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GNU GENERAL PUBLIC LICENSE
Version 2, June 1991
Copyright (C) 1989, 1991 Free Software Foundation, Inc.
59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
Everyone is permitted to copy and distribute verbatim copies
of this license document, but changing it is not allowed.
Preamble
The licenses for most software are designed to take away your
freedom to share and change it. By contrast, the GNU General Public
License is intended to guarantee your freedom to share and change free
software--to make sure the software is free for all its users. This
General Public License applies to most of the Free Software
Foundation's software and to any other program whose authors commit to
using it. (Some other Free Software Foundation software is covered by
the GNU Library General Public License instead.) You can apply it to
your programs, too.
When we speak of free software, we are referring to freedom, not
price. Our General Public Licenses are designed to make sure that you
have the freedom to distribute copies of free software (and charge for
this service if you wish), that you receive source code or can get it
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To protect your rights, we need to make restrictions that forbid
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For example, if you distribute copies of such a program, whether
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We protect your rights with two steps: (1) copyright the software, and
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GNU GENERAL PUBLIC LICENSE
TERMS AND CONDITIONS FOR COPYING, DISTRIBUTION AND MODIFICATION
0. This License applies to any program or other work which contains
a notice placed by the copyright holder saying it may be distributed
under the terms of this General Public License. The "Program", below,
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that is to say, a work containing the Program or a portion of it,
either verbatim or with modifications and/or translated into another
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the term "modification".) Each licensee is addressed as "you".
Activities other than copying, distribution and modification are not
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is covered only if its contents constitute a work based on the
Program (independent of having been made by running the Program).
Whether that is true depends on what the Program does.
1. You may copy and distribute verbatim copies of the Program's
source code as you receive it, in any medium, provided that you
conspicuously and appropriately publish on each copy an appropriate
copyright notice and disclaimer of warranty; keep intact all the
notices that refer to this License and to the absence of any warranty;
and give any other recipients of the Program a copy of this License
along with the Program.
You may charge a fee for the physical act of transferring a copy, and
you may at your option offer warranty protection in exchange for a fee.
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the Program is not required to print an announcement.)
These requirements apply to the modified work as a whole. If
identifiable sections of that work are not derived from the Program,
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through that system in reliance on consistent application of that
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This section is intended to make thoroughly clear what is believed to
be a consequence of the rest of this License.
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certain countries either by patents or by copyrighted interfaces, the
original copyright holder who places the Program under this License
may add an explicit geographical distribution limitation excluding
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countries not thus excluded. In such case, this License incorporates
the limitation as if written in the body of this License.
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of the General Public License from time to time. Such new versions will
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address new problems or concerns.
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either of that version or of any later version published by the Free
Software Foundation. If the Program does not specify a version number of
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Foundation.
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to ask for permission. For software which is copyrighted by the Free
Software Foundation, write to the Free Software Foundation; we sometimes
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of preserving the free status of all derivatives of our free software and
of promoting the sharing and reuse of software generally.
NO WARRANTY
11. BECAUSE THE PROGRAM IS LICENSED FREE OF CHARGE, THERE IS NO WARRANTY
FOR THE PROGRAM, TO THE EXTENT PERMITTED BY APPLICABLE LAW. EXCEPT WHEN
OTHERWISE STATED IN WRITING THE COPYRIGHT HOLDERS AND/OR OTHER PARTIES
PROVIDE THE PROGRAM "AS IS" WITHOUT WARRANTY OF ANY KIND, EITHER EXPRESSED
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PROGRAM PROVE DEFECTIVE, YOU ASSUME THE COST OF ALL NECESSARY SERVICING,
REPAIR OR CORRECTION.
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WILL ANY COPYRIGHT HOLDER, OR ANY OTHER PARTY WHO MAY MODIFY AND/OR
REDISTRIBUTE THE PROGRAM AS PERMITTED ABOVE, BE LIABLE TO YOU FOR DAMAGES,
INCLUDING ANY GENERAL, SPECIAL, INCIDENTAL OR CONSEQUENTIAL DAMAGES ARISING
OUT OF THE USE OR INABILITY TO USE THE PROGRAM (INCLUDING BUT NOT LIMITED
TO LOSS OF DATA OR DATA BEING RENDERED INACCURATE OR LOSSES SUSTAINED BY
YOU OR THIRD PARTIES OR A FAILURE OF THE PROGRAM TO OPERATE WITH ANY OTHER
PROGRAMS), EVEN IF SUCH HOLDER OR OTHER PARTY HAS BEEN ADVISED OF THE
POSSIBILITY OF SUCH DAMAGES.
END OF TERMS AND CONDITIONS
How to Apply These Terms to Your New Programs
If you develop a new program, and you want it to be of the greatest
possible use to the public, the best way to achieve this is to make it
free software which everyone can redistribute and change under these terms.
To do so, attach the following notices to the program. It is safest
to attach them to the start of each source file to most effectively
convey the exclusion of warranty; and each file should have at least
the "copyright" line and a pointer to where the full notice is found.
<one line to give the program's name and a brief idea of what it does.>
Copyright (C) <year> <name of author>
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., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
Also add information on how to contact you by electronic and paper mail.
If the program is interactive, make it output a short notice like this
when it starts in an interactive mode:
Gnomovision version 69, Copyright (C) year name of author
Gnomovision comes with ABSOLUTELY NO WARRANTY; for details type `show w'.
This is free software, and you are welcome to redistribute it
under certain conditions; type `show c' for details.
The hypothetical commands `show w' and `show c' should show the appropriate
parts of the General Public License. Of course, the commands you use may
be called something other than `show w' and `show c'; they could even be
mouse-clicks or menu items--whatever suits your program.
You should also get your employer (if you work as a programmer) or your
school, if any, to sign a "copyright disclaimer" for the program, if
necessary. Here is a sample; alter the names:
Yoyodyne, Inc., hereby disclaims all copyright interest in the program
`Gnomovision' (which makes passes at compilers) written by James Hacker.
<signature of Ty Coon>, 1 April 1989
Ty Coon, President of Vice
This General Public License does not permit incorporating your program into
proprietary programs. If your program is a subroutine library, you may
consider it more useful to permit linking proprietary applications with the
library. If this is what you want to do, use the GNU Library General
Public License instead of this License.

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js/dbopl.js
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var DBOPL = new function() { // DBOPL namespace
// dbopl.h
this.WAVE_HANDLER = 10;
this.WAVE_TABLELOG = 11;
this.WAVE_TABLEMUL = 12;
this.DBOPL_WAVE = this.WAVE_TABLEMUL;
this.SynthMode = {
sm2AM:0,
sm2FM:1,
sm3AM:2,
sm3FM:3,
sm4Start:4,
sm3FMFM:5,
sm3AMFM:6,
sm3FMAM:7,
sm3AMAM:8,
sm6Start:9,
sm2Percussion:10,
sm3Percussion:11,
};
this.SHIFT_KSLBASE = 16;
this.SHIFT_KEYCODE = 24;
this.Operator = function() {
// public:
// enum
this.MASK_KSR = 0x10;
this.MASK_SUSTAIN = 0x20;
this.MASK_VIBRATO = 0x40;
this.MASK_TREMOLO = 0x80;
this.State = { // typedef enum
OFF:0,
RELEASE:1,
SUSTAIN:2,
DECAY:3,
ATTACK:4,
};
this.volHandler=0;
this.waveBase=0;
this.waveMask=0;
this.waveStart=0;
this.waveIndex=0; //WAVE_BITS shifted counter of the frequency index
this.waveAdd=0; //The base frequency without vibrato
this.waveCurrent=0; //waveAdd + vibratao
this.chanData=0; //Frequency/octave and derived data coming from whatever channel controls this
this.freqMul=0; //Scale channel frequency with this, TODO maybe remove?
this.vibrato=0; //Scaled up vibrato strength
this.sustainLevel=0; //When stopping at sustain level stop here
this.totalLevel=0; //totalLevel is added to every generated volume
this.currentLevel=0; //totalLevel + tremolo
this.volume=0; //The currently active volume
this.attackAdd=0; //Timers for the different states of the envelope
this.decayAdd=0;
this.releaseAdd=0;
this.rateIndex=0; //Current position of the evenlope
this.rateZero=0; //Bits for the different states of the envelope having no changes
this.keyOn=0; //Bitmask of different values that can generate keyon
//Registers, also used to check for changes
this.reg20=0;
this.reg40=0;
this.reg60=0;
this.reg80=0;
this.regE0=0;
//Active part of the envelope we're in
this.state=0;
//0xff when tremolo is enabled
this.tremoloMask=0;
//Strength of the vibrato
this.vibStrength=0;
//Keep track of the calculated KSR so we can check for changes
this.ksr=0;
return this;
};
// dbopl.cpp (private stuff)
var ZeroArray = function(size) {
// http://stackoverflow.com/questions/1295584/most-efficient-way-to-create-a-zero-filled-javascript-array
return Array.apply(null, new Array(size)).map(Number.prototype.valueOf,0);
};
var PI = 3.14159265358979323846;
var OPLRATE = 14318180.0 / 288.0;
var TREMOLO_TABLE = 52;
var WAVE_BITS = 10;
var WAVE_SH = 32 - WAVE_BITS;
var WAVE_MASK = (1 << WAVE_SH) - 1;
var LFO_SH = WAVE_SH - 10;
var LFO_MAX = 256 << LFO_SH;
var ENV_BITS = 9;
var ENV_MIN = 0;
var ENV_EXTRA = ENV_BITS - 9;
var ENV_MAX = 511 << ENV_EXTRA;
var ENV_LIMIT = (12 * 256) >> (3 - ENV_EXTRA);
var ENV_SILENT = function(_X_) { return _X_ >= ENV_LIMIT; }
var RATE_SH = 24;
var RATE_MASK = (1 << RATE_SH ) - 1;
var MUL_SH = 16;
var KslCreateTable = [
64, 32, 24, 19,
16, 12, 11, 10,
8, 6, 5, 4,
3, 2, 1, 0,
];
var M = function(_X_) {return _X_ * 2};
var FreqCreateTable = [
M(0.5), M(1), M(2), M(3), M(4), M(5), M(6), M(7),
M(8), M(9), M(10), M(10), M(12), M(12), M(15), M(15),
];
var AttackSamplesTable = [
69, 55, 46, 40,
35, 29, 23, 20,
19, 15, 11, 10,
9
];
var EnvelopeIncreaseTable = [
4, 5, 6, 7,
8, 10, 12, 14,
16, 20, 24, 28,
32,
];
var WaveTable = ZeroArray(8 * 512);
var WaveBaseTable = [
0x000, 0x200, 0x200, 0x800,
0xa00, 0xc00, 0x100, 0x400,
];
var WaveMaskTable = [
1023, 1023, 511, 511,
1023, 1023, 512, 1023,
];
var WaveStartTable = [
512, 0, 0, 0,
0, 512, 512, 256,
];
var MulTable = ZeroArray(384);
var KslTable = ZeroArray(8 * 16);
var TremoloTable = ZeroArray(TREMOLO_TABLE);
var ChanOffsetTable = ZeroArray(32);
var OpOffsetTable = ZeroArray(64);
var VibratoTable = [
1 - 0x00, 0 - 0x00, 1 - 0x00, 30 - 0x00,
1 - 0x80, 0 - 0x80, 1 - 0x80, 30 - 0x80
];
// Note: the original used reference parameters to return index and shift..
function EnvelopeSelect(val) {
var shift, index;
if ( val < 13 * 4 ) { //Rate 0 - 12
shift = 12 - ( val >> 2 );
index = val & 3;
} else if ( val < 15 * 4 ) { //rate 13 - 14
shift = 0;
index = val - 12 * 4;
} else { //rate 15 and up
shift = 0;
index = 12;
}
return [index, shift];
}
}; // end of DBOPL namespace