[glewpy-users] glUniform1fARB bug?

[Simon W. <sim...@gm...>]

My vertex shader:

uniform float xtime;
void main(void) {
    vec4 v = vec4(gl_Vertex);
    float t;
    t = xtime;
    gl_Position = gl_ModelViewProjectionMatrix * v;
}

This shader compiles and links without errors.

glGetActiveUniformARB(vs.program, 1)

returns (1, 5126, 'xtime')

ptr = glGetUniformLocationARB(vs.program, 'xtime')

returns 1

glUniform1fARB(ptr, 5.0)

returns None, and I then get a GL_ERROR from glGetError().

Help! What am I doing wrong, or is this a bug?