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intern/cycles/kernel/shaders/node_ramp_util.h
- This file was added.
| /* | |||||
| * Copyright 2011-2013 Blender Foundation | |||||
| * | |||||
| * Licensed under the Apache License, Version 2.0 (the "License"); | |||||
| * you may not use this file except in compliance with the License. | |||||
| * You may obtain a copy of the License at | |||||
| * | |||||
| * http://www.apache.org/licenses/LICENSE-2.0 | |||||
| * | |||||
| * Unless required by applicable law or agreed to in writing, software | |||||
| * distributed under the License is distributed on an "AS IS" BASIS, | |||||
| * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. | |||||
| * See the License for the specific language governing permissions and | |||||
| * limitations under the License. | |||||
| */ | |||||
| /* NOTE: svm_ramp.h, svm_ramp_util.h and node_ramp_util.h must stay consistent */ | |||||
| color rgb_ramp_lookup(color ramp[], float at, int interpolate, int extrapolate) | |||||
| { | |||||
| float f = at; | |||||
| int table_size = arraylength(ramp); | |||||
| if ((f < 0.0 || f > 1.0) && extrapolate) { | |||||
| color t0, dy; | |||||
| if (f < 0.0) { | |||||
| t0 = ramp[0]; | |||||
| dy = t0 - ramp[1]; | |||||
| f = -f; | |||||
| } | |||||
| else { | |||||
| t0 = ramp[table_size - 1]; | |||||
| dy = t0 - ramp[table_size - 2]; | |||||
| f = f - 1.0; | |||||
| } | |||||
| return t0 + dy * f * (table_size - 1); | |||||
| } | |||||
| 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; | |||||
| color result = ramp[i]; | |||||
| if (interpolate && t > 0.0) | |||||
| result = (1.0 - t) * result + t * ramp[i + 1]; | |||||
| return result; | |||||
| } | |||||
| float rgb_ramp_lookup(float ramp[], float at, int interpolate, int extrapolate) | |||||
| { | |||||
| float f = at; | |||||
| int table_size = arraylength(ramp); | |||||
| if ((f < 0.0 || f > 1.0) && extrapolate) { | |||||
| float t0, dy; | |||||
| if (f < 0.0) { | |||||
| t0 = ramp[0]; | |||||
| dy = t0 - ramp[1]; | |||||
| f = -f; | |||||
| } | |||||
| else { | |||||
| t0 = ramp[table_size - 1]; | |||||
| dy = t0 - ramp[table_size - 2]; | |||||
| f = f - 1.0; | |||||
| } | |||||
| return t0 + dy * f * (table_size - 1); | |||||
| } | |||||
| 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]; | |||||
| if (interpolate && t > 0.0) | |||||
| result = (1.0 - t) * result + t * ramp[i + 1]; | |||||
| return result; | |||||
| } | |||||