nvc0: disable primitive restart and index bias during blits

Back in the dawn of time, we used to do immediate uploads for the vertex
data, and all was well. However Maxwell dropped support for immediate
vertex data, so we started feeding in a VBO (in all cases). But we
forgot to disable some things that apply in such cases, specifically
primitive restart and index bias. The latter was causing WoW and other
Blizzard games trouble as they use a pattern where they draw with a base
vertex (aka index bias), followed by texture uploads (aka blits,
internally).

Bugzilla: https://bugs.freedesktop.org/show_bug.cgi?id=91526
Cc: "11.1 11.2" <[email protected]>
Signed-off-by: Ilia Mirkin <[email protected]>
Tested-by: Karol Herbst <[email protected]>

1 files changed, 11 insertions, 0 deletions

diff --git a/src/gallium/drivers/nouveau/nvc0/nvc0_surface.c b/src/gallium/drivers/nouveau/nvc0/nvc0_surface.c
index e8b3a4d549a..3ebacb6b234 100644
--- a/src/gallium/drivers/nouveau/nvc0/nvc0_surface.c
+++ b/src/gallium/drivers/nouveau/nvc0/nvc0_surface.c
@@ -1303,6 +1303,17 @@ nvc0_blit_3d(struct nvc0_context *nvc0, const struct pipe_blit_info *info)
    }
    nvc0->state.num_vtxelts = 2;
 
+   if (nvc0->state.prim_restart) {
+      IMMED_NVC0(push, NVC0_3D(PRIM_RESTART_ENABLE), 0);
+      nvc0->state.prim_restart = 0;
+   }
+
+   if (nvc0->state.index_bias) {
+      IMMED_NVC0(push, NVC0_3D(VB_ELEMENT_BASE), 0);
+      IMMED_NVC0(push, NVC0_3D(VERTEX_ID_BASE), 0);
+      nvc0->state.index_bias = 0;
+   }
+
    for (i = 0; i < info->dst.box.depth; ++i, z += dz) {
       if (info->dst.box.z + i) {
          BEGIN_NVC0(push, NVC0_3D(LAYER), 1);