Move QOpenGLFrameBufferObject from QtGui to QtOpenGL

Task-number: QTBUG-74409
Change-Id: I817ea6f052fc61a6465d443450c8017ac5d0c0e9
Reviewed-by: Laszlo Agocs <laszlo.agocs@qt.io>

1 files changed, 196 insertions, 0 deletions

diff --git a/src/opengl/qopenglframebufferobject.h b/src/opengl/qopenglframebufferobject.h
new file mode 100644
index 0000000000..da3347eaec
--- /dev/null
+++ b/src/opengl/qopenglframebufferobject.h
@@ -0,0 +1,196 @@
+/****************************************************************************
+**
+** Copyright (C) 2016 The Qt Company Ltd.
+** Contact: https://www.qt.io/licensing/
+**
+** This file is part of the QtOpenGL 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 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.
+**
+** $QT_END_LICENSE$
+**
+****************************************************************************/
+
+#ifndef QOPENGLFRAMEBUFFEROBJECT_H
+#define QOPENGLFRAMEBUFFEROBJECT_H
+
+#include <QtOpenGL/qtopenglglobal.h>
+
+#include <QtGui/qopengl.h>
+#include <QtGui/qpaintdevice.h>
+
+#include <QtCore/qscopedpointer.h>
+
+#if defined(Q_CLANG_QDOC)
+#undef GLuint
+typedef unsigned int GLuint;
+#undef GLenum
+typedef unsigned int GLenum;
+#undef GL_TEXTURE_2D
+#define GL_TEXTURE_2D 0x0DE1
+#undef GLbitfield
+typedef unsigned int GLbitfield;
+#endif
+
+QT_BEGIN_NAMESPACE
+
+class QOpenGLFramebufferObjectPrivate;
+class QOpenGLFramebufferObjectFormat;
+
+class Q_OPENGL_EXPORT QOpenGLFramebufferObject
+{
+    Q_DECLARE_PRIVATE(QOpenGLFramebufferObject)
+public:
+    enum Attachment {
+        NoAttachment,
+        CombinedDepthStencil,
+        Depth
+    };
+
+    explicit QOpenGLFramebufferObject(const QSize &size, GLenum target = GL_TEXTURE_2D);
+    QOpenGLFramebufferObject(int width, int height, GLenum target = GL_TEXTURE_2D);
+
+    QOpenGLFramebufferObject(const QSize &size, Attachment attachment,
+                         GLenum target = GL_TEXTURE_2D, GLenum internalFormat = 0);
+    QOpenGLFramebufferObject(int width, int height, Attachment attachment,
+                         GLenum target = GL_TEXTURE_2D, GLenum internalFormat = 0);
+
+    QOpenGLFramebufferObject(const QSize &size, const QOpenGLFramebufferObjectFormat &format);
+    QOpenGLFramebufferObject(int width, int height, const QOpenGLFramebufferObjectFormat &format);
+
+    virtual ~QOpenGLFramebufferObject();
+
+    void addColorAttachment(const QSize &size, GLenum internalFormat = 0);
+    void addColorAttachment(int width, int height, GLenum internalFormat = 0);
+
+    QOpenGLFramebufferObjectFormat format() const;
+
+    bool isValid() const;
+    bool isBound() const;
+    bool bind();
+    bool release();
+
+    int width() const { return size().width(); }
+    int height() const { return size().height(); }
+
+    GLuint texture() const;
+    QVector<GLuint> textures() const;
+
+    GLuint takeTexture();
+    GLuint takeTexture(int colorAttachmentIndex);
+
+    QSize size() const;
+    QVector<QSize> sizes() const;
+
+    QImage toImage() const;
+    QImage toImage(bool flipped) const;
+    QImage toImage(bool flipped, int colorAttachmentIndex) const;
+
+    Attachment attachment() const;
+    void setAttachment(Attachment attachment);
+
+    GLuint handle() const;
+
+    static bool bindDefault();
+
+    static bool hasOpenGLFramebufferObjects();
+
+    static bool hasOpenGLFramebufferBlit();
+
+    enum FramebufferRestorePolicy {
+        DontRestoreFramebufferBinding,
+        RestoreFramebufferBindingToDefault,
+        RestoreFrameBufferBinding
+    };
+
+    static void blitFramebuffer(QOpenGLFramebufferObject *target, const QRect &targetRect,
+                                QOpenGLFramebufferObject *source, const QRect &sourceRect,
+                                GLbitfield buffers,
+                                GLenum filter,
+                                int readColorAttachmentIndex,
+                                int drawColorAttachmentIndex,
+                                FramebufferRestorePolicy restorePolicy);
+    static void blitFramebuffer(QOpenGLFramebufferObject *target, const QRect &targetRect,
+                                QOpenGLFramebufferObject *source, const QRect &sourceRect,
+                                GLbitfield buffers,
+                                GLenum filter,
+                                int readColorAttachmentIndex,
+                                int drawColorAttachmentIndex);
+    static void blitFramebuffer(QOpenGLFramebufferObject *target, const QRect &targetRect,
+                                QOpenGLFramebufferObject *source, const QRect &sourceRect,
+                                GLbitfield buffers = GL_COLOR_BUFFER_BIT,
+                                GLenum filter = GL_NEAREST);
+    static void blitFramebuffer(QOpenGLFramebufferObject *target,
+                                QOpenGLFramebufferObject *source,
+                                GLbitfield buffers = GL_COLOR_BUFFER_BIT,
+                                GLenum filter = GL_NEAREST);
+
+private:
+    Q_DISABLE_COPY(QOpenGLFramebufferObject)
+    QScopedPointer<QOpenGLFramebufferObjectPrivate> d_ptr;
+    friend class QOpenGLPaintDevice;
+    friend class QOpenGLFBOGLPaintDevice;
+};
+
+class QOpenGLFramebufferObjectFormatPrivate;
+class Q_OPENGL_EXPORT QOpenGLFramebufferObjectFormat
+{
+public:
+    QOpenGLFramebufferObjectFormat();
+    QOpenGLFramebufferObjectFormat(const QOpenGLFramebufferObjectFormat &other);
+    QOpenGLFramebufferObjectFormat &operator=(const QOpenGLFramebufferObjectFormat &other);
+    ~QOpenGLFramebufferObjectFormat();
+
+    void setSamples(int samples);
+    int samples() const;
+
+    void setMipmap(bool enabled);
+    bool mipmap() const;
+
+    void setAttachment(QOpenGLFramebufferObject::Attachment attachment);
+    QOpenGLFramebufferObject::Attachment attachment() const;
+
+    void setTextureTarget(GLenum target);
+    GLenum textureTarget() const;
+
+    void setInternalTextureFormat(GLenum internalTextureFormat);
+    GLenum internalTextureFormat() const;
+
+    bool operator==(const QOpenGLFramebufferObjectFormat& other) const;
+    bool operator!=(const QOpenGLFramebufferObjectFormat& other) const;
+
+private:
+    QOpenGLFramebufferObjectFormatPrivate *d;
+
+    void detach();
+};
+
+QT_END_NAMESPACE
+
+#endif // QOPENGLFRAMEBUFFEROBJECT_H