[help OpenGL]

[gta]

Hi,

I had some free time to play with OpenGL again.

I'm using the work branch of the banthar bindings.

Following this thread I changed the gl.Init function to

func Init() GLenum {

    C.glewExperimental=C.GL_TRUE

    return GLenum(C.glewInit())

}

so the attached code compiles and run but does not display anything.

Anyone knows what am i doing wrong?

Thanks.

[Jonathan Wills]

Well depending on your graphics card the fact that you don't set 

  gl_ClipVertex = gl_ModelViewMatrix * gl_Vertex;

in your fragment shader might be a problem.  I don't see anything else that immediately jumps out at me though.

[Jonathan Wills]

On Fri, Jun 29, 2012 at 11:49 AM, Jonathan Wills <runni...@gmail.com> wrote:

Well depending on your graphics card the fact that you don't set 

  gl_ClipVertex = gl_ModelViewMatrix * gl_Vertex;

in your fragment shader might be a problem.  I don't see anything else that immediately jumps out at me though.

 

I meant vertex shader, not fragment shader.

[gta]

Thanks for the reply (and sorry for my late one),

I tried to add that line but I got the following errors:

ERROR: 0:6: Use of undeclared identifier 'gl_ClipVertex'

ERROR: 0:6: Use of undeclared identifier 'gl_ModelViewMatrix'

ERROR: 0:6: Use of undeclared identifier 'gl_Vertex'

I guess because I'm trying to use #version 330

Any other idea?

Thanks in advance.

Giacomo

[Christoph Schunk]

 gl_ModelViewMatrix is deprecated.  With OpenGL 3 you have to handle the matrices yourself (via Uniforms). Have a look at GLM http://glm.g-truc.net/ for an OpenGL compatible matrix implementation. You could port the matrix stuff to Go.

[gta]

Hi,

and thanks for the link.

I think this is basically what I was trying to learn from the tutorial I linked in the first post, but I get only a blank window. 

I can change the clear color but anything drawn with the shader is not displayed, and being a total n00b I have no clue on what can possibly be wrong (I was expecting a more evident reason of failure, compilers screaming in pain and what not).

Is it possible that the problem is compiling a shader with #version 330 in an OpenGL 3.2 context? 

How is it even possible anyways?

Giacomo