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XXX - Obsolete; implemented as part of GL_SGIX_igloo_interface
This not an EXT, SGI, SGIS, or SGIX extension. It violates the prefix rules.
Also the XXX violates the no-caps in the body of the name rule.
Name Strings
These strings should never be returned by glGetString,
because I don't expect the get in this extension to be implemented
The extension should remain incomplete.
The name string here is used solely in the registry.
$Date: 1999/04/03 08:40:52 $ $Revision: 1.2 $
Do we number these???
This extension has *NO* dependencies.
When Viewport_Offset is enabled then the viewport transformation is becomes
x_w = (p_x/2) x_d + o_x + 0.5
y_w = (p_y/2) y_d + o_y + 0.5
z_w = . . . same as before.
I believe that this is only useful for emulating IrisGL on top of OpenGL.
New Procedures and Functions
There are no new Procedures for this extension
New Tokens
* This list should be complete. It should separate the new tokens
* based on which procedures and parameters accept them, and explicitly
* list those procedures and parameters. Token suffixes must match the
* prefix chosen for the extension name. For example:
* Accepted by the <pname> parameters of GetBooleanv, GetIntegerv,
* GetFloatv, and GetDoublev:
IGLOO_OFFSET_VIEWPORT_XXX Is accepted by glEnable and glDisable.
Probably not accepted by the <pname> parameter of glGetBooleanv, and
(I do not expect glGet to accept this in most implementations,
but techically it should since this is user state.)
If glEnable or glDisable generates an INVALID_ENUM then
this extension is not available.
Additions to Chapter 2 of the 1.0 Specification (OpenGL Operation)
Section 2.9.1 (Controlling the viewport)
now reads:
"The vertex's window coordinates, (x_w) are given by
(x_w) ((p_x/2)x_d + o_x + offset) )
(y_w) = ((p_y/2)y_d + o_y + offset) )
(z_w) ([unchanged from versions 1.0]) )
where offset equals 0.5 if IGLOO_OFFSET_VIEWPORT_XXX is enabled, and 0.0 if it is
Additions to Chapter 3 of the 1.0 Specification (Rasterization)
Additions to Chapter 4 of the 1.0 Specification (Per-Fragment Operations
and the Frame Buffer)
Additions to Chapter 5 of the 1.0 Specification (Special Functions)
* List commands that are not included in display lists (typically Get*
* commands)
glGet(IGLOO_OFFSET_VIEWPORT_XXX) will probably not be part of any real implementation.
glEnable is already display listable and remains so.
Additions to Chapter 6 of the 1.0 Specification (State and State Requests)
There is one new bit of state.
This bit is TRUE if IGLOO_OFFSET_VIEWPORT_XXX is enabled
and FALSE otherwise. While this is technically user state, it is not
needed by IGLOO. . .
It's default value is FALSE.
Additions to the GLX Specification
No additions are needed for the GLX Specification
There is no new Error state, but glEnable/glDisable now accepts a the new token.
New State
* Description of all state values in table format. Note that client
* state should have "client" listed in the Attrib column.
Get Value Get Command Type Value Attrib
--------- ----------- ---- ------- ------