Bug 94713

Summary:	[Gen8+] ES 3.1 Stencil texturing broken for 2DArray/Cubes
Product:	Mesa	Reporter:	Kenneth Graunke <kenneth>
Component:	Drivers/DRI/i965	Assignee:	Kenneth Graunke <kenneth>
Status:	RESOLVED FIXED	QA Contact:	Intel 3D Bugs Mailing List <intel-3d-bugs>
Severity:	normal
Priority:	medium	CC:	topi.pohjolainen
Version:	git
Hardware:	Other
OS:	All
Whiteboard:
i915 platform:		i915 features:
Bug Depends on:
Bug Blocks:	94448

Description Kenneth Graunke 2016-03-26 09:22:49 UTC

dEQP-GLES31.functional.stencil_texturing.format.stencil_index8_2d_array and
dEQP-GLES31.functional.stencil_texturing.format.stencil_index8_cube both fail on Broadwell.  These tests simply create a stencil texture, then draw using a shader that samples from it.  Something about multi-layered textures breaks.

No crazy blitting or packed depth/stencil stuff is involved - we simply have a S8 texture and rely on the sampler's W-tiling capabilities.

Comment 1 Kenneth Graunke 2016-03-26 09:24:06 UTC

CC'ing Topi just in case he's bored (not likely!) and knows the solution already.

Comment 2 Ian Romanick 2016-04-12 21:34:08 UTC

See also bug #93704.

Comment 3 Kenneth Graunke 2016-04-26 09:57:20 UTC

I have patches for this.

Comment 4 Kenneth Graunke 2016-04-27 18:06:29 UTC

Fixed by

commit 1e44599a43f6e9e35c4e951d55897c4e5a750fb9
Author: Kenneth Graunke <kenneth@whitecape.org>
Date:   Tue Apr 26 01:44:51 2016 -0700

    i965: Fix MapTextureImage for multi-slice/level stencil buffers.

and

commit fd9a7d8f30e8a4f73c7973a9d4e59082ecb5c1bf
Author: Kenneth Graunke <kenneth@whitecape.org>
Date:   Thu Mar 3 01:58:13 2016 -0800

    i965: Enable ARB_texture_stencil8 and OES_texture_stencil8 on Gen8+.

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