Mesa (master): panfrost: Identify glProvokingVertex flag

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Module: Mesa
Branch: master
Commit: 71df7c69bc44a2daddf07efa03bf0526aea533ee
URL:    http://cgit.freedesktop.org/mesa/mesa/commit/?id=71df7c69bc44a2daddf07efa03bf0526aea533ee

Author: Alyssa Rosenzweig <alyssa.rosenzweig at collabora.com>
Date:   Fri Dec 27 15:33:21 2019 -0500

panfrost: Identify glProvokingVertex flag

Signed-off-by: Alyssa Rosenzweig <alyssa.rosenzweig at collabora.com>

---

 src/gallium/drivers/panfrost/pan_context.c | 5 ++---
 src/panfrost/include/panfrost-job.h        | 6 ++++++
 2 files changed, 8 insertions(+), 3 deletions(-)

diff --git a/src/gallium/drivers/panfrost/pan_context.c b/src/gallium/drivers/panfrost/pan_context.c
index 1446354ade0..14c6fcbd155 100644
--- a/src/gallium/drivers/panfrost/pan_context.c
+++ b/src/gallium/drivers/panfrost/pan_context.c
@@ -1476,9 +1476,8 @@ panfrost_draw_vbo(
 
         draw_flags |= 0x3000;
 
-        if (mode == PIPE_PRIM_LINE_STRIP) {
-                draw_flags |= 0x800;
-        }
+        if (ctx->rasterizer && ctx->rasterizer->base.flatshade_first)
+                draw_flags |= MALI_DRAW_FLATSHADE_FIRST;
 
         panfrost_statistics_record(ctx, info);
 
diff --git a/src/panfrost/include/panfrost-job.h b/src/panfrost/include/panfrost-job.h
index fa43f8c32a4..85dd2b40e1d 100644
--- a/src/panfrost/include/panfrost-job.h
+++ b/src/panfrost/include/panfrost-job.h
@@ -884,6 +884,12 @@ struct mali_uniform_buffer_meta {
 #define MALI_DRAW_INDEXED_SHIFT  (4)
 
 #define MALI_DRAW_VARYING_SIZE   (0x100)
+
+/* Set to use first vertex as the provoking vertex for flatshading. Clear to
+ * use the last vertex. This is the default in DX and VK, but not in GL. */
+
+#define MALI_DRAW_FLATSHADE_FIRST (0x800)
+
 #define MALI_DRAW_PRIMITIVE_RESTART_FIXED_INDEX (0x10000)
 
 struct mali_vertex_tiler_prefix {