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intern/cycles/kernel/svm/svm_ramp_util.h
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| /* | |||||
| * 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. | |||||
| */ | |||||
| #ifndef __SVM_RAMP_UTIL_H__ | |||||
| #define __SVM_RAMP_UTIL_H__ | |||||
| CCL_NAMESPACE_BEGIN | |||||
| /* NOTE: svm_ramp.h, svm_ramp_util.h and node_ramp_util.h must stay consistent */ | |||||
| ccl_device float3 rgb_ramp_lookup(const float3 *ramp, | |||||
| float f, | |||||
| bool interpolate, | |||||
| bool extrapolate, | |||||
| int table_size) | |||||
| { | |||||
| if ((f < 0.0f || f > 1.0f) && extrapolate) { | |||||
| float3 t0, dy; | |||||
| if (f < 0.0f) { | |||||
| t0 = ramp[0]; | |||||
| dy = t0 - ramp[1], | |||||
| f = -f; | |||||
| } | |||||
| else { | |||||
| t0 = ramp[table_size - 1]; | |||||
| dy = t0 - ramp[table_size - 2]; | |||||
| f = f - 1.0f; | |||||
| } | |||||
| return t0 + dy * f * (table_size - 1); | |||||
| } | |||||
| f = clamp(f, 0.0f, 1.0f) * (table_size - 1); | |||||
| /* clamp int as well in case of NaN */ | |||||
| int i = clamp(float_to_int(f), 0, table_size-1); | |||||
| float t = f - (float)i; | |||||
| float3 result = ramp[i]; | |||||
| if (interpolate && t > 0.0f) | |||||
| result = (1.0f - t) * result + t * ramp[i + 1]; | |||||
| return result; | |||||
| } | |||||
| ccl_device float float_ramp_lookup(const float *ramp, | |||||
| float f, | |||||
| bool interpolate, | |||||
| bool extrapolate, | |||||
| int table_size) | |||||
| { | |||||
| if ((f < 0.0f || f > 1.0f) && extrapolate) { | |||||
| float t0, dy; | |||||
| if (f < 0.0f) { | |||||
| t0 = ramp[0]; | |||||
| dy = t0 - ramp[1], | |||||
| f = -f; | |||||
| } | |||||
| else { | |||||
| t0 = ramp[table_size - 1]; | |||||
| dy = t0 - ramp[table_size - 2]; | |||||
| f = f - 1.0f; | |||||
| } | |||||
| return t0 + dy * f * (table_size - 1); | |||||
| } | |||||
| f = clamp(f, 0.0f, 1.0f) * (table_size - 1); | |||||
| /* clamp int as well in case of NaN */ | |||||
| int i = clamp(float_to_int(f), 0, table_size-1); | |||||
| float t = f - (float)i; | |||||
| float result = ramp[i]; | |||||
| if (interpolate && t > 0.0f) | |||||
| result = (1.0f - t) * result + t * ramp[i + 1]; | |||||
| return result; | |||||
| } | |||||
| CCL_NAMESPACE_END | |||||
| #endif /* __SVM_RAMP_UTIL_H__ */ | |||||