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Improved GetFPS() calculation for average

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This commit is contained in:
Ray 2020-02-19 12:20:15 +01:00
parent 9eefcb7939
commit d62a2f793f
2 changed files with 23 additions and 19 deletions
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23
src/core.c
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@ -1611,9 +1611,30 @@ void SetTargetFPS(int fps)
}
// Returns current FPS
// NOTE: We calculate an average framerate
int GetFPS(void)
{
return (int)roundf(1.0f/GetFrameTime());
#define FPS_CAPTURE_FRAMES_COUNT 30 // 30 captures
#define FPS_AVERAGE_TIME_SECONDS 0.5f // 500 millisecondes
#define FPS_STEP (FPS_AVERAGE_TIME_SECONDS/FPS_CAPTURE_FRAMES_COUNT)
static int index = 0;
static float history[FPS_CAPTURE_FRAMES_COUNT] = { 0 };
static float average = 0, last = 0;
float fpsFrame = GetFrameTime();
if (fpsFrame == 0) return 0;
if ((GetTime() - last) > FPS_STEP)
{
last = GetTime();
index = (index + 1)%FPS_CAPTURE_FRAMES_COUNT;
average -= history[index];
history[index] = fpsFrame/FPS_CAPTURE_FRAMES_COUNT;
average += history[index];
}
return (int)roundf(1.0f/average);
}
// Returns time in seconds for last frame drawn

19
src/text.c
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@ -768,24 +768,7 @@ void UnloadFont(Font font)
// NOTE: Uses default font
void DrawFPS(int posX, int posY)
{
// NOTE: We are rendering fps every certain time for better viewing on high framerates
static int fps = 0;
static int counter = 0;
static int refreshRate = 20;
if (counter < refreshRate) counter++;
else
{
fps = GetFPS();
refreshRate = fps;
counter = 0;
}
// TODO: Find a better way to calculate FPS, maybe calculate the mean of multiple measures?
// NOTE: We have rounding errors every frame, so it oscillates a lot
DrawText(TextFormat("%2i FPS", fps), posX, posY, 20, LIME);
DrawText(TextFormat("%2i FPS", GetFPS()), posX, posY, 20, LIME);
}
// Draw text (using default font)