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Fixed bug #1026
Vittorio Giovara 2010-07-16 19:09:28 PDT
i was reading SDL_renderer_gles and i noticed that every time we there
is some gl call the gl state is modified with a couple of
glEnableClientState()/glDisableClientState.
While this is completely fine for desktops systems, this is a major
performace kill on mobile devices, right where opengles is
implemented.
Normal practice in this case is to update the glstate once, keep it
always the same and disable/enable other states only in very special
occasions.
On the web there's plenty of documentation (on the top of my head
http://developer.apple.com/iphone/library/documentation/3DDrawing/Conceptual/OpenGLES_ProgrammingGuide/Performance/Performance.html#//apple_ref/doc/uid/TP40008793-CH105-SW5
) and i personally tried this.
I modified my code and got a 10 fps boost, then modified SDL_render_gles and
shifted from 40 fps to 50 fps alone -- considering that i started from ~30fps i
got an 80% performance increase with this technique.
I have attached a dif of my changes, hope that it will be included in
mainstream.
| author | Sam Lantinga <slouken@libsdl.org> |
|---|---|
| date | Wed, 19 Jan 2011 23:56:16 -0800 |
| parents | a0e096916474 |
| children |
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These are test programs for the SDL library: checkkeys Watch the key events to check the keyboard graywin Display a gray gradient and center mouse on spacebar loopwave Audio test -- loop playing a WAV file testalpha Display an alpha faded icon -- paint with mouse testaudioinfo Lists audio device capabilities testbitmap Test displaying 1-bit bitmaps testblitspeed Tests performance of SDL's blitters and converters. testcdrom Sample audio CD control program testcursor Tests custom mouse cursor testdyngl Tests dynamically loading OpenGL library testerror Tests multi-threaded error handling testfile Tests RWops layer testgamma Tests video device gamma ramp testgl A very simple example of using OpenGL with SDL testgl2 An even simpler example using the SDL 1.3 API testhread Hacked up test of multi-threading testiconv Tests international string conversion testjoystick List joysticks and watch joystick events testkeys List the available keyboard keys testloadso Tests the loadable library layer testlock Hacked up test of multi-threading and locking testmultiaudio Tests using several audio devices testoverlay Tests the software/hardware overlay functionality. testoverlay2 Tests the overlay flickering/scaling during playback. testpalette Tests palette color cycling testplatform Tests types, endianness and cpu capabilities testsem Tests SDL's semaphore implementation testshape Tests shaped windows testsprite Example of fast sprite movement on the screen testsprite2 Improved version of testsprite testtimer Test the timer facilities testver Check the version and dynamic loading and endianness testvidinfo Show the pixel format of the display and perfom the benchmark testwin Display a BMP image at various depths testwm Test window manager -- title, icon, events testwm2 Improved version of testwm threadwin Test multi-threaded event handling torturethread Simple test for thread creation/destruction