зеркало из https://github.com/AvaloniaUI/angle.git
107 строки
2.5 KiB
Plaintext
107 строки
2.5 KiB
Plaintext
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Name
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ANGLE_x11_visual
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Name Strings
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EGL_ANGLE_x11_visual
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Contributors
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Corentin Wallez, Google
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Shannon Woods, Google
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Jamie Madill, Google
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Geoff Lang, Google
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Contacts
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Corentin Wallez, Google (cwallez 'at' chromium 'dot' org)
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Status
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Draft
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Version
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Version 1, 2015-11-13
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Number
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EGL Extension XXX
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Extension Type
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EGL client extension
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Dependencies
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Requires EGL_EXT_client_extensions to query its existence without
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a display.
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Requires EGL_EXT_platform_base.
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This extension is written against the wording of version 9 of the
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EGL_EXT_platform_base specification.
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Written based on the wording of the EGL 1.5 Specification
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(August 7 2014).
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Overview
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This extension allows passing the X11 visual ID used by the native
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EGL surface types at display creation time. This will restrict
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EGLSurfaces to be created from native types with this visual ID,
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which may allow the created display to be more compatible and
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performant.
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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 as an attribute name in the <attrib_list> argument of
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eglGetPlatformDisplayEXT:
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EGL_X11_VISUAL_ID_ANGLE 0x33A3
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Additions to the EGL Specification
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Modify section 3.5.1 (Creating On-Screen Rendering Surfaces), p. 34
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Append the following to the errors of CreateWindowSurface:
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"If an X11 visual was specified at display creation time using
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EGL_ANGLE_X11_VISUAL_ID that is not equal to the ID of the
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native_window's visual, an EGL_BAD_MATCH error is generated and
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EGL_NO_SURFACE is returned."
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New Behavior
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To request a display created with a X11 visual ID, the value of
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EGL_ANGLE_X11_VISUAL_ID should be set to a valid X11 visual ID. If
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present, this ID will be used during display creation to make a
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display that is more compatible and potentially more performant when
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used with EGLsurfaces created from native types with this ID. If the
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visual ID passed isn't a valid visual ID, eglGetPlatformDisplay will
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return EGL_NO_DISPLAY and generate an EGL_NOT_INITIALIZED error.
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Issues
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1) When the hint is present, should EGLsurface creation functions
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only accept native types with the hint's visual ID?
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RESOLVED: Yes, generate an error when the visual of the native
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surface doesn't match. This will avoid having hidden performance
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or compatibility losses when using this extension.
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Revision History
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Version 1, 2015-11-13 (Corentin Wallez)
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- Initial draft
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