[PATCH v2 1/3] etnaviv: support tile aligned RS blits

[Lucas Stach]

The RS can blit abitrary tile aligned subregions of a resource by
adjusting the buffer offset.

Signed-off-by: Lucas Stach <l.stach at pengutronix.de>
---
v2:
- add asserts, so we catch any invalid use of the RS
- split out tile mask computation, to make it easier to read the code
---
 src/gallium/drivers/etnaviv/etnaviv_clear_blit.c | 86 +++++++++++++++++++++---
 1 file changed, 78 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..8030450dd1b0 100644
--- a/src/gallium/drivers/etnaviv/etnaviv_clear_blit.c
+++ b/src/gallium/drivers/etnaviv/etnaviv_clear_blit.c
@@ -358,6 +358,59 @@ 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 int x = box->x, y = box->y;
+   unsigned int blocksize = util_format_get_blocksize(format);
+
+   switch (layout) {
+   case ETNA_LAYOUT_LINEAR:
+      offset = y * stride + x * blocksize;
+      break;
+   case ETNA_LAYOUT_MULTI_TILED:
+      y >>= 1;
+      /* fall-through */
+   case ETNA_LAYOUT_TILED:
+      assert(!(x & 0x03) && !(y & 0x03));
+      offset = (y & ~0x03) * stride + blocksize * ((x & ~0x03) << 2);
+      break;
+   case ETNA_LAYOUT_MULTI_SUPERTILED:
+      y >>= 1;
+      /* fall-through */
+   case ETNA_LAYOUT_SUPER_TILED:
+      assert(!(x & 0x3f) && !(y & 0x3f));
+      offset = (y & ~0x3f) * stride + blocksize * ((x & ~0x3f) << 6);
+      break;
+   default:
+      unreachable("invalid resource layout");
+   }
+
+   return offset;
+}
+
+static inline void
+etna_get_rs_alignment_mask(const struct etna_context *ctx,
+                           const enum etna_surface_layout layout,
+                           unsigned int *width_mask, unsigned int *height_mask)
+{
+   unsigned int h_align, w_align;
+
+   if (layout & ETNA_LAYOUT_BIT_SUPER) {
+      w_align = h_align = 64;
+   } else {
+      w_align = ETNA_RS_WIDTH_MASK + 1;
+      h_align = ETNA_RS_HEIGHT_MASK + 1;
+   }
+
+   h_align *= ctx->screen->specs.pixel_pipes;
+
+   *width_mask = w_align - 1;
+   *height_mask = h_align -1;
+}
+
 static bool
 etna_try_rs_blit(struct pipe_context *pctx,
                  const struct pipe_blit_info *blit_info)
@@ -399,14 +452,22 @@ 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;
+
+   etna_get_rs_alignment_mask(ctx, src->layout, &w_mask, &h_mask);
+   if ((blit_info->src.box.x & w_mask) || (blit_info->src.box.y & h_mask))
+      return FALSE;
+
+   etna_get_rs_alignment_mask(ctx, dst->layout, &w_mask, &h_mask);
+   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 +487,18 @@ 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);
+   unsigned dst_offset = dst_lev->offset +
+                         blit_info->dst.box.z * dst_lev->layer_stride +
+                         etna_compute_tileoffset(&blit_info->dst.box,
+                                                 blit_info->dst.format,
+                                                 dst_lev->stride,
+                                                 dst->layout);
 
    if (src_lev->padded_width <= ETNA_RS_WIDTH_MASK ||
        dst_lev->padded_width <= ETNA_RS_WIDTH_MASK ||
@@ -503,7 +572,8 @@ etna_try_rs_blit(struct pipe_context *pctx,
 
       memset(&reloc, 0, sizeof(struct etna_reloc));
       reloc.bo = src->bo;
-      reloc.offset = src_offset;
+      reloc.offset = src_lev->offset +
+                     blit_info->src.box.z * src_lev->layer_stride;
       reloc.flags = ETNA_RELOC_READ;
       etna_set_state_reloc(ctx->stream, VIVS_TS_COLOR_SURFACE_BASE, &reloc);
 
-- 
2.11.0