Mesa (master): st/mesa: skip draw calls with pipe_draw_info::count == 0

[Marek Olšák]

Module: Mesa
Branch: master
Commit: e4018fdd85d8b58250c2cff8cdf4edd6b2b3c70b
URL:    http://cgit.freedesktop.org/mesa/mesa/commit/?id=e4018fdd85d8b58250c2cff8cdf4edd6b2b3c70b

Author: Marek Olšák <marek.olsak at amd.com>
Date:   Fri Sep  1 23:27:35 2017 +0200

st/mesa: skip draw calls with pipe_draw_info::count == 0

Bugzilla: https://bugs.freedesktop.org/show_bug.cgi?id=102502

Cc: 17.2 <mesa-stable at lists.freedesktop.org>
Tested-by: Alexandre Demers <alexandre.f.demers at gmail.com>
Tested-by: Dieter Nützel <Dieter at nuetzel-hh.de>
Acked-by: Timothy Arceri <tarceri at itsqueeze.com>

---

 src/mesa/state_tracker/st_draw.c | 7 ++++++-
 1 file changed, 6 insertions(+), 1 deletion(-)

diff --git a/src/mesa/state_tracker/st_draw.c b/src/mesa/state_tracker/st_draw.c
index fe03a4a587..2fe7070bca 100644
--- a/src/mesa/state_tracker/st_draw.c
+++ b/src/mesa/state_tracker/st_draw.c
@@ -198,9 +198,14 @@ st_draw_vbo(struct gl_context *ctx,
 
    /* do actual drawing */
    for (i = 0; i < nr_prims; i++) {
+      info.count = prims[i].count;
+
+      /* Skip no-op draw calls. */
+      if (!info.count && !tfb_vertcount)
+         continue;
+
       info.mode = translate_prim(ctx, prims[i].mode);
       info.start = start + prims[i].start;
-      info.count = prims[i].count;
       info.start_instance = prims[i].base_instance;
       info.instance_count = prims[i].num_instances;
       info.index_bias = prims[i].basevertex;