glDeleteShader — delete a shader object
glDeleteShader frees the memory and invalidates the name associated with the shader object specified by
shader. This command effectively undoes the effects of a call to glCreateShader.
If a shader object to be deleted is attached to a program object, it will be flagged for deletion, but it will not be deleted until it is no longer attached to any program object, for any rendering context (i.e., it must be detached from wherever it was attached before it will be deleted). A value of 0 for
shader will be silently ignored.
To determine whether an object has been flagged for deletion, call glGetShaderiv with arguments
glGetAttachedShaders with the program object to be queried
glGetShaderiv with arguments
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