From 1f52366fc1ee617d8dc74bf45767a67ed940bac2 Mon Sep 17 00:00:00 2001
From: =?UTF-8?q?Martin=20Gr=C3=A4=C3=9Flin?= <mgraesslin@kde.org>
Date: Tue, 12 Jun 2012 22:34:29 +0200
Subject: [PATCH] Disable ARB Lanczos Shader for Intel GPUs

For Sandybridge Lanczos Shader is enabled, but only GLSL is working
so the ARB variant has to be disabled for Intel GPUs.

BUG: 301729
FIXED-IN: 4.9.0
REVIEW: 105233
---
 lanczosfilter.cpp | 4 ++++
 1 file changed, 4 insertions(+)

diff --git a/lanczosfilter.cpp b/lanczosfilter.cpp
index 69b9708b9b..295e946e20 100644
--- a/lanczosfilter.cpp
+++ b/lanczosfilter.cpp
@@ -642,6 +642,10 @@ bool LanczosShader::init()
     if (!hasGLExtension("GL_ARB_fragment_program"))
         return false;
 
+    // We allow Lanczos for SandyBridge or later, but only GLSL shaders are supported, see BUG 301729
+    if (gl->isIntel())
+        return false;
+
     QByteArray text;
     QTextStream stream(&text);