kc3-lang/angle/extensions/EGL_ANGLE_display_semaphore_share_group.txt

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• Hash : 4cf2501c
  Author :
  Date : 2020-07-27T13:19:27
  

  Add extension EGL_ANGLE_display_semaphore_share_group
  
  For sharing semaphores globally.
  
  Bug: angleproject:4877
  Change-Id: I472e0902fd04ca8350d74e6c0ae6925ee930ccf9
  Reviewed-on: https://chromium-review.googlesource.com/c/angle/angle/+/2319370
  Commit-Queue: Jamie Madill <jmadill@chromium.org>
  Reviewed-by: Shahbaz Youssefi <syoussefi@chromium.org>
  Reviewed-by: Jamie Madill <jmadill@chromium.org>
  

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• extensions/EGL_ANGLE_display_semaphore_share_group.txt

• Name
  
      ANGLE_display_semaphore_share_group
  
  Name Strings
  
      EGL_ANGLE_display_semaphore_share_group
  
  Contributors
  
      Peng Huang, Google
  
  Contacts
  
      Peng Huang, Google (penghuang 'at' google.com)
  
  Status
  
      Draft
  
  Version
  
      Version 1, July 27, 2020
  
  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
      semaphore objects with other contexts owned by the same display. This method
      of sharing semaphores 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_SEMAPHORE_SHARE_GROUP_ANGLE    0x348D
  
  Additions to the EGL 1.5 Specification
  
      Add a new section entitled "OpenGL ES Global Semaphore Share Groups"
      to section 3.7.1:
  
      "If the attribute EGL_DISPLAY_SEMAPHORE_SHARE_GROUP_ANGLE is set to EGL_TRUE,
      a context that shares semaphores with other contexts owned by the same
      display and created with EGL_DISPLAY_SEMAPHORE_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_SEMAPHORE_SHARE_GROUP_ANGLE.
      The default value of EGL_DISPLAY_SEMAPHORE_SHARE_GROUP_ANGLE is EGL_FALSE."
  
  Issues
  
      (1) What happens to the shared semaphores when a context in the global share
          group is destroyed?
  
      RESOLOVED: When the last context in the global semaphore share group is
      destroyed, all semaphores in the global semaphore share group are released. If
      a new context is created in the global semaphore share group, no semaphores
      will exist.
  
      This mirrors how regular share groups work, releasing all objects when the
      last context is destroyed.
  
  Revision History
  
      Version 1, 2020/07/27 - first draft.
  

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