Mercurial > sdl-ios-xcode
annotate src/audio/SDL_mixer_m68k.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> |
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date | Wed, 19 Jan 2011 23:56:16 -0800 |
parents | f7b03b6838cb |
children | b530ef003506 |
rev | line source |
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1 /* |
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2 SDL - Simple DirectMedia Layer |
3697 | 3 Copyright (C) 1997-2010 Sam Lantinga |
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4 |
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5 This library is free software; you can redistribute it and/or |
3697 | 6 modify it under the terms of the GNU Lesser General Public |
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7 License as published by the Free Software Foundation; either |
3697 | 8 version 2.1 of the License, or (at your option) any later version. |
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9 |
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10 This library is distributed in the hope that it will be useful, |
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11 but WITHOUT ANY WARRANTY; without even the implied warranty of |
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12 MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU |
3697 | 13 Lesser General Public License for more details. |
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14 |
3697 | 15 You should have received a copy of the GNU Lesser General Public |
16 License along with this library; if not, write to the Free Software | |
17 Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA | |
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18 |
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19 Sam Lantinga |
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20 slouken@libsdl.org |
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21 */ |
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22 #include "SDL_config.h" |
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23 |
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24 /* |
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25 m68k assembly mix routines |
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26 |
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27 Patrice Mandin |
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28 */ |
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29 |
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30 #if defined(__M68000__) && defined(__GNUC__) |
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31 void SDL_MixAudio_m68k_U8(char *dst, char *src, long len, long volume, |
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32 char *mix8); |
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33 void SDL_MixAudio_m68k_S8(char *dst, char *src, long len, long volume); |
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34 |
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35 void SDL_MixAudio_m68k_S16MSB(short *dst, short *src, long len, long volume); |
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36 void SDL_MixAudio_m68k_S16LSB(short *dst, short *src, long len, long volume); |
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37 #endif |
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38 /* vi: set ts=4 sw=4 expandtab: */ |