MeshViewer.h

//=============================================================================
// Copyright (C) 2011-2019 The pmp-library developers
//
// This file is part of the Polygon Mesh Processing Library.
// Distributed under a MIT-style license, see LICENSE.txt for details.
//
// SPDX-License-Identifier: MIT-with-employer-disclaimer
//=============================================================================
#pragma once
//=============================================================================

#include <pmp/visualization/SurfaceMeshGL.h>
#include <pmp/visualization/TrackballViewer.h>

//=============================================================================

namespace pmp {

//=============================================================================

//! \addtogroup visualization visualization
//! @{

//=============================================================================

//! Simple viewer for a SurfaceMesh
class MeshViewer : public TrackballViewer
{
public:
    //! constructor
    MeshViewer(const char* title, int width, int height, bool showgui = true);

    //! destructor
    virtual ~MeshViewer();

    //! load a mesh from file \c filename
    virtual bool load_mesh(const char* filename);

    //! load a matcap texture from file \c filename
    bool load_matcap(const char* filename);

    //! load a texture from file \c filename
    bool load_texture(const char* filename, GLint format = GL_RGB,
                      GLint min_filter = GL_LINEAR_MIPMAP_LINEAR,
                      GLint mag_filter = GL_LINEAR,
                      GLint wrap = GL_CLAMP_TO_EDGE);

    //! update mesh normals and all buffers for OpenGL rendering.  call this
    //! function whenever you change either the vertex positions or the
    //! triangulation of the mesh
    virtual void update_mesh();

    //! draw the scene in different draw modes
    virtual void draw(const std::string& draw_mode) override;

    //! handle ImGUI interface
    virtual void process_imgui() override;

    //! this function handles keyboard events
    virtual void keyboard(int key, int code, int action, int mod) override;

    //! get vertex closest to 3D position Distributed under the mouse cursor
    Vertex pick_vertex(int x, int y);

protected:
    SurfaceMeshGL mesh_;   //!< the mesh
    std::string filename_; //!< the current file
    float crease_angle_;
};

//=============================================================================
//! @}
//=============================================================================
} // namespace pmp
//=============================================================================