[Mesa-dev] [Mesa-stable] [PATCH] anv/blit: Use CLAMP_TO_EDGE for scaled blits

[Ian Romanick]

I believe this is what GL meta blits do also.  This patch is

Reviewed-by: Ian Romanick <ian.d.romanick at intel.com>

On 06/02/2016 04:36 PM, Jason Ekstrand wrote:
> When upscaling you can end up interpolating between the edge pixel and one
> past the edge.  Using CLAMP_TO_EDGE seems like the most reasonable thing to
> do in this case.  This fixes two of the new Vulkan CTS tests in
> dEQP-VK.api.copy_and_blit.blit_image.*
> 
> Jason Ekstrand <jason at jlekstrand.net>
> Cc: "12.0" <mesa-stable at lists.freedesktop.org>
> ---
>  src/intel/vulkan/anv_meta_blit.c | 3 +++
>  1 file changed, 3 insertions(+)
> 
> diff --git a/src/intel/vulkan/anv_meta_blit.c b/src/intel/vulkan/anv_meta_blit.c
> index 3c54ef4..dc098ef 100644
> --- a/src/intel/vulkan/anv_meta_blit.c
> +++ b/src/intel/vulkan/anv_meta_blit.c
> @@ -211,6 +211,9 @@ meta_emit_blit(struct anv_cmd_buffer *cmd_buffer,
>           .sType = VK_STRUCTURE_TYPE_SAMPLER_CREATE_INFO,
>           .magFilter = blit_filter,
>           .minFilter = blit_filter,
> +         .addressModeU = VK_SAMPLER_ADDRESS_MODE_CLAMP_TO_EDGE,
> +         .addressModeV = VK_SAMPLER_ADDRESS_MODE_CLAMP_TO_EDGE,
> +         .addressModeW = VK_SAMPLER_ADDRESS_MODE_CLAMP_TO_EDGE,
>        }, &cmd_buffer->pool->alloc, &sampler);
>  
>     VkDescriptorPool desc_pool;
>