EGLBoolean eglUnbindWaylandDisplayWL(EGLDisplay dpy,
struct wl_display *display);
+ EGLBoolean eglQueryWaylandBufferWL(EGLDisplay dpy,
+ struct wl_buffer *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
+
+
Additions to the EGL 1.4 Specification:
To bind a server side wl_display to an EGLDisplay, call
eglUnbindWaylandDisplayWL returns EGL_FALSE when there is no
wl_display bound to the EGLDisplay currently otherwise EGL_TRUE.
- Import a wl_buffer by calling eglCreateImageKHR with
- wl_buffer as EGLClientBuffer, EGL_WAYLAND_BUFFER_WL as the target,
- NULL context and an empty attribute_list.
+ 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.
+
+ 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.
Issues
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. (Kristian Høgsberg)
projects / mesa.git / blobdiff