Mesa (master): nouveau: Fix swizzling for copies to rectangular textures

[Younes Manton]

Module: Mesa
Branch: master
Commit: cb9214f33030e1f482d59049c239f20061d24ad8
URL:    http://cgit.freedesktop.org/mesa/mesa/commit/?id=cb9214f33030e1f482d59049c239f20061d24ad8

Author: Luca Barbieri <luca at luca-barbieri.com>
Date:   Sat Dec 26 07:35:17 2009 +0100

nouveau: Fix swizzling for copies to rectangular textures

nVidia hardware seems to swizzle rectangular texture (with width !=
height) coordinates by swizzling the lower bits and then adding the
higher bits from the larger dimension.
However, nv04_swizzle_bits ignores width and height and just
interleaves everything.
This causes problems with rectangular POT textures with height or
width 2048 or 4096 (but not 2048x1024 where it works by chance) since
the driver swizzles them in 1024x1024 chunks and gets the start
position for the non-first chunks wrong.
The following patch seems to fix those problems.

---

 src/gallium/drivers/nv04/nv04_surface_2d.c |   15 ++++++++++++---
 1 files changed, 12 insertions(+), 3 deletions(-)

diff --git a/src/gallium/drivers/nv04/nv04_surface_2d.c b/src/gallium/drivers/nv04/nv04_surface_2d.c
index 819f45e..40b538f 100644
--- a/src/gallium/drivers/nv04/nv04_surface_2d.c
+++ b/src/gallium/drivers/nv04/nv04_surface_2d.c
@@ -77,7 +77,7 @@ nv04_scaled_image_format(enum pipe_format format)
 }
 
 static INLINE unsigned
-nv04_swizzle_bits(unsigned x, unsigned y)
+nv04_swizzle_bits_square(unsigned x, unsigned y)
 {
 	unsigned u = (x & 0x001) << 0 |
 	             (x & 0x002) << 1 |
@@ -107,6 +107,15 @@ nv04_swizzle_bits(unsigned x, unsigned y)
 	return v | u;
 }
 
+/* rectangular swizzled textures are linear concatenations of swizzled square tiles */
+static INLINE unsigned
+nv04_swizzle_bits(unsigned x, unsigned y, unsigned w, unsigned h)
+{
+	unsigned s = MIN2(w, h);
+	unsigned m = s - 1;
+	return (((x | y) & ~m) * s) | nv04_swizzle_bits_square(x & m, y & m);
+}
+
 static int
 nv04_surface_copy_swizzle(struct nv04_surface_2d *ctx,
 			  struct pipe_surface *dst, int dx, int dy,
@@ -159,10 +168,10 @@ nv04_surface_copy_swizzle(struct nv04_surface_2d *ctx,
 	    sub_w = MIN2(sub_w, w - x);
 
 	    /* Must be 64-byte aligned */
-	    assert(!((dst->offset + nv04_swizzle_bits(dx+x, dy+y) * util_format_get_blocksize(dst->texture->format)) & 63));
+	    assert(!((dst->offset + nv04_swizzle_bits(dx+x, dy+y, w, h) * util_format_get_blocksize(dst->texture->format)) & 63));
 
 	    BEGIN_RING(chan, swzsurf, NV04_SWIZZLED_SURFACE_OFFSET, 1);
-	    OUT_RELOCl(chan, dst_bo, dst->offset + nv04_swizzle_bits(dx+x, dy+y) * util_format_get_blocksize(dst->texture->format),
+	    OUT_RELOCl(chan, dst_bo, dst->offset + nv04_swizzle_bits(dx+x, dy+y, w, h) * util_format_get_blocksize(dst->texture->format),
                              NOUVEAU_BO_GART | NOUVEAU_BO_VRAM | NOUVEAU_BO_WR);
 
 	    BEGIN_RING(chan, sifm, NV04_SCALED_IMAGE_FROM_MEMORY_COLOR_CONVERSION, 9);