egl: Native Display autodetection

EGL doesnt define howto manage different native platforms.
So mesa has a builtime configurable default platform,
whith non-standard envvar (EGL_PLATFORM) overwrites.
This caused unneeded bugreports, when EGL_PLATFORM was forgotten.

Detection is grouped into basic types of NativeDisplays (which itself
needs to be detected).  The final decision is based on characteristcs
of these basic types:

  File Desciptor based platforms (fbdev):
    - fstat(2) to check for being a fd that belongs to a character device
    - check kernel subsystem (todo)

  Pointer to structuctures (x11, wayland, drm/gbm):
    - mincore(2) to check whether its valid pointer to some memory.
    - magic elements (e.g. pointers to exported symbols):
      o wayland display stores interface type pointer (first elm.)
      o gbm stores pointer to its constructor (first elm.)
      o x11 as a fallback (FIXME?)

Reviewed-by: Kristian Høgsberg <krh@bitplanet.net>

1 files changed, 4 insertions, 4 deletions

diff --git a/src/egl/main/eglapi.c b/src/egl/main/eglapi.c
index 0ba7794e2c9..5d186c60e5a 100644
--- a/src/egl/main/eglapi.c
+++ b/src/egl/main/eglapi.c
@@ -301,7 +301,7 @@ _eglUnlockDisplay(_EGLDisplay *dpy)
 EGLDisplay EGLAPIENTRY
 eglGetDisplay(EGLNativeDisplayType nativeDisplay)
 {
-   _EGLPlatformType plat = _eglGetNativePlatform();
+   _EGLPlatformType plat = _eglGetNativePlatform(nativeDisplay);
    _EGLDisplay *dpy = _eglFindDisplay(plat, (void *) nativeDisplay);
    return _eglGetDisplayHandle(dpy);
 }
@@ -538,7 +538,7 @@ eglCreateWindowSurface(EGLDisplay dpy, EGLConfig config,
    EGLSurface ret;
 
    _EGL_CHECK_CONFIG(disp, conf, EGL_NO_SURFACE, drv);
-   if (disp->Platform != _eglGetNativePlatform())
+   if (disp->Platform != _eglGetNativePlatform(disp->PlatformDisplay))
       RETURN_EGL_ERROR(disp, EGL_BAD_NATIVE_WINDOW, EGL_NO_SURFACE);
 
    surf = drv->API.CreateWindowSurface(drv, disp, conf, window, attrib_list);
@@ -559,7 +559,7 @@ eglCreatePixmapSurface(EGLDisplay dpy, EGLConfig config,
    EGLSurface ret;
 
    _EGL_CHECK_CONFIG(disp, conf, EGL_NO_SURFACE, drv);
-   if (disp->Platform != _eglGetNativePlatform())
+   if (disp->Platform != _eglGetNativePlatform(disp->PlatformDisplay))
       RETURN_EGL_ERROR(disp, EGL_BAD_NATIVE_PIXMAP, EGL_NO_SURFACE);
 
    surf = drv->API.CreatePixmapSurface(drv, disp, conf, pixmap, attrib_list);
@@ -720,7 +720,7 @@ eglCopyBuffers(EGLDisplay dpy, EGLSurface surface, EGLNativePixmapType target)
    EGLBoolean ret;
 
    _EGL_CHECK_SURFACE(disp, surf, EGL_FALSE, drv);
-   if (disp->Platform != _eglGetNativePlatform())
+   if (disp->Platform != _eglGetNativePlatform(disp->PlatformDisplay))
       RETURN_EGL_ERROR(disp, EGL_BAD_NATIVE_PIXMAP, EGL_FALSE);
    ret = drv->API.CopyBuffers(drv, disp, surf, target);