mirror of
https://github.com/ZDoom/gzdoom.git
synced 2024-11-14 16:40:56 +00:00
131 lines
2.7 KiB
C++
131 lines
2.7 KiB
C++
// Sunsoft FME-7 sound emulator
|
|
|
|
// Game_Music_Emu https://bitbucket.org/mpyne/game-music-emu/
|
|
#ifndef NES_FME7_APU_H
|
|
#define NES_FME7_APU_H
|
|
|
|
#include "blargg_common.h"
|
|
#include "Blip_Buffer.h"
|
|
|
|
struct fme7_apu_state_t
|
|
{
|
|
enum { reg_count = 14 };
|
|
uint8_t regs [reg_count];
|
|
uint8_t phases [3]; // 0 or 1
|
|
uint8_t latch;
|
|
uint16_t delays [3]; // a, b, c
|
|
};
|
|
|
|
class Nes_Fme7_Apu : private fme7_apu_state_t {
|
|
public:
|
|
// See Nes_Apu.h for reference
|
|
void reset();
|
|
void volume( double );
|
|
void treble_eq( blip_eq_t const& );
|
|
void output( Blip_Buffer* );
|
|
enum { osc_count = 3 };
|
|
void osc_output( int index, Blip_Buffer* );
|
|
void end_frame( blip_time_t );
|
|
void save_state( fme7_apu_state_t* ) const;
|
|
void load_state( fme7_apu_state_t const& );
|
|
|
|
// Mask and addresses of registers
|
|
enum { addr_mask = 0xE000 };
|
|
enum { data_addr = 0xE000 };
|
|
enum { latch_addr = 0xC000 };
|
|
|
|
// (addr & addr_mask) == latch_addr
|
|
void write_latch( int );
|
|
|
|
// (addr & addr_mask) == data_addr
|
|
void write_data( blip_time_t, int data );
|
|
|
|
public:
|
|
Nes_Fme7_Apu();
|
|
BLARGG_DISABLE_NOTHROW
|
|
private:
|
|
// noncopyable
|
|
Nes_Fme7_Apu( const Nes_Fme7_Apu& );
|
|
Nes_Fme7_Apu& operator = ( const Nes_Fme7_Apu& );
|
|
|
|
static unsigned char const amp_table [16];
|
|
|
|
struct {
|
|
Blip_Buffer* output;
|
|
int last_amp;
|
|
} oscs [osc_count];
|
|
blip_time_t last_time;
|
|
|
|
enum { amp_range = 192 }; // can be any value; this gives best error/quality tradeoff
|
|
Blip_Synth<blip_good_quality,1> synth;
|
|
|
|
void run_until( blip_time_t );
|
|
};
|
|
|
|
inline void Nes_Fme7_Apu::volume( double v )
|
|
{
|
|
synth.volume( 0.38 / amp_range * v ); // to do: fine-tune
|
|
}
|
|
|
|
inline void Nes_Fme7_Apu::treble_eq( blip_eq_t const& eq )
|
|
{
|
|
synth.treble_eq( eq );
|
|
}
|
|
|
|
inline void Nes_Fme7_Apu::osc_output( int i, Blip_Buffer* buf )
|
|
{
|
|
assert( (unsigned) i < osc_count );
|
|
oscs [i].output = buf;
|
|
}
|
|
|
|
inline void Nes_Fme7_Apu::output( Blip_Buffer* buf )
|
|
{
|
|
for ( int i = 0; i < osc_count; i++ )
|
|
osc_output( i, buf );
|
|
}
|
|
|
|
inline Nes_Fme7_Apu::Nes_Fme7_Apu()
|
|
{
|
|
output( NULL );
|
|
volume( 1.0 );
|
|
reset();
|
|
}
|
|
|
|
inline void Nes_Fme7_Apu::write_latch( int data ) { latch = data; }
|
|
|
|
inline void Nes_Fme7_Apu::write_data( blip_time_t time, int data )
|
|
{
|
|
if ( (unsigned) latch >= reg_count )
|
|
{
|
|
#ifdef debug_printf
|
|
debug_printf( "FME7 write to %02X (past end of sound registers)\n", (int) latch );
|
|
#endif
|
|
return;
|
|
}
|
|
|
|
run_until( time );
|
|
regs [latch] = data;
|
|
}
|
|
|
|
inline void Nes_Fme7_Apu::end_frame( blip_time_t time )
|
|
{
|
|
if ( time > last_time )
|
|
run_until( time );
|
|
|
|
assert( last_time >= time );
|
|
last_time -= time;
|
|
}
|
|
|
|
inline void Nes_Fme7_Apu::save_state( fme7_apu_state_t* out ) const
|
|
{
|
|
*out = *this;
|
|
}
|
|
|
|
inline void Nes_Fme7_Apu::load_state( fme7_apu_state_t const& in )
|
|
{
|
|
reset();
|
|
fme7_apu_state_t* state = this;
|
|
*state = in;
|
|
}
|
|
|
|
#endif
|