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