shithub: candycrisis

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Compute frames per second

--- a/src/SDLU.cpp

+++ b/src/SDLU.cpp

@@ -47,6 +47,10 @@

 static MBoolean                s_interestedInTyping = false;

 static std::deque<BufferedKey> s_keyBuffer;

+// To compute frames per second

+static int         s_fpsAccumulator = 0;

+static int         s_fpsSampleStart = 0;

+const int          k_fpsSampleInterval = 500;

 int SDLUi_EventFilter(void*, SDL_Event *event)

 {

@@ -431,4 +435,13 @@

     SDL_RenderClear(g_renderer);

     SDL_RenderCopy(g_renderer, g_windowTexture, NULL, NULL);

     SDL_RenderPresent(g_renderer);

+    s_fpsAccumulator++;

+    int now = SDL_GetTicks();

+    int elapsed = now - s_fpsSampleStart;

+    if (elapsed > k_fpsSampleInterval) {

+        float fps = s_fpsAccumulator / (elapsed / 1000.0f);

+        printf("FPS: %.1f\n", fps);

+        s_fpsAccumulator = 0;

+        s_fpsSampleStart = now;

+    }

 }