76 lines
2.0 KiB
C
76 lines
2.0 KiB
C
|
// Sega Master System SN76489 PSG sound chip emulator
|
||
|
|
|
||
|
|
// Sms_Snd_Emu 0.1.4
|
||
|
|
#ifndef SMS_APU_H
|
||
|
|
#define SMS_APU_H
|
||
|
|
|
||
|
|
#include "Sms_Oscs.h"
|
||
|
|
|
||
|
|
class Sms_Apu {
|
||
|
|
public:
|
||
|
|
// Set overall volume of all oscillators, where 1.0 is full volume
|
||
|
|
void volume( double );
|
||
|
|
|
||
|
|
// Set treble equalization
|
||
|
|
void treble_eq( const blip_eq_t& );
|
||
|
|
|
||
|
|
// Outputs can be assigned to a single buffer for mono output, or to three
|
||
|
|
// buffers for stereo output (using Stereo_Buffer to do the mixing).
|
||
|
|
|
||
|
|
// Assign all oscillator outputs to specified buffer(s). If buffer
|
||
|
|
// is NULL, silences all oscillators.
|
||
|
|
void output( Blip_Buffer* mono );
|
||
|
|
void output( Blip_Buffer* center, Blip_Buffer* left, Blip_Buffer* right );
|
||
|
|
|
||
|
|
// Assign single oscillator output to buffer(s). Valid indicies are 0 to 3,
|
||
|
|
// which refer to Square 1, Square 2, Square 3, and Noise. If buffer is NULL,
|
||
|
|
// silences oscillator.
|
||
|
|
enum { osc_count = 4 };
|
||
|
|
void osc_output( int index, Blip_Buffer* mono );
|
||
|
|
void osc_output( int index, Blip_Buffer* center, Blip_Buffer* left, Blip_Buffer* right );
|
||
|
|
|
||
|
|
// Reset oscillators and internal state
|
||
|
|
void reset( unsigned noise_feedback = 0, int noise_width = 0 );
|
||
|
|
|
||
|
|
// Write GameGear left/right assignment byte
|
||
|
|
void write_ggstereo( blip_time_t, int );
|
||
|
|
|
||
|
|
// Write to data port
|
||
|
|
void write_data( blip_time_t, int );
|
||
|
|
|
||
|
|
// Run all oscillators up to specified time, end current frame, then
|
||
|
|
// start a new frame at time 0.
|
||
|
|
void end_frame( blip_time_t );
|
||
|
|
|
||
|
|
public:
|
||
|
|
Sms_Apu();
|
||
|
|
~Sms_Apu();
|
||
|
|
private:
|
||
|
|
// noncopyable
|
||
|
|
Sms_Apu( const Sms_Apu& );
|
||
|
|
Sms_Apu& operator = ( const Sms_Apu& );
|
||
|
|
|
||
|
|
Sms_Osc* oscs [osc_count];
|
||
|
|
Sms_Square squares [3];
|
||
|
|
Sms_Square::Synth square_synth; // used by squares
|
||
|
|
blip_time_t last_time;
|
||
|
|
int latch;
|
||
|
|
Sms_Noise noise;
|
||
|
|
unsigned noise_feedback;
|
||
|
|
unsigned looped_feedback;
|
||
|
|
|
||
|
|
void run_until( blip_time_t );
|
||
|
|
};
|
||
|
|
|
||
|
|
struct sms_apu_state_t
|
||
|
|
{
|
||
|
|
unsigned char regs [8] [2];
|
||
|
|
unsigned char latch;
|
||
|
|
};
|
||
|
|
|
||
|
|
inline void Sms_Apu::output( Blip_Buffer* b ) { output( b, b, b ); }
|
||
|
|
|
||
|
|
inline void Sms_Apu::osc_output( int i, Blip_Buffer* b ) { osc_output( i, b, b, b ); }
|
||
|
|
|
||
|
|
#endif
|