From 253f954e3101d8d53398b7ec8d83d7b25e9a3bae Mon Sep 17 00:00:00 2001
From: Vlad Zagorodniy <vladzzag@gmail.com>
Date: Fri, 18 Jan 2019 20:39:49 +0200
Subject: [PATCH] [scenes/opengl] Destroy the lanczos filter when the backend
 is still alive

Summary:
Currently, when the lanczos filter attempts to release acquired resources,
the backend is already gone. To fix that we have to destroy the filter
together with SceneOpenGL2. At that moment the backend is still alive.

BUG: 403370
FIXED-IN: 5.15.0

Reviewers: #kwin, davidedmundson

Reviewed By: #kwin, davidedmundson

Subscribers: kwin

Tags: #kwin

Differential Revision: https://phabricator.kde.org/D18367
---
 plugins/scenes/opengl/scene_opengl.cpp | 5 +++++
 1 file changed, 5 insertions(+)

diff --git a/plugins/scenes/opengl/scene_opengl.cpp b/plugins/scenes/opengl/scene_opengl.cpp
index 49574e79b4..9c43be7c69 100644
--- a/plugins/scenes/opengl/scene_opengl.cpp
+++ b/plugins/scenes/opengl/scene_opengl.cpp
@@ -953,6 +953,11 @@ SceneOpenGL2::SceneOpenGL2(OpenGLBackend *backend, QObject *parent)
 
 SceneOpenGL2::~SceneOpenGL2()
 {
+    if (m_lanczosFilter) {
+        makeOpenGLContextCurrent();
+        delete m_lanczosFilter;
+        m_lanczosFilter = nullptr;
+    }
 }
 
 QMatrix4x4 SceneOpenGL2::createProjectionMatrix() const