return the address of the specified generic vertex attribute pointer
glGetVertexAttribPointerv returns pointer information. index is the generic vertex attribute to be queried, pname is a symbolic constant indicating the pointer to be returned, and params is a pointer to a location in which to place the returned data.
The state returned is retrieved from the currently bound vertex array object.
The initial value for each pointer is 0.
GL_INVALID_OPERATION is generated if no vertex array object is currently bound.
GL_INVALID_VALUE is generated if index is greater than or equal to GL_MAX_VERTEX_ATTRIBS .
GL_INVALID_ENUM is generated if pname is not an accepted value.
glGet with argument GL_MAX_VERTEX_ATTRIBS
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