GL_APPLE_transform_hint

XXX - Not complete yet!!!

Name

    APPLE_transform_hint

Name Strings

    GL_APPLE_transform_hint

Version

    $Date: 1999/04/03 08:41:09 $ $Revision: 1.2 $

Number

    160

Dependencies

    None

Overview

    The transform_hint extension provides a new target,
    TRANSFORM_HINT_APPLE, for the Hint procedure.  When the
    transform hint is set to FASTEST the GL may choose to 
    implement certain state dependent algebraic simplifications
    in the geometry transformation that affect the sub-pixel
    precision of the transformed vertex coordinates.  

    For example, if two polygons are rendered with identical object
    coordinates, different GL state settings, and the transform
    hint set to FASTEST, there is no gaurantee that the resulting 
    window coordinates of the two polygons will be precisely
    identical.  Therefore, precise tests of the window coordinates, 
    such as a depth test setting of EQUAL, should not be used.

    If the transform hint is set to NICEST or DONT_CARE, two polygons
    with identical object coordinates will always be transformed
    to identical window coordinates.

New Procedures and Functions

    None

New Tokens

    Accepted by the <target> parameter of Hint and the <pname>
    parameters of GetBooleanv, GetDoublev, GetFloatv and
    GetIntegerv :

    TRANSFORM_HINT_APPLE			0x85B1

Additions to Chapter 2 of the 1.1 Specification (OpenGL Operation)

    None

Additions to Chapter 3 of the 1.1 Specification (Rasterization)

    None

Additions to Chapter 4 of the 1.1 Specification (Per-Fragment Operations and the Frame Buffer)

    None

Additions to Chapter 5 of the 1.1 Specification (Special Functions)

    Section 5.6, Hints
    The second sentence should be appended with:
    "and TRANSFORM_HINT, indicating the desired quality of vertex coordinate
     transformations."

Additions to Chapter 6 of the 1.1 Specification (State and State Requests)

    Not done

Additions to the GLX Specification

GLX Protocol

    None

Errors

    None

New State

    Get Value		 Get Command Type Value	    Attrib
    -------------------- ----------- ---- --------  ------
    TRANSFORM_HINT_APPLE GetIntegerv  Z3  DONT_CARE hint

New Implementation Dependent State

    None

Implementation Support

   List of OpenGL implementations supporting the GL_APPLE_transform_hint extension

Original File

   Original text file for the GL_APPLE_transform_hint extension