view src/libm/math.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 67ad1c88dda0
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"
#include "SDL_stdinc.h"

/* Math routines from uClibc: http://www.uclibc.org */

#ifdef HAVE_ATAN
#define atan            SDL_uclibc_atan
#else
#define atan            SDL_atan
#endif

#ifndef HAVE_ATAN2
#define __ieee754_atan2 SDL_atan2
#endif

#ifdef HAVE_COPYSIGN
#define copysign        SDL_uclibc_copysign
#else
#define copysign        SDL_copysign
#endif

#ifdef HAVE_COS
#define cos             SDL_uclibc_cos
#else
#define cos             SDL_cos
#endif

#ifdef HAVE_FABS
#define fabs            SDL_uclibc_fabs
#else
#define fabs            SDL_fabs
#endif

#ifdef HAVE_FLOOR
#define floor           SDL_uclibc_floor
#else
#define floor           SDL_floor
#endif

#ifndef HAVE_LOG
#define __ieee754_log   SDL_log
#endif

#ifndef HAVE_POW
#define __ieee754_pow   SDL_pow
#endif

#ifdef HAVE_SCALBN
#define scalbn          SDL_uclibc_scalbn
#else
#define scalbn          SDL_scalbn
#endif

#ifdef HAVE_SIN
#define sin             SDL_uclibc_sin
#else
#define sin             SDL_sin
#endif

#ifndef HAVE_SQRT
#define __ieee754_sqrt  SDL_sqrt
#endif

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