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Name
ANGLE_direct_composition
Name Strings
EGL_ANGLE_direct_composition
Contributors
John Bauman
Contacts
John Bauman (jbauman 'at' google.com)
Status
Draft
Version
Version 2, Dec 14, 2015
Number
EGL Extension #??
Dependencies
This extension is written against the wording of the EGL 1.5 Specification.
Overview
This extension allows specifying that the contents of a window surface be
posted to the screen using the DirectComposition API.
New Types
None
New Procedures and Functions
None
New Tokens
Accepted by the <attribute> parameter of eglQuerySurface and by the
<attrib_list> parameter of eglCreateWindowSurface and
eglCreatePlatformWindowSurface
EGL_DIRECT_COMPOSITION_ANGLE 0x33A5
Changes to Chapter 3 of the EGL 1.5 Specification (EGL Functions and Errors)
Modify the fourth paragraph of Section 3.5.1, page 32
(Creating On-Screen rendering Surfaces)
"<attrib_list> specifies a list of attributes for the window. The list has
the same structure as described for eglChooseConfig. Attributes that can
be specified in <attrib_list> include EGL_DIRECT_COMPOSITION_ANGLE,
EGL_GL_COLORSPACE, EGL_RENDER_BUFFER, EGL_VG_COLORSPACE, and
EGL_VG_ALPHA_FORMAT."
Add the following between paragraphs 6 and 7 of Section 3.5.1, page 32
(Creating On-Screen Rendering Surfaces)
"EGL_DIRECT_COMPOSITION_ANGLE specifies whether the surface will be posted
to the window using DirectComposition. The default is EGL_FALSE. If
EGL_TRUE is specified, <native_window> must be owned by the current
process, and contents drawn by native APIs or EGLSurfaces with
EGL_DIRECT_COMPOSITION_ANGLE as EGL_FALSE will appear underneath the
contents of this surface."
Add the following entry to Table 3.5, page 44 (Queryable surface
attributes and types)
Attribute Type Description
---------------------------- ------- --------------------------------------
EGL_DIRECT_COMPOSITION_ANGLE boolean Surface will be posted to the window
using DirectComposition
Issues
1. Should a surface attrib or config be used to specify that
DirectComposition is needed.
PROPOSED: A surface attrib would work and avoids creating
otherwise-duplicate configs.
Revision History
Version 2, 2015/12/14
- Use attrib instead of config.
Version 1, 2015/12/10
- Initial draft.
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