[PATCH 1/3] etnaviv: support tile aligned RS blits

[Lucas Stach]

Am Dienstag, den 19.09.2017, 16:24 +0200 schrieb Wladimir J. van der
Laan:
> On Fri, Sep 15, 2017 at 06:00:52PM +0200, Lucas Stach wrote:
> > The RS can blit abitrary tile aligned subregions of a resource by
> > adjusting the buffer offset.
> 
> Thanks for doing this.
> 
> Comments inline,
> 
> > Signed-off-by: Lucas Stach <l.stach at pengutronix.de>
> > ---
> >  src/gallium/drivers/etnaviv/etnaviv_clear_blit.c | 75 +++++++++++++++++++++---
> >  1 file changed, 67 insertions(+), 8 deletions(-)
> > 
> > diff --git a/src/gallium/drivers/etnaviv/etnaviv_clear_blit.c b/src/gallium/drivers/etnaviv/etnaviv_clear_blit.c
> > index 92c91073434a..6734968ee4ed 100644
> > --- a/src/gallium/drivers/etnaviv/etnaviv_clear_blit.c
> > +++ b/src/gallium/drivers/etnaviv/etnaviv_clear_blit.c
> > @@ -358,6 +358,38 @@ etna_manual_blit(struct etna_resource *dst, struct etna_resource_level *dst_lev,
> >     return true;
> >  }
> >  
> > +static inline size_t
> > +etna_compute_tileoffset(const struct pipe_box *box, enum pipe_format format,
> > +                        size_t stride, enum etna_surface_layout layout)
> > +{
> > +   size_t offset;
> > +   unsigned x = box->x, y = box->y;
> > +
> > +   switch (layout) {
> > +   case ETNA_LAYOUT_LINEAR:
> > +      offset = y * stride + x * util_format_get_blocksize(format);
> > +      break;
> > +   case ETNA_LAYOUT_MULTI_TILED:
> > +      y >>= 1;
> > +      /* fall-through */
> > +   case ETNA_LAYOUT_TILED:
> > +      offset = (y & ~0x03) * stride +
> > +               util_format_get_blocksize(format) * ((x & ~0x03) << 2);
> > +      break;
> > +   case ETNA_LAYOUT_MULTI_SUPERTILED:
> > +      y >>= 1;
> > +      /* fall-through */
> > +   case ETNA_LAYOUT_SUPER_TILED:
> > +      offset = (y & ~0x3f) * stride +
> > +               util_format_get_blocksize(format) * ((x & ~0x3f) << 6);
> > +      break;
> > +   default:
> > +      unreachable("invalid resource layout");
> > +   }
> > +
> > +   return offset;
> 
> Maybe add assertions that the passed-in coordinates are really tile-aligned
> for the layout type, this could catch some bugs.

Makes a lot of sense, I'll do that.

> > +}
> > +
> >  static bool
> >  etna_try_rs_blit(struct pipe_context *pctx,
> >                   const struct pipe_blit_info *blit_info)
> > @@ -399,14 +431,32 @@ etna_try_rs_blit(struct pipe_context *pctx,
> >     unsigned dst_format = etna_compatible_rs_format(blit_info->dst.format);
> >     if (translate_rs_format(src_format) == ETNA_NO_MATCH ||
> >         translate_rs_format(dst_format) == ETNA_NO_MATCH ||
> > -       blit_info->scissor_enable || blit_info->src.box.x != 0 ||
> > -       blit_info->src.box.y != 0 || blit_info->dst.box.x != 0 ||
> > -       blit_info->dst.box.y != 0 ||
> > +       blit_info->scissor_enable ||
> >         blit_info->dst.box.depth != blit_info->src.box.depth ||
> >         blit_info->dst.box.depth != 1) {
> >        return FALSE;
> >     }
> >  
> > +   unsigned w_mask, h_mask;
> > +
> > +   if (src->layout & ETNA_LAYOUT_BIT_SUPER) {
> > +      w_mask = h_mask = 0x3f;
> > +   } else {
> > +      w_mask = ETNA_RS_WIDTH_MASK;
> > +      h_mask = ((ETNA_RS_HEIGHT_MASK + 1) * ctx->screen->specs.pixel_pipes - 1);
> > +   }
> > +   if ((blit_info->src.box.x & w_mask) || (blit_info->src.box.y & h_mask))
> > +      return FALSE;
> > +
> > +   if (dst->layout & ETNA_LAYOUT_BIT_SUPER) {
> > +      w_mask = h_mask = 0x3f;
> > +   } else {
> > +      w_mask = ETNA_RS_WIDTH_MASK;
> > +      h_mask = ((ETNA_RS_HEIGHT_MASK + 1) * ctx->screen->specs.pixel_pipes - 1);
> > +   }
> > +   if ((blit_info->dst.box.x & w_mask) || (blit_info->dst.box.y & h_mask))
> > +      return FALSE;
> > +
> >     /* Ensure that the Z coordinate is sane */
> >     if (dst->base.target != PIPE_TEXTURE_CUBE)
> >        assert(blit_info->dst.box.z == 0);
> > @@ -426,10 +476,18 @@ etna_try_rs_blit(struct pipe_context *pctx,
> >     assert(blit_info->dst.box.x + blit_info->dst.box.width <= dst_lev->padded_width);
> >     assert(blit_info->dst.box.y + blit_info->dst.box.height <= dst_lev->padded_height);
> >  
> > -   unsigned src_offset =
> > -      src_lev->offset + blit_info->src.box.z * src_lev->layer_stride;
> > -   unsigned dst_offset =
> > -      dst_lev->offset + blit_info->dst.box.z * dst_lev->layer_stride;
> > +   unsigned src_offset = src_lev->offset +
> > +                         blit_info->src.box.z * src_lev->layer_stride +
> > +                         etna_compute_tileoffset(&blit_info->src.box,
> > +                                                 blit_info->src.format,
> > +                                                 src_lev->stride,
> > +                                                 src->layout);
> 
> Maybe include the z-computation in etna_compute_tileoffset as
> well - this would be future-compatible with formats have 3D tiles instead of 
> a stack of 2D ones (thinking of ASTC).

I would like to keep this as simple as possible for now, so I'm not
really fond of adding complexity for cases that I can't test right now.

Regards,
Lucas