GLSL Problems on Radeon cards

Graphics and GPU Programming Programming

Started by Mekanikles February 21, 2008 04:58 PM

3 comments, last by Mekanikles 16 years, 2 months ago

139

Author

February 21, 2008 04:58 PM

Hi, me and my friend have come across a very strange problem. It seems that, for us anyway, GLSL cannot utilize simple variables under Radeon cards (9800 and x1650 confirmed). If we set a local variable X to, say 1, reading it on the next line results in a 0; For example:


vec4 diffuseLighting(int X) {
	return gl_LightSource[X].diffuse;
}

void main()
{
	gl_FragColor = diffuseLighting(1);
}

This code allways displays the diffuse color for LIGHT0. If we, however, change the X to a 1 to directly access LIGHT1 then it works. Could this be a version or a driver problem? Or is GLSL poorly supported on Radeon cards? Any help would be greatly appreciated. Thnx /Mekanikles EDIT: Confirmed that it works on Nvidia cards. [Edited by - Mekanikles on February 22, 2008 4:49:33 AM]

Krohm

5,051

February 22, 2008 01:54 AM

You mean that it always index light 0 in the example above?

Previously "Krohm"

Mekanikles

139

Author

February 22, 2008 04:48 AM

yes, variables allways reads as 0 regardless of what I set them to, in this case, it means that LIGHT0 is allways indexed.

V-man

813

February 22, 2008 07:20 PM

It's a known bug.

Sig: http://glhlib.sourceforge.net
an open source GLU replacement library. Much more modern than GLU.
float matrix[16], inverse_matrix[16];
glhLoadIdentityf2(matrix);
glhTranslatef2(matrix, 0.0, 0.0, 5.0);
glhRotateAboutXf2(matrix, angleInRadians);
glhScalef2(matrix, 1.0, 1.0, -1.0);
glhQuickInvertMatrixf2(matrix, inverse_matrix);
glUniformMatrix4fv(uniformLocation1, 1, FALSE, matrix);
glUniformMatrix4fv(uniformLocation2, 1, FALSE, inverse_matrix);

Mekanikles

139

Author

February 23, 2008 04:14 AM

Um, ok? Is there a solution then?

GLSL Problems on Radeon cards

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GLSL Problems on Radeon cards

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