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https://github.com/tildearrow/furnace.git
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VERA: bring up actual emulation core
This commit is contained in:
tildearrow
parent
587fecd11d
commit
9bd15bd513
7 changed files with 303 additions and 3 deletions
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@ -234,6 +234,8 @@ src/engine/platform/sound/gb/apu.c
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src/engine/platform/sound/gb/timing.c
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src/engine/platform/sound/pce_psg.cpp
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src/engine/platform/sound/nes/apu.c
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src/engine/platform/sound/vera_psg.c
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src/engine/platform/sound/vera_pcm.c
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src/engine/platform/sound/c64/sid.cc
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src/engine/platform/sound/c64/voice.cc
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130
src/engine/platform/sound/vera_pcm.c
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130
src/engine/platform/sound/vera_pcm.c
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@ -0,0 +1,130 @@
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// Commander X16 Emulator
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// Copyright (c) 2020 Frank van den Hoef
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// All rights reserved. License: 2-clause BSD
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#include "vera_pcm.h"
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#include <stdio.h>
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static uint8_t volume_lut[16] = {0, 1, 2, 3, 4, 5, 6, 8, 11, 14, 18, 23, 30, 38, 49, 64};
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static void
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fifo_reset(struct VERA_PCM* pcm)
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{
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pcm->fifo_wridx = 0;
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pcm->fifo_rdidx = 0;
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pcm->fifo_cnt = 0;
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}
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void
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pcm_reset(struct VERA_PCM* pcm)
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{
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fifo_reset(pcm);
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pcm->ctrl = 0;
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pcm->rate = 0;
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pcm->cur_l = 0;
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pcm->cur_r = 0;
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pcm->phase = 0;
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}
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void
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pcm_write_ctrl(struct VERA_PCM* pcm, uint8_t val)
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{
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if (val & 0x80) {
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fifo_reset(pcm);
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}
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pcm->ctrl = val & 0x3F;
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}
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uint8_t
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pcm_read_ctrl(struct VERA_PCM* pcm)
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{
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uint8_t result = pcm->ctrl;
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if (pcm->fifo_cnt == sizeof(pcm->fifo)) {
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result |= 0x80;
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}
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return result;
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}
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void
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pcm_write_rate(struct VERA_PCM* pcm, uint8_t val)
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{
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pcm->rate = val;
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}
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uint8_t
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pcm_read_rate(struct VERA_PCM* pcm)
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{
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return pcm->rate;
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}
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void
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pcm_write_fifo(struct VERA_PCM* pcm, uint8_t val)
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{
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if (pcm->fifo_cnt < sizeof(pcm->fifo)) {
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pcm->fifo[pcm->fifo_wridx++] = val;
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if (pcm->fifo_wridx == sizeof(pcm->fifo)) {
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pcm->fifo_wridx = 0;
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}
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pcm->fifo_cnt++;
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}
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}
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static uint8_t
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read_fifo(struct VERA_PCM* pcm)
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{
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if (pcm->fifo_cnt == 0) {
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return 0;
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}
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uint8_t result = pcm->fifo[pcm->fifo_rdidx++];
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if (pcm->fifo_rdidx == sizeof(pcm->fifo)) {
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pcm->fifo_rdidx = 0;
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}
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pcm->fifo_cnt--;
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return result;
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}
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bool
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pcm_is_fifo_almost_empty(struct VERA_PCM* pcm)
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{
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return pcm->fifo_cnt < 1024;
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}
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void
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pcm_render(struct VERA_PCM* pcm, int16_t* buf_l, int16_t* buf_r, unsigned num_samples)
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{
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while (num_samples--) {
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uint8_t old_phase = pcm->phase;
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pcm->phase += pcm->rate;
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if ((old_phase & 0x80) != (pcm->phase & 0x80)) {
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switch ((pcm->ctrl >> 4) & 3) {
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case 0: { // mono 8-bit
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pcm->cur_l = (int16_t)read_fifo(pcm) << 8;
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pcm->cur_r = pcm->cur_l;
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break;
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}
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case 1: { // stereo 8-bit
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pcm->cur_l = read_fifo(pcm) << 8;
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pcm->cur_r = read_fifo(pcm) << 8;
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break;
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}
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case 2: { // mono 16-bit
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pcm->cur_l = read_fifo(pcm);
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pcm->cur_l |= read_fifo(pcm) << 8;
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pcm->cur_r = pcm->cur_l;
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break;
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}
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case 3: { // stereo 16-bit
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pcm->cur_l = read_fifo(pcm);
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pcm->cur_l |= read_fifo(pcm) << 8;
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pcm->cur_r = read_fifo(pcm);
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pcm->cur_r |= read_fifo(pcm) << 8;
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break;
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}
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}
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}
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*(buf_l++) = ((int)pcm->cur_l * (int)volume_lut[pcm->ctrl & 0xF]) >> 6;
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*(buf_r++) = ((int)pcm->cur_r * (int)volume_lut[pcm->ctrl & 0xF]) >> 6;
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}
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}
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31
src/engine/platform/sound/vera_pcm.h
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31
src/engine/platform/sound/vera_pcm.h
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@ -0,0 +1,31 @@
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// Commander X16 Emulator
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// Copyright (c) 2020 Frank van den Hoef
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// All rights reserved. License: 2-clause BSD
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#pragma once
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#include <stdint.h>
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#include <stdbool.h>
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struct VERA_PCM {
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uint8_t fifo[4096 - 1]; // Actual hardware FIFO is 4kB, but you can only use 4095 bytes.
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unsigned fifo_wridx;
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unsigned fifo_rdidx;
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unsigned fifo_cnt;
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uint8_t ctrl;
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uint8_t rate;
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int16_t cur_l, cur_r;
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uint8_t phase;
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};
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void pcm_reset(struct VERA_PCM* pcm);
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void pcm_write_ctrl(struct VERA_PCM* pcm, uint8_t val);
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uint8_t pcm_read_ctrl(struct VERA_PCM* pcm);
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void pcm_write_rate(struct VERA_PCM* pcm, uint8_t val);
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uint8_t pcm_read_rate(struct VERA_PCM* pcm);
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void pcm_write_fifo(struct VERA_PCM* pcm, uint8_t val);
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void pcm_render(struct VERA_PCM* pcm, int16_t* buf_l, int16_t* buf_r, unsigned num_samples);
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bool pcm_is_fifo_almost_empty(struct VERA_PCM* pcm);
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98
src/engine/platform/sound/vera_psg.c
Normal file
98
src/engine/platform/sound/vera_psg.c
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@ -0,0 +1,98 @@
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// Commander X16 Emulator
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// Copyright (c) 2020 Frank van den Hoef
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// All rights reserved. License: 2-clause BSD
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#include "vera_psg.h"
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#include <stdlib.h>
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#include <string.h>
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enum waveform {
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WF_PULSE = 0,
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WF_SAWTOOTH,
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WF_TRIANGLE,
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WF_NOISE,
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};
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static uint8_t volume_lut[64] = {0, 1, 1, 1, 2, 2, 2, 2, 2, 2, 2, 3, 3, 3, 3, 3, 4, 4, 4, 4, 5, 5, 5, 6, 6, 7, 7, 7, 8, 8, 9, 9, 10, 11, 11, 12, 13, 14, 14, 15, 16, 17, 18, 19, 21, 22, 23, 25, 26, 28, 29, 31, 33, 35, 37, 39, 42, 44, 47, 50, 52, 56, 59, 63};
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void
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psg_reset(struct VERA_PSG* psg)
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{
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memset(psg->channels, 0, sizeof(psg->channels));
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}
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void
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psg_writereg(struct VERA_PSG* psg, uint8_t reg, uint8_t val)
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{
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reg &= 0x3f;
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int ch = reg / 4;
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int idx = reg & 3;
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switch (idx) {
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case 0: psg->channels[ch].freq = (psg->channels[ch].freq & 0xFF00) | val; break;
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case 1: psg->channels[ch].freq = (psg->channels[ch].freq & 0x00FF) | (val << 8); break;
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case 2: {
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psg->channels[ch].right = (val & 0x80) != 0;
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psg->channels[ch].left = (val & 0x40) != 0;
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psg->channels[ch].volume = volume_lut[val & 0x3F];
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break;
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}
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case 3: {
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psg->channels[ch].pw = val & 0x3F;
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psg->channels[ch].waveform = val >> 6;
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break;
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}
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}
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}
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static inline void
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render(struct VERA_PSG* psg, int16_t *left, int16_t *right)
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{
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int l = 0;
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int r = 0;
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for (int i = 0; i < 16; i++) {
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struct VERAChannel *ch = &psg->channels[i];
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unsigned new_phase = (ch->phase + ch->freq) & 0x1FFFF;
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if ((ch->phase & 0x10000) != (new_phase & 0x10000)) {
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ch->noiseval = rand() & 63;
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}
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ch->phase = new_phase;
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uint8_t v = 0;
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switch (ch->waveform) {
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case WF_PULSE: v = (ch->phase >> 10) > ch->pw ? 0 : 63; break;
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case WF_SAWTOOTH: v = ch->phase >> 11; break;
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case WF_TRIANGLE: v = (ch->phase & 0x10000) ? (~(ch->phase >> 10) & 0x3F) : ((ch->phase >> 10) & 0x3F); break;
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case WF_NOISE: v = ch->noiseval; break;
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}
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int8_t sv = (v ^ 0x20);
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if (sv & 0x20) {
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sv |= 0xC0;
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}
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int val = (int)sv * (int)ch->volume;
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if (ch->left) {
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l += val;
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}
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if (ch->right) {
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r += val;
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}
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}
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*left = l;
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*right = r;
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}
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void
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psg_render(struct VERA_PSG* psg, int16_t *buf, unsigned num_samples)
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{
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while (num_samples--) {
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render(psg, &buf[0], &buf[1]);
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buf += 2;
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}
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}
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27
src/engine/platform/sound/vera_psg.h
Normal file
27
src/engine/platform/sound/vera_psg.h
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@ -0,0 +1,27 @@
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// Commander X16 Emulator
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// Copyright (c) 2020 Frank van den Hoef
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// All rights reserved. License: 2-clause BSD
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#pragma once
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#include <stdint.h>
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#include <stdbool.h>
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struct VERAChannel {
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uint16_t freq;
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uint8_t volume;
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bool left, right;
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uint8_t pw;
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uint8_t waveform;
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unsigned phase;
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uint8_t noiseval;
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};
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struct VERA_PSG {
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struct VERAChannel channels[16];
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};
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void psg_reset(struct VERA_PSG* psg);
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void psg_writereg(struct VERA_PSG* psg, uint8_t reg, uint8_t val);
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void psg_render(struct VERA_PSG* psg, int16_t *buf, unsigned num_samples);
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@ -22,6 +22,9 @@
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#include <string.h>
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#include <math.h>
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#include "sound/vera_psg.h"
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#include "sound/vera_pcm.h"
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#define rWrite(c,a,d) {regPool[(c)*4+(a)]=(d);}
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#define rWriteLo(c,a,d) rWrite(c,a,(regPool[(c)*4+(a)]&(~0x3f))|((d)&0x3f))
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#define rWriteHi(c,a,d) rWrite(c,a,(regPool[(c)*4+(a)]&(~0xc0))|(((d)<<6)&0xc0))
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@ -69,8 +72,6 @@ void DivPlatformVERA::reset() {
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}
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chan[16].vol=15;
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chan[16].pan=3;
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noiseState=1;
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noiseOut=0;
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}
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int DivPlatformVERA::calcNoteFreq(int ch, int note) {
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@ -321,6 +322,8 @@ int DivPlatformVERA::init(DivEngine* p, int channels, int sugRate, unsigned int
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isMuted[i]=false;
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}
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parent=p;
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psg=new struct VERA_PSG;
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pcm=new struct VERA_PCM;
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dumpWrites=false;
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skipRegisterWrites=false;
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chipClock=25000000;
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@ -329,5 +332,9 @@ int DivPlatformVERA::init(DivEngine* p, int channels, int sugRate, unsigned int
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return 17;
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}
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void DivPlatformVERA::quit() {
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delete psg;
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delete pcm;
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}
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DivPlatformVERA::~DivPlatformVERA() {
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}
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@ -23,6 +23,9 @@
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#include "../instrument.h"
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#include "../macroInt.h"
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struct VERA_PSG;
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struct VERA_PCM;
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class DivPlatformVERA: public DivDispatch {
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protected:
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struct Channel {
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@ -46,8 +49,9 @@ class DivPlatformVERA: public DivDispatch {
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};
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Channel chan[17];
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bool isMuted[17];
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unsigned noiseState, noiseOut;
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unsigned char regPool[66];
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struct VERA_PSG* psg;
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struct VERA_PCM* pcm;
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int calcNoteFreq(int ch, int note);
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friend void putDispatchChan(void*,int,int);
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@ -68,6 +72,7 @@ class DivPlatformVERA: public DivDispatch {
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const char** getRegisterSheet();
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const char* getEffectName(unsigned char effect);
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int init(DivEngine* parent, int channels, int sugRate, unsigned int flags);
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void quit();
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~DivPlatformVERA();
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};
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#endif
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