void glDeleteShader(GLuint shader);
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 glGetShader() with arguments shader and GL_DELETE_STATUS.
glGetShader() with arguments shader and GL_DELETE_STATUS
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