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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 "oslutil.h"
shader node_rgb_ramp(
color ramp_color[] = {0.0},
float ramp_alpha[] = {0.0},
int ramp_interpolate = 1,
float Fac = 0.0,
output color Color = 0.0,
output float Alpha = 1.0)
{
int table_size = arraylength(ramp_color);
float f = clamp(Fac, 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 = ramp_color[i];
Alpha = ramp_alpha[i];
if (ramp_interpolate && t > 0.0) {
Color = (1.0 - t) * Color + t * ramp_color[i + 1];
Alpha = (1.0 - t) * Alpha + t * ramp_alpha[i + 1];
}
}
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