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
   8 #include "init.hpp"
   9 #include "../audio/Sound.hpp"
  10 #include "../graphics/Font.hpp"
  11 #include "../world/BlockType.hpp"
  12 #include "../world/Entity.hpp"
  13
  14 #include <iostream>
  15 #include <stdexcept>
  16
  17 using std::string;
  18
  19
  20 namespace blank {
  21
  22 Application::Application(Environment &e)
  23 : env(e)
  24 , states() {
  25
  26 }
  27
  28 Application::~Application() {
  29         env.audio.StopAll();
  30 }
  31
  32
  33 void Application::RunN(size_t n) {
  34         Uint32 last = SDL_GetTicks();
  35         for (size_t i = 0; HasState() && i < n; ++i) {
  36                 Uint32 now = SDL_GetTicks();
  37                 int delta = now - last;
  38                 Loop(delta);
  39                 last = now;
  40         }
  41 }
  42
  43 void Application::RunT(size_t t) {
  44         Uint32 last = SDL_GetTicks();
  45         Uint32 finish = last + t;
  46         while (HasState() && last < finish) {
  47                 Uint32 now = SDL_GetTicks();
  48                 int delta = now - last;
  49                 Loop(delta);
  50                 last = now;
  51         }
  52 }
  53
  54 void Application::RunS(size_t n, size_t t) {
  55         for (size_t i = 0; HasState() && i < n; ++i) {
  56                 Loop(t);
  57         }
  58 }
  59
  60
  61 void Application::Run() {
  62         Uint32 last = SDL_GetTicks();
  63         env.window.GrabMouse();
  64         while (HasState()) {
  65                 Uint32 now = SDL_GetTicks();
  66                 int delta = now - last;
  67                 Loop(delta);
  68                 last = now;
  69         }
  70 }
  71
  72 void Application::Loop(int dt) {
  73         env.counter.EnterFrame();
  74         HandleEvents();
  75         if (!HasState()) return;
  76         Update(dt);
  77         env.state.Commit(*this);
  78         if (!HasState()) return;
  79         Render();
  80         env.counter.ExitFrame();
  81 }
  82
  83
  84 void Application::HandleEvents() {
  85         env.counter.EnterHandle();
  86         SDL_Event event;
  87         while (HasState() && SDL_PollEvent(&event)) {
  88                 Handle(event);
  89                 env.state.Commit(*this);
  90         }
  91         env.counter.ExitHandle();
  92 }
  93
  94 void Application::Handle(const SDL_Event &event) {
  95         switch (event.type) {
  96                 case SDL_QUIT:
  97                         env.state.PopAll();
  98                         break;
  99                 case SDL_WINDOWEVENT:
 100                         Handle(event.window);
 101                         break;
 102                 default:
 103                         GetState().Handle(event);
 104                         break;
 105         }
 106 }
 107
 108 void Application::Handle(const SDL_WindowEvent &event) {
 109         switch (event.event) {
 110                 case SDL_WINDOWEVENT_FOCUS_GAINED:
 111                         env.window.GrabMouse();
 112                         break;
 113                 case SDL_WINDOWEVENT_FOCUS_LOST:
 114                         env.window.ReleaseMouse();
 115                         break;
 116                 case SDL_WINDOWEVENT_RESIZED:
 117                         env.viewport.Resize(event.data1, event.data2);
 118                         break;
 119                 default:
 120                         break;
 121         }
 122 }
 123
 124 void Application::Update(int dt) {
 125         env.counter.EnterUpdate();
 126         if (HasState()) {
 127                 GetState().Update(dt);
 128         }
 129         env.counter.ExitUpdate();
 130 }
 131
 132 void Application::Render() {
 133         // gl implementation may (and will probably) delay vsync blocking until
 134         // the first write after flipping, which is this clear call
 135         env.viewport.Clear();
 136         env.counter.EnterRender();
 137
 138         if (HasState()) {
 139                 GetState().Render(env.viewport);
 140         }
 141
 142         env.counter.ExitRender();
 143         env.window.Flip();
 144 }
 145
 146
 147 void Application::PushState(State *s) {
 148         states.emplace(s);
 149 }
 150
 151 State *Application::PopState() {
 152         State *s = states.top();
 153         states.pop();
 154         return s;
 155 }
 156
 157 State *Application::SwitchState(State *s_new) {
 158         State *s_old = states.top();
 159         states.top() = s_new;
 160         return s_old;
 161 }
 162
 163 State &Application::GetState() {
 164         return *states.top();
 165 }
 166
 167 bool Application::HasState() const noexcept {
 168         return !states.empty();
 169 }
 170
 171
 172 void StateControl::Commit(Application &app) {
 173         while (!cue.empty()) {
 174                 Memo m(cue.front());
 175                 cue.pop();
 176                 switch (m.cmd) {
 177                         case PUSH:
 178                                 app.PushState(m.state);
 179                                 break;
 180                         case SWITCH:
 181                                 app.SwitchState(m.state);
 182                                 break;
 183                         case POP:
 184                                 app.PopState();
 185                                 break;
 186                         case POP_ALL:
 187                                 while (app.HasState()) {
 188                                         app.PopState();
 189                                 }
 190                                 break;
 191                 }
 192         }
 193 }
 194
 195
 196 Assets::Assets(const string &base)
 197 : fonts(base + "fonts/")
 198 , sounds(base + "sounds/") {
 199
 200 }
 201
 202 Font Assets::LoadFont(const string &name, int size) const {
 203         string full = fonts + name + ".ttf";
 204         return Font(full.c_str(), size);
 205 }
 206
 207 Sound Assets::LoadSound(const string &name) const {
 208         string full = sounds + name + ".wav";
 209         return Sound(full.c_str());
 210 }
 211
 212
 213 void FrameCounter::EnterFrame() noexcept {
 214         last_enter = SDL_GetTicks();
 215         last_tick = last_enter;
 216 }
 217
 218 void FrameCounter::EnterHandle() noexcept {
 219         Tick();
 220 }
 221
 222 void FrameCounter::ExitHandle() noexcept {
 223         current.handle = Tick();
 224 }
 225
 226 void FrameCounter::EnterUpdate() noexcept {
 227         Tick();
 228 }
 229
 230 void FrameCounter::ExitUpdate() noexcept {
 231         current.update = Tick();
 232 }
 233
 234 void FrameCounter::EnterRender() noexcept {
 235         Tick();
 236 }
 237
 238 void FrameCounter::ExitRender() noexcept {
 239         current.render = Tick();
 240 }
 241
 242 void FrameCounter::ExitFrame() noexcept {
 243         Uint32 now = SDL_GetTicks();
 244         current.total = now - last_enter;
 245         current.running = current.handle + current.update + current.render;
 246         current.waiting = current.total - current.running;
 247         Accumulate();
 248
 249         ++cur_frame;
 250         if (cur_frame >= NUM_FRAMES) {
 251                 Push();
 252                 cur_frame = 0;
 253                 changed = true;
 254         } else {
 255                 changed = false;
 256         }
 257 }
 258
 259 int FrameCounter::Tick() noexcept {
 260         Uint32 now = SDL_GetTicks();
 261         int delta = now - last_tick;
 262         last_tick = now;
 263         return delta;
 264 }
 265
 266 void FrameCounter::Accumulate() noexcept {
 267         sum.handle += current.handle;
 268         sum.update += current.update;
 269         sum.render += current.render;
 270         sum.running += current.running;
 271         sum.waiting += current.waiting;
 272         sum.total += current.total;
 273
 274         max.handle = std::max(current.handle, max.handle);
 275         max.update = std::max(current.update, max.update);
 276         max.render = std::max(current.render, max.render);
 277         max.running = std::max(current.running, max.running);
 278         max.waiting = std::max(current.waiting, max.waiting);
 279         max.total = std::max(current.total, max.total);
 280
 281         current = Frame<int>();
 282 }
 283
 284 void FrameCounter::Push() noexcept {
 285         peak = max;
 286         avg.handle = sum.handle * factor;
 287         avg.update = sum.update * factor;
 288         avg.render = sum.render * factor;
 289         avg.running = sum.running * factor;
 290         avg.waiting = sum.waiting * factor;
 291         avg.total = sum.total * factor;
 292
 293         sum = Frame<int>();
 294         max = Frame<int>();
 295 }
 296
 297 }