From 350144cde66556bce00ad2608797035076914efe Mon Sep 17 00:00:00 2001
From: Vlad Zahorodnii <vlad.zahorodnii@kde.org>
Date: Wed, 3 Nov 2021 19:00:50 +0200
Subject: [PATCH] scenes/opengl: Remove viewport check

It's unreliable and it sometimes produces false positives (due to buggy
drivers).
---
 src/plugins/scenes/opengl/scene_opengl.cpp | 21 ---------------------
 src/plugins/scenes/opengl/scene_opengl.h   |  1 -
 2 files changed, 22 deletions(-)

diff --git a/src/plugins/scenes/opengl/scene_opengl.cpp b/src/plugins/scenes/opengl/scene_opengl.cpp
index 329030c66f..2ba11e08ad 100644
--- a/src/plugins/scenes/opengl/scene_opengl.cpp
+++ b/src/plugins/scenes/opengl/scene_opengl.cpp
@@ -75,9 +75,6 @@ SceneOpenGL::SceneOpenGL(OpenGLBackend *backend, QObject *parent)
     : Scene(parent)
     , m_backend(backend)
 {
-    if (!viewportLimitsMatched(screens()->size()))
-        return;
-
     // perform Scene specific checks
     GLPlatform *glPlatform = GLPlatform::instance();
     if (!glPlatform->isGLES() && !hasGLExtension(QByteArrayLiteral("GL_ARB_texture_non_power_of_two"))
@@ -568,24 +565,6 @@ void SceneOpenGL::extendPaintRegion(QRegion &region, bool opaqueFullscreen)
     }
 }
 
-bool SceneOpenGL::viewportLimitsMatched(const QSize &size) const {
-    if (kwinApp()->operationMode() != Application::OperationModeX11) {
-        // TODO: On Wayland we can't suspend. Find a solution that works here as well!
-        return true;
-    }
-    GLint limit[2];
-    glGetIntegerv(GL_MAX_VIEWPORT_DIMS, limit);
-    if (limit[0] < size.width() || limit[1] < size.height()) {
-        auto compositor = static_cast<X11Compositor*>(Compositor::self());
-        QMetaObject::invokeMethod(compositor, [compositor]() {
-            qCDebug(KWIN_OPENGL) << "Suspending compositing because viewport limits are not met";
-            compositor->suspend(X11Compositor::AllReasonSuspend);
-        }, Qt::QueuedConnection);
-        return false;
-    }
-    return true;
-}
-
 void SceneOpenGL::paintDesktop(int desktop, int mask, const QRegion &region, ScreenPaintData &data)
 {
     const QRect r = region.boundingRect();
diff --git a/src/plugins/scenes/opengl/scene_opengl.h b/src/plugins/scenes/opengl/scene_opengl.h
index 64c846d375..d84d544b0a 100644
--- a/src/plugins/scenes/opengl/scene_opengl.h
+++ b/src/plugins/scenes/opengl/scene_opengl.h
@@ -79,7 +79,6 @@ protected:
     void paintCursor(const QRegion &region) override;
 
 private:
-    bool viewportLimitsMatched(const QSize &size) const;
     void doPaintBackground(const QVector< float >& vertices);
     void updateProjectionMatrix(const QRect &geometry);
     void performPaintWindow(EffectWindowImpl* w, int mask, const QRegion &region, WindowPaintData& data);