void SceneManager::run()
{
sf::Clock clock;
int timerThen = clock.restart().asMilliseconds();
while (m_window.isOpen())
{
int timerNow = clock.getElapsedTime().asMilliseconds();
while (timerThen < timerNow)
{
processFade();
if (m_shakeCounter > 0)
{
m_shakeCounter--;
}
pollEvents();
if (m_scenes.size() > 0)
{
m_scenes.back()->update();
}
cleanUp();
timerThen += 1000 / config::FPS;
}
draw();
sf::sleep(sf::milliseconds(timerThen - timerNow));
}
}
void LoopMachine::processFadeOut(int groupIx, int loopIx, float frameStartTicks,
float frameEndTicks, float fadeStartTicks, float fadeEndTicks,
const AudioSourceChannelInfo& bufferToFill)
{
// MPD: all done.
if (frameStartTicks < fadeStartTicks && frameEndTicks > fadeEndTicks) {
// this frame is large and completely contains the fadeout period.
// in other words, start segment is normal, and then it fades out within this interval
// |---------- |
// | \ |
// | \___________|
// pre-f f post-f
int numSamples = fixedBpmTransport.ticksToSamples(fadeStartTicks-frameStartTicks);
// pre-f
processBlock(groupIx, loopIx, 0, numSamples, bufferToFill);
// f
float startGain = 1;
float endGain = 0;
int len = fixedBpmTransport.ticksToSamples(fadeEndTicks-fadeStartTicks);
processFade(groupIx, loopIx, startGain, endGain, numSamples, len, bufferToFill);
// post-f
// NOP: we'd be outputting only zeros.
} else if (frameEndTicks < fadeStartTicks) {
// this frame ends before the start of the fade period: there is no fade in this period.
// this means we need to process the block as if it was full volume.
processBlock(groupIx, loopIx, 0, bufferToFill.numSamples, bufferToFill);
} else if (frameStartTicks < fadeStartTicks && frameEndTicks >= fadeStartTicks) {
// the fade period begins somewhere in this frame
// this frame is very small compared to the fade time and is completely contained
// within it.
// |-----|----- |
// | | \ |
// | | \ |
// | | \|
// | | \
// | | |\
// | | | \___________
// f start f end
int numSamples = fixedBpmTransport.ticksToSamples(fadeStartTicks-frameStartTicks);
processBlock(groupIx, loopIx, 0, numSamples, bufferToFill);
float startGain = 1;
float endGain = (fadeEndTicks-frameEndTicks)/(fadeEndTicks-fadeStartTicks);
processFade(groupIx, loopIx, startGain, endGain, numSamples, bufferToFill.numSamples-numSamples, bufferToFill);
} else if (frameStartTicks > fadeStartTicks && frameEndTicks > fadeEndTicks) {
// the fade period (i.e. the next tick!) end occurs within this frame.
// |---------- | |
// | \| |
// | |\ |
// | | \_______|____
int numSamples = fixedBpmTransport.ticksToSamples(fadeEndTicks-frameStartTicks);
float startGain = (fadeEndTicks-frameStartTicks)/(fadeEndTicks-fadeStartTicks);
float endGain = 0;
processFade(groupIx, loopIx, startGain, endGain, 0, numSamples, bufferToFill);
// and after that there's silence, so nothing more to do.
} else if (frameStartTicks > fadeStartTicks && frameEndTicks < fadeEndTicks) {
// this frame is very small compared to the fade time and is completely contained
// within it.
// |---------- | |
// | \| |
// | \ |
// | | \|
// | | \
// | | |\
// | | | \_______|____
float startGain = (fadeEndTicks-frameStartTicks)/(fadeEndTicks-fadeStartTicks);
float endGain = (fadeEndTicks-frameEndTicks)/(fadeEndTicks-fadeStartTicks);
processFade(groupIx, loopIx, startGain, endGain, 0, bufferToFill.numSamples, bufferToFill);
} else {
throw AudioEngineException("This really should never happen.");
}
}
void LoopMachine::processFadeIn(int groupIx, int loopIx, float frameStartTicks,
float frameEndTicks, float fadeStartTicks, float fadeEndTicks,
const AudioSourceChannelInfo& bufferToFill)
{
// std::cout << "MPD: CPP: LoopMachine::processFadeIn: starting group " << groupIx << ", sample " << loopIx << std::endl;
if (frameStartTicks < fadeStartTicks && frameEndTicks > fadeEndTicks) {
// std::cout << "MPD: CPP: LoopMachine::processFadeIn: case 1" << std::endl;
// this frame is large and completely contains the fadeout period.
// in other words, start segment is normal, and then it fades out within this interval
int offset = fixedBpmTransport.ticksToSamples(fadeStartTicks-frameStartTicks);
// pre-f
// NOP: we'd be outputting only zeros.
// f
float startGain = 0;
float endGain = 1;
int len = fixedBpmTransport.ticksToSamples(fadeEndTicks-fadeStartTicks);
processFade(groupIx, loopIx, startGain, endGain, offset, len, bufferToFill);
// post-f - audio is now at full volume!
processBlock(groupIx, loopIx, offset+len, bufferToFill.numSamples-offset-len, bufferToFill);
// MPD: done.
} else if (frameEndTicks < fadeStartTicks) {
// std::cout << "MPD: CPP: LoopMachine::processFadeIn: case 2" << std::endl;
// this frame ends before the start of the fade period: there is no fade in this period.
// this means we are in nop territory.
// MPD: done.
} else if (frameStartTicks < fadeStartTicks && frameEndTicks >= fadeStartTicks) {
// std::cout << "MPD: CPP: LoopMachine::processFadeIn: case 3" << std::endl;
// the fade period begins somewhere in this frame
// |-----|----- |
// | | \ |
// | | \ |
// | | \|
// | | \
// | | |\
// | | | \___________
// f start f end
int offset = fixedBpmTransport.ticksToSamples(fadeStartTicks-frameStartTicks);
float startGain = 0;
float endGain = (frameEndTicks-fadeStartTicks)/(fadeEndTicks-fadeStartTicks);
processFade(groupIx, loopIx, startGain, endGain, offset, bufferToFill.numSamples-offset, bufferToFill);
// MPD: done.
} else if (frameStartTicks > fadeStartTicks && frameEndTicks > fadeEndTicks) {
// std::cout << "MPD: CPP: LoopMachine::processFadeIn: case 4" << std::endl;
// the fade period (i.e. the next tick!) end occurs within this frame.
// |---------- | |
// | \| |
// | |\ |
// | | \_______|____
int numSamples = fixedBpmTransport.ticksToSamples(fadeEndTicks-frameStartTicks);
float startGain = (frameStartTicks-fadeStartTicks)/(fadeEndTicks-fadeStartTicks);
float endGain = 1;
processFade(groupIx, loopIx, startGain, endGain, 0, numSamples, bufferToFill);
// and after that we have to play the sample volle pulle
processBlock(groupIx, loopIx, numSamples, bufferToFill.numSamples-numSamples, bufferToFill);
// MPD: done.
} else if (frameStartTicks > fadeStartTicks && frameEndTicks < fadeEndTicks) {
// std::cout << "MPD: CPP: LoopMachine::processFadeIn: case 5" << std::endl;
// this frame is very small compared to the fade time and is completely contained
// within it.
// |---------- | |
// | \| |
// | \ |
// | | \|
// | | \
// | | |\
// | | | \_______|____
float startGain = (frameStartTicks-fadeStartTicks)/(fadeEndTicks-fadeStartTicks);
float endGain = (frameEndTicks-fadeStartTicks)/(fadeEndTicks-fadeStartTicks);
processFade(groupIx, loopIx, startGain, endGain, 0, bufferToFill.numSamples, bufferToFill);
} else {
throw AudioEngineException("This really should never happen.");
}
}
