vg_audio_dsp.h

   1 #pragma once
   2
   3 //#define VG_ECHO_LPF_BUTTERWORTH
   4
   5 #include "vg_platform.h"
   6 #include "dep/glad/glad.h"
   7 #include "vg_m.h"
   8
   9 struct vg_dsp
  10 {
  11    float     *buffer;
  12    u32        allocations;
  13
  14    u8        *view_texture_buffer;
  15    GLuint     view_texture;
  16
  17    float      echo_distances[14],
  18               echo_tunings[8],
  19               reverb_wet_mix,
  20               reverb_dry_mix;
  21
  22    vg_rand    rand;
  23 }
  24 extern vg_dsp;
  25
  26 struct dsp_delay
  27 {
  28    u32 length, cur;
  29    float *buffer;
  30 };
  31
  32 struct dsp_lpf
  33 {
  34    float exponent;
  35    float *buffer;
  36 };
  37
  38 struct dsp_schroeder
  39 {
  40    struct dsp_delay M;
  41    float gain;
  42 };
  43
  44 struct dsp_biquad
  45 {
  46    f32 a0, a1, a2, b1, b2, c0, d0,
  47        xnz1, xnz2, ynz1, ynz2, offset;
  48 };
  49
  50 void vg_dsp_init( void );
  51 void vg_dsp_free( void );
  52 void dsp_update_tunings(void);
  53 void vg_dsp_process( float *stereo_in, float *stereo_out );
  54 void vg_dsp_update_texture( void );
  55
  56 f32 dsp_biquad_process( struct dsp_biquad *bq, f32 xn );
  57 void dsp_init_biquad_butterworth_lpf( struct dsp_biquad *bq, f32 fc );
  58 void dsp_read_delay( struct dsp_delay *delay, float *s, u32 t );
  59 void dsp_write_delay( struct dsp_delay *delay, float *s );
  60 void dsp_init_delay( struct dsp_delay *delay, float length );
  61 void dsp_update_lpf( struct dsp_lpf *lpf, float freq );
  62 void dsp_init_lpf( struct dsp_lpf *lpf, float freq );
  63 void dsp_write_lpf( struct dsp_lpf *lpf, float *s );
  64 void dsp_read_lpf( struct dsp_lpf *lpf, float *s );
  65 void dsp_init_schroeder( struct dsp_schroeder *sch, float length, float gain );
  66 void dsp_process_schroeder( struct dsp_schroeder *sch,
  67                             float *input, float *output );