ref: f9a6d630fb4df6a523df9e08d18c6cb71f103d85
dir: /src/mixer/ft2_mix.c/
#include <stdint.h>
#include <stdbool.h>
#include "ft2_mix.h"
#include "ft2_mix_macros.h"
#include "ft2_center_mix.h"
/*
** -------------------- floating point audio channel mixer ---------------------
** (Note: Mixing macros can be found in ft2_mix_macros.h)
**
** Specifications:
** - Fast 4-tap cubic interpolation through 32-bit float LUT (optional)
** - Linear volume ramping, matching FT2 (optional)
** - 32.32 fixed-point logic for position delta
** - 32-bit float logic for volumes/amplitudes
**
** This file has separate routines for EVERY possible sampling variation:
** Interpolation on/off, volumeramp on/off, 8-bit, 16-bit, no loop, loop, bidi.
** (24 mixing routines in total + another 24 for center-mixing)
**
** Every voice has a function pointer set to the according mixing routine on
** sample trigger (from replayer, but set in audio thread), using a function
** pointer look-up table. All voices & pointers are always thread-safely cleared
** when changing any of the above attributes from the GUI, to prevent possible
** thread-related issues.
**
** There's one problem with the 4-tap cubic spline resampling interpolation...
** On looped samples where loopStart>0, the splines are not correct when reading
** from the loopStart (or +1?) sample point. The difference in audio is very
** minor, so it's not a big problem. It just has to stay like this the way the
** mixer works. In cases where loopStart=0, the sample before index 0 (yes, we
** allocate enough data and pre-increment main pointer to support negative
** look-up), is already pre-fixed so that the splines will be correct.
** -----------------------------------------------------------------------------
*/
/* ----------------------------------------------------------------------- */
/* 8-BIT MIXING ROUTINES */
/* ----------------------------------------------------------------------- */
static void mix8bNoLoop(voice_t *v, uint32_t numSamples)
{
const int8_t *base, *smpPtr;
float fSample, *fMixBufferL, *fMixBufferR;
int32_t pos;
uint32_t i, samplesToMix, samplesLeft;
uint64_t posFrac;
GET_VOL
GET_MIXER_VARS
SET_BASE8
samplesLeft = numSamples;
while (samplesLeft > 0)
{
LIMIT_MIX_NUM
samplesLeft -= samplesToMix;
for (i = 0; i < (samplesToMix & 3); i++)
{
RENDER_8BIT_SMP
INC_POS
}
samplesToMix >>= 2;
for (i = 0; i < samplesToMix; i++)
{
RENDER_8BIT_SMP
INC_POS
RENDER_8BIT_SMP
INC_POS
RENDER_8BIT_SMP
INC_POS
RENDER_8BIT_SMP
INC_POS
}
HANDLE_SAMPLE_END
}
SET_BACK_MIXER_POS
}
static void mix8bLoop(voice_t *v, uint32_t numSamples)
{
const int8_t *base, *smpPtr;
float fSample, *fMixBufferL, *fMixBufferR;
int32_t pos;
uint32_t i, samplesToMix, samplesLeft;
uint64_t posFrac;
GET_VOL
GET_MIXER_VARS
SET_BASE8
samplesLeft = numSamples;
while (samplesLeft > 0)
{
LIMIT_MIX_NUM
samplesLeft -= samplesToMix;
for (i = 0; i < (samplesToMix & 3); i++)
{
RENDER_8BIT_SMP
INC_POS
}
samplesToMix >>= 2;
for (i = 0; i < samplesToMix; i++)
{
RENDER_8BIT_SMP
INC_POS
RENDER_8BIT_SMP
INC_POS
RENDER_8BIT_SMP
INC_POS
RENDER_8BIT_SMP
INC_POS
}
WRAP_LOOP
}
SET_BACK_MIXER_POS
}
static void mix8bBidiLoop(voice_t *v, uint32_t numSamples)
{
const int8_t *base, *revBase, *smpPtr;
float fSample, *fMixBufferL, *fMixBufferR;
int32_t pos;
uint32_t i, samplesToMix, samplesLeft;
uint64_t posFrac, tmpDelta;
GET_VOL
GET_MIXER_VARS
SET_BASE8_BIDI
samplesLeft = numSamples;
while (samplesLeft > 0)
{
LIMIT_MIX_NUM
samplesLeft -= samplesToMix;
START_BIDI
for (i = 0; i < (samplesToMix & 3); i++)
{
RENDER_8BIT_SMP
INC_POS_BIDI
}
samplesToMix >>= 2;
for (i = 0; i < samplesToMix; i++)
{
RENDER_8BIT_SMP
INC_POS_BIDI
RENDER_8BIT_SMP
INC_POS_BIDI
RENDER_8BIT_SMP
INC_POS_BIDI
RENDER_8BIT_SMP
INC_POS_BIDI
}
END_BIDI
WRAP_BIDI_LOOP
}
SET_BACK_MIXER_POS
}
static void mix8bNoLoopIntrp(voice_t *v, uint32_t numSamples)
{
const int8_t *base, *smpPtr;
float fSample, fSample2, fSample3, fSample4, *fMixBufferL, *fMixBufferR;
int32_t pos;
uint32_t i, samplesToMix, samplesLeft;
uint64_t posFrac;
GET_VOL
GET_MIXER_VARS
SET_BASE8
samplesLeft = numSamples;
while (samplesLeft > 0)
{
LIMIT_MIX_NUM
samplesLeft -= samplesToMix;
for (i = 0; i < (samplesToMix & 3); i++)
{
RENDER_8BIT_SMP_INTRP
INC_POS
}
samplesToMix >>= 2;
for (i = 0; i < samplesToMix; i++)
{
RENDER_8BIT_SMP_INTRP
INC_POS
RENDER_8BIT_SMP_INTRP
INC_POS
RENDER_8BIT_SMP_INTRP
INC_POS
RENDER_8BIT_SMP_INTRP
INC_POS
}
HANDLE_SAMPLE_END
}
SET_BACK_MIXER_POS
}
static void mix8bLoopIntrp(voice_t *v, uint32_t numSamples)
{
const int8_t *base, *smpPtr;
float fSample, fSample2, fSample3, fSample4, *fMixBufferL, *fMixBufferR;
int32_t pos;
uint32_t i, samplesToMix, samplesLeft;
uint64_t posFrac;
GET_VOL
GET_MIXER_VARS
SET_BASE8
samplesLeft = numSamples;
while (samplesLeft > 0)
{
LIMIT_MIX_NUM
samplesLeft -= samplesToMix;
for (i = 0; i < (samplesToMix & 3); i++)
{
RENDER_8BIT_SMP_INTRP
INC_POS
}
samplesToMix >>= 2;
for (i = 0; i < samplesToMix; i++)
{
RENDER_8BIT_SMP_INTRP
INC_POS
RENDER_8BIT_SMP_INTRP
INC_POS
RENDER_8BIT_SMP_INTRP
INC_POS
RENDER_8BIT_SMP_INTRP
INC_POS
}
WRAP_LOOP
}
SET_BACK_MIXER_POS
}
static void mix8bBidiLoopIntrp(voice_t *v, uint32_t numSamples)
{
const int8_t *base, *revBase, *smpPtr;
float fSample, fSample2, fSample3, fSample4, *fMixBufferL, *fMixBufferR;
int32_t pos;
uint32_t i, samplesToMix, samplesLeft;
uint64_t posFrac, tmpDelta;
GET_VOL
GET_MIXER_VARS
SET_BASE8_BIDI
samplesLeft = numSamples;
while (samplesLeft > 0)
{
LIMIT_MIX_NUM
samplesLeft -= samplesToMix;
START_BIDI
for (i = 0; i < (samplesToMix & 3); i++)
{
RENDER_8BIT_SMP_INTRP
INC_POS_BIDI
}
samplesToMix >>= 2;
for (i = 0; i < samplesToMix; i++)
{
RENDER_8BIT_SMP_INTRP
INC_POS_BIDI
RENDER_8BIT_SMP_INTRP
INC_POS_BIDI
RENDER_8BIT_SMP_INTRP
INC_POS_BIDI
RENDER_8BIT_SMP_INTRP
INC_POS_BIDI
}
END_BIDI
WRAP_BIDI_LOOP
}
SET_BACK_MIXER_POS
}
static void mix8bRampNoLoop(voice_t *v, uint32_t numSamples)
{
const int8_t *base, *smpPtr;
float fSample, *fMixBufferL, *fMixBufferR;
int32_t pos;
float fVolLDelta, fVolRDelta, fVolL, fVolR;
uint32_t i, samplesToMix, samplesLeft;
uint64_t posFrac;
GET_VOL_RAMP
GET_MIXER_VARS_RAMP
SET_BASE8
samplesLeft = numSamples;
while (samplesLeft > 0)
{
LIMIT_MIX_NUM
LIMIT_MIX_NUM_RAMP
samplesLeft -= samplesToMix;
for (i = 0; i < (samplesToMix & 3); i++)
{
RENDER_8BIT_SMP
VOLUME_RAMPING
INC_POS
}
samplesToMix >>= 2;
for (i = 0; i < samplesToMix; i++)
{
RENDER_8BIT_SMP
VOLUME_RAMPING
INC_POS
RENDER_8BIT_SMP
VOLUME_RAMPING
INC_POS
RENDER_8BIT_SMP
VOLUME_RAMPING
INC_POS
RENDER_8BIT_SMP
VOLUME_RAMPING
INC_POS
}
HANDLE_SAMPLE_END
}
SET_VOL_BACK
SET_BACK_MIXER_POS
}
static void mix8bRampLoop(voice_t *v, uint32_t numSamples)
{
const int8_t *base, *smpPtr;
float fSample, *fMixBufferL, *fMixBufferR;
int32_t pos;
float fVolLDelta, fVolRDelta, fVolL, fVolR;
uint32_t i, samplesToMix, samplesLeft;
uint64_t posFrac;
GET_VOL_RAMP
GET_MIXER_VARS_RAMP
SET_BASE8
samplesLeft = numSamples;
while (samplesLeft > 0)
{
LIMIT_MIX_NUM
LIMIT_MIX_NUM_RAMP
samplesLeft -= samplesToMix;
for (i = 0; i < (samplesToMix & 3); i++)
{
RENDER_8BIT_SMP
VOLUME_RAMPING
INC_POS
}
samplesToMix >>= 2;
for (i = 0; i < samplesToMix; i++)
{
RENDER_8BIT_SMP
VOLUME_RAMPING
INC_POS
RENDER_8BIT_SMP
VOLUME_RAMPING
INC_POS
RENDER_8BIT_SMP
VOLUME_RAMPING
INC_POS
RENDER_8BIT_SMP
VOLUME_RAMPING
INC_POS
}
WRAP_LOOP
}
SET_VOL_BACK
SET_BACK_MIXER_POS
}
static void mix8bRampBidiLoop(voice_t *v, uint32_t numSamples)
{
const int8_t *base, *revBase, *smpPtr;
float fSample, *fMixBufferL, *fMixBufferR;
int32_t pos;
float fVolLDelta, fVolRDelta, fVolL, fVolR;
uint32_t i, samplesToMix, samplesLeft;
uint64_t posFrac, tmpDelta;
GET_VOL_RAMP
GET_MIXER_VARS_RAMP
SET_BASE8_BIDI
samplesLeft = numSamples;
while (samplesLeft > 0)
{
LIMIT_MIX_NUM
LIMIT_MIX_NUM_RAMP
samplesLeft -= samplesToMix;
START_BIDI
for (i = 0; i < (samplesToMix & 3); i++)
{
RENDER_8BIT_SMP
VOLUME_RAMPING
INC_POS_BIDI
}
samplesToMix >>= 2;
for (i = 0; i < samplesToMix; i++)
{
RENDER_8BIT_SMP
VOLUME_RAMPING
INC_POS_BIDI
RENDER_8BIT_SMP
VOLUME_RAMPING
INC_POS_BIDI
RENDER_8BIT_SMP
VOLUME_RAMPING
INC_POS_BIDI
RENDER_8BIT_SMP
VOLUME_RAMPING
INC_POS_BIDI
}
END_BIDI
WRAP_BIDI_LOOP
}
SET_VOL_BACK
SET_BACK_MIXER_POS
}
static void mix8bRampNoLoopIntrp(voice_t *v, uint32_t numSamples)
{
const int8_t *base, *smpPtr;
float fSample, fSample2, fSample3, fSample4, *fMixBufferL, *fMixBufferR;
int32_t pos;
float fVolLDelta, fVolRDelta, fVolL, fVolR;
uint32_t i, samplesToMix, samplesLeft;
uint64_t posFrac;
GET_VOL_RAMP
GET_MIXER_VARS_RAMP
SET_BASE8
samplesLeft = numSamples;
while (samplesLeft > 0)
{
LIMIT_MIX_NUM
LIMIT_MIX_NUM_RAMP
samplesLeft -= samplesToMix;
for (i = 0; i < (samplesToMix & 3); i++)
{
RENDER_8BIT_SMP_INTRP
VOLUME_RAMPING
INC_POS
}
samplesToMix >>= 2;
for (i = 0; i < samplesToMix; i++)
{
RENDER_8BIT_SMP_INTRP
VOLUME_RAMPING
INC_POS
RENDER_8BIT_SMP_INTRP
VOLUME_RAMPING
INC_POS
RENDER_8BIT_SMP_INTRP
VOLUME_RAMPING
INC_POS
RENDER_8BIT_SMP_INTRP
VOLUME_RAMPING
INC_POS
}
HANDLE_SAMPLE_END
}
SET_VOL_BACK
SET_BACK_MIXER_POS
}
static void mix8bRampLoopIntrp(voice_t *v, uint32_t numSamples)
{
const int8_t *base, *smpPtr;
float fSample, fSample2, fSample3, fSample4, *fMixBufferL, *fMixBufferR;
int32_t pos;
float fVolLDelta, fVolRDelta, fVolL, fVolR;
uint32_t i, samplesToMix, samplesLeft;
uint64_t posFrac;
GET_VOL_RAMP
GET_MIXER_VARS_RAMP
SET_BASE8
samplesLeft = numSamples;
while (samplesLeft > 0)
{
LIMIT_MIX_NUM
LIMIT_MIX_NUM_RAMP
samplesLeft -= samplesToMix;
for (i = 0; i < (samplesToMix & 3); i++)
{
RENDER_8BIT_SMP_INTRP
VOLUME_RAMPING
INC_POS
}
samplesToMix >>= 2;
for (i = 0; i < samplesToMix; i++)
{
RENDER_8BIT_SMP_INTRP
VOLUME_RAMPING
INC_POS
RENDER_8BIT_SMP_INTRP
VOLUME_RAMPING
INC_POS
RENDER_8BIT_SMP_INTRP
VOLUME_RAMPING
INC_POS
RENDER_8BIT_SMP_INTRP
VOLUME_RAMPING
INC_POS
}
WRAP_LOOP
}
SET_VOL_BACK
SET_BACK_MIXER_POS
}
static void mix8bRampBidiLoopIntrp(voice_t *v, uint32_t numSamples)
{
const int8_t *base, *revBase, *smpPtr;
float fSample, fSample2, fSample3, fSample4, *fMixBufferL, *fMixBufferR;
int32_t pos;
float fVolLDelta, fVolRDelta, fVolL, fVolR;
uint32_t i, samplesToMix, samplesLeft;
uint64_t posFrac, tmpDelta;
GET_VOL_RAMP
GET_MIXER_VARS_RAMP
SET_BASE8_BIDI
samplesLeft = numSamples;
while (samplesLeft > 0)
{
LIMIT_MIX_NUM
LIMIT_MIX_NUM_RAMP
samplesLeft -= samplesToMix;
START_BIDI
for (i = 0; i < (samplesToMix & 3); i++)
{
RENDER_8BIT_SMP_INTRP
VOLUME_RAMPING
INC_POS_BIDI
}
samplesToMix >>= 2;
for (i = 0; i < samplesToMix; i++)
{
RENDER_8BIT_SMP_INTRP
VOLUME_RAMPING
INC_POS_BIDI
RENDER_8BIT_SMP_INTRP
VOLUME_RAMPING
INC_POS_BIDI
RENDER_8BIT_SMP_INTRP
VOLUME_RAMPING
INC_POS_BIDI
RENDER_8BIT_SMP_INTRP
VOLUME_RAMPING
INC_POS_BIDI
}
END_BIDI
WRAP_BIDI_LOOP
}
SET_VOL_BACK
SET_BACK_MIXER_POS
}
/* ----------------------------------------------------------------------- */
/* 16-BIT MIXING ROUTINES */
/* ----------------------------------------------------------------------- */
static void mix16bNoLoop(voice_t *v, uint32_t numSamples)
{
const int16_t *base, *smpPtr;
float fSample, *fMixBufferL, *fMixBufferR;
int32_t pos;
uint32_t i, samplesToMix, samplesLeft;
uint64_t posFrac;
GET_VOL
GET_MIXER_VARS
SET_BASE16
samplesLeft = numSamples;
while (samplesLeft > 0)
{
LIMIT_MIX_NUM
samplesLeft -= samplesToMix;
for (i = 0; i < (samplesToMix & 3); i++)
{
RENDER_16BIT_SMP
INC_POS
}
samplesToMix >>= 2;
for (i = 0; i < samplesToMix; i++)
{
RENDER_16BIT_SMP
INC_POS
RENDER_16BIT_SMP
INC_POS
RENDER_16BIT_SMP
INC_POS
RENDER_16BIT_SMP
INC_POS
}
HANDLE_SAMPLE_END
}
SET_BACK_MIXER_POS
}
static void mix16bLoop(voice_t *v, uint32_t numSamples)
{
const int16_t *base, *smpPtr;
float fSample, *fMixBufferL, *fMixBufferR;
int32_t pos;
uint32_t i, samplesToMix, samplesLeft;
uint64_t posFrac;
GET_VOL
GET_MIXER_VARS
SET_BASE16
samplesLeft = numSamples;
while (samplesLeft > 0)
{
LIMIT_MIX_NUM
samplesLeft -= samplesToMix;
for (i = 0; i < (samplesToMix & 3); i++)
{
RENDER_16BIT_SMP
INC_POS
}
samplesToMix >>= 2;
for (i = 0; i < samplesToMix; i++)
{
RENDER_16BIT_SMP
INC_POS
RENDER_16BIT_SMP
INC_POS
RENDER_16BIT_SMP
INC_POS
RENDER_16BIT_SMP
INC_POS
}
WRAP_LOOP
}
SET_BACK_MIXER_POS
}
static void mix16bBidiLoop(voice_t *v, uint32_t numSamples)
{
const int16_t *base, *revBase, *smpPtr;
float fSample, *fMixBufferL, *fMixBufferR;
int32_t pos;
uint32_t i, samplesToMix, samplesLeft;
uint64_t posFrac, tmpDelta;
GET_VOL
GET_MIXER_VARS
SET_BASE16_BIDI
samplesLeft = numSamples;
while (samplesLeft > 0)
{
LIMIT_MIX_NUM
samplesLeft -= samplesToMix;
START_BIDI
for (i = 0; i < (samplesToMix & 3); i++)
{
RENDER_16BIT_SMP
INC_POS_BIDI
}
samplesToMix >>= 2;
for (i = 0; i < samplesToMix; i++)
{
RENDER_16BIT_SMP
INC_POS_BIDI
RENDER_16BIT_SMP
INC_POS_BIDI
RENDER_16BIT_SMP
INC_POS_BIDI
RENDER_16BIT_SMP
INC_POS_BIDI
}
END_BIDI
WRAP_BIDI_LOOP
}
SET_BACK_MIXER_POS
}
static void mix16bNoLoopIntrp(voice_t *v, uint32_t numSamples)
{
const int16_t *base, *smpPtr;
float fSample, fSample2, fSample3, fSample4, *fMixBufferL, *fMixBufferR;
int32_t pos;
uint32_t i, samplesToMix, samplesLeft;
uint64_t posFrac;
GET_VOL
GET_MIXER_VARS
SET_BASE16
samplesLeft = numSamples;
while (samplesLeft > 0)
{
LIMIT_MIX_NUM
samplesLeft -= samplesToMix;
for (i = 0; i < (samplesToMix & 3); i++)
{
RENDER_16BIT_SMP_INTRP
INC_POS
}
samplesToMix >>= 2;
for (i = 0; i < samplesToMix; i++)
{
RENDER_16BIT_SMP_INTRP
INC_POS
RENDER_16BIT_SMP_INTRP
INC_POS
RENDER_16BIT_SMP_INTRP
INC_POS
RENDER_16BIT_SMP_INTRP
INC_POS
}
HANDLE_SAMPLE_END
}
SET_BACK_MIXER_POS
}
static void mix16bLoopIntrp(voice_t *v, uint32_t numSamples)
{
const int16_t *base, *smpPtr;
float fSample, fSample2, fSample3, fSample4, *fMixBufferL, *fMixBufferR;
int32_t pos;
uint32_t i, samplesToMix, samplesLeft;
uint64_t posFrac;
GET_VOL
GET_MIXER_VARS
SET_BASE16
samplesLeft = numSamples;
while (samplesLeft > 0)
{
LIMIT_MIX_NUM
samplesLeft -= samplesToMix;
for (i = 0; i < (samplesToMix & 3); i++)
{
RENDER_16BIT_SMP_INTRP
INC_POS
}
samplesToMix >>= 2;
for (i = 0; i < samplesToMix; i++)
{
RENDER_16BIT_SMP_INTRP
INC_POS
RENDER_16BIT_SMP_INTRP
INC_POS
RENDER_16BIT_SMP_INTRP
INC_POS
RENDER_16BIT_SMP_INTRP
INC_POS
}
WRAP_LOOP
}
SET_BACK_MIXER_POS
}
static void mix16bBidiLoopIntrp(voice_t *v, uint32_t numSamples)
{
const int16_t *base, *revBase, *smpPtr;
float fSample, fSample2, fSample3, fSample4, *fMixBufferL, *fMixBufferR;
int32_t pos;
uint32_t i, samplesToMix, samplesLeft;
uint64_t posFrac, tmpDelta;
GET_VOL
GET_MIXER_VARS
SET_BASE16_BIDI
samplesLeft = numSamples;
while (samplesLeft > 0)
{
LIMIT_MIX_NUM
samplesLeft -= samplesToMix;
START_BIDI
for (i = 0; i < (samplesToMix & 3); i++)
{
RENDER_16BIT_SMP_INTRP
INC_POS_BIDI
}
samplesToMix >>= 2;
for (i = 0; i < samplesToMix; i++)
{
RENDER_16BIT_SMP_INTRP
INC_POS_BIDI
RENDER_16BIT_SMP_INTRP
INC_POS_BIDI
RENDER_16BIT_SMP_INTRP
INC_POS_BIDI
RENDER_16BIT_SMP_INTRP
INC_POS_BIDI
}
END_BIDI
WRAP_BIDI_LOOP
}
SET_BACK_MIXER_POS
}
static void mix16bRampNoLoop(voice_t *v, uint32_t numSamples)
{
const int16_t *base, *smpPtr;
float fSample, *fMixBufferL, *fMixBufferR;
int32_t pos;
float fVolLDelta, fVolRDelta, fVolL, fVolR;
uint32_t i, samplesToMix, samplesLeft;
uint64_t posFrac;
GET_VOL_RAMP
GET_MIXER_VARS_RAMP
SET_BASE16
samplesLeft = numSamples;
while (samplesLeft > 0)
{
LIMIT_MIX_NUM
LIMIT_MIX_NUM_RAMP
samplesLeft -= samplesToMix;
for (i = 0; i < (samplesToMix & 3); i++)
{
RENDER_16BIT_SMP
VOLUME_RAMPING
INC_POS
}
samplesToMix >>= 2;
for (i = 0; i < samplesToMix; i++)
{
RENDER_16BIT_SMP
VOLUME_RAMPING
INC_POS
RENDER_16BIT_SMP
VOLUME_RAMPING
INC_POS
RENDER_16BIT_SMP
VOLUME_RAMPING
INC_POS
RENDER_16BIT_SMP
VOLUME_RAMPING
INC_POS
}
HANDLE_SAMPLE_END
}
SET_VOL_BACK
SET_BACK_MIXER_POS
}
static void mix16bRampLoop(voice_t *v, uint32_t numSamples)
{
const int16_t *base, *smpPtr;
float fSample, *fMixBufferL, *fMixBufferR;
int32_t pos;
float fVolLDelta, fVolRDelta, fVolL, fVolR;
uint32_t i, samplesToMix, samplesLeft;
uint64_t posFrac;
GET_VOL_RAMP
GET_MIXER_VARS_RAMP
SET_BASE16
samplesLeft = numSamples;
while (samplesLeft > 0)
{
LIMIT_MIX_NUM
LIMIT_MIX_NUM_RAMP
samplesLeft -= samplesToMix;
for (i = 0; i < (samplesToMix & 3); i++)
{
RENDER_16BIT_SMP
VOLUME_RAMPING
INC_POS
}
samplesToMix >>= 2;
for (i = 0; i < samplesToMix; i++)
{
RENDER_16BIT_SMP
VOLUME_RAMPING
INC_POS
RENDER_16BIT_SMP
VOLUME_RAMPING
INC_POS
RENDER_16BIT_SMP
VOLUME_RAMPING
INC_POS
RENDER_16BIT_SMP
VOLUME_RAMPING
INC_POS
}
WRAP_LOOP
}
SET_VOL_BACK
SET_BACK_MIXER_POS
}
static void mix16bRampBidiLoop(voice_t *v, uint32_t numSamples)
{
const int16_t *base, *revBase, *smpPtr;
float fSample, *fMixBufferL, *fMixBufferR;
int32_t pos;
float fVolLDelta, fVolRDelta, fVolL, fVolR;
uint32_t i, samplesToMix, samplesLeft;
uint64_t posFrac, tmpDelta;
GET_VOL_RAMP
GET_MIXER_VARS_RAMP
SET_BASE16_BIDI
samplesLeft = numSamples;
while (samplesLeft > 0)
{
LIMIT_MIX_NUM
LIMIT_MIX_NUM_RAMP
samplesLeft -= samplesToMix;
START_BIDI
for (i = 0; i < (samplesToMix & 3); i++)
{
RENDER_16BIT_SMP
VOLUME_RAMPING
INC_POS_BIDI
}
samplesToMix >>= 2;
for (i = 0; i < samplesToMix; i++)
{
RENDER_16BIT_SMP
VOLUME_RAMPING
INC_POS_BIDI
RENDER_16BIT_SMP
VOLUME_RAMPING
INC_POS_BIDI
RENDER_16BIT_SMP
VOLUME_RAMPING
INC_POS_BIDI
RENDER_16BIT_SMP
VOLUME_RAMPING
INC_POS_BIDI
}
END_BIDI
WRAP_BIDI_LOOP
}
SET_VOL_BACK
SET_BACK_MIXER_POS
}
static void mix16bRampNoLoopIntrp(voice_t *v, uint32_t numSamples)
{
const int16_t *base, *smpPtr;
float fSample, fSample2, fSample3, fSample4, *fMixBufferL, *fMixBufferR;
int32_t pos;
float fVolLDelta, fVolRDelta, fVolL, fVolR;
uint32_t i, samplesToMix, samplesLeft;
uint64_t posFrac;
GET_VOL_RAMP
GET_MIXER_VARS_RAMP
SET_BASE16
samplesLeft = numSamples;
while (samplesLeft > 0)
{
LIMIT_MIX_NUM
LIMIT_MIX_NUM_RAMP
samplesLeft -= samplesToMix;
for (i = 0; i < (samplesToMix & 3); i++)
{
RENDER_16BIT_SMP_INTRP
VOLUME_RAMPING
INC_POS
}
samplesToMix >>= 2;
for (i = 0; i < samplesToMix; i++)
{
RENDER_16BIT_SMP_INTRP
VOLUME_RAMPING
INC_POS
RENDER_16BIT_SMP_INTRP
VOLUME_RAMPING
INC_POS
RENDER_16BIT_SMP_INTRP
VOLUME_RAMPING
INC_POS
RENDER_16BIT_SMP_INTRP
VOLUME_RAMPING
INC_POS
}
HANDLE_SAMPLE_END
}
SET_VOL_BACK
SET_BACK_MIXER_POS
}
static void mix16bRampLoopIntrp(voice_t *v, uint32_t numSamples)
{
const int16_t *base, *smpPtr;
float fSample, fSample2, fSample3, fSample4, *fMixBufferL, *fMixBufferR;
int32_t pos;
float fVolLDelta, fVolRDelta, fVolL, fVolR;
uint32_t i, samplesToMix, samplesLeft;
uint64_t posFrac;
GET_VOL_RAMP
GET_MIXER_VARS_RAMP
SET_BASE16
samplesLeft = numSamples;
while (samplesLeft > 0)
{
LIMIT_MIX_NUM
LIMIT_MIX_NUM_RAMP
samplesLeft -= samplesToMix;
for (i = 0; i < (samplesToMix & 3); i++)
{
RENDER_16BIT_SMP_INTRP
VOLUME_RAMPING
INC_POS
}
samplesToMix >>= 2;
for (i = 0; i < samplesToMix; i++)
{
RENDER_16BIT_SMP_INTRP
VOLUME_RAMPING
INC_POS
RENDER_16BIT_SMP_INTRP
VOLUME_RAMPING
INC_POS
RENDER_16BIT_SMP_INTRP
VOLUME_RAMPING
INC_POS
RENDER_16BIT_SMP_INTRP
VOLUME_RAMPING
INC_POS
}
WRAP_LOOP
}
SET_VOL_BACK
SET_BACK_MIXER_POS
}
static void mix16bRampBidiLoopIntrp(voice_t *v, uint32_t numSamples)
{
const int16_t *base, *revBase, *smpPtr;
float fSample, fSample2, fSample3, fSample4, *fMixBufferL, *fMixBufferR;
int32_t pos;
float fVolLDelta, fVolRDelta, fVolL, fVolR;
uint32_t i, samplesToMix, samplesLeft;
uint64_t posFrac, tmpDelta;
GET_VOL_RAMP
GET_MIXER_VARS_RAMP
SET_BASE16_BIDI
samplesLeft = numSamples;
while (samplesLeft > 0)
{
LIMIT_MIX_NUM
LIMIT_MIX_NUM_RAMP
samplesLeft -= samplesToMix;
START_BIDI
for (i = 0; i < (samplesToMix & 3); i++)
{
RENDER_16BIT_SMP_INTRP
VOLUME_RAMPING
INC_POS_BIDI
}
samplesToMix >>= 2;
for (i = 0; i < samplesToMix; i++)
{
RENDER_16BIT_SMP_INTRP
VOLUME_RAMPING
INC_POS_BIDI
RENDER_16BIT_SMP_INTRP
VOLUME_RAMPING
INC_POS_BIDI
RENDER_16BIT_SMP_INTRP
VOLUME_RAMPING
INC_POS_BIDI
RENDER_16BIT_SMP_INTRP
VOLUME_RAMPING
INC_POS_BIDI
}
END_BIDI
WRAP_BIDI_LOOP
}
SET_VOL_BACK
SET_BACK_MIXER_POS
}
// -----------------------------------------------------------------------
const mixFunc mixFuncTab[48] =
{
// normal mixing (this file)
(mixFunc)mix8bNoLoop,
(mixFunc)mix8bLoop,
(mixFunc)mix8bBidiLoop,
(mixFunc)mix8bNoLoopIntrp,
(mixFunc)mix8bLoopIntrp,
(mixFunc)mix8bBidiLoopIntrp,
(mixFunc)mix16bNoLoop,
(mixFunc)mix16bLoop,
(mixFunc)mix16bBidiLoop,
(mixFunc)mix16bNoLoopIntrp,
(mixFunc)mix16bLoopIntrp,
(mixFunc)mix16bBidiLoopIntrp,
(mixFunc)mix8bRampNoLoop,
(mixFunc)mix8bRampLoop,
(mixFunc)mix8bRampBidiLoop,
(mixFunc)mix8bRampNoLoopIntrp,
(mixFunc)mix8bRampLoopIntrp,
(mixFunc)mix8bRampBidiLoopIntrp,
(mixFunc)mix16bRampNoLoop,
(mixFunc)mix16bRampLoop,
(mixFunc)mix16bRampBidiLoop,
(mixFunc)mix16bRampNoLoopIntrp,
(mixFunc)mix16bRampLoopIntrp,
(mixFunc)mix16bRampBidiLoopIntrp,
// center mixing (ft2_center_mix.c)
(mixFunc)centerMix8bNoLoop,
(mixFunc)centerMix8bLoop,
(mixFunc)centerMix8bBidiLoop,
(mixFunc)centerMix8bNoLoopIntrp,
(mixFunc)centerMix8bLoopIntrp,
(mixFunc)centerMix8bBidiLoopIntrp,
(mixFunc)centerMix16bNoLoop,
(mixFunc)centerMix16bLoop,
(mixFunc)centerMix16bBidiLoop,
(mixFunc)centerMix16bNoLoopIntrp,
(mixFunc)centerMix16bLoopIntrp,
(mixFunc)centerMix16bBidiLoopIntrp,
(mixFunc)centerMix8bRampNoLoop,
(mixFunc)centerMix8bRampLoop,
(mixFunc)centerMix8bRampBidiLoop,
(mixFunc)centerMix8bRampNoLoopIntrp,
(mixFunc)centerMix8bRampLoopIntrp,
(mixFunc)centerMix8bRampBidiLoopIntrp,
(mixFunc)centerMix16bRampNoLoop,
(mixFunc)centerMix16bRampLoop,
(mixFunc)centerMix16bRampBidiLoop,
(mixFunc)centerMix16bRampNoLoopIntrp,
(mixFunc)centerMix16bRampLoopIntrp,
(mixFunc)centerMix16bRampBidiLoopIntrp
};