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