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

[Samuel Pitoiset]

On 04/25/2018 05:10 PM, Bas Nieuwenhuizen wrote:
> Oops.

Yes, 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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