AMD, Intel, and Nvidia: Who supports what? That’s how games like Civilization V were able to run in either DX11 or DX9 modes from a common code base. A DirectX 11 GPU with feature level 9_3 couldn’t magically perform DirectX 11 effects, but it could run games in DirectX 9 mode without the developer needing to write an entirely separate engine implementation to allow for it.
The purpose of the feature level function is to allow developers to target a single API rather than developing separate code bases in parallel to ensure that a game can run smoothly on multiple generations of GPU hardware rather than writing separate code for DX12, DX11, DX10, and so on.
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It wasn’t a significant enough update to define an entirely new version of DirectX around it, but it was a large enough step to warrant its own extension. DirectX 10.1, for example, implemented new standards for visual quality, new shader instructions, and support for cube map arrays. A point update (DirectX 10.1, DirectX 11.1 / 11.2) is an additional set of standardized capabilities that allow developers to perform certain tasks more efficiently or offer specific capabilities. The first thing to understand is that DirectX feature levels aren’t the same thing as DirectX point updates. DirectX feature levels and point updates are not the same thing In reality, Intel, Nvidia, and AMD all support DirectX 12 at various feature levels, and no GPU on the market today supports every single optional DirectX 12 capability. This has been spun into allegations that AMD doesn’t support “full” DirectX 12. The current confusion seems to have been caused by comments from AMD’s Robert Hallock, who acknowledged that the various AMD GCN-class GPUs support different feature levels of DirectX 12. Recently, however, there’s been some confusion over what level of support Intel, AMD, and Nvidia will offer for the new API and which products will run the upcoming games that rely on it. For more than a year, AMD and Nvidia have been advertising that various older GPU families would support DirectX 12 at launch.
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Now that Windows 10 is finally shipping, the question of DirectX compatibility is going to move from a marketing bullet point to a tangible issue for users.
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