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Name
ANGLE_experimental_present_path
Name Strings
EGL_ANGLE_experimental_present_path
Contributors
Austin Kinross
Contacts
Austin Kinross (aukinros 'at' microsoft 'dot' com)
Status
Experimental
Version
Version 1, Jan 22 2016
Number
EGL Extension #XXX
Extension Type
EGL display extension
Dependencies
Requires ANGLE_platform_angle_d3d.
Written against the wording of EGL 1.4 as modified by
ANGLE_platform_angle_d3d.
Overview
This extension exposes an optimized, but potentially non-conformant,
rendering path for ANGLE's D3D11 renderer on Windows.
New Types
None
New Procedures and Functions
None
New Tokens
Accepted as an attribute name in the <attrib_list> argument of
eglGetPlatformDisplayEXT:
EGL_EXPERIMENTAL_PRESENT_PATH_ANGLE 0x33A4
Accepted as values for the EGL_EXPERIMENTAL_PRESENT_PATH_ANGLE attribute:
EGL_EXPERIMENTAL_PRESENT_PATH_FAST_ANGLE 0x33A9
EGL_EXPERIMENTAL_PRESENT_PATH_COPY_ANGLE 0x33AA
Additions to the EGL Specification
None.
New Behavior
To request a display that enables this optimized rendering path,
the value of EGL_EXPERIMENTAL_PRESENT_PATH_ANGLE should be set to
EGL_EXPERIMENTAL_PRESENT_PATH_FAST_ANGLE. Setting this value may impact
OpenGL ES conformance (see Issue 1 below).
The only valid values for the attribute
EGL_EXPERIMENTAL_PRESENT_PATH_ANGLE are
EGL_EXPERIMENTAL_PRESENT_PATH_FAST_ANGLE and
EGL_EXPERIMENTAL_PRESENT_PATH_COPY_ANGLE. If any other value is specified
then an EGL_BAD_ATTRIBUTE error is generated and EGL_NO_DISPLAY is
returned.
If a value for EGL_EXPERIMENTAL_PRESENT_PATH_ANGLE is specified and
EGL_PLATFORM_ANGLE_TYPE_ANGLE is not set to
EGL_PLATFORM_ANGLE_TYPE_D3D11_ANGLE then an EGL_BAD_ATTRIBUTE error is
generated and EGL_NO_DISPLAY is returned.
If the attribute EGL_EXPERIMENTAL_PRESENT_PATH_ANGLE
is unspecified then it is implicitly set to
EGL_EXPERIMENTAL_PRESENT_PATH_COPY_ANGLE.
Issues
1) Does setting EGL_EXPERIMENTAL_PRESENT_PATH_ANGLE to be
EGL_EXPERIMENTAL_PRESENT_PATH_FAST_ANGLE maintain OpenGL ES
conformance?
RESOLVED: Not necessarily, that is implementation-specific. Check then
EGL_CONFORMANT attribute to see if the implementation supports any
conformant EGL configs when EGL_EXPERIMENTAL_PRESENT_PATH_FAST_ANGLE
is specified.
Revision History
Version 1, Jan 22 2016 (Austin Kinross)
- Initial draft
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