From 545ea04d281abae5d7cfecbc28223d878897a9c0 Mon Sep 17 00:00:00 2001
From: Christopher James Halse Rogers <chris@cooperteam.net>
Date: Tue, 16 Jan 2024 21:55:12 +0000
Subject: [PATCH] Merge pull request #3188 from MirServer/laterality

Fix transformation for Layout::TopRowFirst
---
 src/renderers/gl/renderer.cpp | 4 ++--
 1 file changed, 2 insertions(+), 2 deletions(-)

diff --git a/src/renderers/gl/renderer.cpp b/src/renderers/gl/renderer.cpp
index eed3bae9528..9448dd5ccf3 100644
--- a/src/renderers/gl/renderer.cpp
+++ b/src/renderers/gl/renderer.cpp
@@ -622,12 +622,12 @@ void mrg::Renderer::set_output_transform(glm::mat2 const& t)
     case graphics::gl::OutputSurface::Layout::TopRowFirst:
         // GL is going to render in its own coordinate system, but the OutputSurface
         // wants the output to be the other way up. Get GL to render upside-down instead.
-        new_display_transform *= glm::mat4{
+        new_display_transform = glm::mat4{
             1.0, 0.0, 0.0, 0.0,
             0.0, -1.0, 0.0, 0.0,
             0.0, 0.0, 1.0, 0.0,
             0.0, 0.0, 0.0, 1.0
-        };
+        } * new_display_transform;
         break;
     }