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/*
* Copyright 2011, Blender Foundation.
*
* This program is free software; you can redistribute it and/or
* modify it under the terms of the GNU General Public License
* as published by the Free Software Foundation; either version 2
* of the License, or (at your option) any later version.
*
* This program is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
* GNU General Public License for more details.
*
* You should have received a copy of the GNU General Public License
* along with this program; if not, write to the Free Software Foundation,
* Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301, USA.
*/
#include "stdosl.h"
#include "oslutil.h"
float ramp_lookup(color ramp[RAMP_TABLE_SIZE], float at, int component)
{
float f = clamp(at, 0.0, 1.0) * (RAMP_TABLE_SIZE - 1);
/* clamp int as well in case of NaN */
int i = (int)f;
if (i < 0) i = 0;
if (i >= RAMP_TABLE_SIZE) i = RAMP_TABLE_SIZE - 1;
float t = f - (float)i;
float result = ramp[i][component];
if (t > 0.0)
result = (1.0 - t) * result + t * ramp[i + 1][component];
return result;
}
shader node_rgb_curves(
color ramp[RAMP_TABLE_SIZE] = {0.0},
color ColorIn = 0.0,
float Fac = 0.0,
output color ColorOut = 0.0)
{
ColorOut[0] = ramp_lookup(ramp, ColorIn[0], 0);
ColorOut[1] = ramp_lookup(ramp, ColorIn[1], 1);
ColorOut[2] = ramp_lookup(ramp, ColorIn[2], 2);
ColorOut = mix(ColorIn, ColorOut, Fac);
}
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