From a24e92d0b768594aae6a8b4130cf73bb6e741d64 Mon Sep 17 00:00:00 2001
From: Aleix Pol <aleixpol@kde.org>
Date: Thu, 10 Jun 2021 10:06:31 +0200
Subject: [PATCH] blur: Use a custom projection matrix when passing to copy
 sample

The screen projection matrix doesn't necessarily apply to that
framebuffer, so we can't use it.
---
 src/effects/blur/blur.cpp | 5 ++++-
 1 file changed, 4 insertions(+), 1 deletion(-)

diff --git a/src/effects/blur/blur.cpp b/src/effects/blur/blur.cpp
index fae1c39410..4f8983a698 100644
--- a/src/effects/blur/blur.cpp
+++ b/src/effects/blur/blur.cpp
@@ -673,7 +673,10 @@ void BlurEffect::doBlur(const QRegion& shape, const QRect& screen, const float o
             glEnable(GL_FRAMEBUFFER_SRGB);
         }
 
-        copyScreenSampleTexture(vbo, blurRectCount, shape.translated(xTranslate, yTranslate), screenProjection);
+        const QRect screenRect = effects->virtualScreenGeometry();
+        QMatrix4x4 mvp;
+        mvp.ortho(0, screenRect.width(), screenRect.height(), 0, 0, 65535);
+        copyScreenSampleTexture(vbo, blurRectCount, shape.translated(xTranslate, yTranslate), mvp);
     } else {
         m_renderTargets.first()->blitFromFramebuffer(sourceRect, destRect);