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Diffstat (limited to 'al/state.cpp')
| -rw-r--r-- | al/state.cpp | 859 |
1 files changed, 859 insertions, 0 deletions
diff --git a/al/state.cpp b/al/state.cpp new file mode 100644 index 00000000..cbb43685 --- /dev/null +++ b/al/state.cpp @@ -0,0 +1,859 @@ +/** + * OpenAL cross platform audio library + * Copyright (C) 1999-2000 by authors. + * This library is free software; you can redistribute it and/or + * modify it under the terms of the GNU Library General Public + * License as published by the Free Software Foundation; either + * version 2 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 + * Library General Public License for more details. + * + * You should have received a copy of the GNU Library General Public + * License along with this library; if not, write to the + * Free Software Foundation, Inc., + * 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA. + * Or go to http://www.gnu.org/copyleft/lgpl.html + */ + +#include "config.h" + +#include "version.h" + +#include <atomic> +#include <cmath> +#include <cstdlib> +#include <cstring> +#include <mutex> + +#include "AL/al.h" +#include "AL/alc.h" +#include "AL/alext.h" + +#include "alcontext.h" +#include "alexcpt.h" +#include "almalloc.h" +#include "alspan.h" +#include "alu.h" +#include "atomic.h" +#include "error.h" +#include "event.h" +#include "inprogext.h" +#include "opthelpers.h" + + +namespace { + +constexpr ALchar alVendor[] = "OpenAL Community"; +constexpr ALchar alVersion[] = "1.1 ALSOFT " ALSOFT_VERSION; +constexpr ALchar alRenderer[] = "OpenAL Soft"; + +// Error Messages +constexpr ALchar alNoError[] = "No Error"; +constexpr ALchar alErrInvalidName[] = "Invalid Name"; +constexpr ALchar alErrInvalidEnum[] = "Invalid Enum"; +constexpr ALchar alErrInvalidValue[] = "Invalid Value"; +constexpr ALchar alErrInvalidOp[] = "Invalid Operation"; +constexpr ALchar alErrOutOfMemory[] = "Out of Memory"; + +/* Resampler strings */ +constexpr ALchar alPointResampler[] = "Nearest"; +constexpr ALchar alLinearResampler[] = "Linear"; +constexpr ALchar alCubicResampler[] = "Cubic"; +constexpr ALchar alBSinc12Resampler[] = "11th order Sinc"; +constexpr ALchar alBSinc24Resampler[] = "23rd order Sinc"; + +} // namespace + +/* WARNING: Non-standard export! Not part of any extension, or exposed in the + * alcFunctions list. + */ +extern "C" AL_API const ALchar* AL_APIENTRY alsoft_get_version(void) +START_API_FUNC +{ + const char *spoof{getenv("ALSOFT_SPOOF_VERSION")}; + if(spoof && spoof[0] != '\0') return spoof; + return ALSOFT_VERSION; +} +END_API_FUNC + +#define DO_UPDATEPROPS() do { \ + if(!context->DeferUpdates.load(std::memory_order_acquire)) \ + UpdateContextProps(context.get()); \ + else \ + context->PropsClean.clear(std::memory_order_release); \ +} while(0) + + +AL_API ALvoid AL_APIENTRY alEnable(ALenum capability) +START_API_FUNC +{ + ContextRef context{GetContextRef()}; + if(UNLIKELY(!context)) return; + + std::lock_guard<std::mutex> _{context->PropLock}; + switch(capability) + { + case AL_SOURCE_DISTANCE_MODEL: + context->SourceDistanceModel = AL_TRUE; + DO_UPDATEPROPS(); + break; + + default: + alSetError(context.get(), AL_INVALID_VALUE, "Invalid enable property 0x%04x", capability); + } +} +END_API_FUNC + +AL_API ALvoid AL_APIENTRY alDisable(ALenum capability) +START_API_FUNC +{ + ContextRef context{GetContextRef()}; + if(UNLIKELY(!context)) return; + + std::lock_guard<std::mutex> _{context->PropLock}; + switch(capability) + { + case AL_SOURCE_DISTANCE_MODEL: + context->SourceDistanceModel = AL_FALSE; + DO_UPDATEPROPS(); + break; + + default: + alSetError(context.get(), AL_INVALID_VALUE, "Invalid disable property 0x%04x", capability); + } +} +END_API_FUNC + +AL_API ALboolean AL_APIENTRY alIsEnabled(ALenum capability) +START_API_FUNC +{ + ContextRef context{GetContextRef()}; + if(UNLIKELY(!context)) return AL_FALSE; + + std::lock_guard<std::mutex> _{context->PropLock}; + ALboolean value{AL_FALSE}; + switch(capability) + { + case AL_SOURCE_DISTANCE_MODEL: + value = context->SourceDistanceModel; + break; + + default: + alSetError(context.get(), AL_INVALID_VALUE, "Invalid is enabled property 0x%04x", capability); + } + + return value; +} +END_API_FUNC + +AL_API ALboolean AL_APIENTRY alGetBoolean(ALenum pname) +START_API_FUNC +{ + ContextRef context{GetContextRef()}; + if(UNLIKELY(!context)) return AL_FALSE; + + std::lock_guard<std::mutex> _{context->PropLock}; + ALboolean value{AL_FALSE}; + switch(pname) + { + case AL_DOPPLER_FACTOR: + if(context->DopplerFactor != 0.0f) + value = AL_TRUE; + break; + + case AL_DOPPLER_VELOCITY: + if(context->DopplerVelocity != 0.0f) + value = AL_TRUE; + break; + + case AL_DISTANCE_MODEL: + if(context->mDistanceModel == DistanceModel::Default) + value = AL_TRUE; + break; + + case AL_SPEED_OF_SOUND: + if(context->SpeedOfSound != 0.0f) + value = AL_TRUE; + break; + + case AL_DEFERRED_UPDATES_SOFT: + if(context->DeferUpdates.load(std::memory_order_acquire)) + value = AL_TRUE; + break; + + case AL_GAIN_LIMIT_SOFT: + if(GAIN_MIX_MAX/context->GainBoost != 0.0f) + value = AL_TRUE; + break; + + case AL_NUM_RESAMPLERS_SOFT: + /* Always non-0. */ + value = AL_TRUE; + break; + + case AL_DEFAULT_RESAMPLER_SOFT: + value = ResamplerDefault ? AL_TRUE : AL_FALSE; + break; + + default: + alSetError(context.get(), AL_INVALID_VALUE, "Invalid boolean property 0x%04x", pname); + } + + return value; +} +END_API_FUNC + +AL_API ALdouble AL_APIENTRY alGetDouble(ALenum pname) +START_API_FUNC +{ + ContextRef context{GetContextRef()}; + if(UNLIKELY(!context)) return 0.0; + + std::lock_guard<std::mutex> _{context->PropLock}; + ALdouble value{0.0}; + switch(pname) + { + case AL_DOPPLER_FACTOR: + value = static_cast<ALdouble>(context->DopplerFactor); + break; + + case AL_DOPPLER_VELOCITY: + value = static_cast<ALdouble>(context->DopplerVelocity); + break; + + case AL_DISTANCE_MODEL: + value = static_cast<ALdouble>(context->mDistanceModel); + break; + + case AL_SPEED_OF_SOUND: + value = static_cast<ALdouble>(context->SpeedOfSound); + break; + + case AL_DEFERRED_UPDATES_SOFT: + if(context->DeferUpdates.load(std::memory_order_acquire)) + value = static_cast<ALdouble>(AL_TRUE); + break; + + case AL_GAIN_LIMIT_SOFT: + value = static_cast<ALdouble>GAIN_MIX_MAX/context->GainBoost; + break; + + case AL_NUM_RESAMPLERS_SOFT: + value = static_cast<ALdouble>(ResamplerMax + 1); + break; + + case AL_DEFAULT_RESAMPLER_SOFT: + value = static_cast<ALdouble>(ResamplerDefault); + break; + + default: + alSetError(context.get(), AL_INVALID_VALUE, "Invalid double property 0x%04x", pname); + } + + return value; +} +END_API_FUNC + +AL_API ALfloat AL_APIENTRY alGetFloat(ALenum pname) +START_API_FUNC +{ + ContextRef context{GetContextRef()}; + if(UNLIKELY(!context)) return 0.0f; + + std::lock_guard<std::mutex> _{context->PropLock}; + ALfloat value{0.0f}; + switch(pname) + { + case AL_DOPPLER_FACTOR: + value = context->DopplerFactor; + break; + + case AL_DOPPLER_VELOCITY: + value = context->DopplerVelocity; + break; + + case AL_DISTANCE_MODEL: + value = static_cast<ALfloat>(context->mDistanceModel); + break; + + case AL_SPEED_OF_SOUND: + value = context->SpeedOfSound; + break; + + case AL_DEFERRED_UPDATES_SOFT: + if(context->DeferUpdates.load(std::memory_order_acquire)) + value = static_cast<ALfloat>(AL_TRUE); + break; + + case AL_GAIN_LIMIT_SOFT: + value = GAIN_MIX_MAX/context->GainBoost; + break; + + case AL_NUM_RESAMPLERS_SOFT: + value = static_cast<ALfloat>(ResamplerMax + 1); + break; + + case AL_DEFAULT_RESAMPLER_SOFT: + value = static_cast<ALfloat>(ResamplerDefault); + break; + + default: + alSetError(context.get(), AL_INVALID_VALUE, "Invalid float property 0x%04x", pname); + } + + return value; +} +END_API_FUNC + +AL_API ALint AL_APIENTRY alGetInteger(ALenum pname) +START_API_FUNC +{ + ContextRef context{GetContextRef()}; + if(UNLIKELY(!context)) return 0; + + std::lock_guard<std::mutex> _{context->PropLock}; + ALint value{0}; + switch(pname) + { + case AL_DOPPLER_FACTOR: + value = static_cast<ALint>(context->DopplerFactor); + break; + + case AL_DOPPLER_VELOCITY: + value = static_cast<ALint>(context->DopplerVelocity); + break; + + case AL_DISTANCE_MODEL: + value = static_cast<ALint>(context->mDistanceModel); + break; + + case AL_SPEED_OF_SOUND: + value = static_cast<ALint>(context->SpeedOfSound); + break; + + case AL_DEFERRED_UPDATES_SOFT: + if(context->DeferUpdates.load(std::memory_order_acquire)) + value = static_cast<ALint>(AL_TRUE); + break; + + case AL_GAIN_LIMIT_SOFT: + value = static_cast<ALint>(GAIN_MIX_MAX/context->GainBoost); + break; + + case AL_NUM_RESAMPLERS_SOFT: + value = ResamplerMax + 1; + break; + + case AL_DEFAULT_RESAMPLER_SOFT: + value = ResamplerDefault; + break; + + default: + alSetError(context.get(), AL_INVALID_VALUE, "Invalid integer property 0x%04x", pname); + } + + return value; +} +END_API_FUNC + +extern "C" AL_API ALint64SOFT AL_APIENTRY alGetInteger64SOFT(ALenum pname) +START_API_FUNC +{ + ContextRef context{GetContextRef()}; + if(UNLIKELY(!context)) return 0; + + std::lock_guard<std::mutex> _{context->PropLock}; + ALint64SOFT value{0}; + switch(pname) + { + case AL_DOPPLER_FACTOR: + value = (ALint64SOFT)context->DopplerFactor; + break; + + case AL_DOPPLER_VELOCITY: + value = (ALint64SOFT)context->DopplerVelocity; + break; + + case AL_DISTANCE_MODEL: + value = (ALint64SOFT)context->mDistanceModel; + break; + + case AL_SPEED_OF_SOUND: + value = (ALint64SOFT)context->SpeedOfSound; + break; + + case AL_DEFERRED_UPDATES_SOFT: + if(context->DeferUpdates.load(std::memory_order_acquire)) + value = (ALint64SOFT)AL_TRUE; + break; + + case AL_GAIN_LIMIT_SOFT: + value = (ALint64SOFT)(GAIN_MIX_MAX/context->GainBoost); + break; + + case AL_NUM_RESAMPLERS_SOFT: + value = (ALint64SOFT)(ResamplerMax + 1); + break; + + case AL_DEFAULT_RESAMPLER_SOFT: + value = (ALint64SOFT)ResamplerDefault; + break; + + default: + alSetError(context.get(), AL_INVALID_VALUE, "Invalid integer64 property 0x%04x", pname); + } + + return value; +} +END_API_FUNC + +AL_API void* AL_APIENTRY alGetPointerSOFT(ALenum pname) +START_API_FUNC +{ + ContextRef context{GetContextRef()}; + if(UNLIKELY(!context)) return nullptr; + + std::lock_guard<std::mutex> _{context->PropLock}; + void *value{nullptr}; + switch(pname) + { + case AL_EVENT_CALLBACK_FUNCTION_SOFT: + value = reinterpret_cast<void*>(context->EventCb); + break; + + case AL_EVENT_CALLBACK_USER_PARAM_SOFT: + value = context->EventParam; + break; + + default: + alSetError(context.get(), AL_INVALID_VALUE, "Invalid pointer property 0x%04x", pname); + } + + return value; +} +END_API_FUNC + +AL_API ALvoid AL_APIENTRY alGetBooleanv(ALenum pname, ALboolean *values) +START_API_FUNC +{ + if(values) + { + switch(pname) + { + case AL_DOPPLER_FACTOR: + case AL_DOPPLER_VELOCITY: + case AL_DISTANCE_MODEL: + case AL_SPEED_OF_SOUND: + case AL_DEFERRED_UPDATES_SOFT: + case AL_GAIN_LIMIT_SOFT: + case AL_NUM_RESAMPLERS_SOFT: + case AL_DEFAULT_RESAMPLER_SOFT: + values[0] = alGetBoolean(pname); + return; + } + } + + ContextRef context{GetContextRef()}; + if(UNLIKELY(!context)) return; + + if(!values) + alSetError(context.get(), AL_INVALID_VALUE, "NULL pointer"); + else switch(pname) + { + default: + alSetError(context.get(), AL_INVALID_VALUE, "Invalid boolean-vector property 0x%04x", pname); + } +} +END_API_FUNC + +AL_API ALvoid AL_APIENTRY alGetDoublev(ALenum pname, ALdouble *values) +START_API_FUNC +{ + if(values) + { + switch(pname) + { + case AL_DOPPLER_FACTOR: + case AL_DOPPLER_VELOCITY: + case AL_DISTANCE_MODEL: + case AL_SPEED_OF_SOUND: + case AL_DEFERRED_UPDATES_SOFT: + case AL_GAIN_LIMIT_SOFT: + case AL_NUM_RESAMPLERS_SOFT: + case AL_DEFAULT_RESAMPLER_SOFT: + values[0] = alGetDouble(pname); + return; + } + } + + ContextRef context{GetContextRef()}; + if(UNLIKELY(!context)) return; + + if(!values) + alSetError(context.get(), AL_INVALID_VALUE, "NULL pointer"); + else switch(pname) + { + default: + alSetError(context.get(), AL_INVALID_VALUE, "Invalid double-vector property 0x%04x", pname); + } +} +END_API_FUNC + +AL_API ALvoid AL_APIENTRY alGetFloatv(ALenum pname, ALfloat *values) +START_API_FUNC +{ + if(values) + { + switch(pname) + { + case AL_DOPPLER_FACTOR: + case AL_DOPPLER_VELOCITY: + case AL_DISTANCE_MODEL: + case AL_SPEED_OF_SOUND: + case AL_DEFERRED_UPDATES_SOFT: + case AL_GAIN_LIMIT_SOFT: + case AL_NUM_RESAMPLERS_SOFT: + case AL_DEFAULT_RESAMPLER_SOFT: + values[0] = alGetFloat(pname); + return; + } + } + + ContextRef context{GetContextRef()}; + if(UNLIKELY(!context)) return; + + if(!values) + alSetError(context.get(), AL_INVALID_VALUE, "NULL pointer"); + else switch(pname) + { + default: + alSetError(context.get(), AL_INVALID_VALUE, "Invalid float-vector property 0x%04x", pname); + } +} +END_API_FUNC + +AL_API ALvoid AL_APIENTRY alGetIntegerv(ALenum pname, ALint *values) +START_API_FUNC +{ + if(values) + { + switch(pname) + { + case AL_DOPPLER_FACTOR: + case AL_DOPPLER_VELOCITY: + case AL_DISTANCE_MODEL: + case AL_SPEED_OF_SOUND: + case AL_DEFERRED_UPDATES_SOFT: + case AL_GAIN_LIMIT_SOFT: + case AL_NUM_RESAMPLERS_SOFT: + case AL_DEFAULT_RESAMPLER_SOFT: + values[0] = alGetInteger(pname); + return; + } + } + + ContextRef context{GetContextRef()}; + if(UNLIKELY(!context)) return; + + if(!values) + alSetError(context.get(), AL_INVALID_VALUE, "NULL pointer"); + else switch(pname) + { + default: + alSetError(context.get(), AL_INVALID_VALUE, "Invalid integer-vector property 0x%04x", pname); + } +} +END_API_FUNC + +extern "C" AL_API void AL_APIENTRY alGetInteger64vSOFT(ALenum pname, ALint64SOFT *values) +START_API_FUNC +{ + if(values) + { + switch(pname) + { + case AL_DOPPLER_FACTOR: + case AL_DOPPLER_VELOCITY: + case AL_DISTANCE_MODEL: + case AL_SPEED_OF_SOUND: + case AL_DEFERRED_UPDATES_SOFT: + case AL_GAIN_LIMIT_SOFT: + case AL_NUM_RESAMPLERS_SOFT: + case AL_DEFAULT_RESAMPLER_SOFT: + values[0] = alGetInteger64SOFT(pname); + return; + } + } + + ContextRef context{GetContextRef()}; + if(UNLIKELY(!context)) return; + + if(!values) + alSetError(context.get(), AL_INVALID_VALUE, "NULL pointer"); + else switch(pname) + { + default: + alSetError(context.get(), AL_INVALID_VALUE, "Invalid integer64-vector property 0x%04x", pname); + } +} +END_API_FUNC + +AL_API void AL_APIENTRY alGetPointervSOFT(ALenum pname, void **values) +START_API_FUNC +{ + if(values) + { + switch(pname) + { + case AL_EVENT_CALLBACK_FUNCTION_SOFT: + case AL_EVENT_CALLBACK_USER_PARAM_SOFT: + values[0] = alGetPointerSOFT(pname); + return; + } + } + + ContextRef context{GetContextRef()}; + if(UNLIKELY(!context)) return; + + if(!values) + alSetError(context.get(), AL_INVALID_VALUE, "NULL pointer"); + else switch(pname) + { + default: + alSetError(context.get(), AL_INVALID_VALUE, "Invalid pointer-vector property 0x%04x", pname); + } +} +END_API_FUNC + +AL_API const ALchar* AL_APIENTRY alGetString(ALenum pname) +START_API_FUNC +{ + ContextRef context{GetContextRef()}; + if(UNLIKELY(!context)) return nullptr; + + const ALchar *value{nullptr}; + switch(pname) + { + case AL_VENDOR: + value = alVendor; + break; + + case AL_VERSION: + value = alVersion; + break; + + case AL_RENDERER: + value = alRenderer; + break; + + case AL_EXTENSIONS: + value = context->ExtensionList; + break; + + case AL_NO_ERROR: + value = alNoError; + break; + + case AL_INVALID_NAME: + value = alErrInvalidName; + break; + + case AL_INVALID_ENUM: + value = alErrInvalidEnum; + break; + + case AL_INVALID_VALUE: + value = alErrInvalidValue; + break; + + case AL_INVALID_OPERATION: + value = alErrInvalidOp; + break; + + case AL_OUT_OF_MEMORY: + value = alErrOutOfMemory; + break; + + default: + alSetError(context.get(), AL_INVALID_VALUE, "Invalid string property 0x%04x", pname); + } + return value; +} +END_API_FUNC + +AL_API ALvoid AL_APIENTRY alDopplerFactor(ALfloat value) +START_API_FUNC +{ + ContextRef context{GetContextRef()}; + if(UNLIKELY(!context)) return; + + if(!(value >= 0.0f && std::isfinite(value))) + alSetError(context.get(), AL_INVALID_VALUE, "Doppler factor %f out of range", value); + else + { + std::lock_guard<std::mutex> _{context->PropLock}; + context->DopplerFactor = value; + DO_UPDATEPROPS(); + } +} +END_API_FUNC + +AL_API ALvoid AL_APIENTRY alDopplerVelocity(ALfloat value) +START_API_FUNC +{ + ContextRef context{GetContextRef()}; + if(UNLIKELY(!context)) return; + + if((context->EnabledEvts.load(std::memory_order_relaxed)&EventType_Deprecated)) + { + static constexpr ALCchar msg[] = + "alDopplerVelocity is deprecated in AL1.1, use alSpeedOfSound"; + const ALsizei msglen = static_cast<ALsizei>(strlen(msg)); + std::lock_guard<std::mutex> _{context->EventCbLock}; + ALbitfieldSOFT enabledevts{context->EnabledEvts.load(std::memory_order_relaxed)}; + if((enabledevts&EventType_Deprecated) && context->EventCb) + (*context->EventCb)(AL_EVENT_TYPE_DEPRECATED_SOFT, 0, 0, msglen, msg, + context->EventParam); + } + + if(!(value >= 0.0f && std::isfinite(value))) + alSetError(context.get(), AL_INVALID_VALUE, "Doppler velocity %f out of range", value); + else + { + std::lock_guard<std::mutex> _{context->PropLock}; + context->DopplerVelocity = value; + DO_UPDATEPROPS(); + } +} +END_API_FUNC + +AL_API ALvoid AL_APIENTRY alSpeedOfSound(ALfloat value) +START_API_FUNC +{ + ContextRef context{GetContextRef()}; + if(UNLIKELY(!context)) return; + + if(!(value > 0.0f && std::isfinite(value))) + alSetError(context.get(), AL_INVALID_VALUE, "Speed of sound %f out of range", value); + else + { + std::lock_guard<std::mutex> _{context->PropLock}; + context->SpeedOfSound = value; + DO_UPDATEPROPS(); + } +} +END_API_FUNC + +AL_API ALvoid AL_APIENTRY alDistanceModel(ALenum value) +START_API_FUNC +{ + ContextRef context{GetContextRef()}; + if(UNLIKELY(!context)) return; + + if(!(value == AL_INVERSE_DISTANCE || value == AL_INVERSE_DISTANCE_CLAMPED || + value == AL_LINEAR_DISTANCE || value == AL_LINEAR_DISTANCE_CLAMPED || + value == AL_EXPONENT_DISTANCE || value == AL_EXPONENT_DISTANCE_CLAMPED || + value == AL_NONE)) + alSetError(context.get(), AL_INVALID_VALUE, "Distance model 0x%04x out of range", value); + else + { + std::lock_guard<std::mutex> _{context->PropLock}; + context->mDistanceModel = static_cast<DistanceModel>(value); + if(!context->SourceDistanceModel) + DO_UPDATEPROPS(); + } +} +END_API_FUNC + + +AL_API ALvoid AL_APIENTRY alDeferUpdatesSOFT(void) +START_API_FUNC +{ + ContextRef context{GetContextRef()}; + if(UNLIKELY(!context)) return; + + ALCcontext_DeferUpdates(context.get()); +} +END_API_FUNC + +AL_API ALvoid AL_APIENTRY alProcessUpdatesSOFT(void) +START_API_FUNC +{ + ContextRef context{GetContextRef()}; + if(UNLIKELY(!context)) return; + + ALCcontext_ProcessUpdates(context.get()); +} +END_API_FUNC + + +AL_API const ALchar* AL_APIENTRY alGetStringiSOFT(ALenum pname, ALsizei index) +START_API_FUNC +{ + const char *ResamplerNames[] = { + alPointResampler, alLinearResampler, + alCubicResampler, alBSinc12Resampler, + alBSinc24Resampler, + }; + static_assert(al::size(ResamplerNames) == ResamplerMax+1, "Incorrect ResamplerNames list"); + + ContextRef context{GetContextRef()}; + if(UNLIKELY(!context)) return nullptr; + + const ALchar *value{nullptr}; + switch(pname) + { + case AL_RESAMPLER_NAME_SOFT: + if(index < 0 || static_cast<size_t>(index) >= al::size(ResamplerNames)) + alSetError(context.get(), AL_INVALID_VALUE, "Resampler name index %d out of range", + index); + else + value = ResamplerNames[index]; + break; + + default: + alSetError(context.get(), AL_INVALID_VALUE, "Invalid string indexed property"); + } + return value; +} +END_API_FUNC + + +void UpdateContextProps(ALCcontext *context) +{ + /* Get an unused proprty container, or allocate a new one as needed. */ + ALcontextProps *props{context->FreeContextProps.load(std::memory_order_acquire)}; + if(!props) + props = static_cast<ALcontextProps*>(al_calloc(16, sizeof(*props))); + else + { + ALcontextProps *next; + do { + next = props->next.load(std::memory_order_relaxed); + } while(context->FreeContextProps.compare_exchange_weak(props, next, + std::memory_order_seq_cst, std::memory_order_acquire) == 0); + } + + /* Copy in current property values. */ + props->MetersPerUnit = context->MetersPerUnit; + + props->DopplerFactor = context->DopplerFactor; + props->DopplerVelocity = context->DopplerVelocity; + props->SpeedOfSound = context->SpeedOfSound; + + props->SourceDistanceModel = context->SourceDistanceModel; + props->mDistanceModel = context->mDistanceModel; + + /* Set the new container for updating internal parameters. */ + props = context->Update.exchange(props, std::memory_order_acq_rel); + if(props) + { + /* If there was an unused update container, put it back in the + * freelist. + */ + AtomicReplaceHead(context->FreeContextProps, props); + } +} |