New noise shaders

> Yet another version of a Tweak OpenGL player.  From the package  
> comments:
> -----
> Filename: Tweak-OpenGL-daf.9.mcz
> Timestamp: 31 July 2007 9:38:22 pm
> Message: Make some noise! (with a few more shaders.)
>
> Requires the OpenGL-OpenGL package from the PublicContribs repository
> to be installed first. It is necessary to manually do "OGLExtManager
> initialize" after loading the OpenGL-OpenGL package.
>
> The newest OpenGL package from the Hedgehog repository should also be
> merged. Thanks to Andreas Raab for a big performance boost.
>
> This package also depends on a fix for Mantis #6553, which can
> temporarily be a trivial do-it-yourself thing. Just change
> VectorColor#asVector4 so that it returns a Vector4 instance instead of
> a Vector3.
>
> Install the 3 packages, do the 2 manual items above, then in Squeak
> open a Tweak Project Window, get a Workspace from the Tools menu,
> enter "GPUInfo new chkGLSLSupport" and doIt. If this says that you
> have GLSL support, then enter "Wrinkle1 open" and doIt.
> -----
> Although the random generator for the noise shaders isn't the best (I
> didn't fully implement the pseudo-random algorithm because I didn't
> take the time to figure out how to mathematically do the bit-level
> operations), it will do for now.  Though now I have enough shaders to
> make it interesting to attempt to combine multiple textures!  Here's
> hoping I don't run into too many GPU limitations right off the bat ...
>
> Here are some very interesting free texture tools:
> http://www.artofillusion.org/docs/texedtut/chapter9
> http://www.werkkzeug.com/
> http://www.mentalimages.com/2_4_mentalmill/index.html

> Hey David,
>
> I'm trying to get your noise fragment shader to work and I'm running
> into a couple of issues on this Radeon x1600 Mac 10.4.10 hardware/
> driver combo and I'm hitting a few issues.
>
> Three issues actually, two of them are just places where integer and
> floating point conversion should be occurring (eg float(anInt)) which
> is no problem, but the bigger one is it complains about the massive
> numbers (when it comes to integers my card/driver combo can support
> nothing over 65535, and you've got some numbers in the billions!).
> Can smaller numbers work?  And what hardware are you running on
> (assuming you're running on hardware)?
>
> Cheers,
> Derek
>
> On Aug 1, 2007, at 10:25 AM, David Faught wrote:
>
> > Yet another version of a Tweak OpenGL player.  From the package
> > comments:
> > -----
> > Filename: Tweak-OpenGL-daf.9.mcz
> > Timestamp: 31 July 2007 9:38:22 pm
> > Message: Make some noise! (with a few more shaders.)
> >
> > Requires the OpenGL-OpenGL package from the PublicContribs repository
> > to be installed first. It is necessary to manually do "OGLExtManager
> > initialize" after loading the OpenGL-OpenGL package.
> >
> > The newest OpenGL package from the Hedgehog repository should also be
> > merged. Thanks to Andreas Raab for a big performance boost.
> >
> > This package also depends on a fix for Mantis #6553, which can
> > temporarily be a trivial do-it-yourself thing. Just change
> > VectorColor#asVector4 so that it returns a Vector4 instance instead of
> > a Vector3.
> >
> > Install the 3 packages, do the 2 manual items above, then in Squeak
> > open a Tweak Project Window, get a Workspace from the Tools menu,
> > enter "GPUInfo new chkGLSLSupport" and doIt. If this says that you
> > have GLSL support, then enter "Wrinkle1 open" and doIt.
> > -----
> > Although the random generator for the noise shaders isn't the best (I
> > didn't fully implement the pseudo-random algorithm because I didn't
> > take the time to figure out how to mathematically do the bit-level
> > operations), it will do for now.  Though now I have enough shaders to
> > make it interesting to attempt to combine multiple textures!  Here's
> > hoping I don't run into too many GPU limitations right off the bat ...
> >
> > Here are some very interesting free texture tools:
> > http://www.artofillusion.org/docs/texedtut/chapter9
> > http://www.werkkzeug.com/
> > http://www.mentalimages.com/2_4_mentalmill/index.html
>
>

>
> Actually, the whole idea of doing the PRNG in the shader is not the
> "usual thing".  Most shader noise implementations generate random
> numbers outside of the shader and store them in a texture which is
> then accessed by the shader.  I've been thinking about implementing
> another noise shader based directly on Ken Perlin's Java reference
> implementation, which has the random numbers statically stored in an
> array in the code.  The size of the array is kind of limiting though.
> The lack of bit-level operations in the (NVidia?) GLSL code is another
> big limitation on doing PRNG things directly in the shader.
>
> I guess I need to try a few other alternatives ...

>
> Dave
>
> On 8/1/07, Derek Arndt <[hidden email]> wrote:
>> Hey David,
>>
>> I'm trying to get your noise fragment shader to work and I'm running
>> into a couple of issues on this Radeon x1600 Mac 10.4.10 hardware/
>> driver combo and I'm hitting a few issues.
>>
>> Three issues actually, two of them are just places where integer and
>> floating point conversion should be occurring (eg float(anInt)) which
>> is no problem, but the bigger one is it complains about the massive
>> numbers (when it comes to integers my card/driver combo can support
>> nothing over 65535, and you've got some numbers in the billions!).
>> Can smaller numbers work?  And what hardware are you running on
>> (assuming you're running on hardware)?
>>
>> Cheers,
>> Derek
>>
>> On Aug 1, 2007, at 10:25 AM, David Faught wrote:
>>
>>> Yet another version of a Tweak OpenGL player.  From the package
>>> comments:
>>> -----
>>> Filename: Tweak-OpenGL-daf.9.mcz
>>> Timestamp: 31 July 2007 9:38:22 pm
>>> Message: Make some noise! (with a few more shaders.)
>>>
>>> Requires the OpenGL-OpenGL package from the PublicContribs  
>>> repository
>>> to be installed first. It is necessary to manually do "OGLExtManager
>>> initialize" after loading the OpenGL-OpenGL package.
>>>
>>> The newest OpenGL package from the Hedgehog repository should  
>>> also be
>>> merged. Thanks to Andreas Raab for a big performance boost.
>>>
>>> This package also depends on a fix for Mantis #6553, which can
>>> temporarily be a trivial do-it-yourself thing. Just change
>>> VectorColor#asVector4 so that it returns a Vector4 instance  
>>> instead of
>>> a Vector3.
>>>
>>> Install the 3 packages, do the 2 manual items above, then in Squeak
>>> open a Tweak Project Window, get a Workspace from the Tools menu,
>>> enter "GPUInfo new chkGLSLSupport" and doIt. If this says that you
>>> have GLSL support, then enter "Wrinkle1 open" and doIt.
>>> -----
>>> Although the random generator for the noise shaders isn't the  
>>> best (I
>>> didn't fully implement the pseudo-random algorithm because I didn't
>>> take the time to figure out how to mathematically do the bit-level
>>> operations), it will do for now.  Though now I have enough  
>>> shaders to
>>> make it interesting to attempt to combine multiple textures!  Here's
>>> hoping I don't run into too many GPU limitations right off the  
>>> bat ...
>>>
>>> Here are some very interesting free texture tools:
>>> http://www.artofillusion.org/docs/texedtut/chapter9
>>> http://www.werkkzeug.com/
>>> http://www.mentalimages.com/2_4_mentalmill/index.html
>>
>>