I'm not using Proton, but using regular Wine+dxvk (for DX11 games).
dxvk[1] is an amazing project (it's translating D3D11 → Vulkan). With Vulkan finally landing VK_EXT_transform_feedback[2] and Wine and dxvk using it (Mesa has it in master for radv, and there are patches for anv; Nvidia blob has it in beta), games like The Witcher 3 can be played on Linux perfectly, without graphics distortions.
dxvk[1] is an amazing project (it's translating D3D11 → Vulkan). With Vulkan finally landing VK_EXT_transform_feedback[2] and Wine and dxvk using it (Mesa has it in master for radv, and there are patches for anv; Nvidia blob has it in beta), games like The Witcher 3 can be played on Linux perfectly, without graphics distortions.
1. https://github.com/doitsujin/dxvk
2. http://jason-blog.jlekstrand.net/2018/10/transform-feedback-...