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 , place(false)
  46 , remove(false)
  47 , pick(false)
  48 , remove_id(0)
  49 , place_id(1) {
  50         GLContext::EnableVSync();
  51         GLContext::EnableDepthTest();
  52         GLContext::EnableBackfaceCulling();
  53         program.LoadShader(
  54                 GL_VERTEX_SHADER,
  55                 "#version 330 core\n"
  56                 "layout(location = 0) in vec3 vtx_position;\n"
  57                 "layout(location = 1) in vec3 vtx_color;\n"
  58                 "layout(location = 2) in vec3 vtx_normal;\n"
  59                 "uniform mat4 M;\n"
  60                 "uniform mat4 V;\n"
  61                 "uniform mat4 MVP;\n"
  62                 "uniform vec3 light_position;\n"
  63                 "out vec3 frag_color;\n"
  64                 "out vec3 vtx_world;\n"
  65                 "out vec3 normal;\n"
  66                 "out vec3 eye;\n"
  67                 "out vec3 light_direction;\n"
  68                 "void main() {\n"
  69                         "vec4 v = vec4(vtx_position, 1);\n"
  70                         "gl_Position = MVP * v;\n"
  71                         "vtx_world = (M * v).xyz;\n"
  72                         "vec3 vtx_camera = (V * M * v).xyz;\n"
  73                         "eye = vec3(0, 0, 0) - vtx_camera;\n"
  74                         "vec3 light_camera = (V * v).xyz;\n"
  75                         "light_direction = light_position + eye;\n"
  76                         "normal = (V * M * vec4(vtx_normal, 0)).xyz;\n"
  77                         "frag_color = vtx_color;\n"
  78                 "}\n"
  79         );
  80         program.LoadShader(
  81                 GL_FRAGMENT_SHADER,
  82                 "#version 330 core\n"
  83                 "in vec3 frag_color;\n"
  84                 "in vec3 vtx_world;\n"
  85                 "in vec3 normal;\n"
  86                 "in vec3 eye;\n"
  87                 "in vec3 light_direction;\n"
  88                 "uniform mat4 MV;\n"
  89                 "uniform vec3 light_position;\n"
  90                 "uniform vec3 light_color;\n"
  91                 "uniform float light_power;\n"
  92                 "out vec3 color;\n"
  93                 "void main() {\n"
  94                         "vec3 ambient = vec3(0.1, 0.1, 0.1) * frag_color;\n"
  95                         "vec3 specular = vec3(0.3, 0.3, 0.3);\n"
  96                         "float distance = length(light_position - vtx_world);\n"
  97                         "vec3 n = normalize(normal);\n"
  98                         "vec3 l = normalize(light_direction);\n"
  99                         "float cos_theta = clamp(dot(n, l), 0, 1);\n"
 100                         "vec3 E = normalize(eye);\n"
 101                         "vec3 R = reflect(-l, n);\n"
 102                         "float cos_alpha = clamp(dot(E, R), 0, 1);\n"
 103                         "color = ambient"
 104                                 " + frag_color * light_color * light_power * cos_theta / (distance * distance)"
 105                                 " + specular * light_color * light_power * pow(cos_alpha, 5) / (distance * distance);\n"
 106                 "}\n"
 107         );
 108         program.Link();
 109         if (!program.Linked()) {
 110                 program.Log(std::cerr);
 111                 throw std::runtime_error("link program");
 112         }
 113
 114         GLuint VertexArrayID;
 115         glGenVertexArrays(1, &VertexArrayID);
 116         glBindVertexArray(VertexArrayID);
 117
 118         cam.Position(glm::vec3(0, 4, 4));
 119
 120         blockType.Add(BlockType(true, glm::vec3(1, 1, 1)));
 121         blockType.Add(BlockType(true, glm::vec3(1, 0, 0)));
 122         blockType.Add(BlockType(true, glm::vec3(0, 1, 0)));
 123         blockType.Add(BlockType(true, glm::vec3(0, 0, 1)));
 124
 125         chunk.BlockAt(glm::vec3(0, 0, 0)) = Block(blockType[4]);
 126         chunk.BlockAt(glm::vec3(0, 0, 1)) = Block(blockType[1]);
 127         chunk.BlockAt(glm::vec3(1, 0, 0)) = Block(blockType[2]);
 128         chunk.BlockAt(glm::vec3(1, 0, 1)) = Block(blockType[3]);
 129         chunk.BlockAt(glm::vec3(2, 0, 0)) = Block(blockType[4]);
 130         chunk.BlockAt(glm::vec3(2, 0, 1)) = Block(blockType[1]);
 131         chunk.BlockAt(glm::vec3(3, 0, 0)) = Block(blockType[2]);
 132         chunk.BlockAt(glm::vec3(3, 0, 1)) = Block(blockType[3]);
 133         chunk.BlockAt(glm::vec3(2, 0, 2)) = Block(blockType[4]);
 134         chunk.BlockAt(glm::vec3(2, 0, 3)) = Block(blockType[1]);
 135         chunk.BlockAt(glm::vec3(3, 0, 2)) = Block(blockType[2]);
 136         chunk.BlockAt(glm::vec3(3, 0, 3)) = Block(blockType[3]);
 137         chunk.BlockAt(glm::vec3(1, 1, 0)) = Block(blockType[1]);
 138         chunk.BlockAt(glm::vec3(1, 1, 1)) = Block(blockType[4]);
 139         chunk.BlockAt(glm::vec3(2, 1, 1)) = Block(blockType[3]);
 140         chunk.BlockAt(glm::vec3(2, 2, 1)) = Block(blockType[2]);
 141         chunk.Invalidate();
 142
 143         outline.vertices = std::vector<glm::vec3>({
 144                 { 0.0f, 0.0f, 0.0f }, { 1.0f, 0.0f, 0.0f },
 145                 { 1.0f, 0.0f, 0.0f }, { 1.0f, 1.0f, 0.0f },
 146                 { 1.0f, 1.0f, 0.0f }, { 0.0f, 1.0f, 0.0f },
 147                 { 0.0f, 1.0f, 0.0f }, { 0.0f, 0.0f, 0.0f },
 148                 { 0.0f, 0.0f, 0.0f }, { 0.0f, 0.0f, 1.0f },
 149                 { 1.0f, 0.0f, 0.0f }, { 1.0f, 0.0f, 1.0f },
 150                 { 1.0f, 1.0f, 0.0f }, { 1.0f, 1.0f, 1.0f },
 151                 { 0.0f, 1.0f, 0.0f }, { 0.0f, 1.0f, 1.0f },
 152                 { 0.0f, 0.0f, 1.0f }, { 1.0f, 0.0f, 1.0f },
 153                 { 1.0f, 0.0f, 1.0f }, { 1.0f, 1.0f, 1.0f },
 154                 { 1.0f, 1.0f, 1.0f }, { 0.0f, 1.0f, 1.0f },
 155                 { 0.0f, 1.0f, 1.0f }, { 0.0f, 0.0f, 1.0f },
 156         });
 157         outline.colors.resize(24, { -1, -1, -1 });
 158         outline.Invalidate();
 159
 160         m_handle = program.UniformLocation("M");
 161         v_handle = program.UniformLocation("V");
 162         mv_handle = program.UniformLocation("MV");
 163         mvp_handle = program.UniformLocation("MVP");
 164         light_position_handle = program.UniformLocation("light_position");
 165         light_color_handle = program.UniformLocation("light_color");
 166         light_power_handle = program.UniformLocation("light_power");
 167
 168         glClearColor(0.0, 0.0, 0.0, 1.0);
 169 }
 170
 171
 172 void Application::Run() {
 173         running = true;
 174         Uint32 last = SDL_GetTicks();
 175         window.GrabMouse();
 176         while (running) {
 177                 Uint32 now = SDL_GetTicks();
 178                 int delta = now - last;
 179                 Loop(delta);
 180                 last = now;
 181         }
 182 }
 183
 184 void Application::Loop(int dt) {
 185         HandleEvents();
 186         Update(dt);
 187         Render();
 188 }
 189
 190
 191 void Application::HandleEvents() {
 192         SDL_Event event;
 193         while (SDL_PollEvent(&event)) {
 194                 switch (event.type) {
 195                         case SDL_KEYDOWN:
 196                         case SDL_KEYUP:
 197                                 switch (event.key.keysym.sym) {
 198                                         case SDLK_w:
 199                                                 front = event.key.state == SDL_PRESSED;
 200                                                 break;
 201                                         case SDLK_s:
 202                                                 back = event.key.state == SDL_PRESSED;
 203                                                 break;
 204                                         case SDLK_a:
 205                                                 left = event.key.state == SDL_PRESSED;
 206                                                 break;
 207                                         case SDLK_d:
 208                                                 right = event.key.state == SDL_PRESSED;
 209                                                 break;
 210                                         case SDLK_q:
 211                                                 up = event.key.state == SDL_PRESSED;
 212                                                 break;
 213                                         case SDLK_e:
 214                                                 down = event.key.state == SDL_PRESSED;
 215                                                 break;
 216                                 }
 217                                 break;
 218                         case SDL_MOUSEBUTTONDOWN:
 219                                 if (event.button.button == 1) {
 220                                         // left
 221                                         remove = true;
 222                                 } else if (event.button.button == 2) {
 223                                         // middle
 224                                         pick = true;
 225                                 } else if (event.button.button == 3) {
 226                                         // right
 227                                         place = true;
 228                                 }
 229                                 break;
 230                         case SDL_MOUSEMOTION:
 231                                 cam.RotateYaw(event.motion.xrel * yaw_sensitivity);
 232                                 cam.RotatePitch(event.motion.yrel * pitch_sensitivity);
 233                                 break;
 234                         case SDL_QUIT:
 235                                 running = false;
 236                                 break;
 237                         case SDL_WINDOWEVENT:
 238                                 switch (event.window.event) {
 239                                         case SDL_WINDOWEVENT_RESIZED:
 240                                                 cam.Viewport(event.window.data1, event.window.data2);
 241                                                 break;
 242                                         default:
 243                                                 break;
 244                                 }
 245                                 break;
 246                         default:
 247                                 break;
 248                 }
 249         }
 250 }
 251
 252 void Application::Update(int dt) {
 253         glm::vec3 vel;
 254         if (right && !left) {
 255                 vel.x = move_velocity;
 256         } else if (left && !right) {
 257                 vel.x = -move_velocity;
 258         }
 259         if (up && !down) {
 260                 vel.y = move_velocity;
 261         } else if (down && !up) {
 262                 vel.y = -move_velocity;
 263         }
 264         if (back && !front) {
 265                 vel.z = move_velocity;
 266         } else if (front && !back) {
 267                 vel.z = -move_velocity;
 268         }
 269         cam.OrientationVelocity(vel);
 270
 271         cam.Update(dt);
 272
 273         Ray aim = cam.Aim();
 274         int blkid;
 275         float dist;
 276         glm::vec3 normal;
 277         if (chunk.Intersection(aim, glm::mat4(1.0f), &blkid, &dist, &normal)) {
 278                 glm::vec3 pos = Chunk::ToCoords(blkid);
 279                 outline_visible = true;
 280                 outline_transform = glm::translate(glm::mat4(1.0f), pos);
 281         } else {
 282                 outline_visible = false;
 283         }
 284
 285         if (pick) {
 286                 if (outline_visible) {
 287                         place_id = chunk.BlockAt(blkid).type->id;
 288                 }
 289                 pick = false;
 290         }
 291         if (remove) {
 292                 chunk.BlockAt(blkid).type = blockType[remove_id];
 293                 chunk.Invalidate();
 294                 remove = false;
 295         }
 296         if (place) {
 297                 if (outline_visible) {
 298                         int next_blkid = Chunk::ToIndex(Chunk::ToCoords(blkid) + normal);
 299                         if (next_blkid >= 0 && next_blkid < Chunk::Size()) {
 300                                 chunk.BlockAt(next_blkid).type = blockType[place_id];
 301                                 chunk.Invalidate();
 302                         }
 303                 }
 304                 place = false;
 305         }
 306 }
 307
 308 void Application::Render() {
 309         GLContext::Clear();
 310
 311         program.Use();
 312
 313         glm::mat4 m(1.0f);
 314         glm::mat4 mv(cam.View() * m);
 315         glm::mat4 mvp(cam.MakeMVP(m));
 316         glUniformMatrix4fv(m_handle, 1, GL_FALSE, &m[0][0]);
 317         glUniformMatrix4fv(v_handle, 1, GL_FALSE, &cam.View()[0][0]);
 318         glUniformMatrix4fv(mv_handle, 1, GL_FALSE, &mv[0][0]);
 319         glUniformMatrix4fv(mvp_handle, 1, GL_FALSE, &mvp[0][0]);
 320         glUniform3f(light_position_handle, light_position.x, light_position.y, light_position.z);
 321         glUniform3f(light_color_handle, light_color.x, light_color.y, light_color.z);
 322         glUniform1f(light_power_handle, light_power);
 323
 324         chunk.Draw();
 325         if (outline_visible) {
 326                 mv = cam.View() * outline_transform;
 327                 mvp = cam.MakeMVP(outline_transform);
 328                 glUniformMatrix4fv(m_handle, 1, GL_FALSE, &m[0][0]);
 329                 glUniformMatrix4fv(mv_handle, 1, GL_FALSE, &mv[0][0]);
 330                 glUniformMatrix4fv(mvp_handle, 1, GL_FALSE, &mvp[0][0]);
 331                 outline.Draw();
 332         }
 333
 334         window.Flip();
 335 }
 336
 337 }