Mercurial > sdl-ios-xcode
view src/audio/nas/SDL_nasaudio.c @ 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 | 4160ba33b597 |
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 This driver was written by: Erik Inge Bolsų knan@mo.himolde.no */ #include "SDL_config.h" /* Allow access to a raw mixing buffer */ #include <signal.h> #include <unistd.h> #include "SDL_timer.h" #include "SDL_audio.h" #include "SDL_loadso.h" #include "../SDL_audiomem.h" #include "../SDL_audio_c.h" #include "SDL_nasaudio.h" /* The tag name used by nas audio */ #define NAS_DRIVER_NAME "nas" static struct SDL_PrivateAudioData *this2 = NULL; static void (*NAS_AuCloseServer) (AuServer *); static void (*NAS_AuNextEvent) (AuServer *, AuBool, AuEvent *); static AuBool(*NAS_AuDispatchEvent) (AuServer *, AuEvent *); static AuFlowID(*NAS_AuCreateFlow) (AuServer *, AuStatus *); static void (*NAS_AuStartFlow) (AuServer *, AuFlowID, AuStatus *); static void (*NAS_AuSetElements) (AuServer *, AuFlowID, AuBool, int, AuElement *, AuStatus *); static void (*NAS_AuWriteElement) (AuServer *, AuFlowID, int, AuUint32, AuPointer, AuBool, AuStatus *); static AuServer *(*NAS_AuOpenServer) (_AuConst char *, int, _AuConst char *, int, _AuConst char *, char **); static AuEventHandlerRec *(*NAS_AuRegisterEventHandler) (AuServer *, AuMask, int, AuID, AuEventHandlerCallback, AuPointer); #ifdef SDL_AUDIO_DRIVER_NAS_DYNAMIC static const char *nas_library = SDL_AUDIO_DRIVER_NAS_DYNAMIC; static void *nas_handle = NULL; static int load_nas_sym(const char *fn, void **addr) { *addr = SDL_LoadFunction(nas_handle, fn); if (*addr == NULL) { return 0; } return 1; } /* cast funcs to char* first, to please GCC's strict aliasing rules. */ #define SDL_NAS_SYM(x) \ if (!load_nas_sym(#x, (void **) (char *) &NAS_##x)) return -1 #else #define SDL_NAS_SYM(x) NAS_##x = x #endif static int load_nas_syms(void) { SDL_NAS_SYM(AuCloseServer); SDL_NAS_SYM(AuNextEvent); SDL_NAS_SYM(AuDispatchEvent); SDL_NAS_SYM(AuCreateFlow); SDL_NAS_SYM(AuStartFlow); SDL_NAS_SYM(AuSetElements); SDL_NAS_SYM(AuWriteElement); SDL_NAS_SYM(AuOpenServer); SDL_NAS_SYM(AuRegisterEventHandler); return 0; } #undef SDL_NAS_SYM #ifdef SDL_AUDIO_DRIVER_NAS_DYNAMIC static void UnloadNASLibrary(void) { if (nas_handle != NULL) { SDL_UnloadObject(nas_handle); nas_handle = NULL; } } static int LoadNASLibrary(void) { int retval = 0; if (nas_handle == NULL) { nas_handle = SDL_LoadObject(nas_library); if (nas_handle == NULL) { /* Copy error string so we can use it in a new SDL_SetError(). */ char *origerr = SDL_GetError(); size_t len = SDL_strlen(origerr) + 1; char *err = (char *) alloca(len); SDL_strlcpy(err, origerr, len); retval = -1; SDL_SetError("NAS: SDL_LoadObject('%s') failed: %s\n", nas_library, err); } else { retval = load_nas_syms(); if (retval < 0) { UnloadNASLibrary(); } } } return retval; } #else static void UnloadNASLibrary(void) { } static int LoadNASLibrary(void) { load_nas_syms(); return 0; } #endif /* SDL_AUDIO_DRIVER_NAS_DYNAMIC */ /* This function waits until it is possible to write a full sound buffer */ static void NAS_WaitDevice(_THIS) { while (this->hidden->buf_free < this->hidden->mixlen) { AuEvent ev; NAS_AuNextEvent(this->hidden->aud, AuTrue, &ev); NAS_AuDispatchEvent(this->hidden->aud, &ev); } } static void NAS_PlayDevice(_THIS) { while (this->hidden->mixlen > this->hidden->buf_free) { /* * We think the buffer is full? Yikes! Ask the server for events, * in the hope that some of them is LowWater events telling us more * of the buffer is free now than what we think. */ AuEvent ev; NAS_AuNextEvent(this->hidden->aud, AuTrue, &ev); NAS_AuDispatchEvent(this->hidden->aud, &ev); } this->hidden->buf_free -= this->hidden->mixlen; /* Write the audio data */ NAS_AuWriteElement(this->hidden->aud, this->hidden->flow, 0, this->hidden->mixlen, this->hidden->mixbuf, AuFalse, NULL); this->hidden->written += this->hidden->mixlen; #ifdef DEBUG_AUDIO fprintf(stderr, "Wrote %d bytes of audio data\n", this->hidden->mixlen); #endif } static Uint8 * NAS_GetDeviceBuf(_THIS) { return (this->hidden->mixbuf); } static void NAS_CloseDevice(_THIS) { if (this->hidden != NULL) { if (this->hidden->mixbuf != NULL) { SDL_FreeAudioMem(this->hidden->mixbuf); this->hidden->mixbuf = NULL; } if (this->hidden->aud) { NAS_AuCloseServer(this->hidden->aud); this->hidden->aud = 0; } SDL_free(this->hidden); this2 = this->hidden = NULL; } } static unsigned char sdlformat_to_auformat(unsigned int fmt) { switch (fmt) { case AUDIO_U8: return AuFormatLinearUnsigned8; case AUDIO_S8: return AuFormatLinearSigned8; case AUDIO_U16LSB: return AuFormatLinearUnsigned16LSB; case AUDIO_U16MSB: return AuFormatLinearUnsigned16MSB; case AUDIO_S16LSB: return AuFormatLinearSigned16LSB; case AUDIO_S16MSB: return AuFormatLinearSigned16MSB; } return AuNone; } static AuBool event_handler(AuServer * aud, AuEvent * ev, AuEventHandlerRec * hnd) { switch (ev->type) { case AuEventTypeElementNotify: { AuElementNotifyEvent *event = (AuElementNotifyEvent *) ev; switch (event->kind) { case AuElementNotifyKindLowWater: if (this2->buf_free >= 0) { this2->really += event->num_bytes; gettimeofday(&this2->last_tv, 0); this2->buf_free += event->num_bytes; } else { this2->buf_free = event->num_bytes; } break; case AuElementNotifyKindState: switch (event->cur_state) { case AuStatePause: if (event->reason != AuReasonUser) { if (this2->buf_free >= 0) { this2->really += event->num_bytes; gettimeofday(&this2->last_tv, 0); this2->buf_free += event->num_bytes; } else { this2->buf_free = event->num_bytes; } } break; } } } } return AuTrue; } static AuDeviceID find_device(_THIS, int nch) { /* These "Au" things are all macros, not functions... */ int i; for (i = 0; i < AuServerNumDevices(this->hidden->aud); i++) { if ((AuDeviceKind(AuServerDevice(this->hidden->aud, i)) == AuComponentKindPhysicalOutput) && AuDeviceNumTracks(AuServerDevice(this->hidden->aud, i)) == nch) { return AuDeviceIdentifier(AuServerDevice(this->hidden->aud, i)); } } return AuNone; } static int NAS_OpenDevice(_THIS, const char *devname, int iscapture) { AuElement elms[3]; int buffer_size; SDL_AudioFormat test_format, format; /* Initialize all variables that we clean on shutdown */ this->hidden = (struct SDL_PrivateAudioData *) SDL_malloc((sizeof *this->hidden)); if (this->hidden == NULL) { SDL_OutOfMemory(); return 0; } SDL_memset(this->hidden, 0, (sizeof *this->hidden)); /* Try for a closest match on audio format */ format = 0; for (test_format = SDL_FirstAudioFormat(this->spec.format); !format && test_format;) { format = sdlformat_to_auformat(test_format); if (format == AuNone) { test_format = SDL_NextAudioFormat(); } } if (format == 0) { NAS_CloseDevice(this); SDL_SetError("NAS: Couldn't find any hardware audio formats"); return 0; } this->spec.format = test_format; this->hidden->aud = NAS_AuOpenServer("", 0, NULL, 0, NULL, NULL); if (this->hidden->aud == 0) { NAS_CloseDevice(this); SDL_SetError("NAS: Couldn't open connection to NAS server"); return 0; } this->hidden->dev = find_device(this, this->spec.channels); if ((this->hidden->dev == AuNone) || (!(this->hidden->flow = NAS_AuCreateFlow(this->hidden->aud, 0)))) { NAS_CloseDevice(this); SDL_SetError("NAS: Couldn't find a fitting device on NAS server"); return 0; } buffer_size = this->spec.freq; if (buffer_size < 4096) buffer_size = 4096; if (buffer_size > 32768) buffer_size = 32768; /* So that the buffer won't get unmanageably big. */ /* Calculate the final parameters for this audio specification */ SDL_CalculateAudioSpec(&this->spec); this2 = this->hidden; AuMakeElementImportClient(elms, this->spec.freq, format, this->spec.channels, AuTrue, buffer_size, buffer_size / 4, 0, NULL); AuMakeElementExportDevice(elms + 1, 0, this->hidden->dev, this->spec.freq, AuUnlimitedSamples, 0, NULL); NAS_AuSetElements(this->hidden->aud, this->hidden->flow, AuTrue, 2, elms, NULL); NAS_AuRegisterEventHandler(this->hidden->aud, AuEventHandlerIDMask, 0, this->hidden->flow, event_handler, (AuPointer) NULL); NAS_AuStartFlow(this->hidden->aud, this->hidden->flow, NULL); /* Allocate mixing buffer */ this->hidden->mixlen = this->spec.size; this->hidden->mixbuf = (Uint8 *) SDL_AllocAudioMem(this->hidden->mixlen); if (this->hidden->mixbuf == NULL) { NAS_CloseDevice(this); SDL_OutOfMemory(); return 0; } SDL_memset(this->hidden->mixbuf, this->spec.silence, this->spec.size); /* We're ready to rock and roll. :-) */ return 1; } static void NAS_Deinitialize(void) { UnloadNASLibrary(); } static int NAS_Init(SDL_AudioDriverImpl * impl) { if (LoadNASLibrary() < 0) { return 0; } else { AuServer *aud = NAS_AuOpenServer("", 0, NULL, 0, NULL, NULL); if (aud == NULL) { SDL_SetError("NAS: AuOpenServer() failed (no audio server?)"); return 0; } NAS_AuCloseServer(aud); } /* Set the function pointers */ impl->OpenDevice = NAS_OpenDevice; impl->PlayDevice = NAS_PlayDevice; impl->WaitDevice = NAS_WaitDevice; impl->GetDeviceBuf = NAS_GetDeviceBuf; impl->CloseDevice = NAS_CloseDevice; impl->Deinitialize = NAS_Deinitialize; impl->OnlyHasDefaultOutputDevice = 1; /* !!! FIXME: is this true? */ return 1; /* this audio target is available. */ } AudioBootStrap NAS_bootstrap = { NAS_DRIVER_NAME, "Network Audio System", NAS_Init, 0 }; /* vi: set ts=4 sw=4 expandtab: */