mirror of
https://github.com/Oibaf66/frodo-wii.git
synced 2024-11-10 21:55:11 +01:00
1274 lines
38 KiB
C++
1274 lines
38 KiB
C++
/*
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* SID.cpp - 6581 emulation
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*
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* Frodo (C) 1994-1997,2002-2005 Christian Bauer
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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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/*
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* Incompatibilities:
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* ------------------
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*
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* - Lots of empirically determined constants in the filter calculations
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*/
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#include "sysdeps.h"
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#include <math.h>
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#include "SID.h"
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#include "Prefs.h"
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#include "Network.h"
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#ifdef USE_FIXPOINT_MATHS
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#include "FixPoint.h"
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#endif
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/*
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* Resonance frequency polynomials
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*/
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#define CALC_RESONANCE_LP(f) (227.755\
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- 1.7635 * f\
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- 0.0176385 * f * f\
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+ 0.00333484 * f * f * f\
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- 9.05683E-6 * f * f * f * f)
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#define CALC_RESONANCE_HP(f) (366.374\
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- 14.0052 * f\
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+ 0.603212 * f * f\
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- 0.000880196 * f * f * f)
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/*
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* Random number generator for noise waveform
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*/
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static uint8 sid_random(void);
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static uint8 sid_random(void)
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{
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static uint32 seed = 1;
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seed = seed * 1103515245 + 12345;
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return seed >> 16;
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}
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/*
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* Constructor
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*/
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MOS6581::MOS6581(C64 *c64) : the_c64(c64)
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{
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the_renderer = NULL;
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for (int i=0; i<32; i++)
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regs[i] = 0;
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// Open the renderer
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open_close_renderer(SIDTYPE_NONE, ThePrefs.SIDType);
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}
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/*
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* Destructor
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*/
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MOS6581::~MOS6581()
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{
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// Close the renderer
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open_close_renderer(ThePrefs.SIDType, SIDTYPE_NONE);
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}
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/*
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* Reset the SID
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*/
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void MOS6581::Reset(void)
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{
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for (int i=0; i<32; i++)
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regs[i] = 0;
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last_sid_byte = 0;
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// Reset the renderer
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if (the_renderer != NULL)
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the_renderer->Reset();
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}
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/*
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* Preferences may have changed
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*/
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void MOS6581::NewPrefs(Prefs *prefs)
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{
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open_close_renderer(ThePrefs.SIDType, prefs->SIDType);
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if (the_renderer != NULL)
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the_renderer->NewPrefs(prefs);
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}
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/*
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* Pause sound output
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*/
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void MOS6581::PauseSound(void)
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{
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if (the_renderer != NULL)
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the_renderer->Pause();
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}
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/*
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* Resume sound output
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*/
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void MOS6581::ResumeSound(void)
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{
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if (the_renderer != NULL)
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the_renderer->Resume();
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}
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/*
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* Get SID state
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*/
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void MOS6581::GetState(MOS6581State *ss)
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{
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ss->freq_lo_1 = regs[0];
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ss->freq_hi_1 = regs[1];
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ss->pw_lo_1 = regs[2];
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ss->pw_hi_1 = regs[3];
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ss->ctrl_1 = regs[4];
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ss->AD_1 = regs[5];
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ss->SR_1 = regs[6];
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ss->freq_lo_2 = regs[7];
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ss->freq_hi_2 = regs[8];
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ss->pw_lo_2 = regs[9];
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ss->pw_hi_2 = regs[10];
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ss->ctrl_2 = regs[11];
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ss->AD_2 = regs[12];
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ss->SR_2 = regs[13];
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ss->freq_lo_3 = regs[14];
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ss->freq_hi_3 = regs[15];
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ss->pw_lo_3 = regs[16];
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ss->pw_hi_3 = regs[17];
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ss->ctrl_3 = regs[18];
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ss->AD_3 = regs[19];
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ss->SR_3 = regs[20];
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ss->fc_lo = regs[21];
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ss->fc_hi = regs[22];
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ss->res_filt = regs[23];
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ss->mode_vol = regs[24];
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ss->pot_x = 0xff;
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ss->pot_y = 0xff;
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ss->osc_3 = 0;
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ss->env_3 = 0;
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}
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/*
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* Restore SID state
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*/
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void MOS6581::SetState(MOS6581State *ss)
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{
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regs[0] = ss->freq_lo_1;
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regs[1] = ss->freq_hi_1;
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regs[2] = ss->pw_lo_1;
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regs[3] = ss->pw_hi_1;
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regs[4] = ss->ctrl_1;
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regs[5] = ss->AD_1;
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regs[6] = ss->SR_1;
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regs[7] = ss->freq_lo_2;
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regs[8] = ss->freq_hi_2;
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regs[9] = ss->pw_lo_2;
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regs[10] = ss->pw_hi_2;
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regs[11] = ss->ctrl_2;
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regs[12] = ss->AD_2;
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regs[13] = ss->SR_2;
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regs[14] = ss->freq_lo_3;
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regs[15] = ss->freq_hi_3;
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regs[16] = ss->pw_lo_3;
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regs[17] = ss->pw_hi_3;
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regs[18] = ss->ctrl_3;
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regs[19] = ss->AD_3;
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regs[20] = ss->SR_3;
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regs[21] = ss->fc_lo;
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regs[22] = ss->fc_hi;
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regs[23] = ss->res_filt;
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regs[24] = ss->mode_vol;
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// Stuff the new register values into the renderer
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if (the_renderer != NULL)
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for (int i=0; i<25; i++)
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the_renderer->WriteRegister(i, regs[i]);
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}
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/**
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** Renderer for digital SID emulation (SIDTYPE_DIGITAL)
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**/
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const uint32 SAMPLE_FREQ = 32000; // Sample output frequency in Hz
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const uint32 SID_FREQ = 985248; // SID frequency in Hz
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const uint32 CALC_FREQ = 50; // Frequency at which calc_buffer is called in Hz (should be 50Hz)
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const uint32 SID_CYCLES = SID_FREQ/SAMPLE_FREQ; // # of SID clocks per sample frame
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const int SAMPLE_BUF_SIZE = 0x138*2;// Size of buffer for sampled voice (double buffered)
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// SID waveforms (some of them :-)
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enum {
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WAVE_NONE,
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WAVE_TRI,
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WAVE_SAW,
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WAVE_TRISAW,
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WAVE_RECT,
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WAVE_TRIRECT,
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WAVE_SAWRECT,
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WAVE_TRISAWRECT,
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WAVE_NOISE
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};
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// EG states
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enum {
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EG_IDLE,
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EG_ATTACK,
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EG_DECAY,
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EG_RELEASE
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};
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// Filter types
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enum {
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FILT_NONE,
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FILT_LP,
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FILT_BP,
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FILT_LPBP,
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FILT_HP,
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FILT_NOTCH,
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FILT_HPBP,
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FILT_ALL
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};
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// Structure for one voice
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struct DRVoice {
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int wave; // Selected waveform
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int eg_state; // Current state of EG
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DRVoice *mod_by; // Voice that modulates this one
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DRVoice *mod_to; // Voice that is modulated by this one
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uint32 count; // Counter for waveform generator, 8.16 fixed
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uint32 add; // Added to counter in every frame
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uint16 freq; // SID frequency value
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uint16 pw; // SID pulse-width value
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uint32 a_add; // EG parameters
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uint32 d_sub;
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uint32 s_level;
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uint32 r_sub;
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uint32 eg_level; // Current EG level, 8.16 fixed
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uint32 noise; // Last noise generator output value
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bool gate; // EG gate bit
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bool ring; // Ring modulation bit
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bool test; // Test bit
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bool filter; // Flag: Voice filtered
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// The following bit is set for the modulating
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// voice, not for the modulated one (as the SID bits)
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bool sync; // Sync modulation bit
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bool mute; // Voice muted (voice 3 only)
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};
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// Renderer class
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class DigitalRenderer : public SIDRenderer {
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public:
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DigitalRenderer();
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virtual ~DigitalRenderer();
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virtual void Reset(void);
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virtual void PushVolume(uint8 volume);
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virtual void EmulateLine(void);
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virtual void WriteRegister(uint16 adr, uint8 byte);
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virtual void NewPrefs(Prefs *prefs);
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virtual void Pause(void);
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virtual void Resume(void);
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private:
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void init_sound(void);
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void calc_filter(void);
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void calc_buffer(int16 *buf, long count);
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bool ready; // Flag: Renderer has initialized and is ready
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uint8 volume; // Master volume
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static uint16 TriTable[0x1000*2]; // Tables for certain waveforms
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static const uint16 TriSawTable[0x100];
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static const uint16 TriRectTable[0x100];
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static const uint16 SawRectTable[0x100];
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static const uint16 TriSawRectTable[0x100];
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static const uint32 EGTable[16]; // Increment/decrement values for all A/D/R settings
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static const uint8 EGDRShift[256]; // For exponential approximation of D/R
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static const int16 SampleTab[16]; // Table for sampled voice
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DRVoice voice[3]; // Data for 3 voices
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uint8 f_type; // Filter type
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uint8 f_freq; // SID filter frequency (upper 8 bits)
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uint8 f_res; // Filter resonance (0..15)
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#ifdef USE_FIXPOINT_MATHS
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FixPoint f_ampl;
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FixPoint d1, d2, g1, g2;
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int32 xn1, xn2, yn1, yn2; // can become very large
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FixPoint sidquot;
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#ifdef PRECOMPUTE_RESONANCE
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FixPoint resonanceLP[256];
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FixPoint resonanceHP[256];
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#endif
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#else
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float f_ampl; // IIR filter input attenuation
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float d1, d2, g1, g2; // IIR filter coefficients
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float xn1, xn2, yn1, yn2; // IIR filter previous input/output signal
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#ifdef PRECOMPUTE_RESONANCE
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float resonanceLP[256]; // shortcut for calc_filter
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float resonanceHP[256];
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#endif
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#endif
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uint8 sample_buf[SAMPLE_BUF_SIZE]; // Buffer for sampled voice
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int sample_in_ptr; // Index in sample_buf for writing
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#if defined(__linux__) || defined(GEKKO)
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int devfd, sndbufsize, buffer_rate;
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int16 *sound_buffer;
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#endif
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};
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// Static data members
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uint16 DigitalRenderer::TriTable[0x1000*2];
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#ifndef EMUL_MOS8580
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// Sampled from a 6581R4
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const uint16 DigitalRenderer::TriSawTable[0x100] = {
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0x0000, 0x0000, 0x0000, 0x0000, 0x0000, 0x0000, 0x0000, 0x0000,
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0x0000, 0x0000, 0x0000, 0x0000, 0x0000, 0x0000, 0x0000, 0x0000,
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0x0000, 0x0000, 0x0000, 0x0000, 0x0000, 0x0000, 0x0000, 0x0000,
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0x0000, 0x0000, 0x0000, 0x0000, 0x0000, 0x0000, 0x0000, 0x0000,
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0x0000, 0x0000, 0x0000, 0x0000, 0x0000, 0x0000, 0x0000, 0x0000,
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0x0000, 0x0000, 0x0000, 0x0000, 0x0000, 0x0000, 0x0000, 0x0000,
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0x0000, 0x0000, 0x0000, 0x0000, 0x0000, 0x0000, 0x0000, 0x0000,
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0x0000, 0x0000, 0x0000, 0x0000, 0x0000, 0x0000, 0x0000, 0x0808,
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0x0000, 0x0000, 0x0000, 0x0000, 0x0000, 0x0000, 0x0000, 0x0000,
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0x0000, 0x0000, 0x0000, 0x0000, 0x0000, 0x0000, 0x0000, 0x0000,
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0x0000, 0x0000, 0x0000, 0x0000, 0x0000, 0x0000, 0x0000, 0x0000,
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0x0000, 0x0000, 0x0000, 0x0000, 0x0000, 0x0000, 0x0000, 0x0000,
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0x0000, 0x0000, 0x0000, 0x0000, 0x0000, 0x0000, 0x0000, 0x0000,
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0x0000, 0x0000, 0x0000, 0x0000, 0x0000, 0x0000, 0x0000, 0x0000,
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0x0000, 0x0000, 0x0000, 0x0000, 0x0000, 0x0000, 0x0000, 0x0000,
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0x0000, 0x0000, 0x0000, 0x0000, 0x0000, 0x0000, 0x1010, 0x3C3C,
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0x0000, 0x0000, 0x0000, 0x0000, 0x0000, 0x0000, 0x0000, 0x0000,
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0x0000, 0x0000, 0x0000, 0x0000, 0x0000, 0x0000, 0x0000, 0x0000,
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0x0000, 0x0000, 0x0000, 0x0000, 0x0000, 0x0000, 0x0000, 0x0000,
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0x0000, 0x0000, 0x0000, 0x0000, 0x0000, 0x0000, 0x0000, 0x0000,
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0x0000, 0x0000, 0x0000, 0x0000, 0x0000, 0x0000, 0x0000, 0x0000,
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0x0000, 0x0000, 0x0000, 0x0000, 0x0000, 0x0000, 0x0000, 0x0000,
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0x0000, 0x0000, 0x0000, 0x0000, 0x0000, 0x0000, 0x0000, 0x0000,
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0x0000, 0x0000, 0x0000, 0x0000, 0x0000, 0x0000, 0x0000, 0x0808,
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0x0000, 0x0000, 0x0000, 0x0000, 0x0000, 0x0000, 0x0000, 0x0000,
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0x0000, 0x0000, 0x0000, 0x0000, 0x0000, 0x0000, 0x0000, 0x0000,
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0x0000, 0x0000, 0x0000, 0x0000, 0x0000, 0x0000, 0x0000, 0x0000,
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0x0000, 0x0000, 0x0000, 0x0000, 0x0000, 0x0000, 0x0000, 0x0000,
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0x0000, 0x0000, 0x0000, 0x0000, 0x0000, 0x0000, 0x0000, 0x0000,
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0x0000, 0x0000, 0x0000, 0x0000, 0x0000, 0x0000, 0x0000, 0x0000,
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0x0000, 0x0000, 0x0000, 0x0000, 0x0000, 0x0000, 0x0000, 0x0000,
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0x0000, 0x0000, 0x0000, 0x0000, 0x0000, 0x0000, 0x1010, 0x3C3C
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};
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const uint16 DigitalRenderer::TriRectTable[0x100] = {
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0x0000, 0x0000, 0x0000, 0x0000, 0x0000, 0x0000, 0x0000, 0x0000,
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0x0000, 0x0000, 0x0000, 0x0000, 0x0000, 0x0000, 0x0000, 0x0000,
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0x0000, 0x0000, 0x0000, 0x0000, 0x0000, 0x0000, 0x0000, 0x0000,
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0x0000, 0x0000, 0x0000, 0x0000, 0x0000, 0x0000, 0x0000, 0x0000,
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0x0000, 0x0000, 0x0000, 0x0000, 0x0000, 0x0000, 0x0000, 0x0000,
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0x0000, 0x0000, 0x0000, 0x0000, 0x0000, 0x0000, 0x0000, 0x0000,
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0x0000, 0x0000, 0x0000, 0x0000, 0x0000, 0x0000, 0x0000, 0x0000,
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0x0000, 0x0000, 0x0000, 0x0000, 0x0000, 0x0000, 0x0000, 0x0000,
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0x0000, 0x0000, 0x0000, 0x0000, 0x0000, 0x0000, 0x0000, 0x0000,
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0x0000, 0x0000, 0x0000, 0x0000, 0x0000, 0x0000, 0x0000, 0x0000,
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0x0000, 0x0000, 0x0000, 0x0000, 0x0000, 0x0000, 0x0000, 0x0000,
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0x0000, 0x0000, 0x0000, 0x0000, 0x0000, 0x0000, 0x0000, 0x8080,
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0x0000, 0x0000, 0x0000, 0x0000, 0x0000, 0x0000, 0x0000, 0x0000,
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0x0000, 0x0000, 0x0000, 0x0000, 0x0000, 0x0000, 0x0000, 0x8080,
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0x0000, 0x0000, 0x0000, 0x0000, 0x0000, 0x0000, 0x8080, 0xC0C0,
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0x0000, 0x8080, 0x8080, 0xE0E0, 0x8080, 0xE0E0, 0xF0F0, 0xFCFC,
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0xFFFF, 0xFCFC, 0xFAFA, 0xF0F0, 0xF6F6, 0xE0E0, 0xE0E0, 0x8080,
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0xEEEE, 0xE0E0, 0xE0E0, 0x8080, 0xC0C0, 0x0000, 0x0000, 0x0000,
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0xDEDE, 0xC0C0, 0xC0C0, 0x0000, 0x8080, 0x0000, 0x0000, 0x0000,
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0x8080, 0x0000, 0x0000, 0x0000, 0x0000, 0x0000, 0x0000, 0x0000,
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0xBEBE, 0x8080, 0x8080, 0x0000, 0x8080, 0x0000, 0x0000, 0x0000,
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0x8080, 0x0000, 0x0000, 0x0000, 0x0000, 0x0000, 0x0000, 0x0000,
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0x0000, 0x0000, 0x0000, 0x0000, 0x0000, 0x0000, 0x0000, 0x0000,
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0x0000, 0x0000, 0x0000, 0x0000, 0x0000, 0x0000, 0x0000, 0x0000,
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0x7E7E, 0x4040, 0x0000, 0x0000, 0x0000, 0x0000, 0x0000, 0x0000,
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0x0000, 0x0000, 0x0000, 0x0000, 0x0000, 0x0000, 0x0000, 0x0000,
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0x0000, 0x0000, 0x0000, 0x0000, 0x0000, 0x0000, 0x0000, 0x0000,
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0x0000, 0x0000, 0x0000, 0x0000, 0x0000, 0x0000, 0x0000, 0x0000,
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0x0000, 0x0000, 0x0000, 0x0000, 0x0000, 0x0000, 0x0000, 0x0000,
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0x0000, 0x0000, 0x0000, 0x0000, 0x0000, 0x0000, 0x0000, 0x0000,
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0x0000, 0x0000, 0x0000, 0x0000, 0x0000, 0x0000, 0x0000, 0x0000,
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0x0000, 0x0000, 0x0000, 0x0000, 0x0000, 0x0000, 0x0000, 0x0000
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};
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|
|
const uint16 DigitalRenderer::SawRectTable[0x100] = {
|
|
0x0000, 0x0000, 0x0000, 0x0000, 0x0000, 0x0000, 0x0000, 0x0000,
|
|
0x0000, 0x0000, 0x0000, 0x0000, 0x0000, 0x0000, 0x0000, 0x0000,
|
|
0x0000, 0x0000, 0x0000, 0x0000, 0x0000, 0x0000, 0x0000, 0x0000,
|
|
0x0000, 0x0000, 0x0000, 0x0000, 0x0000, 0x0000, 0x0000, 0x0000,
|
|
0x0000, 0x0000, 0x0000, 0x0000, 0x0000, 0x0000, 0x0000, 0x0000,
|
|
0x0000, 0x0000, 0x0000, 0x0000, 0x0000, 0x0000, 0x0000, 0x0000,
|
|
0x0000, 0x0000, 0x0000, 0x0000, 0x0000, 0x0000, 0x0000, 0x0000,
|
|
0x0000, 0x0000, 0x0000, 0x0000, 0x0000, 0x0000, 0x0000, 0x0000,
|
|
0x0000, 0x0000, 0x0000, 0x0000, 0x0000, 0x0000, 0x0000, 0x0000,
|
|
0x0000, 0x0000, 0x0000, 0x0000, 0x0000, 0x0000, 0x0000, 0x0000,
|
|
0x0000, 0x0000, 0x0000, 0x0000, 0x0000, 0x0000, 0x0000, 0x0000,
|
|
0x0000, 0x0000, 0x0000, 0x0000, 0x0000, 0x0000, 0x0000, 0x0000,
|
|
0x0000, 0x0000, 0x0000, 0x0000, 0x0000, 0x0000, 0x0000, 0x0000,
|
|
0x0000, 0x0000, 0x0000, 0x0000, 0x0000, 0x0000, 0x0000, 0x0000,
|
|
0x0000, 0x0000, 0x0000, 0x0000, 0x0000, 0x0000, 0x0000, 0x0000,
|
|
0x0000, 0x0000, 0x0000, 0x0000, 0x0000, 0x0000, 0x0000, 0x7878,
|
|
0x0000, 0x0000, 0x0000, 0x0000, 0x0000, 0x0000, 0x0000, 0x0000,
|
|
0x0000, 0x0000, 0x0000, 0x0000, 0x0000, 0x0000, 0x0000, 0x0000,
|
|
0x0000, 0x0000, 0x0000, 0x0000, 0x0000, 0x0000, 0x0000, 0x0000,
|
|
0x0000, 0x0000, 0x0000, 0x0000, 0x0000, 0x0000, 0x0000, 0x0000,
|
|
0x0000, 0x0000, 0x0000, 0x0000, 0x0000, 0x0000, 0x0000, 0x0000,
|
|
0x0000, 0x0000, 0x0000, 0x0000, 0x0000, 0x0000, 0x0000, 0x0000,
|
|
0x0000, 0x0000, 0x0000, 0x0000, 0x0000, 0x0000, 0x0000, 0x0000,
|
|
0x0000, 0x0000, 0x0000, 0x0000, 0x0000, 0x0000, 0x0000, 0x0000,
|
|
0x0000, 0x0000, 0x0000, 0x0000, 0x0000, 0x0000, 0x0000, 0x0000,
|
|
0x0000, 0x0000, 0x0000, 0x0000, 0x0000, 0x0000, 0x0000, 0x0000,
|
|
0x0000, 0x0000, 0x0000, 0x0000, 0x0000, 0x0000, 0x0000, 0x0000,
|
|
0x0000, 0x0000, 0x0000, 0x0000, 0x0000, 0x0000, 0x0000, 0x0000,
|
|
0x0000, 0x0000, 0x0000, 0x0000, 0x0000, 0x0000, 0x0000, 0x0000,
|
|
0x0000, 0x0000, 0x0000, 0x0000, 0x0000, 0x0000, 0x0000, 0x0000,
|
|
0x0000, 0x0000, 0x0000, 0x0000, 0x0000, 0x0000, 0x0000, 0x0000,
|
|
0x0000, 0x0000, 0x0000, 0x0000, 0x0000, 0x0000, 0x0000, 0x7878
|
|
};
|
|
|
|
const uint16 DigitalRenderer::TriSawRectTable[0x100] = {
|
|
0x0000, 0x0000, 0x0000, 0x0000, 0x0000, 0x0000, 0x0000, 0x0000,
|
|
0x0000, 0x0000, 0x0000, 0x0000, 0x0000, 0x0000, 0x0000, 0x0000,
|
|
0x0000, 0x0000, 0x0000, 0x0000, 0x0000, 0x0000, 0x0000, 0x0000,
|
|
0x0000, 0x0000, 0x0000, 0x0000, 0x0000, 0x0000, 0x0000, 0x0000,
|
|
0x0000, 0x0000, 0x0000, 0x0000, 0x0000, 0x0000, 0x0000, 0x0000,
|
|
0x0000, 0x0000, 0x0000, 0x0000, 0x0000, 0x0000, 0x0000, 0x0000,
|
|
0x0000, 0x0000, 0x0000, 0x0000, 0x0000, 0x0000, 0x0000, 0x0000,
|
|
0x0000, 0x0000, 0x0000, 0x0000, 0x0000, 0x0000, 0x0000, 0x0000,
|
|
0x0000, 0x0000, 0x0000, 0x0000, 0x0000, 0x0000, 0x0000, 0x0000,
|
|
0x0000, 0x0000, 0x0000, 0x0000, 0x0000, 0x0000, 0x0000, 0x0000,
|
|
0x0000, 0x0000, 0x0000, 0x0000, 0x0000, 0x0000, 0x0000, 0x0000,
|
|
0x0000, 0x0000, 0x0000, 0x0000, 0x0000, 0x0000, 0x0000, 0x0000,
|
|
0x0000, 0x0000, 0x0000, 0x0000, 0x0000, 0x0000, 0x0000, 0x0000,
|
|
0x0000, 0x0000, 0x0000, 0x0000, 0x0000, 0x0000, 0x0000, 0x0000,
|
|
0x0000, 0x0000, 0x0000, 0x0000, 0x0000, 0x0000, 0x0000, 0x0000,
|
|
0x0000, 0x0000, 0x0000, 0x0000, 0x0000, 0x0000, 0x0000, 0x0000,
|
|
0x0000, 0x0000, 0x0000, 0x0000, 0x0000, 0x0000, 0x0000, 0x0000,
|
|
0x0000, 0x0000, 0x0000, 0x0000, 0x0000, 0x0000, 0x0000, 0x0000,
|
|
0x0000, 0x0000, 0x0000, 0x0000, 0x0000, 0x0000, 0x0000, 0x0000,
|
|
0x0000, 0x0000, 0x0000, 0x0000, 0x0000, 0x0000, 0x0000, 0x0000,
|
|
0x0000, 0x0000, 0x0000, 0x0000, 0x0000, 0x0000, 0x0000, 0x0000,
|
|
0x0000, 0x0000, 0x0000, 0x0000, 0x0000, 0x0000, 0x0000, 0x0000,
|
|
0x0000, 0x0000, 0x0000, 0x0000, 0x0000, 0x0000, 0x0000, 0x0000,
|
|
0x0000, 0x0000, 0x0000, 0x0000, 0x0000, 0x0000, 0x0000, 0x0000,
|
|
0x0000, 0x0000, 0x0000, 0x0000, 0x0000, 0x0000, 0x0000, 0x0000,
|
|
0x0000, 0x0000, 0x0000, 0x0000, 0x0000, 0x0000, 0x0000, 0x0000,
|
|
0x0000, 0x0000, 0x0000, 0x0000, 0x0000, 0x0000, 0x0000, 0x0000,
|
|
0x0000, 0x0000, 0x0000, 0x0000, 0x0000, 0x0000, 0x0000, 0x0000,
|
|
0x0000, 0x0000, 0x0000, 0x0000, 0x0000, 0x0000, 0x0000, 0x0000,
|
|
0x0000, 0x0000, 0x0000, 0x0000, 0x0000, 0x0000, 0x0000, 0x0000,
|
|
0x0000, 0x0000, 0x0000, 0x0000, 0x0000, 0x0000, 0x0000, 0x0000,
|
|
0x0000, 0x0000, 0x0000, 0x0000, 0x0000, 0x0000, 0x0000, 0x0000
|
|
};
|
|
#else
|
|
// Sampled from an 8580R5
|
|
const uint16 DigitalRenderer::TriSawTable[0x100] = {
|
|
0x0000, 0x0000, 0x0000, 0x0000, 0x0000, 0x0000, 0x0000, 0x0000,
|
|
0x0000, 0x0000, 0x0000, 0x0000, 0x0000, 0x0000, 0x0000, 0x0000,
|
|
0x0000, 0x0000, 0x0000, 0x0000, 0x0000, 0x0000, 0x0000, 0x0000,
|
|
0x0000, 0x0000, 0x0000, 0x0000, 0x0000, 0x0000, 0x0000, 0x0000,
|
|
0x0000, 0x0000, 0x0000, 0x0000, 0x0000, 0x0000, 0x0000, 0x0000,
|
|
0x0000, 0x0000, 0x0000, 0x0000, 0x0000, 0x0000, 0x0000, 0x0000,
|
|
0x0000, 0x0000, 0x0000, 0x0000, 0x0000, 0x0000, 0x0000, 0x0000,
|
|
0x0000, 0x0000, 0x0000, 0x0000, 0x0000, 0x0000, 0x0000, 0x0808,
|
|
0x0000, 0x0000, 0x0000, 0x0000, 0x0000, 0x0000, 0x0000, 0x0000,
|
|
0x0000, 0x0000, 0x0000, 0x0000, 0x0000, 0x0000, 0x0000, 0x0000,
|
|
0x0000, 0x0000, 0x0000, 0x0000, 0x0000, 0x0000, 0x0000, 0x0000,
|
|
0x0000, 0x0000, 0x0000, 0x0000, 0x0000, 0x0000, 0x0000, 0x0000,
|
|
0x0000, 0x0000, 0x0000, 0x0000, 0x0000, 0x0000, 0x0000, 0x0000,
|
|
0x0000, 0x0000, 0x0000, 0x0000, 0x0000, 0x0000, 0x0000, 0x0000,
|
|
0x0000, 0x0000, 0x0000, 0x0000, 0x0000, 0x0000, 0x0000, 0x0000,
|
|
0x0000, 0x0000, 0x0000, 0x0000, 0x0000, 0x0000, 0x1818, 0x3C3C,
|
|
0x0000, 0x0000, 0x0000, 0x0000, 0x0000, 0x0000, 0x0000, 0x0000,
|
|
0x0000, 0x0000, 0x0000, 0x0000, 0x0000, 0x0000, 0x0000, 0x0000,
|
|
0x0000, 0x0000, 0x0000, 0x0000, 0x0000, 0x0000, 0x0000, 0x0000,
|
|
0x0000, 0x0000, 0x0000, 0x0000, 0x0000, 0x0000, 0x0000, 0x0000,
|
|
0x0000, 0x0000, 0x0000, 0x0000, 0x0000, 0x0000, 0x0000, 0x0000,
|
|
0x0000, 0x0000, 0x0000, 0x0000, 0x0000, 0x0000, 0x0000, 0x0000,
|
|
0x0000, 0x0000, 0x0000, 0x0000, 0x0000, 0x0000, 0x0000, 0x0000,
|
|
0x0000, 0x0000, 0x0000, 0x0000, 0x0000, 0x0000, 0x0000, 0x1C1C,
|
|
0x0000, 0x0000, 0x0000, 0x0000, 0x0000, 0x0000, 0x0000, 0x0000,
|
|
0x0000, 0x0000, 0x0000, 0x0000, 0x0000, 0x0000, 0x0000, 0x0000,
|
|
0x0000, 0x0000, 0x0000, 0x0000, 0x0000, 0x0000, 0x0000, 0x0000,
|
|
0x0000, 0x0000, 0x0000, 0x0000, 0x0000, 0x0000, 0x0000, 0x0000,
|
|
0x0000, 0x0000, 0x0000, 0x0000, 0x0000, 0x0000, 0x0000, 0x0000,
|
|
0x0000, 0x0000, 0x0000, 0x0000, 0x8080, 0x0000, 0x8080, 0x8080,
|
|
0xC0C0, 0xC0C0, 0xC0C0, 0xC0C0, 0xC0C0, 0xC0C0, 0xC0C0, 0xE0E0,
|
|
0xF0F0, 0xF0F0, 0xF0F0, 0xF0F0, 0xF8F8, 0xF8F8, 0xFCFC, 0xFEFE
|
|
};
|
|
|
|
const uint16 DigitalRenderer::TriRectTable[0x100] = {
|
|
0x0000, 0x0000, 0x0000, 0x0000, 0x0000, 0x0000, 0x0000, 0x0000,
|
|
0x0000, 0x0000, 0x0000, 0x0000, 0x0000, 0x0000, 0x0000, 0x0000,
|
|
0x0000, 0x0000, 0x0000, 0x0000, 0x0000, 0x0000, 0x0000, 0x0000,
|
|
0x0000, 0x0000, 0x0000, 0x0000, 0x0000, 0x0000, 0x0000, 0x0000,
|
|
0x0000, 0x0000, 0x0000, 0x0000, 0x0000, 0x0000, 0x0000, 0x0000,
|
|
0x0000, 0x0000, 0x0000, 0x0000, 0x0000, 0x0000, 0x0000, 0x0000,
|
|
0x0000, 0x0000, 0x0000, 0x0000, 0x0000, 0x0000, 0x0000, 0x0000,
|
|
0x0000, 0x0000, 0x0000, 0x0000, 0x0000, 0x0000, 0x0000, 0x0000,
|
|
0x0000, 0x0000, 0x0000, 0x0000, 0x0000, 0x0000, 0x0000, 0x0000,
|
|
0x0000, 0x0000, 0x0000, 0x0000, 0x0000, 0x0000, 0x0000, 0x0000,
|
|
0x0000, 0x0000, 0x0000, 0x0000, 0x0000, 0x0000, 0x0000, 0x0000,
|
|
0x0000, 0x0000, 0x0000, 0x0000, 0x0000, 0x0000, 0x0000, 0x0000,
|
|
0x0000, 0x0000, 0x0000, 0x0000, 0x0000, 0x0000, 0x0000, 0x0000,
|
|
0x0000, 0x0000, 0x0000, 0x0000, 0x0000, 0x0000, 0x0000, 0x0000,
|
|
0x0000, 0x0000, 0x0000, 0x0000, 0x0000, 0x0000, 0x0000, 0x0000,
|
|
0x0000, 0x0000, 0x0000, 0x0000, 0x0000, 0x0000, 0x0000, 0x0000,
|
|
0xFFFF, 0xFCFC, 0xF8F8, 0xF0F0, 0xF4F4, 0xF0F0, 0xF0F0, 0xE0E0,
|
|
0xECEC, 0xE0E0, 0xE0E0, 0xC0C0, 0xE0E0, 0xC0C0, 0xC0C0, 0xC0C0,
|
|
0xDCDC, 0xC0C0, 0xC0C0, 0xC0C0, 0xC0C0, 0xC0C0, 0x8080, 0x8080,
|
|
0xC0C0, 0x8080, 0x8080, 0x8080, 0x8080, 0x8080, 0x0000, 0x0000,
|
|
0xBEBE, 0xA0A0, 0x8080, 0x8080, 0x8080, 0x8080, 0x8080, 0x0000,
|
|
0x8080, 0x8080, 0x0000, 0x0000, 0x0000, 0x0000, 0x0000, 0x0000,
|
|
0x8080, 0x0000, 0x0000, 0x0000, 0x0000, 0x0000, 0x0000, 0x0000,
|
|
0x0000, 0x0000, 0x0000, 0x0000, 0x0000, 0x0000, 0x0000, 0x0000,
|
|
0x7E7E, 0x7070, 0x6060, 0x0000, 0x4040, 0x0000, 0x0000, 0x0000,
|
|
0x0000, 0x0000, 0x0000, 0x0000, 0x0000, 0x0000, 0x0000, 0x0000,
|
|
0x0000, 0x0000, 0x0000, 0x0000, 0x0000, 0x0000, 0x0000, 0x0000,
|
|
0x0000, 0x0000, 0x0000, 0x0000, 0x0000, 0x0000, 0x0000, 0x0000,
|
|
0x0000, 0x0000, 0x0000, 0x0000, 0x0000, 0x0000, 0x0000, 0x0000,
|
|
0x0000, 0x0000, 0x0000, 0x0000, 0x0000, 0x0000, 0x0000, 0x0000,
|
|
0x0000, 0x0000, 0x0000, 0x0000, 0x0000, 0x0000, 0x0000, 0x0000,
|
|
0x0000, 0x0000, 0x0000, 0x0000, 0x0000, 0x0000, 0x0000, 0x0000
|
|
};
|
|
|
|
const uint16 DigitalRenderer::SawRectTable[0x100] = {
|
|
0x0000, 0x0000, 0x0000, 0x0000, 0x0000, 0x0000, 0x0000, 0x0000,
|
|
0x0000, 0x0000, 0x0000, 0x0000, 0x0000, 0x0000, 0x0000, 0x0000,
|
|
0x0000, 0x0000, 0x0000, 0x0000, 0x0000, 0x0000, 0x0000, 0x0000,
|
|
0x0000, 0x0000, 0x0000, 0x0000, 0x0000, 0x0000, 0x0000, 0x0000,
|
|
0x0000, 0x0000, 0x0000, 0x0000, 0x0000, 0x0000, 0x0000, 0x0000,
|
|
0x0000, 0x0000, 0x0000, 0x0000, 0x0000, 0x0000, 0x0000, 0x0000,
|
|
0x0000, 0x0000, 0x0000, 0x0000, 0x0000, 0x0000, 0x0000, 0x0000,
|
|
0x0000, 0x0000, 0x0000, 0x0000, 0x0000, 0x0000, 0x0000, 0x0000,
|
|
0x0000, 0x0000, 0x0000, 0x0000, 0x0000, 0x0000, 0x0000, 0x0000,
|
|
0x0000, 0x0000, 0x0000, 0x0000, 0x0000, 0x0000, 0x0000, 0x0000,
|
|
0x0000, 0x0000, 0x0000, 0x0000, 0x0000, 0x0000, 0x0000, 0x0000,
|
|
0x0000, 0x0000, 0x0000, 0x0000, 0x0000, 0x0000, 0x0000, 0x0000,
|
|
0x0000, 0x0000, 0x0000, 0x0000, 0x0000, 0x0000, 0x0000, 0x0000,
|
|
0x0000, 0x0000, 0x0000, 0x0000, 0x0000, 0x0000, 0x0000, 0x0000,
|
|
0x0000, 0x0000, 0x0000, 0x0000, 0x0000, 0x0000, 0x0000, 0x0000,
|
|
0x0000, 0x0000, 0x0000, 0x0000, 0x0000, 0x0000, 0x0000, 0x0000,
|
|
0x0000, 0x0000, 0x0000, 0x0000, 0x0000, 0x0000, 0x0000, 0x0000,
|
|
0x0000, 0x0000, 0x0000, 0x0000, 0x0000, 0x0000, 0x0000, 0x0000,
|
|
0x0000, 0x0000, 0x0000, 0x0000, 0x0000, 0x0000, 0x0000, 0x0000,
|
|
0x0000, 0x0000, 0x0000, 0x0000, 0x0000, 0x0000, 0x0000, 0x0000,
|
|
0x0000, 0x0000, 0x0000, 0x0000, 0x0000, 0x0000, 0x0000, 0x0000,
|
|
0x0000, 0x0000, 0x0000, 0x0000, 0x0000, 0x0000, 0x0000, 0x8080,
|
|
0x0000, 0x0000, 0x0000, 0x0000, 0x0000, 0x0000, 0x8080, 0x8080,
|
|
0x0000, 0x8080, 0x8080, 0x8080, 0x8080, 0x8080, 0xB0B0, 0xBEBE,
|
|
0x0000, 0x0000, 0x0000, 0x0000, 0x0000, 0x0000, 0x0000, 0x8080,
|
|
0x0000, 0x0000, 0x0000, 0x8080, 0x8080, 0x8080, 0x8080, 0xC0C0,
|
|
0x0000, 0x8080, 0x8080, 0x8080, 0x8080, 0x8080, 0x8080, 0xC0C0,
|
|
0x8080, 0x8080, 0xC0C0, 0xC0C0, 0xC0C0, 0xC0C0, 0xC0C0, 0xDCDC,
|
|
0x8080, 0x8080, 0x8080, 0xC0C0, 0xC0C0, 0xC0C0, 0xC0C0, 0xC0C0,
|
|
0xC0C0, 0xC0C0, 0xC0C0, 0xE0E0, 0xE0E0, 0xE0E0, 0xE0E0, 0xECEC,
|
|
0xC0C0, 0xE0E0, 0xE0E0, 0xE0E0, 0xE0E0, 0xF0F0, 0xF0F0, 0xF4F4,
|
|
0xF0F0, 0xF0F0, 0xF8F8, 0xF8F8, 0xF8F8, 0xFCFC, 0xFEFE, 0xFFFF
|
|
};
|
|
|
|
const uint16 DigitalRenderer::TriSawRectTable[0x100] = {
|
|
0x0000, 0x0000, 0x0000, 0x0000, 0x0000, 0x0000, 0x0000, 0x0000,
|
|
0x0000, 0x0000, 0x0000, 0x0000, 0x0000, 0x0000, 0x0000, 0x0000,
|
|
0x0000, 0x0000, 0x0000, 0x0000, 0x0000, 0x0000, 0x0000, 0x0000,
|
|
0x0000, 0x0000, 0x0000, 0x0000, 0x0000, 0x0000, 0x0000, 0x0000,
|
|
0x0000, 0x0000, 0x0000, 0x0000, 0x0000, 0x0000, 0x0000, 0x0000,
|
|
0x0000, 0x0000, 0x0000, 0x0000, 0x0000, 0x0000, 0x0000, 0x0000,
|
|
0x0000, 0x0000, 0x0000, 0x0000, 0x0000, 0x0000, 0x0000, 0x0000,
|
|
0x0000, 0x0000, 0x0000, 0x0000, 0x0000, 0x0000, 0x0000, 0x0000,
|
|
0x0000, 0x0000, 0x0000, 0x0000, 0x0000, 0x0000, 0x0000, 0x0000,
|
|
0x0000, 0x0000, 0x0000, 0x0000, 0x0000, 0x0000, 0x0000, 0x0000,
|
|
0x0000, 0x0000, 0x0000, 0x0000, 0x0000, 0x0000, 0x0000, 0x0000,
|
|
0x0000, 0x0000, 0x0000, 0x0000, 0x0000, 0x0000, 0x0000, 0x0000,
|
|
0x0000, 0x0000, 0x0000, 0x0000, 0x0000, 0x0000, 0x0000, 0x0000,
|
|
0x0000, 0x0000, 0x0000, 0x0000, 0x0000, 0x0000, 0x0000, 0x0000,
|
|
0x0000, 0x0000, 0x0000, 0x0000, 0x0000, 0x0000, 0x0000, 0x0000,
|
|
0x0000, 0x0000, 0x0000, 0x0000, 0x0000, 0x0000, 0x0000, 0x0000,
|
|
0x0000, 0x0000, 0x0000, 0x0000, 0x0000, 0x0000, 0x0000, 0x0000,
|
|
0x0000, 0x0000, 0x0000, 0x0000, 0x0000, 0x0000, 0x0000, 0x0000,
|
|
0x0000, 0x0000, 0x0000, 0x0000, 0x0000, 0x0000, 0x0000, 0x0000,
|
|
0x0000, 0x0000, 0x0000, 0x0000, 0x0000, 0x0000, 0x0000, 0x0000,
|
|
0x0000, 0x0000, 0x0000, 0x0000, 0x0000, 0x0000, 0x0000, 0x0000,
|
|
0x0000, 0x0000, 0x0000, 0x0000, 0x0000, 0x0000, 0x0000, 0x0000,
|
|
0x0000, 0x0000, 0x0000, 0x0000, 0x0000, 0x0000, 0x0000, 0x0000,
|
|
0x0000, 0x0000, 0x0000, 0x0000, 0x0000, 0x0000, 0x0000, 0x0000,
|
|
0x0000, 0x0000, 0x0000, 0x0000, 0x0000, 0x0000, 0x0000, 0x0000,
|
|
0x0000, 0x0000, 0x0000, 0x0000, 0x0000, 0x0000, 0x0000, 0x0000,
|
|
0x0000, 0x0000, 0x0000, 0x0000, 0x0000, 0x0000, 0x0000, 0x0000,
|
|
0x0000, 0x0000, 0x0000, 0x0000, 0x0000, 0x0000, 0x0000, 0x0000,
|
|
0x0000, 0x0000, 0x0000, 0x0000, 0x0000, 0x0000, 0x0000, 0x0000,
|
|
0x0000, 0x0000, 0x0000, 0x0000, 0x0000, 0x0000, 0x8080, 0x8080,
|
|
0x8080, 0x8080, 0x8080, 0x8080, 0x8080, 0x8080, 0xC0C0, 0xC0C0,
|
|
0xC0C0, 0xC0C0, 0xE0E0, 0xE0E0, 0xE0E0, 0xF0F0, 0xF8F8, 0xFCFC
|
|
};
|
|
#endif
|
|
|
|
const uint32 DigitalRenderer::EGTable[16] = {
|
|
(SID_CYCLES << 16) / 9, (SID_CYCLES << 16) / 32,
|
|
(SID_CYCLES << 16) / 63, (SID_CYCLES << 16) / 95,
|
|
(SID_CYCLES << 16) / 149, (SID_CYCLES << 16) / 220,
|
|
(SID_CYCLES << 16) / 267, (SID_CYCLES << 16) / 313,
|
|
(SID_CYCLES << 16) / 392, (SID_CYCLES << 16) / 977,
|
|
(SID_CYCLES << 16) / 1954, (SID_CYCLES << 16) / 3126,
|
|
(SID_CYCLES << 16) / 3906, (SID_CYCLES << 16) / 11720,
|
|
(SID_CYCLES << 16) / 19531, (SID_CYCLES << 16) / 31251
|
|
};
|
|
|
|
const uint8 DigitalRenderer::EGDRShift[256] = {
|
|
5,5,5,5,5,5,5,5,4,4,4,4,4,4,4,4,
|
|
3,3,3,3,3,3,3,3,3,3,3,3,2,2,2,2,
|
|
2,2,2,2,2,2,2,2,2,2,2,2,2,2,2,2,
|
|
2,2,2,2,2,2,2,2,1,1,1,1,1,1,1,1,
|
|
1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,
|
|
1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,
|
|
0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,
|
|
0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,
|
|
0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,
|
|
0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,
|
|
0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,
|
|
0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,
|
|
0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,
|
|
0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,
|
|
0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,
|
|
0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0
|
|
};
|
|
|
|
const int16 DigitalRenderer::SampleTab[16] = {
|
|
0x8000, 0x9111, 0xa222, 0xb333, 0xc444, 0xd555, 0xe666, 0xf777,
|
|
0x0888, 0x1999, 0x2aaa, 0x3bbb, 0x4ccc, 0x5ddd, 0x6eee, 0x7fff,
|
|
};
|
|
|
|
|
|
/*
|
|
* Constructor
|
|
*/
|
|
|
|
#if defined(__BEOS__) || defined(__riscos__)
|
|
DigitalRenderer::DigitalRenderer(C64 *c64) : the_c64(c64)
|
|
#else
|
|
DigitalRenderer::DigitalRenderer()
|
|
#endif
|
|
{
|
|
// Link voices together
|
|
voice[0].mod_by = &voice[2];
|
|
voice[1].mod_by = &voice[0];
|
|
voice[2].mod_by = &voice[1];
|
|
voice[0].mod_to = &voice[1];
|
|
voice[1].mod_to = &voice[2];
|
|
voice[2].mod_to = &voice[0];
|
|
|
|
// Calculate triangle table
|
|
for (int i=0; i<0x1000; i++) {
|
|
TriTable[i] = (i << 4) | (i >> 8);
|
|
TriTable[0x1fff-i] = (i << 4) | (i >> 8);
|
|
}
|
|
|
|
#ifdef PRECOMPUTE_RESONANCE
|
|
#ifdef USE_FIXPOINT_MATHS
|
|
// slow floating point doesn't matter much on startup!
|
|
for (int i=0; i<256; i++) {
|
|
resonanceLP[i] = FixNo(CALC_RESONANCE_LP(i));
|
|
resonanceHP[i] = FixNo(CALC_RESONANCE_HP(i));
|
|
}
|
|
// Pre-compute the quotient. No problem since int-part is small enough
|
|
sidquot = (int32)((((double)SID_FREQ)*65536) / SAMPLE_FREQ);
|
|
// compute lookup table for sin and cos
|
|
InitFixSinTab();
|
|
#else
|
|
for (int i=0; i<256; i++) {
|
|
resonanceLP[i] = CALC_RESONANCE_LP(i);
|
|
resonanceHP[i] = CALC_RESONANCE_HP(i);
|
|
}
|
|
#endif
|
|
#endif
|
|
|
|
Reset();
|
|
|
|
// System specific initialization
|
|
init_sound();
|
|
}
|
|
|
|
|
|
/*
|
|
* Reset emulation
|
|
*/
|
|
|
|
void DigitalRenderer::Reset(void)
|
|
{
|
|
volume = 0;
|
|
|
|
for (int v=0; v<3; v++) {
|
|
voice[v].wave = WAVE_NONE;
|
|
voice[v].eg_state = EG_IDLE;
|
|
voice[v].count = voice[v].add = 0;
|
|
voice[v].freq = voice[v].pw = 0;
|
|
voice[v].eg_level = voice[v].s_level = 0;
|
|
voice[v].a_add = voice[v].d_sub = voice[v].r_sub = EGTable[0];
|
|
voice[v].gate = voice[v].ring = voice[v].test = false;
|
|
voice[v].filter = voice[v].sync = voice[v].mute = false;
|
|
}
|
|
|
|
f_type = FILT_NONE;
|
|
f_freq = f_res = 0;
|
|
#ifdef USE_FIXPOINT_MATHS
|
|
f_ampl = FixNo(1);
|
|
d1 = d2 = g1 = g2 = 0;
|
|
xn1 = xn2 = yn1 = yn2 = 0;
|
|
#else
|
|
f_ampl = 1.0;
|
|
d1 = d2 = g1 = g2 = 0.0;
|
|
xn1 = xn2 = yn1 = yn2 = 0.0;
|
|
#endif
|
|
|
|
sample_in_ptr = 0;
|
|
memset(sample_buf, 0, SAMPLE_BUF_SIZE);
|
|
}
|
|
|
|
|
|
/*
|
|
* Write to register
|
|
*/
|
|
|
|
#include "C64.h"
|
|
extern C64 *TheC64;
|
|
/*
|
|
* Fill buffer (for Unix sound routines), sample volume (for sampled voice)
|
|
*/
|
|
|
|
void MOS6581::EmulateLine(void)
|
|
{
|
|
if (the_renderer != NULL)
|
|
the_renderer->EmulateLine();
|
|
/* Flush network sound every ~100ms */
|
|
if (TheC64->network_connection_type == CLIENT)
|
|
{
|
|
static NetworkUpdateSoundInfo *cur = NULL;
|
|
|
|
if (!cur) {
|
|
cur = TheC64->network->DequeueSound();
|
|
}
|
|
|
|
while (cur) {
|
|
if (cur->delay_cycles > 0)
|
|
cur->delay_cycles--;
|
|
if (cur->delay_cycles != 0)
|
|
break;
|
|
/* Delayed long enough - write to the SID! */
|
|
this->WriteRegister(cur->adr, cur->val);
|
|
cur = TheC64->network->DequeueSound();
|
|
}
|
|
}
|
|
if (TheC64->network_connection_type == MASTER ||
|
|
TheC64->network_connection_type == CLIENT)
|
|
TheC64->linecnt++;
|
|
}
|
|
|
|
void DigitalRenderer::WriteRegister(uint16 adr, uint8 byte)
|
|
{
|
|
if (!ready)
|
|
return;
|
|
|
|
if (TheC64) {
|
|
if (TheC64->network_connection_type == MASTER)
|
|
TheC64->network->RegisterSidWrite(TheC64->linecnt, adr, byte);
|
|
}
|
|
|
|
int v = adr/7; // Voice number
|
|
|
|
switch (adr) {
|
|
case 0:
|
|
case 7:
|
|
case 14:
|
|
voice[v].freq = (voice[v].freq & 0xff00) | byte;
|
|
#ifdef USE_FIXPOINT_MATHS
|
|
voice[v].add = sidquot.imul((int)voice[v].freq);
|
|
#else
|
|
voice[v].add = (uint32)((float)voice[v].freq * SID_FREQ / SAMPLE_FREQ);
|
|
#endif
|
|
break;
|
|
|
|
case 1:
|
|
case 8:
|
|
case 15:
|
|
voice[v].freq = (voice[v].freq & 0xff) | (byte << 8);
|
|
#ifdef USE_FIXPOINT_MATHS
|
|
voice[v].add = sidquot.imul((int)voice[v].freq);
|
|
#else
|
|
voice[v].add = (uint32)((float)voice[v].freq * SID_FREQ / SAMPLE_FREQ);
|
|
#endif
|
|
break;
|
|
|
|
case 2:
|
|
case 9:
|
|
case 16:
|
|
voice[v].pw = (voice[v].pw & 0x0f00) | byte;
|
|
break;
|
|
|
|
case 3:
|
|
case 10:
|
|
case 17:
|
|
voice[v].pw = (voice[v].pw & 0xff) | ((byte & 0xf) << 8);
|
|
break;
|
|
|
|
case 4:
|
|
case 11:
|
|
case 18:
|
|
voice[v].wave = (byte >> 4) & 0xf;
|
|
if ((byte & 1) != voice[v].gate)
|
|
{
|
|
if (byte & 1) // Gate turned on
|
|
voice[v].eg_state = EG_ATTACK;
|
|
else // Gate turned off
|
|
{
|
|
if (voice[v].eg_state != EG_IDLE)
|
|
voice[v].eg_state = EG_RELEASE;
|
|
}
|
|
}
|
|
voice[v].gate = byte & 1;
|
|
voice[v].mod_by->sync = byte & 2;
|
|
voice[v].ring = byte & 4;
|
|
if ((voice[v].test = byte & 8) != 0)
|
|
voice[v].count = 0;
|
|
break;
|
|
|
|
case 5:
|
|
case 12:
|
|
case 19:
|
|
voice[v].a_add = EGTable[byte >> 4];
|
|
voice[v].d_sub = EGTable[byte & 0xf];
|
|
break;
|
|
|
|
case 6:
|
|
case 13:
|
|
case 20:
|
|
voice[v].s_level = (byte >> 4) * 0x111111;
|
|
voice[v].r_sub = EGTable[byte & 0xf];
|
|
break;
|
|
|
|
case 22:
|
|
if (byte != f_freq) {
|
|
f_freq = byte;
|
|
if (ThePrefs.SIDFilters)
|
|
calc_filter();
|
|
}
|
|
break;
|
|
|
|
case 23:
|
|
voice[0].filter = byte & 1;
|
|
voice[1].filter = byte & 2;
|
|
voice[2].filter = byte & 4;
|
|
if ((byte >> 4) != f_res) {
|
|
f_res = byte >> 4;
|
|
if (ThePrefs.SIDFilters)
|
|
calc_filter();
|
|
}
|
|
break;
|
|
|
|
case 24:
|
|
volume = byte & 0xf;
|
|
voice[2].mute = byte & 0x80;
|
|
if (((byte >> 4) & 7) != f_type) {
|
|
f_type = (byte >> 4) & 7;
|
|
#ifdef USE_FIXPOINT_MATHS
|
|
xn1 = xn2 = yn1 = yn2 = 0;
|
|
#else
|
|
xn1 = xn2 = yn1 = yn2 = 0.0;
|
|
#endif
|
|
if (ThePrefs.SIDFilters)
|
|
calc_filter();
|
|
}
|
|
break;
|
|
}
|
|
}
|
|
|
|
|
|
/*
|
|
* Preferences may have changed
|
|
*/
|
|
|
|
void DigitalRenderer::NewPrefs(Prefs *prefs)
|
|
{
|
|
calc_filter();
|
|
}
|
|
|
|
|
|
/*
|
|
* Calculate IIR filter coefficients
|
|
*/
|
|
|
|
void DigitalRenderer::calc_filter(void)
|
|
{
|
|
#ifdef USE_FIXPOINT_MATHS
|
|
FixPoint fr, arg;
|
|
|
|
if (f_type == FILT_ALL)
|
|
{
|
|
d1 = 0; d2 = 0; g1 = 0; g2 = 0; f_ampl = FixNo(1); return;
|
|
}
|
|
else if (f_type == FILT_NONE)
|
|
{
|
|
d1 = 0; d2 = 0; g1 = 0; g2 = 0; f_ampl = 0; return;
|
|
}
|
|
#else
|
|
float fr, arg;
|
|
|
|
// Check for some trivial cases
|
|
if (f_type == FILT_ALL) {
|
|
d1 = 0.0; d2 = 0.0;
|
|
g1 = 0.0; g2 = 0.0;
|
|
f_ampl = 1.0;
|
|
return;
|
|
} else if (f_type == FILT_NONE) {
|
|
d1 = 0.0; d2 = 0.0;
|
|
g1 = 0.0; g2 = 0.0;
|
|
f_ampl = 0.0;
|
|
return;
|
|
}
|
|
#endif
|
|
|
|
// Calculate resonance frequency
|
|
if (f_type == FILT_LP || f_type == FILT_LPBP)
|
|
#ifdef PRECOMPUTE_RESONANCE
|
|
fr = resonanceLP[f_freq];
|
|
#else
|
|
fr = CALC_RESONANCE_LP(f_freq);
|
|
#endif
|
|
else
|
|
#ifdef PRECOMPUTE_RESONANCE
|
|
fr = resonanceHP[f_freq];
|
|
#else
|
|
fr = CALC_RESONANCE_HP(f_freq);
|
|
#endif
|
|
|
|
#ifdef USE_FIXPOINT_MATHS
|
|
// explanations see below.
|
|
arg = fr / (SAMPLE_FREQ >> 1);
|
|
if (arg > FixNo(0.99)) {arg = FixNo(0.99);}
|
|
if (arg < FixNo(0.01)) {arg = FixNo(0.01);}
|
|
|
|
g2 = FixNo(0.55) + FixNo(1.2) * arg * (arg - 1) + FixNo(0.0133333333) * f_res;
|
|
g1 = FixNo(-2) * g2.sqrt() * fixcos(arg);
|
|
|
|
if (f_type == FILT_LPBP || f_type == FILT_HPBP) {g2 += FixNo(0.1);}
|
|
|
|
if (g1.abs() >= g2 + 1)
|
|
{
|
|
if (g1 > 0) {g1 = g2 + FixNo(0.99);}
|
|
else {g1 = -(g2 + FixNo(0.99));}
|
|
}
|
|
|
|
switch (f_type)
|
|
{
|
|
case FILT_LPBP:
|
|
case FILT_LP:
|
|
d1 = FixNo(2); d2 = FixNo(1); f_ampl = FixNo(0.25) * (1 + g1 + g2); break;
|
|
case FILT_HPBP:
|
|
case FILT_HP:
|
|
d1 = FixNo(-2); d2 = FixNo(1); f_ampl = FixNo(0.25) * (1 - g1 + g2); break;
|
|
case FILT_BP:
|
|
d1 = 0; d2 = FixNo(-1);
|
|
f_ampl = FixNo(0.25) * (1 + g1 + g2) * (1 + fixcos(arg)) / fixsin(arg);
|
|
break;
|
|
case FILT_NOTCH:
|
|
d1 = FixNo(-2) * fixcos(arg); d2 = FixNo(1);
|
|
f_ampl = FixNo(0.25) * (1 + g1 + g2) * (1 + fixcos(arg)) / fixsin(arg);
|
|
break;
|
|
default: break;
|
|
}
|
|
|
|
#else
|
|
|
|
// Limit to <1/2 sample frequency, avoid div by 0 in case FILT_BP below
|
|
arg = fr / (float)(SAMPLE_FREQ >> 1);
|
|
if (arg > 0.99)
|
|
arg = 0.99;
|
|
if (arg < 0.01)
|
|
arg = 0.01;
|
|
|
|
// Calculate poles (resonance frequency and resonance)
|
|
g2 = 0.55 + 1.2 * arg * arg - 1.2 * arg + (float)f_res * 0.0133333333;
|
|
g1 = -2.0 * sqrt(g2) * cos(M_PI * arg);
|
|
|
|
// Increase resonance if LP/HP combined with BP
|
|
if (f_type == FILT_LPBP || f_type == FILT_HPBP)
|
|
g2 += 0.1;
|
|
|
|
// Stabilize filter
|
|
if (fabs(g1) >= g2 + 1.0)
|
|
{
|
|
if (g1 > 0.0)
|
|
g1 = g2 + 0.99;
|
|
else
|
|
g1 = -(g2 + 0.99);
|
|
}
|
|
|
|
// Calculate roots (filter characteristic) and input attenuation
|
|
switch (f_type) {
|
|
|
|
case FILT_LPBP:
|
|
case FILT_LP:
|
|
d1 = 2.0; d2 = 1.0;
|
|
f_ampl = 0.25 * (1.0 + g1 + g2);
|
|
break;
|
|
|
|
case FILT_HPBP:
|
|
case FILT_HP:
|
|
d1 = -2.0; d2 = 1.0;
|
|
f_ampl = 0.25 * (1.0 - g1 + g2);
|
|
break;
|
|
|
|
case FILT_BP:
|
|
d1 = 0.0; d2 = -1.0;
|
|
f_ampl = 0.25 * (1.0 + g1 + g2) * (1 + cos(M_PI * arg)) / sin(M_PI * arg);
|
|
break;
|
|
|
|
case FILT_NOTCH:
|
|
d1 = -2.0 * cos(M_PI * arg); d2 = 1.0;
|
|
f_ampl = 0.25 * (1.0 + g1 + g2) * (1 + cos(M_PI * arg)) / (sin(M_PI * arg));
|
|
break;
|
|
|
|
default:
|
|
break;
|
|
}
|
|
#endif
|
|
}
|
|
|
|
|
|
/*
|
|
* Fill one audio buffer with calculated SID sound
|
|
*/
|
|
|
|
void DigitalRenderer::calc_buffer(int16 *buf, long count)
|
|
{
|
|
// Get filter coefficients, so the emulator won't change
|
|
// them in the middle of our calculations
|
|
#ifdef USE_FIXPOINT_MATHS
|
|
FixPoint cf_ampl = f_ampl;
|
|
FixPoint cd1 = d1, cd2 = d2, cg1 = g1, cg2 = g2;
|
|
#else
|
|
float cf_ampl = f_ampl;
|
|
float cd1 = d1, cd2 = d2, cg1 = g1, cg2 = g2;
|
|
#endif
|
|
|
|
// Index in sample_buf for reading, 16.16 fixed
|
|
uint32 sample_count = (sample_in_ptr + SAMPLE_BUF_SIZE/2) << 16;
|
|
|
|
count >>= 1; // 16 bit mono output, count is in bytes
|
|
while (count--) {
|
|
// Get current master volume from sample buffer,
|
|
// calculate sampled voice
|
|
uint8 master_volume = sample_buf[(sample_count >> 16) % SAMPLE_BUF_SIZE];
|
|
sample_count += ((0x138 * 50) << 16) / SAMPLE_FREQ;
|
|
int32 sum_output = SampleTab[master_volume] << 8;
|
|
int32 sum_output_filter = 0;
|
|
|
|
// Loop for all three voices
|
|
for (int j=0; j<3; j++) {
|
|
DRVoice *v = &voice[j];
|
|
|
|
// Envelope generators
|
|
uint16 envelope;
|
|
|
|
switch (v->eg_state) {
|
|
case EG_ATTACK:
|
|
v->eg_level += v->a_add;
|
|
if (v->eg_level > 0xffffff) {
|
|
v->eg_level = 0xffffff;
|
|
v->eg_state = EG_DECAY;
|
|
}
|
|
break;
|
|
case EG_DECAY:
|
|
if (v->eg_level <= v->s_level || v->eg_level > 0xffffff)
|
|
v->eg_level = v->s_level;
|
|
else {
|
|
v->eg_level -= v->d_sub >> EGDRShift[v->eg_level >> 16];
|
|
if (v->eg_level <= v->s_level || v->eg_level > 0xffffff)
|
|
v->eg_level = v->s_level;
|
|
}
|
|
break;
|
|
case EG_RELEASE:
|
|
v->eg_level -= v->r_sub >> EGDRShift[v->eg_level >> 16];
|
|
if (v->eg_level > 0xffffff) {
|
|
v->eg_level = 0;
|
|
v->eg_state = EG_IDLE;
|
|
}
|
|
break;
|
|
case EG_IDLE:
|
|
v->eg_level = 0;
|
|
break;
|
|
}
|
|
envelope = (v->eg_level * master_volume) >> 20;
|
|
|
|
// Waveform generator
|
|
if (v->mute)
|
|
continue;
|
|
uint16 output;
|
|
|
|
if (!v->test)
|
|
v->count += v->add;
|
|
|
|
if (v->sync && (v->count > 0x1000000))
|
|
v->mod_to->count = 0;
|
|
|
|
v->count &= 0xffffff;
|
|
|
|
switch (v->wave) {
|
|
case WAVE_TRI:
|
|
if (v->ring)
|
|
output = TriTable[(v->count ^ (v->mod_by->count & 0x800000)) >> 11];
|
|
else
|
|
output = TriTable[v->count >> 11];
|
|
break;
|
|
case WAVE_SAW:
|
|
output = v->count >> 8;
|
|
break;
|
|
case WAVE_RECT:
|
|
if (v->count > (uint32)(v->pw << 12))
|
|
output = 0xffff;
|
|
else
|
|
output = 0;
|
|
break;
|
|
case WAVE_TRISAW:
|
|
output = TriSawTable[v->count >> 16];
|
|
break;
|
|
case WAVE_TRIRECT:
|
|
if (v->count > (uint32)(v->pw << 12))
|
|
output = TriRectTable[v->count >> 16];
|
|
else
|
|
output = 0;
|
|
break;
|
|
case WAVE_SAWRECT:
|
|
if (v->count > (uint32)(v->pw << 12))
|
|
output = SawRectTable[v->count >> 16];
|
|
else
|
|
output = 0;
|
|
break;
|
|
case WAVE_TRISAWRECT:
|
|
if (v->count > (uint32)(v->pw << 12))
|
|
output = TriSawRectTable[v->count >> 16];
|
|
else
|
|
output = 0;
|
|
break;
|
|
case WAVE_NOISE:
|
|
if (v->count > 0x100000) {
|
|
output = v->noise = sid_random() << 8;
|
|
v->count &= 0xfffff;
|
|
} else
|
|
output = v->noise;
|
|
break;
|
|
default:
|
|
output = 0x8000;
|
|
break;
|
|
}
|
|
if (v->filter)
|
|
sum_output_filter += (int16)(output ^ 0x8000) * envelope;
|
|
else
|
|
sum_output += (int16)(output ^ 0x8000) * envelope;
|
|
}
|
|
|
|
// Filter
|
|
if (ThePrefs.SIDFilters) {
|
|
#ifdef USE_FIXPOINT_MATHS
|
|
int32 xn = cf_ampl.imul(sum_output_filter);
|
|
int32 yn = xn+cd1.imul(xn1)+cd2.imul(xn2)-cg1.imul(yn1)-cg2.imul(yn2);
|
|
yn2 = yn1; yn1 = yn; xn2 = xn1; xn1 = xn;
|
|
sum_output_filter = yn;
|
|
#else
|
|
float xn = (float)sum_output_filter * cf_ampl;
|
|
float yn = xn + cd1 * xn1 + cd2 * xn2 - cg1 * yn1 - cg2 * yn2;
|
|
yn2 = yn1; yn1 = yn; xn2 = xn1; xn1 = xn;
|
|
sum_output_filter = (int32)yn;
|
|
#endif
|
|
}
|
|
|
|
// Write to buffer
|
|
#if defined(__riscos__) // lookup in 8k (13bit) translation table
|
|
*buf++ = LinToLog[((sum_output + sum_output_filter) >> 13) & 0x1fff];
|
|
#else
|
|
*buf++ = (sum_output + sum_output_filter) >> 10;
|
|
#endif
|
|
}
|
|
}
|
|
|
|
|
|
// Manufacturer independent sound is still just a dream...
|
|
#if defined(GEKKO)
|
|
#include "SID_wii.h"
|
|
#else
|
|
#include "SID_SDL.h"
|
|
#endif
|
|
|
|
|
|
/*
|
|
* Open/close the renderer, according to old and new prefs
|
|
*/
|
|
|
|
void MOS6581::open_close_renderer(int old_type, int new_type)
|
|
{
|
|
if (old_type == new_type)
|
|
return;
|
|
|
|
// Delete the old renderer
|
|
delete the_renderer;
|
|
|
|
// Create new renderer
|
|
if (new_type == SIDTYPE_DIGITAL)
|
|
the_renderer = new DigitalRenderer;
|
|
else
|
|
the_renderer = NULL;
|
|
|
|
// Stuff the current register values into the new renderer
|
|
if (the_renderer != NULL)
|
|
for (int i=0; i<25; i++)
|
|
the_renderer->WriteRegister(i, regs[i]);
|
|
}
|