summaryrefslogtreecommitdiff
path: root/include/gal/opengl/gpu_manager.h
diff options
context:
space:
mode:
Diffstat (limited to 'include/gal/opengl/gpu_manager.h')
-rw-r--r--include/gal/opengl/gpu_manager.h182
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_ */