nvfx: support clip planes sensibly and fix them on nv30

Before, we were discarding the compiled vertex program on each
vertex program change.

Now we compile the program as if there were 6 clip planes and
dynamically patch in an "end program" bit at the right place.

Also, nv30 should now work.

1 files changed, 4 insertions, 0 deletions

diff --git a/src/gallium/drivers/nvfx/nvfx_context.c b/src/gallium/drivers/nvfx/nvfx_context.c
index 80b36fb7b9..2f775f92cf 100644
--- a/src/gallium/drivers/nvfx/nvfx_context.c
+++ b/src/gallium/drivers/nvfx/nvfx_context.c
@@ -75,6 +75,10 @@ nvfx_create(struct pipe_screen *pscreen, void *priv)
 	screen->base.channel->user_private = nvfx;
 
 	nvfx->is_nv4x = screen->is_nv4x;
+	/* TODO: it seems that nv30 might have fixed function clipping usable with vertex programs
+	 * However, my code for that doesn't work, so use vp clipping for all cards, which works.
+	 */
+	nvfx->use_vp_clipping = TRUE;
 
 	nvfx_init_query_functions(nvfx);
 	nvfx_init_surface_functions(nvfx);