Mercurial > sdl-ios-xcode
annotate src/audio/SDL_sysaudio.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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0 | 1 /* |
2 SDL - Simple DirectMedia Layer | |
3697 | 3 Copyright (C) 1997-2010 Sam Lantinga |
0 | 4 |
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5 This library is SDL_free software; you can redistribute it and/or |
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6 modify it under the terms of the GNU Lesser General Public |
0 | 7 License as published by the Free Software Foundation; either |
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8 version 2.1 of the License, or (at your option) any later version. |
0 | 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 | |
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13 Lesser General Public License for more details. |
0 | 14 |
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15 You should have received a copy of the GNU Lesser General Public |
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16 License along with this library; if not, write to the Free Software |
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17 Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA |
0 | 18 |
19 Sam Lantinga | |
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20 slouken@libsdl.org |
0 | 21 */ |
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22 #include "SDL_config.h" |
0 | 23 |
24 #ifndef _SDL_sysaudio_h | |
25 #define _SDL_sysaudio_h | |
26 | |
27 #include "SDL_mutex.h" | |
28 #include "SDL_thread.h" | |
29 | |
30 /* The SDL audio driver */ | |
31 typedef struct SDL_AudioDevice SDL_AudioDevice; | |
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32 #define _THIS SDL_AudioDevice *_this |
0 | 33 |
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34 typedef struct SDL_AudioDriverImpl |
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35 { |
2060 | 36 int (*DetectDevices) (int iscapture); |
37 const char *(*GetDeviceName) (int index, int iscapture); | |
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38 int (*OpenDevice) (_THIS, const char *devname, int iscapture); |
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39 void (*ThreadInit) (_THIS); /* Called by audio thread at start */ |
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40 void (*WaitDevice) (_THIS); |
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41 void (*PlayDevice) (_THIS); |
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42 Uint8 *(*GetDeviceBuf) (_THIS); |
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43 void (*WaitDone) (_THIS); |
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44 void (*CloseDevice) (_THIS); |
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45 void (*LockDevice) (_THIS); |
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46 void (*UnlockDevice) (_THIS); |
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47 void (*Deinitialize) (void); |
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48 |
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49 /* Some flags to push duplicate code into the core and reduce #ifdefs. */ |
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50 int ProvidesOwnCallbackThread:1; |
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51 int SkipMixerLock:1; |
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52 int HasCaptureSupport:1; |
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53 int OnlyHasDefaultOutputDevice:1; |
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54 int OnlyHasDefaultInputDevice:1; |
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55 } SDL_AudioDriverImpl; |
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56 |
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57 |
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58 typedef struct SDL_AudioDriver |
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59 { |
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60 /* * * */ |
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61 /* The name of this audio driver */ |
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62 const char *name; |
0 | 63 |
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64 /* * * */ |
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65 /* The description of this audio driver */ |
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66 const char *desc; |
0 | 67 |
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68 SDL_AudioDriverImpl impl; |
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69 } SDL_AudioDriver; |
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70 |
0 | 71 |
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72 /* Streamer */ |
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73 typedef struct |
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74 { |
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75 Uint8 *buffer; |
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76 int max_len; /* the maximum length in bytes */ |
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77 int read_pos, write_pos; /* the position of the write and read heads in bytes */ |
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78 } SDL_AudioStreamer; |
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79 |
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80 |
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81 /* Define the SDL audio driver structure */ |
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82 struct SDL_AudioDevice |
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83 { |
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84 /* * * */ |
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85 /* Data common to all devices */ |
0 | 86 |
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87 /* The current audio specification (shared with audio thread) */ |
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88 SDL_AudioSpec spec; |
0 | 89 |
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90 /* An audio conversion block for audio format emulation */ |
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91 SDL_AudioCVT convert; |
0 | 92 |
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93 /* The streamer, if sample rate conversion necessitates it */ |
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94 int use_streamer; |
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95 SDL_AudioStreamer streamer; |
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96 |
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97 /* Current state flags */ |
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98 int iscapture; |
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99 int enabled; |
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100 int paused; |
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101 int opened; |
0 | 102 |
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103 /* Fake audio buffer for when the audio hardware is busy */ |
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104 Uint8 *fake_stream; |
0 | 105 |
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106 /* A semaphore for locking the mixing buffers */ |
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107 SDL_mutex *mixer_lock; |
0 | 108 |
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109 /* A thread to feed the audio device */ |
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110 SDL_Thread *thread; |
3578 | 111 SDL_threadID threadid; |
0 | 112 |
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113 /* * * */ |
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114 /* Data private to this driver */ |
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115 struct SDL_PrivateAudioData *hidden; |
0 | 116 }; |
117 #undef _THIS | |
118 | |
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119 typedef struct AudioBootStrap |
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120 { |
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121 const char *name; |
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122 const char *desc; |
2060 | 123 int (*init) (SDL_AudioDriverImpl * impl); |
124 int demand_only:1; /* 1==request explicitly, or it won't be available. */ | |
0 | 125 } AudioBootStrap; |
126 | |
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127 #endif /* _SDL_sysaudio_h */ |
0 | 128 |
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129 /* vi: set ts=4 sw=4 expandtab: */ |