abstract_drawable_mesh.h

/*****************************************************************************
 * VCLib                                                                     *
 * Visual Computing Library                                                  *
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 * Copyright(C) 2021-2025                                                    *
 * Visual Computing Lab                                                      *
 * ISTI - Italian National Research Council                                  *
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 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the              *
 * Mozilla Public License Version 2.0                                        *
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 ****************************************************************************/
 
#ifndef VCL_RENDER_DRAWABLE_ABSTRACT_DRAWABLE_MESH_H
#define VCL_RENDER_DRAWABLE_ABSTRACT_DRAWABLE_MESH_H
 
#include "drawable_object.h"
#include "mesh/mesh_render_settings.h"
 
#include <vclib/space/core/matrix.h>
 
namespace vcl {
 
class AbstractDrawableMesh : public vcl::DrawableObject
{
    inline static const Image EMPTY_IMAGE;
 
protected:
    MeshRenderSettings mMRS;
 
    Box3d mBoundingBox;
 
public:
    using MatIt = std::vector<Material>::const_iterator;
 
    AbstractDrawableMesh() = default;
 
    AbstractDrawableMesh(const AbstractDrawableMesh& other) = default;
 
    template<MeshConcept MeshType>
    AbstractDrawableMesh(const MeshType& m) : mMRS(m)
    {
    }
 
    const MeshRenderSettings& renderSettings() const { return mMRS; }
 
    virtual void updateBuffers(
        MeshRenderInfo::BuffersBitSet buffersToUpdate =
            MeshRenderInfo::BUFFERS_ALL) = 0;
 
    virtual void setRenderSettings(const MeshRenderSettings& rs) { mMRS = rs; }
 
    virtual uint vertexNumber() const = 0;
 
    virtual uint faceNumber() const = 0;
 
    virtual uint edgeNumber() const = 0;
 
    virtual vcl::Matrix44d transformMatrix() const = 0;
 
    virtual View<MatIt> materials() const { return View<MatIt>(); }
 
    virtual const Image& textureImage(const std::string& path) const
    {
        return EMPTY_IMAGE;
    }
 
    // DrawableObject implementation
 
    Box3d boundingBox() const override { return mBoundingBox; }
 
    inline bool isVisible() const override { return mMRS.isVisible(); }
 
    inline void setVisibility(bool vis) override { mMRS.setVisibility(vis); }
 
protected:
    void swap(AbstractDrawableMesh& other)
    {
        using std::swap;
        vcl::DrawableObject::swap(other);
        swap(mMRS, other.mMRS);
        swap(mBoundingBox, other.mBoundingBox);
    }
 
    // if the mesh does not have a bounding box, or if it has it but it is
    // null, compute it from the vertex positions. If the mesh has a
    // transformation matrix, apply it to the bounding box.
    // The DrawableMesh must return the *transformed* bounding box.
    template<MeshConcept MeshType>
    void computeBoundingBox(const MeshType& m)
    {
        bool bbToInitialize = !vcl::HasBoundingBox<MeshType>;
        if constexpr (vcl::HasBoundingBox<MeshType>) {
            if (m.boundingBox().isNull()) {
                bbToInitialize = true;
            }
            else {
                mBoundingBox =
                    m.MeshType::boundingBox().template cast<double>();
            }
        }
 
        if (bbToInitialize) {
            mBoundingBox = vcl::boundingBox(m);
        }
 
        if constexpr (HasTransformMatrix<MeshType>) {
            mBoundingBox = transformBox(mBoundingBox, m.transformMatrix());
        }
    }
};
 
} // namespace vcl
 
#endif // VCL_RENDER_DRAWABLE_ABSTRACT_DRAWABLE_MESH_H