src/app/app.cpp

   1 #include "Application.hpp"
   2 #include "Assets.hpp"
   3 #include "Environment.hpp"
   4 #include "FrameCounter.hpp"
   5 #include "State.hpp"
   6 #include "StateControl.hpp"
   7 #include "TextureIndex.hpp"
   8
   9 #include "init.hpp"
  10 #include "../audio/Sound.hpp"
  11 #include "../graphics/ArrayTexture.hpp"
  12 #include "../graphics/Font.hpp"
  13 #include "../graphics/Texture.hpp"
  14 #include "../io/TokenStreamReader.hpp"
  15 #include "../model/shapes.hpp"
  16 #include "../world/BlockType.hpp"
  17 #include "../world/BlockTypeRegistry.hpp"
  18 #include "../world/Entity.hpp"
  19
  20 #include <fstream>
  21 #include <iostream>
  22 #include <stdexcept>
  23 #include <SDL_image.h>
  24
  25 using std::runtime_error;
  26 using std::string;
  27
  28
  29 namespace blank {
  30
  31 Application::Application(Environment &e)
  32 : env(e)
  33 , states() {
  34
  35 }
  36
  37 Application::~Application() {
  38         env.audio.StopAll();
  39 }
  40
  41
  42 void Application::RunN(size_t n) {
  43         Uint32 last = SDL_GetTicks();
  44         for (size_t i = 0; HasState() && i < n; ++i) {
  45                 Uint32 now = SDL_GetTicks();
  46                 int delta = now - last;
  47                 Loop(delta);
  48                 last = now;
  49         }
  50 }
  51
  52 void Application::RunT(size_t t) {
  53         Uint32 last = SDL_GetTicks();
  54         Uint32 finish = last + t;
  55         while (HasState() && last < finish) {
  56                 Uint32 now = SDL_GetTicks();
  57                 int delta = now - last;
  58                 Loop(delta);
  59                 last = now;
  60         }
  61 }
  62
  63 void Application::RunS(size_t n, size_t t) {
  64         for (size_t i = 0; HasState() && i < n; ++i) {
  65                 Loop(t);
  66         }
  67 }
  68
  69
  70 void Application::Run() {
  71         Uint32 last = SDL_GetTicks();
  72         env.window.GrabMouse();
  73         while (HasState()) {
  74                 Uint32 now = SDL_GetTicks();
  75                 int delta = now - last;
  76                 Loop(delta);
  77                 last = now;
  78         }
  79 }
  80
  81 void Application::Loop(int dt) {
  82         env.counter.EnterFrame();
  83         HandleEvents();
  84         if (!HasState()) return;
  85         Update(dt);
  86         env.state.Commit(*this);
  87         if (!HasState()) return;
  88         Render();
  89         env.counter.ExitFrame();
  90 }
  91
  92
  93 void Application::HandleEvents() {
  94         env.counter.EnterHandle();
  95         SDL_Event event;
  96         while (HasState() && SDL_PollEvent(&event)) {
  97                 Handle(event);
  98                 env.state.Commit(*this);
  99         }
 100         env.counter.ExitHandle();
 101 }
 102
 103 void Application::Handle(const SDL_Event &event) {
 104         switch (event.type) {
 105                 case SDL_WINDOWEVENT:
 106                         Handle(event.window);
 107                         break;
 108                 default:
 109                         GetState().Handle(event);
 110                         break;
 111         }
 112 }
 113
 114 void Application::Handle(const SDL_WindowEvent &event) {
 115         switch (event.event) {
 116                 case SDL_WINDOWEVENT_FOCUS_GAINED:
 117                         env.window.GrabMouse();
 118                         break;
 119                 case SDL_WINDOWEVENT_FOCUS_LOST:
 120                         env.window.ReleaseMouse();
 121                         break;
 122                 case SDL_WINDOWEVENT_RESIZED:
 123                         env.viewport.Resize(event.data1, event.data2);
 124                         break;
 125                 default:
 126                         break;
 127         }
 128 }
 129
 130 void Application::Update(int dt) {
 131         env.counter.EnterUpdate();
 132         if (HasState()) {
 133                 GetState().Update(dt);
 134         }
 135         env.counter.ExitUpdate();
 136 }
 137
 138 void Application::Render() {
 139         // gl implementation may (and will probably) delay vsync blocking until
 140         // the first write after flipping, which is this clear call
 141         env.viewport.Clear();
 142         env.counter.EnterRender();
 143
 144         if (HasState()) {
 145                 GetState().Render(env.viewport);
 146         }
 147
 148         env.counter.ExitRender();
 149         env.window.Flip();
 150 }
 151
 152
 153 void Application::PushState(State *s) {
 154         if (!states.empty()) {
 155                 states.top()->OnPause();
 156         }
 157         states.emplace(s);
 158         ++s->ref_count;
 159         if (s->ref_count == 1) {
 160                 s->OnEnter();
 161         }
 162         s->OnResume();
 163 }
 164
 165 State *Application::PopState() {
 166         State *s = states.top();
 167         states.pop();
 168         s->OnPause();
 169         s->OnExit();
 170         if (!states.empty()) {
 171                 states.top()->OnResume();
 172         }
 173         return s;
 174 }
 175
 176 State *Application::SwitchState(State *s_new) {
 177         State *s_old = states.top();
 178         states.top() = s_new;
 179         --s_old->ref_count;
 180         ++s_new->ref_count;
 181         s_old->OnPause();
 182         if (s_old->ref_count == 0) {
 183                 s_old->OnExit();
 184         }
 185         if (s_new->ref_count == 1) {
 186                 s_new->OnEnter();
 187         }
 188         s_new->OnResume();
 189         return s_old;
 190 }
 191
 192 State &Application::GetState() {
 193         return *states.top();
 194 }
 195
 196 bool Application::HasState() const noexcept {
 197         return !states.empty();
 198 }
 199
 200
 201 void StateControl::Commit(Application &app) {
 202         while (!cue.empty()) {
 203                 Memo m(cue.front());
 204                 cue.pop();
 205                 switch (m.cmd) {
 206                         case PUSH:
 207                                 app.PushState(m.state);
 208                                 break;
 209                         case SWITCH:
 210                                 app.SwitchState(m.state);
 211                                 break;
 212                         case POP:
 213                                 app.PopState();
 214                                 break;
 215                         case POP_ALL:
 216                                 while (app.HasState()) {
 217                                         app.PopState();
 218                                 }
 219                                 break;
 220                 }
 221         }
 222 }
 223
 224
 225 Assets::Assets(const string &base)
 226 : fonts(base + "fonts/")
 227 , sounds(base + "sounds/")
 228 , textures(base + "textures/")
 229 , data(base + "data/")
 230 , large_ui_font(LoadFont("DejaVuSans", 24))
 231 , small_ui_font(LoadFont("DejaVuSans", 16)) {
 232
 233 }
 234
 235 namespace {
 236
 237 CuboidShape block_shape({{ -0.5f, -0.5f, -0.5f }, { 0.5f, 0.5f, 0.5f }});
 238 StairShape stair_shape({{ -0.5f, -0.5f, -0.5f }, { 0.5f, 0.5f, 0.5f }}, { 0.0f, 0.0f });
 239 CuboidShape slab_shape({{ -0.5f, -0.5f, -0.5f }, { 0.5f, 0.0f, 0.5f }});
 240
 241 }
 242
 243 void Assets::LoadBlockTypes(const std::string &set_name, BlockTypeRegistry &reg, TextureIndex &tex_index) const {
 244         string full = data + set_name + ".types";
 245         std::ifstream file(full);
 246         if (!file) {
 247                 throw std::runtime_error("failed to open block type file " + full);
 248         }
 249         TokenStreamReader in(file);
 250         string type_name;
 251         string name;
 252         string tex_name;
 253         string shape_name;
 254         while (in.HasMore()) {
 255                 in.ReadIdentifier(type_name);
 256                 in.Skip(Token::EQUALS);
 257                 BlockType type;
 258
 259                 // read block type
 260                 in.Skip(Token::ANGLE_BRACKET_OPEN);
 261                 while (in.Peek().type != Token::ANGLE_BRACKET_CLOSE) {
 262                         in.ReadIdentifier(name);
 263                         in.Skip(Token::EQUALS);
 264                         if (name == "visible") {
 265                                 type.visible = in.GetBool();
 266                         } else if (name == "texture") {
 267                                 in.ReadString(tex_name);
 268                                 type.texture = tex_index.GetID(tex_name);
 269                         } else if (name == "color") {
 270                                 in.ReadVec(type.color);
 271                         } else if (name == "label") {
 272                                 in.ReadString(type.label);
 273                         } else if (name == "luminosity") {
 274                                 type.luminosity = in.GetInt();
 275                         } else if (name == "block_light") {
 276                                 type.block_light = in.GetBool();
 277                         } else if (name == "collision") {
 278                                 type.collision = in.GetBool();
 279                         } else if (name == "collide_block") {
 280                                 type.collide_block = in.GetBool();
 281                         } else if (name == "shape") {
 282                                 in.ReadIdentifier(shape_name);
 283                                 if (shape_name == "block") {
 284                                         type.shape = &block_shape;
 285                                         type.fill = {  true,  true,  true,  true,  true,  true };
 286                                 } else if (shape_name == "slab") {
 287                                         type.shape = &slab_shape;
 288                                         type.fill = { false,  true, false, false, false, false };
 289                                 } else if (shape_name == "stair") {
 290                                         type.shape = &stair_shape;
 291                                         type.fill = { false,  true, false, false, false,  true };
 292                                 } else {
 293                                         throw runtime_error("unknown block shape: " + shape_name);
 294                                 }
 295                         } else {
 296                                 throw runtime_error("unknown block property: " + name);
 297                         }
 298                         in.Skip(Token::SEMICOLON);
 299                 }
 300                 in.Skip(Token::ANGLE_BRACKET_CLOSE);
 301                 in.Skip(Token::SEMICOLON);
 302
 303                 reg.Add(type);
 304         }
 305 }
 306
 307 Font Assets::LoadFont(const string &name, int size) const {
 308         string full = fonts + name + ".ttf";
 309         return Font(full.c_str(), size);
 310 }
 311
 312 Sound Assets::LoadSound(const string &name) const {
 313         string full = sounds + name + ".wav";
 314         return Sound(full.c_str());
 315 }
 316
 317 Texture Assets::LoadTexture(const string &name) const {
 318         string full = textures + name + ".png";
 319         Texture tex;
 320         SDL_Surface *srf = IMG_Load(full.c_str());
 321         if (!srf) {
 322                 throw SDLError("IMG_Load");
 323         }
 324         tex.Bind();
 325         tex.Data(*srf);
 326         SDL_FreeSurface(srf);
 327         return tex;
 328 }
 329
 330 void Assets::LoadTexture(const string &name, ArrayTexture &tex, int layer) const {
 331         string full = textures + name + ".png";
 332         SDL_Surface *srf = IMG_Load(full.c_str());
 333         if (!srf) {
 334                 throw SDLError("IMG_Load");
 335         }
 336         tex.Bind();
 337         try {
 338                 tex.Data(layer, *srf);
 339         } catch (...) {
 340                 SDL_FreeSurface(srf);
 341                 throw;
 342         }
 343         SDL_FreeSurface(srf);
 344 }
 345
 346 void Assets::LoadTextures(const TextureIndex &index, ArrayTexture &tex) const {
 347         // TODO: where the hell should that size come from?
 348         tex.Reserve(16, 16, index.Size(), Format());
 349         for (const auto &entry : index.Entries()) {
 350                 LoadTexture(entry.first, tex, entry.second);
 351         }
 352 }
 353
 354
 355 TextureIndex::TextureIndex()
 356 : id_map() {
 357
 358 }
 359
 360 int TextureIndex::GetID(const string &name) {
 361         auto entry = id_map.find(name);
 362         if (entry == id_map.end()) {
 363                 auto result = id_map.emplace(name, Size());
 364                 return result.first->second;
 365         } else {
 366                 return entry->second;
 367         }
 368 }
 369
 370
 371 void FrameCounter::EnterFrame() noexcept {
 372         last_enter = SDL_GetTicks();
 373         last_tick = last_enter;
 374 }
 375
 376 void FrameCounter::EnterHandle() noexcept {
 377         Tick();
 378 }
 379
 380 void FrameCounter::ExitHandle() noexcept {
 381         current.handle = Tick();
 382 }
 383
 384 void FrameCounter::EnterUpdate() noexcept {
 385         Tick();
 386 }
 387
 388 void FrameCounter::ExitUpdate() noexcept {
 389         current.update = Tick();
 390 }
 391
 392 void FrameCounter::EnterRender() noexcept {
 393         Tick();
 394 }
 395
 396 void FrameCounter::ExitRender() noexcept {
 397         current.render = Tick();
 398 }
 399
 400 void FrameCounter::ExitFrame() noexcept {
 401         Uint32 now = SDL_GetTicks();
 402         current.total = now - last_enter;
 403         current.running = current.handle + current.update + current.render;
 404         current.waiting = current.total - current.running;
 405         Accumulate();
 406
 407         ++cur_frame;
 408         if (cur_frame >= NUM_FRAMES) {
 409                 Push();
 410                 cur_frame = 0;
 411                 changed = true;
 412         } else {
 413                 changed = false;
 414         }
 415 }
 416
 417 int FrameCounter::Tick() noexcept {
 418         Uint32 now = SDL_GetTicks();
 419         int delta = now - last_tick;
 420         last_tick = now;
 421         return delta;
 422 }
 423
 424 void FrameCounter::Accumulate() noexcept {
 425         sum.handle += current.handle;
 426         sum.update += current.update;
 427         sum.render += current.render;
 428         sum.running += current.running;
 429         sum.waiting += current.waiting;
 430         sum.total += current.total;
 431
 432         max.handle = std::max(current.handle, max.handle);
 433         max.update = std::max(current.update, max.update);
 434         max.render = std::max(current.render, max.render);
 435         max.running = std::max(current.running, max.running);
 436         max.waiting = std::max(current.waiting, max.waiting);
 437         max.total = std::max(current.total, max.total);
 438
 439         current = Frame<int>();
 440 }
 441
 442 void FrameCounter::Push() noexcept {
 443         peak = max;
 444         avg.handle = sum.handle * factor;
 445         avg.update = sum.update * factor;
 446         avg.render = sum.render * factor;
 447         avg.running = sum.running * factor;
 448         avg.waiting = sum.waiting * factor;
 449         avg.total = sum.total * factor;
 450
 451         sum = Frame<int>();
 452         max = Frame<int>();
 453 }
 454
 455 }