glDetachShader — Detaches a shader object from a program object to which it is attached
void glDetachShader( | GLuint program, | 
GLuint shader); | 
programSpecifies the program object from which to detach the shader object.
shaderSpecifies the shader object to be detached.
glDetachShader detaches the shader
    object specified by shader from the
    program object specified by program. This
    command can be used to undo the effect of the command
    glAttachShader.
If shader has already been flagged
    for deletion by a call to
    glDeleteShader
    and it is not attached to any other program object, it will be
    deleted after it has been detached.
GL_INVALID_VALUE is generated if either
    program or shader
    is a value that was not generated by OpenGL.
GL_INVALID_OPERATION is generated if
    program is not a program object.
GL_INVALID_OPERATION is generated if
    shader is not a shader object.
GL_INVALID_OPERATION is generated if
    shader is not attached to
    program.
glGetAttachedShaders with the handle of a valid program object
glGetShader
    with arguments shader and
    GL_DELETE_STATUS
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