[PD] GEM: multitexturing in GEM

[chris clepper]

I would be curious to know what Josh/c74 have to say.  This is probably a
very minor issue that requires a little research and testing to fix.

On 7/6/07, vade <doktorp at mac.com> wrote:
>
> Chris, thanks very much for looking into this. Im very curious why the
> GLSL shaders work in Jitter, and even more so why they do not work in Apples
> shader builder. Thats very interesting... as the code im using is pretty
> straightforward (although I agree slightly ackward in specifics)
> If it would be in any way helpful, would you want me to ask specific
> questions to the Jitter devs regarding their implementation and any work
> arounds ? Id be more than happy to act as an interface, im sure they would
> be happy to help if they can. Apologies if that is an awkward request, im
> just trying to expedite a solution.
>
> Thanks again for taking the time to check this out.
>
> On Jul 5, 2007, at 10:11 PM, chris clepper wrote:
>
> I managed to take a look at GLSL and multi-texturing for a few minutes.
> Here's what I found:
>
> 1) ARB_fragment works exactly as expected with multiple texture units in
> GEM
> 2) GLSL does not work with the same GL setup commands in GEM
> 3) Apple's ShaderBuilder does not work with Anton's shader nor any example
> shaders I tried with multiple textures
> 4) Shader builder works exactly as expected using ARB_fragment
>
> This is with a G5 and Nvidia GPU.  I won't get back to this until Monday,
> but I suspect that some setup calls need to be updated or changed to match
> what the drivers want in order to access multiple textures.
>
> For what it's worth, I only use ARB_fragment shaders in my own work.
> They seem to work better and more efficiently.  I can post some shaders next
> week if anyone is interested.
>
> On 7/5/07, vade <doktorp at mac.com> wrote:
> >
> >  sorry. let me clarify. long work day does not make me clear.
> > switching texunit switches the textures. however, mixing only occurs
> > between unit 0 and unit 0. Not between unit 0 and 1.
> >
> > this is with Cyrille's patch.
> >
> > Thanks.
> >
> >
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