[GEM-dev] GemVertexBuffer + Shader

[j-p]

Here is a working example.  If it succeeds, you should see four quads with
unique shader qualities.

I'm happy with the design but it needs further changes - for example - I
was unable to build a class object array without errors at the constructor
stage.  Right now there are 5 fixed vbos added for attributes - enough for
the demo.

Also I think "uniform" types should be added.



On Thu, Aug 28, 2014 at 1:57 PM, j-p <jptrkz at gmail.com> wrote:

> 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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>>>
>>
>
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