Differential D12367 Diff 41308 intern/cycles/integrator/adaptive_sampling.cpp

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intern/cycles/integrator/adaptive_sampling.cpp

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				/*
				* Copyright 2011-2021 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.
				*/

				#include "integrator/adaptive_sampling.h"

				#include "util/util_math.h"

				CCL_NAMESPACE_BEGIN

				AdaptiveSampling::AdaptiveSampling()
				{
				}

				int AdaptiveSampling::align_samples(int start_sample, int num_samples) const
				{
				if (!use) {
				return num_samples;
				}

				/*
				* The naive implementation goes as following:
				*
				* int count = 1;
				* while (!need_filter(start_sample + count - 1) && count < num_samples) {
				* ++count;
				* }
				* return count;
				*/

				/* 0-based sample index at which first filtering will happen. */
				const int first_filter_sample = (min_samples + 1) \| (adaptive_step - 1);

				/* Allow as many samples as possible until the first filter sample. */
				if (start_sample + num_samples <= first_filter_sample) {
				return num_samples;
				}

				const int next_filter_sample = max(first_filter_sample, start_sample \| (adaptive_step - 1));

				const int num_samples_until_filter = next_filter_sample - start_sample + 1;

				return min(num_samples_until_filter, num_samples);
				}

				bool AdaptiveSampling::need_filter(int sample) const
				{
				if (!use) {
				return false;
				}

				if (sample <= min_samples) {
				return false;
				}

				return (sample & (adaptive_step - 1)) == (adaptive_step - 1);
				}

				CCL_NAMESPACE_END