[PD] 3 1/2 shaders help!

marius schebella marius.schebella at gmail.com
Wed Nov 7 03:39:41 CET 2007

well, as soon as you try to use gl_MultiTexCoord1, it does not work 
anymore. I think using gl_MultiTexCoord0 sometimes works, even with 
images of different sizes, but for example the lumaglyph does not work 
without gl_MultiTexCoord1. I don't know how the information can be 
passed from gemstate.

vade wrote:
> if that is the issue, then it should (?) work for sampler2D and 
> texture2D, but I thought we had tested that the other night at the 
> Patching Circle and found it to not work?
> ill write a simple shader shortly using square textures as inputs and we 
> can test the theory out.
> On Nov 6, 2007, at 9:13 PM, marius schebella wrote:
>> yes, I was referring to cyrille's mail
>> http://lists.puredata.info/pipermail/pd-list/2007-07/052026.html
>> but that is already included in the current version.
>> also, this mail seems to be related to the problem
>> http://lists.puredata.info/pipermail/gem-dev/2007-08/002873.html
>> marius.
>> vade wrote:
>>> Hi.
>>> I was working a bit with Marius on porting the shaders, and would love
>>> to figure out the issues with multitexturing with GLSL programs. If a
>>> developer (chris?) would be kind enough to point me in the right
>>> direction...
>>> Marius mentioned an email a while ago pointing out a typo in a GEM c
>>> file. Reports indicated that fixing this typo resolved multitexturing
>>> issues. Marius checked the latest GEM builds included with Extended
>>> (0.4.xxx), which do include the fix for the typo (i rather than 1),
>>> however neither of us seem to be making any leeway wrt multitexturing.
>>> Id love any pointers.
>>> Thanks,
>>> On Nov 4, 2007, at 7:38 PM, marius schebella wrote:
>>>> hey,
>>>> I was working on shaders recently and put some stuff online
>>>> http://www.parasitaere-kapazitaeten.net/Pd/4shaders
>>>> shader #3 is the most advanced, uses a normal map texture.
>>>> but I am still running into problems when using multiple shaders. the
>>>> problem (again) is, that gl_MultiTexCoords1 does not get the correct
>>>> values passed from GEM.
>>>> so the 4th shader should use two images of different sizes, but I only
>>>> got it working very rudimentary. If anyone can help me with this, it
>>>> would solve a very big problem! (chris?)
>>>> Thanks to vade so far for his support!
>>>> marius.
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