forked from bartvdbraak/blender
41f98978e3
OSL noise() function is generating NaN's in certain cases, fix for that goes to our OSL branch. Also add missing minimum weight and max closure checks to OSL, forgot to add these when fixing another bug.
47 lines
1.4 KiB
Plaintext
47 lines
1.4 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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shader node_rgb_ramp(
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color ramp_color[RAMP_TABLE_SIZE] = {0.0},
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float ramp_alpha[RAMP_TABLE_SIZE] = {0.0},
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float Fac = 0.0,
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output color Color = color(0.0, 0.0, 0.0),
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output float Alpha = 1.0)
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{
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float f = clamp(Fac, 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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Color = ramp_color[i];
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Alpha = ramp_alpha[i];
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if (t > 0.0) {
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Color = (1.0 - t) * Color + t * ramp_color[i + 1];
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Alpha = (1.0 - t) * Alpha + t * ramp_alpha[i + 1];
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}
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}
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