[Mesa-dev] mis-counting varying vars in the linker

[Brian Paul]

I think the linker is mis-counting gl_TexCoord[] varying vars when 
linking.

For example, if we have this vertex/fragment shader combination:

// vs
void main()
{
     gl_Position = ftransform();
     gl_TexCoord[6] = gl_MultiTexCoord[0];
}

// fs
void main()
{
     gl_Color = gl_TexCoord[6];
}


the varying_vectors counter in assign_varying_locations() will be 7, 
not 1.  It seems the gl_TexCoord var is being seen as an array of 7 
elements and we're counting the whole array rather than the individual 
elements used.

This is causing a link failure in an app here because the vs/fs shader 
pair uses several user-defined varying vars plus gl_TexCoord[4].  The 
varying count exceeds GL_MAX_VARYING_FLOATS even though we're really 
not using that many varying slots.

-Brian