Add support for OpenGL ES 3.2 in QOpenGLExtraFunctions

Follow the usual pattern:

Add a config test and automatic include of GLES3/gl32.h if there
is a GLES 3.2 capable header+lib at build time.

Then, regardless of this being enabled, expose all new 3.2 API
functions in QOpenGLExtraFunctions and resolve them dynamically
at run time.

This way 3.2 functions will be available when deployed to a 3.2
capable system (or OpenGL 3/4.x with the functions in question
available) regardless of what was present in the sysroot at build
time.

Change-Id: Ia52551f3178591e1e56ceac8e45d89c6b13f4927
Reviewed-by: Sean Harmer <sean.harmer@kdab.com>

2 files changed, 54 insertions, 0 deletions

diff --git a/config.tests/unix/opengles32/opengles32.cpp b/config.tests/unix/opengles32/opengles32.cpp
new file mode 100644
index 0000000000..0505510464
--- /dev/null
+++ b/config.tests/unix/opengles32/opengles32.cpp
@@ -0,0 +1,47 @@
+/****************************************************************************
+**
+** Copyright (C) 2017 The Qt Company Ltd.
+** Contact: https://www.qt.io/licensing/
+**
+** This file is part of the config.tests 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 The Qt Company. For licensing terms
+** and conditions see https://www.qt.io/terms-conditions. For further
+** information use the contact form at https://www.qt.io/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 3 as published by the Free Software
+** Foundation and appearing in the file LICENSE.LGPL3 included in the
+** packaging of this file. Please review the following information to
+** ensure the GNU Lesser General Public License version 3 requirements
+** will be met: https://www.gnu.org/licenses/lgpl-3.0.html.
+**
+** GNU General Public License Usage
+** Alternatively, this file may be used under the terms of the GNU
+** General Public License version 2.0 or (at your option) the GNU General
+** Public license version 3 or any later version approved by the KDE Free
+** Qt Foundation. The licenses are as published by the Free Software
+** Foundation and appearing in the file LICENSE.GPL2 and LICENSE.GPL3
+** included in the packaging of this file. Please review the following
+** information to ensure the GNU General Public License requirements will
+** be met: https://www.gnu.org/licenses/gpl-2.0.html and
+** https://www.gnu.org/licenses/gpl-3.0.html.
+**
+** $QT_END_LICENSE$
+**
+****************************************************************************/
+
+#include <GLES3/gl32.h>
+
+int main(int, char **)
+{
+    glFramebufferTexture(GL_TEXTURE_2D, GL_DEPTH_STENCIL_ATTACHMENT, 1, 0);
+
+    return 0;
+}
diff --git a/config.tests/unix/opengles32/opengles32.pro b/config.tests/unix/opengles32/opengles32.pro
new file mode 100644
index 0000000000..c95ba83364
--- /dev/null
+++ b/config.tests/unix/opengles32/opengles32.pro
@@ -0,0 +1,7 @@
+# The library is expected to be the same as in ES 2.0 (libGLESv2).
+# The difference is the header and the presence of the functions in
+# the library.
+
+SOURCES = opengles32.cpp
+
+CONFIG -= qt