Disabling GLSL

OpenGL
1

I have searched for a couple hours now and haven’t found the answer so maybe someone here knows :slight_smile:

Is there a way to disable GLSL shaders and drop the application back into the FFP after using one with a call to glUseProgramObjectARB()?

It would be great if there was something similar to the ARB vertex program extension where you can do:

GLboolean glPrev;
glGetBooleanv( GL_VERTEX_PROGRAM_ARB, &glPrev );

prev = ( glPrev != 0 );

// if the desired mode is not already on
if( prev != enable ) {

	// set it to the desired mode
	if( enable ) {

		glEnable( GL_VERTEX_PROGRAM_ARB );
	}
	else {

		glDisable( GL_VERTEX_PROGRAM_ARB );
	}

	_vertexProgramsOn = enable;
}

Worst comes to worst I could recreate the fixed-function pipeline in a shader but that seems unnecessary to me.

2

glUseProgramObject(0) will switch you back to the fixed function pipeline.

3

ah simple and elegant as I hoped for… thank you very much

4

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