I feel like more explaination is needed. I often see people wanting their favorite game from 2010-2015 remastered because it's "DX9", but there are different versions of DX9. And most games people want remastered are using DX 9.0c, which are games using Shader Model 3.0 and will never work unless they can be downgraded to work as Fixed Function Pipeline, like Fallout: New Vegas. The games using vanilla DX9.0 are very few, as that era of DX9 was short lived and the list of DX9.0b games is even smaller most of those use Shader Model 2.0. I have seen screenshots come by of OpenGL games such as Return to Castle Wolfenstein and American McGee's Alice, with the use of a OpenGL to DX9 wrapper. People really have to think games between 2000 and 2004, with some games outside of that era if the game engine is writen in such a way that it can be downgraded.

TheDeeGee:

I feel like more explaination is needed. I often see people wanting their favorite game from 2010-2015 remastered because it's "DX9", but there are different versions of DX9. And most games people want remastered are using DX 9.0c, which are games using Shader Model 3.0 and will never work unless they can be downgraded to work as Fixed Function Pipeline, like Fallout: New Vegas. The games using vanilla DX9.0 are very few, as that era of DX9 was short lived and the list of DX9.0b games is even smaller most of those use Shader Model 2.0. I have seen screenshots come by of OpenGL games such as Return to Castle Wolfenstein and American McGee's Alice, with the use of a OpenGL to DX9 wrapper. People really have to think games between 2000 and 2004, with some games outside of that era if the game engine is writen in such a way that it can be downgraded.

If you read the Compatibility page of the RTX Remix project's GITHub repository, it doesn't state that DX9 shader bases games would not be remixable, it just states that the tool can't handle scenes using pixel shaders automatically (yet?) and that there is some work in place for mesh shaders that look promising. It does state that a sufficiently capable and dedicated modder could rework the pixel shaders to work with RTX Remix, but that would fall outside the operating range of the tool (for now). They also state that it is not outside the realm of the possible that a future iteration of RTX Remix will actually be able to deal with pixel and mesh shaders automatically, but they expect that to take quite a bit of work. so TL;DR: current version of RTX Remix works best with fixed function pipeline based games, anything more advanced requires potentially a lot of manual rework of shader code.

I can see HL2 Remix not coming out until November as a 20th anniversary type of thing.