Innovation SSI-2001 emulation. Using ReSID-FP.

src/resid-fp/sid.h

@@ -0,0 +1,130 @@
+//  ---------------------------------------------------------------------------
+//  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__