SDL2's SDL_Surface CPU rasterizer/backend

[momo-AUX1]

This PR adds the SDL Render CPU rasterizer support, useful platforms that dont expose a Renderer/GPU abstraction or projects such as bochs that use the blitzer.

[ocornut]

Hello,
Why closing this ?

[momo-AUX1]

I tried testing it on bochs and I saw some artifacting I thought it was a code issue but it worked

[momo-AUX1]

I will reopen

[ocornut]

Hello,

I believe it would be too difficult for me to reliably maintain/support this in an official manner.
Particularly as a software rasterizer may be further optimizer and this seems currently far from peek performance.

I think it is a valuable project, how about you host this on your own repository and we can add all links from Wiki?
e.g. I suggest your repository can mimic imgui structures:

backends/imgui_impl_sdlsurface2.cpp, h
examples/example_sdl2_surface/main.cpp

Since your code was already well design to "blend in" imgui habits (thanks for that!) it would be easy for anyone to import those files.

Linking to other software renderers:
https://github.com/ocornut/imgui/wiki/Bindings#Software-RenderersRasterizers

[momo-AUX1]

hello,

yes of course I'd love that, thank you !

[ocornut]

Great! I'll wait for your signal/url and then will add links from all suitable wiki/docs locations.

[momo-AUX1]

https://github.com/momo-AUX1/imgui/tree/sdl_cpu

here is the url this one includes perf fixes and a new SDL3 surface tested on macOS and the web

[ocornut]

To augment discovery and updates here are my suggestion:

• this should be a new repository called e.g. momo-AUX1/imgui_impl_sdlsurface
• and only contains the new files (examples/ + backends/ files)
• being a new repository, the changes to imgui_examples.sln, docs/BACKENDS.md, docs/EXAMPLES.md unfortunately cannot be included (*).

But I think overall this would make it more attractive and easy for people to use this, and update may be carried without confusion.

What do you think?

[momo-AUX1]

Of course I'll do this tonight thank you for your help and review !

[momo-AUX1]

https://github.com/momo-AUX1/imgui_impl_sdlsurface

here it is !