Merge some BS1.7 changes:

Boolean operation feature

src/slic3r/GUI/Gizmos/GLGizmoMeshBoolean.hpp

@@ -0,0 +1,88 @@
+#ifndef slic3r_GLGizmoMeshBoolean_hpp_
+#define slic3r_GLGizmoMeshBoolean_hpp_
+
+#include "GLGizmoBase.hpp"
+#include "GLGizmosCommon.hpp"
+#include "libslic3r/Model.hpp"
+
+namespace Slic3r {
+
+namespace GUI {
+
+enum class MeshBooleanSelectingState {
+    Undef,
+    SelectSource,
+    SelectTool,
+
+};
+enum class MeshBooleanOperation{
+    Undef,
+    Union,
+    Difference,
+    Intersection,
+};
+struct VolumeInfo {
+    ModelVolume* mv{ nullptr };
+    int volume_idx{-1};
+    Transform3d trafo;
+    void reset() {
+        mv = nullptr;
+        volume_idx = -1;
+        trafo = Transform3d::Identity();
+    };
+    template<class Archive>
+    void serialize(Archive& ar) {
+        ar(volume_idx, trafo);
+    }
+};
+class GLGizmoMeshBoolean : public GLGizmoBase
+{
+public:
+    GLGizmoMeshBoolean(GLCanvas3D& parent, const std::string& icon_filename, unsigned int sprite_id);
+    ~GLGizmoMeshBoolean();
+
+    void set_enable(bool enable) { m_enable = enable; }
+    bool get_enable() { return m_enable; }
+    MeshBooleanSelectingState get_selecting_state() { return m_selecting_state; }
+    void set_src_volume(ModelVolume* mv) { 
+        m_src.mv = mv;
+        if (m_src.mv == m_tool.mv)
+            m_tool.reset();
+    }
+    void set_tool_volume(ModelVolume* mv) { 
+        m_tool.mv = mv;
+        if (m_tool.mv == m_src.mv)
+            m_src.reset();
+    }
+
+    bool gizmo_event(SLAGizmoEventType action, const Vec2d& mouse_position, bool shift_down, bool alt_down, bool control_down);
+
+protected:
+    virtual bool on_init() override;
+    virtual std::string on_get_name() const override;
+    virtual bool on_is_activable() const override;
+    virtual void on_render() override;
+    virtual void on_render_for_picking() override {}
+    virtual void on_set_state() override;
+    virtual CommonGizmosDataID on_get_requirements() const override;
+    virtual void on_render_input_window(float x, float y, float bottom_limit);
+
+    void on_load(cereal::BinaryInputArchive &ar) override;
+    void on_save(cereal::BinaryOutputArchive &ar) const override;
+
+private:
+    bool m_enable{ false };
+    MeshBooleanOperation m_operation_mode;
+    MeshBooleanSelectingState m_selecting_state;
+    bool m_diff_delete_input = false;
+    bool m_inter_delete_input = false;
+    VolumeInfo m_src;
+    VolumeInfo m_tool;
+
+    void generate_new_volume(bool delete_input, const TriangleMesh& mesh_result);
+};
+
+} // namespace GUI
+} // namespace Slic3r
+
+#endif // slic3r_GLGizmoMeshBoolean_hpp_