mirror of
https://github.com/ZDoom/raze-gles.git
synced 2024-11-17 18:01:13 +00:00
718112a8fe
Currently none of these is being used, but eventually they will, once more code gets ported over. So it's better to have them right away and avoid editing the project file too much, only to revert that later.
83 lines
1.4 KiB
C
83 lines
1.4 KiB
C
// 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;
|
|
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 };
|
|
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
|