raze-gles/libraries/game-music-emu/gme/Effects_Buffer.h

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// Multi-channel effects buffer with panning, echo and reverb
// Game_Music_Emu https://bitbucket.org/mpyne/game-music-emu/
#ifndef EFFECTS_BUFFER_H
#define EFFECTS_BUFFER_H
#include "Multi_Buffer.h"
#include <vector>
// Effects_Buffer uses several buffers and outputs stereo sample pairs.
class Effects_Buffer : public Multi_Buffer {
public:
// nVoices indicates the number of voices for which buffers will be allocated
// to make Effects_Buffer work as "mix everything to one", nVoices will be 1
// If center_only is true, only center buffers are created and
// less memory is used.
Effects_Buffer( int nVoices = 1, bool center_only = false );
// Channel Effect Center Pan
// ---------------------------------
// 0,5 reverb pan_1
// 1,6 reverb pan_2
// 2,7 echo -
// 3 echo -
// 4 echo -
// Channel configuration
struct config_t {
double pan_1; // -1.0 = left, 0.0 = center, 1.0 = right
double pan_2;
double echo_delay; // msec
double echo_level; // 0.0 to 1.0
double reverb_delay; // msec
double delay_variance; // difference between left/right delays (msec)
double reverb_level; // 0.0 to 1.0
bool effects_enabled; // if false, use optimized simple mixer
config_t();
};
// Set configuration of buffer
virtual void config( const config_t& );
void set_depth( double );
public:
~Effects_Buffer();
blargg_err_t set_sample_rate( long samples_per_sec, int msec = blip_default_length );
void clock_rate( long );
void bass_freq( int );
void clear();
channel_t channel( int, int );
void end_frame( blip_time_t );
long read_samples( blip_sample_t*, long );
long samples_avail() const;
private:
typedef long fixed_t;
int max_voices;
enum { max_buf_count = 7 };
std::vector<Blip_Buffer> bufs;
enum { chan_types_count = 3 };
std::vector<channel_t> chan_types;
config_t config_;
long stereo_remain;
long effect_remain;
int buf_count;
bool effects_enabled;
std::vector<std::vector<blip_sample_t> > reverb_buf;
std::vector<std::vector<blip_sample_t> > echo_buf;
std::vector<int> reverb_pos;
std::vector<int> echo_pos;
struct {
fixed_t pan_1_levels [2];
fixed_t pan_2_levels [2];
int echo_delay_l;
int echo_delay_r;
fixed_t echo_level;
int reverb_delay_l;
int reverb_delay_r;
fixed_t reverb_level;
} chans;
void mix_mono( blip_sample_t*, blargg_long );
void mix_stereo( blip_sample_t*, blargg_long );
void mix_enhanced( blip_sample_t*, blargg_long );
void mix_mono_enhanced( blip_sample_t*, blargg_long );
};
#endif