From 94b4a4b2a53da4baaed49ccb322fbabdfcc20f44 Mon Sep 17 00:00:00 2001
From: Nanley Chery <nanley.g.chery@intel.com>
Date: Tue, 13 Dec 2022 16:30:01 -0800
Subject: [PATCH] iris: Check for zero in clear color compatibility fn

Both formats may interpret the clear color as zero.

Reviewed-by: Kenneth Graunke <kenneth@whitecape.org>
Part-of: <https://gitlab.freedesktop.org/mesa/mesa/-/merge_requests/20320>
---
 src/gallium/drivers/iris/iris_resolve.c | 7 +++++++
 1 file changed, 7 insertions(+)

diff --git a/src/gallium/drivers/iris/iris_resolve.c b/src/gallium/drivers/iris/iris_resolve.c
index 2e17e481c15..f00731aa29e 100644
--- a/src/gallium/drivers/iris/iris_resolve.c
+++ b/src/gallium/drivers/iris/iris_resolve.c
@@ -1129,6 +1129,13 @@ iris_render_formats_color_compatible(enum isl_format a, enum isl_format b,
       return true;
    }
 
+   /* Both formats may interpret the clear color as zero. */
+   if (!clear_color_unknown &&
+       isl_color_value_is_zero(color, a) &&
+       isl_color_value_is_zero(color, b)) {
+      return true;
+   }
+
    return false;
 }