108 lines
2.3 KiB
C
108 lines
2.3 KiB
C
|
// AY-3-8910 sound chip emulator
|
||
|
|
|
||
|
|
// Game_Music_Emu 0.5.2
|
||
|
|
#ifndef AY_APU_H
|
||
|
|
#define AY_APU_H
|
||
|
|
|
||
|
|
#include "blargg_common.h"
|
||
|
|
#include "Blip_Buffer.h"
|
||
|
|
|
||
|
|
class Ay_Apu {
|
||
|
|
public:
|
||
|
|
// Set buffer to generate all sound into, or disable sound if NULL
|
||
|
|
void output( Blip_Buffer* );
|
||
|
|
|
||
|
|
// Reset sound chip
|
||
|
|
void reset();
|
||
|
|
|
||
|
|
// Write to register at specified time
|
||
|
|
enum { reg_count = 16 };
|
||
|
|
void write( blip_time_t time, int addr, int data );
|
||
|
|
|
||
|
|
// Run sound to specified time, end current time frame, then start a new
|
||
|
|
// time frame at time 0. Time frames have no effect on emulation and each
|
||
|
|
// can be whatever length is convenient.
|
||
|
|
void end_frame( blip_time_t length );
|
||
|
|
|
||
|
|
// Additional features
|
||
|
|
|
||
|
|
// Set sound output of specific oscillator to buffer, where index is
|
||
|
|
// 0, 1, or 2. If buffer is NULL, the specified oscillator is muted.
|
||
|
|
enum { osc_count = 3 };
|
||
|
|
void osc_output( int index, Blip_Buffer* );
|
||
|
|
|
||
|
|
// Set overall volume (default is 1.0)
|
||
|
|
void volume( double );
|
||
|
|
|
||
|
|
// Set treble equalization (see documentation)
|
||
|
|
void treble_eq( blip_eq_t const& );
|
||
|
|
|
||
|
|
public:
|
||
|
|
Ay_Apu();
|
||
|
|
typedef unsigned char byte;
|
||
|
|
private:
|
||
|
|
struct osc_t
|
||
|
|
{
|
||
|
|
blip_time_t period;
|
||
|
|
blip_time_t delay;
|
||
|
|
short last_amp;
|
||
|
|
short phase;
|
||
|
|
Blip_Buffer* output;
|
||
|
|
} oscs [osc_count];
|
||
|
|
blip_time_t last_time;
|
||
|
|
byte latch;
|
||
|
|
byte regs [reg_count];
|
||
|
|
|
||
|
|
struct {
|
||
|
|
blip_time_t delay;
|
||
|
|
blargg_ulong lfsr;
|
||
|
|
} noise;
|
||
|
|
|
||
|
|
struct {
|
||
|
|
blip_time_t delay;
|
||
|
|
byte const* wave;
|
||
|
|
int pos;
|
||
|
|
byte modes [8] [48]; // values already passed through volume table
|
||
|
|
} env;
|
||
|
|
|
||
|
|
void run_until( blip_time_t );
|
||
|
|
void write_data_( int addr, int data );
|
||
|
|
public:
|
||
|
|
enum { amp_range = 255 };
|
||
|
|
Blip_Synth<blip_good_quality,1> synth_;
|
||
|
|
};
|
||
|
|
|
||
|
|
inline void Ay_Apu::volume( double v ) { synth_.volume( 0.7 / osc_count / amp_range * v ); }
|
||
|
|
|
||
|
|
inline void Ay_Apu::treble_eq( blip_eq_t const& eq ) { synth_.treble_eq( eq ); }
|
||
|
|
|
||
|
|
inline void Ay_Apu::write( blip_time_t time, int addr, int data )
|
||
|
|
{
|
||
|
|
run_until( time );
|
||
|
|
write_data_( addr, data );
|
||
|
|
}
|
||
|
|
|
||
|
|
inline void Ay_Apu::osc_output( int i, Blip_Buffer* buf )
|
||
|
|
{
|
||
|
|
assert( (unsigned) i < osc_count );
|
||
|
|
oscs [i].output = buf;
|
||
|
|
}
|
||
|
|
|
||
|
|
inline void Ay_Apu::output( Blip_Buffer* buf )
|
||
|
|
{
|
||
|
|
osc_output( 0, buf );
|
||
|
|
osc_output( 1, buf );
|
||
|
|
osc_output( 2, buf );
|
||
|
|
}
|
||
|
|
|
||
|
|
inline void Ay_Apu::end_frame( blip_time_t time )
|
||
|
|
{
|
||
|
|
if ( time > last_time )
|
||
|
|
run_until( time );
|
||
|
|
|
||
|
|
assert( last_time >= time );
|
||
|
|
last_time -= time;
|
||
|
|
}
|
||
|
|
|
||
|
|
#endif
|