зеркало из https://github.com/AvaloniaUI/angle.git
162 строки
4.7 KiB
Plaintext
162 строки
4.7 KiB
Plaintext
Name
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EGL_ANGLE_feature_control
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Name Strings
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EGL_ANGLE_feature_control
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Contributors
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Jonah Ryan-Davis (jonahr 'at' google.com)
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Contact
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Jonah Ryan-Davis (jonahr 'at' google.com)
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Status
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Draft
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Version
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Version 1, May 23, 2019
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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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This extension is written against the wording of the EGL 1.5
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Specification.
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EGL_EXT_device_query affects the definition of this extension.
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Overview
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This extension adds two methods to query arrays holding
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information about the available features for a given device.
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One method is used to query the total count of available
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features. Another method is used to query a string property
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of an individual feature given the feature's index.
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IP Status
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No known claims.
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New Types
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None.
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New Procedures and Functions
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const char *eglQueryStringiANGLE(
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EGLDisplay dpy,
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EGLint name,
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EGLint index);
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EGLBoolean eglQueryDisplayAttribANGLE(
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EGLDisplay dpy,
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EGLint attribute,
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EGLAttrib *value);
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New Tokens
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Accepted as a queried <name> in eglQueryStringiANGLE:
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EGL_FEATURE_NAME_ANGLE 0x3460
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EGL_FEATURE_CATEGORY_ANGLE 0x3461
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EGL_FEATURE_DESCRIPTION_ANGLE 0x3462
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EGL_FEATURE_BUG_ANGLE 0x3463
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EGL_FEATURE_STATUS_ANGLE 0x3464
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Accepted as a queried <attribute> in eglQueryDisplayAttribANGLE
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EGL_FEATURE_COUNT_ANGLE 0x3465
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Accepted as an attribute name in the <attrib_list> argument of
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eglGetPlatformDisplay
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EGL_FEATURE_OVERRIDES_ENABLED_ANGLE 0x3466
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EGL_FEATURE_OVERRIDES_DISABLED_ANGLE 0x3467
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New Behavior
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The attribute following EGL_FEATURE_OVERRIDES_ENABLED_ANGLE or
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EGL_FEATURE_OVERRIDES_DISABLED_ANGLE should be of type char**,
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which should contain a null-terminated array of C strings naming
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the features to be enabled or disabled upon display creation.
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Any features unspecified in one of these arrays will be
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initialized with an internal heuristic.
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Add the following to the end of section 3.3 "EGL Queries":
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const char *eglQueryStringiANGLE(EGLDisplay dpy,
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EGLint name, EGLint index);
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eGLQueryStringiANGLE returns a pointer to a static, null-
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terminated string describing some aspect of the EGL
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implementation running on the specified display, from an array of
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strings. name may be one of EGL_FEATURE_NAME_ANGLE,
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EGL_FEATURE_CATEGORY_ANGLE, EGL_FEATURE_DESCRIPTION_ANGLE,
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EGL_FEATURE_BUG_ANGLE, or EGL_FEATURE_STATUS_ANGLE. Index
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must be a valid index to access into the array of strings.
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The EGL_FEATURE_NAME_ANGLE array contains strings that
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describe the name of each feature available in the display.
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The EGL_FEATURE_CATEGORY_ANGLE array contains strings
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with corresponding indices to the array of names. Each string
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describes the category of the feature at the specified index.
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The EGL_FEATURE_DESCRIPTION_ANGLE array contains strings
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with corresponding indices to the array of names. Each string
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describes the feature at the specified index.
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The EGL_FEATURE_BUG_ANGLE array contains strings
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with corresponding indices to the array of names. Each string
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describes the bug related to the feature at the specified
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index.
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The EGL_FEATURE_STATUS_ANGLE array contains strings
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with corresponding indices to the array of names. Each string has
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the value "enabled" if the feature is currently enabled, or
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"disabled" if the feature is currently disabled.
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Errors
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On failure, NULL is returned.
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An EGL_BAD_DISPLAY error is generated if dpy is not a valid
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display.
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An EGL_BAD_PARAMETER error is generated if name is not one of the
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values described above.
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An EGL_BAD_PARAMETER error is generated if index is not within
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the valid range of indices for the array.
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Add a section "3.4 Display Attributes" after "3.3 EGL Versioning"
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To query attributes of an initialized display, use:
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EGLBoolean eglQueryDisplayAttribANGLE(EGLDisplay dpy,
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EGLint attribute,
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EGLAttrib *value);
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On success, EGL_TRUE is returned.
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If <attribute> is EGL_FEATURE_COUNT_ANGLE, the total count of
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available features is returned in <value>.
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On failure, EGL_FALSE is returned.
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An EGL_BAD_DISPLAY error is generated if dpy is not a valid
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display.
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An EGL_BAD_ATTRIBUTE error is generated if <attribute> is not a
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valid value.
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Issues
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None
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Revision History
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Version 1, May 23, 2019 (Jonah Ryan-Davis)
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- Initial Draft
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