Fixed crash in tst_QGL::multipleFBOInterleavedRendering().

Properly check for the ElementIndexUint extension.

Change-Id: I8117aa052f2dd697a2dadeb7ce84a415b5fd24c8
Reviewed-on: http://codereview.qt.nokia.com/4311
Reviewed-by: Qt Sanity Bot <qt_sanity_bot@ovi.com>
Reviewed-by: Gunnar Sletta <gunnar.sletta@nokia.com>

3 files changed, 32 insertions, 29 deletions

diff --git a/src/gui/opengl/qopenglpaintengine.cpp b/src/gui/opengl/qopenglpaintengine.cpp
index 6b9878edf3..dfb8549375 100644
--- a/src/gui/opengl/qopenglpaintengine.cpp
+++ b/src/gui/opengl/qopenglpaintengine.cpp
@@ -666,6 +666,7 @@ struct QOpenGL2PEVectorPathCache
     int indexCount;
     GLenum primitiveType;
     qreal iscale;
+    QVertexIndexVector::Type indexType;
 };
 
 void QOpenGL2PaintEngineExPrivate::cleanupVectorPath(QPaintEngineEx *engine, void *data)
@@ -823,13 +824,14 @@ void QOpenGL2PaintEngineExPrivate::fill(const QVectorPath& path)
                 cache->indexCount = polys.indices.size();
                 cache->primitiveType = GL_TRIANGLES;
                 cache->iscale = inverseScale;
+                cache->indexType = polys.indices.type();
 #ifdef QT_OPENGL_CACHE_AS_VBOS
                 glGenBuffers(1, &cache->vbo);
                 glGenBuffers(1, &cache->ibo);
                 glBindBuffer(GL_ARRAY_BUFFER, cache->vbo);
                 glBindBuffer(GL_ELEMENT_ARRAY_BUFFER, cache->ibo);
 
-                if (funcs.hasOpenGLExtension(QOpenGLExtensions::ElementIndexUint))
+                if (polys.indices.type() == QVertexIndexVector::UnsignedInt)
                     funcs.glBufferData(GL_ELEMENT_ARRAY_BUFFER, sizeof(quint32) * polys.indices.size(), polys.indices.data(), GL_STATIC_DRAW);
                 else
                     funcs.glBufferData(GL_ELEMENT_ARRAY_BUFFER, sizeof(quint16) * polys.indices.size(), polys.indices.data(), GL_STATIC_DRAW);
@@ -840,7 +842,7 @@ void QOpenGL2PaintEngineExPrivate::fill(const QVectorPath& path)
                 funcs.glBufferData(GL_ARRAY_BUFFER, sizeof(float) * vertices.size(), vertices.data(), GL_STATIC_DRAW);
 #else
                 cache->vertices = (float *) qMalloc(sizeof(float) * polys.vertices.size());
-                if (funcs.hasOpenGLExtension(QOpenGLExtensions::ElementIndexUint)) {
+                if (polys.indices.type() == QVertexIndexVector::UnsignedInt) {
                     cache->indices = (quint32 *) qMalloc(sizeof(quint32) * polys.indices.size());
                     memcpy(cache->indices, polys.indices.data(), sizeof(quint32) * polys.indices.size());
                 } else {
@@ -857,7 +859,7 @@ void QOpenGL2PaintEngineExPrivate::fill(const QVectorPath& path)
             glBindBuffer(GL_ARRAY_BUFFER, cache->vbo);
             glBindBuffer(GL_ELEMENT_ARRAY_BUFFER, cache->ibo);
             setVertexAttributePointer(QT_VERTEX_COORDS_ATTR, 0);
-            if (funcs.hasOpenGLExtension(QOpenGLExtensions::ElementIndexUint))
+            if (cache->indexType == QVertexIndexVector::UnsignedInt)
                 glDrawElements(cache->primitiveType, cache->indexCount, GL_UNSIGNED_INT, 0);
             else
                 glDrawElements(cache->primitiveType, cache->indexCount, GL_UNSIGNED_SHORT, 0);
@@ -865,7 +867,7 @@ void QOpenGL2PaintEngineExPrivate::fill(const QVectorPath& path)
             glBindBuffer(GL_ARRAY_BUFFER, 0);
 #else
             setVertexAttributePointer(QT_VERTEX_COORDS_ATTR, cache->vertices);
-            if (funcs.hasOpenGLExtension(QOpenGLExtensions::ElementIndexUint))
+            if (cache->indexType == QVertexIndexVector::UnsignedInt)
                 glDrawElements(cache->primitiveType, cache->indexCount, GL_UNSIGNED_INT, (qint32 *)cache->indices);
             else
                 glDrawElements(cache->primitiveType, cache->indexCount, GL_UNSIGNED_SHORT, (qint16 *)cache->indices);
diff --git a/src/gui/opengl/qtriangulator.cpp b/src/gui/opengl/qtriangulator.cpp
index d66b2ac9a5..67c2a6494e 100644
--- a/src/gui/opengl/qtriangulator.cpp
+++ b/src/gui/opengl/qtriangulator.cpp
@@ -55,6 +55,7 @@
 #include <QtCore/qalgorithms.h>
 
 #include <private/qopenglcontext_p.h>
+#include <private/qopenglextensions_p.h>
 #include <private/qrbtree_p.h>
 
 #include <math.h>
@@ -2508,12 +2509,19 @@ void QTriangulator<T>::MonotoneToTriangles::decompose()
 //                                qTriangulate                                //
 //============================================================================//
 
+static bool hasElementIndexUint()
+{
+    QOpenGLContext *context = QOpenGLContext::currentContext();
+    if (!context)
+        return false;
+    return static_cast<QOpenGLExtensions *>(context->functions())->hasOpenGLExtension(QOpenGLExtensions::ElementIndexUint);
+}
+
 Q_GUI_EXPORT QTriangleSet qTriangulate(const qreal *polygon,
                           int count, uint hint, const QTransform &matrix)
 {
     QTriangleSet triangleSet;
-#if 0
-    if (QOpenGLExtensions::glExtensions() & QOpenGLExtensions::ElementIndexUint) {
+    if (hasElementIndexUint()) {
         QTriangulator<quint32> triangulator;
         triangulator.initialize(polygon, count, hint, matrix);
         QVertexSet<quint32> vertexSet = triangulator.triangulate();
@@ -2521,13 +2529,12 @@ Q_GUI_EXPORT QTriangleSet qTriangulate(const qreal *polygon,
         triangleSet.indices.setDataUint(vertexSet.indices);
 
     } else {
-#endif
         QTriangulator<quint16> triangulator;
         triangulator.initialize(polygon, count, hint, matrix);
         QVertexSet<quint16> vertexSet = triangulator.triangulate();
         triangleSet.vertices = vertexSet.vertices;
         triangleSet.indices.setDataUshort(vertexSet.indices);
-//    }
+    }
     return triangleSet;
 }
 
@@ -2535,21 +2542,19 @@ Q_GUI_EXPORT QTriangleSet qTriangulate(const QVectorPath &path,
                           const QTransform &matrix, qreal lod)
 {
     QTriangleSet triangleSet;
-#if 0
-    if (QOpenGLExtensions::glExtensions() & QOpenGLExtensions::ElementIndexUint) {
+    if (hasElementIndexUint()) {
         QTriangulator<quint32> triangulator;
         triangulator.initialize(path, matrix, lod);
         QVertexSet<quint32> vertexSet = triangulator.triangulate();
         triangleSet.vertices = vertexSet.vertices;
         triangleSet.indices.setDataUint(vertexSet.indices);
     } else {
-#endif
         QTriangulator<quint16> triangulator;
         triangulator.initialize(path, matrix, lod);
         QVertexSet<quint16> vertexSet = triangulator.triangulate();
         triangleSet.vertices = vertexSet.vertices;
         triangleSet.indices.setDataUshort(vertexSet.indices);
-//    }
+    }
     return triangleSet;
 }
 
@@ -2557,21 +2562,19 @@ QTriangleSet qTriangulate(const QPainterPath &path,
                           const QTransform &matrix, qreal lod)
 {
     QTriangleSet triangleSet;
-#if 0
-    if (QOpenGLExtensions::glExtensions() & QOpenGLExtensions::ElementIndexUint) {
+    if (hasElementIndexUint()) {
         QTriangulator<quint32> triangulator;
         triangulator.initialize(path, matrix, lod);
         QVertexSet<quint32> vertexSet = triangulator.triangulate();
         triangleSet.vertices = vertexSet.vertices;
         triangleSet.indices.setDataUint(vertexSet.indices);
     } else {
-#endif
         QTriangulator<quint16> triangulator;
         triangulator.initialize(path, matrix, lod);
         QVertexSet<quint16> vertexSet = triangulator.triangulate();
         triangleSet.vertices = vertexSet.vertices;
         triangleSet.indices.setDataUshort(vertexSet.indices);
-//    }
+    }
     return triangleSet;
 }
 
@@ -2579,21 +2582,19 @@ QPolylineSet qPolyline(const QVectorPath &path,
                        const QTransform &matrix, qreal lod)
 {
     QPolylineSet polyLineSet;
-#if 0
-    if (QOpenGLExtensions::glExtensions() & QOpenGLExtensions::ElementIndexUint) {
+    if (hasElementIndexUint()) {
         QTriangulator<quint32> triangulator;
         triangulator.initialize(path, matrix, lod);
         QVertexSet<quint32> vertexSet = triangulator.polyline();
         polyLineSet.vertices = vertexSet.vertices;
         polyLineSet.indices.setDataUint(vertexSet.indices);
     } else {
-#endif
         QTriangulator<quint16> triangulator;
         triangulator.initialize(path, matrix, lod);
         QVertexSet<quint16> vertexSet = triangulator.polyline();
         polyLineSet.vertices = vertexSet.vertices;
         polyLineSet.indices.setDataUshort(vertexSet.indices);
-//    }
+    }
     return polyLineSet;
 }
 
@@ -2601,21 +2602,19 @@ QPolylineSet qPolyline(const QPainterPath &path,
                        const QTransform &matrix, qreal lod)
 {
     QPolylineSet polyLineSet;
-#if 0
-    if (QOpenGLExtensions::glExtensions() & QOpenGLExtensions::ElementIndexUint) {
+    if (hasElementIndexUint()) {
         QTriangulator<quint32> triangulator;
         triangulator.initialize(path, matrix, lod);
         QVertexSet<quint32> vertexSet = triangulator.polyline();
         polyLineSet.vertices = vertexSet.vertices;
         polyLineSet.indices.setDataUint(vertexSet.indices);
     } else {
-#endif
         QTriangulator<quint16> triangulator;
         triangulator.initialize(path, matrix, lod);
         QVertexSet<quint16> vertexSet = triangulator.polyline();
         polyLineSet.vertices = vertexSet.vertices;
         polyLineSet.indices.setDataUshort(vertexSet.indices);
-//    }
+    }
     return polyLineSet;
 }
 
diff --git a/src/opengl/gl2paintengineex/qpaintengineex_opengl2.cpp b/src/opengl/gl2paintengineex/qpaintengineex_opengl2.cpp
index 854b71a153..e6a12cd40c 100644
--- a/src/opengl/gl2paintengineex/qpaintengineex_opengl2.cpp
+++ b/src/opengl/gl2paintengineex/qpaintengineex_opengl2.cpp
@@ -667,6 +667,7 @@ struct QGL2PEVectorPathCache
     int indexCount;
     GLenum primitiveType;
     qreal iscale;
+    QVertexIndexVector::Type indexType;
 };
 
 void QGL2PaintEngineExPrivate::cleanupVectorPath(QPaintEngineEx *engine, void *data)
@@ -824,13 +825,14 @@ void QGL2PaintEngineExPrivate::fill(const QVectorPath& path)
                 cache->indexCount = polys.indices.size();
                 cache->primitiveType = GL_TRIANGLES;
                 cache->iscale = inverseScale;
+                cache->indexType = polys.indices.type();
 #ifdef QT_OPENGL_CACHE_AS_VBOS
                 glGenBuffers(1, &cache->vbo);
                 glGenBuffers(1, &cache->ibo);
                 glBindBuffer(GL_ARRAY_BUFFER, cache->vbo);
                 glBindBuffer(GL_ELEMENT_ARRAY_BUFFER, cache->ibo);
 
-                if (QGLExtensions::glExtensions() & QGLExtensions::ElementIndexUint)
+                if (polys.indices.type() == QVertexIndexVector::UnsignedInt)
                     glBufferData(GL_ELEMENT_ARRAY_BUFFER, sizeof(quint32) * polys.indices.size(), polys.indices.data(), GL_STATIC_DRAW);
                 else
                     glBufferData(GL_ELEMENT_ARRAY_BUFFER, sizeof(quint16) * polys.indices.size(), polys.indices.data(), GL_STATIC_DRAW);
@@ -841,7 +843,7 @@ void QGL2PaintEngineExPrivate::fill(const QVectorPath& path)
                 glBufferData(GL_ARRAY_BUFFER, sizeof(float) * vertices.size(), vertices.data(), GL_STATIC_DRAW);
 #else
                 cache->vertices = (float *) qMalloc(sizeof(float) * polys.vertices.size());
-                if (QGLExtensions::glExtensions() & QGLExtensions::ElementIndexUint) {
+                if (polys.indices.type() == QVertexIndexVector::UnsignedInt) {
                     cache->indices = (quint32 *) qMalloc(sizeof(quint32) * polys.indices.size());
                     memcpy(cache->indices, polys.indices.data(), sizeof(quint32) * polys.indices.size());
                 } else {
@@ -858,7 +860,7 @@ void QGL2PaintEngineExPrivate::fill(const QVectorPath& path)
             glBindBuffer(GL_ARRAY_BUFFER, cache->vbo);
             glBindBuffer(GL_ELEMENT_ARRAY_BUFFER, cache->ibo);
             setVertexAttributePointer(QT_VERTEX_COORDS_ATTR, 0);
-            if (QGLExtensions::glExtensions() & QGLExtensions::ElementIndexUint)
+            if (cache->indexType == QVertexIndexVector::UnsignedInt)
                 glDrawElements(cache->primitiveType, cache->indexCount, GL_UNSIGNED_INT, 0);
             else
                 glDrawElements(cache->primitiveType, cache->indexCount, GL_UNSIGNED_SHORT, 0);
@@ -866,7 +868,7 @@ void QGL2PaintEngineExPrivate::fill(const QVectorPath& path)
             glBindBuffer(GL_ARRAY_BUFFER, 0);
 #else
             setVertexAttributePointer(QT_VERTEX_COORDS_ATTR, cache->vertices);
-            if (QGLExtensions::glExtensions() & QGLExtensions::ElementIndexUint)
+            if (cache->indexType == QVertexIndexVector::UnsignedInt)
                 glDrawElements(cache->primitiveType, cache->indexCount, GL_UNSIGNED_INT, (qint32 *)cache->indices);
             else
                 glDrawElements(cache->primitiveType, cache->indexCount, GL_UNSIGNED_SHORT, (qint16 *)cache->indices);
@@ -895,7 +897,7 @@ void QGL2PaintEngineExPrivate::fill(const QVectorPath& path)
 
                     prepareForDraw(currentBrush.isOpaque());
                     setVertexAttributePointer(QT_VERTEX_COORDS_ATTR, vertices.constData());
-                    if (QGLExtensions::glExtensions() & QGLExtensions::ElementIndexUint)
+                    if (polys.indices.type() == QVertexIndexVector::UnsignedInt)
                         glDrawElements(GL_TRIANGLES, polys.indices.size(), GL_UNSIGNED_INT, polys.indices.data());
                     else
                         glDrawElements(GL_TRIANGLES, polys.indices.size(), GL_UNSIGNED_SHORT, polys.indices.data());