Add SDL backend - Githubissues

cschreib / lxgui

Portable, real time, modular and data-driven GUI C++ library.

https://cschreib.github.io/lxgui

MIT License

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Add SDL backend #51

Closed cschreib closed 3 years ago

cschreib commented 3 years ago

SDL is a fairly standard and widely supported rendering/input backend. Adding an SDL backend to lxgui would increase the number of projects that could use the library.

Differences with SFML:

SDL is written in C, so I will likely have to write more boilerplate to get it all working, unless I use something like https://github.com/libSDL2pp/libSDL2pp? But then it has to be inter-operable with pure SDL, in case users use their C API or another C++ wrapper.
SDL has support for WebAssembly / emscripten, which is really good for demos and getting people engaged.

cschreib commented 3 years ago

Work started in https://github.com/cschreib/lxgui/tree/sdl-backend

cschreib commented 3 years ago

Input backend is now working. Working on renderer backend now.

cschreib commented 3 years ago

Renderer backend almost fully working, still need to figure out these things:

fine tune the pre-multiplied alpha blending, which doesn't look quite right yet.
add ad-hoc support for rotated textures (edge textures in particular)
add support for simple color gradients

cschreib commented 3 years ago

Color gradients are now working.

cschreib commented 3 years ago

Rotated textures and texture repeat are now working (with a slight implementation issue in texture repeat).

cschreib commented 3 years ago

Pre-multiplied alpha blending is now fixed.

cschreib commented 3 years ago

Work merged into master.