ferrocad_occt 0.1.2

OCCT geometry backend for FerroCAD: implements the ferrocad_geom GeometryBackend
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//! Sibling cxx bridge over OCCT, reusing `opencascade-sys`'s types.
//!
//! `opencascade-sys` 0.3 builds geometry but does not bridge shape *history*
//! (`Modified`/`Generated`/`IsDeleted`, and the element maps lineage needs). Rather
//! than patching or forking the crate, this declares a second `#[cxx::bridge]` over
//! the same OCCT types and links the same libraries. The C++ side is
//! `include/fc_history.hxx`; the design is written up in `docs/occt-integration.md`
//! and verified in `spikes/occt-history-rs`.

// `common` is bridged for completeness and used when the trait grows an
// intersection operation; until then it is dead code.
#[allow(dead_code)]
#[cxx::bridge]
mod ffi {
    unsafe extern "C++" {
        include!("ferrocad_occt/include/fc_history.hxx");

        // Reuse the crate's opaque types. cxx shares these across bridges by path.
        type BRepAlgoAPI_Fuse = opencascade_sys::b_rep_algo_api::BRepAlgoAPI_Fuse;
        type BRepAlgoAPI_Cut = opencascade_sys::b_rep_algo_api::BRepAlgoAPI_Cut;
        type BRepAlgoAPI_Common = opencascade_sys::b_rep_algo_api::BRepAlgoAPI_Common;
        type TopoDS_Shape = opencascade_sys::topo_ds::TopoDS_Shape;
        type TopTools_IndexedMapOfShape = opencascade_sys::top_tools::TopTools_IndexedMapOfShape;

        /// `TopTools_IndexedMapOfShape::FindIndex`, which the crate does not bridge.
        fn fc_indexed_map_find_index(
            map: &TopTools_IndexedMapOfShape,
            shape: &TopoDS_Shape,
        ) -> i32;

        /// Serialise a shape to BREP bytes (in memory; the crate only does files).
        fn fc_brep_write(shape: &TopoDS_Shape, out: &mut Vec<u8>);
        /// Read a shape from BREP bytes; null on failure.
        fn fc_brep_read(data: &[u8]) -> UniquePtr<TopoDS_Shape>;

        fn fc_brep_fuse_modified(
            op: Pin<&mut BRepAlgoAPI_Fuse>,
            shape: &TopoDS_Shape,
            out: Pin<&mut TopTools_IndexedMapOfShape>,
        );
        fn fc_brep_fuse_generated(
            op: Pin<&mut BRepAlgoAPI_Fuse>,
            shape: &TopoDS_Shape,
            out: Pin<&mut TopTools_IndexedMapOfShape>,
        );
        fn fc_brep_fuse_is_deleted(op: Pin<&mut BRepAlgoAPI_Fuse>, shape: &TopoDS_Shape) -> bool;

        fn fc_brep_cut_modified(
            op: Pin<&mut BRepAlgoAPI_Cut>,
            shape: &TopoDS_Shape,
            out: Pin<&mut TopTools_IndexedMapOfShape>,
        );
        fn fc_brep_cut_generated(
            op: Pin<&mut BRepAlgoAPI_Cut>,
            shape: &TopoDS_Shape,
            out: Pin<&mut TopTools_IndexedMapOfShape>,
        );
        fn fc_brep_cut_is_deleted(op: Pin<&mut BRepAlgoAPI_Cut>, shape: &TopoDS_Shape) -> bool;

        fn fc_brep_common_modified(
            op: Pin<&mut BRepAlgoAPI_Common>,
            shape: &TopoDS_Shape,
            out: Pin<&mut TopTools_IndexedMapOfShape>,
        );
        fn fc_brep_common_generated(
            op: Pin<&mut BRepAlgoAPI_Common>,
            shape: &TopoDS_Shape,
            out: Pin<&mut TopTools_IndexedMapOfShape>,
        );
        fn fc_brep_common_is_deleted(
            op: Pin<&mut BRepAlgoAPI_Common>,
            shape: &TopoDS_Shape,
        ) -> bool;
    }
}

pub(crate) use ffi::*;