[Mesa-dev] [Piglit] [RFC PATCH] arb_texture_barrier: call glTextureBarrier after each glDrawRangeElements

[Grazvydas Ignotas]

On Sat, Jun 25, 2016 at 4:54 PM, Alejandro Piñeiro <apinheiro at igalia.com> wrote:
> In theory they don't overdrawn. The test has a square formed by N
> non-overlapping triangles. With just one call to glDrawRangeElements,
> this always works. But if we split it in M subsets, so M calls to
> glDrawRangeElements with N/M triangles per call, with low resolutions
> and a high amount of triangles, some texels start to fail. And not
> always the same amount of texels (so as you mentioned, undefined
> territory). Although it is a guess, I assume that is cause for artifacts
> on the triangle borders when drawing with so low resolution.

Perhaps this is somehow related to this bug:
https://bugs.freedesktop.org/show_bug.cgi?id=96624
There a texture problem shows up after one of glDrawRangeElements
calls with a lot of primitives.

Gražvydas