OpenGL Shader error 1282

Question

I am trying to add lighting to my current scene of a simple cube. After setting up my uniforms I get a 1282 error from glGetError() for this piece of code

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Answer 1

Error number ´1282` is not very descriptive.

Possible error codes for glGetUniformLocation are:

GL_INVALID_VALUE
GL_INVALID_OPERATION

Which don't have a fixed value. Try to get the error string with gluErrorString() or take a look in the header to which of those 1282 maps.

Just a shot in the dark: but did you ...

• check your shader got compiled without error?

• check your shader got linked without error?

BTW: return type is GLint not GLuint

"Shaders compiled and linked without error" Hmm, this looks odd.

According to spec (see: http://www.opengl.org/sdk/docs/man/xhtml/glGetUniformLocation.xml) GL_INVALID_OPERATION should only be generated if:

• program is not a program objec

• program has not been successfully linked

Other question:

• are you sure the getHandle()method of the class your program Object belongs to returns the right id. I mean the one that was used in the sucessfully linking.

  you should be able to verify with checking if glIsProgram(program-getHandle()) returns GL_TRUE

EDIT: Ah - I missed those calls to glUniform4fv in your example.

Correct return type for glGetUniformLocation is still GLint, but I don't think thats the problem.

According to spec (see: http://www.opengl.org/sdk/docs/man/xhtml/glUniform.xml) GLUniformXX generates GL_INVALID_OPERATION for a whole bunch of reasons. To me the only one that possibly seems to apply is:

• there is no current program object

  Did you call glUseProgram (program->getHandle()) prior to trying to calling glUniform()?

Answer 2

Generally this error number occurs when you are using a different programID from the programID generated by openGL at the time of creating the shader. It means that you are using a different programID at the time of binding vertexShader or fragmentShader or whatever other shader you are using.