On Fri, Dec 1, 2017 at 5:20 PM, Jason Ekstrand <[email protected]> wrote:
> We've had this optimization in the GL driver since July but never got
> around to hooking it up in Vulkan. This lets us turn UBOs into push
> constants which are significantly faster since they read the UBO data
> once and the shader dispatch shoves it into the shader prior to program
> execution.
>
> I have zero benchmark numbers at the moment but I expect this to help
> anything which uses UBOs and has constant offsets into them which is
> basically everything. Unfortunately, I'm at home and not near any
> hardware with stable enough performance characteristics to get decent
> numbers today.
>
I have numbers now (which I have added to the commit message on the last
patch:
On my SKL GT4e, this improves the performance of Dota 2 and Talos by
around 2.5% and improves Aztec Ruins by around 2%.
> Cc: Kenneth Graunke <[email protected]>
> Cc: Eero Tamminen <[email protected]>
>
> Jason Ekstrand (6):
> anv/pipeline: Translate vulkan_resource_index to a constant when
> possible
> anv/cmd_buffer: Add some helpers for working with descriptor sets
> anv/cmd_buffer: Add some stage asserts
> anv/cmd_buffer: Add support for pushing UBO ranges
> anv/device: Increase the UBO alignment requirement to 32
> anv: Enable UBO pushing
>
> src/intel/vulkan/anv_device.c | 13 +-
> src/intel/vulkan/anv_nir_apply_pipeline_layout.c | 15 +-
> src/intel/vulkan/anv_pipeline.c | 6 +
> src/intel/vulkan/genX_cmd_buffer.c | 191
> ++++++++++++++++++-----
> src/intel/vulkan/genX_pipeline.c | 3 +-
> 5 files changed, 179 insertions(+), 49 deletions(-)
>
> --
> 2.5.0.400.gff86faf
>
>
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