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/* SPDX-License-Identifier: GPL-2.0-or-later */
#include "DNA_mesh_types.h"
#include "DNA_meshdata_types.h"
#include "BKE_material.h"
#include "BKE_mesh.h"
#include "UI_interface.h"
#include "UI_resources.h"
#include "node_geometry_util.hh"
namespace blender::nodes::node_geo_mesh_primitive_circle_cc {
NODE_STORAGE_FUNCS(NodeGeometryMeshCircle)
static void node_declare(NodeDeclarationBuilder &b)
{
b.add_input<decl::Int>(N_("Vertices"))
.default_value(32)
.min(3)
.description(N_("Number of vertices on the circle"));
b.add_input<decl::Float>(N_("Radius"))
.default_value(1.0f)
.min(0.0f)
.subtype(PROP_DISTANCE)
.description(N_("Distance of the vertices from the origin"));
b.add_output<decl::Geometry>(N_("Mesh"));
}
static void node_layout(uiLayout *layout, bContext * /*C*/, PointerRNA *ptr)
{
uiLayoutSetPropSep(layout, true);
uiLayoutSetPropDecorate(layout, false);
uiItemR(layout, ptr, "fill_type", 0, nullptr, ICON_NONE);
}
static void node_init(bNodeTree * /*tree*/, bNode *node)
{
NodeGeometryMeshCircle *node_storage = MEM_cnew<NodeGeometryMeshCircle>(__func__);
node_storage->fill_type = GEO_NODE_MESH_CIRCLE_FILL_NONE;
node->storage = node_storage;
}
static int circle_vert_total(const GeometryNodeMeshCircleFillType fill_type, const int verts_num)
{
switch (fill_type) {
case GEO_NODE_MESH_CIRCLE_FILL_NONE:
case GEO_NODE_MESH_CIRCLE_FILL_NGON:
return verts_num;
case GEO_NODE_MESH_CIRCLE_FILL_TRIANGLE_FAN:
return verts_num + 1;
}
BLI_assert_unreachable();
return 0;
}
static int circle_edge_total(const GeometryNodeMeshCircleFillType fill_type, const int verts_num)
{
switch (fill_type) {
case GEO_NODE_MESH_CIRCLE_FILL_NONE:
case GEO_NODE_MESH_CIRCLE_FILL_NGON:
return verts_num;
case GEO_NODE_MESH_CIRCLE_FILL_TRIANGLE_FAN:
return verts_num * 2;
}
BLI_assert_unreachable();
return 0;
}
static int circle_corner_total(const GeometryNodeMeshCircleFillType fill_type, const int verts_num)
{
switch (fill_type) {
case GEO_NODE_MESH_CIRCLE_FILL_NONE:
return 0;
case GEO_NODE_MESH_CIRCLE_FILL_NGON:
return verts_num;
case GEO_NODE_MESH_CIRCLE_FILL_TRIANGLE_FAN:
return verts_num * 3;
}
BLI_assert_unreachable();
return 0;
}
static int circle_face_total(const GeometryNodeMeshCircleFillType fill_type, const int verts_num)
{
switch (fill_type) {
case GEO_NODE_MESH_CIRCLE_FILL_NONE:
return 0;
case GEO_NODE_MESH_CIRCLE_FILL_NGON:
return 1;
case GEO_NODE_MESH_CIRCLE_FILL_TRIANGLE_FAN:
return verts_num;
}
BLI_assert_unreachable();
return 0;
}
static Mesh *create_circle_mesh(const float radius,
const int verts_num,
const GeometryNodeMeshCircleFillType fill_type)
{
Mesh *mesh = BKE_mesh_new_nomain(circle_vert_total(fill_type, verts_num),
circle_edge_total(fill_type, verts_num),
0,
circle_corner_total(fill_type, verts_num),
circle_face_total(fill_type, verts_num));
BKE_id_material_eval_ensure_default_slot(&mesh->id);
MutableSpan<float3> positions = mesh->positions_for_write();
MutableSpan<MEdge> edges = mesh->edges_for_write();
MutableSpan<MPoly> polys = mesh->polys_for_write();
MutableSpan<MLoop> loops = mesh->loops_for_write();
/* Assign vertex coordinates. */
const float angle_delta = 2.0f * (M_PI / float(verts_num));
for (const int i : IndexRange(verts_num)) {
const float angle = i * angle_delta;
positions[i] = float3(std::cos(angle) * radius, std::sin(angle) * radius, 0.0f);
}
if (fill_type == GEO_NODE_MESH_CIRCLE_FILL_TRIANGLE_FAN) {
positions.last() = float3(0);
}
/* Create outer edges. */
const short edge_flag = (fill_type == GEO_NODE_MESH_CIRCLE_FILL_NONE) ?
ME_LOOSEEDGE :
(ME_EDGEDRAW | ME_EDGERENDER); /* NGON or TRIANGLE_FAN */
for (const int i : IndexRange(verts_num)) {
MEdge &edge = edges[i];
edge.v1 = i;
edge.v2 = (i + 1) % verts_num;
edge.flag = edge_flag;
}
/* Create triangle fan edges. */
if (fill_type == GEO_NODE_MESH_CIRCLE_FILL_TRIANGLE_FAN) {
for (const int i : IndexRange(verts_num)) {
MEdge &edge = edges[verts_num + i];
edge.v1 = verts_num;
edge.v2 = i;
edge.flag = ME_EDGEDRAW | ME_EDGERENDER;
}
}
/* Create corners and faces. */
if (fill_type == GEO_NODE_MESH_CIRCLE_FILL_NGON) {
MPoly &poly = polys[0];
poly.loopstart = 0;
poly.totloop = loops.size();
for (const int i : IndexRange(verts_num)) {
MLoop &loop = loops[i];
loop.e = i;
loop.v = i;
}
}
else if (fill_type == GEO_NODE_MESH_CIRCLE_FILL_TRIANGLE_FAN) {
for (const int i : IndexRange(verts_num)) {
MPoly &poly = polys[i];
poly.loopstart = 3 * i;
poly.totloop = 3;
MLoop &loop_a = loops[3 * i];
loop_a.e = i;
loop_a.v = i;
MLoop &loop_b = loops[3 * i + 1];
loop_b.e = verts_num + ((i + 1) % verts_num);
loop_b.v = (i + 1) % verts_num;
MLoop &loop_c = loops[3 * i + 2];
loop_c.e = verts_num + i;
loop_c.v = verts_num;
}
}
return mesh;
}
static void node_geo_exec(GeoNodeExecParams params)
{
const NodeGeometryMeshCircle &storage = node_storage(params.node());
const GeometryNodeMeshCircleFillType fill = (GeometryNodeMeshCircleFillType)storage.fill_type;
const float radius = params.extract_input<float>("Radius");
const int verts_num = params.extract_input<int>("Vertices");
if (verts_num < 3) {
params.error_message_add(NodeWarningType::Info, TIP_("Vertices must be at least 3"));
params.set_default_remaining_outputs();
return;
}
Mesh *mesh = create_circle_mesh(radius, verts_num, fill);
params.set_output("Mesh", GeometrySet::create_with_mesh(mesh));
}
} // namespace blender::nodes::node_geo_mesh_primitive_circle_cc
void register_node_type_geo_mesh_primitive_circle()
{
namespace file_ns = blender::nodes::node_geo_mesh_primitive_circle_cc;
static bNodeType ntype;
geo_node_type_base(&ntype, GEO_NODE_MESH_PRIMITIVE_CIRCLE, "Mesh Circle", NODE_CLASS_GEOMETRY);
node_type_init(&ntype, file_ns::node_init);
node_type_storage(
&ntype, "NodeGeometryMeshCircle", node_free_standard_storage, node_copy_standard_storage);
ntype.geometry_node_execute = file_ns::node_geo_exec;
ntype.draw_buttons = file_ns::node_layout;
ntype.declare = file_ns::node_declare;
nodeRegisterType(&ntype);
}
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