HI Gerrick,
I have only drivers so I'll go get the latest and hope that they don't
break anything else along the way.
Cheers,
Robert.
On 5/31/07, Gerrick Bivins <[EMAIL PROTECTED]> wrote:
Hi Robert,
We have done this in our app and used the section of the code that you have
in the #else section
without problems EXCEPT we had to use beta drivers on linux (RHEL_4 at the
time) for a while. This was probably up until around Jan/Feb when nvidia
released new drivers. Now things are working fine with the lastest released
drivers.
The only difference we have in our code is that we multiply
gl_TexCoord[*] by gl_TextureMatrix[*]
{
...
gl_TexCoord[1].s = dot(ecPosition, gl_EyePlaneS[1]);
gl_TexCoord[1].t = dot(ecPosition, gl_EyePlaneT[1]);
gl_TexCoord[1].p = 0.0; // dot(ecPosition, gl_EyePlaneR[1]);
gl_TexCoord[1].q = 1.0; //dot(ecPosition, gl_EyePlaneQ[1]);
gl_TexCoord[1]*=gl_TextureMatrix[1];
...
}
but if that's identity in your case, you shouldn't have to do this.
biv
On 5/31/07, Robert Osfield <[EMAIL PROTECTED]> wrote:
>
> Hi All,
>
> Today I've trying to get a GLSL program to generate tex coords in the
> same way as non shader texgen works. I've read up the orange book on
> the topic, and also searched the web for inspriation, and what I've
> written look like should work, but it doesn't :-|
>
> The vertex program I've kept simple so far and looks like
>
> void main (void)
> {
> gl_Position = ftransform();
> gl_FrontColor = vec4(1.0,1.0,1.0,1.0);
> gl_TexCoord[0] = gl_MultiTexCoord0;
>
> vec4 ecPosition = gl_ModelViewMatrix*gl_Vertex;
>
> #if 1
> gl_TexCoord[1] = ecPosition * mat4(gl_EyePlaneS[1],
> gl_EyePlaneT[1],
> gl_EyePlaneR[1],
> gl_EyePlaneQ[1]);
>
> gl_TexCoord[1].p = 0.0;
> gl_TexCoord[1].q = 1.0;
> #else
>
> gl_TexCoord[1].s = dot(ecPosition, gl_EyePlaneS[1]);
> gl_TexCoord[1].t = dot(ecPosition, gl_EyePlaneT[1]);
> gl_TexCoord[1].p = 0.0; // dot(ecPosition, gl_EyePlaneR[1]);
> gl_TexCoord[1].q = 1.0; //dot(ecPosition, gl_EyePlaneQ[1]);
>
> #endif
> // gl_TexCoord[1] = gl_MultiTexCoord0;
> }
>
>
> The two parts of the #if #else #endif work identically, if I comment
> out the resetting og the p and q values I have what I think is correct
> code, but the generated tex coords are clearly wrong as I don't any
> valid texture being accessed. By adding the p and q setting in I do
> at least get half sensible values, but there still are not correct as
> distortion occurs as I change the eye point.
>
> glxinfo gives me:
>
> OpenGL vendor string: NVIDIA Corporation
> OpenGL renderer string: GeForce 7800 GT/PCI/SSE2
> OpenGL version string: 2.0.2 NVIDIA 87.62
>
>
> I am not setting the fragment program yet, so it should be the
> standard OpenGL fixed function pipeline for the shader.
>
> Any ideas?
> Robert.
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>
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