Merge pull request #4 from FOSSEE/develop

merging dev into master

1 files changed, 182 insertions, 0 deletions

diff --git a/include/gal/opengl/gpu_manager.h b/include/gal/opengl/gpu_manager.h
new file mode 100644
index 0000000..5ed2a08
--- /dev/null
+++ b/include/gal/opengl/gpu_manager.h
@@ -0,0 +1,182 @@
+/*
+ * 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 gpu_manager.h
+ * @brief Class to handle uploading vertices and indices to GPU in drawing purposes.
+ */
+
+#ifndef GPU_MANAGER_H_
+#define GPU_MANAGER_H_
+
+#include <gal/opengl/vertex_common.h>
+#include <boost/scoped_array.hpp>
+
+namespace KIGFX
+{
+class SHADER;
+class VERTEX_CONTAINER;
+class CACHED_CONTAINER;
+class NONCACHED_CONTAINER;
+
+class GPU_MANAGER
+{
+public:
+    static GPU_MANAGER* MakeManager( VERTEX_CONTAINER* aContainer );
+
+    virtual ~GPU_MANAGER();
+
+    /**
+     * @brief Initializes everything needed to use vertex buffer objects (should be called when
+     * there is an OpenGL context available).
+     */
+    virtual void Initialize() = 0;
+
+    /**
+     * Function BeginDrawing()
+     * Prepares the stored data to be drawn.
+     */
+    virtual void BeginDrawing() = 0;
+
+    /**
+     * Function DrawIndices()
+     * Makes the GPU draw given range of vertices.
+     * @param aOffset is the beginning of the range.
+     * @param aSize is the number of vertices to be drawn.
+     */
+    virtual void DrawIndices( unsigned int aOffset, unsigned int aSize ) = 0;
+
+    /**
+     * Function DrawIndices()
+     * Makes the GPU draw all the vertices stored in the container.
+     */
+    virtual void DrawAll() = 0;
+
+    /**
+     * Function EndDrawing()
+     * Clears the container after drawing routines.
+     */
+    virtual void EndDrawing() = 0;
+
+    /**
+     * Function SetShader()
+     * Allows using shaders with the stored data.
+     * @param aShader is the object that allows using shaders.
+     */
+    virtual void SetShader( SHADER& aShader );
+
+protected:
+    GPU_MANAGER( VERTEX_CONTAINER* aContainer );
+
+    ///> Drawing status flag.
+    bool m_isDrawing;
+
+    ///> Container that stores vertices data.
+    VERTEX_CONTAINER* m_container;
+
+    ///> Shader handling
+    SHADER* m_shader;
+
+    ///> Location of shader attributes (for glVertexAttribPointer)
+    int m_shaderAttrib;
+};
+
+
+class GPU_CACHED_MANAGER : public GPU_MANAGER
+{
+public:
+    GPU_CACHED_MANAGER( VERTEX_CONTAINER* aContainer );
+    ~GPU_CACHED_MANAGER();
+
+    ///> @copydoc GPU_MANAGER::Initialize()
+    virtual void Initialize();
+
+    ///> @copydoc GPU_MANAGER::BeginDrawing()
+    virtual void BeginDrawing();
+
+    ///> @copydoc GPU_MANAGER::DrawIndices()
+    virtual void DrawIndices( unsigned int aOffset, unsigned int aSize );
+
+    ///> @copydoc GPU_MANAGER::DrawAll()
+    virtual void DrawAll();
+
+    ///> @copydoc GPU_MANAGER::EndDrawing()
+    virtual void EndDrawing();
+
+protected:
+    /**
+     * Function uploadToGpu
+     * Rebuilds vertex buffer object using stored VERTEX_ITEMs and sends it to the graphics card
+     * memory.
+     */
+    virtual void uploadToGpu();
+
+    ///> Resizes the indices buffer to aNewSize if necessary
+    void resizeIndices( unsigned int aNewSize );
+
+    ///> Buffers initialization flag
+    bool m_buffersInitialized;
+
+    ///> Pointer to the current indices buffer
+    boost::scoped_array<GLuint> m_indices;
+
+    ///> Pointer to the first free cell in the indices buffer
+    GLuint* m_indicesPtr;
+
+    ///> Handle to vertices buffer
+    GLuint  m_verticesBuffer;
+
+    ///> Handle to indices buffer
+    GLuint  m_indicesBuffer;
+
+    ///> Number of indices stored in the indices buffer
+    unsigned int m_indicesSize;
+
+    ///> Current indices buffer size
+    unsigned int m_indicesCapacity;
+};
+
+
+class GPU_NONCACHED_MANAGER : public GPU_MANAGER
+{
+public:
+    GPU_NONCACHED_MANAGER( VERTEX_CONTAINER* aContainer );
+
+    ///> @copydoc GPU_MANAGER::Initialize()
+    virtual void Initialize();
+
+    ///> @copydoc GPU_MANAGER::BeginDrawing()
+    virtual void BeginDrawing();
+
+    ///> @copydoc GPU_MANAGER::DrawIndices()
+    virtual void DrawIndices( unsigned int aOffset, unsigned int aSize );
+
+    ///> @copydoc GPU_MANAGER::DrawAll()
+    virtual void DrawAll();
+
+    ///> @copydoc GPU_MANAGER::EndDrawing()
+    virtual void EndDrawing();
+};
+} // namespace KIGFX
+#endif /* GPU_MANAGER_H_ */