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solvecraft/harness/cpp/shim/sweep_api_surfaces.cpp
T
bherbruck 7423d1b908 port: sweep.api_surfaces (partial) 
SM_API surface and skin entry points (SmApiSurfaces.cpp, SmApiPrimitives.cpp):
extrude, sweep, ruled and skinned surfaces are ported and bit-identical to the
C++; skin primitive, skin from faces and surface of revolution validate and
copy their inputs as upstream, then stub SmPrimitiveCreation (deferred).
Adds the C++ shim, FFI binding, difftest runner and upstream-derived fixtures,
and records UB-74 (SmApiCreateSkinFromFaces with no faces segfaults).

difftest: cases=823 passed=774 failed=0 deferred=49

Co-Authored-By: Claude Opus 5.5 (1M context) <noreply@anthropic.com>
Claude-Session: https://claude.ai/code/session_01FsWWaoeGNWKgzeGrF2Pkn5
2026-10-13 20:40:04 -04:00

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// SPDX-License-Identifier: Apache-2.0
// difftest shim for unit `sweep.api_surfaces`: the SM_API surface and skin entry points of
// source/SM_API/src/SmApiSurfaces.cpp (SmApiCreateExtrude, SmApiCreateSweep,
// SmApiCreateRuledSurface, SmApiCreateSurfaceRevolution, SmApiCreateSkin) and
// source/SM_API/src/SmApiPrimitives.cpp (SmApiCreateSkinPrimitive, SmApiCreateSkinFromFaces),
// called exactly as a caller of the API would.
//
// One entry point, sc_sweep_api_surfaces_run(in, n_in, out, cap, out_len). `in` is
// `op args...`; layouts are documented in crates/solidcore-ffi/src/units/sweep_api_surfaces.rs,
// which validates every input so upstream only touches valid memory. Every read is bounds
// checked here as well (a malformed program is SC_ERR_ARG). The whole program is parsed before
// any upstream object is built. `out` receives the API status (0 = SM_SUCCESS, else the
// SmStatus) and the op's outputs.
#include "sc_shim.h"
#include "StdAfx.h"
#include <SmApiCurves.h>
#include <SmApiGeneral.h>
#include <SmApiPrimitives.h>
#include <SmApiSurfaces.h>
#include <SmBSplineCurve.h>
#include <SmBSplineSurface.h>
#include <SmBrep.h>
#include <SmCircle.h>
#include <SmContext.h>
#include <SmCurve.h>
#include <SmFace.h>
#include <SmLine.h>
#include <SmSurface.h>
#include <SmTArray.h>
#include <SmVector3d.h>
#include <nurbs.h>
#include <stdexcept>
#include <vector>
namespace
{
// Ops (keep in sync with crates/solidcore-ffi/src/units/sweep_api_surfaces.rs).
enum : int32_t
{
OP_EXTRUDE = 1,
OP_SWEEP = 2,
OP_RULED = 3,
OP_REVOLUTION = 4,
OP_SKIN = 5,
OP_SKIN_PRIMITIVE = 6,
OP_SKIN_FROM_FACES = 7,
};
// Curve kinds of a curve block.
enum : int32_t
{
CK_NULL = 0, // NULL
CK_NURB = 1, // SmBSplineCurve(gw_CURVE*, dim, FALSE)
CK_API_CURVE = 2, // SmApiCreateCurve(points)
CK_API_ARC = 3, // SmApiCreateArc(center, radius, start, end)
CK_API_CIRCLE = 4, // SmApiCreateCircle(center, radius, SmBSplineCurve*&)
CK_LINE_SEGMENT = 5, // SmApiCreateLineSegment(start, end) (SmCurve only)
CK_ANALYTIC_CIRCLE = 6, // SmApiCreateCircle(center, radius, SmCircle*&) (SmCurve only)
};
struct Bad : std::runtime_error
{
Bad() : std::runtime_error("bad program") {}
};
// Reads the protected STEP flags through pointers to members named in a derived class.
struct Peek : SmBSplineSurface
{
static SmKnotType SmBSplineSurface::*kt() { return &Peek::m_eKnotType; }
static SmBSplineSurfaceForm SmBSplineSurface::*form() { return &Peek::m_eBSplineSurfaceForm; }
};
struct Rd
{
const double* in;
int64_t n;
int64_t at;
double num()
{
if (at >= n)
throw Bad();
return in[at++];
}
int64_t idx(int64_t lo, int64_t hi)
{
double d = num();
if (!(d >= (double)lo && d <= (double)hi) || d != (double)(int64_t)d)
throw Bad();
return (int64_t)d;
}
bool flag() { return idx(0, 1) != 0; }
std::vector<double> nums(int64_t k)
{
std::vector<double> v;
for (int64_t i = 0; i < k; i++)
v.push_back(num());
return v;
}
};
// A parsed curve block.
struct CurveSpec
{
int32_t kind = CK_NULL;
int64_t dim = 3, n = 0, p = 0, m = 0;
std::vector<double> data;
};
CurveSpec read_spec(Rd& rd)
{
CurveSpec c;
c.kind = (int32_t)rd.idx(0, 6);
switch (c.kind)
{
case CK_NULL: break;
case CK_NURB:
c.dim = rd.idx(1, 3);
c.n = rd.idx(0, 4096);
c.p = rd.idx(0, 32);
c.m = rd.idx(0, 4096 + 33);
c.data = rd.nums(4 * (c.n + 1) + c.m + 1);
break;
case CK_API_CURVE:
{
int64_t np = rd.idx(0, 4096);
c.data = rd.nums(3 * np);
break;
}
case CK_API_ARC: c.data = rd.nums(6); break;
case CK_API_CIRCLE: c.data = rd.nums(4); break;
case CK_LINE_SEGMENT: c.data = rd.nums(6); break;
case CK_ANALYTIC_CIRCLE: c.data = rd.nums(4); break;
default: throw Bad();
}
return c;
}
SmVector3d v3(const double* d)
{
return SmVector3d(d[0], d[1], d[2]);
}
// Builds the curve of a parsed block (NULL for CK_NULL). A failing API constructor is a
// harness error (the Rust side builds the same curves and rejects the same inputs).
SmCurve* build_curve(const CurveSpec& c)
{
const SmContext& ctx = *SmApiGetOrCreateContext();
const double* d = c.data.data();
switch (c.kind)
{
case CK_NULL: return NULL;
case CK_NURB:
{
gw_CURVE* cur = sm_AllocateNurbCurve((gw_INDEX)c.n, (gw_DEGREE)c.p, (gw_INDEX)c.m);
int64_t at = 0;
for (int64_t i = 0; i <= c.n; i++)
{
cur->pol->Pw[i].x = d[at++];
cur->pol->Pw[i].y = d[at++];
cur->pol->Pw[i].z = d[at++];
cur->pol->Pw[i].w = d[at++];
}
for (int64_t i = 0; i <= c.m; i++)
cur->knt->U[i] = d[at++];
return new (ctx) SmBSplineCurve(cur, (ULONG)c.dim, FALSE);
}
case CK_API_CURVE:
{
SmTArray<SmPoint3d> pts;
for (size_t i = 0; i + 2 < c.data.size(); i += 3)
pts.Add(SmPoint3d(d[i], d[i + 1], d[i + 2]));
SmBSplineCurve* r = NULL;
if (SmApiCreateCurve(pts, r) != SM_SUCCESS || r == NULL)
throw Bad();
return r;
}
case CK_API_ARC:
{
SmBSplineCurve* r = NULL;
if (SmApiCreateArc(v3(d), d[3], d[4], d[5], r) != SM_SUCCESS || r == NULL)
throw Bad();
return r;
}
case CK_API_CIRCLE:
{
SmBSplineCurve* r = NULL;
if (SmApiCreateCircle(v3(d), d[3], r) != SM_SUCCESS || r == NULL)
throw Bad();
return r;
}
case CK_LINE_SEGMENT:
{
SmLine* r = NULL;
if (SmApiCreateLineSegment(v3(d), v3(d + 3), r) != SM_SUCCESS || r == NULL)
throw Bad();
return r;
}
case CK_ANALYTIC_CIRCLE:
{
SmCircle* r = NULL;
if (SmApiCreateCircle(v3(d), d[3], r) != SM_SUCCESS || r == NULL)
throw Bad();
return r;
}
default: throw Bad();
}
}
// Owns the curves built for one call.
struct Curves
{
std::vector<SmCurve*> all;
~Curves()
{
for (size_t i = 0; i < all.size(); i++)
delete all[i];
}
SmCurve* add(const CurveSpec& c)
{
all.push_back(NULL);
SmCurve* r = build_curve(c);
all.back() = r;
return r;
}
SmBSplineCurve* add_bspline(const CurveSpec& c)
{
if (c.kind == CK_NULL || c.kind >= CK_LINE_SEGMENT)
throw Bad();
return (SmBSplineCurve*)add(c);
}
};
double st(SmStatus s)
{
return s == SM_SUCCESS ? 0.0 : (double)s;
}
double flg(bool b)
{
return b ? 1.0 : 0.0;
}
// `has` then, when set, `has_nurb oob borrowed knot_type form [n m p q r s cpts u v]`.
void put_surface(std::vector<double>& o, const SmSurface* srf)
{
const SmBSplineSurface* s = dynamic_cast<const SmBSplineSurface*>(srf);
o.push_back(flg(s != NULL));
if (!s)
return;
const gw_SURFACE* sur = s->GetGwNurbPointer();
o.push_back(flg(sur != NULL));
o.push_back(flg(s->IsOutOfBoundsEnabled()));
o.push_back(flg(s->IsNurbBorrowed()));
o.push_back((double)(s->*Peek::kt()));
o.push_back((double)(s->*Peek::form()));
if (!sur)
return;
gw_INDEX n = sur->net->n;
gw_INDEX m = sur->net->m;
gw_INDEX r = sur->knu->m;
gw_INDEX ss = sur->knv->m;
o.push_back((double)n);
o.push_back((double)m);
o.push_back((double)sur->p);
o.push_back((double)sur->q);
o.push_back((double)r);
o.push_back((double)ss);
for (gw_INDEX i = 0; i <= n; i++)
for (gw_INDEX j = 0; j <= m; j++)
{
o.push_back(sur->net->Pw[i][j].x);
o.push_back(sur->net->Pw[i][j].y);
o.push_back(sur->net->Pw[i][j].z);
o.push_back(sur->net->Pw[i][j].w);
}
for (gw_INDEX i = 0; i <= r; i++)
o.push_back(sur->knu->U[i]);
for (gw_INDEX i = 0; i <= ss; i++)
o.push_back(sur->knv->U[i]);
}
// The status, then on success the created surface.
void put_result(std::vector<double>& o, SmApiStatus stat, SmSurface* res)
{
o.push_back(st(stat));
if (stat == SM_SUCCESS)
put_surface(o, res);
delete res;
}
void run(Rd& rd, std::vector<double>& o)
{
int32_t op = (int32_t)rd.idx(1, 7);
switch (op)
{
case OP_EXTRUDE:
{
CurveSpec cs = read_spec(rd);
std::vector<double> v = rd.nums(3);
if (rd.at != rd.n)
throw Bad();
Curves cv;
SmBSplineCurve* c = cv.add_bspline(cs);
SmSurface* res = NULL;
SmApiStatus stat = SmApiCreateExtrude(c, v3(v.data()), res);
put_result(o, stat, res);
// the extruded curve's NURB afterwards (NLib makes a 2D curve 3D in place)
const gw_CURVE* cur = c->GetGwNurbPointer();
o.push_back(flg(cur != NULL));
if (cur)
{
o.push_back((double)cur->pol->n);
for (gw_INDEX i = 0; i <= cur->pol->n; i++)
{
o.push_back(cur->pol->Pw[i].x);
o.push_back(cur->pol->Pw[i].y);
o.push_back(cur->pol->Pw[i].z);
o.push_back(cur->pol->Pw[i].w);
}
}
break;
}
case OP_SWEEP:
case OP_RULED:
{
CurveSpec a = read_spec(rd);
CurveSpec b = read_spec(rd);
if (rd.at != rd.n)
throw Bad();
Curves cv;
SmBSplineCurve* c1 = cv.add_bspline(a);
SmBSplineCurve* c2 = cv.add_bspline(b);
SmSurface* res = NULL;
SmApiStatus stat = op == OP_SWEEP ? SmApiCreateSweep(c1, c2, res)
: SmApiCreateRuledSurface(c1, c2, res);
put_result(o, stat, res);
break;
}
case OP_REVOLUTION:
{
CurveSpec cs = read_spec(rd);
std::vector<double> ax = rd.nums(7);
if (rd.at != rd.n)
throw Bad();
Curves cv;
SmBSplineCurve* c = cs.kind == CK_NULL ? NULL : cv.add_bspline(cs);
SmSurface* res = NULL;
SmApiStatus stat = SmApiCreateSurfaceRevolution(c, v3(ax.data()), v3(ax.data() + 3),
ax[6], res);
o.push_back(st(stat));
if (stat == SM_SUCCESS)
o.push_back(flg(res != NULL));
delete res;
break;
}
case OP_SKIN:
{
int64_t k = rd.idx(0, 64);
std::vector<CurveSpec> specs;
for (int64_t i = 0; i < k; i++)
specs.push_back(read_spec(rd));
if (rd.at != rd.n)
throw Bad();
Curves cv;
SmTArray<SmBSplineCurve*> profiles;
for (size_t i = 0; i < specs.size(); i++)
profiles.Add(cv.add_bspline(specs[i]));
SmSurface* res = NULL;
SmApiStatus stat = SmApiCreateSkin(profiles, res);
put_result(o, stat, res);
break;
}
case OP_SKIN_PRIMITIVE:
{
int64_t np = rd.idx(0, 64);
SmTArray<ULONG> counts;
for (int64_t i = 0; i < np; i++)
counts.Add((ULONG)rd.idx(0, 1 << 20));
int64_t nc = rd.idx(0, 256);
std::vector<CurveSpec> specs;
for (int64_t i = 0; i < nc; i++)
specs.push_back(read_spec(rd));
ULONG degree = (ULONG)rd.idx(0, 1 << 20);
bool cap = rd.flag();
if (rd.at != rd.n)
throw Bad();
Curves cv;
SmTArray<const SmCurve*> curves;
for (size_t i = 0; i < specs.size(); i++)
curves.Add(cv.add(specs[i]));
SmBrep* res = NULL;
SmTArray<SmFace*> start, side, end;
SmApiStatus stat = SmApiCreateSkinPrimitive(counts, curves, degree, cap ? TRUE : FALSE,
res, &start, &side, &end);
o.push_back(st(stat));
if (stat == SM_SUCCESS)
{
o.push_back(flg(res != NULL));
o.push_back((double)start.GetSize());
o.push_back((double)side.GetSize());
o.push_back((double)end.GetSize());
}
delete res;
break;
}
case OP_SKIN_FROM_FACES:
{
int64_t nf = rd.idx(0, 16);
std::vector<double> circles = rd.nums(4 * nf);
ULONG degree = (ULONG)rd.idx(1, 3);
if (rd.at != rd.n)
throw Bad();
std::vector<SmBrep*> planes;
SmTArray<SmFace*> faces;
bool ok = true;
for (int64_t i = 0; i < nf && ok; i++)
{
SmBrep* b = NULL;
const double* d = circles.data() + 4 * i;
if (SmApiCreatePlanarCircle(v3(d), d[3], b) != SM_SUCCESS || b == NULL)
{
ok = false;
break;
}
planes.push_back(b);
SmTArray<SmFace*> fs;
b->GetFaces(fs);
if (fs.GetSize() > 0)
faces.Add(fs[0]);
}
if (!ok)
{
for (size_t i = 0; i < planes.size(); i++)
delete planes[i];
throw Bad();
}
SmTArray<SmFace*> new_faces;
SmBrep* res = NULL;
SmApiStatus stat = SmApiCreateSkinFromFaces(faces, degree, new_faces, res);
o.push_back(st(stat));
if (stat == SM_SUCCESS)
{
o.push_back(flg(res != NULL));
o.push_back((double)new_faces.GetSize());
}
delete res;
for (size_t i = 0; i < planes.size(); i++)
delete planes[i];
break;
}
default: throw Bad();
}
}
} // namespace
SC_EXPORT int32_t sc_sweep_api_surfaces_run(const double* in, int64_t n_in, double* out,
int64_t cap, int64_t* out_len)
{
SC_TRY
SmApiGetOrCreateContext();
Rd rd{in, n_in, 0};
std::vector<double> o;
try
{
run(rd, o);
}
catch (const Bad&)
{
return SC_ERR_ARG;
}
return sc_copy_out(o.data(), (int64_t)o.size(), out, cap, out_len);
SC_CATCH
}
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