[GEM-dev] GemVertexBuffer + Shader

[j-p]

Yah it's really only 2 values for UV.  In error I was referring to my
project - 8 is the total for the 4 sets composing a quad.  Looks like it
will be constricting either way... and then in other cases
pos/tex/color/normal will all be needed.  I think at some point I'll
attempt a mod for gemvertexbuffer to add user-defined attributes that can
be passed to the vertex-shader.

On Mon, Aug 25, 2014 at 5:56 AM, Jack <jack at rybn.org> wrote:

>  Le 24/08/2014 22:52, j-p a écrit :
>
>  Right - attribute not uniform.  The texture table is a good candidate
> for non-texture VBOs - 8 parameters from the UV coordinates.  Otherwise
> probably the color table? (4) - as color is usually determined in the
> shader or from the texture itself?
>
>
> If you want to use texcoord from table, according to the help file about
> [gemvertexbuffer], you can send only 2 values : textureU and textureV. With
> color from table you can send 4 values (R G B A). Color can be determined
> in the shader, and you can get it with gl_Color (vec4 for R G B A). But
> maybe i don't understand your last question correctly ?
> ++
>
> Jack
>
>
>
>
>
>
> On Sun, Aug 24, 2014 at 4:22 PM, Jack <jack at rybn.org> wrote:
>
>>  Le 24/08/2014 21:55, j-p a écrit :
>>
>>  Hi,
>> I'm trying to find a way to get each vertex in a VBO to send individual
>> uniform values to a connected shader.  I was thinking it might be possible
>> to send these through an unused table... or maybe a 5th table could be
>> created (length given with msg) to be referenced by the shaders?
>>
>> I have no idea is this is practical or possible within GEM setup, but if
>> it is - any interest in adding this function?
>>
>>
>>  _______________________________________________
>> GEM-dev mailing listGEM-dev at lists.iem.athttp://lists.puredata.info/listinfo/gem-dev
>>
>>  Hello,
>>
>> You can't pass individual uniform values to each vertex.
>> I guess you try to pass individual values to each vertex. For this
>> purpose, you can use attribute variables.
>> You are limited with the VBO object of Gem to use "build-in" vertex
>> attributes : position, color, texture, normal.
>> If you want to pass individual values to vertex, use one of this
>> "build-in" vertex attribute that you don't use and get the attribute in
>> your vertex shader.
>> ++
>>
>> Jack
>>
>>
>>
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>
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