From e2d4cba4c8d3f66094b14916912c723d310547cf Mon Sep 17 00:00:00 2001
From: =?UTF-8?q?Martin=20Gr=C3=A4=C3=9Flin?= <kde@martin-graesslin.com>
Date: Sat, 5 Feb 2011 12:06:32 +0100
Subject: [PATCH] Temporarily workaround regression with NVIDIA.

KWin's new shaders fail with NVIDIA and present just a black screen
for the ortho shader (generic shader seems to work). Temporarily
disabling the shaders to force a fallback to old rendering code.

Of course the bug in the shader needs to be fixed.
---
 lib/kwinglutils.cpp | 6 ++++++
 1 file changed, 6 insertions(+)

diff --git a/lib/kwinglutils.cpp b/lib/kwinglutils.cpp
index ff75932a39..49b94167a6 100644
--- a/lib/kwinglutils.cpp
+++ b/lib/kwinglutils.cpp
@@ -23,6 +23,7 @@ along with this program.  If not, see <http://www.gnu.org/licenses/>.
 #ifdef KWIN_HAVE_OPENGL
 #include "kwinglobals.h"
 #include "kwineffects.h"
+#include "kwinglplatform.h"
 
 #include "kdebug.h"
 #include <kstandarddirs.h>
@@ -1182,6 +1183,11 @@ GLShader *ShaderManager::loadShaderFromCode(const QByteArray &vertexSource, cons
 
 void ShaderManager::initShaders()
 {
+    // HACK: the generic shaders fail with NVIDIA's blob
+    // temporarily disable them to force kwin on GL 1.x profile
+    if (GLPlatform::instance()->driver() == Driver_NVidia) {
+        return;
+    }
     m_orthoShader = new GLShader(":/resources/scene-vertex.glsl", ":/resources/scene-fragment.glsl");
     if (m_orthoShader->isValid()) {
         pushShader(SimpleShader, true);