This is the gbm frontend used by (for example) weston compositor to
load the GLES stack, and retrieve the backing buffer objects behind
an eglImage (created with EGL_WAYLAND_BUFFER_WL), etc.
The frontend is really just a backend loader and shim. The backend
library must be provided by the GLES implementation.
To get wayland up and running on your GLES stack:
1) implement gbm backend
2) implement EGL_WL_bind_wayland_display extension (including
EGL_WAYLAND_BUFFER_WL eglCreateImageKHR target
for compositor-drm it looks like we also need
EGL_KHR_surfaceless_gles2 extension..
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<robclark> hmm, I don't suppose there is any extension description for EGL_KHR_surfaceless_gles2 ?
<pq> robclark, it should simply mean you can eglMakeCurrent with NULL surface, but a real context.
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3) implement wayland-egl (must provide wayland-egl.pc)
4) ???
5) PROFIT!!
need this in your eglext.h:
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#ifndef EGL_WL_bind_wayland_display
#define EGL_WL_bind_wayland_display 1
#define EGL_WAYLAND_BUFFER_WL 0x31D5 /* eglCreateImageKHR target */
struct wl_display;
#ifdef EGL_EGLEXT_PROTOTYPES
EGLAPI EGLBoolean EGLAPIENTRY eglBindWaylandDisplayWL(EGLDisplay dpy, struct wl_display *display);
EGLAPI EGLBoolean EGLAPIENTRY eglUnbindWaylandDisplayWL(EGLDisplay dpy, struct wl_display *display);
#endif
typedef EGLBoolean (EGLAPIENTRYP PFNEGLBINDWAYLANDDISPLAYWL) (EGLDisplay dpy, struct wl_display *display);
typedef EGLBoolean (EGLAPIENTRYP PFNEGLUNBINDWAYLANDDISPLAYWL) (EGLDisplay dpy, struct wl_display *display);
#endif
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