kc3-lang/angle/extensions/EGL_ANGLE_flexible_surface_compatibility.txt

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• Hash : fe3e46ab
  Author :
  Date : 2015-11-24T19:13:55
  

  Add EGL_ANGLE_flexible_surface_compatibility
  
  This extension allows users of ANGLE to make contexts current with surfaces
  that were created with different bit depths.
  
  BUG=angleproject:1223
  
  Change-Id: I9072c256e0a36aee1ce41ab69cb9a04240bf0521
  Reviewed-on: https://chromium-review.googlesource.com/314935
  Reviewed-by: Geoff Lang <geofflang@chromium.org>
  Tryjob-Request: John Bauman <jbauman@chromium.org>
  Tested-by: John Bauman <jbauman@chromium.org>
  

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• extensions/EGL_ANGLE_flexible_surface_compatibility.txt

• Name
  
      ANGLE_flexible_surface_compatibility
  
  Name Strings
  
      EGL_ANGLE_flexible_surface_compatibility
  
  Contributors
  
      John Bauman   (jbauman 'at' google.com)
      Shannon Woods (shannonwoods 'at' google.com)
  
  Contact
  
      John Bauman   (jbauman 'at' google.com)
  
  Status
  
      Draft
  
  Version
  
      Version 3, Dec 15, 2015
  
  Number
  
      EGL Extension #XXX
  
  Extension Type
  
      EGL display extension
  
  Dependencies
  
      This extension is written against the language of EGL 1.5.
  
  Overview
  
      Some EGL implementations may allow any surface to be made current with any
      context from the same display, without restrictions due to bit depth.
  
  IP Status
  
      No known claims.
  
  New Types
  
      None.
  
  New Procedures and Functions
  
      None.
  
  New Tokens
  
      Accepted by the <attribute> parameter of eglQuerySurface and by the
      <attrib_list> parameter of eglCreateWindowSurface,
      eglCreatePlatformWindowSurface, eglCreatePbufferSurface, and
      eglCreatePbufferFromClientBuffer:
  
      EGL_FLEXIBLE_SURFACE_COMPATIBILITY_SUPPORTED_ANGLE  0x33A6
  
  Changes to Chapter 2 of the EGL 1.5 Specification (EGL Operation)
  
      Replace the first paragraph of the first bulleted list item in section
      2.2, page 4
      (Rendering Contexts and Drawing Surfaces)
  
      "They support the same type of color buffer (RGB or luminance), or the
      surface has the EGL_FLEXIBLE_SURFACE_COMPATIBILITY_SUPPORTED_ANGLE
      attribute set to EGL_TRUE."
  
      Replace the first paragraph of the second bulleted list item in section
      2.2, page 4
      (Rendering Contexts and Drawing Surfaces)
  
      "They have color buffers and ancillary buffers of the same depth, or the
      surface has the EGL_FLEXIBLE_SURFACE_COMPATIBILITY_SUPPORTED_ANGLE
      attribute set to EGL_TRUE."
  
  Changes to Chapter 3 of the EGL 1.5 Specification (EGL Functions and Errors)
  
      Modify the fourth paragraph of Section 3.5.1, page 32
      (Creating On-Screen rendering Surfaces)
  
      "<attrib_list> specifies a list of attributes for the window. The list has
      the same structure as described for eglChooseConfig. Attributes that can
      be specified in <attrib_list> include
      EGL_FLEXIBLE_SURFACE_COMPATIBILITY_SUPPORTED_ANGLE, EGL_GL_COLORSPACE,
      EGL_RENDER_BUFFER, EGL_VG_COLORSPACE, and EGL_VG_ALPHA_FORMAT."
  
      Add the following between paragraphs 6 and 7 of Section 3.5.1, page 32
      (Creating On-Screen Rendering Surfaces)
  
      "EGL_FLEXIBLE_SURFACE_COMPATIBILITY_SUPPORTED_ANGLE specifies whether the
      surface can be made current with a context with a config of different bit
      depth. Its values can be EGL_TRUE, in which case that is supported, or
      EGL_FALSE, in which case that is not supported."
  
      Modify the fourth paragraph of Section 3.5.2, page 35
      (Creating Off-Screen Rendering Surfaces)
  
      "<attrib_list> specifies a list of attributes for the pbuffer. The list
      has the same structure as described for eglChooseConfig. Attributes that
      can be specified in <attrib_list> include EGL_WIDTH, EGL_HEIGHT,
      EGL_LARGEST_PBUFFER, EGL_TEXTURE_FORMAT, EGL_TEXTURE_TARGET,
      EGL_MIPMAP_TEXTURE, EGL_GL_COLORSPACE, EGL_VG_COLORSPACE,
      EGL_FLEXIBLE_SURFACE_COMPATIBILITY_SUPPORTED_ANGLE, and
      EGL_VG_ALPHA_FORMAT."
  
      Modify paragraph twelve of Section 3.5.2, page 36
  
      "EGL_GL_COLORSPACE, EGL_VG_COLORSPACE,
      EGL_FLEXIBLE_SURFACE_COMPATIBILITY_SUPPORTED_ANGLE, and
      EGL_VG_ALPHA_FORMAT have the same meaning and default values as when used
      with eglCreatePlatformWindowSurface."
  
      Modify the fifth paragraph of Section 3.5.3, page 37
      (Binding Off-Screen Rendering Surfaces To Client Buffers)
  
      "<attrib_list> specifies a list of attributes for the pbuffer. The list
      has the same structure as described for eglChooseConfig. Attributes that
      can be specified in <attrib_list> include EGL_TEXTURE_FORMAT,
      EGL_TEXTURE_TARGET, EGL_- MIPMAP_TEXTURE, and
      EGL_FLEXIBLE_SURFACE_COMPATIBILITY_SUPPORTED_ANGLE. The meaning of these
      attributes is as described above for eglCreatePbufferSurface. The
      EGL_VG_COLORSPACE and EGL_VG_ALPHA_FORMAT attributes of the surface are
      determined by the VGImageFormat of buffer."
  
      Add the following entry to Table 3.5, page 44 (Queryable surface
      attributes and types)
  
      Attribute                                          Type    Description
      -------------------------------------------------- ------- ------------------------
      EGL_FLEXIBLE_SURFACE_COMPATIBILITY_SUPPORTED_ANGLE boolean Surface can be made
                                                                 current with contexts
                                                                 of a different bit depth
  
  Issues
  
      None
  
  Revision History
  
      Version 3, Dec 15, 2015 (John Bauman)
          - Modify EGL_FLEXIBLE_SURFACE_COMPATIBILITY_SUPPORTED_ANGLE value.
  
      Version 2, Dec 1, 2015 (John Bauman)
          - Add EGL_FLEXIBLE_SURFACE_COMPATIBILITY_SUPPORTED_ANGLE to specify
            new behavior.
  
      Version 1, Nov 24, 2015 (John Bauman)
          - Initial Draft
  

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