gls_index_array.h

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/*! \file
  \brief The disti::GlsIndexArray class, for managing index buffers.

  \par Copyright Information

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*/

#ifndef GLS_INDEX_ARRAY_H
#define GLS_INDEX_ARRAY_H

#include "gls_include.h"
#include "gls_state_manager.h"
#include "non_copyable.h"

namespace disti
{
class GlsIndexArray : public NonCopyable
{
public:
    /** Default constructor
     */
    GlsIndexArray();

    /** Destructor
     */
    virtual ~GlsIndexArray();

    /** Sets the size of the index buffer
     * \param size New index buffer count
     */
    void SetSize( const unsigned int size );

    /** \return Returns the size of the index buffer */
    unsigned int GetSize() const
    {
        return _size;
    }

    /** Populates the the index buffer
     * \pre _size > 0
     * \param indexData The indices to set.  The array length is assumed to be equal to GetSize()
     */
    void SetIndices( const unsigned short indexData[] );

    /** Sets one index
     * \pre index < _size
     * \param index The index of the index to set
     * \param val The index data
     */
    void SetIndex( const unsigned int index, const unsigned short value );

    /** Download the index buffer data to Open GL 
     * \pre (_vboHandle != 0) && (_size > 0) 
     * \param stateManager The OpenGL state to download the index buffer to
     */
    void Bake( IGlsStateManager* stateManager );

    /** Bind the index buffer, e.g. make it current
     * \pre (_vboHandle != 0) && (_size > 0)
     * \param stateManager The OpenGL state to bind the buffer on
     */
    void Bind( IGlsStateManager* stateManager );

protected:
    unsigned short* _indexData; /**< The memory for storing the indices */
    unsigned int    _vboHandle; /**< The OpenGL VBO handle */
    unsigned int    _size;      /**< The number of indices. There can be unsigned int quantity of unsigned short values*/

    /** Allocates the buffer data, copying the existing data
     * \param size The new size in bytes to allocate
     */
    void AllocateBuffer( const unsigned int size );

    /** Deallocates the buffer data
     */
    void DeallocateBuffer();
};

} // namespace disti

#endif