631d22b8e5
git-svn-id: svn://svn.rockbox.org/rockbox/trunk@30278 a1c6a512-1295-4272-9138-f99709370657
51 lines
1.2 KiB
C
51 lines
1.2 KiB
C
// Konami SCC sound chip emulator
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// Game_Music_Emu 0.6-pre
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#ifndef KSS_SCC_APU_H
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#define KSS_SCC_APU_H
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#include "blargg_common.h"
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#include "blip_buffer.h"
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enum { scc_reg_count = 0xB0 }; // 0 <= reg < reg_count
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enum { scc_osc_count = 5 };
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enum { scc_amp_range = 0x8000 };
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struct scc_osc_t
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{
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int delay;
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int phase;
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int last_amp;
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struct Blip_Buffer* output;
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};
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struct Scc_Apu {
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struct scc_osc_t oscs [scc_osc_count];
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blip_time_t last_time;
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unsigned char regs [scc_reg_count];
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struct Blip_Synth synth;
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};
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void Scc_init( struct Scc_Apu* this );
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// Resets sound chip
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void Scc_reset( struct Scc_Apu* this );
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// Set overall volume, where 1.0 is normal
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void Scc_volume( struct Scc_Apu* this, int v );
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static inline void Scc_set_output( struct Scc_Apu* this, int index, struct Blip_Buffer* b )
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{
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assert( (unsigned) index < scc_osc_count );
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this->oscs [index].output = b;
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}
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// Emulates to time t, then writes data to reg
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void Scc_write( struct Scc_Apu* this, blip_time_t time, int addr, int data ) ICODE_ATTR;
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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 Scc_end_frame( struct Scc_Apu* this, blip_time_t end_time ) ICODE_ATTR;
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#endif
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