Mesa (master): gallium/u_threaded: skip draws if user index buffer size has size == 0

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Module: Mesa
Branch: master
Commit: be50c7f329707a4501fd8e4fc1d7ddeeead0353e
URL:    http://cgit.freedesktop.org/mesa/mesa/commit/?id=be50c7f329707a4501fd8e4fc1d7ddeeead0353e

Author: Marek Olšák <marek.olsak at amd.com>
Date:   Tue Jan  5 23:14:55 2021 -0500

gallium/u_threaded: skip draws if user index buffer size has size == 0

This happens when all draws have count == 0.

Fixes: 85b6ba136bdc2db5 "st/mesa: implement Driver.DrawGallium callbacks

Acked-by: Pierre-Eric Pelloux-Prayer <pierre-eric.pelloux-prayer at amd.com>
Part-of: <https://gitlab.freedesktop.org/mesa/mesa/-/merge_requests/8345>

---

 src/gallium/auxiliary/util/u_threaded_context.c | 6 ++++++
 1 file changed, 6 insertions(+)

diff --git a/src/gallium/auxiliary/util/u_threaded_context.c b/src/gallium/auxiliary/util/u_threaded_context.c
index bdd1ac99fb0..7d5150528bc 100644
--- a/src/gallium/auxiliary/util/u_threaded_context.c
+++ b/src/gallium/auxiliary/util/u_threaded_context.c
@@ -2401,6 +2401,9 @@ tc_draw_vbo(struct pipe_context *_pipe, const struct pipe_draw_info *info,
          struct pipe_resource *buffer = NULL;
          unsigned offset;
 
+         if (!size)
+            return;
+
          /* This must be done before adding draw_vbo, because it could generate
           * e.g. transfer_unmap and flush partially-uninitialized draw_vbo
           * to the driver if it was done afterwards.
@@ -2445,6 +2448,9 @@ tc_draw_vbo(struct pipe_context *_pipe, const struct pipe_draw_info *info,
       for (unsigned i = 0; i < num_draws; i++)
          total_count += draws[i].count;
 
+      if (!total_count)
+         return;
+
       /* Allocate space for all index buffers.
        *
        * This must be done before adding draw_vbo, because it could generate