int main(void) {
PlatformState state;
SDL_Event e;
SDL_Window *window;
SDL_Renderer *renderer;
SDLInputContext sdlIC;
SDLSoundRingBuffer srb;
GameSoundOutput sb;
GameMemory gameMemory;
//controller input state
InputContext inputStates[2]; //contains old and new state
InputContext* newInputState = &inputStates[0];
InputContext* oldInputState = &inputStates[1];
real32_t secsSinceLastFrame = 0;
sb.volume = 2500;
gameMemory.permanentStorageSize = MB(64);
gameMemory.transientStorageSize = MB(64);
state.gameMemorySize = gameMemory.transientStorageSize + gameMemory.permanentStorageSize;
state.memoryBlock = mmap(nullptr, state.gameMemorySize, PROT_READ | PROT_WRITE,
MAP_ANONYMOUS | MAP_PRIVATE ,
-1,
0);
gameMemory.permanentStorage = state.memoryBlock;
gameMemory.transientStorage = (uint8_t*)(gameMemory.transientStorage) + gameMemory.transientStorageSize;
initSDL(&window, &renderer, &gOsb, &sdlIC, &srb);
GameCode gameCode = loadGameCode();
assert(gameCode.guarf);
uint64_t startCount = SDL_GetPerformanceCounter();
real32_t targetFrameSeconds = 1./getRefreshRate(window);
SDL_PauseAudio(0);
while(state.running) {
if(getCreateTimeOfFile(GAME_LIB_PATH) != gameCode.dateLastModified) {
reloadGameCode(&gameCode);
}
//keyboard input
ControllerInput* newKeyInput = getContoller(newInputState, 0);
//TODO: figure out why this is special
ControllerInput* oldKeyInput = getContoller(oldInputState, 0);
*newKeyInput = {};
for(size_t i = 0; i < ARRAY_SIZE(oldKeyInput->buttons); i++) {
newKeyInput->buttons[i] = oldKeyInput->buttons[i];
}
while(SDL_PollEvent(&e)) {
processEvent(&e, newInputState, &state);
}
//controller input
for(int i = 0; i < MAX_SDL_CONTROLLERS; i++) {
if(sdlIC.controllers[i] != nullptr && SDL_GameControllerGetAttached(sdlIC.controllers[i])) {
ControllerInput* newCIState = getContoller(newInputState, i+1);
ControllerInput* oldCIState = getContoller(oldInputState, i+1);
int16_t xVal = SDL_GameControllerGetAxis(sdlIC.controllers[i], SDL_CONTROLLER_AXIS_LEFTX);
int16_t yVal = SDL_GameControllerGetAxis(sdlIC.controllers[i], SDL_CONTROLLER_AXIS_LEFTY);
newCIState->avgX = normalizeStickInput(xVal, LEFT_THUMB_DEADZONE);
newCIState->avgY = normalizeStickInput(yVal, LEFT_THUMB_DEADZONE);
if(newCIState->avgX != 0 || newCIState->avgY != 0) {
newCIState->isAnalog = true;
}
processControllerButtonInput(&newCIState->actionDown, &oldCIState->actionDown, &newCIState->isAnalog, sdlIC.controllers[i], SDL_CONTROLLER_BUTTON_A);
processControllerButtonInput(&newCIState->actionUp, &oldCIState->actionUp, &newCIState->isAnalog, sdlIC.controllers[i], SDL_CONTROLLER_BUTTON_Y);
processControllerButtonInput(&newCIState->actionLeft, &oldCIState->actionLeft, &newCIState->isAnalog, sdlIC.controllers[i], SDL_CONTROLLER_BUTTON_X);
processControllerButtonInput(&newCIState->actionRight, &oldCIState->actionRight, &newCIState->isAnalog, sdlIC.controllers[i], SDL_CONTROLLER_BUTTON_B);
processControllerButtonInput(&newCIState->directionDown, &oldCIState->directionDown, &newCIState->isAnalog, sdlIC.controllers[i], SDL_CONTROLLER_BUTTON_DPAD_DOWN);
processControllerButtonInput(&newCIState->directionUp, &oldCIState->directionUp, &newCIState->isAnalog, sdlIC.controllers[i], SDL_CONTROLLER_BUTTON_DPAD_UP);
processControllerButtonInput(&newCIState->directionLeft, &oldCIState->directionLeft, &newCIState->isAnalog, sdlIC.controllers[i], SDL_CONTROLLER_BUTTON_DPAD_LEFT);
processControllerButtonInput(&newCIState->directionRight, &oldCIState->directionRight, &newCIState->isAnalog, sdlIC.controllers[i], SDL_CONTROLLER_BUTTON_DPAD_RIGHT);
oldCIState->isAnalog = newCIState->isAnalog;
}
else {
//TODO: Logging
}
}
//TODO: Do this instead of processing input, not after
//process recording/playback
assert(!(state.isRecording && state.isPlayingBack));
if(state.isRecording) {
recordInput(newInputState, state.inputRecordFile);
}
if(state.isPlayingBack) {
playInput(newInputState, state.inputRecordFile);
}
//calculate audio buffers' indicies and sizes
SDL_LockAudioDevice(1);
uint32_t startIndex = srb.runningIndex % ARRAY_SIZE(srb.samples);
uint32_t endIndex = (srb.sampleToPlay + SOUND_LATENCY) % ARRAY_SIZE(srb.samples);
uint32_t samplesToGetFromGame = (startIndex <= endIndex) ? endIndex - startIndex : (ARRAY_SIZE(srb.samples) - startIndex) + endIndex;
sb.numSamples = samplesToGetFromGame;
SDL_UnlockAudioDevice(1);
gameCode.guarf(&gameMemory, &gOsb, &sb, newInputState, secsSinceLastFrame);
updateSDLSoundBuffer(&srb, &sb, startIndex, endIndex);
updateWindow(window, gTexture);
InputContext* temp = newInputState;
newInputState = oldInputState;
oldInputState = temp;
//benchmark stuff
real32_t secsElapsed = secondsForCountRange(startCount, SDL_GetPerformanceCounter());
//sleep to lock frame rate
if(secsElapsed < targetFrameSeconds) {
//NOTE: .5 denotes the amount we will spin manually since
// SDL_Delay is not 100% accurate
real32_t timeToSleep = (targetFrameSeconds - secsElapsed)*1000 - .5;
SDL_Delay(timeToSleep);
secsElapsed = secondsForCountRange(startCount, SDL_GetPerformanceCounter());
//This assert will fire if the window is moved
//assert(secondsForCountRange(startCount, SDL_GetPerformanceCounter()) < targetFrameSeconds);
while(secondsForCountRange(startCount, SDL_GetPerformanceCounter()) < targetFrameSeconds) {
//wait
}
secsElapsed = secondsForCountRange(startCount, SDL_GetPerformanceCounter());
}
uint64_t endCount = SDL_GetPerformanceCounter();
real32_t fpsCount = ((1./secsElapsed));
real32_t mcPerFrame = (real32_t)(endCount-startCount) / (1000 * 1000 );
printf("TPF: %.2fms FPS: %.2f MCPF: %.2f\n", secsElapsed*1000, fpsCount, mcPerFrame);
startCount = endCount;
secsSinceLastFrame = secsElapsed;
}
cleanUp(&state, &gameCode);
return 0;
}
void snd_PlayStreaming( int streamID, float volume, float pan ) // todo: fade in?
{
assert( ( streamID >= 0 ) && ( streamID < MAX_STREAMING_SOUNDS ) );
SDL_LockAudioDevice( devID ); {
if( ( streamingSounds[streamID].access != NULL ) && !streamingSounds[streamID].playing ) {
streamingSounds[streamID].sdlStream = SDL_NewAudioStream( AUDIO_S16,
(Uint8)( streamingSounds[streamID].access->channels ), streamingSounds[streamID].access->sample_rate,
WORKING_FORMAT, streamingSounds[streamID].channels, WORKING_RATE );
if( streamingSounds[streamID].sdlStream == NULL ) {
llog( LOG_ERROR, "Unable to create SDL_AudioStream for streaming sound." );
return;
}
streamingSounds[streamID].playing = true;
streamingSounds[streamID].volume = volume;
streamingSounds[streamID].pan = pan;
stb_vorbis_seek_start( streamingSounds[streamID].access );
streamingSounds[streamID].readDone = false;
}
} SDL_UnlockAudioDevice( devID );
}
void snd_ChangeStreamVolume( int streamID, float volume )
{
assert( ( streamID >= 0 ) && ( streamID < MAX_STREAMING_SOUNDS ) );
SDL_LockAudioDevice( devID ); {
streamingSounds[streamID].volume = volume;
} SDL_UnlockAudioDevice( devID );
}
void snd_ChangeStreamPan( int streamID, float pan )
{
assert( ( streamID >= 0 ) && ( streamID < MAX_STREAMING_SOUNDS ) );
SDL_LockAudioDevice( devID ); {
streamingSounds[streamID].pan = pan;
} SDL_UnlockAudioDevice( devID );
}
void SDL2Sink::EnqueueSamples(const s16* samples, size_t sample_count) {
if (impl->audio_device_id <= 0)
return;
SDL_LockAudioDevice(impl->audio_device_id);
impl->queue.emplace_back(samples, samples + sample_count * 2);
SDL_UnlockAudioDevice(impl->audio_device_id);
}
void SDLAudioContext::PauseAudio(AudioObject& ao)
{
SDL_LockAudioDevice(m_device);
RemoveAudio(ao);
SDL_UnlockAudioDevice(m_device);
}
static void SSDL_UnlockBuffer(soundcardinfo_t *sc, void *buffer)
{
#if SDL_MAJOR_VERSION >= 2
SDL_UnlockAudioDevice(sc->audio_fd);
#else
SDL_UnlockAudio();
#endif
}
// Pan is assumed to be [-1,1]
void snd_ChangeSoundPan( EntityID soundID, float pan )
{
SDL_LockAudioDevice( devID ); {
if( idSet_IsIDValid( &playingIDSet, soundID ) ) {
int idx = idSet_GetIndex( soundID );
playingSounds[idx].pan = pan;
}
} SDL_UnlockAudioDevice( devID );
}
void snd_SetVolume( float volume, unsigned int group )
{
assert( group < sb_Count( sbSoundGroups ) );
assert( ( volume >= 0.0f ) && ( volume <= 1.0f ) );
SDL_LockAudioDevice( devID ); {
sbSoundGroups[group].volume = volume;
} SDL_UnlockAudioDevice( devID );
}
// Volume is assumed to be [0,1]
void snd_ChangeSoundVolume( EntityID soundID, float volume )
{
SDL_LockAudioDevice( devID ); {
if( idSet_IsIDValid( &playingIDSet, soundID ) ) {
int idx = idSet_GetIndex( soundID );
playingSounds[idx].volume = volume;
}
} SDL_UnlockAudioDevice( devID );
}
void snd_StopStreaming( int streamID )
{
assert( ( streamID >= 0 ) && ( streamID < MAX_STREAMING_SOUNDS ) );
SDL_LockAudioDevice( devID ); {
streamingSounds[streamID].playing = false;
SDL_FreeAudioStream( streamingSounds[streamID].sdlStream );
streamingSounds[streamID].sdlStream = NULL;
} SDL_UnlockAudioDevice( devID );
}
void SDLAudioContext::PlayAudio(AudioObject& ao)
{
SDL_LockAudioDevice(m_device);
// This prevents duplicates
RemoveAudio(ao);
m_playingAudio.push_back(&ao);
SDL_UnlockAudioDevice(m_device);
}
void AudioManager::add_sound(std::shared_ptr<SoundImpl> sound) {
SDL_LockAudioDevice(device_id);
auto category = sound->get_category();
auto &playing_list = playing_sounds.find(category)->second;
// TODO probably check if sound already exists in playing list
playing_list.push_back(sound);
SDL_UnlockAudioDevice(device_id);
}
/**
* \brief Locks and unlocks open audio device.
*
* \sa https://wiki.libsdl.org/SDL_LockAudioDevice
* \sa https://wiki.libsdl.org/SDL_UnlockAudioDevice
*/
int audio_lockUnlockOpenAudioDevice()
{
int i;
int count;
char *device;
SDL_AudioDeviceID id;
SDL_AudioSpec desired, obtained;
/* Get number of devices. */
count = SDL_GetNumAudioDevices(0);
SDLTest_AssertPass("Call to SDL_GetNumAudioDevices(0)");
if (count > 0) {
for (i = 0; i < count; i++) {
/* Get device name */
device = (char *)SDL_GetAudioDeviceName(i, 0);
SDLTest_AssertPass("SDL_GetAudioDeviceName(%i,0)", i);
SDLTest_AssertCheck(device != NULL, "Validate device name is not NULL; got: %s", (device != NULL) ? device : "NULL");
if (device == NULL) return TEST_ABORTED;
/* Set standard desired spec */
desired.freq=22050;
desired.format=AUDIO_S16SYS;
desired.channels=2;
desired.samples=4096;
desired.callback=_audio_testCallback;
desired.userdata=NULL;
/* Open device */
id = SDL_OpenAudioDevice((const char *)device, 0, &desired, &obtained, SDL_AUDIO_ALLOW_ANY_CHANGE);
SDLTest_AssertPass("SDL_OpenAudioDevice('%s',...)", device);
SDLTest_AssertCheck(id > 1, "Validate device ID; expected: >=2, got: %i", id);
if (id > 1) {
/* Lock to protect callback */
SDL_LockAudioDevice(id);
SDLTest_AssertPass("SDL_LockAudioDevice(%i)", id);
/* Simulate callback processing */
SDL_Delay(10);
SDLTest_Log("Simulate callback processing - delay");
/* Unlock again */
SDL_UnlockAudioDevice(id);
SDLTest_AssertPass("SDL_UnlockAudioDevice(%i)", id);
/* Close device again */
SDL_CloseAudioDevice(id);
SDLTest_AssertPass("Call to SDL_CloseAudioDevice()");
}
}
} else {
SDLTest_Log("No devices to test with");
}
return TEST_COMPLETED;
}
void snd_UnloadStream( int streamID )
{
assert( ( streamID >= 0 ) && ( streamID < MAX_STREAMING_SOUNDS ) );
SDL_LockAudioDevice( devID ); {
streamingSounds[streamID].playing = false;
stb_vorbis_close( streamingSounds[streamID].access );
streamingSounds[streamID].access = NULL;
SDL_FreeAudioStream( streamingSounds[streamID].sdlStream );
streamingSounds[streamID].sdlStream = NULL;
} SDL_UnlockAudioDevice( devID );
}
void SDLAudioContext::StopAudio(AudioObject& ao)
{
SDL_LockAudioDevice(m_device);
if(RemoveAudio(ao))
{
ao.SetPos(0.0);
}
SDL_UnlockAudioDevice(m_device);
}
void snd_SetMasterVolume( float volume )
{
SDL_LockAudioDevice( devID ); {
masterVolume = volume;
} SDL_UnlockAudioDevice( devID );
// just save this out every single time
if( soundCfgFile != NULL ) {
cfg_SetInt( soundCfgFile, "vol", (int)volume );
cfg_SaveFile( soundCfgFile );
}
}
void snd_StopStreamingAllBut( int streamID )
{
SDL_LockAudioDevice( devID ); {
for( int i = 0; i < MAX_STREAMING_SOUNDS; ++i ) {
if( i == streamID ) continue;
if( ( streamingSounds[i].access != NULL ) && streamingSounds[i].playing ) {
streamingSounds[i].playing = false;
SDL_FreeAudioStream( streamingSounds[streamID].sdlStream );
streamingSounds[streamID].sdlStream = NULL;
}
}
} SDL_UnlockAudioDevice( devID );
}
void snd_CleanUp( )
{
snd_StopStreamingAllBut( -1 );
if( workingBuffer != NULL ) {
SDL_LockAudioDevice( devID ); {
sb_Release( sbStreamWorkingBuffer );
mem_Release( workingBuffer );
workingBuffer = NULL;
} SDL_UnlockAudioDevice( devID );
}
if( devID == 0 ) return;
SDL_CloseAudioDevice( devID );
}
void AudioManager::remove_sound(std::shared_ptr<SoundImpl> sound) {
SDL_LockAudioDevice(device_id);
auto category = sound->get_category();
auto &playing_list = playing_sounds.find(category)->second;
for (size_t i = 0; i < playing_list.size(); i++) {
if (playing_list[i] == sound) {
remove_from_vector(playing_list, i);
break;
}
}
SDL_UnlockAudioDevice(device_id);
}
size_t SDL2Sink::SamplesInQueue() const {
if (impl->audio_device_id <= 0)
return 0;
SDL_LockAudioDevice(impl->audio_device_id);
size_t total_size = std::accumulate(impl->queue.begin(), impl->queue.end(), static_cast<size_t>(0),
[](size_t sum, const auto& buffer) {
// Division by two because each stereo sample is made of two s16.
return sum + buffer.size() / 2;
});
SDL_UnlockAudioDevice(impl->audio_device_id);
return total_size;
}
static void sdl_fill_audio_ring_buffer(sdl_audio_ring_buffer_t* ring_buffer, memory_block_t* sound_samples, int32_t bytes_to_write)
{
int32_t region1_size, region2_size;
int16_t* region1;
int16_t* region2;
SDL_LockAudioDevice(1);
region1_size = bytes_to_write;
region2_size = 0;
if ((ring_buffer->write_index + region1_size) > ring_buffer->size) {
region1_size = ring_buffer->size - ring_buffer->write_index;
region2_size = bytes_to_write - region1_size;
}
memcpy(ring_buffer->data + ring_buffer->write_index, sound_samples->base, region1_size);
memcpy(ring_buffer->data, (uint8_t*)sound_samples->base + region1_size, region2_size);
ring_buffer->write_index = (ring_buffer->write_index + bytes_to_write) % ring_buffer->size;
SDL_UnlockAudioDevice(1);
}
// Returns an id that can be used to change the volume and pitch
// loops - if the sound will loop back to the start once it's over
// volume - how loud the sound will be, in the range [0,1], 0 being off, 1 being loudest
// pitch - pitch change for the sound, multiplies the sample rate, 1 for normal, lesser for slower, higher for faster
// pan - how far left or right the sound is, 0 is center, -1 is left, +1 is right
// TODO: Some sort of event system so we can get when a sound has finished playing?
EntityID snd_Play( int sampleID, float volume, float pitch, float pan, unsigned int group )
{
assert( group >= 0 );
assert( group < sb_Count( sbSoundGroups ) );
EntityID playingID = INVALID_ENTITY_ID;
SDL_LockAudioDevice( devID ); {
playingID = idSet_ClaimID( &playingIDSet );
if( playingID != INVALID_ENTITY_ID ) {
int idx = idSet_GetIndex( playingID );
playingSounds[idx].sample = sampleID;
playingSounds[idx].volume = volume;
playingSounds[idx].pitch = pitch;
playingSounds[idx].pan = pan;
playingSounds[idx].pos = 0.0f;
playingSounds[idx].group = group;
}
} SDL_UnlockAudioDevice( devID );
return playingID;
}
void snd_UnloadSample( int sampleID )
{
assert( sampleID >= 0 );
assert( sampleID < MAX_SAMPLES );
if( samples[sampleID].data == NULL ) {
return;
}
SDL_LockAudioDevice( devID ); {
// find all playing sounds using this sample and stop them
for( EntityID id = idSet_GetFirstValidID( &playingIDSet ); id != INVALID_ENTITY_ID; id = idSet_GetNextValidID( &playingIDSet, id ) ) {
int idx = idSet_GetIndex( id );
if( playingSounds[idx].sample == sampleID ) {
idSet_ReleaseID( &playingIDSet, id );
}
}
mem_Release( samples[sampleID].data );
samples[sampleID].data = NULL;
} SDL_UnlockAudioDevice( devID );
}
/* Sets up the SDL mixer. Returns 0 on success. */
int snd_Init( unsigned int numGroups )
{
assert( numGroups > 0 );
// clear out the samples storage
SDL_memset( samples, 0, ARRAY_SIZE( samples ) * sizeof( samples[0] ) );
for( int i = 0; i < MAX_STREAMING_SOUNDS; ++i ) {
streamingSounds[i].access = NULL;
streamingSounds[i].sdlStream = NULL;
streamingSounds[i].playing = false;
}
SDL_AudioSpec desired;
SDL_memset( &desired, 0, sizeof( desired ) );
desired.freq = WORKING_RATE;
desired.format = WORKING_FORMAT;
desired.channels = WORKING_CHANNELS;
desired.samples = AUDIO_SAMPLES;
desired.callback = mixerCallback;
desired.userdata = NULL;
if( idSet_Init( &playingIDSet, MAX_PLAYING_SOUNDS ) != 0 ) {
llog( LOG_CRITICAL, "Failed to create playing sounds id set." );
return -1;
}
// sending 0 will cause SDL to convert everything automatically
devID = SDL_OpenAudioDevice( NULL, 0, &desired, NULL, 0 );
if( devID == 0 ) {
llog( LOG_CRITICAL, "Failed to open audio device: %s", SDL_GetError( ) );
return -1;
}
SDL_PauseAudioDevice( devID, 0 );
workingSilence = desired.silence;
workingBufferSize = desired.samples * desired.channels * ( ( SDL_AUDIO_MASK_BITSIZE & WORKING_FORMAT ) / 8 );
SDL_LockAudioDevice( devID );
workingBuffer = mem_Allocate( workingBufferSize );
SDL_UnlockAudioDevice( devID );
if( workingBuffer == NULL ) {
llog( LOG_CRITICAL, "Failed to create audio working buffer." );
return -1;
}
sb_Add( sbSoundGroups, numGroups );
for( size_t i = 0; i < sb_Count( sbSoundGroups ); ++i ) {
sbSoundGroups[i].volume = 1.0f;
}
// load the master volume
soundCfgFile = cfg_OpenFile( "snd.cfg" );
if( soundCfgFile != NULL ) {
int vol;
cfg_GetInt( soundCfgFile, "vol", 1, &vol );
masterVolume = (float)vol;
} else {
masterVolume = 1.0f;
}
return 0;
}
void unlock_audio() { SDL_UnlockAudioDevice(audio_device_id); }
void snd_SetFocus( bool hasFocus )
{
SDL_LockAudioDevice( devID ); {
SDL_PauseAudioDevice( devID, hasFocus ? 0 : 1 );
} SDL_UnlockAudioDevice( devID );
}
void Mixer::Unlock()
{
SDL_UnlockAudioDevice(deviceid);
}
void Mix_UnlockAudio()
{
SDL_UnlockAudioDevice(audio_device);
}
void snd_Stop( EntityID soundID )
{
SDL_LockAudioDevice( devID ); {
idSet_ReleaseID( &playingIDSet, soundID );
} SDL_UnlockAudioDevice( devID );
}