view include/SDL_main.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 18fe0aded409
children e8916fe9cfc8
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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
*/

#ifndef _SDL_main_h
#define _SDL_main_h

#include "SDL_stdinc.h"

/**
 *  \file SDL_main.h
 *  
 *  Redefine main() on some platforms so that it is called by SDL.
 */

#if defined(__WIN32__) || \
    (defined(__MWERKS__) && !defined(__BEOS__)) || \
    defined(__SYMBIAN32__) || defined(__IPHONEOS__) || \
    defined(__ANDROID__)

#ifdef __cplusplus
#define C_LINKAGE	"C"
#else
#define C_LINKAGE
#endif /* __cplusplus */

/**
 *  \file SDL_main.h
 *
 *  The application's main() function must be called with C linkage,
 *  and should be declared like this:
 *  \code
 *  #ifdef __cplusplus
 *  extern "C"
 *  #endif
 *  int main(int argc, char *argv[])
 *  {
 *  }
 *  \endcode
 */

#define main	SDL_main

/**
 *  The prototype for the application's main() function
 */
extern C_LINKAGE int SDL_main(int argc, char *argv[]);


/* From the SDL library code -- needed for registering the app on Win32 */
#ifdef __WIN32__

#include "begin_code.h"
#ifdef __cplusplus
/* *INDENT-OFF* */
extern "C" {
/* *INDENT-ON* */
#endif

/**
 *  This can be called to set the application class at startup
 */
extern DECLSPEC int SDLCALL SDL_RegisterApp(char *name, Uint32 style,
                                            void *hInst);
extern DECLSPEC void SDLCALL SDL_UnregisterApp(void);

#ifdef __cplusplus
/* *INDENT-OFF* */
}
/* *INDENT-ON* */
#endif
#include "close_code.h"
#endif

#endif /* Need to redefine main()? */

#endif /* _SDL_main_h */

/* vi: set ts=4 sw=4 expandtab: */