[PD] GEM: multitexturing in GEM

[chris clepper]

CVS is updated.  Hopefully this won't break anyone's compiles.

The attached files are a test patch and the shaders.  I will be out of
town for a few days and not able to work on this again until next
week.

On 7/12/07, chris clepper <cgclepper at gmail.com> wrote:
> I have multitexturing working with GLSL.  While I upload the changes
> to CVS I can explain how it works.
>
> GLSL shaders cannot directly talk to hardware like ARB ones can.  The
> application side code has to tell the shader which hardware texture
> unit to use.  Obviously when I compile GEM there is no way in hell to
> know what the shader variables are going to be named, so another
> method to tell the shader which unit to use needs to be in place.
>
> One solution is to hardcode the names of the sampler variables, but
> that is kind of a hack.  The one I put in place uses a message to the
> glsl_program object with the name of the sampler and the texture unit
> to use.
>
> How to use:
>
> 1) create gemwin and turn on rendering
> 2) load shader
> 3) send a [mySamplerName $1( message to glsl_program
> 4) load two movies or images
> 5) set one of the pix_texture units to upload to the same texture unit
> you told the shader to use with a [texunit $1( message
>
> This change should be in CVS soon.  I will post an example patch in a bit.

>
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