[Mesa-dev] [PATCH mesa] nv30: Fix creation of scanout buffers

[Hans de Goede]

Scanout buffers on nv30 must always be non-swizzled and have special
width alignment constraints.

These constrains have been taken from the xf86-video-nouveau
src/nv_accel_common.c: nouveau_allocate_surface() function.

nouveau_allocate_surface() applies these width constraints only when a
tiled attribute is set, which it sets for all surfaces allocated via
dri, and this "tiling" is not the same as swizzling, scanout surfaces
must be linear / have a uniform_pitch or only complete garbage is shown.

This commit fixes dri3 on nv30 showing a garbled display, with dri3 the
scanout buffers are allocated by mesa, rather then by the ddx, and the
wrong stride of these buffers was causing the garbled display.

Signed-off-by: Hans de Goede <hdegoede at redhat.com>
---
 src/gallium/drivers/nouveau/nv30/nv30_miptree.c | 10 ++++++++++
 1 file changed, 10 insertions(+)

diff --git a/src/gallium/drivers/nouveau/nv30/nv30_miptree.c b/src/gallium/drivers/nouveau/nv30/nv30_miptree.c
index c75b4b9..2276347 100644
--- a/src/gallium/drivers/nouveau/nv30/nv30_miptree.c
+++ b/src/gallium/drivers/nouveau/nv30/nv30_miptree.c
@@ -28,6 +28,7 @@
 #include "util/u_surface.h"
 
 #include "nv_m2mf.xml.h"
+#include "nv_object.xml.h"
 #include "nv30/nv30_screen.h"
 #include "nv30/nv30_context.h"
 #include "nv30/nv30_resource.h"
@@ -362,6 +363,7 @@ nv30_miptree_create(struct pipe_screen *pscreen,
    blocksz = util_format_get_blocksize(pt->format);
 
    if ((pt->target == PIPE_TEXTURE_RECT) ||
+       (pt->bind & PIPE_BIND_SCANOUT) ||
        !util_is_power_of_two(pt->width0) ||
        !util_is_power_of_two(pt->height0) ||
        !util_is_power_of_two(pt->depth0) ||
@@ -369,6 +371,14 @@ nv30_miptree_create(struct pipe_screen *pscreen,
        util_format_is_float(pt->format) || mt->ms_mode) {
       mt->uniform_pitch = util_format_get_nblocksx(pt->format, w) * blocksz;
       mt->uniform_pitch = align(mt->uniform_pitch, 64);
+      if (pt->bind & PIPE_BIND_SCANOUT) {
+         struct nv30_screen *screen = nv30_screen(pscreen);
+         int pitch_align = MAX2(
+               screen->eng3d->oclass >= NV40_3D_CLASS ? 1024 : 256,
+               /* round_down_pow2(mt->uniform_pitch / 4) */
+               1 << (util_last_bit(mt->uniform_pitch / 4) - 1));
+         mt->uniform_pitch = align(mt->uniform_pitch, pitch_align);
+      }
    }
 
    if (!mt->uniform_pitch)
-- 
2.4.3