gpu_manager.h

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/*
 * 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
 */

#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();

    virtual void BeginDrawing() = 0;

    virtual void DrawIndices( unsigned int aOffset, unsigned int aSize ) = 0;

    virtual void DrawAll() = 0;

    virtual void EndDrawing() = 0;

    virtual void SetShader( SHADER& aShader );

    void EnableDepthTest( bool aEnabled );

protected:
    GPU_MANAGER( VERTEX_CONTAINER* aContainer );

    bool m_isDrawing;

    VERTEX_CONTAINER* m_container;

    SHADER* m_shader;

    int m_shaderAttrib;

    bool m_enableDepthTest;
};


class GPU_CACHED_MANAGER : public GPU_MANAGER
{
public:
    GPU_CACHED_MANAGER( VERTEX_CONTAINER* aContainer );
    ~GPU_CACHED_MANAGER();

    virtual void BeginDrawing() override;

    virtual void DrawIndices( unsigned int aOffset, unsigned int aSize ) override;

    virtual void DrawAll() override;

    virtual void EndDrawing() override;

    void Map();

    void Unmap();

protected:
    void resizeIndices( unsigned int aNewSize );

    bool m_buffersInitialized;

    boost::scoped_array<GLuint> m_indices;

    GLuint* m_indicesPtr;

    GLuint  m_indicesBuffer;

    unsigned int m_indicesSize;

    unsigned int m_indicesCapacity;
};


class GPU_NONCACHED_MANAGER : public GPU_MANAGER
{
public:
    GPU_NONCACHED_MANAGER( VERTEX_CONTAINER* aContainer );

    virtual void BeginDrawing() override;

    virtual void DrawIndices( unsigned int aOffset, unsigned int aSize ) override;

    virtual void DrawAll() override;

    virtual void EndDrawing() override;
};
} // namespace KIGFX
#endif /* GPU_MANAGER_H_ */