kc3-lang/angle/extensions/EGL_ANGLE_feature_control.txt

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• Hash : beb0eb2d
  Author :
  Date : 2019-06-14T15:10:33
  

  Clean up workarounds/features to single location.
  
  Rename all workarounds structs to features, and move the lists to a
  shared location in include/platform (to help with documentation,
  see:
  https://cs.chromium.org/chromium/src/ui/gl/gl_switches.cc?sq=package:chromium&g=0&l=69)
  
  Bug: angleproject:1621
  Change-Id: I4069f08131db5e886047a007efb5d7764dfee5f2
  Reviewed-on: https://chromium-review.googlesource.com/c/angle/angle/+/1660952
  Commit-Queue: Jonah Ryan-Davis <jonahr@google.com>
  Reviewed-by: Jamie Madill <jmadill@chromium.org>
  

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• extensions/EGL_ANGLE_feature_control.txt

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

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