forked from bartvdbraak/blender
54 lines
1.6 KiB
Plaintext
54 lines
1.6 KiB
Plaintext
/*
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* Copyright 2011, Blender Foundation.
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*
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* This program is free software; you can redistribute it and/or
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* modify it under the terms of the GNU General Public License
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* as published by the Free Software Foundation; either version 2
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* of the License, or (at your option) any later version.
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*
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* This program is distributed in the hope that it will be useful,
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* but WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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* GNU General Public License for more details.
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*
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* You should have received a copy of the GNU General Public License
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* along with this program; if not, write to the Free Software Foundation,
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* Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301, USA.
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*/
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#include "stdosl.h"
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#include "oslutil.h"
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float ramp_lookup(color ramp[RAMP_TABLE_SIZE], float at, int component)
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{
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float f = clamp((at + 1.0) * 0.5, 0.0, 1.0) * (RAMP_TABLE_SIZE - 1);
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/* clamp int as well in case of NaN */
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int i = (int)f;
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if (i < 0) i = 0;
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if (i >= RAMP_TABLE_SIZE) i = RAMP_TABLE_SIZE - 1;
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float t = f - (float)i;
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float result = ramp[i][component];
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if (t > 0.0)
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result = (1.0 - t) * result + t * ramp[i + 1][component];
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return result * 2.0 - 1.0;
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}
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shader node_vector_curves(
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color ramp[RAMP_TABLE_SIZE] = {0.0},
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vector VectorIn = vector(0.0, 0.0, 0.0),
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float Fac = 0.0,
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output vector VectorOut = vector(0.0, 0.0, 0.0))
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{
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VectorOut[0] = ramp_lookup(ramp, VectorIn[0], 0);
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VectorOut[1] = ramp_lookup(ramp, VectorIn[1], 1);
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VectorOut[2] = ramp_lookup(ramp, VectorIn[2], 2);
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VectorOut = mix(VectorIn, VectorOut, Fac);
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}
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