[Mesa-stable] [PATCH] i965: Adjust fast-clear resolve rect for BDW

[Kristian Høgsberg]

The scale factors for the resolve rectangle change for BDW and we have
to look at bdw->gen now to figure out how big it should be.

Fixes: https://bugs.freedesktop.org/attachment.cgi?id=105777
Cc: "10.3" <mesa-stable at lists.freedesktop.org>
Signed-off-by: Kristian Høgsberg <krh at bitplanet.net>
Reviewed-by: Kenneth Graunke <kenneth at whitecape.org>
---
 src/mesa/drivers/dri/i965/brw_meta_fast_clear.c | 14 ++++++++++----
 1 file changed, 10 insertions(+), 4 deletions(-)

diff --git a/src/mesa/drivers/dri/i965/brw_meta_fast_clear.c b/src/mesa/drivers/dri/i965/brw_meta_fast_clear.c
index 7816140..6415ccf 100644
--- a/src/mesa/drivers/dri/i965/brw_meta_fast_clear.c
+++ b/src/mesa/drivers/dri/i965/brw_meta_fast_clear.c
@@ -640,13 +640,19 @@ get_resolve_rect(struct brw_context *brw,
     *     with respect to render target being resolved.
     *
     * The scaledown factors in the table that follows are related to the
-    * alignment size returned by intel_get_non_msrt_mcs_alignment(), but with
-    * X and Y alignment each divided by 2.
+    * alignment size returned by intel_get_non_msrt_mcs_alignment() by a
+    * multiplier.  For IVB and HSW, we divide by two, for BDW we multiply
+    * by 8 and 16.
     */
 
    intel_get_non_msrt_mcs_alignment(brw, mt, &x_align, &y_align);
-   x_scaledown = x_align / 2;
-   y_scaledown = y_align / 2;
+   if (brw->gen >= 8) {
+      x_scaledown = x_align * 8;
+      y_scaledown = y_align * 16;
+   } else {
+      x_scaledown = x_align / 2;
+      y_scaledown = y_align / 2;
+   }
    rect->x0 = rect->y0 = 0;
    rect->x1 = ALIGN(mt->logical_width0, x_scaledown) / x_scaledown;
    rect->y1 = ALIGN(mt->logical_height0, y_scaledown) / y_scaledown;
-- 
1.9.3