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Editorial Team
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Asked: 2026-05-31T08:29:57+00:00

Let’s say I have an OpenGL program that has a uniform attribute diffuseColor. I

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Let’s say I have an OpenGL program that has a uniform attribute “diffuseColor”. I have set it as following:

GLint location = glGetUniformLocation(handle, "diffuseColor");
glUniform3f(location, 1, 0, 0);

Now I would like to return it to the default value, which is encoded in the shader code. I do not have access to the source code, but I can call OpenGL API functions on the compiled program. Is there a way to read default value and set it with glUniform3f? Or even better, is there a something like glResetUniform3f(GLint loc)?

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1 Answer

  1. Editorial Team

    Uniform initializers are applied upon linking the program. The value can then be read using glGetUniformfv/glGetUniformiv. There is no way to read the initial value of the uniform after you changed the uniform value.

    There is no way to reset a single uniform to its initial value, but relinking the program will reset all uniforms in it. Linking a program is a costly operation and should be avoided in between frames.

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