LLE Graphic Features

Libretro Cores
#1

Hi everyone,

I just wanted to ask a question concerning a topic where I don’t find a concrete answer. It is about LLE emulation. Especially about the approach to emulate the GPU of certain consoles on the host GPU with vulkan compute shaders.

The benefit of HLE was to add easily certain features like upscaling, texture filtering, texture replacement, AA etc with the functions of the host GPU (OpenGL features). However accuracy was always a steuggle to achieve.

With the vulkan compute shader approach to emulate the GPU with LLE the accuracy highly improved (Parallel RDP, Parallel GS, Xemu etc).

Now this is the question: is it also possible to add features like texture filtering, texture replacement, AA with LLE?

Normally LLE means to „replicate“ the functions of the hardware as close as possible, which automatically excludes enhancement features. But with recent development achiements like Parallel GS or XEMU, upscaling is already possible. So would it be also possible to add other features which became pretty popular in the recent years (texture filtering or texture replacement).

I am asking because I am really curious about the possibilities with vulkan compute shader. So it would be great if someone could help here.

#2

You have to consider there are 2 layers in emulation :

  • the emulation of the components
  • the rendering

Generally, when you speak about LLE vs HLE, it only concerns the emulation of the components. I don’t think there is a rule preventing the rendering part to include optional enhancements. Compute shaders from both vulkan and opengl have been used for such enhancements in several emulators.

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#3

Thanks a lot for explaining. :grinning: That’s the answer I was looking for.

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