48 lines
1.4 KiB
Plaintext
48 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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int ramp_interpolate = 1,
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float Fac = 0.0,
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output color Color = 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 (ramp_interpolate && 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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