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The GLFW Wayland drag-and-drop crash fix (previous commit) did NOT resolve
drag-and-drop on the real target (labwc), so abandon the GLFW path entirely
instead of patching it further.
Why SDL: raylib ships a first-class SDL backend (PLATFORM_DESKTOP_SDL) that
implements file drop via SDL_DROPFILE. GLFW 3.4 (vendored in raylib 6.0) has
broken Wayland drag-and-drop (wl_data_offer NULL source_actions/action
listeners -> libwayland wl_abort on drag, glfw/glfw#2835) AND its X11 backend
segfaults on WSLg (Mesa GLX). SDL's window/EGL/drag-drop is mature on BOTH
real Wayland (labwc) and WSLg, so one backend covers both targets with no
vendor patches and no X11/Wayland special-casing.
Changes (desktop only; web build stays Emscripten+GLFW, untouched):
- build.zig: build raylib PLATFORM=PLATFORM_DESKTOP_SDL (SDL_INCLUDE_PATH/
LIBRARY_PATH = system SDL2); link SDL2 instead of wayland-*/xkbcommon/EGL.
- Revert the GLFW patch (patches/glfw-wayland-dnd-crash.patch removed; the
build.zig patch-application step removed).
- Docs: environment.md / study-player.md / BUILDING.md / SCREENSHOT.md updated
to reflect the SDL backend + the SDL2 system dependency.
The RmlUi binding is backend-agnostic (rlgl render + raylib IsKeyDown input,
zero glfw* calls), so the swap is transparent to it.
Prerequisite on the cyberdeck: install SDL2 dev (sudo pacman -S sdl2 or
sdl2-compat) before building.
Verified on the laptop (WSLg): build green; binary runs under SDL
(Platform backend: DESKTOP (SDL)), window opens, no GLX segfault, RmlUi fonts
load, mp3 loads from argv (132300 frames), no crash. Interactive drag-drop
itself still needs user testing on the cyberdeck (SDL_DROPFILE path).
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