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/* SPDX-License-Identifier: Apache-2.0
* Copyright 2011-2022 Blender Foundation */
#ifndef __CONSTANT_FOLD_H__
#define __CONSTANT_FOLD_H__
#include "kernel/svm/types.h"
#include "util/types.h"
CCL_NAMESPACE_BEGIN
class Scene;
class ShaderGraph;
class ShaderInput;
class ShaderNode;
class ShaderOutput;
class ConstantFolder {
public:
ShaderGraph *const graph;
ShaderNode *const node;
ShaderOutput *const output;
Scene *scene;
ConstantFolder(ShaderGraph *graph, ShaderNode *node, ShaderOutput *output, Scene *scene);
bool all_inputs_constant() const;
/* Constant folding helpers */
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;
void make_zero() const;
void make_one() 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, bool clamp = false) const;
/* Test if shader inputs of the current nodes have fixed values. */
bool is_zero(ShaderInput *input) const;
bool is_one(ShaderInput *input) const;
/* Specific nodes. */
void fold_mix(NodeMix type, bool clamp) const;
void fold_math(NodeMathType type) const;
void fold_vector_math(NodeVectorMathType type) const;
void fold_mapping(NodeMappingType type) const;
};
CCL_NAMESPACE_END
#endif /* __CONSTANT_FOLD_H__ */
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