diff options
Diffstat (limited to 'OpenAL32/Include/alu.h')
| -rw-r--r-- | OpenAL32/Include/alu.h | 34 |
1 files changed, 30 insertions, 4 deletions
diff --git a/OpenAL32/Include/alu.h b/OpenAL32/Include/alu.h index 27cf6713..0832fbfb 100644 --- a/OpenAL32/Include/alu.h +++ b/OpenAL32/Include/alu.h @@ -22,10 +22,10 @@ #define MAX_PITCH (255) /* Maximum number of buffer samples before the current pos needed for resampling. */ -#define MAX_PRE_SAMPLES 4 +#define MAX_PRE_SAMPLES 12 /* Maximum number of buffer samples after the current pos needed for resampling. */ -#define MAX_POST_SAMPLES 4 +#define MAX_POST_SAMPLES 12 #ifdef __cplusplus @@ -36,6 +36,29 @@ struct ALsource; struct ALvoice; +/* The number of distinct scale and phase intervals within the filter table. */ +#define BSINC_SCALE_BITS 4 +#define BSINC_SCALE_COUNT (1<<BSINC_SCALE_BITS) +#define BSINC_PHASE_BITS 4 +#define BSINC_PHASE_COUNT (1<<BSINC_PHASE_BITS) + +/* Interpolator state. Kind of a misnomer since the interpolator itself is + * stateless. This just keeps it from having to recompute scale-related + * mappings for every sample. + */ +typedef struct BsincState { + ALfloat sf; /* Scale interpolation factor. */ + ALuint m; /* Coefficient count. */ + ALint l; /* Left coefficient offset. */ + struct { + const ALfloat *filter; /* Filter coefficients. */ + const ALfloat *scDelta; /* Scale deltas. */ + const ALfloat *phDelta; /* Phase deltas. */ + const ALfloat *spDelta; /* Scale-phase deltas. */ + } coeffs[BSINC_PHASE_COUNT]; +} BsincState; + + typedef union aluVector { alignas(16) ALfloat v[4]; } aluVector; @@ -132,8 +155,9 @@ typedef struct SendParams { } SendParams; -typedef const ALfloat* (*ResamplerFunc)(const ALfloat *src, ALuint frac, ALuint increment, - ALfloat *restrict dst, ALuint dstlen); +typedef const ALfloat* (*ResamplerFunc)(const BsincState *state, + const ALfloat *src, ALuint frac, ALuint increment, ALfloat *restrict dst, ALuint dstlen +); typedef void (*MixerFunc)(const ALfloat *data, ALuint OutChans, ALfloat (*restrict OutBuffer)[BUFFERSIZE], struct MixGains *Gains, @@ -203,6 +227,8 @@ union ResamplerCoeffs { }; extern alignas(16) union ResamplerCoeffs ResampleCoeffs; +extern alignas(16) const ALfloat bsincTab[18840]; + inline ALfloat lerp(ALfloat val1, ALfloat val2, ALfloat mu) { |