85 lines
2.4 KiB
C++
85 lines
2.4 KiB
C++
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/**
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* Furnace Tracker - multi-system chiptune tracker
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* Copyright (C) 2021-2023 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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#define _USE_MATH_DEFINES
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#include "gui.h"
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#include "../../extern/opn/ym3438.h"
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#define FM_WRITE(addr,val) \
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OPN2_Write(&fm,0,(addr)); \
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do { \
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OPN2_Clock(&fm,out); \
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} while (fm.write_busy); \
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OPN2_Write(&fm,1,(val)); \
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do { \
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OPN2_Clock(&fm,out); \
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} while (fm.write_busy); \
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void FurnaceGUI::renderFMPreview(const DivInstrumentFM& params, int pos) {
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ym3438_t fm;
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short out[2];
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int aOut=0;
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OPN2_Reset(&fm);
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OPN2_SetChipType(&fm,ym3438_mode_opn);
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// set params
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FM_WRITE(0x50,31); // AR
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FM_WRITE(0x54,31);
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FM_WRITE(0x58,31);
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FM_WRITE(0x5c,31);
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FM_WRITE(0x60,0); // DR
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FM_WRITE(0x64,0);
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FM_WRITE(0x68,0);
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FM_WRITE(0x6c,0);
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FM_WRITE(0x70,0); // D2R
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FM_WRITE(0x74,0);
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FM_WRITE(0x78,0);
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FM_WRITE(0x7c,0);
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FM_WRITE(0x80,0); // SL/RR
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FM_WRITE(0x84,0);
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FM_WRITE(0x88,0);
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FM_WRITE(0x8c,0);
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FM_WRITE(0xa4,0x0c); // frequency
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FM_WRITE(0xa0,0);
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FM_WRITE(0xb0,(params.alg&7)|((params.fb&7)<<3)); // ALG/FB
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FM_WRITE(0xb4,0xc0); // pan
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FM_WRITE(0x30,params.op[0].mult&15); // MULT
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FM_WRITE(0x34,params.op[1].mult&15);
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FM_WRITE(0x38,params.op[2].mult&15);
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FM_WRITE(0x3c,params.op[3].mult&15);
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FM_WRITE(0x40,params.op[0].tl&127); // TL
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FM_WRITE(0x44,params.op[1].tl&127);
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FM_WRITE(0x48,params.op[2].tl&127);
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FM_WRITE(0x4c,params.op[3].tl&127);
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FM_WRITE(0x28,0xf0); // key on
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// render
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for (int i=0; i<FM_PREVIEW_SIZE; i++) {
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aOut=0;
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for (int j=0; j<24; j++) {
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OPN2_Clock(&fm,out);
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}
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aOut+=fm.ch_out[0];
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if (aOut<-32768) aOut=-32768;
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if (aOut>32767) aOut=32767;
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fmPreview[i]=aOut;
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}
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}
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