kc3-lang/angle/extensions/ANGLE_polygon_mode.txt

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• Hash : b7a5714f
  Author :
  Date : 2023-03-31T00:00:00
  

  Add polygon mode extension stubs
  
  * Added NV_polygon_mode
  
  * Specified a portable polygon mode extension
    implementable on all ANGLE backends
  
  Bug: angleproject:1791
  Bug: angleproject:8132
  Change-Id: I018aaaf1fb43ec16910859b152049e02169ede91
  Reviewed-on: https://chromium-review.googlesource.com/c/angle/angle/+/4492684
  Reviewed-by: Shahbaz Youssefi <syoussefi@chromium.org>
  Commit-Queue: Alexey Knyazev <lexa.knyazev@gmail.com>
  

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• extensions/ANGLE_polygon_mode.txt

• Name
  
      ANGLE_polygon_mode
  
  Name Strings
  
      GL_ANGLE_polygon_mode
  
  Status
  
      Draft
  
  Version
  
      Last Modified Date: March 31, 2023
      Revision: 1
  
  Number
  
      OpenGL ES Extension XX
  
  Dependencies
  
      This extension is written against the OpenGL ES 3.1 (November 3, 2016)
      specification, but can apply to earlier versions.
  
  Overview
  
      Rendering triangle primitives as lines, i.e., in a wireframe mode,
      is useful for debugging GPU applications.
  
      This effect cannot be achieved by drawing the same triangle primitives with
      the LINES mode due to differences in primitive assembly and rasterization.
      Moreover, polygon offset state is ignored for line primitives thus making
      the wireframe overlay even more difficult to be rendered correctly.
  
      This extension has the same semantics as NV_polygon_mode but the point
      rasterization mode is omitted to support the extension on layered OpenGL ES
      implementations, such as ANGLE, when the underlying API does not support
      point rasterization mode.
  
  New Procedures and Functions
  
      void PolygonModeANGLE(enum face, enum mode);
  
  New Tokens
  
      Accepted by the <pname> parameter to GetIntegerv:
  
          POLYGON_MODE_ANGLE                          0x0B40
  
      Accepted by the <pname> parameters of Enable, Disable and IsEnabled:
  
          POLYGON_OFFSET_LINE_ANGLE                   0x2A02
  
      Returned by GetIntegerv, GetFloatv, and GetInteger64v when <pname> is
      POLYGON_MODE_ANGLE:
  
          LINE_ANGLE                                  0x1B01
          FILL_ANGLE                                  0x1B02
  
  New State
  
      Modify Table 20.6, Rasterization
  
      Add:
  
                                            Initial
      Get Value                 Type Get Command  Value     Description                    Sec.
      -----------------------   ---- ----------- ---------- ---------------------------    ------
      POLYGON_MODE_ANGLE         E   GetIntegerv FILL_ANGLE Polygon rasterization mode     13.5.1pm
                                                            (front & back)
      POLYGON_OFFSET_LINE_ANGLE  B   IsEnabled   FALSE      Polygon offset enable for      13.5.2
                                                            LINE_ANGLE mode rasterization
  
      Change description for POLYGON_OFFSET_FILL to "Polygon offset enable for
      FILL_ANGLE mode rasterization"
  
  Errors
  
      An INVALID_ENUM error is generated by PolygonModeANGLE if <face> is not
      FRONT_AND_BACK.
  
      An INVALID_ENUM error is generated by PolygonModeANGLE if <mode> is not
      one of LINE_ANGLE or FILL_ANGLE.
  
  Revision History
  
      3/31/2023   First revision
  

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