Mercurial > sdl-ios-xcode
view sdl-config.in @ 5053:b5b42be9333c
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 | 62debeaac5e9 |
children |
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#!/bin/sh prefix=@prefix@ exec_prefix=@exec_prefix@ exec_prefix_set=no libdir=@libdir@ @ENABLE_STATIC_FALSE@usage="\ @ENABLE_STATIC_FALSE@Usage: sdl-config [--prefix[=DIR]] [--exec-prefix[=DIR]] [--version] [--cflags] [--libs]" @ENABLE_STATIC_TRUE@usage="\ @ENABLE_STATIC_TRUE@Usage: sdl-config [--prefix[=DIR]] [--exec-prefix[=DIR]] [--version] [--cflags] [--libs] [--static-libs]" if test $# -eq 0; then echo "${usage}" 1>&2 exit 1 fi while test $# -gt 0; do case "$1" in -*=*) optarg=`echo "$1" | sed 's/[-_a-zA-Z0-9]*=//'` ;; *) optarg= ;; esac case $1 in --prefix=*) prefix=$optarg if test $exec_prefix_set = no ; then exec_prefix=$optarg fi ;; --prefix) echo $prefix ;; --exec-prefix=*) exec_prefix=$optarg exec_prefix_set=yes ;; --exec-prefix) echo $exec_prefix ;; --version) echo @SDL_VERSION@ ;; --cflags) echo -I@includedir@/SDL @SDL_CFLAGS@ ;; @ENABLE_SHARED_TRUE@ --libs) @ENABLE_SHARED_TRUE@ echo -L@libdir@ @SDL_RLD_FLAGS@ @SDL_LIBS@ @ENABLE_SHARED_TRUE@ ;; @ENABLE_STATIC_TRUE@@ENABLE_SHARED_TRUE@ --static-libs) @ENABLE_STATIC_TRUE@@ENABLE_SHARED_FALSE@ --libs|--static-libs) @ENABLE_STATIC_TRUE@ echo -L@libdir@ @SDL_RLD_FLAGS@ @SDL_STATIC_LIBS@ @ENABLE_STATIC_TRUE@ ;; *) echo "${usage}" 1>&2 exit 1 ;; esac shift done