OVR_multiview2

Name

OVR_multiview2

Name Strings

GL_OVR_multiview2

Contact

Cass Everitt, Oculus (cass.everitt 'at' oculus.com)

Contributors

John Carmack, Oculus
Jan Paul van Waveren, Oculus
Jan-Harald Fredriksen, ARM
Sam Holmes, Qualcomm
Daniel Koch, NVIDIA
  

Status

Incomplete.

Version

Last Modified Date:  October 19, 2018
Author Revision: 0.5
  

Number

OpenGL Extension #479
OpenGL ES Extension #242
  

Dependencies

OpenGL 3.0 or OpenGL ES 3.0 is required.

This extension is written against the OpenGL ES Shading Language 3.00.04
specification.

This extension requires OVR_multiview.

Overview

This extension relaxes the restriction in OVR_multiview that only gl_Position
can depend on ViewID in the vertex shader.  With this change, view-dependent
outputs like reflection vectors and similar are allowed.
  

New Tokens

None.

New Procedures and Functions

None.

Modifications to The OpenGL ES Shading Language Specification, Version 3.00.04

Including the following line in a shader can be used to control the language
features described in this extension:

  #extension GL_OVR_multiview2 : <behavior>

where <behavior> is as specified in section 3.5.

A new preprocessor #define is added to the OpenGL ES Shading Language:

  #define GL_OVR_multiview2 1

If the OVR_multiview2 extension is enabled, the OVR_multiview extension
is also implicitly enabled.

Modifications to Section 7.1 "Built-in Language Variables" (as modified by
OVR_multiview):

Delete the paragraph which states:

It is a compile- or link-time error if any output variable other
than gl_Position is statically dependent on gl_ViewID_OVR. If an
output variable other than gl_Position is dynamically dependent on
gl_ViewID_OVR, the values are undefined.
  

Errors

None.

Issues

(1) Does enabling GL_OVR_multiview2 automatically enable GL_OVR_multiview?

RESOLVED: Yes. This was not specified in early drafts of the extension,
but this is the behavior of multiple implementations.
  

Revision History

  Rev.    Date    Author    Changes
  ----  --------  --------  -----------------------------------------
  0.1   03/18/15  cass      Initial draft
  0.5   10/19/18  dgkoch    Add standard boiler plate shader extension language.
                            Add issue 1 and clarify that this extension
                            implicitly enables OVR_multiview.
  