Currently the distribution of the samples is random. That means the quality of the resulting image depends on the random number genererator. If you want to make sure that the samples are equally distributed, you have to use a predifined set of sample points. Here are the patterns which are used in DirectX for example: D3D11_STANDARD_MULTISAMPLE_QUALITY_LEVELS (d3d11.h) - Win32 apps | Microsoft Docs