ref: 6e71350b6a996d27229ca18ac386f83c6e4ad58b
dir: /src/mixer/ft2_mix_macros.h/
#pragma once
#include <assert.h>
#include "../ft2_audio.h"
#include "ft2_cubic.h"
/* ----------------------------------------------------------------------- */
/* GENERAL MIXER MACROS */
/* ----------------------------------------------------------------------- */
#define GET_VOL \
const float fVolL = v->fVolL; \
const float fVolR = v->fVolR; \
#define GET_VOL_MONO \
const float fVolL = v->fVolL; \
#define GET_VOL_RAMP \
fVolL = v->fVolL; \
fVolR = v->fVolR; \
#define GET_VOL_MONO_RAMP \
fVolL = v->fVolL; \
#define SET_VOL_BACK \
v->fVolL = fVolL; \
v->fVolR = fVolR; \
#define SET_VOL_BACK_MONO \
v->fVolL = v->fVolR = fVolL; \
#define GET_MIXER_VARS \
const uint64_t delta = v->delta; \
fMixBufferL = audio.fMixBufferL; \
fMixBufferR = audio.fMixBufferR; \
pos = v->pos; \
posFrac = v->posFrac; \
#define GET_MIXER_VARS_RAMP \
const uint64_t delta = v->delta; \
fMixBufferL = audio.fMixBufferL; \
fMixBufferR = audio.fMixBufferR; \
fVolLDelta = v->fVolDeltaL; \
fVolRDelta = v->fVolDeltaR; \
pos = v->pos; \
posFrac = v->posFrac; \
#define GET_MIXER_VARS_MONO_RAMP \
const uint64_t delta = v->delta; \
fMixBufferL = audio.fMixBufferL; \
fMixBufferR = audio.fMixBufferR; \
fVolLDelta = v->fVolDeltaL; \
pos = v->pos; \
posFrac = v->posFrac; \
#define SET_BASE8 \
base = v->base8; \
smpPtr = base + pos; \
#define SET_BASE16 \
base = v->base16; \
smpPtr = base + pos; \
#define SET_BASE8_BIDI \
base = v->base8; \
revBase = v->revBase8; \
#define SET_BASE16_BIDI \
base = v->base16; \
revBase = v->revBase16; \
#define INC_POS \
posFrac += delta; \
smpPtr += posFrac >> MIXER_FRAC_BITS; \
posFrac &= MIXER_FRAC_MASK; \
#define INC_POS_BIDI \
posFrac += deltaLo; \
smpPtr += posFrac >> MIXER_FRAC_BITS; \
smpPtr += deltaHi; \
posFrac &= MIXER_FRAC_MASK; \
#define SET_BACK_MIXER_POS \
v->posFrac = posFrac; \
v->pos = pos; \
/* ----------------------------------------------------------------------- */
/* SAMPLE RENDERING MACROS */
/* ----------------------------------------------------------------------- */
#define VOLUME_RAMPING \
fVolL += fVolLDelta; \
fVolR += fVolRDelta; \
#define VOLUME_RAMPING_MONO \
fVolL += fVolLDelta; \
#define RENDER_8BIT_SMP \
assert(smpPtr >= base && smpPtr < base+v->end); \
fSample = *smpPtr * (1.0f / 128.0f); \
*fMixBufferL++ += fSample * fVolL; \
*fMixBufferR++ += fSample * fVolR; \
#define RENDER_8BIT_SMP_MONO \
assert(smpPtr >= base && smpPtr < base+v->end); \
fSample = (*smpPtr * (1.0f / 128.0f)) * fVolL; \
*fMixBufferL++ += fSample; \
*fMixBufferR++ += fSample; \
#define RENDER_16BIT_SMP \
assert(smpPtr >= base && smpPtr < base+v->end); \
fSample = *smpPtr * (1.0f / 32768.0f); \
*fMixBufferL++ += fSample * fVolL; \
*fMixBufferR++ += fSample * fVolR; \
#define RENDER_16BIT_SMP_MONO \
assert(smpPtr >= base && smpPtr < base+v->end); \
fSample = (*smpPtr * (1.0f / 32768.0f)) * fVolL; \
*fMixBufferL++ += fSample; \
*fMixBufferR++ += fSample; \
// 4-tap cubic spline interpolation through LUT (mixer/ft2_cubic.c)
#define INTERPOLATE(LUT, s0, s1, s2, s3, f) \
{ \
const float *t = (const float *)LUT + ((f >> CUBIC_FSHIFT) & CUBIC_FMASK); \
s0 = (s0 * t[0]) + (s1 * t[1]) + (s2 * t[2]) + (s3 * t[3]); \
} \
/* 8bitbubsy: It may look like we are potentially going out of bounds by looking up sample point
** -1, 1 and 2, but the sample data is actually padded on both the left (negative) and right side,
** where correct samples are stored according to loop mode (or no loop).
**
** The only issue is that the -1 look-up gets wrong information if loopStart>0 on looped-samples,
** and the sample-position is at loopStart. The spline will get ever so slighty wrong because of this,
** but it's barely audible anyway. Doing it elsewise would require a refactoring of how the audio mixer
** works!
*/
#define RENDER_8BIT_SMP_INTRP \
assert(smpPtr >= base && smpPtr < base+v->end); \
fSample = smpPtr[-1]; \
fSample2 = smpPtr[0]; \
fSample3 = smpPtr[1]; \
fSample4 = smpPtr[2]; \
INTERPOLATE(fCubicLUT8, fSample, fSample2, fSample3, fSample4, posFrac) \
*fMixBufferL++ += fSample * fVolL; \
*fMixBufferR++ += fSample * fVolR; \
#define RENDER_8BIT_SMP_MONO_INTRP \
assert(smpPtr >= base && smpPtr < base+v->end); \
fSample = smpPtr[-1]; \
fSample2 = smpPtr[0]; \
fSample3 = smpPtr[1]; \
fSample4 = smpPtr[2]; \
INTERPOLATE(fCubicLUT8, fSample, fSample2, fSample3, fSample4, posFrac) \
fSample *= fVolL; \
*fMixBufferL++ += fSample; \
*fMixBufferR++ += fSample; \
#define RENDER_16BIT_SMP_INTRP \
assert(smpPtr >= base && smpPtr < base+v->end); \
fSample = smpPtr[-1]; \
fSample2 = smpPtr[0]; \
fSample3 = smpPtr[1]; \
fSample4 = smpPtr[2]; \
INTERPOLATE(fCubicLUT16, fSample, fSample2, fSample3, fSample4, posFrac) \
*fMixBufferL++ += fSample * fVolL; \
*fMixBufferR++ += fSample * fVolR; \
#define RENDER_16BIT_SMP_MONO_INTRP \
assert(smpPtr >= base && smpPtr < base+v->end); \
fSample = smpPtr[-1]; \
fSample2 = smpPtr[0]; \
fSample3 = smpPtr[1]; \
fSample4 = smpPtr[2]; \
INTERPOLATE(fCubicLUT16, fSample, fSample2, fSample3, fSample4, posFrac) \
fSample *= fVolL; \
*fMixBufferL++ += fSample; \
*fMixBufferR++ += fSample; \
/* ----------------------------------------------------------------------- */
/* SAMPLES-TO-MIX LIMITING MACROS */
/* ----------------------------------------------------------------------- */
#define LIMIT_MIX_NUM \
i = (v->end - 1) - pos; \
if (i > 65535) \
i = 65535; \
\
i = (i << 16) | ((uint32_t)(posFrac >> 16) ^ 0xFFFF); \
samplesToMix = ((int64_t)i * v->revDelta) >> 32; \
samplesToMix++; \
\
if (samplesToMix > samplesLeft) \
samplesToMix = samplesLeft; \
#define START_BIDI \
if (v->backwards) \
{ \
tmpDelta = 0 - delta; \
assert(pos >= v->loopStart && pos < v->end); \
pos = ~pos; \
smpPtr = revBase + pos; \
posFrac ^= MIXER_FRAC_MASK; \
} \
else \
{ \
tmpDelta = delta; \
assert(pos >= 0 && pos < v->end); \
smpPtr = base + pos; \
} \
\
const int32_t deltaHi = (int64_t)tmpDelta >> MIXER_FRAC_BITS; \
const uint32_t deltaLo = tmpDelta & MIXER_FRAC_MASK; \
#define LIMIT_MIX_NUM_RAMP \
if (v->volRampSamples == 0) \
{ \
fVolLDelta = 0; \
fVolRDelta = 0; \
\
if (v->isFadeOutVoice) \
{ \
v->active = false; /* volume ramp fadeout-voice is done, shut it down */ \
return; \
} \
} \
else \
{ \
if (samplesToMix > v->volRampSamples) \
samplesToMix = v->volRampSamples; \
\
v->volRampSamples -= samplesToMix; \
} \
#define LIMIT_MIX_NUM_MONO_RAMP \
if (v->volRampSamples == 0) \
{ \
fVolLDelta = 0; \
if (v->isFadeOutVoice) \
{ \
v->active = false; /* volume ramp fadeout-voice is done, shut it down */ \
return; \
} \
} \
else \
{ \
if (samplesToMix > v->volRampSamples) \
samplesToMix = v->volRampSamples; \
\
v->volRampSamples -= samplesToMix; \
} \
#define HANDLE_SAMPLE_END \
pos = (int32_t)(smpPtr - base); \
if (pos >= v->end) \
{ \
v->active = false; \
return; \
} \
#define WRAP_LOOP \
pos = (int32_t)(smpPtr - base); \
while (pos >= v->end) \
pos -= v->loopLength; \
smpPtr = base + pos; \
#define WRAP_BIDI_LOOP \
while (pos >= v->end) \
{ \
pos -= v->loopLength; \
v->backwards ^= 1; \
} \
#define END_BIDI \
if (v->backwards) \
{ \
posFrac ^= MIXER_FRAC_MASK; \
pos = ~(int32_t)(smpPtr - revBase); \
} \
else \
{ \
pos = (int32_t)(smpPtr - base); \
} \