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/*
* Copyright 2011-2013 Blender Foundation
*
* Licensed under the Apache License, Version 2.0 (the "License");
* you may not use this file except in compliance with the License.
* You may obtain a copy of the License at
*
* http://www.apache.org/licenses/LICENSE-2.0
*
* Unless required by applicable law or agreed to in writing, software
* distributed under the License is distributed on an "AS IS" BASIS,
* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
* See the License for the specific language governing permissions and
* limitations under the License.
*/
#include "stdosl.h"
#include "node_texture.h"
/* Brick */
float brick_noise(int ns) /* fast integer noise */
{
int nn;
int n = (ns + 1013) & 2147483647;
n = (n >> 13) ^ n;
nn = (n * (n * n * 60493 + 19990303) + 1376312589) & 2147483647;
return 0.5 * ((float)nn / 1073741824.0);
}
float brick(point p,
float mortar_size,
float mortar_smooth,
float bias,
float BrickWidth,
float row_height,
float offset_amount,
int offset_frequency,
float squash_amount,
int squash_frequency,
output float tint)
{
int bricknum, rownum;
float offset = 0.0;
float brick_width = BrickWidth;
float x, y;
rownum = (int)floor(p[1] / row_height);
if (offset_frequency && squash_frequency) {
brick_width *= (rownum % squash_frequency) ? 1.0 : squash_amount; /* squash */
offset = (rownum % offset_frequency) ? 0.0 : (brick_width * offset_amount); /* offset */
}
bricknum = (int)floor((p[0] + offset) / brick_width);
x = (p[0] + offset) - brick_width * bricknum;
y = p[1] - row_height * rownum;
tint = clamp((brick_noise((rownum << 16) + (bricknum & 65535)) + bias), 0.0, 1.0);
float min_dist = min(min(x, y), min(brick_width - x, row_height - y));
if (min_dist >= mortar_size) {
return 0.0;
}
else if (mortar_smooth == 0.0) {
return 1.0;
}
else {
min_dist = 1.0 - min_dist / mortar_size;
return smoothstep(0.0, mortar_smooth, min_dist);
}
}
shader node_brick_texture(int use_mapping = 0,
matrix mapping = matrix(0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0),
float offset = 0.5,
int offset_frequency = 2,
float squash = 1.0,
int squash_frequency = 1,
point Vector = P,
color Color1 = 0.2,
color Color2 = 0.8,
color Mortar = 0.0,
float Scale = 5.0,
float MortarSize = 0.02,
float MortarSmooth = 0.0,
float Bias = 0.0,
float BrickWidth = 0.5,
float RowHeight = 0.25,
output float Fac = 0.0,
output color Color = 0.2)
{
point p = Vector;
if (use_mapping)
p = transform(mapping, p);
float tint = 0.0;
color Col = Color1;
Fac = brick(p * Scale,
MortarSize,
MortarSmooth,
Bias,
BrickWidth,
RowHeight,
offset,
offset_frequency,
squash,
squash_frequency,
tint);
if (Fac != 1.0) {
float facm = 1.0 - tint;
Col = facm * Color1 + tint * Color2;
}
Color = mix(Col, Mortar, Fac);
}
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