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/* SPDX-License-Identifier: Apache-2.0
* Copyright 2011-2022 Blender Foundation */
#include "oslutil.h"
#include "stdcycles.h"
shader node_wireframe(string bump_offset = "center",
int use_pixel_size = 0,
float Size = 0.01,
output float Fac = 0.0)
{
Fac = wireframe("triangles", Size, use_pixel_size);
/* TODO(sergey): Since we can't use autodiff here we do algebraic
* calculation of derivatives by definition. We could probably
* optimize this a bit by doing some extra calculation in wireframe().
*/
if (bump_offset == "dx") {
point dx = Dx(P);
P -= dx;
Fac += (Fac - wireframe("triangles", Size, use_pixel_size)) / length(dx);
}
else if (bump_offset == "dy") {
point dy = Dy(P);
P -= dy;
Fac += (Fac - wireframe("triangles", Size, use_pixel_size)) / length(dy);
}
}
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