131 lines
3.5 KiB
C++
131 lines
3.5 KiB
C++
// ---------------------------------------------------------------------------
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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 software; 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 Software 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 Software
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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_FP_H__
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#define __SID_FP_H__
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#include "siddefs-fp.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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class SIDFP
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{
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public:
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SIDFP();
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~SIDFP();
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static float kinked_dac(const int x, const float nonlinearity, const int bits);
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bool sse_enabled() { return can_use_sse; }
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void set_chip_model(chip_model model);
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FilterFP& get_filter() { return filter; }
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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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void adjust_sampling_frequency(float sample_freq);
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void set_voice_nonlinearity(float nonlinearity);
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void clock();
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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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// 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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EnvelopeGeneratorFP::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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// output in range -32768 .. 32767, not clipped (AUDIO OUT)
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float output();
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protected:
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static double I0(double x);
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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 void age_bus_value(cycle_count);
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VoiceFP voice[3];
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FilterFP filter;
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ExternalFilterFP extfilt;
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PotentiometerFP potx;
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PotentiometerFP 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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float ext_in;
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enum { RINGSIZE = 16384 };
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// Sampling variables.
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sampling_method sampling;
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float cycles_per_sample;
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float sample_offset;
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int sample_index;
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int fir_N;
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int fir_RES;
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// Linear interpolation helper
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float sample_prev;
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// Ring buffer with overflow for contiguous storage of RINGSIZE samples.
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float* sample;
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// FIR_RES filter tables (FIR_N*FIR_RES).
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float* fir;
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bool can_use_sse;
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};
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#endif // not __SID_H__
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