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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 | 7b1d35d98294 |
| children |
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syntax:glob aclocal.m4 autom4te* config.cache config.log config.status configure libtool Makefile sdl-config SDL.spec SDL.qpg build build-deps VisualC VisualCE # for Xcode *.orig *.swp *.tmp *.rej *~ *.o *.mode1* *.model* *.perspective* *.perspective* *.pbxuser (^|/)build($|/) .DS_Store sdl.pc include/SDL_config.h include/SDL_revision.h test/aclocal.m4 test/autom4te* test/config.cache test/config.log test/config.status test/configure test/Makefile test/SDL.dll test/stdout.txt test/stderr.txt test/checkkeys test/graywin test/loopwave test/testalpha test/testatomic test/testaudioinfo test/testbitmap test/testblitspeed test/testcdrom test/testcursor test/testdraw2 test/testdyngl test/testdyngles test/testerror test/testeyes test/testfile test/testfill test/testgamma test/testgesture test/testgl test/testgl2 test/testgles test/testhaptic test/testhread test/testiconv test/testime test/testintersections test/testjoystick test/testkeys test/testloadso test/testlock test/testmmousetablet test/testmultiaudio test/testoverlay test/testoverlay2 test/testpalette test/testplatform test/testpower test/testresample test/testsem test/testsprite test/testsprite2 test/testspriteminimal test/testtimer test/testver test/testvidinfo test/testwin test/testwm test/testwm2 test/threadwin test/torturethread test/*.exe test/*.dSYM