vc4: Just stream out fallback IB contents.

The idea I had when I wrote the original shadow code was that you'd see a
set_index_buffer to the IB, then a bunch of draws out of it.  What's
actually happening in openarena is that set_index_buffer occurs at every
draw, so we end up making a new shadow BO every time, and converting more
of the BO than is actually used in the draw.

While I could maybe come up with a better caching scheme, for now just
do the simple thing that doesn't result in a new shadow IB allocation
per draw.

Improves performance of isosurf in drawelements mode by 58.7967% +/-
3.86152% (n=8).

1 files changed, 7 insertions, 0 deletions

diff --git a/src/gallium/drivers/vc4/vc4_context.c b/src/gallium/drivers/vc4/vc4_context.c
index b394c186efb..a2b1cac952d 100644
--- a/src/gallium/drivers/vc4/vc4_context.c
+++ b/src/gallium/drivers/vc4/vc4_context.c
@@ -29,6 +29,7 @@
 #include "util/u_inlines.h"
 #include "util/u_memory.h"
 #include "util/u_blitter.h"
+#include "util/u_upload_mgr.h"
 #include "indices/u_primconvert.h"
 #include "pipe/p_screen.h"
 
@@ -410,6 +411,9 @@ vc4_context_destroy(struct pipe_context *pctx)
         if (vc4->primconvert)
                 util_primconvert_destroy(vc4->primconvert);
 
+        if (vc4->uploader)
+                u_upload_destroy(vc4->uploader);
+
         util_slab_destroy(&vc4->transfer_pool);
 
         pipe_surface_reference(&vc4->framebuffer.cbufs[0], NULL);
@@ -466,6 +470,9 @@ vc4_context_create(struct pipe_screen *pscreen, void *priv)
         if (!vc4->primconvert)
                 goto fail;
 
+        vc4->uploader = u_upload_create(pctx, 16 * 1024, 4,
+                                        PIPE_BIND_INDEX_BUFFER);
+
         vc4_debug |= saved_shaderdb_flag;
 
         return &vc4->base;