118 lines
3.1 KiB
C++
118 lines
3.1 KiB
C++
/**
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* Furnace Tracker - multi-system chiptune tracker
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* Copyright (C) 2021-2022 tildearrow and contributors
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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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#include "dummy.h"
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#include "../engine.h"
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#include <stdio.h>
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#include <math.h>
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void DivPlatformDummy::acquire(short* bufL, short* bufR, size_t start, size_t len) {
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for (size_t i=start; i<start+len; i++) {
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bufL[i]=0;
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for (unsigned char j=0; j<chans; j++) {
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if (chan[j].active) {
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if (!isMuted[j]) bufL[i]+=(((signed short)chan[j].pos)*chan[j].amp*chan[j].vol)>>13;
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chan[j].pos+=chan[j].freq;
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}
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}
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}
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}
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void DivPlatformDummy::muteChannel(int ch, bool mute) {
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isMuted[ch]=mute;
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}
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void DivPlatformDummy::tick() {
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for (unsigned char i=0; i<chans; i++) {
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chan[i].amp-=3;
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if (chan[i].amp<16) chan[i].amp=16;
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if (chan[i].freqChanged) {
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chan[i].freqChanged=false;
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chan[i].freq=parent->calcFreq(chan[i].baseFreq,chan[i].pitch);
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}
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}
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}
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void* DivPlatformDummy::getChanState(int ch) {
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return &chan[ch];
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}
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int DivPlatformDummy::dispatch(DivCommand c) {
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switch (c.cmd) {
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case DIV_CMD_NOTE_ON:
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if (c.value!=DIV_NOTE_NULL) {
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chan[c.chan].baseFreq=65.6f*pow(2.0f,((float)c.value/12.0f));
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chan[c.chan].freqChanged=true;
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}
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chan[c.chan].active=true;
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chan[c.chan].amp=64;
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break;
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case DIV_CMD_NOTE_OFF:
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chan[c.chan].active=false;
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break;
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case DIV_CMD_VOLUME:
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chan[c.chan].vol=c.value;
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if (chan[c.chan].vol>15) chan[c.chan].vol=15;
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break;
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case DIV_CMD_GET_VOLUME:
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return chan[c.chan].vol;
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break;
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case DIV_CMD_PITCH:
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chan[c.chan].pitch=c.value;
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chan[c.chan].freqChanged=true;
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break;
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case DIV_CMD_LEGATO:
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chan[c.chan].baseFreq=65.6f*pow(2.0f,((float)c.value/12.0f));
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chan[c.chan].freqChanged=true;
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break;
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case DIV_CMD_GET_VOLMAX:
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return 15;
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break;
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default:
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break;
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}
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return 1;
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}
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void DivPlatformDummy::reset() {
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for (int i=0; i<chans; i++) {
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chan[i]=DivPlatformDummy::Channel();
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chan[i].vol=0x0f;
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}
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}
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int DivPlatformDummy::init(DivEngine* p, int channels, int sugRate, unsigned int flags) {
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parent=p;
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dumpWrites=false;
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skipRegisterWrites=false;
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for (int i=0; i<DIV_MAX_CHANS; i++) {
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isMuted[i]=false;
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}
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rate=65536;
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chans=channels;
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reset();
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return channels;
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}
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void DivPlatformDummy::quit() {
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}
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DivPlatformDummy::~DivPlatformDummy() {
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} |