From 5087ba3666508e7d4bfdd1bd55dda126fd528560 Mon Sep 17 00:00:00 2001
From: Erik Faye-Lund <erik.faye-lund@collabora.com>
Date: Wed, 10 Aug 2022 08:27:19 +0200
Subject: [PATCH] mesa: add format-helpers for s3tc
MIME-Version: 1.0
Content-Type: text/plain; charset=UTF-8
Content-Transfer-Encoding: 8bit

Reviewed-by: Marek Olšák <marek.olsak@amd.com>
Reviewed-by: Alyssa Rosenzweig <alyssa.rosenzweig@collabora.com>
Acked-by: Eric Engestrom <eric@igalia.com>
Part-of: <https://gitlab.freedesktop.org/mesa/mesa/-/merge_requests/18180>
---
 src/mesa/main/formats.c | 10 ++++++++++
 src/mesa/main/formats.h |  3 +++
 2 files changed, 13 insertions(+)

diff --git a/src/mesa/main/formats.c b/src/mesa/main/formats.c
index 6f0ccd01220..19489e84648 100644
--- a/src/mesa/main/formats.c
+++ b/src/mesa/main/formats.c
@@ -645,6 +645,16 @@ _mesa_is_format_astc_2d(mesa_format format)
 }
 
 
+/**
+ * Return TRUE if format is an S3TC compressed format.
+ */
+bool
+_mesa_is_format_s3tc(mesa_format format)
+{
+   return _mesa_get_format_layout(format) == MESA_FORMAT_LAYOUT_S3TC;
+}
+
+
 /**
  * Return TRUE if format is an BPTC compressed format.
  */
diff --git a/src/mesa/main/formats.h b/src/mesa/main/formats.h
index 03baa204380..e8f91389b93 100644
--- a/src/mesa/main/formats.h
+++ b/src/mesa/main/formats.h
@@ -695,6 +695,9 @@ _mesa_is_format_etc2(mesa_format format);
 bool
 _mesa_is_format_astc_2d(mesa_format format);
 
+bool
+_mesa_is_format_s3tc(mesa_format format);
+
 bool
 _mesa_is_format_bptc(mesa_format format);