diff --git a/libkwineffects/kwinglutils.h b/libkwineffects/kwinglutils.h
--- a/libkwineffects/kwinglutils.h
+++ b/libkwineffects/kwinglutils.h
@@ -775,9 +775,21 @@
         s_virtualScreenGeometry = g;
     }
 
+    /**
+     * The scale of the OpenGL window currently being rendered to
+     *
+     * @returns the ratio between the virtual geometry space the rendering
+     * system uses and the target
+     * @since 5.11.3
+     */
+    static void setVirtualScreenScale(qreal s) {
+        s_virtualScreenScale = s;
+    }
+
 private:
     GLVertexBufferPrivate* const d;
     static QRect s_virtualScreenGeometry;
+    static qreal s_virtualScreenScale;
 };
 
 } // namespace
diff --git a/libkwineffects/kwinglutils.cpp b/libkwineffects/kwinglutils.cpp
--- a/libkwineffects/kwinglutils.cpp
+++ b/libkwineffects/kwinglutils.cpp
@@ -1950,6 +1950,7 @@
 // GLVertexBuffer
 //*********************************
 QRect GLVertexBuffer::s_virtualScreenGeometry;
+qreal GLVertexBuffer::s_virtualScreenScale;
 
 GLVertexBuffer::GLVertexBuffer(UsageHint hint)
     : d(new GLVertexBufferPrivate(hint))
@@ -2123,7 +2124,10 @@
         } else {
             // Clip using scissoring
             foreach (const QRect &r, region.rects()) {
-                glScissor(r.x() - s_virtualScreenGeometry.x(), s_virtualScreenGeometry.height() + s_virtualScreenGeometry.y() - r.y() - r.height(), r.width(), r.height());
+                glScissor((r.x() - s_virtualScreenGeometry.x()) * s_virtualScreenScale,
+                (s_virtualScreenGeometry.height() + s_virtualScreenGeometry.y() - r.y() - r.height()) * s_virtualScreenScale,
+                r.width() * s_virtualScreenScale,
+                r.height() * s_virtualScreenScale);
                 glDrawElementsBaseVertex(GL_TRIANGLES, count, GL_UNSIGNED_SHORT, nullptr, first);
             }
         }
@@ -2135,7 +2139,10 @@
     } else {
         // Clip using scissoring
         foreach (const QRect &r, region.rects()) {
-            glScissor(r.x() - s_virtualScreenGeometry.x(), s_virtualScreenGeometry.height() + s_virtualScreenGeometry.y() - r.y() - r.height(), r.width(), r.height());
+            glScissor((r.x() - s_virtualScreenGeometry.x()) * s_virtualScreenScale,
+                      (s_virtualScreenGeometry.height()  + s_virtualScreenGeometry.y() - r.y() - r.height()) * s_virtualScreenScale,
+                      r.width() * s_virtualScreenScale,
+                      r.height() * s_virtualScreenScale);
             glDrawArrays(primitiveMode, first, count);
         }
     }
diff --git a/scene_opengl.cpp b/scene_opengl.cpp
--- a/scene_opengl.cpp
+++ b/scene_opengl.cpp
@@ -755,6 +755,7 @@
             QRegion repaint = m_backend->prepareRenderingForScreen(i);
             GLVertexBuffer::setVirtualScreenGeometry(geo);
             GLRenderTarget::setVirtualScreenGeometry(geo);
+            GLVertexBuffer::setVirtualScreenScale(screens()->scale(i));
             GLRenderTarget::setVirtualScreenScale(screens()->scale(i));
 
             const GLenum status = glGetGraphicsResetStatus();
@@ -785,6 +786,7 @@
         }
         GLVertexBuffer::setVirtualScreenGeometry(screens()->geometry());
         GLRenderTarget::setVirtualScreenGeometry(screens()->geometry());
+        GLVertexBuffer::setVirtualScreenScale(1);
         GLRenderTarget::setVirtualScreenScale(1);
 
         int mask = 0;