ref: 3e7b18472cba687a04f6cd9be66ad531ed24283c
dir: /src/mixer/ft2_mix_macros.h/
#pragma once
#include <assert.h>
#include "../ft2_audio.h"
#include "ft2_windowed_sinc.h"
/* ----------------------------------------------------------------------- */
/* GENERAL MIXER MACROS */
/* ----------------------------------------------------------------------- */
#define GET_VOL \
const double dVolL = v->dVolL; \
const double dVolR = v->dVolR; \
#define GET_VOL_MONO \
const double dVolL = v->dVolL; \
#define GET_VOL_RAMP \
dVolL = v->dVolL; \
dVolR = v->dVolR; \
#define GET_VOL_MONO_RAMP \
dVolL = v->dVolL; \
#define SET_VOL_BACK \
v->dVolL = dVolL; \
v->dVolR = dVolR; \
#define SET_VOL_BACK_MONO \
v->dVolL = v->dVolR = dVolL; \
#define GET_MIXER_VARS \
const uint64_t delta = v->delta; \
dMixBufferL = audio.dMixBufferL + bufferPos; \
dMixBufferR = audio.dMixBufferR + bufferPos; \
pos = v->pos; \
posFrac = v->posFrac; \
#define GET_MIXER_VARS_RAMP \
const uint64_t delta = v->delta; \
dMixBufferL = audio.dMixBufferL + bufferPos; \
dMixBufferR = audio.dMixBufferR + bufferPos; \
dVolLDelta = v->dVolDeltaL; \
dVolRDelta = v->dVolDeltaR; \
pos = v->pos; \
posFrac = v->posFrac; \
#define GET_MIXER_VARS_MONO_RAMP \
const uint64_t delta = v->delta; \
dMixBufferL = audio.dMixBufferL + bufferPos; \
dMixBufferR = audio.dMixBufferR + bufferPos; \
dVolLDelta = v->dVolDeltaL; \
pos = v->pos; \
posFrac = v->posFrac; \
#define PREPARE_TAP_FIX8 \
const int8_t *loopStartPtr = &v->base8[v->loopStart]; \
const int8_t *leftEdgePtr = loopStartPtr+SINC_LEFT_TAPS; \
#define PREPARE_TAP_FIX16 \
const int16_t *loopStartPtr = &v->base16[v->loopStart]; \
const int16_t *leftEdgePtr = loopStartPtr+SINC_LEFT_TAPS; \
#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 \
dVolL += dVolLDelta; \
dVolR += dVolRDelta; \
#define VOLUME_RAMPING_MONO \
dVolL += dVolLDelta; \
#define RENDER_8BIT_SMP \
assert(smpPtr >= base && smpPtr < base+v->end); \
dSample = *smpPtr * (1.0 / 128.0); \
*dMixBufferL++ += dSample * dVolL; \
*dMixBufferR++ += dSample * dVolR; \
#define RENDER_8BIT_SMP_MONO \
assert(smpPtr >= base && smpPtr < base+v->end); \
dSample = (*smpPtr * (1.0 / 128.0)) * dVolL; \
*dMixBufferL++ += dSample; \
*dMixBufferR++ += dSample; \
#define RENDER_16BIT_SMP \
assert(smpPtr >= base && smpPtr < base+v->end); \
dSample = *smpPtr * (1.0 / 32768.0); \
*dMixBufferL++ += dSample * dVolL; \
*dMixBufferR++ += dSample * dVolR; \
#define RENDER_16BIT_SMP_MONO \
assert(smpPtr >= base && smpPtr < base+v->end); \
dSample = (*smpPtr * (1.0 / 32768.0)) * dVolL; \
*dMixBufferL++ += dSample; \
*dMixBufferR++ += dSample; \
// 2-tap linear interpolation (like FT2)
#define LINEAR_INTERPOLATION(s, f, scale) \
{ \
/* uint32_t -> int32_t for less SIMD overhead when doing int->double conversion */ \
const int32_t frac = (uint32_t)(f) >> 1; /* (2^32)-1 -> (2^31)-1 */ \
\
const double dFrac = (double)(frac * (1.0 / (INT32_MAX+1.0))); /* 0.0 .. 0.999999999 */ \
dSample = ((s[0] + (s[1]-s[0]) * dFrac)) * (1.0 / scale); \
} \
#define RENDER_8BIT_SMP_LINTRP \
assert(smpPtr >= base && smpPtr < base+v->end); \
LINEAR_INTERPOLATION(smpPtr, posFrac, 128) \
*dMixBufferL++ += dSample * dVolL; \
*dMixBufferR++ += dSample * dVolR; \
#define RENDER_8BIT_SMP_MONO_LINTRP \
assert(smpPtr >= base && smpPtr < base+v->end); \
LINEAR_INTERPOLATION(smpPtr, posFrac, 128) \
dSample *= dVolL; \
*dMixBufferL++ += dSample; \
*dMixBufferR++ += dSample; \
#define RENDER_16BIT_SMP_LINTRP \
assert(smpPtr >= base && smpPtr < base+v->end); \
LINEAR_INTERPOLATION(smpPtr, posFrac, 32768) \
*dMixBufferL++ += dSample * dVolL; \
*dMixBufferR++ += dSample * dVolR; \
#define RENDER_16BIT_SMP_MONO_LINTRP \
assert(smpPtr >= base && smpPtr < base+v->end); \
LINEAR_INTERPOLATION(smpPtr, posFrac, 32768) \
dSample *= dVolL; \
*dMixBufferL++ += dSample; \
*dMixBufferR++ += dSample; \
// 8-tap windowed-sinc interpolation (better quality, through LUT: mixer/ft2_windowed_sinc.c)
/* 8bitbubsy: It may look like we are potentially going out of bounds while looking up the sample points,
** but the sample data is actually padded on both the left (negative) and right side, where correct tap
** samples are stored according to loop mode (or no loop).
**
** There is also a second special case for the left edge (negative taps) after the sample has looped once.
**
*/
#define WINDOWED_SINC_INTERPOLATION(s, f, scale) \
{ \
const double *t = v->dSincLUT + (((uint32_t)f >> SINC_FSHIFT) & SINC_FMASK); \
dSample = ((s[-3] * t[0]) + \
(s[-2] * t[1]) + \
(s[-1] * t[2]) + \
( s[0] * t[3]) + \
( s[1] * t[4]) + \
( s[2] * t[5]) + \
( s[3] * t[6]) + \
( s[4] * t[7])) * (1.0 / scale); \
} \
#define RENDER_8BIT_SMP_SINTRP \
assert(smpPtr >= base && smpPtr < base+v->end); \
WINDOWED_SINC_INTERPOLATION(smpPtr, posFrac, 128) \
*dMixBufferL++ += dSample * dVolL; \
*dMixBufferR++ += dSample * dVolR; \
#define RENDER_8BIT_SMP_MONO_SINTRP \
assert(smpPtr >= base && smpPtr < base+v->end); \
WINDOWED_SINC_INTERPOLATION(smpPtr, posFrac, 128) \
dSample *= dVolL; \
*dMixBufferL++ += dSample; \
*dMixBufferR++ += dSample; \
#define RENDER_16BIT_SMP_SINTRP \
assert(smpPtr >= base && smpPtr < base+v->end); \
WINDOWED_SINC_INTERPOLATION(smpPtr, posFrac, 32768) \
*dMixBufferL++ += dSample * dVolL; \
*dMixBufferR++ += dSample * dVolR; \
#define RENDER_16BIT_SMP_MONO_SINTRP \
assert(smpPtr >= base && smpPtr < base+v->end); \
WINDOWED_SINC_INTERPOLATION(smpPtr, posFrac, 32768) \
dSample *= dVolL; \
*dMixBufferL++ += dSample; \
*dMixBufferR++ += dSample; \
/* Special left-edge case mixers to get proper tap data after one loop cycle.
** These are only used with sinc interpolation on looped samples.
*/
#define RENDER_8BIT_SMP_SINTRP_TAP_FIX \
assert(smpPtr >= base && smpPtr < base+v->end); \
smpTapPtr = (smpPtr <= leftEdgePtr) ? (int8_t *)&v->leftEdgeTaps8[(int32_t)(smpPtr-loopStartPtr)] : (int8_t *)smpPtr; \
WINDOWED_SINC_INTERPOLATION(smpTapPtr, posFrac, 128) \
*dMixBufferL++ += dSample * dVolL; \
*dMixBufferR++ += dSample * dVolR; \
#define RENDER_8BIT_SMP_MONO_SINTRP_TAP_FIX \
assert(smpPtr >= base && smpPtr < base+v->end); \
smpTapPtr = (smpPtr <= leftEdgePtr) ? (int8_t *)&v->leftEdgeTaps8[(int32_t)(smpPtr-loopStartPtr)] : (int8_t *)smpPtr; \
WINDOWED_SINC_INTERPOLATION(smpTapPtr, posFrac, 128) \
dSample *= dVolL; \
*dMixBufferL++ += dSample; \
*dMixBufferR++ += dSample; \
#define RENDER_16BIT_SMP_SINTRP_TAP_FIX \
assert(smpPtr >= base && smpPtr < base+v->end); \
smpTapPtr = (smpPtr <= leftEdgePtr) ? (int16_t *)&v->leftEdgeTaps16[(int32_t)(smpPtr-loopStartPtr)] : (int16_t *)smpPtr; \
WINDOWED_SINC_INTERPOLATION(smpTapPtr, posFrac, 32768) \
*dMixBufferL++ += dSample * dVolL; \
*dMixBufferR++ += dSample * dVolR; \
#define RENDER_16BIT_SMP_MONO_SINTRP_TAP_FIX \
assert(smpPtr >= base && smpPtr < base+v->end); \
smpTapPtr = (smpPtr <= leftEdgePtr) ? (int16_t *)&v->leftEdgeTaps16[(int32_t)(smpPtr-loopStartPtr)] : (int16_t *)smpPtr; \
WINDOWED_SINC_INTERPOLATION(smpTapPtr, posFrac, 32768) \
dSample *= dVolL; \
*dMixBufferL++ += dSample; \
*dMixBufferR++ += dSample; \
/* ----------------------------------------------------------------------- */
/* SAMPLES-TO-MIX LIMITING MACROS */
/* ----------------------------------------------------------------------- */
#define LIMIT_MIX_NUM \
i = (v->end - 1) - pos; \
const uint64_t tmp64 = ((uint64_t)i << 32) | ((uint32_t)posFrac ^ 0xFFFFFFFF); \
\
samplesToMix = (uint32_t)(tmp64 / (uint64_t)v->delta) + 1; /* this can be slow on 32-bit systems... */ \
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) \
{ \
dVolLDelta = 0.0; \
dVolRDelta = 0.0; \
\
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) \
{ \
dVolLDelta = 0.0; \
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); \
if (pos >= v->end) \
{ \
do \
{ \
pos -= v->loopLength; \
} \
while (pos >= v->end); \
\
smpPtr = base + pos; \
\
v->hasLooped = true; \
} \
#define WRAP_BIDI_LOOP \
if (pos >= v->end) \
{ \
do \
{ \
pos -= v->loopLength; \
v->backwards ^= 1; \
} \
while (pos >= v->end); \
v->hasLooped = true; \
} \
#define END_BIDI \
if (v->backwards) \
{ \
posFrac ^= MIXER_FRAC_MASK; \
pos = ~(int32_t)(smpPtr - revBase); \
} \
else \
{ \
pos = (int32_t)(smpPtr - base); \
} \