From e05930511b7d3dafa36cc8d2dca51767edeff3b9 Mon Sep 17 00:00:00 2001
From: Alyssa Rosenzweig <alyssa.rosenzweig@collabora.com>
Date: Tue, 18 Aug 2020 17:28:38 -0400
Subject: [PATCH] gallium: Add util_blend_factor_uses_dest helper
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Drivers may be able to optimize cases where blending is enabled but the
destination colour is not used. This helps detect that case.

Signed-off-by: Alyssa Rosenzweig <alyssa.rosenzweig@collabora.com>
Reviewed-by: Eric Anholt <eric@anholt.net>
Reviewed-by: Marek Olšák <marek.olsak@amd.com>
Part-of: <https://gitlab.freedesktop.org/mesa/mesa/-/merge_requests/6407>
---
 src/gallium/auxiliary/util/u_blend.h | 18 ++++++++++++++++++
 1 file changed, 18 insertions(+)

diff --git a/src/gallium/auxiliary/util/u_blend.h b/src/gallium/auxiliary/util/u_blend.h
index d5f9050bc32..7fca2fab6d1 100644
--- a/src/gallium/auxiliary/util/u_blend.h
+++ b/src/gallium/auxiliary/util/u_blend.h
@@ -114,4 +114,22 @@ util_blend_factor_is_inverted(enum pipe_blendfactor factor)
    }
 }
 
+/* To determine if the destination needs to be read while blending */
+
+static inline bool
+util_blend_factor_uses_dest(enum pipe_blendfactor factor, bool alpha)
+{
+   switch (factor) {
+      case PIPE_BLENDFACTOR_DST_ALPHA:
+      case PIPE_BLENDFACTOR_DST_COLOR:
+      case PIPE_BLENDFACTOR_INV_DST_ALPHA:
+      case PIPE_BLENDFACTOR_INV_DST_COLOR:
+         return true;
+      case PIPE_BLENDFACTOR_SRC_ALPHA_SATURATE:
+         return !alpha;
+      default:
+         return false;
+   }
+}
+
 #endif /* U_BLEND_H */
-- 
2.30.2