[Mesa-dev] [PATCH] nvc0: do not break 3D state by pushing MS coordinates on Fermi

[Samuel Pitoiset]

Long short story, 3D and CP are aliased on Fermi and initializing
compute after pushing the MS sample coordinate offsets seems to
corrupt 3D state for weird reasons.

I still don't have the faintest clue what is going on, but
this seems to only affect Fermi generation. A possible fix
could be to use two different channels, one for 3D and one
for CP.

This fixes a bunch of regressions pinpointed by piglit.

Fixes: "nvc0: fix up image support for allowing multiple samples"
Cc: "12.0" <mesa-stable at lists.freedesktop.org>
Signed-off-by: Samuel Pitoiset <samuel.pitoiset at gmail.com>
---

This will require different piglit runs on both Fermi and Kepler+
to be sure I don't break anything else, but I'm quite confident.

 src/gallium/drivers/nouveau/nvc0/nvc0_screen.c | 87 +++++++++++++-------------
 1 file changed, 44 insertions(+), 43 deletions(-)

diff --git a/src/gallium/drivers/nouveau/nvc0/nvc0_screen.c b/src/gallium/drivers/nouveau/nvc0/nvc0_screen.c
index cfa2f76..2cac3c7 100644
--- a/src/gallium/drivers/nouveau/nvc0/nvc0_screen.c
+++ b/src/gallium/drivers/nouveau/nvc0/nvc0_screen.c
@@ -1002,49 +1002,6 @@ nvc0_screen_create(struct nouveau_device *dev)
 
    PUSH_REFN (push, screen->uniform_bo, NV_VRAM_DOMAIN(&screen->base) | NOUVEAU_BO_WR);
 
-   for (i = 0; i < 5; ++i) {
-      /* TIC and TSC entries for each unit (nve4+ only) */
-      /* auxiliary constants (6 user clip planes, base instance id) */
-      BEGIN_NVC0(push, NVC0_3D(CB_SIZE), 3);
-      PUSH_DATA (push, NVC0_CB_AUX_SIZE);
-      PUSH_DATAh(push, screen->uniform_bo->offset + NVC0_CB_AUX_INFO(i));
-      PUSH_DATA (push, screen->uniform_bo->offset + NVC0_CB_AUX_INFO(i));
-      BEGIN_NVC0(push, NVC0_3D(CB_BIND(i)), 1);
-      PUSH_DATA (push, (15 << 4) | 1);
-      if (screen->eng3d->oclass >= NVE4_3D_CLASS) {
-         unsigned j;
-         BEGIN_1IC0(push, NVC0_3D(CB_POS), 9);
-         PUSH_DATA (push, NVC0_CB_AUX_UNK_INFO);
-         for (j = 0; j < 8; ++j)
-            PUSH_DATA(push, j);
-      } else {
-         BEGIN_NVC0(push, NVC0_3D(TEX_LIMITS(i)), 1);
-         PUSH_DATA (push, 0x54);
-      }
-
-      /* MS sample coordinate offsets: these do not work with _ALT modes ! */
-      BEGIN_1IC0(push, NVC0_3D(CB_POS), 1 + 2 * 8);
-      PUSH_DATA (push, NVC0_CB_AUX_MS_INFO);
-      PUSH_DATA (push, 0); /* 0 */
-      PUSH_DATA (push, 0);
-      PUSH_DATA (push, 1); /* 1 */
-      PUSH_DATA (push, 0);
-      PUSH_DATA (push, 0); /* 2 */
-      PUSH_DATA (push, 1);
-      PUSH_DATA (push, 1); /* 3 */
-      PUSH_DATA (push, 1);
-      PUSH_DATA (push, 2); /* 4 */
-      PUSH_DATA (push, 0);
-      PUSH_DATA (push, 3); /* 5 */
-      PUSH_DATA (push, 0);
-      PUSH_DATA (push, 2); /* 6 */
-      PUSH_DATA (push, 1);
-      PUSH_DATA (push, 3); /* 7 */
-      PUSH_DATA (push, 1);
-   }
-   BEGIN_NVC0(push, NVC0_3D(LINKED_TSC), 1);
-   PUSH_DATA (push, 0);
-
    /* return { 0.0, 0.0, 0.0, 0.0 } for out-of-bounds vtxbuf access */
    BEGIN_NVC0(push, NVC0_3D(CB_SIZE), 3);
    PUSH_DATA (push, 256);
@@ -1214,6 +1171,50 @@ nvc0_screen_create(struct nouveau_device *dev)
    if (nvc0_screen_init_compute(screen))
       goto fail;
 
+   /* XXX: Compute and 3D are somehow aliased on Fermi. */
+   for (i = 0; i < 5; ++i) {
+      /* TIC and TSC entries for each unit (nve4+ only) */
+      /* auxiliary constants (6 user clip planes, base instance id) */
+      BEGIN_NVC0(push, NVC0_3D(CB_SIZE), 3);
+      PUSH_DATA (push, NVC0_CB_AUX_SIZE);
+      PUSH_DATAh(push, screen->uniform_bo->offset + NVC0_CB_AUX_INFO(i));
+      PUSH_DATA (push, screen->uniform_bo->offset + NVC0_CB_AUX_INFO(i));
+      BEGIN_NVC0(push, NVC0_3D(CB_BIND(i)), 1);
+      PUSH_DATA (push, (15 << 4) | 1);
+      if (screen->eng3d->oclass >= NVE4_3D_CLASS) {
+         unsigned j;
+         BEGIN_1IC0(push, NVC0_3D(CB_POS), 9);
+         PUSH_DATA (push, NVC0_CB_AUX_UNK_INFO);
+         for (j = 0; j < 8; ++j)
+            PUSH_DATA(push, j);
+      } else {
+         BEGIN_NVC0(push, NVC0_3D(TEX_LIMITS(i)), 1);
+         PUSH_DATA (push, 0x54);
+      }
+
+      /* MS sample coordinate offsets: these do not work with _ALT modes ! */
+      BEGIN_1IC0(push, NVC0_3D(CB_POS), 1 + 2 * 8);
+      PUSH_DATA (push, NVC0_CB_AUX_MS_INFO);
+      PUSH_DATA (push, 0); /* 0 */
+      PUSH_DATA (push, 0);
+      PUSH_DATA (push, 1); /* 1 */
+      PUSH_DATA (push, 0);
+      PUSH_DATA (push, 0); /* 2 */
+      PUSH_DATA (push, 1);
+      PUSH_DATA (push, 1); /* 3 */
+      PUSH_DATA (push, 1);
+      PUSH_DATA (push, 2); /* 4 */
+      PUSH_DATA (push, 0);
+      PUSH_DATA (push, 3); /* 5 */
+      PUSH_DATA (push, 0);
+      PUSH_DATA (push, 2); /* 6 */
+      PUSH_DATA (push, 1);
+      PUSH_DATA (push, 3); /* 7 */
+      PUSH_DATA (push, 1);
+   }
+   BEGIN_NVC0(push, NVC0_3D(LINKED_TSC), 1);
+   PUSH_DATA (push, 0);
+
    PUSH_KICK (push);
 
    screen->tic.entries = CALLOC(4096, sizeof(void *));
-- 
2.10.0