[GEM-dev] GemVertexBuffer + Shader

[j-p]

Ok figured it out - have a working link between shader and
gemvertexbuffer.  Will send a full 1st draft cpp/h sometime in next two
weeks hopefully.


On Wed, Aug 27, 2014 at 2:19 PM, j-p <jptrkz at gmail.com> wrote:

> (follow up)
>
> Below is the test setup for a user-defined attribute in
> gemvertexbuffer.cpp:
> (m_shader is the 5th vbo for test, attribute index is set to 0)
> (just for this test I have set the program parameter in
> "glBindAttribLocation" to "1" because of this output when a glsl_program is
> linked with vert/frag shaders for the first time:
> "[glsl_program]: linked shaders 4 2: 1")
>
> code:
>
> if(m_shader.render()) {
> glVertexAttribPointer(0, 4, GL_FLOAT, GL_FALSE, 0, 0);     // index, size,
> etc etc
> glEnableVertexAttribArray(0);    // index
> glBindAttribLocation(1, 0, "gemAttrib1");       // program, index,
> attribute
> }
>
> I use "gemAttrib1" to set the fragColor but it's not working.
>
> vert file:
>
> attribute vec4 gemAttrib1;
> varying vec4 color1;
>
> void main()
> {
>    color1 = gemAttrib1;
>    gl_Position = ftransform();
> }
>
> frag file:
>
> varying vec4 color1;
> void main()
> {
> gl_FragColor = color1;
> }
>
>
>
> On Tue, Aug 26, 2014 at 11:48 PM, j-p <jptrkz at gmail.com> wrote:
>
>> Had a dummy vec4 using glVertexAttribPointer ready to test before
>> realizing there's no way to send the values over to the shader without the
>> "program" parameter.  Could the right outlet of glsl_program (the one that
>> sends out the ID number) work for this?
>>
>>
>> On Mon, Aug 25, 2014 at 11:23 AM, Jack <jack at rybn.org> wrote:
>>
>>>  Would be very nice !
>>> ++
>>>
>>> Jack
>>>
>>>
>>>
>>> Le 25/08/2014 17:10, IOhannes m zmölnig a écrit :
>>>
>>> On 08/25/2014 03:49 PM, j-p wrote:
>>>
>>>   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.
>>>
>>>  yes, that would be great.
>>>
>>> gfmadsr
>>> IOhannes
>>>
>>>
>>>
>>>
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>>
>
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