409 lines
9.0 KiB
C++
409 lines
9.0 KiB
C++
/* Mednafen - Multi-system Emulator
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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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#include "system.h"
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#include <cstring>
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namespace MDFN_IEN_WSWAN
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{
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#define MK_SAMPLE_CACHE \
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{ \
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int sample; \
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sample = (((ram[((SampleRAMPos << 6) + (sample_pos[ch] >> 1) + (ch << 4)) ] >> ((sample_pos[ch] & 1) ? 4 : 0)) & 0x0F)) - 0x8; \
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sample_cache[ch][0] = sample * ((volume[ch] >> 4) & 0x0F); \
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sample_cache[ch][1] = sample * ((volume[ch] >> 0) & 0x0F); \
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}
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#define MK_SAMPLE_CACHE_NOISE \
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{ \
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int sample; \
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sample = ((nreg & 1) ? 0xF : 0x0) - 0x8; \
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sample_cache[ch][0] = sample * ((volume[ch] >> 4) & 0x0F); \
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sample_cache[ch][1] = sample * ((volume[ch] >> 0) & 0x0F); \
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}
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#define SYNCSAMPLE(wt) \
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{ \
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int32 left = sample_cache[ch][0], right = sample_cache[ch][1]; \
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WaveSynth.offset_inline(wt, left - last_val[ch][0], sbuf[0]); \
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WaveSynth.offset_inline(wt, right - last_val[ch][1], sbuf[1]); \
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last_val[ch][0] = left; \
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last_val[ch][1] = right; \
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}
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#define SYNCSAMPLE_NOISE(wt) \
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{ \
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int32 left = sample_cache[ch][0], right = sample_cache[ch][1]; \
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NoiseSynth.offset_inline(wt, left - last_val[ch][0], sbuf[0]); \
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NoiseSynth.offset_inline(wt, right - last_val[ch][1], sbuf[1]); \
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last_val[ch][0] = left; \
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last_val[ch][1] = right; \
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}
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void Sound::Update()
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{
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int32 run_time;
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const uint8 *ram = sys->memory.wsRAM;
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const uint32 current_ts = sys->cpu.timestamp;
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//printf("%d\n", v30mz_timestamp);
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//printf("%02x %02x\n", control, noise_control);
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run_time = current_ts - last_ts;
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for(unsigned int ch = 0; ch < 4; ch++)
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{
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// Channel is disabled?
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if(!(control & (1 << ch)))
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continue;
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if(ch == 1 && (control & 0x20)) // Direct D/A mode?
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{
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int32 neoval = (volume[ch] - 0x80) * voice_volume;
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VoiceSynth.offset(current_ts, neoval - last_v_val, sbuf[0]);
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VoiceSynth.offset(current_ts, neoval - last_v_val, sbuf[1]);
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last_v_val = neoval;
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}
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else if(ch == 2 && (control & 0x40) && sweep_value) // Sweep
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{
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uint32 tmp_pt = 2048 - period[ch];
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uint32 meow_timestamp = current_ts - run_time;
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uint32 tmp_run_time = run_time;
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while(tmp_run_time)
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{
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int32 sub_run_time = tmp_run_time;
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if(sub_run_time > sweep_8192_divider)
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sub_run_time = sweep_8192_divider;
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sweep_8192_divider -= sub_run_time;
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if(sweep_8192_divider <= 0)
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{
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sweep_8192_divider += 8192;
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sweep_counter--;
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if(sweep_counter <= 0)
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{
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sweep_counter = sweep_step + 1;
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period[ch] = (period[ch] + (int8)sweep_value) & 0x7FF;
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}
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}
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meow_timestamp += sub_run_time;
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if(tmp_pt > 4)
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{
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period_counter[ch] -= sub_run_time;
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while(period_counter[ch] <= 0)
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{
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sample_pos[ch] = (sample_pos[ch] + 1) & 0x1F;
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MK_SAMPLE_CACHE;
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SYNCSAMPLE(meow_timestamp + period_counter[ch]);
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period_counter[ch] += tmp_pt;
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}
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}
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tmp_run_time -= sub_run_time;
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}
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}
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else if(ch == 3 && (noise_control & 0x10)) //(control & 0x80)) // Noise
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{
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uint32 tmp_pt = 2048 - period[ch];
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period_counter[ch] -= run_time;
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while(period_counter[ch] <= 0)
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{
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static const uint8 stab[8] = { 14, 10, 13, 4, 8, 6, 9, 11 };
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nreg = ((nreg << 1) | ((1 ^ (nreg >> 7) ^ (nreg >> stab[noise_control & 0x7])) & 1)) & 0x7FFF;
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if(control & 0x80)
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{
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MK_SAMPLE_CACHE_NOISE;
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SYNCSAMPLE_NOISE(current_ts + period_counter[ch]);
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}
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else if(tmp_pt > 4)
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{
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sample_pos[ch] = (sample_pos[ch] + 1) & 0x1F;
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MK_SAMPLE_CACHE;
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SYNCSAMPLE(current_ts + period_counter[ch]);
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}
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period_counter[ch] += tmp_pt;
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}
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}
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else
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{
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uint32 tmp_pt = 2048 - period[ch];
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if(tmp_pt > 4)
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{
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period_counter[ch] -= run_time;
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while(period_counter[ch] <= 0)
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{
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sample_pos[ch] = (sample_pos[ch] + 1) & 0x1F;
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MK_SAMPLE_CACHE;
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SYNCSAMPLE(current_ts + period_counter[ch]); // - period_counter[ch]);
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period_counter[ch] += tmp_pt;
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}
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}
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}
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}
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{
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int32 tmphv = HyperVoice;
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if(tmphv - last_hv_val)
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{
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WaveSynth.offset_inline(current_ts, tmphv - last_hv_val, sbuf[0]);
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WaveSynth.offset_inline(current_ts, tmphv - last_hv_val, sbuf[1]);
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last_hv_val = tmphv;
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}
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}
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last_ts = current_ts;
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}
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void Sound::Write(uint32 A, uint8 V)
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{
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Update();
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if(A >= 0x80 && A <= 0x87)
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{
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int ch = (A - 0x80) >> 1;
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if(A & 1)
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period[ch] = (period[ch] & 0x00FF) | ((V & 0x07) << 8);
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else
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period[ch] = (period[ch] & 0x0700) | ((V & 0xFF) << 0);
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}
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else if(A >= 0x88 && A <= 0x8B)
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{
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volume[A - 0x88] = V;
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}
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else if(A == 0x8C)
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sweep_value = V;
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else if(A == 0x8D)
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{
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sweep_step = V;
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sweep_counter = sweep_step + 1;
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sweep_8192_divider = 8192;
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}
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else if(A == 0x8E)
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{
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if(V & 0x8)
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nreg = 0;
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noise_control = V & 0x17;
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//printf("NOISECONTROL: %02x\n", V);
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}
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else if(A == 0x90)
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{
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for(int n = 0; n < 4; n++)
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{
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if(!(control & (1 << n)) && (V & (1 << n)))
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{
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period_counter[n] = 0;
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sample_pos[n] = 0x1F;
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}
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}
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control = V;
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//printf("Sound Control: %02x\n", V);
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}
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else if(A == 0x91)
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{
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output_control = V & 0xF;
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//printf("%02x, %02x\n", V, (V >> 1) & 3);
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}
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else if(A == 0x92)
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nreg = (nreg & 0xFF00) | (V << 0);
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else if(A == 0x93)
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nreg = (nreg & 0x00FF) | ((V & 0x7F) << 8);
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else if(A == 0x94)
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{
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voice_volume = V & 0xF;
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//printf("%02x\n", V);
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}
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else switch(A)
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{
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case 0x8F: SampleRAMPos = V; break;
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case 0x95: HyperVoice = V; break; // Pick a port, any port?!
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//default: printf("%04x:%02x\n", A, V); break;
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}
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Update();
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}
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uint8 Sound::Read(uint32 A)
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{
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Update();
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if(A >= 0x80 && A <= 0x87)
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{
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int ch = (A - 0x80) >> 1;
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if(A & 1)
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return period[ch] >> 8;
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else
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return (uint8)period[ch];
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}
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else if(A >= 0x88 && A <= 0x8B)
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return(volume[A - 0x88]);
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else switch(A)
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{
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default: /*printf("SoundRead: %04x\n", A);*/ return(0);
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case 0x8C: return(sweep_value);
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case 0x8D: return(sweep_step);
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case 0x8E: return(noise_control);
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case 0x8F: return(SampleRAMPos);
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case 0x90: return(control);
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case 0x91: return(output_control | 0x80);
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case 0x92: return((nreg >> 0) & 0xFF);
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case 0x93: return((nreg >> 8) & 0xFF);
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case 0x94: return(voice_volume);
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}
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}
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int32 Sound::Flush(int16 *SoundBuf, const int32 MaxSoundFrames)
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{
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int32 FrameCount = 0;
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Update();
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if(SoundBuf)
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{
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for(int y = 0; y < 2; y++)
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{
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sbuf[y]->end_frame(sys->cpu.timestamp);
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FrameCount = sbuf[y]->read_samples(SoundBuf + y, MaxSoundFrames, true);
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}
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}
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last_ts = 0;
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return(FrameCount);
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}
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// Call before wsRAM is updated
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void Sound::CheckRAMWrite(uint32 A)
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{
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if((A >> 6) == SampleRAMPos)
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Update();
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}
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Sound::Sound()
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{
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for(int i = 0; i < 2; i++)
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{
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sbuf[i] = new Blip_Buffer();
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sbuf[i]->set_sample_rate(0 ? 0 : 44100, 60);
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sbuf[i]->clock_rate((long)(3072000));
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sbuf[i]->bass_freq(20);
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}
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double eff_volume = 0.1; //TOOLOUD 1.0 / 4;
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WaveSynth.volume(eff_volume);
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NoiseSynth.volume(eff_volume);
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VoiceSynth.volume(eff_volume);
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SetRate(44100);
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}
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Sound::~Sound()
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{
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for(int i = 0; i < 2; i++)
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{
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if(sbuf[i])
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{
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delete sbuf[i];
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sbuf[i] = nullptr;
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}
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}
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}
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bool Sound::SetRate(uint32 rate)
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{
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for(int i = 0; i < 2; i++)
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sbuf[i]->set_sample_rate(rate?rate:44100, 60);
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return(TRUE);
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}
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void Sound::Reset()
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{
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std::memset(period, 0, sizeof(period));
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std::memset(volume, 0, sizeof(volume));
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voice_volume = 0;
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sweep_step = 0;
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sweep_value = 0;
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noise_control = 0;
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control = 0;
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output_control = 0;
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sweep_8192_divider = 8192;
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sweep_counter = 0;
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SampleRAMPos = 0;
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std::memset(period_counter, 0, sizeof(period_counter));
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std::memset(sample_pos, 0, sizeof(sample_pos));
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nreg = 0;
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std::memset(sample_cache, 0, sizeof(sample_cache));
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std::memset(last_val, 0, sizeof(last_val));
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last_v_val = 0;
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HyperVoice = 0;
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last_hv_val = 0;
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for(int y = 0; y < 2; y++)
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sbuf[y]->clear();
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}
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SYNCFUNC(Sound)
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{
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// don't need to save any of the blip stuff
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NSS(period);
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NSS(volume);
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NSS(voice_volume);
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NSS(sweep_step);
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NSS(sweep_value);
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NSS(noise_control);
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NSS(control);
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NSS(output_control);
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NSS(sweep_8192_divider);
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NSS(sweep_counter);
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NSS(SampleRAMPos);
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NSS(sample_cache);
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NSS(last_v_val);
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NSS(HyperVoice);
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NSS(last_hv_val);
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NSS(period_counter);
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NSS(last_val);
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NSS(sample_pos);
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NSS(nreg);
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NSS(last_ts);
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}
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}
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