kc3-lang/angle/extensions/EGL_ANGLE_display_texture_share_group.txt

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• Author : Geoff Lang
  Date : 2017-02-14 10:41:32
  Hash : 40dc8c10
  Message : Release the global texture manager with the last referencing context. This ensures that when the global texture manager is released, there is a valid context. BUG=angleproject:1639 Change-Id: I1b75885e9dc02b607bb1a386de394f6087429f5d Reviewed-on: https://chromium-review.googlesource.com/442074 Reviewed-by: Jamie Madill <jmadill@chromium.org> Reviewed-by: Corentin Wallez <cwallez@chromium.org> Commit-Queue: Geoff Lang <geofflang@chromium.org>

• extensions/EGL_ANGLE_display_texture_share_group.txt

• Name
  
      ANGLE_display_texture_share_group
  
  Name Strings
  
      EGL_ANGLE_display_texture_share_group
  
  Contributors
  
      Geoff Lang, Google
  
  Contacts
  
      Geoff Lang, Google (geofflang 'at' google.com)
  
  Status
  
      Draft
  
  Version
  
      Version 1, February 7, 2017
  
  Number
  
      EGL Extension TBD
  
  Dependencies
  
      This extension is written against the wording of the EGL 1.5 specification.
  
  Overview
  
      This extension allows for the creation of OpenGL ES contexts that share
      texture objects with other contexts owned by the same display. This method
      of sharing textures can be used in conjuction with regular share groups.
  
  New Types
  
      None
  
  New Procedures and Functions
  
      None
  
  New Tokens
  
      Accepted as an attribute name in the <*attrib_list> argument to
      eglCreateContext:
  
          EGL_DISPLAY_TEXTURE_SHARE_GROUP_ANGLE    0x33AF
  
  Additions to the EGL 1.5 Specification
  
      Add a new section entitled "OpenGL ES Global Texture Share Groups"
      to section 3.7.1:
  
      "If the attribute EGL_DISPLAY_TEXTURE_SHARE_GROUP_ANGLE is set to EGL_TRUE,
      a context that shares textures with other contexts owned by the same
      display and created with EGL_DISPLAY_TEXTURE_SHARE_GROUP_ANGLE set to
      EGL_TRUE will be created. If the share_context parameter to
      eglCreateContext is not NULL, all contexts within the share group must have
      been created with the same value of EGL_DISPLAY_TEXTURE_SHARE_GROUP_ANGLE.
      The default value of EGL_DISPLAY_TEXTURE_SHARE_GROUP_ANGLE is EGL_FALSE."
  
  Issues
  
      (1) What happens to the shared textures when a context in the global share
          group is destroyed?
  
      RESOLOVED: When the last context in the global texture share group is
      destroyed, all textures in the global texture share group are released. If
      a new context is created in the global texture share group, no textures
      will exist.
  
      This mirrors how regular share groups work, releasing all objects when the
      last context is destroyed.
  
  Revision History
  
      Version 1, 2017/02/07 - first draft.