Differential D2089 Diff 7087 intern/cycles/render/constant_fold.h

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intern/cycles/render/constant_fold.h

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				/*
				* Copyright 2011-2013 Blender Foundation
				*
				dingtoUnsubmitted Not Done Inline Actions Picky, should be 2011-2016 as it's new code. dingto: Picky, should be 2011-2016 as it's new code.
				* 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 __CONSTANT_FOLD_H__
				#define __CONSTANT_FOLD_H__

				#include "util_types.h"

				CCL_NAMESPACE_BEGIN

				class ShaderGraph;
				class ShaderInput;
				class ShaderNode;
				class ShaderOutput;
				sergeyUnsubmitted Not Done Inline Actions In other areas we put const in the front. sergey: In other areas we put const in the front.
				angavrilovUnsubmitted Not Done Inline Actions It's just weirdness of the C/C++ syntax: `const Foo bar` is a mutable field bar that contains a pointer to immutable Foo. `Foo const bar` is an immutable field bar that contains a pointer to mutable Foo. angavrilov: It's just weirdness of the C/C++ syntax: * `const Foo *bar` is a mutable field bar that…
				sergeyUnsubmitted Not Done Inline Actions Oh, well. Guess we'll just live with that and accept C++ weirdeness. Not as if we've got options here. sergey: Oh, well. Guess we'll just live with that and accept C++ weirdeness. Not as if we've got…

				class ConstantFolder {
				public:
				ShaderGraph *const graph;
				ShaderNode *const node;
				ShaderOutput *const output;

				ConstantFolder(ShaderGraph graph, ShaderNode node, ShaderOutput *output);

				bool all_inputs_constant() const;

				/* Constant folding helpers, always return true for convenience. */
				void make_constant(float value) const;
				void make_constant(float3 value) const;
				void make_constant_clamp(float value, bool clamp) const;
				void make_constant_clamp(float3 value, bool clamp) const;

				/* Bypass node, relinking to another output socket. */
				void bypass(ShaderOutput *output) const;

				/* For closure nodes, discard node entirely or bypass to one of its inputs. */
				void discard() const;
				void bypass_or_discard(ShaderInput *input) const;

				/* Bypass or make constant, unless we can't due to clamp being true. */
				bool try_bypass_or_make_constant(ShaderInput *input, float3 input_value, bool clamp) const;
				};

				CCL_NAMESPACE_END

				#endif /* __CONSTANT_FOLD_H__ */