86 lines
1.9 KiB
C++
86 lines
1.9 KiB
C++
// T6W28_Snd_Emu
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#ifndef SMS_APU_H
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#define SMS_APU_H
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namespace MDFN_IEN_NGP
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{
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typedef long sms_time_t; // clock cycle count
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}
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#include "blip_buf.h"
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#include "../../../dispatch.h"
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#include "T6W28_Oscs.h"
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namespace MDFN_IEN_NGP
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{
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typedef struct
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{
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int sq_period[3];
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int sq_phase[3];
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unsigned int noise_period;
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unsigned int noise_period_extra;
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unsigned int noise_shifter;
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unsigned int noise_tap;
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int delay[4];
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int volume_left[4];
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int volume_right[4];
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unsigned char latch_left, latch_right;
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} T6W28_ApuState;
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class T6W28_Apu {
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public:
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// Outputs can be assigned to a single buffer for mono output, or to three
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// buffers for stereo output (using Stereo_Buffer to do the mixing).
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// Assign all oscillator outputs to specified buffer(s). If buffer
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// is NULL, silences all oscillators.
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void output( blip_buffer_t* left, blip_buffer_t* right );
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// Assign single oscillator output to buffer(s). Valid indicies are 0 to 3,
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// which refer to Square 1, Square 2, Square 3, and Noise. If buffer is NULL,
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// silences oscillator.
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enum { osc_count = 4 };
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void osc_output( int index, DivDispatchOscBuffer* oscBuf );
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// Reset oscillators and internal state
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void reset();
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// Write to data port
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void write_data_left( sms_time_t, int );
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void write_data_right( sms_time_t, int );
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// Run all oscillators up to specified time, end current frame, then
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// start a new frame at time 0. Returns true if any oscillators added
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// sound to one of the left/right buffers, false if they only added
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// to the center buffer.
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bool end_frame( sms_time_t );
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public:
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T6W28_Apu();
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~T6W28_Apu();
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private:
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// noncopyable
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T6W28_Apu( const T6W28_Apu& );
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T6W28_Apu& operator = ( const T6W28_Apu& );
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T6W28_Osc* oscs [osc_count];
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T6W28_Square squares [3];
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//T6W28_Square::Synth square_synth; // used by squares
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sms_time_t last_time;
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int latch_left, latch_right;
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T6W28_Noise noise;
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void run_until( sms_time_t );
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};
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}
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#endif
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