[Mesa-dev] [v3 05/19] i965/gen6: Add back-to-back surface minify

[Topi Pohjolainen]

Signed-off-by: Topi Pohjolainen <topi.pohjolainen at intel.com>
---
 src/mesa/drivers/dri/i965/brw_tex_layout.c    | 25 +++++++++++++++++++++++++
 src/mesa/drivers/dri/i965/intel_mipmap_tree.h |  3 +++
 2 files changed, 28 insertions(+)

diff --git a/src/mesa/drivers/dri/i965/brw_tex_layout.c b/src/mesa/drivers/dri/i965/brw_tex_layout.c
index bfa8afa..6f65334 100644
--- a/src/mesa/drivers/dri/i965/brw_tex_layout.c
+++ b/src/mesa/drivers/dri/i965/brw_tex_layout.c
@@ -36,6 +36,7 @@
 #include "brw_context.h"
 #include "main/macros.h"
 #include "main/glformats.h"
+#include "isl/isl_priv.h"
 
 #define FILE_DEBUG_FLAG DEBUG_MIPTREE
 
@@ -662,3 +663,27 @@ brw_miptree_layout(struct brw_context *brw,
    return true;
 }
 
+/* Provide surface representing selected single level. */
+struct isl_surf
+gen6_back_to_back_minify(const struct isl_surf *surf, unsigned levels)
+{
+   struct isl_surf s = *surf;
+
+   s.logical_level0_px = isl_extent4d_minify(&surf->logical_level0_px,
+                                             surf->dim, levels);
+   s.phys_level0_sa = isl_extent4d_minify(&surf->phys_level0_sa,
+                                          surf->dim, levels);
+   s.levels = 1;
+
+   const struct isl_extent3d image_align_sa =
+      isl_surf_get_image_alignment_sa(surf);
+   const unsigned d = s.dim == ISL_SURF_DIM_3D ?
+      s.phys_level0_sa.depth : s.phys_level0_sa.array_len;
+   const unsigned aligned_h =
+      isl_align_npot(s.phys_level0_sa.height, image_align_sa.h);
+
+   const uint32_t tile_align_h = surf->tiling == ISL_TILING_W ? 64 : 32;
+   s.size = ALIGN(d * aligned_h, tile_align_h) * s.row_pitch;
+
+   return s;
+}
diff --git a/src/mesa/drivers/dri/i965/intel_mipmap_tree.h b/src/mesa/drivers/dri/i965/intel_mipmap_tree.h
index 4bc30a2..d004820 100644
--- a/src/mesa/drivers/dri/i965/intel_mipmap_tree.h
+++ b/src/mesa/drivers/dri/i965/intel_mipmap_tree.h
@@ -1005,6 +1005,9 @@ bool
 intel_miptree_sample_with_hiz(struct brw_context *brw,
                               struct intel_mipmap_tree *mt);
 
+struct isl_surf
+gen6_back_to_back_minify(const struct isl_surf *surf, unsigned levels);
+
 #ifdef __cplusplus
 }
 #endif
-- 
2.9.3