Mercurial > sdl-ios-xcode
annotate src/SDL_android.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 | 6a10693e66c3 |
children |
rev | line source |
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4994 | 1 /* |
2 SDL - Simple DirectMedia Layer | |
3 Copyright (C) 1997-2010 Sam Lantinga | |
4 | |
5 This library is free software; you can redistribute it and/or | |
6 modify it under the terms of the GNU Lesser General Public | |
7 License as published by the Free Software Foundation; either | |
8 version 2.1 of the License, or (at your option) any later version. | |
9 | |
10 This library is distributed in the hope that it will be useful, | |
11 but WITHOUT ANY WARRANTY; without even the implied warranty of | |
12 MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU | |
13 Lesser General Public License for more details. | |
14 | |
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 | |
18 | |
19 Sam Lantinga | |
20 slouken@libsdl.org | |
21 */ | |
22 #include "SDL_config.h" | |
23 | |
24 /* Set up for C function definitions, even when using C++ */ | |
25 #ifdef __cplusplus | |
26 /* *INDENT-OFF* */ | |
27 extern "C" { | |
28 /* *INDENT-ON* */ | |
29 #endif | |
30 | |
31 /* Interface from the SDL library into the Android Java activity */ | |
5000
6a10693e66c3
Cleaned up internal accelerometer interface
Sam Lantinga <slouken@libsdl.org>
parents:
4998
diff
changeset
|
32 extern void Android_JNI_CreateContext(); |
6a10693e66c3
Cleaned up internal accelerometer interface
Sam Lantinga <slouken@libsdl.org>
parents:
4998
diff
changeset
|
33 extern void Android_JNI_SwapWindow(); |
6a10693e66c3
Cleaned up internal accelerometer interface
Sam Lantinga <slouken@libsdl.org>
parents:
4998
diff
changeset
|
34 extern void Android_JNI_SetActivityTitle(const char *title); |
6a10693e66c3
Cleaned up internal accelerometer interface
Sam Lantinga <slouken@libsdl.org>
parents:
4998
diff
changeset
|
35 extern void Android_JNI_GetAccelerometerValues(float values[3]); |
4995
9f9bea41e88f
Working audio implementation contributed by Joseph Lunderville
Sam Lantinga <slouken@libsdl.org>
parents:
4994
diff
changeset
|
36 |
9f9bea41e88f
Working audio implementation contributed by Joseph Lunderville
Sam Lantinga <slouken@libsdl.org>
parents:
4994
diff
changeset
|
37 // Audio support |
5000
6a10693e66c3
Cleaned up internal accelerometer interface
Sam Lantinga <slouken@libsdl.org>
parents:
4998
diff
changeset
|
38 extern int Android_JNI_OpenAudioDevice(int sampleRate, int is16Bit, int channelCount, int desiredBufferFrames); |
6a10693e66c3
Cleaned up internal accelerometer interface
Sam Lantinga <slouken@libsdl.org>
parents:
4998
diff
changeset
|
39 extern void* Android_JNI_GetAudioBuffer(); |
6a10693e66c3
Cleaned up internal accelerometer interface
Sam Lantinga <slouken@libsdl.org>
parents:
4998
diff
changeset
|
40 extern void Android_JNI_WriteAudioBuffer(); |
6a10693e66c3
Cleaned up internal accelerometer interface
Sam Lantinga <slouken@libsdl.org>
parents:
4998
diff
changeset
|
41 extern void Android_JNI_CloseAudioDevice(); |
4994 | 42 |
43 /* Ends C function definitions when using C++ */ | |
44 #ifdef __cplusplus | |
45 /* *INDENT-OFF* */ | |
46 } | |
47 /* *INDENT-ON* */ | |
48 #endif | |
49 | |
50 /* vi: set ts=4 sw=4 expandtab: */ |