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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.