[Mesa-dev] [PATCH 14/33] intel/blorp: Add an entrypoint for doing bit-for-bit copies

Pohjolainen, Topi topi.pohjolainen at gmail.com
Sat Sep 3 07:14:49 UTC 2016


On Wed, Aug 31, 2016 at 02:22:33PM -0700, Jason Ekstrand wrote:
> ---
>  src/intel/blorp/blorp.h      |  10 ++++
>  src/intel/blorp/blorp_blit.c | 133 +++++++++++++++++++++++++++++++++++++++++++

So the idea is to copy a compression block as a pixel (by choosing large
enough format), right? And this is only for compression schemes that do not
use auxiliary buffers?

A few small comments further down.

>  2 files changed, 143 insertions(+)
> 
> diff --git a/src/intel/blorp/blorp.h b/src/intel/blorp/blorp.h
> index c1e93fd..6574124 100644
> --- a/src/intel/blorp/blorp.h
> +++ b/src/intel/blorp/blorp.h
> @@ -109,6 +109,16 @@ blorp_blit(struct blorp_batch *batch,
>             uint32_t filter, bool mirror_x, bool mirror_y);
>  
>  void
> +blorp_copy(struct blorp_batch *batch,
> +           const struct blorp_surf *src_surf,
> +           unsigned src_level, unsigned src_layer,
> +           const struct blorp_surf *dst_surf,
> +           unsigned dst_level, unsigned dst_layer,
> +           uint32_t src_x, uint32_t src_y,
> +           uint32_t dst_x, uint32_t dst_y,
> +           uint32_t src_width, uint32_t src_height);
> +
> +void
>  blorp_fast_clear(struct blorp_batch *batch,
>                   const struct blorp_surf *surf,
>                   uint32_t level, uint32_t layer, enum isl_format format,
> diff --git a/src/intel/blorp/blorp_blit.c b/src/intel/blorp/blorp_blit.c
> index 3ab39a3..42a502c 100644
> --- a/src/intel/blorp/blorp_blit.c
> +++ b/src/intel/blorp/blorp_blit.c
> @@ -1685,3 +1685,136 @@ blorp_blit(struct blorp_batch *batch,
>                   dst_x0, dst_y0, dst_x1, dst_y1,
>                   mirror_x, mirror_y);
>  }
> +
> +static enum isl_format
> +get_copy_format_for_bpb(unsigned bpb)
> +{
> +   /* The choice of UNORM and UINT formats is very intentional here.  Most of
> +    * the time, we want to use a UINT format to avoid any rounding error in
> +    * the blit.  For stencil blits, R8_UINT is required by the hardware.
> +    * (It's the only format allowed in conjunction with W-tiling.)  Also we
> +    * intentionally use the 4-channel formats whenever we can.  This is so
> +    * that, when we do a RGB <-> RGBX copy, the two formats will line up even
> +    * though one of them is 3/4 the size of the other.  The choice of UNORM
> +    * vs. UINT is also very intentional because Haswell doesn't handle 8 or
> +    * 16-bit RGB UINT formats at all so we have to use UNORM there.
> +    * Fortunately, the only time we should ever use two different formats in
> +    * the table below is for RGB -> RGBA blits and so we will never have any
> +    * UNORM/UINT mismatch.
> +    */
> +   switch (bpb) {
> +   case 8:  return ISL_FORMAT_R8_UINT;
> +   case 16: return ISL_FORMAT_R8G8_UINT;
> +   case 24: return ISL_FORMAT_R8G8B8_UNORM;
> +   case 32: return ISL_FORMAT_R8G8B8A8_UNORM;
> +   case 48: return ISL_FORMAT_R16G16B16_UNORM;
> +   case 64: return ISL_FORMAT_R16G16B16A16_UNORM;
> +   case 96: return ISL_FORMAT_R32G32B32_UINT;
> +   case 128:return ISL_FORMAT_R32G32B32A32_UINT;
> +   default:
> +      unreachable("Unknown format bpb");
> +   }
> +}
> +
> +static void
> +surf_convert_to_uncompressed(const struct isl_device *isl_dev,
> +                             struct brw_blorp_surface_info *info,
> +                             uint32_t *x, uint32_t *y,
> +                             uint32_t *width, uint32_t *height)
> +{
> +   const struct isl_format_layout *fmtl =
> +      isl_format_get_layout(info->surf.format);
> +
> +   assert(fmtl->bw > 1 || fmtl->bh > 1);
> +
> +   /* This is a compressed surface.  We need to convert it to a single
> +    * slice (becase compressed layouts don't perfectly match uncompressed
 
                because

> +    * ones with the same bpb) and divide x, y, width, and height by the
> +    * block size.
> +    */
> +   surf_convert_to_single_slice(isl_dev, info);
> +
> +   if (width || height) {
> +      assert(*width % fmtl->bw == 0 ||
> +             *x + *width == info->surf.logical_level0_px.width);
> +      assert(*height % fmtl->bh == 0 ||
> +             *y + *height == info->surf.logical_level0_px.height);
> +      *width = DIV_ROUND_UP(*width, fmtl->bw);
> +      *height = DIV_ROUND_UP(*height, fmtl->bh);
> +   }
> +
> +   assert(*x % fmtl->bw == 0);
> +   assert(*y % fmtl->bh == 0);
> +   *x /= fmtl->bw;
> +   *y /= fmtl->bh;
> +
> +   info->surf.logical_level0_px.width =
> +      DIV_ROUND_UP(info->surf.logical_level0_px.width, fmtl->bw);
> +   info->surf.logical_level0_px.height =
> +      DIV_ROUND_UP(info->surf.logical_level0_px.height, fmtl->bh);
> +
> +   assert(info->surf.phys_level0_sa.width % fmtl->bw == 0);
> +   assert(info->surf.phys_level0_sa.height % fmtl->bh == 0);
> +   info->surf.phys_level0_sa.width /= fmtl->bw;
> +   info->surf.phys_level0_sa.height /= fmtl->bh;
> +
> +   assert(info->tile_x_sa % fmtl->bw == 0);
> +   assert(info->tile_y_sa % fmtl->bh == 0);
> +   info->tile_x_sa /= fmtl->bw;
> +   info->tile_y_sa /= fmtl->bh;
> +
> +   /* It's now an uncompressed surface so we need an uncompressed format */
> +   info->surf.format = get_copy_format_for_bpb(fmtl->bpb);
> +}
> +
> +void
> +blorp_copy(struct blorp_batch *batch,
> +           const struct blorp_surf *src_surf,
> +           unsigned src_level, unsigned src_layer,
> +           const struct blorp_surf *dst_surf,
> +           unsigned dst_level, unsigned dst_layer,
> +           uint32_t src_x, uint32_t src_y,
> +           uint32_t dst_x, uint32_t dst_y,
> +           uint32_t src_width, uint32_t src_height)
> +{
> +   struct blorp_params params;
> +   blorp_params_init(&params);
> +
> +   brw_blorp_surface_info_init(batch->blorp, &params.src, src_surf, src_level,
> +                               src_layer, ISL_FORMAT_UNSUPPORTED, false);
> +   brw_blorp_surface_info_init(batch->blorp, &params.dst, dst_surf, dst_level,
> +                               dst_layer, ISL_FORMAT_UNSUPPORTED, true);
> +
> +   struct brw_blorp_blit_prog_key wm_prog_key;
> +   memset(&wm_prog_key, 0, sizeof(wm_prog_key));
> +
> +   const struct isl_format_layout *src_fmtl =
> +      isl_format_get_layout(params.src.surf.format);
> +   const struct isl_format_layout *dst_fmtl =
> +      isl_format_get_layout(params.dst.surf.format);
> +
> +   params.src.view.format = get_copy_format_for_bpb(src_fmtl->bpb);
> +   if (src_fmtl->bw > 1 || src_fmtl->bh > 1) {
> +      surf_convert_to_uncompressed(batch->blorp->isl_dev, &params.src,
> +                                   &src_x, &src_y, &src_width, &src_height);
> +      wm_prog_key.need_dst_offset = true;

I think you mean wm_prog_key.need_src_offset instead?

> +   }
> +
> +   params.dst.view.format = get_copy_format_for_bpb(dst_fmtl->bpb);
> +   if (dst_fmtl->bw > 1 || dst_fmtl->bh > 1) {
> +      surf_convert_to_uncompressed(batch->blorp->isl_dev, &params.dst,
> +                                   &dst_x, &dst_y, NULL, NULL);
> +      wm_prog_key.need_dst_offset = true;
> +   }
> +
> +   /* Once both surfaces are stompped to uncompressed as needed, the
> +    * destination size is the same as the source size.
> +    */
> +   uint32_t dst_width = src_width;
> +   uint32_t dst_height = src_height;
> +
> +   do_blorp_blit(batch, &params, &wm_prog_key,
> +                 src_x, src_y, src_x + src_width, src_y + src_height,
> +                 dst_x, dst_y, dst_x + dst_width, dst_y + dst_height,
> +                 false, false);
> +}
> -- 
> 2.5.0.400.gff86faf
> 
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