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Applications supporting DirectX 9 and 10

I have a noobish question for any graphic programmer.

I'm confused, how can some games (like Crysis) support both DirectX 9 (in XP) and 10 (in Vista)?

As far as I understand, if you are writing a DX10 application, it can only work in Vista.

Maybe they have 2 code bases - one written in DX9 and the other in DX10? But isn't that an excess?

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3 answers

They have two rendering pipelines: one uses DX9 calls and one uses DX10 calls. The APIs are incompatible, although most game engines can be reused. If you need open source examples on how various rendering pipelines are executed, take a look at something like Ogre3d that supports OpenGL, DX9, and (soon) DX10 rendering.

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I assume that their abstraction is very close to the DirectX level and simply provides the DX9 with reasonable manual implementations of the DX10 functions or improves the DX9 logic when running on the DX10.

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Source: https://habr.com/ru/post/1696894/

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