ref: eaee288d876e3dd4e2fc0fa7ee9ab17bf8d1eb6c
dir: /src/ft2_mix_macros.h/
#pragma once
#include "ft2_header.h"
#include "ft2_audio.h"
/* ----------------------------------------------------------------------- */
/* GENERAL MIXER MACROS */
/* ----------------------------------------------------------------------- */
#define GET_VOL \
CDA_LVol = v->SLVol2; \
CDA_RVol = v->SRVol2; \
#define SET_VOL_BACK \
v->SLVol2 = CDA_LVol; \
v->SRVol2 = CDA_RVol; \
#if defined _WIN64 || defined __amd64__
#define GET_MIXER_VARS \
const uint64_t SFrq = v->SFrq; \
audioMixL = audio.mixBufferL; \
audioMixR = audio.mixBufferR; \
const bool mixInMono = (CDA_LVol == CDA_RVol); \
realPos = v->SPos; \
pos = v->SPosDec; \
#define GET_MIXER_VARS_RAMP \
const uint64_t SFrq = v->SFrq; \
audioMixL = audio.mixBufferL; \
audioMixR = audio.mixBufferR; \
CDA_LVolIP = v->SLVolIP; \
CDA_RVolIP = v->SRVolIP; \
const bool mixInMono = (v->SLVol2 == v->SRVol2) && (CDA_LVolIP == CDA_RVolIP); \
realPos = v->SPos; \
pos = v->SPosDec; \
#else
#define GET_MIXER_VARS \
const uint32_t SFrq = v->SFrq; \
audioMixL = audio.mixBufferL; \
audioMixR = audio.mixBufferR; \
const bool mixInMono = (CDA_LVol == CDA_RVol); \
realPos = v->SPos; \
pos = v->SPosDec; \
#define GET_MIXER_VARS_RAMP \
const uint32_t SFrq = v->SFrq; \
audioMixL = audio.mixBufferL; \
audioMixR = audio.mixBufferR; \
CDA_LVolIP = v->SLVolIP; \
CDA_RVolIP = v->SRVolIP; \
const bool mixInMono = (v->SLVol2 == v->SRVol2) && (CDA_LVolIP == CDA_RVolIP); \
realPos = v->SPos; \
pos = v->SPosDec; \
#endif
#define SET_BASE8 \
CDA_LinearAdr = v->SBase8; \
smpPtr = CDA_LinearAdr + realPos; \
#define SET_BASE16 \
CDA_LinearAdr = v->SBase16; \
smpPtr = CDA_LinearAdr + realPos; \
#define SET_BASE8_BIDI \
CDA_LinearAdr = v->SBase8; \
CDA_LinAdrRev = v->SRevBase8; \
#define SET_BASE16_BIDI \
CDA_LinearAdr = v->SBase16; \
CDA_LinAdrRev = v->SRevBase16; \
#define INC_POS \
pos += SFrq; \
smpPtr += pos >> MIXER_FRAC_BITS; \
pos &= MIXER_FRAC_MASK; \
#define INC_POS_BIDI \
pos += CDA_IPValL; \
smpPtr += pos >> MIXER_FRAC_BITS; \
smpPtr += CDA_IPValH; \
pos &= MIXER_FRAC_MASK; \
#define SET_BACK_MIXER_POS \
v->SPosDec = pos; \
v->SPos = realPos; \
/* ----------------------------------------------------------------------- */
/* SAMPLE RENDERING MACROS */
/* ----------------------------------------------------------------------- */
#define VOLUME_RAMPING \
CDA_LVol += CDA_LVolIP; \
CDA_RVol += CDA_RVolIP; \
// all the 64-bit MULs here convert to fast logic on most 32-bit CPUs
#define RENDER_8BIT_SMP \
assert(smpPtr >= CDA_LinearAdr && smpPtr < CDA_LinearAdr+v->SLen); \
sample = *smpPtr << 20; \
*audioMixL++ += ((int64_t)sample * CDA_LVol) >> 32; \
*audioMixR++ += ((int64_t)sample * CDA_RVol) >> 32; \
#define RENDER_8BIT_SMP_MONO \
assert(smpPtr >= CDA_LinearAdr && smpPtr < CDA_LinearAdr+v->SLen); \
sample = *smpPtr << 20; \
sample = ((int64_t)sample * CDA_LVol) >> 32; \
*audioMixL++ += sample; \
*audioMixR++ += sample; \
#define RENDER_16BIT_SMP \
assert(smpPtr >= CDA_LinearAdr && smpPtr < CDA_LinearAdr+v->SLen); \
sample = *smpPtr << 12; \
*audioMixL++ += ((int64_t)sample * CDA_LVol) >> 32; \
*audioMixR++ += ((int64_t)sample * CDA_RVol) >> 32; \
#define RENDER_16BIT_SMP_MONO \
assert(smpPtr >= CDA_LinearAdr && smpPtr < CDA_LinearAdr+v->SLen); \
sample = *smpPtr << 12; \
sample = ((int64_t)sample * CDA_LVol) >> 32; \
*audioMixL++ += sample; \
*audioMixR++ += sample; \
// 4-tap cubic spline interpolation
// in: int32_t s0,s1,s2,s3 = -128..127 | f = 0..65535 (frac) | out: 16-bit s0 (will exceed 16-bits because of overshoot)
#define INTERPOLATE8(s0, s1, s2, s3, f) \
{ \
const int16_t *t = cubicSplineTable + ((f >> CUBIC_FSHIFT) & CUBIC_FMASK); \
s0 = ((s0 * t[0]) + (s1 * t[1]) + (s2 * t[2]) + (s3 * t[3])) >> (CUBIC_QUANTSHIFT-8); \
} \
// in: int32_t s0,s1,s2,s3 = -32768..32767 | f = 0..65535 (frac) | out: 16-bit s0 (will exceed 16-bits because of overshoot)
#define INTERPOLATE16(s0, s1, s2, s3, f) \
{ \
const int16_t *t = cubicSplineTable + ((f >> CUBIC_FSHIFT) & CUBIC_FMASK); \
s0 = ((s0 * t[0]) + (s1 * t[1]) + (s2 * t[2]) + (s3 * t[3])) >> CUBIC_QUANTSHIFT; \
} \
/* 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 >= CDA_LinearAdr && smpPtr < CDA_LinearAdr+v->SLen); \
sample = smpPtr[-1]; \
sample2 = smpPtr[0]; \
sample3 = smpPtr[1]; \
sample4 = smpPtr[2]; \
INTERPOLATE8(sample, sample2, sample3, sample4, pos) \
sample <<= 12; \
*audioMixL++ += ((int64_t)sample * CDA_LVol) >> 32; \
*audioMixR++ += ((int64_t)sample * CDA_RVol) >> 32; \
#define RENDER_8BIT_SMP_MONO_INTRP \
assert(smpPtr >= CDA_LinearAdr && smpPtr < CDA_LinearAdr+v->SLen); \
sample = smpPtr[-1]; \
sample2 = smpPtr[0]; \
sample3 = smpPtr[1]; \
sample4 = smpPtr[2]; \
INTERPOLATE8(sample, sample2, sample3, sample4, pos) \
sample <<= 12; \
sample = ((int64_t)sample * CDA_LVol) >> 32; \
*audioMixL++ += sample; \
*audioMixR++ += sample; \
#define RENDER_16BIT_SMP_INTRP \
assert(smpPtr >= CDA_LinearAdr && smpPtr < CDA_LinearAdr+v->SLen); \
sample = smpPtr[-1]; \
sample2 = smpPtr[0]; \
sample3 = smpPtr[1]; \
sample4 = smpPtr[2]; \
INTERPOLATE16(sample, sample2, sample3, sample4, pos) \
sample <<= 12; \
*audioMixL++ += ((int64_t)sample * CDA_LVol) >> 32; \
*audioMixR++ += ((int64_t)sample * CDA_RVol) >> 32; \
#define RENDER_16BIT_SMP_MONO_INTRP \
assert(smpPtr >= CDA_LinearAdr && smpPtr < CDA_LinearAdr+v->SLen); \
sample = smpPtr[-1]; \
sample2 = smpPtr[0]; \
sample3 = smpPtr[1]; \
sample4 = smpPtr[2]; \
INTERPOLATE16(sample, sample2, sample3, sample4, pos) \
sample <<= 12; \
sample = ((int64_t)sample * CDA_LVol) >> 32; \
*audioMixL++ += sample; \
*audioMixR++ += sample; \
/* ----------------------------------------------------------------------- */
/* SAMPLES-TO-MIX LIMITING MACROS */
/* ----------------------------------------------------------------------- */
#if defined _WIN64 || defined __amd64__
#define LIMIT_MIX_NUM \
samplesToMix = CDA_BytesLeft; \
i = (v->SLen - 1) - realPos; \
\
if (SFrq > 0) \
{ \
uint64_t tmp64 = ((uint64_t)i << MIXER_FRAC_BITS) | (pos ^ MIXER_FRAC_MASK); \
samplesToMix = (uint32_t)(tmp64 / SFrq) + 1; \
if (samplesToMix > CDA_BytesLeft) \
samplesToMix = CDA_BytesLeft; \
} \
\
#define START_BIDI \
if (v->backwards) \
{ \
delta = 0 - SFrq; \
assert(realPos >= v->SRepS && realPos < v->SLen); \
realPos = ~realPos; \
smpPtr = CDA_LinAdrRev + realPos; \
pos ^= MIXER_FRAC_MASK; \
} \
else \
{ \
delta = SFrq; \
assert(realPos >= 0 && realPos < v->SLen); \
smpPtr = CDA_LinearAdr + realPos; \
} \
\
const int32_t CDA_IPValH = (int64_t)delta >> MIXER_FRAC_BITS; \
const uint32_t CDA_IPValL = delta & MIXER_FRAC_MASK; \
#else
#define LIMIT_MIX_NUM \
i = (v->SLen - 1) - realPos; \
if (i > (1UL << (32-MIXER_FRAC_BITS))) \
i = 1UL << (32-MIXER_FRAC_BITS); \
\
i = (i << MIXER_FRAC_BITS) | (pos ^ MIXER_FRAC_MASK); \
samplesToMix = ((int64_t)i * v->SFrqRev) >> 32; \
samplesToMix++; \
\
if (samplesToMix > CDA_BytesLeft) \
samplesToMix = CDA_BytesLeft; \
#define START_BIDI \
if (v->backwards) \
{ \
delta = 0 - SFrq; \
assert(realPos >= v->SRepS && realPos < v->SLen); \
realPos = ~realPos; \
smpPtr = CDA_LinAdrRev + realPos; \
pos ^= MIXER_FRAC_MASK; \
} \
else \
{ \
delta = SFrq; \
assert(realPos >= 0 && realPos < v->SLen); \
smpPtr = CDA_LinearAdr + realPos; \
} \
\
const int32_t CDA_IPValH = (int32_t)delta >> MIXER_FRAC_BITS; \
const uint32_t CDA_IPValL = delta & MIXER_FRAC_MASK; \
#endif
#define LIMIT_MIX_NUM_RAMP \
if (v->SVolIPLen == 0) \
{ \
CDA_LVolIP = 0; \
CDA_RVolIP = 0; \
\
if (v->isFadeOutVoice) \
{ \
v->mixRoutine = NULL; /* fade out voice is done, shut it down */ \
return; \
} \
} \
else \
{ \
if (samplesToMix > v->SVolIPLen) \
samplesToMix = v->SVolIPLen; \
\
v->SVolIPLen -= samplesToMix; \
} \
#define HANDLE_SAMPLE_END \
realPos = (int32_t)(smpPtr - CDA_LinearAdr); \
if (realPos >= v->SLen) \
{ \
v->mixRoutine = NULL; \
return; \
} \
#define WRAP_LOOP \
realPos = (int32_t)(smpPtr - CDA_LinearAdr); \
while (realPos >= v->SLen) \
realPos -= v->SRepL; \
smpPtr = CDA_LinearAdr + realPos; \
#define WRAP_BIDI_LOOP \
while (realPos >= v->SLen) \
{ \
realPos -= v->SRepL; \
v->backwards ^= 1; \
} \
#define END_BIDI \
if (v->backwards) \
{ \
pos ^= MIXER_FRAC_MASK; \
realPos = ~(int32_t)(smpPtr - CDA_LinAdrRev); \
} \
else \
{ \
realPos = (int32_t)(smpPtr - CDA_LinearAdr); \
} \
\
/* ----------------------------------------------------------------------- */
/* VOLUME=0 MIXING MACROS */
/* ----------------------------------------------------------------------- */
#if defined _WIN64 || defined __amd64__
#define VOL0_INC_POS \
const uint64_t newPos = v->SFrq * (uint64_t)numSamples; \
const uint32_t addPos = (uint32_t)(newPos >> MIXER_FRAC_BITS); \
uint64_t addFrac = newPos & MIXER_FRAC_MASK; \
\
addFrac += v->SPosDec; \
realPos = v->SPos + addPos + (uint32_t)(addFrac >> MIXER_FRAC_BITS); \
pos = addFrac & MIXER_FRAC_MASK; \
#define VOL0_MIXING_NO_LOOP \
VOL0_INC_POS \
if (realPos >= v->SLen) \
{ \
v->mixRoutine = NULL; /* shut down voice */ \
return; \
} \
\
SET_BACK_MIXER_POS
#define VOL0_MIXING_LOOP \
VOL0_INC_POS \
if (realPos >= v->SLen) \
{ \
if (v->SRepL >= 2) \
realPos = v->SRepS + ((realPos - v->SLen) % v->SRepL); \
else \
realPos = v->SRepS; \
} \
\
SET_BACK_MIXER_POS
#define VOL0_MIXING_BIDI_LOOP \
VOL0_INC_POS \
if (realPos >= v->SLen) \
{ \
if (v->SRepL >= 2) \
{ \
const int32_t overflow = realPos - v->SLen; \
const int32_t cycles = overflow / v->SRepL; \
const int32_t phase = overflow % v->SRepL; \
\
realPos = v->SRepS + phase; \
v->backwards ^= !(cycles & 1); \
} \
else \
{ \
realPos = v->SRepS; \
} \
} \
\
SET_BACK_MIXER_POS
#else
#define VOL0_INC_POS \
assert(numSamples <= 65536); \
\
pos = v->SPosDec + ((v->SFrq & 0xFFFF) * numSamples); \
realPos = v->SPos + ((v->SFrq >> 16) * numSamples) + (pos >> 16); \
pos &= 0xFFFF; \
#define VOL0_MIXING_NO_LOOP \
VOL0_INC_POS \
if (realPos >= v->SLen) \
{ \
v->mixRoutine = NULL; /* shut down voice */ \
return; \
} \
\
SET_BACK_MIXER_POS
#define VOL0_MIXING_LOOP \
VOL0_INC_POS \
\
while (realPos >= v->SLen) \
realPos -= v->SRepL; \
\
SET_BACK_MIXER_POS
#define VOL0_MIXING_BIDI_LOOP \
VOL0_INC_POS \
while (realPos >= v->SLen) \
{ \
realPos -= v->SRepL; \
v->backwards ^= 1; \
} \
\
SET_BACK_MIXER_POS
#endif