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radeonsi: work around an MSAA fast stencil clear problem

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A piglit test (arb_texture_multisample-stencil-clear) has been sent.
This problem was discovered analyzing

Bugzilla: https://bugs.freedesktop.org/show_bug.cgi?id=93767
Reviewed-by: Marek Olšák <marek.olsak@amd.com>
This commit is contained in:
Nicolai Hähnle 2016-04-22 17:28:46 -05:00
parent 7a215a3e27
commit 8c43c06e04
1 changed files with 15 additions and 3 deletions
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18
src/gallium/drivers/radeonsi/si_state.c
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@ -2383,9 +2383,21 @@ static void si_init_depth_surface(struct si_context *sctx,
z_info |= S_028040_TILE_SURFACE_ENABLE(1) |
S_028040_ALLOW_EXPCLEAR(1);
if (rtex->surface.flags & RADEON_SURF_SBUFFER)
s_info |= S_028044_ALLOW_EXPCLEAR(1);
else
if (rtex->surface.flags & RADEON_SURF_SBUFFER) {
/* Workaround: For a not yet understood reason, the
* combination of MSAA, fast stencil clear and stencil
* decompress messes with subsequent stencil buffer
* uses. Problem was reproduced on Verde, Bonaire,
* Tonga, and Carrizo.
*
* Disabling EXPCLEAR works around the problem.
*
* Check piglit's arb_texture_multisample-stencil-clear
* test if you want to try changing this.
*/
if (rtex->resource.b.b.nr_samples <= 1)
s_info |= S_028044_ALLOW_EXPCLEAR(1);
} else
/* Use all of the htile_buffer for depth if there's no stencil. */
s_info |= S_028044_TILE_STENCIL_DISABLE(1);