glGetUniformLocation returns -1 for most uniforms

Normally, I use the proprietary nvidia GL driver to test my application,
but now that I use the mesa backend, for some reason, glGetUniformLocation
returns -1 on certain uniforms (for reasons I can't comprehend).

Here is part of my shader source:

uniform mat4 N_MVP;
uniform bool N_UV_flip;
uniform float N_UV_z;
uniform float N_alpha;
uniform bool N_3D;
uniform float N_time;
uniform float N_rand;

If I run glGetUniformLocation(shader->shader_handle, "N_rand"), it returns
-1. same for N_time, and N_UV_z. However, using the same code for N_alpha
returns 2.

This does not happen on the nvidia GL driver.

Any clues as to why? Source code is available here:
https://github.com/MiJyn/nightmare and
https://github.com/MiJyn/silentponyville .

-- 
Joel Leclerc
Individual software and game developer,
   Lead developer of the SythOS project.
Main email: [email protected] | Chat: [email protected]
Twitter: @__MiJyn__ <https://twitter.com/__MiJyn__> | Website:
http://mijyn.github.io/
Github: https://github.com/MiJyn

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