зеркало из https://github.com/AvaloniaUI/angle.git
179 строки
6.0 KiB
Plaintext
179 строки
6.0 KiB
Plaintext
Name
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ANGLE_platform_angle
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Name Strings
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EGL_ANGLE_platform_angle
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Contributors
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Scott Graham, Google
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Shannon Woods, Google
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Geoff Lang, Google
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Contacts
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Scott Graham, Google (scottmg 'at' google 'dot' com)
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Status
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Draft
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Version
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Version 5, 2017-12-28
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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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ANGLE_platform_angle_d3d affects the definition of this extension.
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ANGLE_platform_angle_opengl affects the definition of this extension.
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Overview
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This extension defines how to create EGL resources from native resources
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using the functions defined by EGL_EXT_platform_base.
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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 the <platform> argument of eglGetPlatformDisplayEXT:
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EGL_PLATFORM_ANGLE_ANGLE 0x3202
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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_PLATFORM_ANGLE_TYPE_ANGLE 0x3203
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EGL_PLATFORM_ANGLE_MAX_VERSION_MAJOR_ANGLE 0x3204
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EGL_PLATFORM_ANGLE_MAX_VERSION_MINOR_ANGLE 0x3205
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EGL_PLATFORM_ANGLE_DEBUG_LAYERS_ENABLED 0x3451
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Accepted as values for the EGL_PLATFORM_ANGLE_TYPE_ANGLE attribute:
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EGL_PLATFORM_ANGLE_TYPE_DEFAULT_ANGLE 0x3206
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Accepted as values for the EGL_PLATFORM_ANGLE_DEVICE_TYPE_ANGLE attribute:
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EGL_PLATFORM_ANGLE_DEVICE_TYPE_HARDWARE_ANGLE 0x320A
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EGL_PLATFORM_ANGLE_DEVICE_TYPE_NULL_ANGLE 0x345E
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Accepted as values for the EGL_PLATFORM_ANGLE_NATIVE_PLATFORM_TYPE_ANGLE
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attribute:
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EGL_PLATFORM_X11_EXT 0x31D5
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EGL_PLATFORM_DEVICE_EXT 0x313F
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EGL_PLATFORM_SURFACELESS_MESA 0x31DD
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Additions to the EGL Specification
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None.
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New Behavior
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To determine if the EGL implementation supports this extension, clients
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should query the EGL_EXTENSIONS string of EGL_NO_DISPLAY.
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To obtain an EGLDisplay backed by a ANGLE display, call
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eglGetPlatformDisplayEXT with <platform> set to EGL_PLATFORM_ANGLE_ANGLE.
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The <native_display> parameter is of type EGLNativeDisplayType. If
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<native_display> is EGL_DEFAULT_DISPLAY a default display is returned.
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Multiple calls with the same <native_display> will return the same
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EGLDisplay handle. If <platform> is set to EGL_PLATFORM_ANGLE_ANGLE and
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the returned display is in an uninitialized state, its attributes are
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overwritten by those provided in the <attrib_list>, if any.
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If no <attrib_list> is specified, the value of
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EGL_PLATFORM_ANGLE_TYPE_ANGLE is implicitly set to
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EGL_PLATFORM_ANGLE_TYPE_DEFAULT_ANGLE.
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If no <attrib_list> is specified, the values of
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EGL_PLATFORM_ANGLE_MAX_VERSION_MAJOR_ANGLE and
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EGL_PLATFORM_ANGLE_MAX_VERSION_MINOR_ANGLE are implicitly set to
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EGL_DONT_CARE.
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If no <attrib_list> is specified, the value of
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EGL_PLATFORM_ANGLE_DEBUG_LAYERS_ENABLED is implicitly set to
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EGL_DONT_CARE.
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If no <attrib_list> is specified to eglGetPlatformDisplayEXT, the value of
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EGL_PLATFORM_ANGLE_DEVICE_TYPE_ANGLE is implicitly set to
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EGL_PLATFORM_ANGLE_DEVICE_TYPE_HARDWARE_ANGLE. Otherwise, the value of
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EGL_PLATFORM_ANGLE_DEVICE_TYPE_ANGLE should be:
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- EGL_PLATFORM_ANGLE_DEVICE_TYPE_HARDWARE_ANGLE to request a hardware
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accelerated device.
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- EGL_PLATFORM_ANGLE_DEVICE_TYPE_NULL_ANGLE to request a no-op driver
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for testing. If unavailable, the implementation will fall back to
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EGL_PLATFORM_ANGLE_DEVICE_TYPE_HARDWARE_ANGLE.
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If EGL_PLATFORM_ANGLE_MAX_VERSION_MAJOR_ANGLE is set to EGL_DONT_CARE and
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EGL_PLATFORM_ANGLE_MAX_VERSION_MINOR_ANGLE is not set to EGL_DONT_CARE,
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an EGL_BAD_ATTRIBUTE error is generated and EGL_NO_DISPLAY is returned.
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If no display matching the requested <native_display> or of the type
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requested by the value of EGL_PLATFORM_ANGLE_TYPE_ANGLE is available,
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EGL_NO_DISPLAY is returned. No error condition is raised in this case.
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If EGL_PLATFORM_ANGLE_DEBUG_LAYERS_ENABLED is specified, it
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controls enabling back-end validation layers. EGL_TRUE enables
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validation and EGL_FALSE disables it. If it is set to EGL_DONT_CARE, the
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default setting depends on the implementation. Any value other than these
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will result in an error.
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EGL_PLATFORM_ANGLE_NATIVE_PLATFORM_TYPE_ANGLE is an additional optional
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attribute that helps ANGLE to identify what native underlaying platform
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it should use. If no display matching the requested type of native platform
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found, EGL_NO_DISPLAY should be returned. if no <attrib_list> is specified
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to eglGetPlatformDisplayEXT, ANGLE is free to make the choice.
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Issues
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1) Should the validation layers default to on, off, or no guarantee?
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Defaulting to off offers some consistency. However, it's customary for
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some applications like ANGLE to turn on debugging features by default
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in Debug builds.
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RESOLVED: default to implementation-dependent behaviour.
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Revision History
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Version 1, 2014-02-04 (Scott Graham)
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- Initial draft
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Version 2, 2014-06-05 (Geoff Lang)
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- Rename extension from ANGLE_platform_angle_d3d to ANGLE_platform_angle.
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- Add sub-extensions for specific platforms.
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Version 3, 2014-10-20 (Geoff Lang)
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- Add attributes to request specific feature level and context versions.
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- Moved descriptions of platforms to child extension specs.
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Version 4, 2017-07-19 (Jamie Madill)
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- Add a debug layers enabled attribute to control runtime validation.
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Version 5, 2017-12-28 (Jamie Madill)
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- Expose device type selection.
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Version 6, 2020-05-28 (Maksim Sisov)
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- Add EGL_PLATFORM_ANGLE_NATIVE_PLATFORM_TYPE_ANGLE attribute.
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