Display problem in GTK/Webkit with RK3288 Mali-T764

Hi,

GTK issue

I build gtk3 and test testglarea program, it can't show color triangle.

SOC: RK3288W

kernel: 4.4.103 (git://github.com/rockchip-linux/kernel.git branch release-4.4)

mali version: libmali-midgard-t76x-r14p0-r1p0-wayland.so

gtk version: gtk+-3.24.20

gtk config:

./configure \
    --target=arm-linux \
    --host=arm-linux    \
    --enable-wayland-backend \
    --disable-x11-backend \
    --disable-dependency-tracking \
    --disable-win32-backend \
    --disable-quartz-backend \
    --disable-broadway-backend \
    --disable-silent-rules \
    --disable-gtk-doc \
    --disable-maintainer-mode \
    --disable-schemas-compile \
    --disable-xinerama \
    --disable-mir-backend \
    --disable-papi \
    --disable-glibtest \
    --disable-xinerama \
    --enable-modules \
    --disable-cups \
    --disable-colord \
    --disable-gtk-doc \
    --disable-introspection

program: testglarea

result 1: it show No GL implement message

result 2:

I try to remove https://gitlab.gnome.org/GNOME/gtk/-/blob/master/gdk/wayland/gdkglcontext-wayland.c#L338 and L338, it seems to display something, but color triangle wouldn't be displayed.

WebKit issue

Webkit version: webkitgtk-2.26.4

config:

cmake -DCMAKE_BUILD_TYPE=Release \
-DPORT=GTK \
-DENABLE_MINIBROWSER=ON \
-DPYTHON_EXECUTABLE=`which python3` \
-DENABLE_BUBBLEWRAP_SANDBOX=OFF \
-DENABLE_WAYLAND_TARGET=ON \
-DENABLE_X11_TARGET=OFF \
-DENABLE_GEOLOCATION=OFF \
-DENABLE_SPELLCHECK=OFF \
-DENABLE_OPENGL=ON \
-DENABLE_GLES2=ON \
-DENABLE_JIT=OFF \
-DENABLE_WEBGL=ON \
-DUSE_GSTREAMER_GL=OFF \
-DUSE_EGL=ON \
-DUSE_OPENGL_ES=ON \
-DUSE_WPE_RENDERER=OFF \
-DUSE_LIBSECRET=OFF \
-DUSE_LIBNOTIFY=OFF \
-DUSE_LIBHYPHEN=OFF \
-DUSE_OPENJPEG=OFF \
../

program: MiniBrowser

result: It can't show any item within browser. And terminal shows error message "EGLDisplay Initialization failed: EGL_NOT_INITIALIZED".

Have any solution to fix them.

Thanks