Mercurial > sdl-ios-xcode
view src/SDL_error_c.h @ 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 | 791b3256fb22 |
children | b530ef003506 |
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/* SDL - Simple DirectMedia Layer Copyright (C) 1997-2010 Sam Lantinga This library is free software; you can redistribute it and/or modify it under the terms of the GNU Lesser General Public License as published by the Free Software Foundation; either version 2.1 of the License, or (at your option) any later version. This library is distributed in the hope that it will be useful, but WITHOUT ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU Lesser General Public License for more details. You should have received a copy of the GNU Lesser General Public License along with this library; if not, write to the Free Software Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA Sam Lantinga slouken@libsdl.org */ #include "SDL_config.h" /* This file defines a structure that carries language-independent error messages */ #ifndef _SDL_error_c_h #define _SDL_error_c_h #define ERR_MAX_STRLEN 128 #define ERR_MAX_ARGS 5 typedef struct SDL_error { /* This is a numeric value corresponding to the current error */ int error; /* This is a key used to index into a language hashtable containing internationalized versions of the SDL error messages. If the key is not in the hashtable, or no hashtable is available, the key is used directly as an error message format string. */ char key[ERR_MAX_STRLEN]; /* These are the arguments for the error functions */ int argc; union { void *value_ptr; #if 0 /* What is a character anyway? (UNICODE issues) */ unsigned char value_c; #endif int value_i; double value_f; char buf[ERR_MAX_STRLEN]; } args[ERR_MAX_ARGS]; } SDL_error; #endif /* _SDL_error_c_h */ /* vi: set ts=4 sw=4 expandtab: */