forked from bartvdbraak/blender
43c04eefe3
range must be left to the default (0..1 and -1..1).
54 lines
1.6 KiB
Plaintext
54 lines
1.6 KiB
Plaintext
/*
|
|
* 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 + 1.0)*0.5, 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*2.0 - 1.0;
|
|
}
|
|
|
|
shader node_vector_curves(
|
|
color ramp[RAMP_TABLE_SIZE] = {0.0},
|
|
|
|
vector VectorIn = vector(0.0, 0.0, 0.0),
|
|
float Fac = 0.0,
|
|
output vector VectorOut = vector(0.0, 0.0, 0.0))
|
|
{
|
|
VectorOut[0] = ramp_lookup(ramp, VectorIn[0], 0);
|
|
VectorOut[1] = ramp_lookup(ramp, VectorIn[1], 1);
|
|
VectorOut[2] = ramp_lookup(ramp, VectorIn[2], 2);
|
|
|
|
VectorOut = mix(VectorIn, VectorOut, Fac);
|
|
}
|
|
|