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Diffstat (limited to 'include/gal/opengl/gpu_manager.h')
-rw-r--r-- | include/gal/opengl/gpu_manager.h | 182 |
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_ */ |