mesa: add format-helper for bptc

Acked-by: Marek Olšák <marek.olsak@amd.com>
Acked-by: Soroush Kashani <soroush.kashani@imgtec.com>
Part-of: <https://gitlab.freedesktop.org/mesa/mesa/-/merge_requests/18012>

src/mesa/main/formats.c

@@ -645,6 +645,16 @@ _mesa_is_format_astc_2d(mesa_format format)
 }
 
 
+/**
+ * Return TRUE if format is an BPTC compressed format.
+ */
+bool
+_mesa_is_format_bptc(mesa_format format)
+{
+   return _mesa_get_format_layout(format) == MESA_FORMAT_LAYOUT_BPTC;
+}
+
+
 /**
  * If the given format is a compressed format, return a corresponding
  * uncompressed format.

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_bptc(mesa_format format);
+
 bool
 _mesa_is_format_color_format(mesa_format format);