StelQGLInterleavedArrayVertexBufferBackend.hpp

/*
 * Stellarium
 * Copyright (C) 2012 Ferdinand Majerech
 *
 * 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, write to the Free Software
 * Foundation, Inc., 51 Franklin Street, Suite 500, Boston, MA  02110-1335, USA.
 */

#ifndef _STELQGLINTERLEAVEDARRAYVERTEXBUFFERBACKEND_HPP_
#define _STELQGLINTERLEAVEDARRAYVERTEXBUFFERBACKEND_HPP_

#include <cstring>

#include "VecMath.hpp"
#include "StelProjectorType.hpp"
#include "StelVertexBuffer.hpp"
#include "StelVertexBufferBackend.hpp"
#include "StelVertexAttribute.hpp"


class StelQGLInterleavedArrayVertexBufferBackend : public StelVertexBufferBackend
{
private:
    static const int VERTEX_ALIGN = 16;
public:
    virtual ~StelQGLInterleavedArrayVertexBufferBackend();

    virtual void addVertex(const void* const vertexInPtr);

    virtual void getVertex(const int index, void* const vertexOutPtr) const;

    virtual void setVertex(const int index, const void* const vertexInPtr)
    {
        std::memcpy(vertices + index * vertexStride, vertexInPtr, vertexBytes);
    }

    virtual void lock()
    {
        locked = true;
    }

    virtual void unlock()
    {
        locked = false;
    }

    virtual void clear()
    {
        vertexCount = 0;
    }

    void projectVertices(StelProjector* projector, 
                         class StelQGLIndexBuffer* indexBuffer);

    int length() const
    {
        return vertexCount;
    }

    PrimitiveType getPrimitiveType() const
    {
        return primitiveType;
    }

protected:
    bool locked;

    PrimitiveType primitiveType;

    int vertexCount;

    int vertexCapacity;

    int vertexBytes;

    int vertexStride;

    char* vertices;

    bool usingProjectedPositions;

    Vec3f* projectedPositions;

    int projectedPositionsCapacity;

    StelQGLInterleavedArrayVertexBufferBackend(const PrimitiveType type,
                                               const QVector<StelVertexAttribute>& attributes);
};

#endif // _STELQGLINTERLEAVEDARRAYVERTEXBUFFERBACKEND_HPP_