[Wayland-bugs] [Bug 68041] New: Introduce y-flip query in eglQueryWaylandBufferWL

[bugzilla-daemon at freedesktop.org]

https://bugs.freedesktop.org/show_bug.cgi?id=68041

          Priority: medium
            Bug ID: 68041
          Assignee: wayland-bugs at lists.freedesktop.org
           Summary: Introduce y-flip query in eglQueryWaylandBufferWL
          Severity: normal
    Classification: Unclassified
                OS: Linux (All)
          Reporter: sheffmail at mail.ru
          Hardware: Other
            Status: NEW
           Version: 1.0.x
         Component: wayland
           Product: Wayland

There should be a way to tell the compositor if wl_buffer's contents are
y-flipped or not. X11 and EGL already have similar functionality:
GLX_Y_INVERTED_EXT on X11
EGL_Y_INVERTED_NOK on EGL - Nokia's extension.
Both are not suitable for wayland since wayland is obviously not related to X11
and EGL_Y_INVERTED_NOK is a part of EGL_NOK_texture_from_pixmap extension,
which implies pixmap support (wayland doesn't support pixmaps).
Thus, eglQueryWaylandBufferWL should be extended with a new attribute,
something like EGL_WAYLAND_Y_INVERTED_WL, OpenGL implementation will then be
able to tell the compositor that wl_buffer is y-flipped

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