Prevented Xorg crash in qtdemo when running corkboards example.

The crash happens in the Nvidia driver in glXReleaseTexImageEXT when
scrolling the corkboard using the mouse. To work around it we detect the
Nvidia driver versions where this is known to be a problem and skip
using the texture from pixmap extension in those cases.

Task-number: QTBUG-12914
Reviewed-by: Trond

2 files changed, 28 insertions, 5 deletions

diff --git a/src/opengl/qgl.cpp b/src/opengl/qgl.cpp
index 4daa866..74bde36 100644
--- a/src/opengl/qgl.cpp
+++ b/src/opengl/qgl.cpp
@@ -1688,6 +1688,10 @@ void QGLContextPrivate::init(QPaintDevice *dev, const QGLFormat &format)
     workaround_needsFullClearOnEveryFrame = false;
     workaround_brokenFBOReadBack = false;
     workaroundsCached = false;
+
+    workaround_brokenTextureFromPixmap = false;
+    workaround_brokenTextureFromPixmap_init = false;
+
     for (int i = 0; i < QT_GL_VERTEX_ARRAY_TRACKED_COUNT; ++i)
         vertexAttributeArraysEnabledState[i] = false;
 }
@@ -2570,11 +2574,27 @@ QGLTexture *QGLContextPrivate::bindTexture(const QPixmap &pixmap, GLenum target,
         && xinfo && xinfo->screen() == pixmap.x11Info().screen()
         && target == GL_TEXTURE_2D)
     {
-        texture = bindTextureFromNativePixmap(const_cast<QPixmap*>(&pixmap), key, options);
-        if (texture) {
-            texture->options |= QGLContext::MemoryManagedBindOption;
-            texture->boundPixmap = pd;
-            boundPixmaps.insert(pd, QPixmap(pixmap));
+        if (!workaround_brokenTextureFromPixmap_init) {
+            workaround_brokenTextureFromPixmap_init = true;
+
+            const QByteArray versionString(reinterpret_cast<const char*>(glGetString(GL_VERSION)));
+            const int pos = versionString.indexOf("NVIDIA ");
+
+            if (pos >= 0) {
+                const QByteArray nvidiaVersionString = versionString.mid(pos + strlen("NVIDIA "));
+
+                if (nvidiaVersionString.startsWith("195") || nvidiaVersionString.startsWith("256"))
+                    workaround_brokenTextureFromPixmap = true;
+            }
+        }
+
+        if (!workaround_brokenTextureFromPixmap) {
+            texture = bindTextureFromNativePixmap(const_cast<QPixmap*>(&pixmap), key, options);
+            if (texture) {
+                texture->options |= QGLContext::MemoryManagedBindOption;
+                texture->boundPixmap = pd;
+                boundPixmaps.insert(pd, QPixmap(pixmap));
+            }
         }
     }
 #endif
diff --git a/src/opengl/qgl_p.h b/src/opengl/qgl_p.h
index 32feacd..ca0d3fa 100644
--- a/src/opengl/qgl_p.h
+++ b/src/opengl/qgl_p.h
@@ -393,6 +393,9 @@ public:
     uint workaround_brokenFBOReadBack : 1;
     uint workaroundsCached : 1;
 
+    uint workaround_brokenTextureFromPixmap : 1;
+    uint workaround_brokenTextureFromPixmap_init : 1;
+
     QPaintDevice *paintDevice;
     QColor transpColor;
     QGLContext *q_ptr;