anv: Enable MSAA compression

This just enables basic MSAA compression (no fast clears) for all
multisampled surfaces.  This improves the framerate of the Sascha
"multisampling" demo by 76% on my Sky Lake laptop.  Running Talos on
medium settings with 8x MSAA, this improves the framerate in the
benchmark by 80%.

Reviewed-by: Lionel Landwerlin <lionel.g.landwerlin@intel.com>
Reviewed-by: Chad Versace <chadversary@chromium.org>
This commit is contained in:
Jason Ekstrand
2017-02-17 14:14:48 -08:00
parent 42b10b175d
commit 261092f7d4
5 changed files with 36 additions and 2 deletions

View File

@@ -228,6 +228,25 @@ static void
populate_sampler_prog_key(const struct gen_device_info *devinfo,
struct brw_sampler_prog_key_data *key)
{
/* Almost all multisampled textures are compressed. The only time when we
* don't compress a multisampled texture is for 16x MSAA with a surface
* width greater than 8k which is a bit of an edge case. Since the sampler
* just ignores the MCS parameter to ld2ms when MCS is disabled, it's safe
* to tell the compiler to always assume compression.
*/
key->compressed_multisample_layout_mask = ~0;
/* SkyLake added support for 16x MSAA. With this came a new message for
* reading from a 16x MSAA surface with compression. The new message was
* needed because now the MCS data is 64 bits instead of 32 or lower as is
* the case for 8x, 4x, and 2x. The key->msaa_16 bit-field controls which
* message we use. Fortunately, the 16x message works for 8x, 4x, and 2x
* so we can just use it unconditionally. This may not be quite as
* efficient but it saves us from recompiling.
*/
if (devinfo->gen >= 9)
key->msaa_16 = ~0;
/* XXX: Handle texture swizzle on HSW- */
for (int i = 0; i < MAX_SAMPLERS; i++) {
/* Assume color sampler, no swizzling. (Works for BDW+) */