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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.
*/
/* NOTE: svm_ramp.h, svm_ramp_util.h and node_ramp_util.h must stay consistent */
color rgb_ramp_lookup(color ramp[], float at, int interpolate, int extrapolate)
{
float f = at;
int table_size = arraylength(ramp);
if ((f < 0.0 || f > 1.0) && extrapolate) {
color t0, dy;
if (f < 0.0) {
t0 = ramp[0];
dy = t0 - ramp[1];
f = -f;
}
else {
t0 = ramp[table_size - 1];
dy = t0 - ramp[table_size - 2];
f = f - 1.0;
}
return t0 + dy * f * (table_size - 1);
}
f = clamp(at, 0.0, 1.0) * (table_size - 1);
/* clamp int as well in case of NaN */
int i = (int)f;
if (i < 0) i = 0;
if (i >= table_size) i = table_size - 1;
float t = f - (float)i;
color result = ramp[i];
if (interpolate && t > 0.0)
result = (1.0 - t) * result + t * ramp[i + 1];
return result;
}
float rgb_ramp_lookup(float ramp[], float at, int interpolate, int extrapolate)
{
float f = at;
int table_size = arraylength(ramp);
if ((f < 0.0 || f > 1.0) && extrapolate) {
float t0, dy;
if (f < 0.0) {
t0 = ramp[0];
dy = t0 - ramp[1];
f = -f;
}
else {
t0 = ramp[table_size - 1];
dy = t0 - ramp[table_size - 2];
f = f - 1.0;
}
return t0 + dy * f * (table_size - 1);
}
f = clamp(at, 0.0, 1.0) * (table_size - 1);
/* clamp int as well in case of NaN */
int i = (int)f;
if (i < 0) i = 0;
if (i >= table_size) i = table_size - 1;
float t = f - (float)i;
float result = ramp[i];
if (interpolate && t > 0.0)
result = (1.0 - t) * result + t * ramp[i + 1];
return result;
}
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