mirror of
https://git.do.srb2.org/KartKrew/Kart-Public.git
synced 2024-12-28 05:11:34 +00:00
77 lines
1.6 KiB
C++
77 lines
1.6 KiB
C++
// Atari POKEY sound chip emulator
|
|
|
|
// Game_Music_Emu 0.6.0
|
|
#ifndef SAP_APU_H
|
|
#define SAP_APU_H
|
|
|
|
#include "blargg_common.h"
|
|
#include "Blip_Buffer.h"
|
|
|
|
class Sap_Apu_Impl;
|
|
|
|
class Sap_Apu {
|
|
public:
|
|
enum { osc_count = 4 };
|
|
void osc_output( int index, Blip_Buffer* );
|
|
|
|
void reset( Sap_Apu_Impl* );
|
|
|
|
enum { start_addr = 0xD200 };
|
|
enum { end_addr = 0xD209 };
|
|
void write_data( blip_time_t, unsigned addr, int data );
|
|
|
|
void end_frame( blip_time_t );
|
|
|
|
public:
|
|
Sap_Apu();
|
|
private:
|
|
struct osc_t
|
|
{
|
|
unsigned char regs [2];
|
|
unsigned char phase;
|
|
unsigned char invert;
|
|
int last_amp;
|
|
blip_time_t delay;
|
|
blip_time_t period; // always recalculated before use; here for convenience
|
|
Blip_Buffer* output;
|
|
};
|
|
osc_t oscs [osc_count];
|
|
Sap_Apu_Impl* impl;
|
|
blip_time_t last_time;
|
|
int poly5_pos;
|
|
int poly4_pos;
|
|
int polym_pos;
|
|
int control;
|
|
|
|
void calc_periods();
|
|
void run_until( blip_time_t );
|
|
|
|
enum { poly4_len = (1L << 4) - 1 };
|
|
enum { poly9_len = (1L << 9) - 1 };
|
|
enum { poly17_len = (1L << 17) - 1 };
|
|
friend class Sap_Apu_Impl;
|
|
};
|
|
|
|
// Common tables and Blip_Synth that can be shared among multiple Sap_Apu objects
|
|
class Sap_Apu_Impl {
|
|
public:
|
|
Blip_Synth<blip_good_quality,1> synth;
|
|
|
|
Sap_Apu_Impl();
|
|
void volume( double d ) { synth.volume( 1.0 / Sap_Apu::osc_count / 30 * d ); }
|
|
|
|
private:
|
|
typedef unsigned char byte;
|
|
byte poly4 [Sap_Apu::poly4_len / 8 + 1];
|
|
byte poly9 [Sap_Apu::poly9_len / 8 + 1];
|
|
byte poly17 [Sap_Apu::poly17_len / 8 + 1];
|
|
friend class Sap_Apu;
|
|
};
|
|
|
|
inline void Sap_Apu::osc_output( int i, Blip_Buffer* b )
|
|
{
|
|
assert( (unsigned) i < osc_count );
|
|
oscs [i].output = b;
|
|
}
|
|
|
|
#endif
|