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Large Pack of OldSkool DOS MOD Trackers
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resid-fp
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sid.h
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C/C++ Source or Header
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2009-01-03
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131 lines
// ---------------------------------------------------------------------------
// This file is part of reSID, a MOS6581 SID emulator engine.
// Copyright (C) 2004 Dag Lem <resid@nimrod.no>
//
// This program is free software; you can redistribute it and/or modify
// it under the terms of the GNU General Public License as published by
// the Free Software Foundation; either version 2 of the License, or
// (at your option) any later version.
//
// This program is distributed in the hope that it will be useful,
// but WITHOUT ANY WARRANTY; without even the implied warranty of
// MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
// GNU General Public License for more details.
//
// You should have received a copy of the GNU General Public License
// along with this program; if not, write to the Free Software
// Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
// ---------------------------------------------------------------------------
#ifndef __SID_FP_H__
#define __SID_FP_H__
#include "siddefs-fp.h"
#include "voice.h"
#include "filter.h"
#include "extfilt.h"
#include "pot.h"
class SIDFP
{
public:
SIDFP();
~SIDFP();
static float kinked_dac(const int x, const float nonlinearity, const int bits);
bool sse_enabled() { return can_use_sse; }
void set_chip_model(chip_model model);
FilterFP& get_filter() { return filter; }
void enable_filter(bool enable);
void enable_external_filter(bool enable);
bool set_sampling_parameters(float clock_freq, sampling_method method,
float sample_freq, float pass_freq = -1);
void adjust_sampling_frequency(float sample_freq);
void set_voice_nonlinearity(float nonlinearity);
void clock();
int clock(cycle_count& delta_t, short* buf, int n, int interleave = 1);
void reset();
// Read/write registers.
reg8 read(reg8 offset);
void write(reg8 offset, reg8 value);
// Read/write state.
class State
{
public:
State();
char sid_register[0x20];
reg8 bus_value;
cycle_count bus_value_ttl;
reg24 accumulator[3];
reg24 shift_register[3];
reg16 rate_counter[3];
reg16 rate_counter_period[3];
reg16 exponential_counter[3];
reg16 exponential_counter_period[3];
reg8 envelope_counter[3];
EnvelopeGeneratorFP::State envelope_state[3];
bool hold_zero[3];
};
State read_state();
void write_state(const State& state);
// 16-bit input (EXT IN).
void input(int sample);
// output in range -32768 .. 32767, not clipped (AUDIO OUT)
float output();
protected:
static double I0(double x);
RESID_INLINE int clock_interpolate(cycle_count& delta_t, short* buf, int n,
int interleave);
RESID_INLINE int clock_resample_interpolate(cycle_count& delta_t, short* buf,
int n, int interleave);
RESID_INLINE void age_bus_value(cycle_count);
VoiceFP voice[3];
FilterFP filter;
ExternalFilterFP extfilt;
PotentiometerFP potx;
PotentiometerFP poty;
reg8 bus_value;
cycle_count bus_value_ttl;
float clock_frequency;
// External audio input.
float ext_in;
enum { RINGSIZE = 16384 };
// Sampling variables.
sampling_method sampling;
float cycles_per_sample;
float sample_offset;
int sample_index;
int fir_N;
int fir_RES;
// Linear interpolation helper
float sample_prev;
// Ring buffer with overflow for contiguous storage of RINGSIZE samples.
float* sample;
// FIR_RES filter tables (FIR_N*FIR_RES).
float* fir;
bool can_use_sse;
};
#endif // not __SID_H__