Prepare for C140
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7 changed files with 867 additions and 6 deletions
183
src/engine/platform/sound/c140.c
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183
src/engine/platform/sound/c140.c
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/*
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============================================================================
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Namco C140 sound emulator
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by cam900
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This file is licensed under zlib license.
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============================================================================
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zlib License
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(C) 2023-present cam900 and contributors
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This software is provided 'as-is', without any express or implied
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warranty. In no event will the authors be held liable for any damages
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arising from the use of this software.
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Permission is granted to anyone to use this software for any purpose,
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including commercial applications, and to alter it and redistribute it
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freely, subject to the following restrictions:
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1. The origin of this software must not be misrepresented; you must not
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claim that you wrote the original software. If you use this software
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in a product, an acknowledgment in the product documentation would be
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appreciated but is not required.
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2. Altered source versions must be plainly marked as such, and must not be
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misrepresented as being the original software.
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3. This notice may not be removed or altered from any source distribution.
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============================================================================
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TODO:
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- unknown registers (Bit 6 of control register, etc)
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- Internal timer
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*/
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#include "c140.h"
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static int c140_max(int a, int b) { return (a > b) ? a : b; }
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static int c140_min(int a, int b) { return (a < b) ? a : b; }
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static int c140_clamp(int v, int min, int max) { return c140_min(c140_max(v,min),max); }
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static int c140_bit(int val, int bit) { return (val >> bit) & 1; }
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void c140_tick(struct c140_t *c140, const int cycle)
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{
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for (int i = 0; i < 24; i++)
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{
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c140_voice_tick(c140, i, cycle);
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c140->lout += c140->voice[i].lout;
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c140->rout += c140->voice[i].rout;
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}
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// scale as 16bit
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c140->lout >>= 5;
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c140->rout >>= 5;
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}
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void c140_voice_tick(struct c140_t *c140, const unsigned char voice, const int cycle)
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{
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struct c140_voice_t *c140_voice = &c140->voice[voice];
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if (c140_voice->busy && c140_voice->keyon)
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{
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for (int c = 0; c < cycle; c++)
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{
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c140_voice->frac += c140_voice->freq;
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if (c140_voice->frac > 0xffff)
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{
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c140_voice->addr += c140_voice->frac >> 16;
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if (c140_voice->addr > c140_voice->end_addr)
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{
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if (c140_voice->loop)
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{
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c140_voice->addr = (c140_voice->addr + c140_voice->end_addr) - c140_voice->loop_addr;
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}
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else
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{
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c140_voice->keyon = false;
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}
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}
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c140_voice->frac &= 0xffff;
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}
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// fetch 12 bit sample
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signed short s1 = c140->read_sample(c140_voice->bank, c140_voice->addr) & ~0xf;
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signed short s2 = c140->read_sample(c140_voice->bank, c140_voice->addr + 1) & ~0xf;
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if (c140_voice->compressed)
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{
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s1 = c140->mulaw[(s1 >> 8) & 0xff];
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s2 = c140->mulaw[(s2 >> 8) & 0xff];
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}
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// interpolate
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signed int sample = s1 + (((c140_voice->frac) * (s2 - s1)) >> 16);
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c140_voice->lout = sample * c140_voice->lvol;
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c140_voice->rout = sample * c140_voice->rvol;
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}
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}
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else
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{
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c140_voice->lout = 0;
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c140_voice->rout = 0;
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}
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}
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void c140_keyon(struct c140_voice_t *c140_voice)
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{
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c140_voice->busy = true;
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c140_voice->keyon = true;
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c140_voice->frac = 0;
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c140_voice->addr = c140_voice->start_addr;
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}
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void c140_init(struct c140_t *c140)
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{
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// u-law table verified from Wii Virtual Console Arcade Starblade
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for (int i = 0; i < 256; i++)
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{
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int j = (signed char)i;
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signed char s1 = j & 7;
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signed char s2 = abs(j >> 3) & 31;
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c140->mulaw[i] = 0x80 << s1 & 0xff00;
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c140->mulaw[i] += s2 << (s1 ? s1 + 3 : 4);
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if (j < 0)
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c140->mulaw[i] = -c140->mulaw[i];
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}
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}
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void c140_reset(struct c140_t *c140)
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{
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for (int i = 0; i < 24; i++)
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{
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c140->voice[i].busy = false;
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c140->voice[i].keyon = false;
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c140->voice[i].freq = 0;
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c140->voice[i].bank = 0;
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c140->voice[i].start_addr = 0;
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c140->voice[i].loop_addr = 0;
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c140->voice[i].end_addr = 0;
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c140->voice[i].lvol = 0;
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c140->voice[i].rvol = 0;
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c140->voice[i].compressed = false;
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c140->voice[i].loop = false;
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c140->voice[i].addr = 0;
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c140->voice[i].frac = 0;
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c140->voice[i].lout = 0;
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c140->voice[i].rout = 0;
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}
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}
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void c140_write(struct c140_t *c140, const unsigned short addr, const unsigned char data)
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{
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// voice register
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if (addr < 0x180)
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{
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struct c140_voice_t *voice = &c140->voice[addr >> 4];
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switch (addr & 0xf)
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{
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case 0x0: voice->rvol = data; break;
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case 0x1: voice->lvol = data; break;
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case 0x2: voice->freq = (voice->freq & ~0xff00) | (unsigned int)(data << 8); break;
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case 0x3: voice->freq = (voice->freq & ~0x00ff) | data; break;
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case 0x4: voice->bank = data; break;
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case 0x5:
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voice->compressed = c140_bit(data, 3);
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voice->loop = c140_bit(data, 4);
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if (data & 0x80)
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c140_keyon(voice);
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else
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voice->busy = false;
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break;
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case 0x6: voice->start_addr = (voice->start_addr & ~0xff00) | (unsigned int)(data << 8); break;
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case 0x7: voice->start_addr = (voice->start_addr & ~0x00ff) | data; break;
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case 0x8: voice->end_addr = (voice->end_addr & ~0xff00) | (unsigned int)(data << 8); break;
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case 0x9: voice->end_addr = (voice->end_addr & ~0x00ff) | data; break;
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case 0xa: voice->loop_addr = (voice->loop_addr & ~0xff00) | (unsigned int)(data << 8); break;
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case 0xb: voice->loop_addr = (voice->loop_addr & ~0x00ff) | data; break;
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default: break;
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}
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}
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// Timer
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}
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91
src/engine/platform/sound/c140.h
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91
src/engine/platform/sound/c140.h
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@ -0,0 +1,91 @@
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/*
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============================================================================
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Namco C140 sound emulator
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by cam900
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This file is licensed under zlib license.
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============================================================================
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zlib License
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(C) 2023-present cam900 and contributors
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This software is provided 'as-is', without any express or implied
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warranty. In no event will the authors be held liable for any damages
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arising from the use of this software.
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Permission is granted to anyone to use this software for any purpose,
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including commercial applications, and to alter it and redistribute it
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freely, subject to the following restrictions:
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1. The origin of this software must not be misrepresented; you must not
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claim that you wrote the original software. If you use this software
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in a product, an acknowledgment in the product documentation would be
|
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appreciated but is not required.
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2. Altered source versions must be plainly marked as such, and must not be
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misrepresented as being the original software.
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3. This notice may not be removed or altered from any source distribution.
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============================================================================
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TODO:
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- unknown registers (Bit 6 of control register, etc)
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- Internal timer
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*/
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#ifndef _C140_EMU_H
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#define _C140_EMU_H
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#include <stdbool.h>
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#ifdef __cplusplus
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extern "C"
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{
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#endif
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struct c140_voice_t
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{
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bool busy; // busy flag
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bool keyon; // key on flag
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unsigned short freq; // sample frequency
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unsigned char bank; // sample bank
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unsigned short start_addr; // sample start address
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unsigned short loop_addr; // sample loop address
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unsigned short end_addr; // sample end address
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int lvol, rvol; // left/right volume
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bool compressed; // compressed sample flag
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bool loop; // loop flag
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unsigned short addr; // sample address
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int frac; // frequency counter (.16 fixed point)
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int lout, rout; // left/right output
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};
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struct c140_t
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{
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struct c140_voice_t voice[24];
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signed int lout, rout;
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signed short mulaw[256];
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unsigned short (*read_sample)(unsigned char bank, unsigned short addr);
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};
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void c140_tick(struct c140_t *c140, const int cycle);
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void c140_voice_tick(struct c140_t *c140, const unsigned char voice, const int cycle);
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void c140_keyon(struct c140_voice_t *c140_voice);
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void c140_write(struct c140_t *c140, const unsigned short addr, const unsigned char data);
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void c140_init(struct c140_t *c140);
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void c140_reset(struct c140_t *c140);
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#ifdef __cplusplus
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} // extern "C"
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#endif
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#endif // _C140_EMU_H
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