Merge pull request #4 from FOSSEE/develop

merging dev into master

1 files changed, 109 insertions, 0 deletions

diff --git a/include/gal/opengl/opengl_compositor.h b/include/gal/opengl/opengl_compositor.h
new file mode 100644
index 0000000..c06add7
--- /dev/null
+++ b/include/gal/opengl/opengl_compositor.h
@@ -0,0 +1,109 @@
+/*
+ * This program source code file is part of KiCad, a free EDA CAD application.
+ *
+ * Copyright (C) 2013 CERN
+ * @author Maciej Suminski <maciej.suminski@cern.ch>
+ *
+ * This program is free software; you can redistribute it and/or
+ * modify it under the terms of the GNU General Public License
+ * as published by the Free Software Foundation; either version 2
+ * of the License, or (at your option) any later version.
+ *
+ * This program is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+ * GNU General Public License for more details.
+ *
+ * You should have received a copy of the GNU General Public License
+ * along with this program; if not, you may find one here:
+ * http://www.gnu.org/licenses/old-licenses/gpl-2.0.html
+ * or you may search the http://www.gnu.org website for the version 2 license,
+ * or you may write to the Free Software Foundation, Inc.,
+ * 51 Franklin Street, Fifth Floor, Boston, MA  02110-1301, USA
+ */
+
+/**
+ * @file opengl_compositor.h
+ * @brief Class that handles multitarget rendering (ie. to different textures/surfaces) and
+ * later compositing into a single image (OpenGL flavour).
+ */
+
+#ifndef OPENGL_COMPOSITOR_H_
+#define OPENGL_COMPOSITOR_H_
+
+#include <gal/compositor.h>
+#include <GL/glew.h>
+#include <deque>
+
+namespace KIGFX
+{
+class OPENGL_COMPOSITOR : public COMPOSITOR
+{
+public:
+    OPENGL_COMPOSITOR();
+    virtual ~OPENGL_COMPOSITOR();
+
+    /// @copydoc COMPOSITOR::Initialize()
+    virtual void Initialize();
+
+    /// @copydoc COMPOSITOR::Resize()
+    virtual void Resize( unsigned int aWidth, unsigned int aHeight );
+
+    /// @copydoc COMPOSITOR::CreateBuffer()
+    virtual unsigned int CreateBuffer();
+
+    /// @copydoc COMPOSITOR::SetBuffer()
+    virtual void SetBuffer( unsigned int aBufferHandle );
+
+    /// @copydoc COMPOSITOR::GetBuffer()
+    inline virtual unsigned int GetBuffer() const
+    {
+        if( m_currentFbo == DIRECT_RENDERING )
+            return DIRECT_RENDERING;
+
+        return m_current + 1;
+    }
+
+    /// @copydoc COMPOSITOR::ClearBuffer()
+    virtual void ClearBuffer();
+
+    /// @copydoc COMPOSITOR::DrawBuffer()
+    virtual void DrawBuffer( unsigned int aBufferHandle );
+
+    // Constant used by glBindFramebuffer to turn off rendering to framebuffers
+    static const unsigned int DIRECT_RENDERING = 0;
+
+protected:
+    typedef struct
+    {
+        GLuint textureTarget;                ///< Main texture handle
+        GLuint attachmentPoint;              ///< Point to which an image from texture is attached
+    } OPENGL_BUFFER;
+
+    bool            m_initialized;            ///< Initialization status flag
+    unsigned int    m_current;                ///< Currently used buffer handle
+    GLuint          m_framebuffer;            ///< Main FBO handle
+    GLuint          m_depthBuffer;            ///< Depth buffer handle
+    typedef std::deque<OPENGL_BUFFER> OPENGL_BUFFERS;
+
+    /// Stores information about initialized buffers
+    OPENGL_BUFFERS  m_buffers;
+
+    /// Store the currently used FBO name in case there was more than one compositor used
+    GLuint          m_currentFbo;
+
+    /**
+     * Function clean()
+     * performs freeing of resources.
+     */
+    void clean();
+
+    /// Returns number of used buffers
+    inline unsigned int usedBuffers()
+    {
+        return m_buffers.size();
+    }
+};
+} // namespace KIGFX
+
+#endif /* COMPOSITOR_H_ */