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Quite often it's desirable to be able to multiply the current modelview matrix by an arbitrary matrix. Currently though you have to first explicitly call cogl_get_modelview_matrix to get the current modelview into a temporary variable, then you need to multiply it with your matrix using cogl_matrix_multiply and finally use cogl_set_modelview_matrix to make the result be the new modelview. This new convenience function lets more efficiently skip the first get and last set steps.