init

1 files changed, 143 insertions, 0 deletions

diff --git a/source/game.c b/source/game.c
new file mode 100644
index 0000000..2ade12a
--- /dev/null
+++ b/source/game.c
@@ -0,0 +1,143 @@
+#include "all.h"
+
+void GameInitialize(game_t * game, char * window_name) {
+  SetConfigFlags(FLAG_WINDOW_RESIZABLE);
+  SetTraceLogLevel(LOG_NONE);
+  /* :config */
+  game->horizontal = 1920;
+  game->vertical = 1080;
+  InitWindow(game->horizontal, game->vertical, window_name);
+  game->ups = 60;
+  game->fps = 30;
+  game->font = DefaultFont("fonts/Atkinson/mono/AtkinsonHyperlegibleMono-Bold.otf");
+  /* :setup */
+  SetWindowState(FLAG_WINDOW_HIDDEN);
+  InitAudioDevice();
+  SetWindowPosition(0, 0);
+  GuiLoadStyleDarkSimple();
+  GuiSetFont(game->font);
+  /* --- */
+}
+
+void GameDeinitialize(game_t * game) {
+  SetWindowState(FLAG_WINDOW_HIDDEN);
+  UnloadFont(game->font);
+  CloseAudioDevice();
+  CloseWindow();
+}
+
+void GameLoop(game_t * game) {
+
+  #define StepStart(prefix)                                     \
+  prefix##_delta = timespec_sub(now, prefix##_last);            \
+  if (timespec_cmp(prefix##_delta, prefix##_interval) >= 0) { (void) 0
+
+  #define StepStop(prefix)                                              \
+    prefix##s_per_second++;                                             \
+    prefix##_total++;                                                   \
+    prefix##_last = timespec_add(prefix##_last, prefix##_interval);     \
+    if (timespec_cmp(prefix##_last, now) < 0) {                         \
+      prefix##_last = now;                                              \
+    }                                                                   \
+  }
+
+  #define StepSimpleStart(prefix,linear)                                \
+    prefix##_delta = timespec_sub(now, prefix##_last);                  \
+    if (timespec_cmp(prefix##_delta, (timespec_t){1.,0.}) >= 0) {  \
+      (void)0
+
+  #define StepSimpleStop(prefix)                        \
+    prefix##_last = now;                                \
+  }
+
+  timespec_t
+    now,
+    update_interval = {0, (f64) TIMESPEC_HZ / game->ups},
+    frame_interval = {0, (f64) TIMESPEC_HZ / game->fps},
+    update_last, frame_last, print_last,
+    update_delta, frame_delta, print_delta,
+    wait;
+
+  u16
+    updates_per_second = 0, frames_per_second = 0;
+
+  u32
+    frame_total = 0, update_total = 0;
+
+  f64 interpolation = 0.;
+
+  ClearWindowState(FLAG_WINDOW_HIDDEN);
+
+  clock_gettime(CLOCK_MONOTONIC, &now);
+  update_last = frame_last = print_last = now;
+
+  while (1) {
+    StepStart(update);
+    if (GameUpdate(game, now)) { return; }
+    StepStop(update);
+
+    StepStart(frame);
+    clock_gettime(CLOCK_MONOTONIC, &now);
+    interpolation =
+      CLAMP(
+	TIMESPEC_TO_F64(update_delta)
+	/ TIMESPEC_TO_F64(update_interval),
+	0.0, 1.0f);
+    GameRender(game, interpolation);
+    StepStop(frame);
+
+    clock_gettime(CLOCK_MONOTONIC, &now);
+
+    wait = timespec_sub(
+      timespec_min(
+	timespec_add(update_last, update_interval),
+	timespec_add(frame_last, frame_interval)),
+      now);
+
+    if (timespec_cmp(wait, zero_seconds) > 0) {
+      nanosleep(&wait, NULL);
+    }
+
+    StepSimpleStart(print, one_second);
+    GameReport(game,
+	       round(frames_per_second / TIMESPEC_TO_F64(print_delta)),
+	       round(updates_per_second / TIMESPEC_TO_F64(print_delta)),
+	       frame_total,
+	       update_total);
+    frames_per_second = updates_per_second = 0;
+    StepSimpleStop(print);
+
+    clock_gettime(CLOCK_MONOTONIC, &now);
+  }
+}
+
+i16 GameUpdate(game_t * game, timespec_t now) {
+  (void) now;
+
+  PollInputEvents();
+  if (IsWindowResized()) {
+    game->horizontal = GetScreenWidth();
+    game->vertical = GetScreenHeight();
+  }
+  switch (GetKeyPressed()) {
+  case KEY_ESCAPE: return 1;
+  }
+  return 0;
+}
+
+void GameRender(game_t * game, f64 interpolation) {
+  (void)interpolation;
+
+  BeginDrawing();
+  ClearBackground(BLACK);
+  /* >>> */
+  
+  /* --- */
+  rlDrawRenderBatchActive();
+  SwapScreenBuffer();
+}
+
+void GameReport(game_t * game, f32 fps, f32 ups, u32 total_fps, u32 total_ups) {
+  printf("[FPS|UPS|Total] (%3.0f : %3.0f) | [%7u/%7u]\n",
+	 fps, ups, total_fps, total_ups);
+}