commit c439eb6dbe25514158c8c5d22f025da6bfe99601
author Sam Lantinga <slouken@libsdl.org> Thu Jan 14 14:42:53 2021 -0800
committer Sam Lantinga <slouken@libsdl.org> Thu Jan 14 14:42:53 2021 -0800
tree 13f85b20dbb0cd06df26165c8885a1191d7f4666
parent 087679a8fce824b3bb6d77fbf09555c76fb69fcc

Fixed bug 5451 - Can't create EGLSurface in Wayland from SDLWindow (no EGLNativeWindow pointer)

sashikknox

In some cases, need create EGLWindow with SDLWindow. In X11 i can get pointer to NativeWindow from **struct SDL_SysWMinfo wmInfo**
```C++
struct SDL_SysWMinfo wmInfo;
SDL_GetWindowWMInfo(ptSDLWindow, &wmInfo)
#if defined(__unix__) && defined(SDL_VIDEO_DRIVER_X11)
nativeWindow=(EGLNativeWindowType)wmInfo.info.x11.window;
nativeDisplay=(EGLNativeDisplayType)wmInfo.info.x11.display;
#endif
```
than i can create EGLSurface
```
eglCreateWindowSurface(nativeDisplay, EGL_CONFIG, nativeWindow, SURFACE_ATTRIBUTES);
```
in Wayland i can do it with same way, just need pointer to **EGLWindow**, we already have pointer to **wl_display** from **SDL_sysWMInfo**, need add to **wl** struct in SDL_SysWMInfo another pointer to **struct wl_egl_window *egl_window;**. And in wayland backend, in function **Wayland_GetWindowWMInfo** return pointer to **egl_window** from **SDL_WindowData**
Now i use patched statically built SDL2 in port of Quake 2 GLES2 for SailfishOS (it use QtWayland):
link to SDL2 commit and changed string for patch:
- https://github.com/savegame/lp-public/commit/6858a618cd179b766fe3cab36055f07cb03ad0ea
- https://github.com/savegame/lp-public/blob/b1e29e87b9d15780e47f04918b329ac15554fc69/SDL2/src/video/wayland/SDL_waylandwindow.c#L463

link to use in Quake2 port:
1. here i get pointer to EGLNativeWindowType:  https://github.com/savegame/lp-public/blob/6d94fedb1b720da24999ae6286a1809cd3d55ff5/Engine/Sources/Compatibility/OpenGLES/EGLWrapper.c#L319
2. then use it for create EGLSurface: https://github.com/savegame/lp-public/blob/6d94fedb1b720da24999ae6286a1809cd3d55ff5/Engine/Sources/Compatibility/OpenGLES/EGLWrapper.c#L391