cog/Frameworks/GME/gme/Ym2151_Emu.cpp

76 lines
1.5 KiB
C++

// Game_Music_Emu $vers. http://www.slack.net/~ant/
#include "Ym2151_Emu.h"
#include "ym2151.h"
Ym2151_Emu::Ym2151_Emu() { PSG = 0; }
Ym2151_Emu::~Ym2151_Emu()
{
if ( PSG ) ym2151_shutdown( PSG );
}
int Ym2151_Emu::set_rate( double sample_rate, double clock_rate )
{
if ( PSG )
{
ym2151_shutdown( PSG );
PSG = 0;
}
PSG = ym2151_init( clock_rate, sample_rate );
if ( !PSG )
return 1;
reset();
return 0;
}
void Ym2151_Emu::reset()
{
ym2151_reset_chip( PSG );
ym2151_set_mask( PSG, 0 );
}
static stream_sample_t* DUMMYBUF[0x02] = {(stream_sample_t*)NULL, (stream_sample_t*)NULL};
void Ym2151_Emu::write( int addr, int data )
{
ym2151_update_one( PSG, DUMMYBUF, 0 );
ym2151_write_reg( PSG, addr, data );
}
void Ym2151_Emu::mute_voices( int mask )
{
ym2151_set_mask( PSG, mask );
}
void Ym2151_Emu::run( int pair_count, sample_t* out )
{
SAMP bufL[ 1024 ];
SAMP bufR[ 1024 ];
SAMP * buffers[2] = { bufL, bufR };
while (pair_count > 0)
{
int todo = pair_count;
if (todo > 1024) todo = 1024;
ym2151_update_one( PSG, buffers, todo );
for (int i = 0; i < todo; i++)
{
int output_l = bufL [i];
int output_r = bufR [i];
output_l += out [0];
output_r += out [1];
if ( (short)output_l != output_l ) output_l = 0x7FFF ^ ( output_l >> 31 );
if ( (short)output_r != output_r ) output_r = 0x7FFF ^ ( output_r >> 31 );
out [0] = output_l;
out [1] = output_r;
out += 2;
}
pair_count -= todo;
}
}