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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.
399 lines
8.9 KiB
C
399 lines
8.9 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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** mmc5_snd.c
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**
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** Nintendo MMC5 sound emulation
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** $Id$
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*/
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#include <string.h>
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#include "types.h"
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#include "mmc5_snd.h"
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#include "nes_apu.h"
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/* TODO: encapsulate apu/mmc5 rectangle */
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#define APU_OVERSAMPLE
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#define APU_VOLUME_DECAY(x) ((x) -= ((x) >> 7))
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typedef struct mmc5dac_s
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{
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int32 output;
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boolean enabled;
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} mmc5dac_t;
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/* look up table madness */
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static int32 decay_lut[16];
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static int vbl_lut[32];
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/* various sound constants for sound emulation */
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/* vblank length table used for rectangles, triangle, noise */
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static const uint8 vbl_length[32] = {
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5, 127, 10, 1, 19, 2, 40, 3, 80, 4, 30, 5, 7, 6, 13, 7,
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6, 8, 12, 9, 24, 10, 48, 11, 96, 12, 36, 13, 8, 14, 16, 15
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};
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/* ratios of pos/neg pulse for rectangle waves
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** 2/16 = 12.5%, 4/16 = 25%, 8/16 = 50%, 12/16 = 75%
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** (4-bit adder in rectangles, hence the 16)
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*/
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static const int duty_lut[4] = {
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2, 4, 8, 12
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};
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static int32 mmc5_incsize;
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static uint8 mul[2];
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static mmc5rectangle_t mmc5rect[2];
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static mmc5dac_t mmc5dac;
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#define MMC5_RECTANGLE_OUTPUT chan->output_vol
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static int32
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mmc5_rectangle (mmc5rectangle_t * chan)
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{
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int32 output;
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#ifdef APU_OVERSAMPLE
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int num_times;
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int32 total;
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#endif /* APU_OVERSAMPLE */
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/* reg0: 0-3=volume, 4=envelope, 5=hold, 6-7=duty cycle
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** reg1: 0-2=sweep shifts, 3=sweep inc/dec, 4-6=sweep length, 7=sweep on
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** reg2: 8 bits of freq
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** reg3: 0-2=high freq, 7-4=vbl length counter
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*/
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APU_VOLUME_DECAY (chan->output_vol);
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if (FALSE == chan->enabled || 0 == chan->vbl_length)
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return MMC5_RECTANGLE_OUTPUT;
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/* vbl length counter */
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if (FALSE == chan->holdnote)
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chan->vbl_length--;
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/* envelope decay at a rate of (env_delay + 1) / 240 secs */
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chan->env_phase -= 4; /* 240/60 */
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while (chan->env_phase < 0) {
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chan->env_phase += chan->env_delay;
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if (chan->holdnote)
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chan->env_vol = (chan->env_vol + 1) & 0x0F;
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else if (chan->env_vol < 0x0F)
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chan->env_vol++;
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}
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if (chan->freq < APU_TO_FIXED (4))
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return MMC5_RECTANGLE_OUTPUT;
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chan->phaseacc -= mmc5_incsize; /* # of cycles per sample */
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if (chan->phaseacc >= 0)
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return MMC5_RECTANGLE_OUTPUT;
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#ifdef APU_OVERSAMPLE
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num_times = total = 0;
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if (chan->fixed_envelope)
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output = chan->volume << 8; /* fixed volume */
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else
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output = (chan->env_vol ^ 0x0F) << 8;
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#endif
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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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#ifdef APU_OVERSAMPLE
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if (chan->adder < chan->duty_flip)
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total += output;
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else
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total -= output;
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num_times++;
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#endif
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}
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#ifdef APU_OVERSAMPLE
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chan->output_vol = total / num_times;
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#else
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if (chan->fixed_envelope)
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output = chan->volume << 8; /* fixed volume */
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else
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output = (chan->env_vol ^ 0x0F) << 8;
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if (0 == chan->adder)
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chan->output_vol = output;
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else if (chan->adder == chan->duty_flip)
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chan->output_vol = -output;
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#endif
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return MMC5_RECTANGLE_OUTPUT;
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}
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static uint8
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mmc5_read (uint32 address)
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{
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uint32 retval;
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retval = (uint32) (mul[0] * mul[1]);
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switch (address) {
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case 0x5205:
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return (uint8) retval;
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case 0x5206:
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return (uint8) (retval >> 8);
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default:
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return 0xFF;
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}
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}
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/* mix vrcvi sound channels together */
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static int32
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mmc5_process (void)
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{
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int32 accum;
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accum = mmc5_rectangle (&mmc5rect[0]);
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accum += mmc5_rectangle (&mmc5rect[1]);
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if (mmc5dac.enabled)
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accum += mmc5dac.output;
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return accum;
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}
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/* write to registers */
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static void
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mmc5_write (uint32 address, uint8 value)
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{
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int chan;
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switch (address) {
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/* rectangles */
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case MMC5_WRA0:
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case MMC5_WRB0:
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chan = (address & 4) ? 1 : 0;
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mmc5rect[chan].regs[0] = value;
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mmc5rect[chan].volume = value & 0x0F;
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mmc5rect[chan].env_delay = decay_lut[value & 0x0F];
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mmc5rect[chan].holdnote = (value & 0x20) ? TRUE : FALSE;
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mmc5rect[chan].fixed_envelope = (value & 0x10) ? TRUE : FALSE;
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mmc5rect[chan].duty_flip = duty_lut[value >> 6];
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break;
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case MMC5_WRA1:
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case MMC5_WRB1:
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break;
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case MMC5_WRA2:
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case MMC5_WRB2:
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chan = (address & 4) ? 1 : 0;
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mmc5rect[chan].regs[2] = value;
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if (mmc5rect[chan].enabled)
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mmc5rect[chan].freq =
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APU_TO_FIXED ((((mmc5rect[chan].regs[3] & 7) << 8) + value) + 1);
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break;
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case MMC5_WRA3:
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case MMC5_WRB3:
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chan = (address & 4) ? 1 : 0;
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mmc5rect[chan].regs[3] = value;
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if (mmc5rect[chan].enabled) {
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mmc5rect[chan].vbl_length = vbl_lut[value >> 3];
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mmc5rect[chan].env_vol = 0;
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mmc5rect[chan].freq =
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APU_TO_FIXED ((((value & 7) << 8) + mmc5rect[chan].regs[2]) + 1);
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mmc5rect[chan].adder = 0;
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}
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break;
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case MMC5_SMASK:
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if (value & 0x01)
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mmc5rect[0].enabled = TRUE;
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else {
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mmc5rect[0].enabled = FALSE;
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mmc5rect[0].vbl_length = 0;
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}
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if (value & 0x02)
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mmc5rect[1].enabled = TRUE;
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else {
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mmc5rect[1].enabled = FALSE;
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mmc5rect[1].vbl_length = 0;
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}
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break;
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case 0x5010:
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if (value & 0x01)
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mmc5dac.enabled = TRUE;
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else
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mmc5dac.enabled = FALSE;
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break;
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case 0x5011:
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mmc5dac.output = (value ^ 0x80) << 8;
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break;
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case 0x5205:
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mul[0] = value;
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break;
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case 0x5206:
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mul[1] = value;
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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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mmc5_reset (void)
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{
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int i;
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/* get the phase period from the apu */
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mmc5_incsize = apu_getcyclerate ();
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for (i = 0x5000; i < 0x5008; i++)
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mmc5_write (i, 0);
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mmc5_write (0x5010, 0);
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mmc5_write (0x5011, 0);
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}
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static void
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mmc5_init (void)
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{
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int i;
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int num_samples = apu_getcontext ()->num_samples;
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/* lut used for enveloping and frequency sweeps */
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for (i = 0; i < 16; i++)
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decay_lut[i] = num_samples * (i + 1);
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/* used for note length, based on vblanks and size of audio buffer */
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for (i = 0; i < 32; i++)
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vbl_lut[i] = vbl_length[i] * num_samples;
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}
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/* TODO: bleh */
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static void
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mmc5_shutdown (void)
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{
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}
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static apu_memread mmc5_memread[] = {
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{0x5205, 0x5206, mmc5_read},
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{(uint32) - 1, (uint32) - 1, NULL}
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};
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static apu_memwrite mmc5_memwrite[] = {
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{0x5000, 0x5015, mmc5_write},
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{0x5205, 0x5206, mmc5_write},
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{(uint32) - 1, (uint32) - 1, NULL}
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};
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apuext_t mmc5_ext = {
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mmc5_init,
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mmc5_shutdown,
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mmc5_reset,
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mmc5_process,
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mmc5_memread,
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mmc5_memwrite
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};
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/*
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** $Log$
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** Revision 1.4 2008/03/26 07:40:55 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 15:56:11 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 1.6 2000/07/04 04:51:41 matt
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** cleanups
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**
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** Revision 1.5 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 1.4 2000/06/28 22:03:51 matt
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** fixed stupid oversight
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**
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** Revision 1.3 2000/06/20 20:46:58 matt
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** minor cleanups
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**
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** Revision 1.2 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 1.1 2000/06/20 00:06:47 matt
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** initial revision
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**
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*/
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