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GL_NV_vertex_array_range2
homeprevnext Name
  
    NV_vertex_array_range2  
  
homeprevnext Name Strings
  
    GL_NV_vertex_array_range2  
  
homeprevnext Contact
  
    Mark J. Kilgard, NVIDIA Corporation (mjk 'at' nvidia.com)  
  
homeprevnext Notice
  
    Copyright NVIDIA Corporation, 2001.  
  
homeprevnext IP Status
  
    NVIDIA Proprietary.  
  
homeprevnext Status
  
    Complete  
  
homeprevnext Version
  
    NVIDIA Date: April 13, 2001  
    $Date: 2001/04/13 $ $Revision: #2 $  
    $Id: //sw/main/docs/OpenGL/specs/GL_NV_vertex_array_range2.txt#2 $  
  
homeprevnext Number
  
    232  
  
homeprevnext Dependencies
  
    Assumes support for the NV_vertex_array_range extension (version 1.1).  
  
    Support for NV_fence is recommended but not required.  
  
homeprevnext Overview
  
    Enabling and disabling the vertex array range is specified by the  
    original NV_vertex_array_range extension specification to flush the  
    vertex array range implicitly.  In retrospect, this semantic is  
    extremely misconceived and creates terrible performance problems  
    for any application that wishes to mix conventional vertex arrays  
    with vertex arrange range-enabled vertex arrays.  
  
    This extension provides a new token for enabling/disabling the  
    vertex array range that does NOT perform an implicit vertex array  
    range flush when the enable/disable is performed.  
  
homeprevnext Issues
  
    Should this extension expose a new enable that enables/disables the  
    vertex array range enable/disable semantic of performing an implicit  
    'vertex array range flush' when GL_VERTEX_ARRAY_RANGE_NV is enabled  
    or disabled, OR should it add a new enable token that acts identically  
    to GL_VERTEX_ARRAY_RANGE_NV without the implicit flush?  
  
      RESOLUTION:  The second option.  Enabling/disabling  
      GL_VERTEX_ARRAY_RANGE_WITHOUT_FLUSH_NV acts identically to  
      enabling/disabling GL_VERTEX_ARRAY_RANGE_NV, just without the  
      implicit flush.  
  
    Should GL_VERTEX_ARRAY_RANGE_WITHOUT_FLUSH_NV work with glIsEnabled?  
  
      RESOLUTION:  NO.  There is still just a single state boolean to  
      query.  
  
homeprevnext New Procedures and Functions
  
    None  
  
homeprevnext New Tokens
  
    Accepted by the <cap> parameter of EnableClientState,  
    DisableClientState:  
  
        VERTEX_ARRAY_RANGE_WITHOUT_FLUSH_NV  0x8533  
  
homeprevnext Additions to Chapter 2 of the OpenGL 1.1 Specification (OpenGL Operation)
  
    Within the discussion of vertex arrays (Section 2.8) amended by  
    the NV_vertex_array_range extension specification, change the  
    discussion of enabling the vertex array range to:  
  
    The vertex array range is enabled or disabled by calling  
    EnableClientState or DisableClientState with the symbolic  
    constant VERTEX_ARRAY_RANGE_NV.   
  
    The vertex array range is also enabled or disabled by calling  
    EnableClientState or DisableClientState with the symbolic constant  
    VERTEX_ARRAY_RANGE_WITHOUT_FLUSH_NV.  This second means to enable  
    and disable the vertex array range does not perform an implicit  
    vertex array range flush as described subsequently."  
  
    Within the discussion of vertex arrays (Section 2.8) amended by the  
    NV_vertex_array_range extension specification, change the discussion  
    of implicit vertex array range flushes to:  
  
    "A 'vertex array range flush' occurs when one of the following  
    operations occur:  
  
       o  Finish returns.  
  
       o  FlushVertexArrayRangeNV returns.  
  
       o  VertexArrayRangeNV returns.  
  
       o  DisableClientState of VERTEX_ARRAY_RANGE_NV returns.  
  
       o  EnableClientState of VERTEX_ARRAY_RANGE_NV returns.  
  
       o  Another OpenGL context is made current.  
  
    However, use of VERTEX_ARRAY_RANGE_WITHOUT_FLUSH_NV with  
    DisableClientState or EnableClientState does NOT perform an implicit  
    vertex array range flush."  
  
homeprevnext Additions to Chapter 5 of the OpenGL 1.1 Specification (Special Functions)
  
    None  
  
homeprevnext Additions to the WGL interface:
  
    None  
  
homeprevnext Additions to the GLX Specification
  
    None  
  
homeprevnext GLX Protocol
  
    None  
  
homeprevnext Errors
  
    No new errors.  
  
homeprevnext New State
  
    None  
  
homeprevnext New Implementation Dependent State
  
    None  
  
homeprevnext Revision History
  
    4/13/2001 - token value for GL_VERTEX_ARRAY_RANGE_WITHOUT_FLUSH_NV  
    should be 0x8533 (was incorrectly typed as 0x8503)  
  
  
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