Bug 98106

Summary:	Primitive restart should be disabled for Draw commands when GL >= 4.5
Product:	Mesa	Reporter:	Martina Kollarova <martina.kollarova>
Component:	Mesa core	Assignee:	Martina Kollarova <martina.kollarova>
Status:	RESOLVED WONTFIX	QA Contact:	mesa-dev
Severity:	normal
Priority:	medium	CC:	wickmarkus
Version:	11.2
Hardware:	Other
OS:	All
Whiteboard:
i915 platform:		i915 features:

Description Martina Kollarova 2016-10-06 08:52:31 UTC

Originally reported on #dri-devel by user degasus.

OpenGL spec < 4.5 has a line in the "Primitive Restart" section:

  If PRIMITIVE_RESTART_FIXED_INDEX is enabled, primitive restart is not
  performed for array elements transferred by any drawing command not taking a
  type parameter, including all of the *Draw* commands other than *DrawElements*.

OpenGL spec 4.5 has a modification:

  Note that primitive restart is not performed for array elements transferred by
  any drawing command not taking a type parameter, including all of the *Draw*
  commands other than *DrawElements*.

The current implementation doesn't take the new version into consideration, and an additional condition for GL > 4.5 should be created.

Comment 1 Martina Kollarova 2016-10-10 12:21:29 UTC

Closing as WONTFIX, see discussion in https://lists.freedesktop.org/archives/mesa-dev/2016-October/130834.html. In short, the ctx->Version field shows the highest supported context, not the version of the current one. The meaning of the spec change is apparently also not clear...

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