int MDFNGBSOUND_StateAction(StateMem *sm, int load, int data_only)
{
gb_apu_state_t gb_state;
int ret = 1;
//if(!load) // always save state, in case there is none to load
{
gb_apu.save_state(&gb_state);
}
SFORMAT StateRegs[] =
{
SFVARN(gb_state, "apu_state"),
SFEND
};
if(!MDFNSS_StateAction(sm, load, data_only, StateRegs, "APU"))
ret = 0;
else if(load)
{
// TODO: set hardware mode to mode_dmg, mode_cgb, or mode_agb
// (latter if you're running classic GB game on Game Boy Advance)
gb_apu.reset();
gb_apu.load_state(gb_state);
}
return(ret);
}
uint8_t read_apu(uint16_t addr) {
#if !defined(PSP) && !defined(EMSCRIPTEN)
return apu.read_register(cycles, addr);
#else
return 0x0;
#endif
}
void init_apu() {
#if !defined(PSP) && !defined(EMSCRIPTEN)
if ( SDL_Init( SDL_INIT_AUDIO ) < 0 )
{
atexit( SDL_Quit );
}
stereo_buf.clock_rate(CLOCK_RATE);
stereo_buf.set_sample_rate(SAMPLE_RATE);
apu.treble_eq(-15.0);
stereo_buf.bass_freq(100);
apu.set_output( stereo_buf.center(), stereo_buf.left(), stereo_buf.right() );
sound.start(SAMPLE_RATE, 2);
#endif
}
uint32 MDFNGBSOUND_Read(int ts, uint32 addr)
{
uint32 ret;
ret = gb_apu.read_register(ts*GB_APU_OVERCLOCK, addr);
return(ret);
}
void end_frame() {
#if !defined(PSP) && !defined(EMSCRIPTEN)
apu.end_frame(MAX_CYCLES);
stereo_buf.end_frame(MAX_CYCLES);
if (stereo_buf.samples_avail() >= BUF_SIZE) {
size_t count = stereo_buf.read_samples(sample_buffer, BUF_SIZE );
sound.write(sample_buffer, count );
}
#endif
}
static bool RedoBuffer(uint32 rate)
{
if(gb_buf)
{
delete gb_buf;
gb_buf = NULL;
}
gb_apu.set_output(NULL, NULL, NULL);
if(rate)
{
gb_buf = new Stereo_Buffer();
gb_buf->set_sample_rate(rate, 40);
gb_buf->clock_rate((long)(4194304 * GB_APU_OVERCLOCK * 1));
gb_apu.set_output(gb_buf->center(), gb_buf->left(), gb_buf->right());
}
return(TRUE);
}
int32 MDFNGBSOUND_Flush(int ts, int16 *SoundBuf, const int32 MaxSoundFrames)
{
int32 SoundFrames = 0;
gb_apu.end_frame(ts * GB_APU_OVERCLOCK);
if(SoundBuf && gb_buf)
{
gb_buf->end_frame(ts * GB_APU_OVERCLOCK);
SoundFrames = gb_buf->read_samples(SoundBuf, MaxSoundFrames * 2) / 2;
}
else if(gb_buf)
exit(1);
return(SoundFrames);
}
void write_apu(uint16_t addr, uint8_t val) {
#if !defined(PSP) && !defined(EMSCRIPTEN)
apu.write_register(cycles, addr, val);
#endif
}
void MDFNGBSOUND_Write(int ts, uint32 addr, uint8 val)
{
//if(addr == 0xFF26)
// printf("%04x %02x\n", addr, val);
gb_apu.write_register(ts * GB_APU_OVERCLOCK, addr, val);
}
void MDFNGBSOUND_Reset(void)
{
// TODO: set hardware mode to mode_dmg, mode_cgb, or mode_agb
// (latter if you're running classic GB game on Game Boy Advance)
gb_apu.reset();
}
void MDFNGBSOUND_Init(void)
{
gb_apu.volume(0.5);
RedoBuffer(0);
}
