Expert Sleepers Spectral Conquest User Manual v1.0.0

Expert Sleepers
Spectral Conquest
v1.0.0
User Manual

Copyright © 2010 Expert Sleepers. All rights reserved.

This manual, as well as the software described in it, is furnished under licence and may be
used or copied only in accordance with the terms of such licence. The content of this man­ual is furnished for informational use only, is subject to change without notice, and should
not be construed as a commitment by Expert Sleepers. Expert Sleepers assumes no respon­sibility or liability for any errors or inaccuracies that may appear in this document.

THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EX­PRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF
MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGE­MENT. IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE
FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN ACTION OF
CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN CONNECTION
WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE.

Contents

Introduction! 6

Acknowledgements! 6

Installation! 7

Mac OS X, Audio Unit (AU)! 7
Mac OS X, VST! 7
Windows (VST)! 7

System Requirements! 7

Mac OS X! 7
Windows! 7

Registration! 8

Using Spectral Conquest! 9

Using the controls! 9

Knobs! 9
Value edit boxes! 9
Name/value display! 9

Overview! 10

Spectrum Plot! 10

View! 10

X/Y Axis! 10
Min/Max dB! 10
Min/Max Lin! 10
Smooth! 11

Process! 11

Input! 11
FFT Size! 11
Output! 11

Mix! 11

Dry! 11
Wet! 11

Buttons! 11

Script! 12

Script! 12
Run When! 12
Param 1-4! 12

Built-in Scripts! 12

Shift! 12
Reverse! 12
Low Pass! 12
High Pass! 12
Band Pass! 13
Gate! 13

Preferences! 14

OSC Base Port! 14
Eye candy! 14
Constant redraw! 14
Floating tooltip! 14

MIDI control! 15

OSC Control! 16

Reference! 16

MIDI & OSC Scripting! 16

Reference! 16

Script locations! 16

Spectral Scripting! 17

addSpectralScript( name, function )! 17
copyBin( from, to )! 17
multiplyBin( index, multiplier )! 17
swapBins( index1, index2 )! 18
getBin( index )! 18
setBin( index, re, im )! 18
getBinMagnitudeSqr( index )! 18
zeroBin( index )! 18

Built-in Scripts! 18

Version History! 21

Contact! 22

Acknowledgements! 23

Lua! 23

oscpack! 23

glew! 24

FreeType! 25

FTGL! 25

libpng! 25

zlib! 25

Introduction

Spectral Conquest is an effect plug-in that lets you directly manipulate the frequency

spectrum of audio signals.

The incoming signal is analysed via a FFT (Fast Fourier Transform), resulting in the famil­iar spectrum plot where the full audio spectrum is split into a number of narrow frequency
bands. The outgoing audio is then regenerated by an Inverse FFT. The interesting bit is
that the plug-in lets you modify the frequency spectrum in between.

Spectral Conquest allows you to modify the spectrum in two ways:

•

By setting a multiplier for each frequency band. You can simply draw out the multi­pliers in the GUI.

•

By applying a script to the spectrum. Some basic scripts are included with the plug­in to perform operations such as filtering and gating, but you can also write scripts
yourself to do whatever you like.

Acknowledgements

The underlying technique used by Spectral Conquest is based on the Cycling '74 Pluggo
effect ‘Spectral Filter’, itself based on work by Zack Settel and Cort Lippe.

Installation

Mac OS X, Audio Unit (AU)

The plug-in file is called ExSlSpectralConquest.component.

Simply copy the file to the folder:

Library/Audio/Plug-Ins/Components

Mac OS X, VST

The plug-in file is called ExSlSpectralConquest.vst.

Simply copy the file to the folder:

Library/Audio/Plug-Ins/VST

Windows (VST)

The plug-in file is called spectralconquest.dll.

Simply copy the file to your VST plug-ins folder.

System Requirements

Mac OS X

Spectral Conquest requires at least Mac OS X version 10.5.8. The plug-in is Intel-only, and
built for both 32 and 64 bit. The Audio Unit version will work in any Audio Unit host. The
VST version requires a “VST 2.4” compatible host.

1

Windows

Spectral Conquest has been developed and tested with Windows XP SP2. It may work
with other versions of Windows (Windows 7 included) but this is by no means guaran­teed. The plug-in requires a “VST 2.4” compatible host.

1

VST is a trademark of Steinberg Media Technologies GmbH.

Registration

The downloadable version of Spectral Conquest stops working after 15 minutes every time
you use it. To stop this happening, you need to buy a registration.

You can buy a registration key online using a credit card or PayPal from the Expert Sleep­ers Licence Manager application. See here for more information. Note that you need at
least version 1.0.16 of the Licence Manager.

The e-commerce side of things is handled by eSellerate. If you have any security concerns,
have a look at their website which is pretty informative.

Your registration key allows you to install Spectral Conquest on up to 3 different comput­ers (useful if for example you have a desktop computer in the studio and a laptop for live
use).

You need an internet connection to activate the software, though not necessarily on the
computer on which you want to use it.

Using Spectral Conquest

Using the controls

Knobs

Basic use of the knobs is to click on them and drag the mouse up and down.
However you can obtain different results by holding keys as follows:

•

Shift : Values change more slowly as you move the mouse.

•

Command1 (Mac OS X)/Alt (Windows) : The knob assumes its default po­sition.

•

Option2 (Mac OS X)/Control (Windows): The knob assumes integer values
only.

Value edit boxes

These boxes (below each knob) let you enter parameter values directly. Clicking on the
value highlights it in green - you can then type the desired value using the keyboard. Press
enter to finish and accept the new value.

While you’re typing the value, the box goes red to indicate that the value you see has not
yet been accepted.

Name/value display

As you move the mouse around the interface, the name and
current value of the control currently under the mouse is
displayed in the top right of the window. This area also pro­vides tool-tips for buttons.

1

The ‘Command’ key is also known as the ‘Apple’ key - the one next to the spacebar.

2

The ‘Option’ (alt) key is the one between the Control (ctrl) key and the Command (cmd) key.

Overview

Most of the plug-in GUI is devoted to the spectrum plot and the area that controls the fre­quency band or ‘bin’ multipliers. Below this is a row of controls, broken down into sec­tions. The ‘Process’ and ‘Mix’ sections control the basic audio processing. The ‘View’ sec­tion controls the appearance and behaviour of the spectrum plot. The ‘Script’ section con­trols the scripted functions. Above the spectrum plot is a row of buttons most of which
quickly set the bin levels to preset values.

Spectrum Plot

The upper half of the large graphical area in the middle of GUI shows the spectrum plot of
the incoming and outgoing audio. The solid rectangles show the incoming spectrum; the
small horizontal lines show the outgoing spectrum.

The lower half of this area shows the bin levels. It essentially consists of a very large num­ber of vertical sliders, one per bin in the spectrum. You can use each slider individually, or
you can draw large numbers of levels at once simply by ‘painting’ with the mouse.

You can restrict the mouse to adjust one level only, regardless of horizontal movement, by
holding Option1 (Mac OS X)/Control (Windows).

View

The View controls affect the
appearance and behaviour
of the spectrum plot.

X/Y Axis

These two drop-down
menus set whether the X
and Y axes of the spectrum
plot use Logarithmic or Linear scales.

Min/Max dB

When the Y axis is showing a logarithmic scale, these knobs set the range of values (in dB)
displayed.

Min/Max Lin

When the Y axis is showing a linear scale, these knobs set the range of values displayed.

1

The ‘Option’ (alt) key is the one between the Control (ctrl) key and the Command (cmd) key.

Smooth

The ‘Smooth’ knob controls the filtering of the spectrum display. Note that this affects the
visual appearance of the display only - it does not affect the audio processing in any way.

Process

The ‘Process’ section controls some fundamental as­pects of the audio processing.

Input

The ‘Input’ knob controls the gain applied to the signal
on the way in to the plug-in.

FFT Size

This drop-down menu controls the ‘size’ of the FFT algorithm applied, which relates to the
number of bins that the frequency spectrum is divided into.

Output

The ‘Output’ knob controls the gain applied to the signal on the way out of the plug-in.

Mix

Dry

Sets the level of the ‘dry’ (i.e. unprocessed) signal leaving the plug­in.

Wet

Sets the level of the ‘wet’ (i.e. processed) signal leaving the plug-in.

Buttons

The five but­tons above the
spectrum dis­play change
the bin levels in fairly self-explanatory ways.

Script

The ‘Script’ section offers con­trol over the scripted functions.

Script

This drop-down menu lets you
select a script to use, or ‘Off’ for
no script.

Run When

This drop-down menu lets you choose when the script is run - before or after the bin mul­tipliers have been applied.

Param 1-4

These knobs set the parameter values that are passed to the script. Their exact meaning
depends on the script chosen.

Built-in Scripts

The following scripts are defined by the plug-in itself. New scripts may be added by the
user - see below.

Shift

Shifts the values of bins up or down by a whole number of bins.

Param 1 sets the number of bins to shift by.

Reverse

Flips the bin levels horizontally i.e. low frequencies become high frequencies and vice
versa. Since this often results in unusably high frequencies, a bin shift is also applied.

Param 1 sets the number of bins to shift by.

Low Pass

A ‘brick wall’ low pass filter. All bins above a certain point are set to zero.

Param 2 sets the filter frequency.

High Pass

A ‘brick wall’ high pass filter. All bins below a certain point are set to zero.

Param 2 sets the filter frequency.

Band Pass

A band pass filter. Bin levels are faded off around a centre frequency.

Param 2 sets the filter centre frequency.
Param 3 sets the falloff rate.

Gate

A gating effect. Depending on a mode setting, each bin level is set to zero if it is either be­low or above a certain threshold level.

Param 2 sets the threshold level.
Param 3 sets the mode. If it is zero, a bin is set to zero unless its level is above the thresh­old; if it is non-zero, a bin is set to zero unless its level is below the threshold.

Preferences

Pressing the ‘Prefs’ button brings up a dialog where various preferences
are set. These settings are shared by all instances of Spectral Conquest,
and are not stored with presets.

The top section shows the product version.

The central section will show your serial number once you’ve bought a registration.

OSC Base Port

Sets the base port number for OSC. See the section on OSC, below.

Eye candy

Enables the pretty graphics. Turn off if you don’t like them, or if your computer has com­patibility issues with drawing such things.

Constant redraw

Is on by default. If turned off, the GUI is only redrawn when a control changes. Use this if
you’re concerned that the GUI is wasting your CPU resources.

Floating tooltip

Causes the parameter name and value display (usually in the top right of the GUI) to be
displayed above the mouse pointer.

MIDI control

All of Spectral Conquest’s parameters can be controlled via MIDI CC’s (Continuous Con­trollers) according to the table below.

0! OSC Port Offset
2! Dry Level
3! Wet Level
4! FFT Size
5! View X Axis
8! View Y Axis
9! View Min dB
11! View Max dB
12! View Min Linear
13! View Max Linear
14! View Smoothing
15! Input Gain
16! Output Gain
17! Script Index
18! Script Position
19! Scripted 1
20! Scripted 2
21! Scripted 3
22! Scripted 4

OSC Control

Spectral Conquest can be controlled via the Open Sound Control (OSC) protocol.

If you’re new to OSC, start by visiting opensoundcontrol.org.

Two settings control what port the plug-in uses to listen on for OSC com­mands. One is the base OSC port, set in the preferences. The second is the
OSC Port Offset control. If the port offset is set to something other than
‘Off’, then the two numbers are added together and the result used as the
port number. E.g. if the base port is 6000 and the port offset is 1, then the
plug-in will listen on port 6001.

Reference

All Expert Sleepers plug-ins that support OSC share a common implementation. This is
documented in the ‘OSC Control Manual’, available from the Expert Sleepers website.

MIDI & OSC Scripting

It is possible to extend the plug-in’s MIDI & OSC functionality via user-writeable scripts.
Indeed, the standard MIDI functionality described above has been re-implemented using
such a script, which you can use as reference for your customisations.

The language used for the MIDI scripts is Lua. You will find a complete description of the
language, and some useful tutorials, at the Lua website: www.lua.org

All the standard language features of Lua are available in the scripts, plus some extra func­tions specific to the Expert Sleepers system.

Reference

All Expert Sleepers plug-ins that support MIDI/OSC scripting share a common implemen­tation. This is documented in a the ‘MIDI & OSC Scripting Manual’, available from the
Expert Sleepers website.

Script locations

The plug-in name for constructing the script locations is ‘Spectral Conquest‘.

Spectral Scripting

The scripts that are available via the ‘Script’ controls as described above are defined in ex­actly the same way as the MIDI/OSC scripts. Please review the ‘MIDI & OSC Scripting
Manual’ for details.

In addition to the functions defined for MIDI control, Spectral Conquest defines the fol­lowing functions for writing scripts to process the spectrum.

addSpectralScript( name, function )

This is the main function that lets you add a new script to the range available. Simply call
it in the main body of your Lua file.

E.g.

local function scriptedShift( state )
!-- etc.
end
addSpectralScript( "Shift", scriptedShift )

The first argument is the name of the script to display in the plug-in GUI. The second is
the function to process the spectrum.

The function passed to addSpectralScript() should accept one argument, which is a state
table, used to pass various information from the plug-in to the script. The members of the
state table are:

state.maxBin - the maximum bin index i.e. the bins are numbered from 0 to state.maxBin.
state.param1/2/3/4 - the four parameter values as set by the GUI.

A complete function might look like this (which is the plug-in’s built-in Low Pass Filter
script):

local function scriptedBrickWallLPF( state )

!local maxBin = state.maxBin
!local cutoff = state.param2 * maxBin
!local setBin = setBin
!for i=cutoff,maxBin,1 do
!!setBin( i, 0, 0 )
!end

end

copyBin( from, to )

Copies the value of bin index ‘from’ to bin index ‘to’.

multiplyBin( index, multiplier )

Multiplies the value of bin ‘index’ by ‘multiplier’.

swapBins( index1, index2 )

Swaps the values of bin ‘index1’ with bin ‘index2’.

getBin( index )

Returns the value of bin ‘index’. The bin values are complex numbers, represented by a
pair of values. E.g.

local re, im = getBin( i )

setBin( index, re, im )

Sets the value of bin ‘index’ to the complex number represented by the pair of values ‘re’
and ‘im’.

getBinMagnitudeSqr( index )

Returns the square of the magnitude of bin ‘index’.

zeroBin( index )

Sets the value of bin ‘index’ to zero.

Built-in Scripts

The full text of the plug-in’s built-in scripts is included below for reference.

-- define spectral scripts

local function scriptedShift( state )

!local shift = state.param1
!local maxBin = state.maxBin
!local copyBin = copyBin
!local zeroBin = zeroBin
!if shift > 0 then
!!for i=maxBin,shift,-1 do
!!!copyBin( i-shift, i )
!!end
!!for i=shift-1,0,-1 do
!!!zeroBin( i )
!!end
!elseif shift < 0 then
!!for i=0,maxBin+shift,1 do
!!!copyBin( i-shift, i )
!!end
!!for i=maxBin+shift+1,maxBin,1 do
!!!zeroBin( i )
!!end
!end

end

local function scriptedReverse( state )

!local maxBin = state.maxBin

!local swapBins = swapBins
!for i=0,(maxBin-1)/2,1 do
!!swapBins( i, maxBin-i )
!end
!local shift = state.param1
!state.param1 = shift - (maxBin-1)*3/4
!scriptedShift( state )
!state.param1 = shift

end

local function scriptedBrickWallLPF( state )

!local maxBin = state.maxBin
!local cutoff = state.param2 * maxBin
!local setBin = setBin
!for i=cutoff,maxBin,1 do
!!setBin( i, 0, 0 )
!end

end

local function scriptedBrickWallHPF( state )

!local maxBin = state.maxBin
!local cutoff = state.param2 * maxBin
!local setBin = setBin
!for i=0,cutoff,1 do
!!setBin( i, 0, 0 )
!end

end

local function scriptedBPF( state )

!local maxBin = state.maxBin
!local cutoff = state.param2 * maxBin
!local depth = state.param3 ^ 2
!if depth <= 0 then return end
!local multiplyBin = multiplyBin
!for i=0,cutoff,1 do
!!local factor = 1 - ( cutoff - i ) * depth
!!if factor < 0 then factor = 0 end
!!multiplyBin( i, factor )
!!-- equivalently
!!-- local re, im = getBin( i )
!!-- setBin( i, re * factor, im * factor )
!end
!for i=cutoff,maxBin,1 do
!!local factor = 1 - ( i - cutoff ) * depth
!!if factor < 0 then factor = 0 end
!!multiplyBin( i, factor )
!!-- equivalently
!!-- local re, im = getBin( i )
!!-- setBin( i, re * factor, im * factor )
!end

end

local function scriptedGate( state )

!local maxBin = state.maxBin
!local threshold = state.param2
!local magnitude = 0
!local getBinMagnitudeSqr = getBinMagnitudeSqr
!local zeroBin = zeroBin
!threshold = threshold * (maxBin-1) / 32

!threshold = threshold ^ 2
!if state.param3 > 0 then
!!for i=0,maxBin,1 do
!!!magnitude = getBinMagnitudeSqr( i )
!!!if magnitude > threshold then
!!!!zeroBin( i )
!!!end
!!end
!else
!!for i=0,maxBin,1 do
!!!magnitude = getBinMagnitudeSqr( i )
!!!if magnitude < threshold then
!!!!zeroBin( i )
!!!end
!!end
!end

end

-- add the scripts

addSpectralScript( "Shift", scriptedShift )
addSpectralScript( "Reverse", scriptedReverse )
addSpectralScript( "Low Pass", scriptedBrickWallLPF )
addSpectralScript( "High Pass", scriptedBrickWallHPF )
addSpectralScript( "Band Pass", scriptedBPF )
addSpectralScript( "Gate", scriptedGate )

Version History

1.0.0 1/7/2010

•

First release.

!

Contact

The Expert Sleepers website is here:

http://www.expert-sleepers.co.uk/

Or you can email

[e-mail]

Or you can use the forum, which is here:

http://www.kvraudio.com/forum/viewforum.php?f=85

Acknowledgements

The software described in this manual makes use of the following open source projects.
The author is greatly indebted to them for their efforts and generosity.

Below are reproduced the various copyright notices and disclaimers that accompany these
software projects, in accordance with their terms of use.

Lua

Copyright (C) 1994-2008 Lua.org, PUC-Rio.

Permission is hereby granted, free of charge, to any person obtaining a copy of this
software and associated documentation files (the "Software"), to deal in the Software
without restriction, including without limitation the rights to use, copy, modify,
merge, publish, distribute, sublicense, and/or sell copies of the Software, and to per­mit persons to whom the Software is furnished to do so, subject to the following con­ditions:

The above copyright notice and this permission notice shall be included in all copies
or substantial portions of the Software.

THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND,

EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES
OF MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT
SHALL THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABIL­ITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN CON­NECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE.

oscpack

oscpack -- Open Sound Control packet manipulation library

http://www.audiomulch.com/~rossb/code/oscpack

Copyright (c) 2004 Ross Bencina <[e-mail]>

Permission is hereby granted, free of charge, to any person obtaining a copy of this software and associated documenta­tion files (the "Software"), to deal in the Software without restriction, including without limitation the rights to use, copy,
modify, merge, publish, distribute, sublicense, and/or sell copies of the Software, and to permit persons to whom the
Software is furnished to do so, subject to the following conditions:

The above copyright notice and this permission notice shall be included in all copies or substantial portions of the Soft­ware.

Any person wishing to distribute modifications to the Software is requested to send the modifications to the original
developer so that they can be incorporated into the canonical version.

THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR IMPLIED, INCLUD­ING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE
AND NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR
ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHER­WISE, ARISING FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS
IN THE SOFTWARE.

glew

The OpenGL Extension Wrangler Library
Copyright (C) 2002-2007, Milan Ikits <milan ikits[]ieee org>
Copyright (C) 2002-2007, Marcelo E. Magallon <mmagallo[]debian org>
Copyright (C) 2002, Lev Povalahev
All rights reserved.

Redistribution and use in source and binary forms, with or without modification, are permitted provided that the follow­ing conditions are met:

* Redistributions of source code must retain the above copyright notice, this list of conditions and the following dis­claimer.

* Redistributions in binary form must reproduce the above copyright notice, this list of conditions and the following dis­claimer in the documentation and/or other materials provided with the distribution.

* The name of the author may be used to endorse or promote products derived from this software without specific prior
written permission.

THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS" AND ANY EXPRESS
OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANT­ABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPY­RIGHT OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEM­PLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE
GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED
AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING
NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED
OF THE POSSIBILITY OF SUCH DAMAGE.

Mesa 3-D graphics library

Version: 7.0

Copyright (C) 1999-2007 Brian Paul All Rights Reserved.

Permission is hereby granted, free of charge, to any person obtaining a copy of this software and associated documenta­tion files (the "Software"), to deal in the Software without restriction, including without limitation the rights to use, copy,
modify, merge, publish, distribute, sublicense, and/or sell copies of the Software, and to permit persons to whom the
Software is furnished to do so, subject to the following conditions:

The above copyright notice and this permission notice shall be included in all copies or substantial portions of the Soft­ware.

THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR IMPLIED, INCLUD­ING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE
AND NONINFRINGEMENT. IN NO EVENT SHALL BRIAN PAUL BE LIABLE FOR ANY CLAIM, DAMAGES OR
OTHER LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF
OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE.

Copyright (c) 2007 The Khronos Group Inc.

Permission is hereby granted, free of charge, to any person obtaining a copy of this software and/or associated docu­mentation files (the "Materials"), to deal in the Materials without restriction, including without limitation the rights to
use, copy, modify, merge, publish, distribute, sublicense, and/or sell copies of the Materials, and to permit persons to
whom the Materials are furnished to do so, subject to the following conditions:

The above copyright notice and this permission notice shall be included in all copies or substantial portions of the Mate­rials.

THE MATERIALS ARE PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR IMPLIED, IN­CLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY, FITNESS FOR A PARTICULAR

PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS BE LI­ABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR
OTHERWISE, ARISING FROM, OUT OF OR IN CONNECTION WITH THE MATERIALS OR THE USE OR OTHER
DEALINGS IN THE MATERIALS.

FreeType

The FreeType Project is copyright (C) 1996-2000 by David Turner, Robert Wilhelm, and Werner Lemberg.

THE FREETYPE PROJECT IS PROVIDED `AS IS' WITHOUT WARRANTY OF ANY KIND, EITHER EXPRESS OR IM­PLIED, INCLUDING, BUT NOT LIMITED TO, WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A
PARTICULAR PURPOSE. IN NO EVENT WILL ANY OF THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE
FOR ANY DAMAGES CAUSED BY THE USE OR THE INABILITY TO USE, OF THE FREETYPE PROJECT.

FTGL

Copyright (C) 2001-3 Henry Maddocks

Permission is hereby granted, free of charge, to any person obtaining a copy of this software and associated documenta­tion files (the "Software"), to deal in the Software without restriction, including without limitation the rights to use, copy,
modify, merge, publish, distribute, sublicense, and/or sell copies of the Software, and to permit persons to whom the
Software is furnished to do so, subject to the following conditions:

The above copyright notice and this permission notice shall be included in all copies or substantial portions of the Soft­ware.

THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR IMPLIED, INCLUD­ING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE
AND NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR
ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHER­WISE, ARISING FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS
IN THE SOFTWARE.

libpng

http://www.libpng.org/pub/png/libpng.html

zlib

http://www.zlib.net/