COpenGLVertexArrayObject.h

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/* +------------------------------------------------------------------------+
   |                     Mobile Robot Programming Toolkit (MRPT)            |
   |                          https://www.mrpt.org/                         |
   |                                                                        |
   | Copyright (c) 2005-2020, Individual contributors, see AUTHORS file     |
   | See: https://www.mrpt.org/Authors - All rights reserved.               |
   | Released under BSD License. See: https://www.mrpt.org/License          |
   +------------------------------------------------------------------------+ */
#pragma once

#include <memory>
#include <thread>

namespace mrpt::opengl
{
/** A wrapper for an OpenGL vertex array object (VAO).
 * Refer to docs for glGenVertexArrays().
 *
 * \ingroup mrpt_opengl_grp
 */
class COpenGLVertexArrayObject
{
   public:
    COpenGLVertexArrayObject();
    ~COpenGLVertexArrayObject() = default;

    /** Actually create the buffer, destroying any previously existing buffer.
     */
    void create() { m_impl->create(); }

    /** Calls create() only if the buffer has not been created yet. */
    void createOnce()
    {
        if (!isCreated()) create();
    }
    bool isCreated() const { return m_impl->created; }

    /** Automatically called upon destructor, no need for the user to call it in
     * normal situations. */
    void destroy() { m_impl->destroy(); }

    void bind() { m_impl->bind(); }
    void release() { m_impl->bind(); }

    unsigned int bufferId() const { return m_impl->buffer_id; }

   private:
    struct RAII_Impl
    {
        RAII_Impl() = default;
        ~RAII_Impl();

        void create();
        void destroy();
        void bind();
        void release();
        void allocate(const void* data, int byteCount);

        bool created = false;
        unsigned int buffer_id = 0;
        std::thread::id created_from;
    };
    std::shared_ptr<RAII_Impl> m_impl;
};

}  // namespace mrpt::opengl