mirror of
https://github.com/retro100/dosbox-wii.git
synced 2024-06-28 15:16:11 +02:00
358 lines
8.6 KiB
C++
358 lines
8.6 KiB
C++
/*
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* Copyright (C) 2002-2019 The DOSBox Team
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*
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* This program is free software; you can redistribute it and/or modify
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* it under the terms of the GNU General Public License as published by
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* the Free Software Foundation; either version 2 of the License, or
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* (at your option) any later version.
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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
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* GNU General Public License for more details.
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*
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* You should have received a copy of the GNU General Public License along
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* with this program; if not, write to the Free Software Foundation, Inc.,
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* 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301, USA.
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*/
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/*
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Based of sn76496.c of the M.A.M.E. project
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*/
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#include "dosbox.h"
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#include "inout.h"
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#include "mixer.h"
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#include "mem.h"
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#include "setup.h"
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#include "pic.h"
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#include "dma.h"
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#include "hardware.h"
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#include <cstring>
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#include <math.h>
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#include "mame/emu.h"
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#include "mame/sn76496.h"
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#define SOUND_CLOCK (14318180 / 4)
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#define TDAC_DMA_BUFSIZE 1024
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static struct {
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MixerChannel * chan;
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bool enabled;
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Bitu last_write;
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struct {
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MixerChannel * chan;
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bool enabled;
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struct {
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Bitu base;
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Bit8u irq,dma;
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} hw;
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struct {
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Bitu rate;
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Bit8u buf[TDAC_DMA_BUFSIZE];
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Bit8u last_sample;
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DmaChannel * chan;
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bool transfer_done;
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} dma;
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Bit8u mode,control;
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Bit16u frequency;
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Bit8u amplitude;
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bool irq_activated;
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} dac;
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} tandy;
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static sn76496_device device_sn76496(machine_config(), 0, 0, SOUND_CLOCK );
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static ncr8496_device device_ncr8496(machine_config(), 0, 0, SOUND_CLOCK);
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static sn76496_base_device* activeDevice = &device_ncr8496;
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#define device (*activeDevice)
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static void SN76496Write(Bitu /*port*/,Bitu data,Bitu /*iolen*/) {
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tandy.last_write=PIC_Ticks;
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if (!tandy.enabled) {
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tandy.chan->Enable(true);
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tandy.enabled=true;
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}
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device.write(data);
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// LOG_MSG("3voice write %X at time %7.3f",data,PIC_FullIndex());
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}
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static void SN76496Update(Bitu length) {
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//Disable the channel if it's been quiet for a while
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if ((tandy.last_write+5000)<PIC_Ticks) {
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tandy.enabled=false;
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tandy.chan->Enable(false);
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return;
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}
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const Bitu MAX_SAMPLES = 2048;
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if (length > MAX_SAMPLES)
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return;
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Bit16s buffer[MAX_SAMPLES];
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Bit16s* outputs = buffer;
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device_sound_interface::sound_stream stream;
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static_cast<device_sound_interface&>(device).sound_stream_update(stream, 0, &outputs, length);
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tandy.chan->AddSamples_m16(length, buffer);
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}
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bool TS_Get_Address(Bitu& tsaddr, Bitu& tsirq, Bitu& tsdma) {
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tsaddr=0;
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tsirq =0;
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tsdma =0;
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if (tandy.dac.enabled) {
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tsaddr=tandy.dac.hw.base;
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tsirq =tandy.dac.hw.irq;
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tsdma =tandy.dac.hw.dma;
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return true;
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}
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return false;
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}
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static void TandyDAC_DMA_CallBack(DmaChannel * /*chan*/, DMAEvent event) {
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if (event == DMA_REACHED_TC) {
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tandy.dac.dma.transfer_done=true;
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PIC_ActivateIRQ(tandy.dac.hw.irq);
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}
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}
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static void TandyDACModeChanged(void) {
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switch (tandy.dac.mode&3) {
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case 0:
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// joystick mode
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break;
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case 1:
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break;
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case 2:
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// recording
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break;
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case 3:
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// playback
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tandy.dac.chan->FillUp();
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if (tandy.dac.frequency!=0) {
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float freq=3579545.0f/((float)tandy.dac.frequency);
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tandy.dac.chan->SetFreq((Bitu)freq);
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float vol=((float)tandy.dac.amplitude)/7.0f;
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tandy.dac.chan->SetVolume(vol,vol);
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if ((tandy.dac.mode&0x0c)==0x0c) {
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tandy.dac.dma.transfer_done=false;
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tandy.dac.dma.chan=GetDMAChannel(tandy.dac.hw.dma);
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if (tandy.dac.dma.chan) {
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tandy.dac.dma.chan->Register_Callback(TandyDAC_DMA_CallBack);
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tandy.dac.chan->Enable(true);
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// LOG_MSG("Tandy DAC: playback started with freqency %f, volume %f",freq,vol);
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}
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}
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}
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break;
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}
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}
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static void TandyDACDMAEnabled(void) {
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TandyDACModeChanged();
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}
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static void TandyDACDMADisabled(void) {
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}
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static void TandyDACWrite(Bitu port,Bitu data,Bitu /*iolen*/) {
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switch (port) {
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case 0xc4: {
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Bitu oldmode = tandy.dac.mode;
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tandy.dac.mode = (Bit8u)(data&0xff);
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if ((data&3)!=(oldmode&3)) {
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TandyDACModeChanged();
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}
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if (((data&0x0c)==0x0c) && ((oldmode&0x0c)!=0x0c)) {
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TandyDACDMAEnabled();
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} else if (((data&0x0c)!=0x0c) && ((oldmode&0x0c)==0x0c)) {
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TandyDACDMADisabled();
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}
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}
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break;
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case 0xc5:
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switch (tandy.dac.mode&3) {
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case 0:
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// joystick mode
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break;
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case 1:
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tandy.dac.control = (Bit8u)(data&0xff);
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break;
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case 2:
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break;
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case 3:
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// direct output
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break;
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}
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break;
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case 0xc6:
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tandy.dac.frequency = (tandy.dac.frequency & 0xf00) | (Bit8u)(data & 0xff);
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switch (tandy.dac.mode&3) {
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case 0:
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// joystick mode
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break;
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case 1:
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case 2:
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case 3:
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TandyDACModeChanged();
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break;
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}
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break;
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case 0xc7:
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tandy.dac.frequency = (tandy.dac.frequency & 0x00ff) | (((Bit8u)(data & 0xf)) << 8);
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tandy.dac.amplitude = (Bit8u)(data>>5);
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switch (tandy.dac.mode&3) {
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case 0:
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// joystick mode
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break;
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case 1:
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case 2:
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case 3:
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TandyDACModeChanged();
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break;
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}
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break;
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}
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}
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static Bitu TandyDACRead(Bitu port,Bitu /*iolen*/) {
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switch (port) {
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case 0xc4:
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return (tandy.dac.mode&0x77) | (tandy.dac.irq_activated ? 0x08 : 0x00);
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case 0xc6:
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return (Bit8u)(tandy.dac.frequency&0xff);
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case 0xc7:
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return (Bit8u)(((tandy.dac.frequency>>8)&0xf) | (tandy.dac.amplitude<<5));
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}
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LOG_MSG("Tandy DAC: Read from unknown %X",port);
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return 0xff;
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}
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static void TandyDACGenerateDMASound(Bitu length) {
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if (length) {
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Bitu read=tandy.dac.dma.chan->Read(length,tandy.dac.dma.buf);
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tandy.dac.chan->AddSamples_m8(read,tandy.dac.dma.buf);
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if (read < length) {
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if (read>0) tandy.dac.dma.last_sample=tandy.dac.dma.buf[read-1];
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for (Bitu ct=read; ct < length; ct++) {
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tandy.dac.chan->AddSamples_m8(1,&tandy.dac.dma.last_sample);
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}
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}
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}
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}
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static void TandyDACUpdate(Bitu length) {
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if (tandy.dac.enabled && ((tandy.dac.mode&0x0c)==0x0c)) {
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if (!tandy.dac.dma.transfer_done) {
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Bitu len = length;
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TandyDACGenerateDMASound(len);
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} else {
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for (Bitu ct=0; ct < length; ct++) {
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tandy.dac.chan->AddSamples_m8(1,&tandy.dac.dma.last_sample);
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}
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}
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} else {
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tandy.dac.chan->AddSilence();
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}
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}
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class TANDYSOUND: public Module_base {
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private:
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IO_WriteHandleObject WriteHandler[4];
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IO_ReadHandleObject ReadHandler[4];
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MixerObject MixerChan;
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MixerObject MixerChanDAC;
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public:
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TANDYSOUND(Section* configuration):Module_base(configuration){
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Section_prop * section=static_cast<Section_prop *>(configuration);
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bool enable_hw_tandy_dac=true;
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Bitu sbport, sbirq, sbdma;
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if (SB_Get_Address(sbport, sbirq, sbdma)) {
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enable_hw_tandy_dac=false;
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}
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//Select the correct tandy chip implementation
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if (machine == MCH_PCJR) activeDevice = &device_sn76496;
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else activeDevice = &device_ncr8496;
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real_writeb(0x40,0xd4,0x00);
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if (IS_TANDY_ARCH) {
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/* enable tandy sound if tandy=true/auto */
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if ((strcmp(section->Get_string("tandy"),"true")!=0) &&
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(strcmp(section->Get_string("tandy"),"on")!=0) &&
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(strcmp(section->Get_string("tandy"),"auto")!=0)) return;
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} else {
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/* only enable tandy sound if tandy=true */
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if ((strcmp(section->Get_string("tandy"),"true")!=0) &&
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(strcmp(section->Get_string("tandy"),"on")!=0)) return;
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/* ports from second DMA controller conflict with tandy ports */
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CloseSecondDMAController();
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if (enable_hw_tandy_dac) {
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WriteHandler[2].Install(0x1e0,SN76496Write,IO_MB,2);
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WriteHandler[3].Install(0x1e4,TandyDACWrite,IO_MB,4);
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// ReadHandler[3].Install(0x1e4,TandyDACRead,IO_MB,4);
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}
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}
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Bit32u sample_rate = section->Get_int("tandyrate");
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tandy.chan=MixerChan.Install(&SN76496Update,sample_rate,"TANDY");
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WriteHandler[0].Install(0xc0,SN76496Write,IO_MB,2);
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if (enable_hw_tandy_dac) {
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// enable low-level Tandy DAC emulation
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WriteHandler[1].Install(0xc4,TandyDACWrite,IO_MB,4);
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ReadHandler[1].Install(0xc4,TandyDACRead,IO_MB,4);
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tandy.dac.enabled=true;
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tandy.dac.chan=MixerChanDAC.Install(&TandyDACUpdate,sample_rate,"TANDYDAC");
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tandy.dac.hw.base=0xc4;
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tandy.dac.hw.irq =7;
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tandy.dac.hw.dma =1;
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} else {
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tandy.dac.enabled=false;
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tandy.dac.hw.base=0;
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tandy.dac.hw.irq =0;
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tandy.dac.hw.dma =0;
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}
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tandy.dac.control=0;
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tandy.dac.mode =0;
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tandy.dac.irq_activated=false;
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tandy.dac.frequency=0;
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tandy.dac.amplitude=0;
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tandy.dac.dma.last_sample=0;
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tandy.enabled=false;
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real_writeb(0x40,0xd4,0xff); /* BIOS Tandy DAC initialization value */
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((device_t&)device).device_start();
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device.convert_samplerate(sample_rate);
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}
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~TANDYSOUND(){ }
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};
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static TANDYSOUND* test;
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void TANDYSOUND_ShutDown(Section* /*sec*/) {
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delete test;
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}
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void TANDYSOUND_Init(Section* sec) {
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test = new TANDYSOUND(sec);
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sec->AddDestroyFunction(&TANDYSOUND_ShutDown,true);
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}
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