Differential D2084 Diff 7153 intern/cycles/kernel/shaders/node_rgb_curves.osl

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intern/cycles/kernel/shaders/node_rgb_curves.osl

	/*			/*
	* Copyright 2011-2013 Blender Foundation			* Copyright 2011-2013 Blender Foundation
	*			*
	* Licensed under the Apache License, Version 2.0 (the "License");			* Licensed under the Apache License, Version 2.0 (the "License");
	* you may not use this file except in compliance with the License.			* you may not use this file except in compliance with the License.
	* You may obtain a copy of the License at			* You may obtain a copy of the License at
	*			*
	* http://www.apache.org/licenses/LICENSE-2.0			* http://www.apache.org/licenses/LICENSE-2.0
	*			*
	* Unless required by applicable law or agreed to in writing, software			* Unless required by applicable law or agreed to in writing, software
	* distributed under the License is distributed on an "AS IS" BASIS,			* distributed under the License is distributed on an "AS IS" BASIS,
	* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.			* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
	* See the License for the specific language governing permissions and			* See the License for the specific language governing permissions and
	* limitations under the License.			* limitations under the License.
	*/			*/

	#include "stdosl.h"			#include "node_ramp_util.h"
	#include "oslutil.h"

	float ramp_lookup(color ramp[], float at, int component)
	{
	int table_size = arraylength(ramp);

	if (at < 0.0 \|\| at > 1.0) {
	float t0, dy;
	if (at < 0.0) {
	t0 = ramp[0][component];
	dy = t0 - ramp[1][component];
	at = -at;
	}
	else {
	t0 = ramp[table_size - 1][component];
	dy = t0 - ramp[table_size - 2][component];
	at = at - 1.0;
	}
	return t0 + dy * at * (table_size - 1);
	}

	float f = clamp(at, 0.0, 1.0) * (table_size - 1);

	/* clamp int as well in case of NaN */
	int i = (int)f;
	if (i < 0) i = 0;
	if (i >= table_size) i = 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;
	}

	shader node_rgb_curves(			shader node_rgb_curves(
	color ramp[] = {0.0},			color ramp[] = {0.0},
	float min_x = 0.0,			float min_x = 0.0,
	float max_x = 1.0,			float max_x = 1.0,

	color ColorIn = 0.0,			color ColorIn = 0.0,
	float Fac = 0.0,			float Fac = 0.0,
	output color ColorOut = 0.0)			output color ColorOut = 0.0)
	{			{
	color c = (ColorIn - color(min_x, min_x, min_x)) / (max_x - min_x);			color c = (ColorIn - color(min_x, min_x, min_x)) / (max_x - min_x);

	ColorOut[0] = ramp_lookup(ramp, c[0], 0);			color r = rgb_ramp_lookup(ramp, c[0], 1, 1);
	ColorOut[1] = ramp_lookup(ramp, c[1], 1);			color g = rgb_ramp_lookup(ramp, c[0], 1, 1);
	ColorOut[2] = ramp_lookup(ramp, c[2], 2);			color b = rgb_ramp_lookup(ramp, c[0], 1, 1);

				ColorOut[0] = r[0];
				ColorOut[1] = g[1];
				ColorOut[2] = b[2];

	ColorOut = mix(ColorIn, ColorOut, Fac);			ColorOut = mix(ColorIn, ColorOut, Fac);
	}			}