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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