1 files changed, 86 insertions, 0 deletions
diff --git a/frontends/timer.c b/frontends/timer.c
new file mode 100644
index 0000000..9ae90ca
--- /dev/null
+++ b/frontends/timer.c
@@ -0,0 +1,86 @@
+#ifdef _WIN32
+#include <windows.h>
+
+#if CETRIS_HI_RES
+static DWORD WINAPI ctrs_game_loop(void* data) {
+  ctrs_game* game = (ctrs_game*)data;
+  LARGE_INTEGER StartingTime, EndingTime, ElapsedMicroseconds;
+  LARGE_INTEGER Frequency;
+  QueryPerformanceFrequency(&Frequency);
+  QueryPerformanceCounter(&StartingTime);
+  while(1) {
+    if (game->waiting) break;
+    QueryPerformanceCounter(&EndingTime);
+    ElapsedMicroseconds.QuadPart = EndingTime.QuadPart - StartingTime.QuadPart;
+    ElapsedMicroseconds.QuadPart *= 1000000;
+    ElapsedMicroseconds.QuadPart /= Frequency.QuadPart;
+    game->timer = ElapsedMicroseconds.QuadPart;
+    game->tick = ElapsedMicroseconds.QuadPart / 1000;
+    if (!ctrs_update_game_tick(game)) {
+	    break;
+    }
+    Sleep(1);
+  }
+  return 0;
+}
+#else
+static DWORD WINAPI ctrs_game_loop(void* data) {
+  ctrs_game* game = (ctrs_game*)data;
+  while(1) {
+    if (game->waiting) break;
+    game->tick += 16;
+    if (!ctrs_update_game_tick(game)) {
+	    break;
+    }
+    Sleep(16); // little less than 60hz
+  }
+}
+#endif
+static void ctrs_start_game(ctrs_game *g) {
+  g->waiting = false;
+  HANDLE thread = CreateThread(NULL, 0, ctrs_game_loop, g, 0, NULL);
+}
+#else
+#include <pthread.h>
+#include <unistd.h>
+
+#if CETRIS_HI_RES
+#include <time.h>
+static void *ctrs_game_loop(void* data) {
+  ctrs_game *game = (ctrs_game*)data;
+  struct timespec start_time, end_time;
+  clock_gettime(CLOCK_MONOTONIC_RAW, &start_time);
+  while (1) {
+    if (game->waiting) break;
+    clock_gettime(CLOCK_MONOTONIC_RAW, &end_time);
+    long nsec_elapsed = (end_time.tv_sec - start_time.tv_sec) * (long)1e9 + (end_time.tv_nsec - start_time.tv_nsec);
+    game->timer = nsec_elapsed / 1000;
+    game->tick = nsec_elapsed / 1000000;
+    if (!ctrs_update_game_tick(game)) {
+	    break;
+    }
+    usleep(1000);
+  }
+  return 0;
+}
+#else
+static void *ctrs_game_loop(void *data) {
+  ctrs_game* game = (ctrs_game*)data;
+  while(1) {
+    if (game->waiting) break;
+    game->tick += 16;
+    if (!ctrs_update_game_tick(game)) {
+	    break;
+    }
+    // could be more accurate, keeping
+    // it consistant with windows
+    usleep(16000);
+  }
+}
+#endif
+static void ctrs_start_game(ctrs_game *g) {
+  g->waiting = false;
+  pthread_t thread;
+  pthread_create(&thread, NULL, ctrs_game_loop, (void*)g);
+}
+#endif