diff options
Diffstat (limited to 'src/libxineadec/nosefart/vrcvisnd.c')
| -rw-r--r-- | src/libxineadec/nosefart/vrcvisnd.c | 210 |
1 files changed, 0 insertions, 210 deletions
diff --git a/src/libxineadec/nosefart/vrcvisnd.c b/src/libxineadec/nosefart/vrcvisnd.c deleted file mode 100644 index b1f26fe52..000000000 --- a/src/libxineadec/nosefart/vrcvisnd.c +++ /dev/null @@ -1,210 +0,0 @@ -/* -** Nofrendo (c) 1998-2000 Matthew Conte (matt@conte.com) -** -** -** This program is free software; you can redistribute it and/or -** modify it under the terms of version 2 of the GNU Library General -** Public License as published by the Free Software Foundation. -** -** This program is distributed in the hope that it will be useful, -** but WITHOUT ANY WARRANTY; without even the implied warranty of -** MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU -** Library General Public License for more details. To obtain a -** copy of the GNU Library General Public License, write to the Free -** Software Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA. -** -** Any permitted reproduction of these routines, in whole or in part, -** must bear this legend. -** -** -** vrcvisnd.c -** -** VRCVI sound hardware emulation -** $Id: vrcvisnd.c,v 1.2 2003/12/05 15:55:01 f1rmb Exp $ -*/ - -#include "types.h" -#include "vrcvisnd.h" -#include "nes_apu.h" - - -static vrcvisnd_t vrcvi; -static int32 vrcvi_incsize; - -/* VRCVI rectangle wave generation */ -static int32 vrcvi_rectangle(vrcvirectangle_t *chan) -{ - /* reg0: 0-3=volume, 4-6=duty cycle - ** reg1: 8 bits of freq - ** reg2: 0-3=high freq, 7=enable - */ - - chan->phaseacc -= vrcvi_incsize; /* # of clocks per wave cycle */ - while (chan->phaseacc < 0) - { - chan->phaseacc += chan->freq; - chan->adder = (chan->adder + 1) & 0x0F; - } - - /* return if not enabled */ - if (FALSE == chan->enabled) - return 0; - - if (chan->adder < chan->duty_flip) - return -(chan->volume); - else - return chan->volume; -} - -/* VRCVI sawtooth wave generation */ -static int32 vrcvi_sawtooth(vrcvisawtooth_t *chan) -{ - /* reg0: 0-5=phase accumulator bits - ** reg1: 8 bits of freq - ** reg2: 0-3=high freq, 7=enable - */ - - chan->phaseacc -= vrcvi_incsize; /* # of clocks per wav cycle */ - while (chan->phaseacc < 0) - { - chan->phaseacc += chan->freq; - chan->output_acc += chan->volume; - - if (7 == ++chan->adder) - { - chan->adder = 0; - chan->output_acc = 0; - } - } - - /* return if not enabled */ - if (FALSE == chan->enabled) - return 0; - else - return (chan->output_acc >> 3) << 9; -} - -/* mix vrcvi sound channels together */ -static int32 vrcvi_process(void) -{ - int32 output; - - output = vrcvi_rectangle(&vrcvi.rectangle[0]); - output += vrcvi_rectangle(&vrcvi.rectangle[1]); - output += vrcvi_sawtooth(&vrcvi.saw); - - return output; -} - -/* write to registers */ -static void vrcvi_write(uint32 address, uint8 value) -{ - int chan; - - switch (address & 0xB003) - { - case 0x9000: - case 0xA000: - chan = (address >> 12) - 9; - vrcvi.rectangle[chan].reg[0] = value; - vrcvi.rectangle[chan].volume = (value & 0x0F) << 8; - vrcvi.rectangle[chan].duty_flip = (value >> 4) + 1; - break; - case 0x9001: - case 0xA001: - chan = (address >> 12) - 9; - vrcvi.rectangle[chan].reg[1] = value; - vrcvi.rectangle[chan].freq = APU_TO_FIXED(((vrcvi.rectangle[chan].reg[2] & 0x0F) << 8) + value + 1); - break; - case 0x9002: - case 0xA002: - chan = (address >> 12) - 9; - vrcvi.rectangle[chan].reg[2] = value; - vrcvi.rectangle[chan].freq = APU_TO_FIXED(((value & 0x0F) << 8) + vrcvi.rectangle[chan].reg[1] + 1); - vrcvi.rectangle[chan].enabled = (value & 0x80) ? TRUE : FALSE; - break; - case 0xB000: - vrcvi.saw.reg[0] = value; - vrcvi.saw.volume = value & 0x3F; - break; - case 0xB001: - vrcvi.saw.reg[1] = value; - vrcvi.saw.freq = APU_TO_FIXED((((vrcvi.saw.reg[2] & 0x0F) << 8) + value + 1) << 1); - break; - case 0xB002: - vrcvi.saw.reg[2] = value; - vrcvi.saw.freq = APU_TO_FIXED((((value & 0x0F) << 8) + vrcvi.saw.reg[1] + 1) << 1); - vrcvi.saw.enabled = (value & 0x80) ? TRUE : FALSE; - break; - default: - break; - } -} - -/* reset state of vrcvi sound channels */ -static void vrcvi_reset(void) -{ - int i; - - /* preload regs */ - for (i = 0; i < 3; i++) - { - vrcvi_write(0x9000 + i, 0); - vrcvi_write(0xA000 + i, 0); - vrcvi_write(0xB000 + i, 0); - } - - /* get the phase period from the apu */ - vrcvi_incsize = apu_getcyclerate(); -} - -static void vrcvi_dummy(void) -{ -} - -static apu_memwrite vrcvi_memwrite[] = -{ -// { 0x4040, 0x4092, ext_write }, /* FDS sound regs */ - { 0x9000, 0x9002, vrcvi_write }, /* vrc6 */ - { 0xA000, 0xA002, vrcvi_write }, - { 0xB000, 0xB002, vrcvi_write }, - { -1, -1, NULL } -}; - -apuext_t vrcvi_ext = -{ - vrcvi_dummy, /* no init */ - vrcvi_dummy, /* no shutdown */ - vrcvi_reset, - vrcvi_process, - NULL, /* no reads */ - vrcvi_memwrite -}; - -/* -** $Log: vrcvisnd.c,v $ -** Revision 1.2 2003/12/05 15:55:01 f1rmb -** cleanup phase II. use xprintf when it's relevant, use xine_xmalloc when it's relevant too. Small other little fix (can't remember). Change few internal function prototype because it xine_t pointer need to be used if some xine's internal sections. NOTE: libdvd{nav,read} is still too noisy, i will take a look to made it quit, without invasive changes. To be continued... -** -** Revision 1.1 2003/01/08 07:04:36 tmmm -** initial import of Nosefart sources -** -** Revision 1.9 2000/07/04 04:51:41 matt -** cleanups -** -** Revision 1.8 2000/07/03 02:18:53 matt -** much better external module exporting -** -** Revision 1.7 2000/06/20 04:06:16 matt -** migrated external sound definition to apu module -** -** Revision 1.6 2000/06/20 00:08:58 matt -** changed to driver based API -** -** Revision 1.5 2000/06/09 16:49:02 matt -** removed all floating point from sound generation -** -** Revision 1.4 2000/06/09 15:12:28 matt -** initial revision -** -*/ |