23 #ifndef WAVEFORMGENERATOR_H
24 #define WAVEFORMGENERATOR_H
26 #include "siddefs-fp.h"
96 unsigned int shift_register;
101 unsigned int ring_msb_mask;
102 unsigned int no_noise;
103 unsigned int noise_output;
104 unsigned int no_noise_or_noise_output;
105 unsigned int no_pulse;
106 unsigned int pulse_output;
109 unsigned int waveform;
111 int floating_output_ttl;
113 unsigned int waveform_output;
116 unsigned int accumulator;
122 unsigned int tri_saw_pipeline;
126 int shift_register_reset;
129 int model_shift_register_reset;
145 void clock_shift_register(
unsigned int bit0);
147 unsigned int get_noise_writeback();
149 void write_shift_register();
151 void reset_shift_register();
153 void set_noise_output();
156 void setWaveformModels(
matrix_t* models);
194 no_noise_or_noise_output(no_noise | noise_output),
198 floating_output_ttl(0),
200 accumulator(0x555555),
202 tri_saw_pipeline(0x555),
204 shift_register_reset(0),
215 void writeFREQ_LO(
unsigned char freq_lo) { freq = (freq & 0xff00) | (freq_lo & 0xff); }
222 void writeFREQ_HI(
unsigned char freq_hi) { freq = (freq_hi << 8 & 0xff00) | (freq & 0xff); }
229 void writePW_LO(
unsigned char pw_lo) { pw = (pw & 0xf00) | (pw_lo & 0x0ff); }
236 void writePW_HI(
unsigned char pw_hi) { pw = (pw_hi << 8 & 0xf00) | (pw & 0x0ff); }
261 unsigned char readOSC()
const {
return static_cast<unsigned char>(osc3 >> 4); }
286 #if RESID_INLINING || defined(WAVEFORMGENERATOR_CPP)
296 if (unlikely(shift_register_reset != 0) && unlikely(--shift_register_reset == 0))
298 reset_shift_register();
305 pulse_output = 0xfff;
310 const unsigned int accumulator_old = accumulator;
311 accumulator = (accumulator + freq) & 0xffffff;
314 const unsigned int accumulator_bits_set = ~accumulator_old & accumulator;
317 msb_rising = (accumulator_bits_set & 0x800000) != 0;
321 if (unlikely((accumulator_bits_set & 0x080000) != 0))
326 else if (unlikely(shift_pipeline != 0) && --shift_pipeline == 0)
329 clock_shift_register(((shift_register << 22) ^ (shift_register << 17)) & (1 << 22));
334 static unsigned int noise_pulse6581(
unsigned int noise)
336 return (noise < 0xf00) ? 0x000 : noise & (noise << 1) & (noise << 2);
339 static unsigned int noise_pulse8580(
unsigned int noise)
341 return (noise < 0xfc0) ? noise & (noise << 1) : 0xfc0;
348 if (likely(waveform != 0))
350 const unsigned int ix = (accumulator ^ (~ringModulator->accumulator & ring_msb_mask)) >> 12;
354 waveform_output = wave[ix] & (no_pulse | pulse_output) & no_noise_or_noise_output;
357 if (unlikely((waveform & 0xc) == 0xc))
358 waveform_output = is6581 ? noise_pulse6581(waveform_output) : noise_pulse8580(waveform_output);
362 if ((waveform & 3) && !is6581)
364 osc3 = tri_saw_pipeline & (no_pulse | pulse_output) & no_noise_or_noise_output;
365 tri_saw_pipeline = wave[ix];
369 osc3 = waveform_output;
375 if ((waveform & 2) && unlikely(waveform & 0xd) && is6581)
376 accumulator &= (waveform_output << 12) | 0x7fffff;
378 write_shift_register();
383 if (likely(floating_output_ttl != 0) && unlikely(--floating_output_ttl == 0))
401 pulse_output = ((accumulator >> 12) >= pw) ? 0xfff : 0x000;
405 return dac[waveform_output];