nvfx: add NOUVEAU_VTXIDX_IN_VRAM variable to put vertex/index buffers in VRAM

On some systems, putting vertex and index buffers in VRAM instead of GART
memory eliminates massive graphics corruption which is otherwise present,
due to unclear causes.

This patch adds an environment variable that does that, along with helpful
messages.

It turns it on by default on G7x, as it is what I am seeing corruption
on and some other reports also seemed to pinpoint these cards.

1 files changed, 1 insertions, 0 deletions

diff --git a/src/gallium/drivers/nvfx/nvfx_screen.h b/src/gallium/drivers/nvfx/nvfx_screen.h
index c0b4b9899d..baa848c47a 100644
--- a/src/gallium/drivers/nvfx/nvfx_screen.h
+++ b/src/gallium/drivers/nvfx/nvfx_screen.h
@@ -12,6 +12,7 @@ struct nvfx_screen {
 	struct nvfx_context *cur_ctx;
 
 	unsigned is_nv4x; /* either 0 or ~0 */
+	int vertex_buffer_flags;
 
 	/* HW graphics objects */
 	struct nv04_surface_2d *eng2d;