From e57be93108fcb1f29b2b374613c2d08a174ef32c Mon Sep 17 00:00:00 2001
From: Vlad Zahorodnii <vlad.zahorodnii@kde.org>
Date: Wed, 25 May 2022 12:00:48 +0300
Subject: [PATCH] backends/drm: Specify clear color for cursor plane

Otherwise the results are undefined.

BUG: 454068
Tested-by: Merge Service <https://invent.kde.org/plasma/kwin/-/merge_requests/2466>
Part-of: <https://invent.kde.org/plasma/kwin/-/merge_requests/2466>
---
 src/backends/drm/drm_output.cpp | 2 ++
 1 file changed, 2 insertions(+)

diff --git a/src/backends/drm/drm_output.cpp b/src/backends/drm/drm_output.cpp
index a5956314d3..86bd1039c2 100644
--- a/src/backends/drm/drm_output.cpp
+++ b/src/backends/drm/drm_output.cpp
@@ -449,7 +449,9 @@ void DrmOutput::renderCursorOpengl(const QSize &cursorSize)
     QMatrix4x4 mvp;
     mvp.ortho(QRect(QPoint(), renderTarget.size()));
 
+    glClearColor(0, 0, 0, 0);
     glClear(GL_COLOR_BUFFER_BIT);
+
     glEnable(GL_BLEND);
     glBlendFunc(GL_SRC_ALPHA, GL_ONE_MINUS_SRC_ALPHA);