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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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