13cbade08a
git-svn-id: svn://svn.rockbox.org/rockbox/trunk@30397 a1c6a512-1295-4272-9138-f99709370657
66 lines
1.6 KiB
C
66 lines
1.6 KiB
C
// Turbo Grafx 16 (PC Engine) PSG sound chip emulator
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// Game_Music_Emu 0.5.2
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#ifndef HES_APU_H
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#define HES_APU_H
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#include "blargg_common.h"
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#include "blargg_source.h"
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#include "blip_buffer.h"
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enum { amp_range = 0x8000 };
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enum { osc_count = 6 }; // 0 <= chan < osc_count
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// Registers are at io_addr to io_addr+io_size-1
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enum { apu_io_addr = 0x0800 };
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enum { apu_io_size = 10 };
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struct Hes_Osc
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{
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byte wave [32];
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int delay;
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int period;
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int phase;
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int noise_delay;
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byte noise;
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unsigned lfsr;
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byte control;
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byte balance;
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byte dac;
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short volume [2];
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int last_amp [2];
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blip_time_t last_time;
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struct Blip_Buffer* output [2];
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struct Blip_Buffer* outputs [3];
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};
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void Osc_run_until( struct Hes_Osc* this, struct Blip_Synth* synth, blip_time_t );
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struct Hes_Apu {
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int latch;
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int balance;
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struct Blip_Synth synth;
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struct Hes_Osc oscs [osc_count];
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};
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// Init HES apu sound chip
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void Apu_init( struct Hes_Apu* this );
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// Reset HES apu couns chip
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void Apu_reset( struct Hes_Apu* this );
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void Apu_osc_output( struct Hes_Apu* this, int index, struct Blip_Buffer* center, struct Blip_Buffer* left, struct Blip_Buffer* right );
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// Emulates to time t, then writes data to addr
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void Apu_write_data( struct Hes_Apu* this, blip_time_t, int addr, int data );
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// Emulates to time t, then subtracts t from the current time.
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// OK if previous write call had time slightly after t.
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void Apu_end_frame( struct Hes_Apu* this, blip_time_t );
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static inline void Apu_volume( struct Hes_Apu* this, int v ) { Synth_volume( &this->synth, (v*9)/5 / osc_count / amp_range ); }
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#endif
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