diff options
Diffstat (limited to 'plugins/gme/game-music-emu-0.6pre/gme/Opl_Apu.cpp')
| -rw-r--r-- | plugins/gme/game-music-emu-0.6pre/gme/Opl_Apu.cpp | 270 |
1 files changed, 270 insertions, 0 deletions
diff --git a/plugins/gme/game-music-emu-0.6pre/gme/Opl_Apu.cpp b/plugins/gme/game-music-emu-0.6pre/gme/Opl_Apu.cpp new file mode 100644 index 00000000..33f5bd46 --- /dev/null +++ b/plugins/gme/game-music-emu-0.6pre/gme/Opl_Apu.cpp @@ -0,0 +1,270 @@ +#include "Opl_Apu.h"
+
+#include "blargg_source.h"
+
+#include "ym2413.h"
+#include "fmopl.h"
+
+Opl_Apu::Opl_Apu() { opl = 0; opl_memory = 0; }
+
+blargg_err_t Opl_Apu::init( long clock, long rate, blip_time_t period, type_t type )
+{
+ type_ = type;
+ clock_ = clock;
+ rate_ = rate;
+ period_ = period;
+ set_output( 0, 0 );
+ volume( 1.0 );
+ switch (type)
+ {
+ case type_opll:
+ case type_msxmusic:
+ case type_smsfmunit:
+ opl = ym2413_init( clock, rate, 0 );
+ break;
+
+ case type_vrc7:
+ opl = ym2413_init( clock, rate, 1 );
+ break;
+
+ case type_opl:
+ opl = ym3526_init( clock, rate );
+ break;
+
+ case type_msxaudio:
+ //logfile = fopen("c:\\temp\\msxaudio.log", "wb");
+ opl = y8950_init( clock, rate );
+ opl_memory = malloc( 32768 );
+ y8950_set_delta_t_memory( opl, opl_memory, 32768 );
+ break;
+
+ case type_opl2:
+ opl = ym3812_init( clock, rate );
+ break;
+ }
+ reset();
+ return 0;
+}
+
+Opl_Apu::~Opl_Apu()
+{
+ if (opl)
+ {
+ switch (type_)
+ {
+ case type_opll:
+ case type_msxmusic:
+ case type_smsfmunit:
+ case type_vrc7:
+ ym2413_shutdown( opl );
+ break;
+
+ case type_opl:
+ ym3526_shutdown( opl );
+ break;
+
+ case type_msxaudio:
+ y8950_shutdown( opl );
+ free( opl_memory );
+ //fclose( logfile );
+ break;
+
+ case type_opl2:
+ ym3812_shutdown( opl );
+ break;
+ }
+ }
+}
+
+void Opl_Apu::reset()
+{
+ addr = 0;
+ next_time = 0;
+ last_amp = 0;
+
+ switch (type_)
+ {
+ case type_opll:
+ case type_msxmusic:
+ case type_smsfmunit:
+ case type_vrc7:
+ ym2413_reset_chip( opl );
+ break;
+
+ case type_opl:
+ ym3526_reset_chip( opl );
+ break;
+
+ case type_msxaudio:
+ y8950_reset_chip( opl );
+ break;
+
+ case type_opl2:
+ ym3812_reset_chip( opl );
+ break;
+ }
+}
+
+void Opl_Apu::write_data( blip_time_t time, int data )
+{
+ run_until( time );
+ switch (type_)
+ {
+ case type_opll:
+ case type_msxmusic:
+ case type_smsfmunit:
+ case type_vrc7:
+ ym2413_write( opl, 0, addr );
+ ym2413_write( opl, 1, data );
+ break;
+
+ case type_opl:
+ ym3526_write( opl, 0, addr );
+ ym3526_write( opl, 1, data );
+ break;
+
+ case type_msxaudio:
+ /*if ( addr >= 7 && addr <= 7 + 11 )
+ {
+ unsigned char temp [2] = { addr - 7, data };
+ fwrite( &temp, 1, 2, logfile );
+ }*/
+ y8950_write( opl, 0, addr );
+ y8950_write( opl, 1, data );
+ break;
+
+ case type_opl2:
+ ym3812_write( opl, 0, addr );
+ ym3812_write( opl, 1, data );
+ break;
+ }
+}
+
+int Opl_Apu::read( blip_time_t time, int port )
+{
+ run_until( time );
+ switch (type_)
+ {
+ case type_opll:
+ case type_msxmusic:
+ case type_smsfmunit:
+ case type_vrc7:
+ return ym2413_read( opl, port );
+
+ case type_opl:
+ return ym3526_read( opl, port );
+
+ case type_msxaudio:
+ {
+ int ret = y8950_read( opl, port );
+ /*unsigned char temp [2] = { port + 0x80, ret };
+ fwrite( &temp, 1, 2, logfile );*/
+ return ret;
+ }
+
+ case type_opl2:
+ return ym3812_read( opl, port );
+ }
+
+ return 0;
+}
+
+void Opl_Apu::end_frame( blip_time_t time )
+{
+ run_until( time );
+ next_time -= time;
+
+ if ( output_ )
+ output_->set_modified();
+}
+
+void Opl_Apu::run_until( blip_time_t end_time )
+{
+ if ( end_time > next_time )
+ {
+ blip_time_t time_delta = end_time - next_time;
+ blip_time_t time = next_time;
+ unsigned count = time_delta / period_ + 1;
+ switch (type_)
+ {
+ case type_opll:
+ case type_msxmusic:
+ case type_smsfmunit:
+ case type_vrc7:
+ {
+ SAMP bufMO[ 1024 ];
+ SAMP bufRO[ 1024 ];
+ SAMP * buffers[2] = { bufMO, bufRO };
+
+ while ( count > 0 )
+ {
+ unsigned todo = count;
+ if ( todo > 1024 ) todo = 1024;
+ ym2413_update_one( opl, buffers, todo );
+
+ if ( output_ )
+ {
+ int last_amp = this->last_amp;
+ for ( unsigned i = 0; i < todo; i++ )
+ {
+ int amp = bufMO [i] + bufRO [i];
+ int delta = amp - last_amp;
+ if ( delta )
+ {
+ last_amp = amp;
+ synth.offset_inline( time, delta, output_ );
+ }
+ time += period_;
+ }
+ this->last_amp = last_amp;
+ }
+ else time += period_ * todo;
+
+ count -= todo;
+ }
+ }
+ break;
+
+ case type_opl:
+ case type_msxaudio:
+ case type_opl2:
+ {
+ OPLSAMPLE buffer[ 1024 ];
+
+ while ( count > 0 )
+ {
+ unsigned todo = count;
+ if ( todo > 1024 ) todo = 1024;
+ switch (type_)
+ {
+ case type_opl: ym3526_update_one( opl, buffer, todo ); break;
+ case type_msxaudio: y8950_update_one( opl, buffer, todo ); break;
+ case type_opl2: ym3812_update_one( opl, buffer, todo ); break;
+ }
+
+ if ( output_ )
+ {
+ int last_amp = this->last_amp;
+ for ( unsigned i = 0; i < todo; i++ )
+ {
+ int amp = buffer [i];
+ int delta = amp - last_amp;
+ if ( delta )
+ {
+ last_amp = amp;
+ synth.offset_inline( time, delta, output_ );
+ }
+ time += period_;
+ }
+ this->last_amp = last_amp;
+ }
+ else time += period_ * todo;
+
+ count -= todo;
+ }
+ }
+ break;
+ }
+ next_time = time;
+ }
+}
\ No newline at end of file |