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Diffstat (limited to 'muse2/plugins/freeverb/revmodel.cpp')
| -rw-r--r-- | muse2/plugins/freeverb/revmodel.cpp | 232 |
1 files changed, 232 insertions, 0 deletions
diff --git a/muse2/plugins/freeverb/revmodel.cpp b/muse2/plugins/freeverb/revmodel.cpp new file mode 100644 index 00000000..c72ee22b --- /dev/null +++ b/muse2/plugins/freeverb/revmodel.cpp @@ -0,0 +1,232 @@ +// Reverb model implementation +// +// Written by Jezar at Dreampoint, June 2000 +// http://www.dreampoint.co.uk +// This code is public domain + +#include <stdio.h> +#include "revmodel.h" + +//--------------------------------------------------------- +// Revmodel +//--------------------------------------------------------- + +Revmodel::Revmodel() + { + // Tie the components to their buffers + combL[0].setbuffer(bufcombL1,combtuningL1); + combR[0].setbuffer(bufcombR1,combtuningR1); + combL[1].setbuffer(bufcombL2,combtuningL2); + combR[1].setbuffer(bufcombR2,combtuningR2); + combL[2].setbuffer(bufcombL3,combtuningL3); + combR[2].setbuffer(bufcombR3,combtuningR3); + combL[3].setbuffer(bufcombL4,combtuningL4); + combR[3].setbuffer(bufcombR4,combtuningR4); + combL[4].setbuffer(bufcombL5,combtuningL5); + combR[4].setbuffer(bufcombR5,combtuningR5); + combL[5].setbuffer(bufcombL6,combtuningL6); + combR[5].setbuffer(bufcombR6,combtuningR6); + combL[6].setbuffer(bufcombL7,combtuningL7); + combR[6].setbuffer(bufcombR7,combtuningR7); + combL[7].setbuffer(bufcombL8,combtuningL8); + combR[7].setbuffer(bufcombR8,combtuningR8); + allpassL[0].setbuffer(bufallpassL1,allpasstuningL1); + allpassR[0].setbuffer(bufallpassR1,allpasstuningR1); + allpassL[1].setbuffer(bufallpassL2,allpasstuningL2); + allpassR[1].setbuffer(bufallpassR2,allpasstuningR2); + allpassL[2].setbuffer(bufallpassL3,allpasstuningL3); + allpassR[2].setbuffer(bufallpassR3,allpasstuningR3); + allpassL[3].setbuffer(bufallpassL4,allpasstuningL4); + allpassR[3].setbuffer(bufallpassR4,allpasstuningR4); + + // Set default values + allpassL[0].setfeedback(0.5f); + allpassR[0].setfeedback(0.5f); + allpassL[1].setfeedback(0.5f); + allpassR[1].setfeedback(0.5f); + allpassL[2].setfeedback(0.5f); + allpassR[2].setfeedback(0.5f); + allpassL[3].setfeedback(0.5f); + allpassR[3].setfeedback(0.5f); + + param[0] = initialroom; + param[1] = initialdamp; + param[2] = initialwet; + + setroomsize(initialroom); + setdamp(initialdamp); + setwidth(initialwidth); + setmode(initialmode); + + // Buffer will be full of rubbish - so we MUST mute them + + for (int i = 0; i < numcombs; i++) { + combL[i].mute(); + combR[i].mute(); + } + for (int i=0;i<numallpasses;i++) { + allpassL[i].mute(); + allpassR[i].mute(); + } + } + +//--------------------------------------------------------- +// activate +//--------------------------------------------------------- + +void Revmodel::activate() + { + *port[4] = param[0]; + *port[5] = param[1]; + *port[6] = param[2]; + } + +//--------------------------------------------------------- +// processreplace +//--------------------------------------------------------- + +void Revmodel::processreplace(long n) + { + if (param[0] != *port[4]) { + param[0] = *port[4]; + setroomsize(param[0]); + } + if (param[1] != *port[5]) { + param[1] = *port[5]; + setdamp(param[1]); + } + + float wet = (1.0f - *port[6]) * scalewet; + float dry = *port[6] * scaledry; + float wet1 = wet * (width/2 + 0.5f); + float wet2 = wet * ((1-width)/2); + + for (int i = 0; i < n; ++i) { + float outL = 0; + float outR = 0; + float input = (port[0][i] + port[1][i]) * gain; + + // Accumulate comb filters in parallel + for (int k = 0; k < numcombs; k++) { + outL += combL[k].process(input); + outR += combR[k].process(input); + } + + // Feed through allpasses in series + for (int k=0; k < numallpasses; k++) { + outL = allpassL[k].process(outL); + outR = allpassR[k].process(outR); + } + + // Calculate output REPLACING anything already there + port[2][i] = outL*wet1 + outR*wet2 + port[0][i]*dry; + port[3][i] = outR*wet1 + outL*wet2 + port[1][i]*dry; + } + } + +void Revmodel::processmix(long n) + { + if (param[0] != *port[4]) { + param[0] = *port[4]; + setroomsize(param[0]); + } + if (param[1] != *port[5]) { + param[1] = *port[5]; + setdamp(param[1]); + } + + float wet = (1.0f - *port[6]) * scalewet; + float dry = *port[6] * scaledry; + float wet1 = wet * (width/2 + 0.5f); + float wet2 = wet * ((1-width)/2); + + for (int i = 0; i < n; ++i) { + float outL = 0; + float outR = 0; + float input = (port[0][i] + port[1][i]) * gain; + + // Accumulate comb filters in parallel + for (int k = 0; k < numcombs; k++) { + outL += combL[k].process(input); + outR += combR[k].process(input); + } + + // Feed through allpasses in series + for (int k=0; k < numallpasses; k++) { + outL = allpassL[k].process(outL); + outR = allpassR[k].process(outR); + } + + // Calculate output REPLACING anything already there + port[2][i] += outL*wet1 + outR*wet2 + port[0][i]*dry; + port[3][i] += outR*wet1 + outL*wet2 + port[1][i]*dry; + } + } + +//--------------------------------------------------------- +// update +// Recalculate internal values after parameter change +//--------------------------------------------------------- + +void Revmodel::update() + { + if (mode >= freezemode) { + roomsize1 = 1; + damp1 = 0; + gain = muted; + } + else { + roomsize1 = roomsize; + damp1 = damp; + gain = fixedgain; + } + + for (int i = 0; i < numcombs; i++) { + combL[i].setfeedback(roomsize1); + combR[i].setfeedback(roomsize1); + } + + for (int i = 0; i < numcombs; i++) { + combL[i].setdamp(damp1); + combR[i].setdamp(damp1); + } + } + +// The following get/set functions are not inlined, because +// speed is never an issue when calling them, and also +// because as you develop the reverb model, you may +// wish to take dynamic action when they are called. + +void Revmodel::setroomsize(float value) + { + roomsize = (value*scaleroom) + offsetroom; + update(); + } + +float Revmodel::getroomsize() + { + return (roomsize-offsetroom)/scaleroom; + } + +void Revmodel::setdamp(float value) + { + damp = value*scaledamp; + update(); + } + +void Revmodel::setwidth(float value) + { + width = value; + update(); + } + +void Revmodel::setmode(float value) + { + mode = value; + update(); + } + +float Revmodel::getmode() + { + return (mode >= freezemode) ? 1 : 0; + } |