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