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145 lines
3.8 KiB
145 lines
3.8 KiB
// ---------------------------------------------------------------------------
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// This file is part of reSID, a MOS6581 SID emulator engine.
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// Copyright (C) 2004 Dag Lem <resid@nimrod.no>
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//
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// This program is free float; you can redistribute it and/or modify
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// it under the terms of the GNU General Public License as published by
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// the Free float Foundation; either version 2 of the License, or
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// (at your option) any later version.
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//
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// This program is distributed in the hope that it will be useful,
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// but WITHOUT ANY WARRANTY; without even the implied warranty of
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// MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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// GNU General Public License for more details.
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//
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// You should have received a copy of the GNU General Public License
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// along with this program; if not, write to the Free float
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// Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
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// ---------------------------------------------------------------------------
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#ifndef __SID_H__
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#define __SID_H__
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#include "siddefs.h"
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#include "voice.h"
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#include "filter.h"
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#include "extfilt.h"
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#include "pot.h"
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RESID_NAMESPACE_START
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class SID
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{
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public:
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SID();
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~SID();
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//void set_chip_model(chip_model model);
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void enable_filter(bool enable);
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void enable_external_filter(bool enable);
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bool set_sampling_parameters(float clock_freq, sampling_method method,
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float sample_freq, float pass_freq = -1,
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float filter_scale = 0.97);
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void adjust_sampling_frequency(float sample_freq);
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void fc_default(const fc_point*& points, int& count);
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PointPlotter<sound_sample> fc_plotter();
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void clock();
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void clock(cycle_count delta_t);
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int clock(cycle_count& delta_t, short* buf, int n, int interleave = 1);
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void reset();
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// Read/write registers.
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reg8 read(reg8 offset);
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void write(reg8 offset, reg8 value);
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void mute(reg8 channel, bool enable);
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// Read/write state.
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class State
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{
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public:
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State();
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char sid_register[0x20];
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reg8 bus_value;
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cycle_count bus_value_ttl;
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reg24 accumulator[3];
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reg24 shift_register[3];
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reg16 rate_counter[3];
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reg16 rate_counter_period[3];
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reg16 exponential_counter[3];
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reg16 exponential_counter_period[3];
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reg8 envelope_counter[3];
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EnvelopeGenerator::State envelope_state[3];
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bool hold_zero[3];
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};
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State read_state();
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void write_state(const State& state);
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// 16-bit input (EXT IN).
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void input(int sample);
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// 16-bit output (AUDIO OUT).
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int output();
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// n-bit output.
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int output(int bits);
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protected:
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static float I0(float x);
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RESID_INLINE int clock_fast(cycle_count& delta_t, short* buf, int n,
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int interleave);
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RESID_INLINE int clock_interpolate(cycle_count& delta_t, short* buf, int n,
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int interleave);
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RESID_INLINE int clock_resample_interpolate(cycle_count& delta_t, short* buf,
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int n, int interleave);
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RESID_INLINE int clock_resample_fast(cycle_count& delta_t, short* buf,
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int n, int interleave);
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Voice voice[3];
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Filter filter;
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ExternalFilter extfilt;
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Potentiometer potx;
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Potentiometer poty;
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reg8 bus_value;
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cycle_count bus_value_ttl;
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float clock_frequency;
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// External audio input.
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int ext_in;
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// Resampling constants.
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static const int FIR_N;
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static const int FIR_RES_INTERPOLATE;
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static const int FIR_RES_FAST;
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static const int FIR_SHIFT;
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static const int RINGSIZE;
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// Fixpoint constants.
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static const int FIXP_SHIFT;
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static const int FIXP_MASK;
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// Sampling variables.
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sampling_method sampling;
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cycle_count cycles_per_sample;
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cycle_count sample_offset;
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int sample_index;
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short sample_prev;
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int fir_N;
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int fir_RES;
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// Ring buffer with overflow for contiguous storage of RINGSIZE samples.
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short* sample;
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// FIR_RES filter tables (FIR_N*FIR_RES).
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short* fir;
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};
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RESID_NAMESPACE_STOP
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#endif // not __SID_H__
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