Differential D2023 Diff 6741 intern/cycles/kernel/closure/merge.h

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intern/cycles/kernel/closure/merge.h

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				/*
				* Copyright 2011-2016 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.
				*/

				CCL_NAMESPACE_BEGIN

				/* Merging
				*
				* This helps with branched path tracing, to avoid sampling identical BSDFs
				* separate, and also saves closures space. Particularly for shadow and emission
				* where we limit the number of closures more. */

				ccl_device_noinline void shader_merge_last_closure_without_data(ShaderData *sd)
				{
				const int last_closure = ccl_fetch(sd, num_closure) - 1;
				ShaderClosure *sc = ccl_fetch_array(sd, closure, last_closure);

				for(int i = 0; i < last_closure; i++) {
				ShaderClosure *merge_sc = ccl_fetch_array(sd, closure, i);

				if(merge_sc->type == sc->type) {
				merge_sc->weight += sc->weight;
				merge_sc->sample_weight = fabsf(average(merge_sc->weight));
				ccl_fetch(sd, num_closure) -= 1;
				return;
				}
				}
				}

				ccl_device_noinline void shader_merge_last_closure_with_data(ShaderData *sd)
				{
				const int last_closure = ccl_fetch(sd, num_closure) - 1;
				ShaderClosure *sc = ccl_fetch_array(sd, closure, last_closure);

				for(int i = 0; i < last_closure; i++) {
				ShaderClosure *merge_sc = ccl_fetch_array(sd, closure, i);

				#ifdef __OSL__
				if(sc->prim \|\| merge_sc->prim)
				continue;
				#endif

				if(!(sc->type == merge_sc->type && sc->data0 == merge_sc->data0 && sc->data1 == merge_sc->data1 && sc->data2 == merge_sc->data2))
				continue;

				if(CLOSURE_IS_BSDF_OR_BSSRDF(sc->type)) {
				if(!float3_equals(sc->N, merge_sc->N))
				continue;
				else if(CLOSURE_IS_BSDF_ANISOTROPIC(sc->type) && !float3_equals(sc->T, merge_sc->T))
				continue;
				}

				sc->weight += merge_sc->weight;
				sc->sample_weight = fabsf(average(sc->weight));

				ccl_fetch(sd, num_closure) -= 1;
				kernel_assert(sd->num_closure >= 0);
				return;
				}
				}

				CCL_NAMESPACE_END