Re: [pygame] Limited FPS?

["Chris Smith" <maximinus@xxxxxxxxx>]

Well, I did some quick profiling, and here is what I mean.

If we say that I have a maximum FPS of 60, and each 'frame' takes just over 1/60th of a second, then yes, I will get 30 FPS as the screen flipping waits patiently for the raster to get back to the start of the screen.

My original code got this (a few functions removed from the profile output not relevant):

Software surface (turned out to be quicker than a hardware surface), 30 FPS:

   ncalls  tottime  percall  cumtime  percall filename:lineno(function)
    64120    9.394    0.000    9.394    0.000 {method 'blit' of 'pygame.Surface' objects}
      610    1.505    0.002    1.505    0.002 {method 'fill' of 'pygame.Surface' objects}
      610    7.860    0.013    7.860    0.013 {pygame.display.update}

So I culled 2/3's of the blitted objects (they are all 64*64 images):

Only blit about one third, in software, 39 FPS:

   ncalls  tottime  percall  cumtime  percall filename:lineno(function)
    22600    3.236    0.000    3.236    0.000 {method 'blit' of 'pygame.Surface' objects}
      610    1.208    0.002    1.208    0.002 {method 'fill' of 'pygame.Surface' objects}
      610   10.163    0.017   10.163    0.017 {pygame.display.update}

So now my blitting is 3x faster but - hey update is taking *longer*! I thought I would see a 'sudden' jump from 30 FPS to 60, but that is simply not the case. Just for comparison, I tried it with *no* blits:

No blits or fills, 120 FPS

   ncalls  tottime  percall  cumtime  percall filename:lineno(function)
      610    5.115    0.008    5.115    0.008 {pygame.display.update}

Seems logical enough. but that middle result at 39 FPS I don't understand.

Chris

2008/11/20 Jake b <ninmonkeys@xxxxxxxxx>

My guess is your surface type is wrong/not matching, so its re-converting it on every op, making it slow.

For fills, I think you want software surface, not hardware

(If you mix a hardware surface with a software one, or there might be other bad combinations too )
--
Jake