QWindowContext / QWindowFormat refactor.

To enable having a single GL context used for multiple drawables we need
to de-couple the context class a bit more from the window class in the
plugin API. Now contexts are created stand-alone based on a GL format
and a share context, and when calling makeCurrent() a desired surface
is specified. This maps well to GLX, EGL, Cocoa, AGL, and WGL, which all
support this use case.

QWindowContext is renamed to QGuiGLContext, and QWindowFormat is renamed
to QGuiGLFormat. We have the ability to introduce a pbuffer or similar
other offscreen GL drawable abstraction in the future.

1 files changed, 152 insertions, 0 deletions

diff --git a/src/gui/kernel/qguiglformat_qpa.h b/src/gui/kernel/qguiglformat_qpa.h
new file mode 100644
index 0000000000..a14a8256b6
--- /dev/null
+++ b/src/gui/kernel/qguiglformat_qpa.h
@@ -0,0 +1,152 @@
+/****************************************************************************
+**
+** Copyright (C) 2011 Nokia Corporation and/or its subsidiary(-ies).
+** All rights reserved.
+** Contact: Nokia Corporation (qt-info@nokia.com)
+**
+** This file is part of the QtGui module of the Qt Toolkit.
+**
+** $QT_BEGIN_LICENSE:LGPL$
+** No Commercial Usage
+** This file contains pre-release code and may not be distributed.
+** You may use this file in accordance with the terms and conditions
+** contained in the Technology Preview License Agreement accompanying
+** this package.
+**
+** 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, Nokia gives you certain additional
+** rights.  These rights are described in the Nokia Qt LGPL Exception
+** version 1.1, included in the file LGPL_EXCEPTION.txt in this package.
+**
+** If you have questions regarding the use of this file, please contact
+** Nokia at qt-info@nokia.com.
+**
+**
+**
+**
+**
+**
+**
+**
+** $QT_END_LICENSE$
+**
+****************************************************************************/
+#ifndef QGUIGLFORMAT_QPA_H
+#define QGUIGLFORMAT_QPA_H
+
+#include <qglobal.h>
+
+QT_BEGIN_HEADER
+
+QT_BEGIN_NAMESPACE
+
+QT_MODULE(Gui)
+
+class QGuiGLContext;
+class QGuiGLFormatPrivate;
+
+class Q_GUI_EXPORT QGuiGLFormat
+{
+public:
+    enum FormatOption {
+        StereoBuffers           = 0x0001,
+        WindowSurface           = 0x0002
+    };
+    Q_DECLARE_FLAGS(FormatOptions, FormatOption)
+
+    enum SwapBehavior {
+        DefaultSwapBehavior,
+        SingleBuffer,
+        DoubleBuffer,
+        TripleBuffer
+    };
+
+    enum OpenGLContextProfile {
+        NoProfile,
+        CoreProfile,
+        CompatibilityProfile
+    };
+
+    QGuiGLFormat();
+    QGuiGLFormat(FormatOptions options);
+    QGuiGLFormat(const QGuiGLFormat &other);
+    QGuiGLFormat &operator=(const QGuiGLFormat &other);
+    ~QGuiGLFormat();
+
+    void setDepthBufferSize(int size);
+    int depthBufferSize() const;
+
+    void setStencilBufferSize(int size);
+    int stencilBufferSize() const;
+
+    void setRedBufferSize(int size);
+    int redBufferSize() const;
+    void setGreenBufferSize(int size);
+    int greenBufferSize() const;
+    void setBlueBufferSize(int size);
+    int blueBufferSize() const;
+    void setAlphaBufferSize(int size);
+    int alphaBufferSize() const;
+
+    void setSamples(int numSamples);
+    int samples() const;
+
+    void setSwapBehavior(SwapBehavior behavior);
+    SwapBehavior swapBehavior() const;
+
+    bool hasAlpha() const;
+
+    void setProfile(OpenGLContextProfile profile);
+    OpenGLContextProfile profile() const;
+
+    bool stereo() const;
+    void setStereo(bool enable);
+    bool windowSurface() const;
+    void setWindowSurface(bool enable);
+
+    void setOption(QGuiGLFormat::FormatOptions opt);
+    bool testOption(QGuiGLFormat::FormatOptions opt) const;
+
+private:
+    QGuiGLFormatPrivate *d;
+
+    void detach();
+
+    friend Q_GUI_EXPORT bool operator==(const QGuiGLFormat&, const QGuiGLFormat&);
+    friend Q_GUI_EXPORT bool operator!=(const QGuiGLFormat&, const QGuiGLFormat&);
+#ifndef QT_NO_DEBUG_STREAM
+    friend Q_GUI_EXPORT QDebug operator<<(QDebug, const QGuiGLFormat &);
+#endif
+};
+
+Q_GUI_EXPORT bool operator==(const QGuiGLFormat&, const QGuiGLFormat&);
+Q_GUI_EXPORT bool operator!=(const QGuiGLFormat&, const QGuiGLFormat&);
+
+#ifndef QT_NO_DEBUG_STREAM
+Q_GUI_EXPORT QDebug operator<<(QDebug, const QGuiGLFormat &);
+#endif
+
+Q_DECLARE_OPERATORS_FOR_FLAGS(QGuiGLFormat::FormatOptions)
+
+inline bool QGuiGLFormat::stereo() const
+{
+    return testOption(QGuiGLFormat::StereoBuffers);
+}
+
+inline bool QGuiGLFormat::windowSurface() const
+{
+    return testOption(QGuiGLFormat::WindowSurface);
+}
+
+QT_END_NAMESPACE
+
+QT_END_HEADER
+
+#endif //QGUIGLFORMAT_QPA_H