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/*
* This program is free software; you can redistribute it and/or
* modify it under the terms of the GNU General Public License
* as published by the Free Software Foundation; either version 2
* of the License, or (at your option) any later version.
*
* This program is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
* GNU General Public License for more details.
*
* You should have received a copy of the GNU General Public License
* along with this program; if not, write to the Free Software Foundation,
* Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301, USA.
*/
#include "BKE_spline.hh"
#include "node_geometry_util.hh"
namespace blender::nodes {
static void geo_node_curve_primitive_quadratic_bezier_declare(NodeDeclarationBuilder &b)
{
b.add_input<decl::Int>("Resolution").default_value(16).min(3).max(256).subtype(PROP_UNSIGNED);
b.add_input<decl::Vector>("Start").default_value({-1.0f, 0.0f, 0.0f}).subtype(PROP_TRANSLATION);
b.add_input<decl::Vector>("Middle").default_value({0.0f, 2.0f, 0.0f}).subtype(PROP_TRANSLATION);
b.add_input<decl::Vector>("End").default_value({1.0f, 0.0f, 0.0f}).subtype(PROP_TRANSLATION);
b.add_output<decl::Geometry>("Curve");
}
static std::unique_ptr<CurveEval> create_quadratic_bezier_curve(const float3 p1,
const float3 p2,
const float3 p3,
const int resolution)
{
std::unique_ptr<CurveEval> curve = std::make_unique<CurveEval>();
std::unique_ptr<PolySpline> spline = std::make_unique<PolySpline>();
const float step = 1.0f / resolution;
for (int i : IndexRange(resolution + 1)) {
const float factor = step * i;
const float3 q1 = float3::interpolate(p1, p2, factor);
const float3 q2 = float3::interpolate(p2, p3, factor);
const float3 out = float3::interpolate(q1, q2, factor);
spline->add_point(out, 1.0f, 0.0f);
}
spline->attributes.reallocate(spline->size());
curve->add_spline(std::move(spline));
curve->attributes.reallocate(curve->splines().size());
return curve;
}
static void geo_node_curve_primitive_quadratic_bezier_exec(GeoNodeExecParams params)
{
std::unique_ptr<CurveEval> curve = create_quadratic_bezier_curve(
params.extract_input<float3>("Start"),
params.extract_input<float3>("Middle"),
params.extract_input<float3>("End"),
std::max(params.extract_input<int>("Resolution"), 3));
params.set_output("Curve", GeometrySet::create_with_curve(curve.release()));
}
} // namespace blender::nodes
void register_node_type_geo_curve_primitive_quadratic_bezier()
{
static bNodeType ntype;
geo_node_type_base(&ntype,
GEO_NODE_CURVE_PRIMITIVE_QUADRATIC_BEZIER,
"Quadratic Bezier",
NODE_CLASS_GEOMETRY,
0);
ntype.declare = blender::nodes::geo_node_curve_primitive_quadratic_bezier_declare;
ntype.geometry_node_execute = blender::nodes::geo_node_curve_primitive_quadratic_bezier_exec;
nodeRegisterType(&ntype);
}
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