godot/servers/audio/audio_driver_dummy.cpp
Pedro J. Estébanez 18fbdbb456 Reimplement Mutex with C++'s <mutex>
Main:
- It's now implemented thanks to `<mutex>`. No more platform-specific implementations.
- `BinaryMutex` (non-recursive) is added, as an alternative for special cases.
- Doesn't need allocation/deallocation anymore. It can live in the stack and be part of other classes.
- Because of that, it's methods are now `const` and the inner mutex is `mutable` so it can be easily used in `const` contexts.
- A no-op implementation is provided if `NO_THREADS` is defined. No more need to add `#ifdef NO_THREADS` just for this.
- `MutexLock` now takes a reference. At this point the cases of null `Mutex`es are rare. If you ever need that, just don't use `MutexLock`.
- Thread-safe utilities are therefore simpler now.

Misc.:
- `ScopedMutexLock` is dropped and replaced by `MutexLock`, because they were pretty much the same.
- Every case of lock, do-something, unlock is replaced by `MutexLock` (complex cases where it's not straightfoward are kept as as explicit lock and unlock).
- `ShaderRD` contained an `std::mutex`, which has been replaced by `Mutex`.
2020-02-26 20:40:10 +01:00

133 lines
3.8 KiB
C++

/*************************************************************************/
/* audio_driver_dummy.cpp */
/*************************************************************************/
/* This file is part of: */
/* GODOT ENGINE */
/* https://godotengine.org */
/*************************************************************************/
/* Copyright (c) 2007-2020 Juan Linietsky, Ariel Manzur. */
/* Copyright (c) 2014-2020 Godot Engine contributors (cf. AUTHORS.md). */
/* */
/* Permission is hereby granted, free of charge, to any person obtaining */
/* a copy of this software and associated documentation files (the */
/* "Software"), to deal in the Software without restriction, including */
/* without limitation the rights to use, copy, modify, merge, publish, */
/* distribute, sublicense, and/or sell copies of the Software, and to */
/* permit persons to whom the Software is furnished to do so, subject to */
/* the following conditions: */
/* */
/* The above copyright notice and this permission notice shall be */
/* included in all copies or substantial portions of the Software. */
/* */
/* THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, */
/* EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF */
/* MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT.*/
/* IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY */
/* CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN ACTION OF CONTRACT, */
/* TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN CONNECTION WITH THE */
/* SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE. */
/*************************************************************************/
#include "audio_driver_dummy.h"
#include "core/os/os.h"
#include "core/project_settings.h"
Error AudioDriverDummy::init() {
active = false;
thread_exited = false;
exit_thread = false;
samples_in = NULL;
mix_rate = DEFAULT_MIX_RATE;
speaker_mode = SPEAKER_MODE_STEREO;
channels = 2;
int latency = GLOBAL_DEF_RST("audio/output_latency", DEFAULT_OUTPUT_LATENCY);
buffer_frames = closest_power_of_2(latency * mix_rate / 1000);
samples_in = memnew_arr(int32_t, buffer_frames * channels);
thread = Thread::create(AudioDriverDummy::thread_func, this);
return OK;
};
void AudioDriverDummy::thread_func(void *p_udata) {
AudioDriverDummy *ad = (AudioDriverDummy *)p_udata;
uint64_t usdelay = (ad->buffer_frames / float(ad->mix_rate)) * 1000000;
while (!ad->exit_thread) {
if (ad->active) {
ad->lock();
ad->audio_server_process(ad->buffer_frames, ad->samples_in);
ad->unlock();
};
OS::get_singleton()->delay_usec(usdelay);
};
ad->thread_exited = true;
};
void AudioDriverDummy::start() {
active = true;
};
int AudioDriverDummy::get_mix_rate() const {
return mix_rate;
};
AudioDriver::SpeakerMode AudioDriverDummy::get_speaker_mode() const {
return speaker_mode;
};
void AudioDriverDummy::lock() {
if (!thread)
return;
mutex.lock();
};
void AudioDriverDummy::unlock() {
if (!thread)
return;
mutex.unlock();
};
void AudioDriverDummy::finish() {
if (!thread)
return;
exit_thread = true;
Thread::wait_to_finish(thread);
if (samples_in) {
memdelete_arr(samples_in);
};
memdelete(thread);
thread = NULL;
};
AudioDriverDummy::AudioDriverDummy() {
thread = NULL;
};
AudioDriverDummy::~AudioDriverDummy(){
};