2012-09-15 15:41:37 +00:00
|
|
|
/*
|
2013-08-18 14:16:15 +00:00
|
|
|
* Copyright 2011-2013 Blender Foundation
|
2012-09-15 15:41:37 +00:00
|
|
|
*
|
2013-08-18 14:16:15 +00:00
|
|
|
* 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
|
2012-09-15 15:41:37 +00:00
|
|
|
*
|
2013-08-18 14:16:15 +00:00
|
|
|
* http://www.apache.org/licenses/LICENSE-2.0
|
2012-09-15 15:41:37 +00:00
|
|
|
*
|
2013-08-18 14:16:15 +00:00
|
|
|
* 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
|
2012-09-15 15:41:37 +00:00
|
|
|
*/
|
|
|
|
|
|
|
|
#include "stdosl.h"
|
|
|
|
#include "oslutil.h"
|
|
|
|
|
|
|
|
shader node_rgb_ramp(
|
2012-10-19 03:07:58 +00:00
|
|
|
color ramp_color[RAMP_TABLE_SIZE] = {0.0},
|
|
|
|
float ramp_alpha[RAMP_TABLE_SIZE] = {0.0},
|
2013-05-10 11:44:24 +00:00
|
|
|
int ramp_interpolate = 1,
|
2012-09-15 15:41:37 +00:00
|
|
|
|
2012-10-19 03:07:58 +00:00
|
|
|
float Fac = 0.0,
|
2012-12-11 16:06:03 +00:00
|
|
|
output color Color = 0.0,
|
2012-10-19 03:07:58 +00:00
|
|
|
output float Alpha = 1.0)
|
2012-09-15 15:41:37 +00:00
|
|
|
{
|
2012-10-19 03:07:58 +00:00
|
|
|
float f = clamp(Fac, 0.0, 1.0) * (RAMP_TABLE_SIZE - 1);
|
2012-09-15 15:41:37 +00:00
|
|
|
|
2012-12-03 12:21:44 +00:00
|
|
|
/* clamp int as well in case of NaN */
|
2012-10-19 03:07:58 +00:00
|
|
|
int i = (int)f;
|
2012-12-03 13:58:08 +00:00
|
|
|
if (i < 0) i = 0;
|
|
|
|
if (i >= RAMP_TABLE_SIZE) i = RAMP_TABLE_SIZE - 1;
|
2012-10-19 03:07:58 +00:00
|
|
|
float t = f - (float)i;
|
2012-09-15 15:41:37 +00:00
|
|
|
|
2012-10-19 03:07:58 +00:00
|
|
|
Color = ramp_color[i];
|
|
|
|
Alpha = ramp_alpha[i];
|
2012-09-15 15:41:37 +00:00
|
|
|
|
2013-05-10 11:44:24 +00:00
|
|
|
if (ramp_interpolate && t > 0.0) {
|
2012-10-19 03:07:58 +00:00
|
|
|
Color = (1.0 - t) * Color + t * ramp_color[i + 1];
|
|
|
|
Alpha = (1.0 - t) * Alpha + t * ramp_alpha[i + 1];
|
|
|
|
}
|
2012-09-15 15:41:37 +00:00
|
|
|
}
|
|
|
|
|