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/* SPDX-License-Identifier: GPL-2.0-or-later */
#include "GEO_uv_parametrizer.h"
#include "DNA_mesh_types.h"
#include "DNA_meshdata_types.h"
#include "BKE_mesh.h"
#include "UI_interface.h"
#include "UI_resources.h"
#include "node_geometry_util.hh"
namespace blender::nodes::node_geo_uv_unwrap_cc {
NODE_STORAGE_FUNCS(NodeGeometryUVUnwrap)
static void node_declare(NodeDeclarationBuilder &b)
{
b.add_input<decl::Bool>(N_("Selection"))
.default_value(true)
.hide_value()
.supports_field()
.description(N_("Faces to participate in the unwrap operation"));
b.add_input<decl::Bool>(N_("Seam"))
.hide_value()
.supports_field()
.description(N_("Edges to mark where the mesh is \"cut\" for the purposes of unwrapping"));
b.add_input<decl::Float>(N_("Margin"))
.default_value(0.001f)
.min(0.0f)
.max(1.0f)
.description(N_("Space between islands"));
b.add_input<decl::Bool>(N_("Fill Holes"))
.default_value(true)
.description(N_("Virtually fill holes in mesh before unwrapping, to better avoid overlaps "
"and preserve symmetry"));
b.add_output<decl::Vector>(N_("UV")).field_source().description(
N_("UV coordinates between 0 and 1 for each face corner in the selected faces"));
}
static void node_layout(uiLayout *layout, bContext * /*C*/, PointerRNA *ptr)
{
uiLayoutSetPropSep(layout, true);
uiLayoutSetPropDecorate(layout, false);
uiItemR(layout, ptr, "method", 0, "", ICON_NONE);
}
static void node_init(bNodeTree * /*tree*/, bNode *node)
{
NodeGeometryUVUnwrap *data = MEM_cnew<NodeGeometryUVUnwrap>(__func__);
data->method = GEO_NODE_UV_UNWRAP_METHOD_ANGLE_BASED;
node->storage = data;
}
static VArray<float3> construct_uv_gvarray(const Mesh &mesh,
const Field<bool> selection_field,
const Field<bool> seam_field,
const bool fill_holes,
const float margin,
const GeometryNodeUVUnwrapMethod method,
const eAttrDomain domain)
{
const Span<float3> positions = mesh.positions();
const Span<MEdge> edges = mesh.edges();
const Span<MPoly> polys = mesh.polys();
const Span<MLoop> loops = mesh.loops();
bke::MeshFieldContext face_context{mesh, ATTR_DOMAIN_FACE};
FieldEvaluator face_evaluator{face_context, polys.size()};
face_evaluator.add(selection_field);
face_evaluator.evaluate();
const IndexMask selection = face_evaluator.get_evaluated_as_mask(0);
if (selection.is_empty()) {
return {};
}
bke::MeshFieldContext edge_context{mesh, ATTR_DOMAIN_EDGE};
FieldEvaluator edge_evaluator{edge_context, edges.size()};
edge_evaluator.add(seam_field);
edge_evaluator.evaluate();
const IndexMask seam = edge_evaluator.get_evaluated_as_mask(0);
Array<float3> uv(loops.size(), float3(0));
ParamHandle *handle = GEO_uv_parametrizer_construct_begin();
for (const int mp_index : selection) {
const MPoly &mp = polys[mp_index];
Array<ParamKey, 16> mp_vkeys(mp.totloop);
Array<bool, 16> mp_pin(mp.totloop);
Array<bool, 16> mp_select(mp.totloop);
Array<const float *, 16> mp_co(mp.totloop);
Array<float *, 16> mp_uv(mp.totloop);
for (const int i : IndexRange(mp.totloop)) {
const MLoop &ml = loops[mp.loopstart + i];
mp_vkeys[i] = ml.v;
mp_co[i] = positions[ml.v];
mp_uv[i] = uv[mp.loopstart + i];
mp_pin[i] = false;
mp_select[i] = false;
}
GEO_uv_parametrizer_face_add(handle,
mp_index,
mp.totloop,
mp_vkeys.data(),
mp_co.data(),
mp_uv.data(),
mp_pin.data(),
mp_select.data());
}
for (const int i : seam) {
const MEdge &edge = edges[i];
ParamKey vkeys[2]{edge.v1, edge.v2};
GEO_uv_parametrizer_edge_set_seam(handle, vkeys);
}
/* TODO: once field input nodes are able to emit warnings (T94039), emit a
* warning if we fail to solve an island. */
GEO_uv_parametrizer_construct_end(handle, fill_holes, false, nullptr);
GEO_uv_parametrizer_lscm_begin(handle, false, method == GEO_NODE_UV_UNWRAP_METHOD_ANGLE_BASED);
GEO_uv_parametrizer_lscm_solve(handle, nullptr, nullptr);
GEO_uv_parametrizer_lscm_end(handle);
GEO_uv_parametrizer_average(handle, true, false, false);
GEO_uv_parametrizer_pack(handle, margin, true, true);
GEO_uv_parametrizer_flush(handle);
GEO_uv_parametrizer_delete(handle);
return mesh.attributes().adapt_domain<float3>(
VArray<float3>::ForContainer(std::move(uv)), ATTR_DOMAIN_CORNER, domain);
}
class UnwrapFieldInput final : public bke::MeshFieldInput {
private:
const Field<bool> selection;
const Field<bool> seam;
const bool fill_holes;
const float margin;
const GeometryNodeUVUnwrapMethod method;
public:
UnwrapFieldInput(const Field<bool> selection,
const Field<bool> seam,
const bool fill_holes,
const float margin,
const GeometryNodeUVUnwrapMethod method)
: bke::MeshFieldInput(CPPType::get<float3>(), "UV Unwrap Field"),
selection(selection),
seam(seam),
fill_holes(fill_holes),
margin(margin),
method(method)
{
category_ = Category::Generated;
}
GVArray get_varray_for_context(const Mesh &mesh,
const eAttrDomain domain,
const IndexMask /*mask*/) const final
{
return construct_uv_gvarray(mesh, selection, seam, fill_holes, margin, method, domain);
}
std::optional<eAttrDomain> preferred_domain(const Mesh & /*mesh*/) const override
{
return ATTR_DOMAIN_CORNER;
}
};
static void node_geo_exec(GeoNodeExecParams params)
{
const NodeGeometryUVUnwrap &storage = node_storage(params.node());
const GeometryNodeUVUnwrapMethod method = (GeometryNodeUVUnwrapMethod)storage.method;
const Field<bool> selection_field = params.extract_input<Field<bool>>("Selection");
const Field<bool> seam_field = params.extract_input<Field<bool>>("Seam");
const bool fill_holes = params.extract_input<bool>("Fill Holes");
const float margin = params.extract_input<float>("Margin");
params.set_output("UV",
Field<float3>(std::make_shared<UnwrapFieldInput>(
selection_field, seam_field, fill_holes, margin, method)));
}
} // namespace blender::nodes::node_geo_uv_unwrap_cc
void register_node_type_geo_uv_unwrap()
{
namespace file_ns = blender::nodes::node_geo_uv_unwrap_cc;
static bNodeType ntype;
geo_node_type_base(&ntype, GEO_NODE_UV_UNWRAP, "UV Unwrap", NODE_CLASS_CONVERTER);
ntype.initfunc = file_ns::node_init;
node_type_storage(
&ntype, "NodeGeometryUVUnwrap", node_free_standard_storage, node_copy_standard_storage);
ntype.declare = file_ns::node_declare;
ntype.geometry_node_execute = file_ns::node_geo_exec;
ntype.draw_buttons = file_ns::node_layout;
nodeRegisterType(&ntype);
}
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