CRenderizableShaderTriangles.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 <mrpt/opengl/COpenGLBuffer.h>
#include <mrpt/opengl/COpenGLVertexArrayObject.h>
#include <mrpt/opengl/CRenderizable.h>
#include <mrpt/opengl/TTriangle.h>

namespace mrpt::opengl
{
/** Renderizable generic renderer for objects using the triangles shader.
 *
 *  \sa opengl::COpenGLScene
 *
 * \ingroup mrpt_opengl_grp
 */
class CRenderizableShaderTriangles : public virtual CRenderizable
{
    DEFINE_VIRTUAL_SERIALIZABLE(CRenderizableShaderTriangles)

   public:
    CRenderizableShaderTriangles() = default;
    virtual ~CRenderizableShaderTriangles() override;

    virtual shader_list_t requiredShaders() const override
    {
        return {DefaultShaderID::TRIANGLES};
    }
    void render(const RenderContext& rc) const override;
    void renderUpdateBuffers() const override;

    /** Must be implemented in derived classes to update the geometric entities
     * to be drawn in "m_*_buffer" fields. */
    virtual void onUpdateBuffers_Triangles() = 0;

    // See base docs
    void freeOpenGLResources() override
    {
        m_trianglesBuffer.destroy();
        m_vao.destroy();
    }

    /** @name Raw access to triangle shader buffer data
     * @{ */
    const auto& shaderTexturedTrianglesBuffer() const { return m_triangles; }
    /** @} */

   protected:
    /** List of triangles  \sa TTriangle */
    mutable std::vector<mrpt::opengl::TTriangle> m_triangles;

   private:
    mutable COpenGLBuffer m_trianglesBuffer;
    mutable COpenGLVertexArrayObject m_vao;
};

}  // namespace mrpt::opengl