#ifndef slic3r_GLCanvas3D_hpp_
#define slic3r_GLCanvas3D_hpp_

#include <stddef.h>

#include "3DScene.hpp"
#include "GLToolbar.hpp"
#include "Event.hpp"

#include <wx/timer.h>

class wxWindow;
class wxSizeEvent;
class wxIdleEvent;
class wxKeyEvent;
class wxMouseEvent;
class wxTimerEvent;
class wxPaintEvent;


namespace Slic3r {

class GLShader;
class ExPolygon;
class SLAPrint;

namespace GUI {

class GLGizmoBase;

class GeometryBuffer
{
    std::vector<float> m_vertices;
    std::vector<float> m_tex_coords;

public:
    bool set_from_triangles(const Polygons& triangles, float z, bool generate_tex_coords);
    bool set_from_lines(const Lines& lines, float z);

    const float* get_vertices() const;
    const float* get_tex_coords() const;

    unsigned int get_vertices_count() const;
};

class Size
{
    int m_width;
    int m_height;

public:
    Size();
    Size(int width, int height);

    int get_width() const;
    void set_width(int width);

    int get_height() const;
    void set_height(int height);
};

class Rect
{
    float m_left;
    float m_top;
    float m_right;
    float m_bottom;

public:
    Rect();
    Rect(float left, float top, float right, float bottom);

    float get_left() const;
    void set_left(float left);

    float get_top() const;
    void set_top(float top);

    float get_right() const;
    void set_right(float right);

    float get_bottom() const;
    void set_bottom(float bottom);
};

wxDECLARE_EVENT(EVT_GLCANVAS_OBJECT_SELECT, SimpleEvent);

using Vec2dEvent = Event<Vec2d>;
template <size_t N> using Vec2dsEvent = ArrayEvent<Vec2d, N>;

using Vec3dEvent = Event<Vec3d>;
template <size_t N> using Vec3dsEvent = ArrayEvent<Vec3d, N>;

wxDECLARE_EVENT(EVT_GLCANVAS_SCHEDULE_BACKGROUND_PROCESS, SimpleEvent);
wxDECLARE_EVENT(EVT_GLCANVAS_VIEWPORT_CHANGED, SimpleEvent);
wxDECLARE_EVENT(EVT_GLCANVAS_RIGHT_CLICK, Vec2dEvent);
wxDECLARE_EVENT(EVT_GLCANVAS_MODEL_UPDATE, SimpleEvent);
wxDECLARE_EVENT(EVT_GLCANVAS_REMOVE_OBJECT, SimpleEvent);
wxDECLARE_EVENT(EVT_GLCANVAS_ARRANGE, SimpleEvent);
wxDECLARE_EVENT(EVT_GLCANVAS_INCREASE_INSTANCES, Event<int>); // data: +1 => increase, -1 => decrease
wxDECLARE_EVENT(EVT_GLCANVAS_INSTANCE_MOVED, SimpleEvent);
wxDECLARE_EVENT(EVT_GLCANVAS_WIPETOWER_MOVED, Vec3dEvent);
wxDECLARE_EVENT(EVT_GLCANVAS_ENABLE_ACTION_BUTTONS, Event<bool>);
wxDECLARE_EVENT(EVT_GLCANVAS_UPDATE_GEOMETRY, Vec3dsEvent<2>);

class GLCanvas3D
{
    struct GCodePreviewVolumeIndex
    {
        enum EType
        {
            Extrusion,
            Travel,
            Retraction,
            Unretraction,
            Shell,
            Num_Geometry_Types
        };

        struct FirstVolume
        {
            EType type;
            unsigned int flag;
            // Index of the first volume in a GLVolumeCollection.
            unsigned int id;

            FirstVolume(EType type, unsigned int flag, unsigned int id) : type(type), flag(flag), id(id) {}
        };

        std::vector<FirstVolume> first_volumes;

        void reset() { first_volumes.clear(); }
    };

    struct Camera
    {
        enum EType : unsigned char
        {
            Unknown,
//            Perspective,
            Ortho,
            Num_types
        };

        EType type;
        float zoom;
        float phi;
//        float distance;
        Vec3d target;

    private:
        float m_theta;

    public:
        Camera();

        std::string get_type_as_string() const;

        float get_theta() const;
        void set_theta(float theta);
    };

    class Bed
    {
    public:
        enum EType : unsigned char
        {
            MK2,
            MK3,
            Custom,
            Num_Types
        };

    private:
        EType m_type;
        Pointfs m_shape;
        BoundingBoxf3 m_bounding_box;
        Polygon m_polygon;
        GeometryBuffer m_triangles;
        GeometryBuffer m_gridlines;
        mutable GLTexture m_top_texture;
        mutable GLTexture m_bottom_texture;

    public:
        Bed();

        bool is_prusa() const;
        bool is_custom() const;

        const Pointfs& get_shape() const;
        // Return true if the bed shape changed, so the calee will update the UI.
        bool set_shape(const Pointfs& shape);

        const BoundingBoxf3& get_bounding_box() const;
        bool contains(const Point& point) const;
        Point point_projection(const Point& point) const;

        void render(float theta) const;

    private:
        void _calc_bounding_box();
        void _calc_triangles(const ExPolygon& poly);
        void _calc_gridlines(const ExPolygon& poly, const BoundingBox& bed_bbox);
        EType _detect_type() const;
        void _render_mk2(float theta) const;
        void _render_mk3(float theta) const;
        void _render_prusa(float theta) const;
        void _render_custom() const;
        static bool _are_equal(const Pointfs& bed_1, const Pointfs& bed_2);
    };

    struct Axes
    {
        Vec3d origin;
        float length;

        Axes();

        void render(bool depth_test) const;
    };

    class CuttingPlane
    {
        float m_z;
        GeometryBuffer m_lines;

    public:
        CuttingPlane();

        bool set(float z, const ExPolygons& polygons);

        void render(const BoundingBoxf3& bb) const;

    private:
        void _render_plane(const BoundingBoxf3& bb) const;
        void _render_contour() const;
    };

    class Shader
    {
        GLShader* m_shader;

    public:
        Shader();
        ~Shader();

        bool init(const std::string& vertex_shader_filename, const std::string& fragment_shader_filename);

        bool is_initialized() const;

        bool start_using() const;
        void stop_using() const;

        void set_uniform(const std::string& name, float value) const;
        void set_uniform(const std::string& name, const float* matrix) const;

        const GLShader* get_shader() const;

    private:
        void _reset();
    };

    class LayersEditing
    {
    public:
        enum EState : unsigned char
        {
            Unknown,
            Editing,
            Completed,
            Num_States
        };

    private:
        bool m_use_legacy_opengl;
        bool m_enabled;
        Shader m_shader;
        unsigned int m_z_texture_id;
        mutable GLTexture m_tooltip_texture;
        mutable GLTexture m_reset_texture;

    public:
        EState state;
        float band_width;
        float strength;
        int last_object_id;
        float last_z;
        unsigned int last_action;

        LayersEditing();
        ~LayersEditing();

        bool init(const std::string& vertex_shader_filename, const std::string& fragment_shader_filename);

        bool is_allowed() const;
        void set_use_legacy_opengl(bool use_legacy_opengl);

        bool is_enabled() const;
        void set_enabled(bool enabled);

        unsigned int get_z_texture_id() const;

        void render(const GLCanvas3D& canvas, const PrintObject& print_object, const GLVolume& volume) const;

        int get_shader_program_id() const;

        static float get_cursor_z_relative(const GLCanvas3D& canvas);
        static bool bar_rect_contains(const GLCanvas3D& canvas, float x, float y);
        static bool reset_rect_contains(const GLCanvas3D& canvas, float x, float y);
        static Rect get_bar_rect_screen(const GLCanvas3D& canvas);
        static Rect get_reset_rect_screen(const GLCanvas3D& canvas);
        static Rect get_bar_rect_viewport(const GLCanvas3D& canvas);
        static Rect get_reset_rect_viewport(const GLCanvas3D& canvas);

    private:
        bool _is_initialized() const;
        void _render_tooltip_texture(const GLCanvas3D& canvas, const Rect& bar_rect, const Rect& reset_rect) const;
        void _render_reset_texture(const Rect& reset_rect) const;
        void _render_active_object_annotations(const GLCanvas3D& canvas, const GLVolume& volume, const PrintObject& print_object, const Rect& bar_rect) const;
        void _render_profile(const PrintObject& print_object, const Rect& bar_rect) const;
    };

    struct Mouse
    {
        struct Drag
        {
            static const Point Invalid_2D_Point;
            static const Vec3d Invalid_3D_Point;

            Point start_position_2D;
            Vec3d start_position_3D;
            int move_volume_idx;

        public:
            Drag();
        };

        bool dragging;
        Vec2d position;
        Drag drag;
#if ENABLE_GIZMOS_RESET
        bool ignore_up_event;
#endif // ENABLE_GIZMOS_RESET

        Mouse();

        void set_start_position_2D_as_invalid();
        void set_start_position_3D_as_invalid();

        bool is_start_position_2D_defined() const;
        bool is_start_position_3D_defined() const;
    };

public:
    class Selection
    {
    public:
        typedef std::set<unsigned int> IndicesList;

        enum EMode : unsigned char
        {
#if ENABLE_MODELVOLUME_TRANSFORM
            Volume,
            Instance
#else
            Volume,
            Instance,
            Object
#endif // ENABLE_MODELVOLUME_TRANSFORM
        };

        enum EType : unsigned char
        {
            Invalid,
            Empty,
            WipeTower,
            SingleModifier,
            MultipleModifier,
            SingleVolume,
            MultipleVolume,
            SingleFullObject,
            MultipleFullObject,
            SingleFullInstance,
            MultipleFullInstance,
            Mixed
        };

    private:
        struct VolumeCache
        {
        private:
#if ENABLE_MODELVOLUME_TRANSFORM
            struct TransformCache
            {
                Vec3d position;
                Vec3d rotation;
                Vec3d scaling_factor;
                Transform3d rotation_matrix;
                Transform3d scale_matrix;

                TransformCache();
                explicit TransformCache(const Geometry::Transformation& transform);
            };

            TransformCache m_volume;
            TransformCache m_instance;
#else
            Vec3d m_position;
            Vec3d m_rotation;
            Vec3d m_scaling_factor;
            Transform3d m_rotation_matrix;
            Transform3d m_scale_matrix;
#endif // ENABLE_MODELVOLUME_TRANSFORM

        public:
#if ENABLE_MODELVOLUME_TRANSFORM
            VolumeCache() {}
            VolumeCache(const Geometry::Transformation& volume_transform, const Geometry::Transformation& instance_transform);
#else
            VolumeCache();
            VolumeCache(const Vec3d& position, const Vec3d& rotation, const Vec3d& scaling_factor);
#endif // ENABLE_MODELVOLUME_TRANSFORM

#if ENABLE_MODELVOLUME_TRANSFORM
            const Vec3d& get_volume_position() const { return m_volume.position; }
            const Vec3d& get_volume_rotation() const { return m_volume.rotation; }
            const Vec3d& get_volume_scaling_factor() const { return m_volume.scaling_factor; }
            const Transform3d& get_volume_rotation_matrix() const { return m_volume.rotation_matrix; }
            const Transform3d& get_volume_scale_matrix() const { return m_volume.scale_matrix; }

            const Vec3d& get_instance_position() const { return m_instance.position; }
            const Vec3d& get_instance_rotation() const { return m_instance.rotation; }
            const Vec3d& get_instance_scaling_factor() const { return m_instance.scaling_factor; }
            const Transform3d& get_instance_rotation_matrix() const { return m_instance.rotation_matrix; }
            const Transform3d& get_instance_scale_matrix() const { return m_instance.scale_matrix; }
#else
            const Vec3d& get_position() const { return m_position; }
            const Vec3d& get_rotation() const { return m_rotation; }
            const Vec3d& get_scaling_factor() const { return m_scaling_factor; }
            const Transform3d& get_rotation_matrix() const { return m_rotation_matrix; }
            const Transform3d& get_scale_matrix() const { return m_scale_matrix; }
#endif // ENABLE_MODELVOLUME_TRANSFORM
        };

        typedef std::map<unsigned int, VolumeCache> VolumesCache;
        typedef std::set<int> InstanceIdxsList;
        typedef std::map<int, InstanceIdxsList> ObjectIdxsToInstanceIdxsMap;

        struct Cache
        {
            // Cache of GLVolume derived transformation matrices, valid during mouse dragging.
            VolumesCache volumes_data;
            // Center of the dragged selection, valid during mouse dragging.
            Vec3d dragging_center;
            // Map from indices of ModelObject instances in Model::objects
            // to a set of indices of ModelVolume instances in ModelObject::instances
            // Here the index means a position inside the respective std::vector, not ModelID.
            ObjectIdxsToInstanceIdxsMap content;
        };

        // Volumes owned by GLCanvas3D.
        GLVolumePtrs* m_volumes;
        // Model, not owned.
        Model* m_model;

        bool m_valid;
        EMode m_mode;
        EType m_type;
        // set of indices to m_volumes
        IndicesList m_list;
        Cache m_cache;
        mutable BoundingBoxf3 m_bounding_box;
        mutable bool m_bounding_box_dirty;

    public:
        Selection();

        void set_volumes(GLVolumePtrs* volumes);
        void set_model(Model* model);

        EMode get_mode() const { return m_mode; }
        void set_mode(EMode mode) { m_mode = mode; }

        void add(unsigned int volume_idx, bool as_single_selection = true);
        void remove(unsigned int volume_idx);

        void add_object(unsigned int object_idx, bool as_single_selection = true);
        void remove_object(unsigned int object_idx);

        void add_instance(unsigned int object_idx, unsigned int instance_idx, bool as_single_selection = true);
        void remove_instance(unsigned int object_idx, unsigned int instance_idx);

        void add_volume(unsigned int object_idx, unsigned int volume_idx, int instance_idx, bool as_single_selection = true);
        void remove_volume(unsigned int object_idx, unsigned int volume_idx);

        void clear();

        bool is_empty() const { return m_type == Empty; }
        bool is_wipe_tower() const { return m_type == WipeTower; }
        bool is_modifier() const { return (m_type == SingleModifier) || (m_type == MultipleModifier); }
        bool is_single_modifier() const { return m_type == SingleModifier; }
        bool is_single_full_instance() const;
        bool is_multiple_full_instance() const { return m_type == MultipleFullInstance; }
        bool is_single_full_object() const { return m_type == SingleFullObject; }
        bool is_multiple_full_object() const { return m_type == MultipleFullObject; }
        bool is_single_volume() const { return m_type == SingleVolume; }
        bool is_multiple_volume() const { return m_type == MultipleVolume; }
        bool is_mixed() const { return m_type == Mixed; }
        bool is_from_single_instance() const { return get_instance_idx() != -1; }
        bool is_from_single_object() const { return get_object_idx() != -1; }

        bool contains_volume(unsigned int volume_idx) const { return std::find(m_list.begin(), m_list.end(), volume_idx) != m_list.end(); }

        // Returns the the object id if the selection is from a single object, otherwise is -1
        int get_object_idx() const;
        // Returns the instance id if the selection is from a single object and from a single instance, otherwise is -1
        int get_instance_idx() const;
        // Returns the indices of selected instances.
        // Can only be called if selection is from a single object.
        const InstanceIdxsList& get_instance_idxs() const;

        const IndicesList& get_volume_idxs() const { return m_list; }
        const GLVolume* get_volume(unsigned int volume_idx) const;

        unsigned int volumes_count() const { return (unsigned int)m_list.size(); }
        const BoundingBoxf3& get_bounding_box() const;

        void start_dragging();

        void translate(const Vec3d& displacement);
        void rotate(const Vec3d& rotation);
        void flattening_rotate(const Vec3d& normal);
        void scale(const Vec3d& scale);
        void mirror(Axis axis);

        void translate(unsigned int object_idx, const Vec3d& displacement);
        void translate(unsigned int object_idx, unsigned int instance_idx, const Vec3d& displacement);

        void erase();

        void render() const;

    private:
        void _update_valid();
        void _update_type();
        void _set_caches();
        void _add_volume(unsigned int volume_idx);
        void _add_instance(unsigned int object_idx, unsigned int instance_idx);
        void _add_object(unsigned int object_idx);
        void _remove_volume(unsigned int volume_idx);
        void _remove_instance(unsigned int object_idx, unsigned int instance_idx);
        void _remove_object(unsigned int object_idx);
        void _calc_bounding_box() const;
        void _render_selected_volumes() const;
        void _render_synchronized_volumes() const;
        void _render_bounding_box(const BoundingBoxf3& box, float* color) const;
        void _synchronize_unselected_instances();
        void _synchronize_unselected_volumes();
    };

private:
    class Gizmos
    {
        static const float OverlayTexturesScale;
        static const float OverlayOffsetX;
        static const float OverlayGapY;

    public:
        enum EType : unsigned char
        {
            Undefined,
            Move,
            Scale,
            Rotate,
            Flatten,
            SlaSupports,
            Num_Types
        };

    private:
        bool m_enabled;
        typedef std::map<EType, GLGizmoBase*> GizmosMap;
        GizmosMap m_gizmos;
        EType m_current;

    public:
        Gizmos();
        ~Gizmos();

        bool init(GLCanvas3D& parent);

        bool is_enabled() const;
        void set_enabled(bool enable);

        std::string update_hover_state(const GLCanvas3D& canvas, const Vec2d& mouse_pos, const Selection& selection);
        void update_on_off_state(const GLCanvas3D& canvas, const Vec2d& mouse_pos, const Selection& selection);
        void update_on_off_state(const Selection& selection);
        void reset_all_states();

        void set_hover_id(int id);
        void enable_grabber(EType type, unsigned int id, bool enable);

        bool overlay_contains_mouse(const GLCanvas3D& canvas, const Vec2d& mouse_pos) const;
        bool grabber_contains_mouse() const;
        void update(const Linef3& mouse_ray, const Point* mouse_pos = nullptr);
#if ENABLE_GIZMOS_RESET
        void process_double_click();
#endif // ENABLE_GIZMOS_RESET
        Rect get_reset_rect_viewport(const GLCanvas3D& canvas) const;
        EType get_current_type() const;

        bool is_running() const;

        bool is_dragging() const;
        void start_dragging(const Selection& selection);
        void stop_dragging();

        Vec3d get_displacement() const;

        Vec3d get_scale() const;
        void set_scale(const Vec3d& scale);

        Vec3d get_rotation() const;
        void set_rotation(const Vec3d& rotation);

        Vec3d get_flattening_normal() const;

        void set_flattening_data(const ModelObject* model_object);
        
        void set_model_object_ptr(ModelObject* model_object);
        void clicked_on_object(const Vec2d& mouse_position);
        void delete_current_grabber(bool delete_all = false);

        void render_current_gizmo(const Selection& selection) const;
        void render_current_gizmo_for_picking_pass(const Selection& selection) const;

        void render_overlay(const GLCanvas3D& canvas) const;

    private:
        void _reset();

        void _render_overlay(const GLCanvas3D& canvas) const;
        void _render_current_gizmo(const Selection& selection) const;

        float _get_total_overlay_height() const;
        GLGizmoBase* _get_current() const;
    };

    class WarningTexture : public GUI::GLTexture
    {
        static const unsigned char Background_Color[3];
        static const unsigned char Opacity;

        int m_original_width;
        int m_original_height;

    public:
        WarningTexture();

        bool generate(const std::string& msg);

        void render(const GLCanvas3D& canvas) const;
    };

    class LegendTexture : public GUI::GLTexture
    {
        static const int Px_Title_Offset = 5;
        static const int Px_Text_Offset = 5;
        static const int Px_Square = 20;
        static const int Px_Square_Contour = 1;
        static const int Px_Border = Px_Square / 2;
        static const unsigned char Squares_Border_Color[3];
        static const unsigned char Background_Color[3];
        static const unsigned char Opacity;

        int m_original_width;
        int m_original_height;

    public:
        LegendTexture();

        bool generate(const GCodePreviewData& preview_data, const std::vector<float>& tool_colors);

        void render(const GLCanvas3D& canvas) const;
    };

    wxGLCanvas* m_canvas;
    wxGLContext* m_context;
    LegendTexture m_legend_texture;
    WarningTexture m_warning_texture;
    wxTimer m_timer;
    Camera m_camera;
    Bed m_bed;
    Axes m_axes;
    CuttingPlane m_cutting_plane;
    LayersEditing m_layers_editing;
    Shader m_shader;
    Mouse m_mouse;
    mutable Gizmos m_gizmos;
    mutable GLToolbar m_toolbar;

    mutable GLVolumeCollection m_volumes;
    Selection m_selection;
    DynamicPrintConfig* m_config;
    Print* m_print;
    SLAPrint* m_sla_print;
    Model* m_model;

    bool m_dirty;
    bool m_initialized;
    bool m_use_VBOs;
    bool m_force_zoom_to_bed_enabled;
    bool m_apply_zoom_to_volumes_filter;
    mutable int m_hover_volume_id;
    bool m_toolbar_action_running;
    bool m_warning_texture_enabled;
    bool m_legend_texture_enabled;
    bool m_picking_enabled;
    bool m_moving_enabled;
    bool m_shader_enabled;
    bool m_dynamic_background_enabled;
    bool m_multisample_allowed;
    bool m_regenerate_volumes;

    std::string m_color_by;

    bool m_reload_delayed;

    GCodePreviewVolumeIndex m_gcode_preview_volume_index;

    void post_event(wxEvent &&event);
    void viewport_changed();

public:
    GLCanvas3D(wxGLCanvas* canvas);
    ~GLCanvas3D();

#if ENABLE_USE_UNIQUE_GLCONTEXT
    void set_context(wxGLContext* context) { m_context = context; }
#endif // ENABLE_USE_UNIQUE_GLCONTEXT

    wxGLCanvas* get_wxglcanvas() { return m_canvas; }

    bool init(bool useVBOs, bool use_legacy_opengl);

#if !ENABLE_USE_UNIQUE_GLCONTEXT
    bool set_current();
#endif // !ENABLE_USE_UNIQUE_GLCONTEXT

    void set_as_dirty();

    unsigned int get_volumes_count() const;
    void reset_volumes();
    int check_volumes_outside_state(const DynamicPrintConfig* config) const;
    bool move_volume_up(unsigned int id);
    bool move_volume_down(unsigned int id);

    void set_config(DynamicPrintConfig* config);
    void set_print(Print* print);
    void set_SLA_print(SLAPrint* print);
    void set_model(Model* model);

    const Selection& get_selection() const { return m_selection; }
    Selection& get_selection() { return m_selection; }

    // Set the bed shape to a single closed 2D polygon(array of two element arrays),
    // triangulate the bed and store the triangles into m_bed.m_triangles,
    // fills the m_bed.m_grid_lines and sets m_bed.m_origin.
    // Sets m_bed.m_polygon to limit the object placement.
    void set_bed_shape(const Pointfs& shape);
    // Used by ObjectCutDialog and ObjectPartsPanel to generate a rectangular ground plane to support the scene objects.
    void set_auto_bed_shape();

    void set_axes_length(float length);

    void set_cutting_plane(float z, const ExPolygons& polygons);

    void set_color_by(const std::string& value);

    float get_camera_zoom() const;

    BoundingBoxf3 volumes_bounding_box() const;

    bool is_layers_editing_enabled() const;
    bool is_layers_editing_allowed() const;
    bool is_shader_enabled() const;

    bool is_reload_delayed() const;

    void enable_layers_editing(bool enable);
    void enable_warning_texture(bool enable);
    void enable_legend_texture(bool enable);
    void enable_picking(bool enable);
    void enable_moving(bool enable);
    void enable_gizmos(bool enable);
    void enable_toolbar(bool enable);
    void enable_shader(bool enable);
    void enable_force_zoom_to_bed(bool enable);
    void enable_dynamic_background(bool enable);
    void allow_multisample(bool allow);

    void enable_toolbar_item(const std::string& name, bool enable);
    bool is_toolbar_item_pressed(const std::string& name) const;

    void zoom_to_bed();
    void zoom_to_volumes();
#if ENABLE_MODIFIED_CAMERA_TARGET
    void zoom_to_selection();
#endif // ENABLE_MODIFIED_CAMERA_TARGET
    void select_view(const std::string& direction);
    void set_viewport_from_scene(const GLCanvas3D& other);

    void update_volumes_colors_by_extruder();

    Rect get_gizmo_reset_rect(const GLCanvas3D& canvas, bool viewport) const;
    bool gizmo_reset_rect_contains(const GLCanvas3D& canvas, float x, float y) const;

    void render();

    void delete_selected();

    std::vector<double> get_current_print_zs(bool active_only) const;
    void set_toolpaths_range(double low, double high);

    std::vector<int> load_object(const ModelObject& model_object, int obj_idx, std::vector<int> instance_idxs);
    std::vector<int> load_object(const Model& model, int obj_idx);

    // Load SLA support tree and SLA pad meshes into the scene, if available at the respective SLAPrintObject instances.
    std::vector<int> load_support_meshes(const Model& model, int obj_idx);

    int get_first_volume_id(int obj_idx) const;
    int get_in_object_volume_id(int scene_vol_idx) const;

    void mirror_selection(Axis axis);

    void reload_scene(bool force);

    void load_gcode_preview(const GCodePreviewData& preview_data, const std::vector<std::string>& str_tool_colors);
    void load_preview(const std::vector<std::string>& str_tool_colors);

    void bind_event_handlers();
    void unbind_event_handlers();

    void on_size(wxSizeEvent& evt);
    void on_idle(wxIdleEvent& evt);
    void on_char(wxKeyEvent& evt);
    void on_mouse_wheel(wxMouseEvent& evt);
    void on_timer(wxTimerEvent& evt);
    void on_mouse(wxMouseEvent& evt);
    void on_paint(wxPaintEvent& evt);
    void on_key_down(wxKeyEvent& evt);

    Size get_canvas_size() const;
    Point get_local_mouse_position() const;

    void reset_legend_texture();

    void set_tooltip(const std::string& tooltip) const;

private:
    bool _is_shown_on_screen() const;
    void _force_zoom_to_bed();

    bool _init_toolbar();

#if ENABLE_USE_UNIQUE_GLCONTEXT
    bool _set_current();
#endif // ENABLE_USE_UNIQUE_GLCONTEXT
    void _resize(unsigned int w, unsigned int h);

    BoundingBoxf3 _max_bounding_box() const;

    void _zoom_to_bounding_box(const BoundingBoxf3& bbox);
    float _get_zoom_to_bounding_box_factor(const BoundingBoxf3& bbox) const;

    void _mark_volumes_for_layer_height() const;
    void _refresh_if_shown_on_screen();

    void _camera_tranform() const;
    void _picking_pass() const;
    void _render_background() const;
    void _render_bed(float theta) const;
    void _render_axes(bool depth_test) const;
    void _render_objects() const;
    void _render_selection() const;
    void _render_cutting_plane() const;
    void _render_warning_texture() const;
    void _render_legend_texture() const;
    void _render_layer_editing_overlay() const;
    void _render_volumes(bool fake_colors) const;
    void _render_current_gizmo() const;
    void _render_gizmos_overlay() const;
    void _render_toolbar() const;
#if ENABLE_SHOW_CAMERA_TARGET
    void _render_camera_target() const;
#endif // ENABLE_SHOW_CAMERA_TARGET

    void _update_volumes_hover_state() const;
    void _update_gizmos_data();

    float _get_layers_editing_cursor_z_relative() const;
    void _perform_layer_editing_action(wxMouseEvent* evt = nullptr);

    // Convert the screen space coordinate to an object space coordinate.
    // If the Z screen space coordinate is not provided, a depth buffer value is substituted.
    Vec3d _mouse_to_3d(const Point& mouse_pos, float* z = nullptr);

    // Convert the screen space coordinate to world coordinate on the bed.
    Vec3d _mouse_to_bed_3d(const Point& mouse_pos);

    // Returns the view ray line, in world coordinate, at the given mouse position.
    Linef3 mouse_ray(const Point& mouse_pos);

    void _start_timer();
    void _stop_timer();

    // Create 3D thick extrusion lines for a skirt and brim.
    // Adds a new Slic3r::GUI::3DScene::Volume to volumes.
    void _load_print_toolpaths();
    // Create 3D thick extrusion lines for object forming extrusions.
    // Adds a new Slic3r::GUI::3DScene::Volume to $self->volumes,
    // one for perimeters, one for infill and one for supports.
    void _load_print_object_toolpaths(const PrintObject& print_object, const std::vector<std::string>& str_tool_colors);
    // Create 3D thick extrusion lines for wipe tower extrusions
    void _load_wipe_tower_toolpaths(const std::vector<std::string>& str_tool_colors);

    // generates gcode extrusion paths geometry
    void _load_gcode_extrusion_paths(const GCodePreviewData& preview_data, const std::vector<float>& tool_colors);
    // generates gcode travel paths geometry
    void _load_gcode_travel_paths(const GCodePreviewData& preview_data, const std::vector<float>& tool_colors);
    bool _travel_paths_by_type(const GCodePreviewData& preview_data);
    bool _travel_paths_by_feedrate(const GCodePreviewData& preview_data);
    bool _travel_paths_by_tool(const GCodePreviewData& preview_data, const std::vector<float>& tool_colors);
    // generates gcode retractions geometry
    void _load_gcode_retractions(const GCodePreviewData& preview_data);
    // generates gcode unretractions geometry
    void _load_gcode_unretractions(const GCodePreviewData& preview_data);
    // generates objects and wipe tower geometry
    void _load_shells();
    // sets gcode geometry visibility according to user selection
    void _update_gcode_volumes_visibility(const GCodePreviewData& preview_data);
    void _update_toolpath_volumes_outside_state();
    void _show_warning_texture_if_needed();

    void _on_move();
    void _on_rotate();
    void _on_scale();
    void _on_flatten();
    void _on_mirror();

    // generates the legend texture in dependence of the current shown view type
    void _generate_legend_texture(const GCodePreviewData& preview_data, const std::vector<float>& tool_colors);

    // generates a warning texture containing the given message
    void _generate_warning_texture(const std::string& msg);
    void _reset_warning_texture();

    bool _is_any_volume_outside() const;

    void _resize_toolbar() const;

    static std::vector<float> _parse_colors(const std::vector<std::string>& colors);
};

} // namespace GUI
} // namespace Slic3r

#endif // slic3r_GLCanvas3D_hpp_