Somewhat weird problem with GL shader compiler

Graphics and GPU Programming Programming

Started by goodperiodical February 19, 2008 07:45 PM

1 comment, last by goodperiodical 16 years, 2 months ago

128

Author

February 19, 2008 07:45 PM

I verified that both the vertex and fragment shader in the program are functioning but glGetUniformLocation is still returning -1 for uniform variables that were working 10 minutes ago. I don't think I altered any related code and there are no compile or link errors.

uniform vec3 LightPosition;//vertex header
int pnt = glGetUniformLocation(shaderProgram[0], "LightPosition");//source

Pretty straight forward I think.

burgrlovr

122

February 19, 2008 07:51 PM

What does the shader look like? If the variable doesn't get used then it won't be included when the shader is compiled.

goodperiodical

128

Author

February 19, 2008 08:07 PM

Wow, I must have missed that. So every time I comment out my luminance color fragment adjustment, the compiler traces that back to the vertex shader and removes the uniform variable input. Thanks for the response.