From 12867bb8e2bf56e9397ee6b6014e176fdab6e86f Mon Sep 17 00:00:00 2001
From: Giuseppe D'Angelo <giuseppe.dangelo@kdab.com>
Date: Tue, 29 Jul 2014 12:36:30 +0200
Subject: QOpenGLVAO: refactor the helper class and export it

It is useful in other places, for instance in QtQuick, to avoid
duplicating the same resolver logic.

Change-Id: I9748a420a0abeb07cc84f948965b1e0321a95ca2
Reviewed-by: Marc Mutz <marc.mutz@kdab.com>
Reviewed-by: Laszlo Agocs <laszlo.agocs@digia.com>
---
 src/gui/opengl/qopenglvertexarrayobject_p.h | 119 ++++++++++++++++++++++++++++
 1 file changed, 119 insertions(+)
 create mode 100644 src/gui/opengl/qopenglvertexarrayobject_p.h

(limited to 'src/gui/opengl/qopenglvertexarrayobject_p.h')

diff --git a/src/gui/opengl/qopenglvertexarrayobject_p.h b/src/gui/opengl/qopenglvertexarrayobject_p.h
new file mode 100644
index 0000000000..161a388b1a
--- /dev/null
+++ b/src/gui/opengl/qopenglvertexarrayobject_p.h
@@ -0,0 +1,119 @@
+/****************************************************************************
+**
+** Copyright (C) 2014 Klarälvdalens Datakonsult AB, a KDAB Group company, info@kdab.com, author Sean Harmer <sean.harmer@kdab.com>
+** Contact: http://www.qt-project.org/legal
+**
+** This file is part of the QtGui module of the Qt Toolkit.
+**
+** $QT_BEGIN_LICENSE:LGPL$
+** Commercial License Usage
+** Licensees holding valid commercial Qt licenses may use this file in
+** accordance with the commercial license agreement provided with the
+** Software or, alternatively, in accordance with the terms contained in
+** a written agreement between you and Digia.  For licensing terms and
+** conditions see http://qt.digia.com/licensing.  For further information
+** use the contact form at http://qt.digia.com/contact-us.
+**
+** GNU Lesser General Public License Usage
+** Alternatively, this file may be used under the terms of the GNU Lesser
+** General Public License version 2.1 as published by the Free Software
+** Foundation and appearing in the file LICENSE.LGPL included in the
+** packaging of this file.  Please review the following information to
+** ensure the GNU Lesser General Public License version 2.1 requirements
+** will be met: http://www.gnu.org/licenses/old-licenses/lgpl-2.1.html.
+**
+** In addition, as a special exception, Digia gives you certain additional
+** rights.  These rights are described in the Digia Qt LGPL Exception
+** version 1.1, included in the file LGPL_EXCEPTION.txt in this package.
+**
+** GNU General Public License Usage
+** Alternatively, this file may be used under the terms of the GNU
+** General Public License version 3.0 as published by the Free Software
+** Foundation and appearing in the file LICENSE.GPL included in the
+** packaging of this file.  Please review the following information to
+** ensure the GNU General Public License version 3.0 requirements will be
+** met: http://www.gnu.org/copyleft/gpl.html.
+**
+**
+** $QT_END_LICENSE$
+**
+****************************************************************************/
+
+#ifndef QOPENGLVERTEXARRAYOBJECT_P_H
+#define QOPENGLVERTEXARRAYOBJECT_P_H
+
+//
+//  W A R N I N G
+//  -------------
+//
+// This file is not part of the Qt API.  It exists for the convenience
+// of the Qt OpenGL classes.  This header file may change from
+// version to version without notice, or even be removed.
+//
+// We mean it.
+//
+
+#include <QtCore/qglobal.h>
+
+#ifndef QT_NO_OPENGL
+
+#include <QtGui/qopengl.h>
+
+QT_BEGIN_NAMESPACE
+
+class QOpenGLVertexArrayObjectHelper;
+class QOpenGLContext;
+
+void Q_GUI_EXPORT qtInitializeVertexArrayObjectHelper(QOpenGLVertexArrayObjectHelper *helper, QOpenGLContext *context);
+
+class QOpenGLVertexArrayObjectHelper
+{
+    Q_DISABLE_COPY(QOpenGLVertexArrayObjectHelper)
+
+public:
+    explicit inline QOpenGLVertexArrayObjectHelper(QOpenGLContext *context)
+        : GenVertexArrays(Q_NULLPTR)
+        , DeleteVertexArrays(Q_NULLPTR)
+        , BindVertexArray(Q_NULLPTR)
+    {
+        qtInitializeVertexArrayObjectHelper(this, context);
+    }
+
+    inline bool isValid() const
+    {
+        return GenVertexArrays && DeleteVertexArrays && BindVertexArray;
+    }
+
+    inline void glGenVertexArrays(GLsizei n, GLuint *arrays) const
+    {
+        GenVertexArrays(n, arrays);
+    }
+
+    inline void glDeleteVertexArrays(GLsizei n, const GLuint *arrays) const
+    {
+        DeleteVertexArrays(n, arrays);
+    }
+
+    inline void glBindVertexArray(GLuint array) const
+    {
+        BindVertexArray(array);
+    }
+
+private:
+    friend void Q_GUI_EXPORT qtInitializeVertexArrayObjectHelper(QOpenGLVertexArrayObjectHelper *helper, QOpenGLContext *context);
+
+    // Function signatures are equivalent between desktop core, ARB, APPLE, ES 3 and ES 2 extensions
+    typedef void (QOPENGLF_APIENTRYP qt_GenVertexArrays_t)(GLsizei n, GLuint *arrays);
+    typedef void (QOPENGLF_APIENTRYP qt_DeleteVertexArrays_t)(GLsizei n, const GLuint *arrays);
+    typedef void (QOPENGLF_APIENTRYP qt_BindVertexArray_t)(GLuint array);
+
+    qt_GenVertexArrays_t GenVertexArrays;
+    qt_DeleteVertexArrays_t DeleteVertexArrays;
+    qt_BindVertexArray_t BindVertexArray;
+};
+
+QT_END_NAMESPACE
+
+#endif // QT_NO_OPENGL
+
+#endif // QOPENGLVERTEXARRAYOBJECT_P_H
-- 
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