mirror of https://github.com/AxioDL/amuse.git
140 lines
3.8 KiB
C++
140 lines
3.8 KiB
C++
#include "amuse/Emitter.hpp"
|
|
#include "amuse/Listener.hpp"
|
|
#include "amuse/Voice.hpp"
|
|
#include "amuse/Engine.hpp"
|
|
|
|
namespace amuse
|
|
{
|
|
|
|
static void Delta(Vector3f& out, const Vector3f& a, const Vector3f& b)
|
|
{
|
|
out[0] = a[0] - b[0];
|
|
out[1] = a[1] - b[1];
|
|
out[2] = a[2] - b[2];
|
|
}
|
|
|
|
Emitter::~Emitter() {}
|
|
|
|
Emitter::Emitter(Engine& engine, const AudioGroup& group, const std::shared_ptr<Voice>& vox,
|
|
float maxDist, float minVol, float falloff, bool doppler)
|
|
: Entity(engine, group, vox->getObjectId()), m_vox(vox), m_maxDist(maxDist),
|
|
m_minVol(clamp(0.f, minVol, 1.f)), m_falloff(clamp(-1.f, falloff, 1.f)), m_doppler(doppler)
|
|
{
|
|
}
|
|
|
|
void Emitter::_destroy()
|
|
{
|
|
Entity::_destroy();
|
|
m_vox->kill();
|
|
}
|
|
|
|
float Emitter::_attenuationCurve(float dist) const
|
|
{
|
|
if (dist > m_maxDist)
|
|
return 0.f;
|
|
float t = dist / m_maxDist;
|
|
if (m_falloff < 0.f)
|
|
{
|
|
float tmp = t * 10.f + 1.f;
|
|
tmp = 1.f / (tmp * tmp);
|
|
return (1.f + m_falloff) * (-t + 1.f) + -m_falloff * tmp;
|
|
}
|
|
else if (m_falloff > 0.f)
|
|
{
|
|
float tmp = (t - 1.f) * 10.f - 1.f;
|
|
tmp = -1.f / (tmp * tmp) + 1.f;
|
|
return (1.f - m_falloff) * (-t + 1.f) + m_falloff * tmp;
|
|
}
|
|
else
|
|
{
|
|
return -t + 1.f;
|
|
}
|
|
}
|
|
|
|
void Emitter::_update()
|
|
{
|
|
if (!m_dirty)
|
|
{
|
|
/* Ensure that all listeners are also not dirty */
|
|
bool dirty = false;
|
|
for (auto& listener : m_engine.m_activeListeners)
|
|
{
|
|
if (listener->m_dirty)
|
|
{
|
|
dirty = true;
|
|
break;
|
|
}
|
|
}
|
|
if (!dirty)
|
|
return;
|
|
}
|
|
|
|
float coefs[8] = {};
|
|
double avgDopplerRatio = 0.0;
|
|
|
|
for (auto& listener : m_engine.m_activeListeners)
|
|
{
|
|
Vector3f listenerToEmitter;
|
|
Delta(listenerToEmitter, m_pos, listener->m_pos);
|
|
float dist = Length(listenerToEmitter);
|
|
float panDist = Dot(listenerToEmitter, listener->m_right);
|
|
float frontPan = clamp(-1.f, panDist / listener->m_frontDiff, 1.f);
|
|
float backPan = clamp(-1.f, panDist / listener->m_backDiff, 1.f);
|
|
float spanDist = -Dot(listenerToEmitter, listener->m_heading);
|
|
float span = clamp(-1.f, spanDist > 0.f ? spanDist / listener->m_backDiff :
|
|
spanDist / listener->m_frontDiff, 1.f);
|
|
|
|
/* Calculate attenuation */
|
|
float att = _attenuationCurve(dist);
|
|
att = (1.f - att) * m_minVol + att * m_maxVol;
|
|
|
|
/* Apply pan law */
|
|
float thisCoefs[8] = {};
|
|
m_vox->_panLaw(thisCoefs, frontPan, backPan, span);
|
|
|
|
/* Take maximum coefficient across listeners */
|
|
for (int i=0 ; i<8 ; ++i)
|
|
coefs[i] = std::max(coefs[i], thisCoefs[i] * att * listener->m_volume);
|
|
|
|
/* Calculate doppler */
|
|
if (m_doppler)
|
|
{
|
|
/* Positive values indicate emitter and listener closing in */
|
|
Vector3f dirDelta;
|
|
Delta(dirDelta, m_dir, listener->m_dir);
|
|
Vector3f posDelta;
|
|
Delta(posDelta, listener->m_pos, m_pos);
|
|
Normalize(posDelta);
|
|
float deltaSpeed = Dot(dirDelta, posDelta);
|
|
if (listener->m_soundSpeed != 0.f)
|
|
avgDopplerRatio += 1.0 + deltaSpeed / listener->m_soundSpeed;
|
|
else
|
|
avgDopplerRatio += 1.0;
|
|
}
|
|
}
|
|
|
|
if (m_engine.m_activeListeners.size() != 0)
|
|
{
|
|
m_vox->setChannelCoefs(coefs);
|
|
if (m_doppler)
|
|
{
|
|
m_vox->m_dopplerRatio = avgDopplerRatio / float(m_engine.m_activeListeners.size());
|
|
m_vox->m_pitchDirty = true;
|
|
}
|
|
}
|
|
|
|
m_dirty = false;
|
|
}
|
|
|
|
void Emitter::setVectors(const float* pos, const float* dir)
|
|
{
|
|
for (int i=0 ; i<3 ; ++i)
|
|
{
|
|
m_pos[i] = pos[i];
|
|
m_dir[i] = dir[i];
|
|
}
|
|
m_dirty = true;
|
|
}
|
|
|
|
}
|