EXT_multiview_timer_query

GL_EXT_multiview_timer_query

Robert Menzel, NVIDIA Corporation (rmenzel 'at' nvidia.com)

Pat Brown, NVIDIA Corporation
James Helferty, NVIDIA Corporation
Kedarnath Thangudu, NVIDIA Corporation

Complete.

Last Modified Date:  May 13, 2019
Author Revision: 1

OpenGL Extension #536
OpenGL ES Extension #317

OpenGL 4.0 or OpenGL ES 3.2 are required.

This extension is written against the OpenGL 4.6 specification
(Core Profile) (February 2, 2019) and OpenGL ES 3.2 specification
(February 2, 2019).

OVR_multiview is required.

OVR_multiview introduced multiview rendering to OpenGL and OpenGL ES.
This extension removes one of the limitations of the OVR_multiview 
extension by allowing the use of timer queries during multiview rendering. 
OVR_multiview does not specify defined behavior for such usage
(if implemented in OpenGL or if EXT_disjoint_timer_query is present).

None.

None.

Remove the following error from section 4.3 (Time Queries) which has
been added by OVR_multiview:

"Queries where BeginQuery or EndQuery is called with a target of
TIME_ELAPSED, or a if QueryCounter is called with a target of TIMESTAMP
return undefined values if the draw framebuffer is multiview at any
point during their execution."

Modify the subsection 9.2.2.2 (Multiview Images) which has been added by 
OVR_multiview:

Remove from the list of restrictions ("In this mode there are several 
restrictions:") the following item:

"- no timer queries (section 4.3)".

(1) This extension is based on an OVR extension, why call it EXT?

While started as a single vendor extension, OVR_multiview and OVR_multiview2
are already supported by multiple vendors. This new extension also has the 
support from multiple vendors to be specified as EXT.

  Rev.    Date    Author    Changes
  ----  --------  --------  -----------------------------------------
    1   05/13/19  rmenzel   Initial version.