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Original commit message from CVS: * gst/nsf/Makefile.am: * gst/nsf/fds_snd.c: * gst/nsf/mmc5_snd.c: * gst/nsf/nsf.c: * gst/nsf/types.h: * gst/nsf/vrc7_snd.c: * gst/nsf/vrcvisnd.c: * gst/nsf/memguard.c: * gst/nsf/memguard.h: Remove memguard again and apply hopefully all previously dropped local patches. Should be really better than the old version now.
258 lines
6.4 KiB
C
258 lines
6.4 KiB
C
/*
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** Nofrendo (c) 1998-2000 Matthew Conte (matt@conte.com)
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**
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**
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** This program is free software; you can redistribute it and/or
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** modify it under the terms of version 2 of the GNU Library General
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** Public License as published by the Free Software Foundation.
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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 GNU
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** Library General Public License for more details. To obtain a
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** copy of the GNU Library General Public License, write to the Free
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** Software Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA.
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**
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** Any permitted reproduction of these routines, in whole or in part,
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** must bear this legend.
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**
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**
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** vrcvisnd.c
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**
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** VRCVI sound hardware emulation
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** $Id$
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*/
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#include <stdio.h>
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#include "types.h"
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#include "vrcvisnd.h"
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#include "nes_apu.h"
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static vrcvisnd_t vrcvi;
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static int32 vrcvi_incsize;
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/* VRCVI rectangle wave generation */
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static int32
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vrcvi_rectangle (vrcvirectangle_t * chan)
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{
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/* reg0: 0-3=volume, 4-6=duty cycle
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** reg1: 8 bits of freq
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** reg2: 0-3=high freq, 7=enable
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*/
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chan->phaseacc -= vrcvi_incsize; /* # of clocks per wave cycle */
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while (chan->phaseacc < 0) {
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chan->phaseacc += chan->freq;
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chan->adder = (chan->adder + 1) & 0x0F;
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}
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/* return if not enabled */
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if (FALSE == chan->enabled)
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return 0;
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if (chan->adder < chan->duty_flip)
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return -(chan->volume);
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else
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return chan->volume;
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}
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/* VRCVI sawtooth wave generation */
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static int32
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vrcvi_sawtooth (vrcvisawtooth_t * chan)
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{
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/* reg0: 0-5=phase accumulator bits
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** reg1: 8 bits of freq
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** reg2: 0-3=high freq, 7=enable
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*/
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chan->phaseacc -= vrcvi_incsize; /* # of clocks per wav cycle */
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while (chan->phaseacc < 0) {
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chan->phaseacc += chan->freq;
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chan->output_acc += chan->volume;
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if (7 == ++chan->adder) {
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chan->adder = 0;
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chan->output_acc = 0;
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}
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}
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/* return if not enabled */
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if (FALSE == chan->enabled)
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return 0;
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else
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return (chan->output_acc >> 3) << 9;
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}
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/* mix vrcvi sound channels together */
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static int32
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vrcvi_process (void)
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{
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int32 output;
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output = vrcvi_rectangle (&vrcvi.rectangle[0]);
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output += vrcvi_rectangle (&vrcvi.rectangle[1]);
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output += vrcvi_sawtooth (&vrcvi.saw);
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return output;
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}
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/* write to registers */
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static void
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vrcvi_write (uint32 address, uint8 value)
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{
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int chan;
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switch (address & 0xB003) {
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case 0x9000:
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case 0xA000:
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chan = (address >> 12) - 9;
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vrcvi.rectangle[chan].reg[0] = value;
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vrcvi.rectangle[chan].volume = (value & 0x0F) << 8;
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vrcvi.rectangle[chan].duty_flip = (value >> 4) + 1;
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break;
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case 0x9001:
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case 0xA001:
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chan = (address >> 12) - 9;
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vrcvi.rectangle[chan].reg[1] = value;
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vrcvi.rectangle[chan].freq =
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APU_TO_FIXED (((vrcvi.rectangle[chan].reg[2] & 0x0F) << 8) + value +
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1);
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break;
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case 0x9002:
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case 0xA002:
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chan = (address >> 12) - 9;
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vrcvi.rectangle[chan].reg[2] = value;
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vrcvi.rectangle[chan].freq =
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APU_TO_FIXED (((value & 0x0F) << 8) + vrcvi.rectangle[chan].reg[1] +
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1);
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vrcvi.rectangle[chan].enabled = (value & 0x80) ? TRUE : FALSE;
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break;
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case 0xB000:
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vrcvi.saw.reg[0] = value;
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vrcvi.saw.volume = value & 0x3F;
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break;
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case 0xB001:
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vrcvi.saw.reg[1] = value;
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vrcvi.saw.freq =
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APU_TO_FIXED ((((vrcvi.saw.reg[2] & 0x0F) << 8) + value + 1) << 1);
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break;
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case 0xB002:
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vrcvi.saw.reg[2] = value;
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vrcvi.saw.freq =
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APU_TO_FIXED ((((value & 0x0F) << 8) + vrcvi.saw.reg[1] + 1) << 1);
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vrcvi.saw.enabled = (value & 0x80) ? TRUE : FALSE;
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break;
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default:
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break;
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}
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}
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/* reset state of vrcvi sound channels */
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static void
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vrcvi_reset (void)
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{
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int i;
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/* preload regs */
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for (i = 0; i < 3; i++) {
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vrcvi_write (0x9000 + i, 0);
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vrcvi_write (0xA000 + i, 0);
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vrcvi_write (0xB000 + i, 0);
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}
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/* get the phase period from the apu */
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vrcvi_incsize = apu_getcyclerate ();
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}
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static void
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vrcvi_dummy (void)
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{
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}
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static apu_memwrite vrcvi_memwrite[] = {
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/* { 0x4040, 0x4092, ext_write }, *//* FDS sound regs */
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{0x9000, 0x9002, vrcvi_write}, /* vrc6 */
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{0xA000, 0xA002, vrcvi_write},
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{0xB000, 0xB002, vrcvi_write},
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{(uint32) - 1, (uint32) - 1, NULL}
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};
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apuext_t vrcvi_ext = {
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vrcvi_dummy, /* no init */
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vrcvi_dummy, /* no shutdown */
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vrcvi_reset,
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vrcvi_process,
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NULL, /* no reads */
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vrcvi_memwrite
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};
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/*
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** $Log$
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** Revision 1.4 2008/03/26 07:40:56 slomo
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** * gst/nsf/Makefile.am:
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** * gst/nsf/fds_snd.c:
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** * gst/nsf/mmc5_snd.c:
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** * gst/nsf/nsf.c:
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** * gst/nsf/types.h:
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** * gst/nsf/vrc7_snd.c:
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** * gst/nsf/vrcvisnd.c:
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** * gst/nsf/memguard.c:
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** * gst/nsf/memguard.h:
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** Remove memguard again and apply hopefully all previously dropped
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** local patches. Should be really better than the old version now.
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**
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** Revision 1.3 2008-03-25 15:56:13 slomo
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** Patch by: Andreas Henriksson <andreas at fatal dot set>
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** * gst/nsf/Makefile.am:
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** * gst/nsf/dis6502.h:
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** * gst/nsf/fds_snd.c:
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** * gst/nsf/fds_snd.h:
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** * gst/nsf/fmopl.c:
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** * gst/nsf/fmopl.h:
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** * gst/nsf/gstnsf.c:
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** * gst/nsf/log.c:
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** * gst/nsf/log.h:
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** * gst/nsf/memguard.c:
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** * gst/nsf/memguard.h:
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** * gst/nsf/mmc5_snd.c:
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** * gst/nsf/mmc5_snd.h:
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** * gst/nsf/nes6502.c:
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** * gst/nsf/nes6502.h:
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** * gst/nsf/nes_apu.c:
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** * gst/nsf/nes_apu.h:
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** * gst/nsf/nsf.c:
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** * gst/nsf/nsf.h:
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** * gst/nsf/osd.h:
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** * gst/nsf/types.h:
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** * gst/nsf/vrc7_snd.c:
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** * gst/nsf/vrc7_snd.h:
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** * gst/nsf/vrcvisnd.c:
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** * gst/nsf/vrcvisnd.h:
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** Update our internal nosefart to nosefart-2.7-mls to fix segfaults
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** on some files. Fixes bug #498237.
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** Remove some // comments, fix some compiler warnings and use pow()
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** instead of a slow, selfmade implementation.
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**
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** Revision 1.1 2003/04/08 20:53:01 ben
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** Adding more files...
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**
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** Revision 1.9 2000/07/04 04:51:41 matt
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** cleanups
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**
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** Revision 1.8 2000/07/03 02:18:53 matt
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** much better external module exporting
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**
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** Revision 1.7 2000/06/20 04:06:16 matt
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** migrated external sound definition to apu module
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**
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** Revision 1.6 2000/06/20 00:08:58 matt
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** changed to driver based API
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**
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** Revision 1.5 2000/06/09 16:49:02 matt
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** removed all floating point from sound generation
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**
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** Revision 1.4 2000/06/09 15:12:28 matt
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** initial revision
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**
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*/
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