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GUI: prepare for FM preview

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tildearrow 2023-03-17 19:12:09 -05:00
parent d58270efed
commit 57f4cc8561
4 changed files with 101 additions and 0 deletions
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src/gui/fmPreview.cpp Normal file
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/**
* Furnace Tracker - multi-system chiptune tracker
* Copyright (C) 2021-2023 tildearrow and contributors
*
* This program is free software; you can redistribute it and/or modify
* it under the terms of the GNU General Public License as published by
* the Free Software Foundation; either version 2 of the License, or
* (at your option) any later version.
*
* 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 General Public License for more details.
*
* You should have received a copy of the GNU General Public License along
* with this program; if not, write to the Free Software Foundation, Inc.,
* 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA.
*/
#define _USE_MATH_DEFINES
#include "gui.h"
#include "../../extern/opn/ym3438.h"
#define FM_WRITE(addr,val) \
OPN2_Write(&fm,0,(addr)); \
do { \
OPN2_Clock(&fm,out); \
} while (fm.write_busy); \
OPN2_Write(&fm,1,(val)); \
do { \
OPN2_Clock(&fm,out); \
} while (fm.write_busy); \
void FurnaceGUI::renderFMPreview(const DivInstrumentFM& params, int pos) {
ym3438_t fm;
short out[2];
int aOut=0;
OPN2_Reset(&fm);
OPN2_SetChipType(&fm,ym3438_mode_opn);
// set params
FM_WRITE(0x50,31); // AR
FM_WRITE(0x54,31);
FM_WRITE(0x58,31);
FM_WRITE(0x5c,31);
FM_WRITE(0x60,0); // DR
FM_WRITE(0x64,0);
FM_WRITE(0x68,0);
FM_WRITE(0x6c,0);
FM_WRITE(0x70,0); // D2R
FM_WRITE(0x74,0);
FM_WRITE(0x78,0);
FM_WRITE(0x7c,0);
FM_WRITE(0x80,0); // SL/RR
FM_WRITE(0x84,0);
FM_WRITE(0x88,0);
FM_WRITE(0x8c,0);
FM_WRITE(0xa4,0x0c); // frequency
FM_WRITE(0xa0,0);
FM_WRITE(0xb0,(params.alg&7)|((params.fb&7)<<3)); // ALG/FB
FM_WRITE(0xb4,0xc0); // pan
FM_WRITE(0x30,params.op[0].mult&15); // MULT
FM_WRITE(0x34,params.op[1].mult&15);
FM_WRITE(0x38,params.op[2].mult&15);
FM_WRITE(0x3c,params.op[3].mult&15);
FM_WRITE(0x40,params.op[0].tl&127); // TL
FM_WRITE(0x44,params.op[1].tl&127);
FM_WRITE(0x48,params.op[2].tl&127);
FM_WRITE(0x4c,params.op[3].tl&127);
FM_WRITE(0x28,0xf0); // key on
// render
for (int i=0; i<FM_PREVIEW_SIZE; i++) {
aOut=0;
for (int j=0; j<24; j++) {
OPN2_Clock(&fm,out);
}
aOut+=fm.ch_out[0];
if (aOut<-32768) aOut=-32768;
if (aOut>32767) aOut=32767;
fmPreview[i]=aOut;
}
}