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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"
shader node_rgb_ramp(
color ramp_color[RAMP_TABLE_SIZE] = {0.0},
float ramp_alpha[RAMP_TABLE_SIZE] = {0.0},
float Fac = 0.0,
output color Color = color(0.0, 0.0, 0.0),
output float Alpha = 1.0)
{
float f = clamp(Fac, 0.0, 1.0) * (RAMP_TABLE_SIZE - 1);
int i = (int)f;
float t = f - (float)i;
Color = ramp_color[i];
Alpha = ramp_alpha[i];
if (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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