user/mesa: Fix behaviour on big endian systems

1 files changed, 37 insertions, 0 deletions

diff --git a/user/mesa/big-endian-flipping.patch b/user/mesa/big-endian-flipping.patch
new file mode 100644
index 000000000..154a83108
--- /dev/null
+++ b/user/mesa/big-endian-flipping.patch
@@ -0,0 +1,37 @@
+From f1e0d76264491a8d8f99a0041b1a36cf9752fd28 Mon Sep 17 00:00:00 2001
+From: "A. Wilcox" <AWilcox@Wilcox-Tech.com>
+Date: Thu, 27 Feb 2020 04:24:52 -0600
+Subject: [PATCH] mesa: Support flipping three-channel formats
+
+Test system: POWER9 ppc64 (BE) system with a Radeon R5 230.
+
+Before this commit, starting Xorg caused this message:
+Assertion failed: !"Invalid array format" (../src/mesa/main/formats.c: _mesa_array_format_flip_channels: 421)
+
+After this commit, Xorg starts successfully.
+---
+ src/mesa/main/formats.c | 8 ++++++++
+ 1 file changed, 8 insertions(+)
+
+diff --git a/src/mesa/main/formats.c b/src/mesa/main/formats.c
+index 370859d37ca..2e7d5d7f05e 100644
+--- a/src/mesa/main/formats.c
++++ b/src/mesa/main/formats.c
+@@ -419,6 +419,14 @@ _mesa_array_format_flip_channels(mesa_array_format format)
+       return format;
+    }
+ 
++   if (num_channels == 3) {
++      static const uint8_t flip[6] = { 2, 1, 0, 3, 4, 5 };
++      _mesa_array_format_set_swizzle(&format,
++                                     flip[swizzle[0]], flip[swizzle[1]],
++                                     flip[swizzle[2]], flip[swizzle[3]]);
++      return format;
++   }
++
+    if (num_channels == 4) {
+       static const uint8_t flip[6] = { 3, 2, 1, 0, 4, 5 };
+       _mesa_array_format_set_swizzle(&format,
+-- 
+2.25.1
+