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 , cam()
  23 , world()
  24 , outline()
  25 , outline_visible(false)
  26 , outline_transform(1.0f)
  27 , light_position(17.0f, 17.0f, 17.0f)
  28 , light_color(1.0f, 1.0f, 1.0f)
  29 , light_power(250.0f)
  30 , m_handle(0)
  31 , v_handle(0)
  32 , mv_handle(0)
  33 , mvp_handle(0)
  34 , light_position_handle(0)
  35 , light_color_handle(0)
  36 , light_power_handle(0)
  37 , running(false)
  38 , front(false)
  39 , back(false)
  40 , left(false)
  41 , right(false)
  42 , up(false)
  43 , down(false)
  44 , place(false)
  45 , remove(false)
  46 , pick(false)
  47 , remove_id(0)
  48 , place_id(1) {
  49         GLContext::EnableVSync();
  50         GLContext::EnableDepthTest();
  51         GLContext::EnableBackfaceCulling();
  52         program.LoadShader(
  53                 GL_VERTEX_SHADER,
  54                 "#version 330 core\n"
  55                 "layout(location = 0) in vec3 vtx_position;\n"
  56                 "layout(location = 1) in vec3 vtx_color;\n"
  57                 "layout(location = 2) in vec3 vtx_normal;\n"
  58                 "uniform mat4 M;\n"
  59                 "uniform mat4 V;\n"
  60                 "uniform mat4 MV;\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 = (MV * 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 = (MV * 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         world.Generate();
 121
 122         outline.vertices = std::vector<glm::vec3>({
 123                 { 0.0f, 0.0f, 0.0f }, { 1.0f, 0.0f, 0.0f },
 124                 { 1.0f, 0.0f, 0.0f }, { 1.0f, 1.0f, 0.0f },
 125                 { 1.0f, 1.0f, 0.0f }, { 0.0f, 1.0f, 0.0f },
 126                 { 0.0f, 1.0f, 0.0f }, { 0.0f, 0.0f, 0.0f },
 127                 { 0.0f, 0.0f, 0.0f }, { 0.0f, 0.0f, 1.0f },
 128                 { 1.0f, 0.0f, 0.0f }, { 1.0f, 0.0f, 1.0f },
 129                 { 1.0f, 1.0f, 0.0f }, { 1.0f, 1.0f, 1.0f },
 130                 { 0.0f, 1.0f, 0.0f }, { 0.0f, 1.0f, 1.0f },
 131                 { 0.0f, 0.0f, 1.0f }, { 1.0f, 0.0f, 1.0f },
 132                 { 1.0f, 0.0f, 1.0f }, { 1.0f, 1.0f, 1.0f },
 133                 { 1.0f, 1.0f, 1.0f }, { 0.0f, 1.0f, 1.0f },
 134                 { 0.0f, 1.0f, 1.0f }, { 0.0f, 0.0f, 1.0f },
 135         });
 136         outline.colors.resize(24, { -1, -1, -1 });
 137         outline.Invalidate();
 138
 139         m_handle = program.UniformLocation("M");
 140         v_handle = program.UniformLocation("V");
 141         mv_handle = program.UniformLocation("MV");
 142         mvp_handle = program.UniformLocation("MVP");
 143         light_position_handle = program.UniformLocation("light_position");
 144         light_color_handle = program.UniformLocation("light_color");
 145         light_power_handle = program.UniformLocation("light_power");
 146
 147         glClearColor(0.0, 0.0, 0.0, 1.0);
 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_MOUSEBUTTONDOWN:
 198                                 if (event.button.button == 1) {
 199                                         // left
 200                                         remove = true;
 201                                 } else if (event.button.button == 2) {
 202                                         // middle
 203                                         pick = true;
 204                                 } else if (event.button.button == 3) {
 205                                         // right
 206                                         place = true;
 207                                 }
 208                                 break;
 209                         case SDL_MOUSEMOTION:
 210                                 cam.RotateYaw(event.motion.xrel * yaw_sensitivity);
 211                                 cam.RotatePitch(event.motion.yrel * pitch_sensitivity);
 212                                 break;
 213                         case SDL_QUIT:
 214                                 running = false;
 215                                 break;
 216                         case SDL_WINDOWEVENT:
 217                                 switch (event.window.event) {
 218                                         case SDL_WINDOWEVENT_RESIZED:
 219                                                 cam.Viewport(event.window.data1, event.window.data2);
 220                                                 break;
 221                                         default:
 222                                                 break;
 223                                 }
 224                                 break;
 225                         default:
 226                                 break;
 227                 }
 228         }
 229 }
 230
 231 void Application::Update(int dt) {
 232         glm::vec3 vel;
 233         if (right && !left) {
 234                 vel.x = move_velocity;
 235         } else if (left && !right) {
 236                 vel.x = -move_velocity;
 237         }
 238         if (up && !down) {
 239                 vel.y = move_velocity;
 240         } else if (down && !up) {
 241                 vel.y = -move_velocity;
 242         }
 243         if (back && !front) {
 244                 vel.z = move_velocity;
 245         } else if (front && !back) {
 246                 vel.z = -move_velocity;
 247         }
 248         cam.OrientationVelocity(vel);
 249
 250         cam.Update(dt);
 251
 252         Ray aim = cam.Aim();
 253         Chunk *chunk;
 254         int blkid;
 255         float dist;
 256         glm::vec3 normal;
 257         if (world.Intersection(aim, glm::mat4(1.0f), &chunk, &blkid, &dist, &normal)) {
 258                 glm::vec3 pos = Chunk::ToCoords(blkid);
 259                 outline_visible = true;
 260                 outline_transform = glm::translate(chunk->Transform(), pos);
 261         } else {
 262                 outline_visible = false;
 263         }
 264
 265         if (pick) {
 266                 if (chunk) {
 267                         place_id = chunk->BlockAt(blkid).type->id;
 268                 }
 269                 pick = false;
 270         }
 271         if (remove) {
 272                 if (chunk) {
 273                         chunk->BlockAt(blkid).type = world.BlockTypes()[remove_id];
 274                         chunk->Invalidate();
 275                 }
 276                 remove = false;
 277         }
 278         if (place) {
 279                 if (chunk) {
 280                         Chunk *mod_chunk = chunk;
 281                         glm::vec3 next_pos = Chunk::ToCoords(blkid) + normal;
 282                         if (!Chunk::InBounds(next_pos)) {
 283                                 mod_chunk = &world.Next(*chunk, normal);
 284                                 next_pos -= normal * Chunk::Extent();
 285                         }
 286                         mod_chunk->BlockAt(next_pos).type = world.BlockTypes()[place_id];
 287                         mod_chunk->Invalidate();
 288                 }
 289                 place = false;
 290         }
 291 }
 292
 293 void Application::Render() {
 294         GLContext::Clear();
 295
 296         program.Use();
 297
 298         glUniformMatrix4fv(v_handle, 1, GL_FALSE, &cam.View()[0][0]);
 299         glUniform3f(light_position_handle, light_position.x, light_position.y, light_position.z);
 300         glUniform3f(light_color_handle, light_color.x, light_color.y, light_color.z);
 301         glUniform1f(light_power_handle, light_power);
 302
 303         for (Chunk &chunk : world.LoadedChunks()) {
 304                 glm::mat4 m(chunk.Transform());
 305                 glm::mat4 mv(cam.View() * m);
 306                 glm::mat4 mvp(cam.MakeMVP(m));
 307                 glUniformMatrix4fv(m_handle, 1, GL_FALSE, &m[0][0]);
 308                 glUniformMatrix4fv(mv_handle, 1, GL_FALSE, &mv[0][0]);
 309                 glUniformMatrix4fv(mvp_handle, 1, GL_FALSE, &mvp[0][0]);
 310                 chunk.Draw();
 311         }
 312
 313         if (outline_visible) {
 314                 glm::mat4 m(outline_transform);
 315                 glm::mat4 mv(cam.View() * outline_transform);
 316                 glm::mat4 mvp(cam.MakeMVP(outline_transform));
 317                 glUniformMatrix4fv(m_handle, 1, GL_FALSE, &m[0][0]);
 318                 glUniformMatrix4fv(mv_handle, 1, GL_FALSE, &mv[0][0]);
 319                 glUniformMatrix4fv(mvp_handle, 1, GL_FALSE, &mvp[0][0]);
 320                 outline.Draw();
 321         }
 322
 323         window.Flip();
 324 }
 325
 326 }