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+Name
+
+    WL_bind_wayland_display
+
+Name Strings
+
+    EGL_WL_bind_wayland_display
+
+Contact
+
+    Kristian Høgsberg <krh@bitplanet.net>
+    Benjamin Franzke <benjaminfranzke@googlemail.com>
+
+Status
+
+    Complete
+
+Version
+
+    Version 6, July 14, 2017
+
+Number
+
+    EGL Extension #136
+
+Dependencies
+
+    Requires EGL 1.4 or later.  This extension is written against the
+    wording of the EGL 1.4 specification.
+
+    EGL_KHR_image_base is required.
+
+Overview
+
+    This extension provides entry points for binding and unbinding the
+    wl_display of a Wayland compositor to an EGLDisplay.  Binding a
+    wl_display means that the EGL implementation should provide one or
+    more interfaces in the Wayland protocol to allow clients to create
+    wl_buffer objects.  On the server side, this extension also
+    provides a new target for eglCreateImageKHR, to create an EGLImage
+    from a wl_buffer.
+
+    Adding an implementation-specific Wayland interface, allows the
+    EGL implementation to define specific wayland requests and events,
+    needed for buffer sharing in an EGL Wayland platform.
+
+IP Status
+
+    Open-source; freely implementable.
+
+New Procedures and Functions
+
+    EGLBoolean eglBindWaylandDisplayWL(EGLDisplay dpy,
+                                       struct wl_display *display);
+
+    EGLBoolean eglUnbindWaylandDisplayWL(EGLDisplay dpy,
+                                         struct wl_display *display);
+
+    EGLBoolean eglQueryWaylandBufferWL(EGLDisplay dpy,
+                                       struct wl_resource *buffer,
+                                       EGLint attribute, EGLint *value);
+
+New Tokens
+
+    Accepted as <target> in eglCreateImageKHR
+
+        EGL_WAYLAND_BUFFER_WL                   0x31D5
+
+    Accepted in the <attrib_list> parameter of eglCreateImageKHR:
+
+        EGL_WAYLAND_PLANE_WL                    0x31D6
+
+    Possible values for EGL_TEXTURE_FORMAT:
+
+        EGL_TEXTURE_Y_U_V_WL                    0x31D7
+        EGL_TEXTURE_Y_UV_WL                     0x31D8
+        EGL_TEXTURE_Y_XUXV_WL                   0x31D9
+        EGL_TEXTURE_EXTERNAL_WL                 0x31DA
+
+    Accepted in the <attribute> parameter of eglQueryWaylandBufferWL:
+
+        EGL_TEXTURE_FORMAT                      0x3080
+        EGL_WAYLAND_Y_INVERTED_WL               0x31DB
+
+
+Additions to the EGL 1.4 Specification:
+
+    To bind a server-side wl_display to an EGLDisplay, call
+
+        EGLBoolean eglBindWaylandDisplayWL(EGLDisplay dpy,
+                                           struct wl_display *display);
+
+    To unbind a server-side wl_display from an EGLDisplay, call
+    
+        EGLBoolean eglUnbindWaylandDisplayWL(EGLDisplay dpy,
+                                             struct wl_display *display);
+
+    eglBindWaylandDisplayWL returns EGL_FALSE when there is already a
+    wl_display bound to EGLDisplay otherwise EGL_TRUE.
+
+    eglUnbindWaylandDisplayWL returns EGL_FALSE when there is no
+    wl_display bound to the EGLDisplay currently otherwise EGL_TRUE.
+
+    XXXXXXXX 
+    EGL_WAYLAND_BUFFER_WL
+
+
+    To query attributes of a wl_buffer created by the EGL
+    implementation installed by eglBindWaylandDisplayWL, call:
+
+        EGLBoolean eglQueryWaylandBufferWL(EGLDisplay dpy,
+                                           struct wl_resource *buffer,
+                                           EGLint attribute,
+					   EGLint *value);
+
+    A wl_buffer can have several planes, typically in case of planar
+    YUV formats.  Depending on the exact YUV format in use, the
+    compositor will have to create one or more EGLImages for the
+    various planes.  The eglQueryWaylandBufferWL function should be
+    used to first query the wl_buffer texture format using
+    EGL_TEXTURE_FORMAT as the attribute.  If the wl_buffer object is
+    not an EGL wl_buffer (wl_shm and other wayland extensions can
+    create wl_buffer objects of different types), this query will
+    return EGL_FALSE.  In that case the wl_buffer can not be used with
+    EGL and the compositor should have another way to get the buffer
+    contents.
+
+    If eglQueryWaylandBufferWL succeeds, the returned value will be
+    one of EGL_TEXTURE_RGB, EGL_TEXTURE_RGBA, EGL_TEXTURE_Y_U_V_WL,
+    EGL_TEXTURE_Y_UV_WL, EGL_TEXTURE_Y_XUXV_WL.  The value returned
+    describes how many EGLImages must be used, which components will
+    be sampled from each EGLImage and how they map to rgba components
+    in the shader.  The naming conventions separates planes by _ and
+    within each plane, the order or R, G, B, A, Y, U, and V indicates
+    how those components map to the rgba value returned by the
+    sampler.  X indicates that the corresponding component in the rgba
+    value isn't used.
+
+    RGB and RGBA buffer types:
+
+        EGL_TEXTURE_RGB
+                One plane, samples RGB from the texture to rgb in the
+                shader.  Alpha channel is not valid.
+
+        EGL_TEXTURE_RGBA
+                One plane, samples RGBA from the texture to rgba in the
+                shader.
+
+    YUV buffer types:
+
+        EGL_TEXTURE_Y_U_V_WL
+                Three planes, samples Y from the first plane to r in
+                the shader, U from the second plane to r, and V from
+                the third plane to r.
+
+        EGL_TEXTURE_Y_UV_WL
+                Two planes, samples Y from the first plane to r in
+                the shader, U and V from the second plane to rg.
+
+        EGL_TEXTURE_Y_XUXV_WL
+                Two planes, samples Y from the first plane to r in
+                the shader, U and V from the second plane to g and a.
+
+        EGL_TEXTURE_EXTERNAL_WL
+                Treated as a single plane texture, but sampled with
+                samplerExternalOES according to OES_EGL_image_external
+
+    After querying the wl_buffer layout, create EGLImages for the
+    planes by calling eglCreateImageKHR with wl_buffer as
+    EGLClientBuffer, EGL_WAYLAND_BUFFER_WL as the target, NULL
+    context.  If no attributes are given, an EGLImage will be created
+    for the first plane.  For multi-planar buffers, specify the plane
+    to create the EGLImage for by using the EGL_WAYLAND_PLANE_WL
+    attribute.  The value of the attribute is the index of the plane,
+    as defined by the buffer format.  Writing to an EGLImage created
+    from a wl_buffer in any way (such as glTexImage2D, binding the
+    EGLImage as a renderbuffer etc) will result in undefined behavior.
+
+    Further, eglQueryWaylandBufferWL accepts attributes EGL_WIDTH and
+    EGL_HEIGHT to query the width and height of the wl_buffer.
+
+    Also, eglQueryWaylandBufferWL may accept
+    EGL_WAYLAND_Y_INVERTED_WL attribute to query orientation of
+    wl_buffer. If EGL_WAYLAND_Y_INVERTED_WL is supported
+    eglQueryWaylandBufferWL returns EGL_TRUE and value is a boolean
+    that tells if wl_buffer is y-inverted or not. If
+    EGL_WAYLAND_Y_INVERTED_WL is not supported
+    eglQueryWaylandBufferWL returns EGL_FALSE, in that case
+    wl_buffer should be treated as if value of
+    EGL_WAYLAND_Y_INVERTED_WL was EGL_TRUE.
+
+Issues
+
+Revision History
+
+    Version 1, March 1, 2011
+        Initial draft (Benjamin Franzke)
+    Version 2, July 5, 2012
+        Add EGL_WAYLAND_PLANE_WL attribute to allow creating an EGLImage
+        for different planes of planar buffer. (Kristian Høgsberg)
+    Version 3, July 10, 2012
+        Add eglQueryWaylandBufferWL and the various buffer
+        formats. (Kristian Høgsberg)
+    Version 4, July 19, 2012
+        Use EGL_TEXTURE_FORMAT, EGL_TEXTURE_RGB, and EGL_TEXTURE_RGBA,
+        and just define the new YUV texture formats.  Add support for
+        EGL_WIDTH and EGL_HEIGHT in the query attributes (Kristian Høgsberg)
+    Version 5, July 16, 2013
+        Change eglQueryWaylandBufferWL to take a resource pointer to the
+        buffer instead of a pointer to a struct wl_buffer, as the latter has
+        been deprecated. (Ander Conselvan de Oliveira)
+    Version 6, September 16, 2013
+        Add EGL_WAYLAND_Y_INVERTED_WL attribute to allow specifying
+        wl_buffer's orientation.
+    Version 7, July 14, 2017
+        Add EGL_WAYLAND_BUFFER_WL EGLImage target. Reword for inclusion in
+	Khronos registry.