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
 167 void Application::Run() {
 168         running = true;
 169         Uint32 last = SDL_GetTicks();
 170         window.GrabMouse();
 171         while (running) {
 172                 Uint32 now = SDL_GetTicks();
 173                 int delta = now - last;
 174                 Loop(delta);
 175                 last = now;
 176         }
 177 }
 178
 179 void Application::Loop(int dt) {
 180         HandleEvents();
 181         Update(dt);
 182         Render();
 183 }
 184
 185
 186 void Application::HandleEvents() {
 187         SDL_Event event;
 188         while (SDL_PollEvent(&event)) {
 189                 switch (event.type) {
 190                         case SDL_KEYDOWN:
 191                         case SDL_KEYUP:
 192                                 switch (event.key.keysym.sym) {
 193                                         case SDLK_w:
 194                                                 front = event.key.state == SDL_PRESSED;
 195                                                 break;
 196                                         case SDLK_s:
 197                                                 back = event.key.state == SDL_PRESSED;
 198                                                 break;
 199                                         case SDLK_a:
 200                                                 left = event.key.state == SDL_PRESSED;
 201                                                 break;
 202                                         case SDLK_d:
 203                                                 right = event.key.state == SDL_PRESSED;
 204                                                 break;
 205                                         case SDLK_q:
 206                                                 up = event.key.state == SDL_PRESSED;
 207                                                 break;
 208                                         case SDLK_e:
 209                                                 down = event.key.state == SDL_PRESSED;
 210                                                 break;
 211                                 }
 212                                 break;
 213                         case SDL_MOUSEMOTION:
 214                                 cam.RotateYaw(event.motion.xrel * yaw_sensitivity);
 215                                 cam.RotatePitch(event.motion.yrel * pitch_sensitivity);
 216                                 break;
 217                         case SDL_QUIT:
 218                                 running = false;
 219                                 break;
 220                         case SDL_WINDOWEVENT:
 221                                 switch (event.window.event) {
 222                                         case SDL_WINDOWEVENT_RESIZED:
 223                                                 cam.Viewport(event.window.data1, event.window.data2);
 224                                                 break;
 225                                         default:
 226                                                 break;
 227                                 }
 228                                 break;
 229                         default:
 230                                 break;
 231                 }
 232         }
 233 }
 234
 235 void Application::Update(int dt) {
 236         glm::vec3 vel;
 237         if (right && !left) {
 238                 vel.x = move_velocity;
 239         } else if (left && !right) {
 240                 vel.x = -move_velocity;
 241         }
 242         if (up && !down) {
 243                 vel.y = move_velocity;
 244         } else if (down && !up) {
 245                 vel.y = -move_velocity;
 246         }
 247         if (back && !front) {
 248                 vel.z = move_velocity;
 249         } else if (front && !back) {
 250                 vel.z = -move_velocity;
 251         }
 252         cam.OrientationVelocity(vel);
 253
 254         cam.Update(dt);
 255
 256         Ray aim = cam.Aim();
 257         int blkid;
 258         float dist;
 259         if (chunk.Intersection(aim, glm::mat4(1.0f), &blkid, &dist)) {
 260                 glm::vec3 pos = Chunk::ToCoords(blkid);
 261                 outline_visible = true;
 262                 outline_transform = glm::translate(glm::mat4(1.0f), pos);
 263         } else {
 264                 outline_visible = false;
 265         }
 266 }
 267
 268 void Application::Render() {
 269         GLContext::Clear();
 270
 271         program.Use();
 272
 273         glm::mat4 m(1.0f);
 274         glm::mat4 mv(cam.View() * m);
 275         glm::mat4 mvp(cam.MakeMVP(m));
 276         glUniformMatrix4fv(m_handle, 1, GL_FALSE, &m[0][0]);
 277         glUniformMatrix4fv(v_handle, 1, GL_FALSE, &cam.View()[0][0]);
 278         glUniformMatrix4fv(mv_handle, 1, GL_FALSE, &mv[0][0]);
 279         glUniformMatrix4fv(mvp_handle, 1, GL_FALSE, &mvp[0][0]);
 280         glUniform3f(light_position_handle, light_position.x, light_position.y, light_position.z);
 281         glUniform3f(light_color_handle, light_color.x, light_color.y, light_color.z);
 282         glUniform1f(light_power_handle, light_power);
 283
 284         chunk.Draw();
 285         if (outline_visible) {
 286                 mv = cam.View() * outline_transform;
 287                 mvp = cam.MakeMVP(outline_transform);
 288                 glUniformMatrix4fv(m_handle, 1, GL_FALSE, &m[0][0]);
 289                 glUniformMatrix4fv(mv_handle, 1, GL_FALSE, &mv[0][0]);
 290                 glUniformMatrix4fv(mvp_handle, 1, GL_FALSE, &mvp[0][0]);
 291                 outline.Draw();
 292         }
 293
 294         window.Flip();
 295 }
 296
 297 }