1776f75c3b
These values often either turn the node into a no-op, or even make it evaluate to 0 no matter what the other input value is, thus allowing deletion of a branch of the node graph that otherwise is not constant. Reviewed By: brecht Differential Revision: https://developer.blender.org/D2085
71 lines
2.0 KiB
C++
71 lines
2.0 KiB
C++
/*
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* Copyright 2011-2013 Blender Foundation
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*
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* Licensed under the Apache License, Version 2.0 (the "License");
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* you may not use this file except in compliance with the License.
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* You may obtain a copy of the License at
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*
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* http://www.apache.org/licenses/LICENSE-2.0
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*
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* Unless required by applicable law or agreed to in writing, software
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* distributed under the License is distributed on an "AS IS" BASIS,
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* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
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* See the License for the specific language governing permissions and
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* limitations under the License.
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*/
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#ifndef __CONSTANT_FOLD_H__
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#define __CONSTANT_FOLD_H__
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#include "util_types.h"
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#include "svm_types.h"
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CCL_NAMESPACE_BEGIN
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class ShaderGraph;
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class ShaderInput;
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class ShaderNode;
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class ShaderOutput;
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class ConstantFolder {
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public:
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ShaderGraph *const graph;
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ShaderNode *const node;
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ShaderOutput *const output;
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ConstantFolder(ShaderGraph *graph, ShaderNode *node, ShaderOutput *output);
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bool all_inputs_constant() const;
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/* Constant folding helpers */
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void make_constant(float value) const;
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void make_constant(float3 value) const;
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void make_constant_clamp(float value, bool clamp) const;
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void make_constant_clamp(float3 value, bool clamp) const;
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void make_zero() const;
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/* Bypass node, relinking to another output socket. */
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void bypass(ShaderOutput *output) const;
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/* For closure nodes, discard node entirely or bypass to one of its inputs. */
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void discard() const;
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void bypass_or_discard(ShaderInput *input) const;
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/* Bypass or make constant, unless we can't due to clamp being true. */
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bool try_bypass_or_make_constant(ShaderInput *input, bool clamp = false) const;
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/* Test if shader inputs of the current nodes have fixed values. */
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bool is_zero(ShaderInput *input) const;
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bool is_one(ShaderInput *input) const;
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/* Specific nodes. */
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void fold_mix(NodeMix type, bool clamp) const;
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void fold_math(NodeMath type, bool clamp) const;
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void fold_vector_math(NodeVectorMath type) const;
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};
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CCL_NAMESPACE_END
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#endif /* __CONSTANT_FOLD_H__ */
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