[Nouveau] [PATCH mesa v2 1/2] nv30: Fix color resolving for nv3x cards

[Hans de Goede]

We do not have a generic blitter on nv3x cards, so we must use the
sifm object for color resolving.

This commit divides the sources and dest surfaces in to tiles which
match the constraints of the sifm object, so that color resolving
will work properly on nv3x cards.

Signed-off-by: Hans de Goede <hdegoede at redhat.com>
---
Changes in v2:
-Use 1024x1024 blocks
-Use the sifm on both nv3x and nv4x cards instead of only on nv3x cards
---
 src/gallium/drivers/nouveau/nv30/nv30_miptree.c | 38 ++++++++++++++++++++++++-
 1 file changed, 37 insertions(+), 1 deletion(-)

diff --git a/src/gallium/drivers/nouveau/nv30/nv30_miptree.c b/src/gallium/drivers/nouveau/nv30/nv30_miptree.c
index 76bb8b8..735c718 100644
--- a/src/gallium/drivers/nouveau/nv30/nv30_miptree.c
+++ b/src/gallium/drivers/nouveau/nv30/nv30_miptree.c
@@ -149,14 +149,50 @@ static void
 nv30_resource_resolve(struct nv30_context *nv30,
                       const struct pipe_blit_info *info)
 {
+   struct nv30_miptree *src_mt = nv30_miptree(info->src.resource);
    struct nv30_rect src, dst;
+   unsigned x, x0, x1, y, y1, w, h;
 
    define_rect(info->src.resource, 0, info->src.box.z, info->src.box.x,
       info->src.box.y, info->src.box.width, info->src.box.height, &src);
    define_rect(info->dst.resource, 0, info->dst.box.z, info->dst.box.x,
       info->dst.box.y, info->dst.box.width, info->dst.box.height, &dst);
 
-   nv30_transfer_rect(nv30, BILINEAR, &src, &dst);
+   x0 = src.x0;
+   x1 = src.x1;
+   y1 = src.y1;
+
+   /* On nv3x we must use sifm which is restricted to 1024x1024 tiles */
+   for (y = src.y0; y < y1; y += h) {
+      h = y1 - y;
+      if (h > 1024)
+         h = 1024;
+
+      src.y0 = 0;
+      src.y1 = h;
+      src.h = h;
+
+      dst.y1 = dst.y0 + (h >> src_mt->ms_y);
+      dst.h = h >> src_mt->ms_y;
+
+      for (x = x0; x < x1; x += w) {
+         w = x1 - x;
+         if (w > 1024)
+            w = 1024;
+
+         src.offset = y * src.pitch + x * src.cpp;
+         src.x0 = 0;
+         src.x1 = w;
+         src.w = w;
+
+         dst.offset = (y >> src_mt->ms_y) * dst.pitch +
+                      (x >> src_mt->ms_x) * dst.cpp;
+         dst.x1 = dst.x0 + (w >> src_mt->ms_x);
+         dst.w = w >> src_mt->ms_x;
+
+         nv30_transfer_rect(nv30, BILINEAR, &src, &dst);
+      }
+   }
 }
 
 void
-- 
2.4.3