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Editorial Team
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Editorial Team
Asked: May 23, 20262026-05-23T06:06:25+00:00 2026-05-23T06:06:25+00:00

I have a shader that has the following uniform declared: uniform highp float fr;

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I have a shader that has the following uniform declared:

uniform highp float fr;

In my rendering method, it gets set accordingly:

GLfloat num = 1.0f;
glUniform1f(glGetUniformLocation(self.Program, "fr"), num);

But it doesn’t get set at all. These seems pretty basic so I can’t spot why it isn’t working.
Have I used the correct syntax?

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  1. Editorial Team
    Editorial Team
    2026-05-23T06:06:26+00:00Added an answer on May 23, 2026 at 6:06 am

    I have found my issue.

    I was setting the uniform before calling use program. For anyone that finds this answer, ensure you call use program before setting the uniform for that program.

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