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// Private oscillators used by Gb_Apu
// Gb_Snd_Emu 0.1.5
#ifndef GB_OSCS_H
#define GB_OSCS_H
#include "blargg_common.h"
#include "Blip_Buffer.h"
struct Gb_Osc
{
enum { trigger = 0x80 };
enum { len_enabled_mask = 0x40 };
Blip_Buffer* outputs [4]; // NULL, right, left, center
Blip_Buffer* output;
int output_select;
BOOST::uint8_t* regs; // osc's 5 registers
int delay;
int last_amp;
int volume;
int length;
int enabled;
void reset();
void clock_length();
int frequency() const { return (regs [4] & 7) * 0x100 + regs [3]; }
};
struct Gb_Env : Gb_Osc
{
int env_delay;
void reset();
void clock_envelope();
bool write_register( int, int );
};
struct Gb_Square : Gb_Env
{
enum { period_mask = 0x70 };
enum { shift_mask = 0x07 };
typedef Blip_Synth<blip_good_quality,1> Synth;
Synth const* synth;
int sweep_delay;
int sweep_freq;
int phase;
void reset();
void clock_sweep();
void run( blip_time_t, blip_time_t, int playing );
};
struct Gb_Noise : Gb_Env
{
typedef Blip_Synth<blip_med_quality,1> Synth;
Synth const* synth;
unsigned bits;
void run( blip_time_t, blip_time_t, int playing );
};
struct Gb_Wave : Gb_Osc
{
typedef Blip_Synth<blip_med_quality,1> Synth;
Synth const* synth;
int wave_pos;
enum { wave_size = 32 };
BOOST::uint8_t wave [wave_size];
void write_register( int, int );
void run( blip_time_t, blip_time_t, int playing );
};
inline void Gb_Env::reset()
{
env_delay = 0;
Gb_Osc::reset();
}
#endif
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