 0.0f, 1.0f, 1.0f },
 150                 { 0.0f, 1.0f, 1.0f }, { 0.0f, 0.0f, 1.0f },
 151         });
 152         outline.colors.resize(24, { -1, -1, -1 });
 153         outline.Invalidate();
 154
 155         m_handle = program.UniformLocation("M");
 156         v_handle = program.UniformLocation("V");
 157         mv_handle = program.UniformLocation("MV");
 158         mvp_handle = program.UniformLocation("MVP");
 159         light_position_handle = program.UniformLocation("light_position");
 160         light_color_handle = program.UniformLocation("light_color");
 161         light_power_handle = program.UniformLocation("light_power");
 162
 163         glClearColor(0.0, 0.0, 0.0, 1.0);
 164 }
 165
 166 Application::~Application() {
 167
 168 }
 169
 170
 171 void Application::Run() {
 172         running = true;
 173         Uint32 last = SDL_GetTicks();
 174         window.GrabMouse();
 175         while (running) {
 176                 Uint32 now = SDL_GetTicks();
 177                 int delta = now - last;
 178                 Loop(delta);
 179                 last = now;
 180         }
 181 }
 182
 183 void Application::Loop(int dt) {
 184         HandleEvents();
 185         Update(dt);
 186         Render();
 187 }
 188
 189
 190 void Application::HandleEvents() {
 191         SDL_Event event;
 192         while (SDL_PollEvent(&event)) {
 193                 switch (event.type) {
 194                         case SDL_KEYDOWN:
 195                         case SDL_KEYUP:
 196                                 switch (event.key.keysym.sym) {
 197                                         case SDLK_w:
 198                                                 front = event.key.state == SDL_PRESSED;
 199                                                 break;
 200                                         case SDLK_s:
 201                                                 back = event.key.state == SDL_PRESSED;
 202                                                 break;
 203                                         case SDLK_a:
 204                                                 left = event.key.state == SDL_PRESSED;
 205                                                 break;
 206                                         case SDLK_d:
 207                                                 right = event.key.state == SDL_PRESSED;
 208                                                 break;
 209                                         case SDLK_q:
 210                                                 up = event.key.state == SDL_PRESSED;
 211                                                 break;
 212                                         case SDLK_e:
 213                                                 down = event.key.state == SDL_PRESSED;
 214                                                 break;
 215                                 }
 216                                 break;
 217                         case SDL_MOUSEMOTION:
 218                                 cam.RotateYaw(event.motion.xrel * yaw_sensitivity);
 219                                 cam.RotatePitch(event.motion.yrel * pitch_sensitivity);
 220                                 break;
 221                         case SDL_QUIT:
 222                                 running = false;
 223                                 break;
 224                         case SDL_WINDOWEVENT:
 225                                 switch (event.window.event) {
 226                                         case SDL_WINDOWEVENT_RESIZED:
 227                                                 cam.Viewport(event.window.data1, event.window.data2);
 228                                                 break;
 229                                         default:
 230                                                 break;
 231                                 }
 232                                 break;
 233                         default:
 234                                 break;
 235                 }
 236         }
 237 }
 238
 239 void Application::Update(int dt) {
 240         glm::vec3 vel;
 241         if (right && !left) {
 242                 vel.x = move_velocity;
 243         } else if (left && !right) {
 244                 vel.x = -move_velocity;
 245         }
 246         if (up && !down) {
 247                 vel.y = move_velocity;
 248         } else if (down && !up) {
 249                 vel.y = -move_velocity;
 250         }
 251         if (back && !front) {
 252                 vel.z = move_velocity;
 253         } else if (front && !back) {
 254                 vel.z = -move_velocity;
 255         }
 256         cam.OrientationVelocity(vel);
 257
 258         cam.Update(dt);
 259
 260         Ray aim = cam.Aim();
 261         int blkid;
 262         float dist;
 263         if (chunk.Intersection(aim, glm::mat4(1.0f), &blkid, &dist)) {
 264                 glm::vec3 pos = Chunk::ToCoords(blkid);
 265                 outline_visible = true;
 266                 outline_transform = glm::translate(glm::mat4(1.0f), pos);
 267         } else {
 268                 outline_visible = false;
 269         }
 270 }
 271
 272 void Application::Render() {
 273         GLContext::Clear();
 274
 275         program.Use();
 276
 277         glm::mat4 m(1.0f);
 278         glm::mat4 mv(cam.View() * m);
 279         glm::mat4 mvp(cam.MakeMVP(m));
 280         glUniformMatrix4fv(m_handle, 1, GL_FALSE, &m[0][0]);
 281         glUniformMatrix4fv(v_handle, 1, GL_FALSE, &cam.View()[0][0]);
 282         glUniformMatrix4fv(mv_handle, 1, GL_FALSE, &mv[0][0]);
 283         glUniformMatrix4fv(mvp_handle, 1, GL_FALSE, &mvp[0][0]);
 284         glUniform3f(light_position_handle, light_position.x, light_position.y, light_position.z);
 285         glUniform3f(light_color_handle, light_color.x, light_color.y, light_color.z);
 286         glUniform1f(light_power_handle, light_power);
 287
 288         chunk.Draw();
 289         if (outline_visible) {
 290                 mv = cam.View() * outline_transform;
 291                 mvp = cam.MakeMVP(outline_transform);
 292                 glUniformMatrix4fv(m_handle, 1, GL_FALSE, &m[0][0]);
 293                 glUniformMatrix4fv(mv_handle, 1, GL_FALSE, &mv[0][0]);
 294                 glUniformMatrix4fv(mvp_handle, 1, GL_FALSE, &mvp[0][0]);
 295                 outline.Draw();
 296         }
 297
 298         window.Flip();
 299 }
 300
 301 }