Vertex Shader trouble

Question

I'm having trouble getting my vertex shader (1.20) to work. I'm rendering a simple white triangle, but when I load the vertex shader the triangle disappears.

void main()
{
    gl_Position = gl_ModelViewProjectionMatrix * gl_Vertex;
}

I've also tried:

void main()
{
    gl_Position = ftransform();
}

to no avail. I'm really confused because my fragment shader does work. For example,

void main()
{
    gl_FragColor = vec4(.5, .6, .3, 1);
}

will turn my triangle green. I can't spot anything wrong (and the shaders compile without errors), so I'm wondering if anyone has any ideas.

You should show the code you're using to compile and link your shaders and programs. — Nicol Bolas

Ben Jackson Ben Jackson · Accepted Answer · 2012-02-04T23:45:01

I think you need to copy color and texture information as well:

            gl_FrontColor = gl_Color;
            gl_TexCoord[0] = gl_TextureMatrix[0] * gl_MultiTexCoord0;

(and much more if you intend to emulate all of the behavior of the fixed function pipeline)

Vertex Shader trouble

1 Answers