view include/SDL_quit.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 f7b03b6838cb
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
*/

/**
 *  \file SDL_quit.h
 *  
 *  Include file for SDL quit event handling.
 */

#ifndef _SDL_quit_h
#define _SDL_quit_h

#include "SDL_stdinc.h"
#include "SDL_error.h"

/**
 *  \file SDL_quit.h
 *  
 *  An ::SDL_QUIT event is generated when the user tries to close the application
 *  window.  If it is ignored or filtered out, the window will remain open.
 *  If it is not ignored or filtered, it is queued normally and the window
 *  is allowed to close.  When the window is closed, screen updates will 
 *  complete, but have no effect.
 *
 *  SDL_Init() installs signal handlers for SIGINT (keyboard interrupt)
 *  and SIGTERM (system termination request), if handlers do not already
 *  exist, that generate ::SDL_QUIT events as well.  There is no way
 *  to determine the cause of an ::SDL_QUIT event, but setting a signal
 *  handler in your application will override the default generation of
 *  quit events for that signal.
 *  
 *  \sa SDL_Quit()
 */

/* There are no functions directly affecting the quit event */

#define SDL_QuitRequested() \
        (SDL_PumpEvents(), SDL_PeepEvents(NULL,0,SDL_PEEKEVENT,SDL_QUITMASK))

#endif /* _SDL_quit_h */