kc3-lang/angle/extensions/EGL_ANGLE_x11_visual.txt

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• Hash : 3d677ea6
  Author :
  Date : 2015-11-16T13:38:47
  

  Implement EGL_ANGLE_x11_visual
  
  Reland with a fixed tests on AMD.
  
  This extension will be used by Chrome to advertise the visual it will
  use for its windows. Having ANGLE use the same visual will bring
  several benefits:
   - A blit will be avoided, and the content of the window might be
     rendered on the system framebuffer directly.
   - There will be less latency when resizing windows which will make it
     much less likely to see a black border when resizing.
  
  BUG=522149
  
  Change-Id: I66004b6ac45453330af7c4c810ddf2c26941be42
  Reviewed-on: https://chromium-review.googlesource.com/314661
  Reviewed-by: Geoff Lang <geofflang@chromium.org>
  Tested-by: Corentin Wallez <cwallez@chromium.org>
  

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• extensions/EGL_ANGLE_x11_visual.txt

• Name
  
      ANGLE_x11_visual
  
  Name Strings
  
      EGL_ANGLE_x11_visual
  
  Contributors
  
      Corentin Wallez, Google
      Shannon Woods, Google
      Jamie Madill, Google
      Geoff Lang, Google
  
  Contacts
  
      Corentin Wallez, Google (cwallez 'at' chromium 'dot' org)
  
  Status
  
      Draft
  
  Version
  
      Version 1, 2015-11-13
  
  Number
  
      EGL Extension XXX
  
  Extension Type
  
      EGL client extension
  
  Dependencies
  
      Requires EGL_EXT_client_extensions to query its existence without
      a display.
  
      Requires EGL_EXT_platform_base.
  
      This extension is written against the wording of version 9 of the
      EGL_EXT_platform_base specification.
  
      Written based on the wording of the EGL 1.5 Specification
      (August 7 2014).
  
  Overview
  
      This extension allows passing the X11 visual ID used by the native
      EGL surface types at display creation time. This will restrict
      EGLSurfaces to be created from native types with this visual ID,
      which may allow the created display to be more compatible and
      performant.
  
  New Types
  
      None
  
  New Procedures and Functions
  
      None
  
  New Tokens
  
      Accepted as an attribute name in the <attrib_list> argument of
      eglGetPlatformDisplayEXT:
  
          EGL_X11_VISUAL_ID_ANGLE 0x33A3
  
  Additions to the EGL Specification
  
      Modify section 3.5.1 (Creating On-Screen Rendering Surfaces), p. 34
  
      Append the following to the errors of CreateWindowSurface:
  
      "If an X11 visual was specified at display creation time using
      EGL_ANGLE_X11_VISUAL_ID that is not equal to the ID of the
      native_window's visual, an EGL_BAD_MATCH error is generated and
      EGL_NO_SURFACE is returned."
  
  New Behavior
  
      To request a display created with a X11 visual ID, the value of
      EGL_ANGLE_X11_VISUAL_ID should be set to a valid X11 visual ID. If
      present, this ID will be used during display creation to make a
      display that is more compatible and potentially more performant when
      used with EGLsurfaces created from native types with this ID. If the
      visual ID passed isn't a valid visual ID, eglGetPlatformDisplay will
      return EGL_NO_DISPLAY and generate an EGL_NOT_INITIALIZED error.
  
  Issues
  
      1) When the hint is present, should EGLsurface creation functions
         only accept native types with the hint's visual ID?
  
         RESOLVED: Yes, generate an error when the visual of the native
         surface doesn't match. This will avoid having hidden performance
         or compatibility losses when using this extension.
  
  Revision History
  
      Version 1, 2015-11-13 (Corentin Wallez)
        - Initial draft
  
  

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