[Mesa-dev] [RFC PATCH 14/16] i965/gen6: Stencil/hiz needs an offset for LOD > 0

[Jordan Justen]

Since gen6 stencil only supports LOD0, we need to program an offset to
the LOD when emitting the stencil/hiz.

Signed-off-by: Jordan Justen <jordan.l.justen at intel.com>
---
 src/mesa/drivers/dri/i965/gen6_blorp.cpp     | 10 ++++++++-
 src/mesa/drivers/dri/i965/gen6_depth_state.c | 32 ++++++++++++++++++++++++++--
 2 files changed, 39 insertions(+), 3 deletions(-)

diff --git a/src/mesa/drivers/dri/i965/gen6_blorp.cpp b/src/mesa/drivers/dri/i965/gen6_blorp.cpp
index 7be8ccd..920f435 100644
--- a/src/mesa/drivers/dri/i965/gen6_blorp.cpp
+++ b/src/mesa/drivers/dri/i965/gen6_blorp.cpp
@@ -872,13 +872,21 @@ gen6_blorp_emit_depth_stencil_config(struct brw_context *brw,
    /* 3DSTATE_HIER_DEPTH_BUFFER */
    {
       struct intel_mipmap_tree *hiz_mt = params->depth.mt->hiz_mt;
+      uint32_t offset = 0;
+
+      if (hiz_mt->array_spacing_lod0) {
+         offset = intel_miptree_get_aligned_offset(hiz_mt,
+                                                   hiz_mt->level[lod].level_x,
+                                                   hiz_mt->level[lod].level_y,
+                                                   false);
+      }
 
       BEGIN_BATCH(3);
       OUT_BATCH((_3DSTATE_HIER_DEPTH_BUFFER << 16) | (3 - 2));
       OUT_BATCH(hiz_mt->pitch - 1);
       OUT_RELOC(hiz_mt->bo,
                 I915_GEM_DOMAIN_RENDER, I915_GEM_DOMAIN_RENDER,
-                0);
+                offset);
       ADVANCE_BATCH();
    }
 
diff --git a/src/mesa/drivers/dri/i965/gen6_depth_state.c b/src/mesa/drivers/dri/i965/gen6_depth_state.c
index 3ef2fab..8fcc0a8 100644
--- a/src/mesa/drivers/dri/i965/gen6_depth_state.c
+++ b/src/mesa/drivers/dri/i965/gen6_depth_state.c
@@ -271,12 +271,21 @@ gen6_emit_depth_stencil_hiz(struct brw_context *brw,
       /* Emit hiz buffer. */
       if (hiz) {
          struct intel_mipmap_tree *hiz_mt = depth_mt->hiz_mt;
+         uint32_t offset = 0;
+
+         if (hiz_mt->array_spacing_lod0) {
+            offset = intel_miptree_get_aligned_offset(hiz_mt,
+                                                      hiz_mt->level[lod].level_x,
+                                                      hiz_mt->level[lod].level_y,
+                                                      false);
+         }
+
 	 BEGIN_BATCH(3);
 	 OUT_BATCH((_3DSTATE_HIER_DEPTH_BUFFER << 16) | (3 - 2));
 	 OUT_BATCH(hiz_mt->pitch - 1);
 	 OUT_RELOC(hiz_mt->bo,
 		   I915_GEM_DOMAIN_RENDER, I915_GEM_DOMAIN_RENDER,
-		   0);
+		   offset);
 	 ADVANCE_BATCH();
       } else {
 	 BEGIN_BATCH(3);
@@ -288,6 +297,25 @@ gen6_emit_depth_stencil_hiz(struct brw_context *brw,
 
       /* Emit stencil buffer. */
       if (separate_stencil) {
+         uint32_t offset = 0;
+
+         if (stencil_mt->array_spacing_lod0) {
+            if (stencil_mt->format == MESA_FORMAT_S_UINT8) {
+               /* Note: we can't compute the stencil offset using
+                * intel_region_get_aligned_offset(), because stencil_region claims
+                * that the region is untiled even though it's W tiled.
+                */
+               offset =
+                  stencil_mt->level[lod].level_y * stencil_mt->pitch +
+                  stencil_mt->level[lod].level_x * 64;
+            } else {
+               offset = intel_miptree_get_aligned_offset(stencil_mt,
+                                                         stencil_mt->level[lod].level_x,
+                                                         stencil_mt->level[lod].level_y,
+                                                         false);
+            }
+         }
+
 	 BEGIN_BATCH(3);
 	 OUT_BATCH((_3DSTATE_STENCIL_BUFFER << 16) | (3 - 2));
          /* The stencil buffer has quirky pitch requirements.  From Vol 2a,
@@ -298,7 +326,7 @@ gen6_emit_depth_stencil_hiz(struct brw_context *brw,
 	 OUT_BATCH(2 * stencil_mt->pitch - 1);
 	 OUT_RELOC(stencil_mt->bo,
 		   I915_GEM_DOMAIN_RENDER, I915_GEM_DOMAIN_RENDER,
-		   0);
+		   offset);
 	 ADVANCE_BATCH();
       } else {
 	 BEGIN_BATCH(3);
-- 
2.0.0.rc4