The greatest failure is that to this day DirectX is still supreme for developers targeting non-console operating systems. Over three years since Steam came to Linux, combined with the knowledge of iOS and Android using OpenGL, and every game for Windows is still shipping DirectX 11 and some are supporting DX12 and less than a half dozen meaningful titles support Vulkan.
If Valve had succeeded we would be seeing day one cross platform titles being released with a single graphics backend written in OpenGL rather than farmed out ports that perform at up to half the speed of the original Windows development.
If Valve had succeeded we would be seeing day one cross platform titles being released with a single graphics backend written in OpenGL rather than farmed out ports that perform at up to half the speed of the original Windows development.
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