[Mesa-stable] [Mesa-dev] [PATCH] radv: fix DCC enablement since partial MSAA implementation

[Bas Nieuwenhuizen]

Oops.

Reviewed-by: Bas Nieuwenhuizen <bas at basnieuwenhuizen.nl>

On Wed, Apr 25, 2018 at 10:56 AM, Samuel Pitoiset
<samuel.pitoiset at gmail.com> wrote:
> dcc_msaa_allowed is always false on GFX9+ and only true on VI
> if RADV_PERFTEST=dccmsaa is set. This means DCC was disabled
> in some situations where it should not.
>
> This is likely going to fix a performance regression.
>
> Fixes: 2f63b3dd09 ("radv: enable DCC for MSAA 2x textures on VI under an option")
> Cc: 18.1 <mesa-stable at lists.freedesktop.org>
> Signed-off-by: Samuel Pitoiset <samuel.pitoiset at gmail.com>
> ---
>  src/amd/vulkan/radv_image.c | 12 ++++++------
>  1 file changed, 6 insertions(+), 6 deletions(-)
>
> diff --git a/src/amd/vulkan/radv_image.c b/src/amd/vulkan/radv_image.c
> index 348f4c7b34..793f861f4f 100644
> --- a/src/amd/vulkan/radv_image.c
> +++ b/src/amd/vulkan/radv_image.c
> @@ -133,12 +133,12 @@ radv_use_dcc_for_image(struct radv_device *device,
>         if (create_info->scanout)
>                 return false;
>
> -       /* FIXME: DCC for MSAA with 4x and 8x samples doesn't work yet. */
> -       if (pCreateInfo->samples > 2)
> -               return false;
> -
> -       /* TODO: Enable DCC for MSAA textures. */
> -       if (!device->physical_device->dcc_msaa_allowed)
> +       /* FIXME: DCC for MSAA with 4x and 8x samples doesn't work yet, while
> +        * 2x can be enabled with an option.
> +        */
> +       if (pCreateInfo->samples > 2 ||
> +           (pCreateInfo->samples == 2 &&
> +            !device->physical_device->dcc_msaa_allowed))
>                 return false;
>
>         /* Determine if the formats are DCC compatible. */
> --
> 2.17.0
>
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