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materialParam.h
1 //
2 // Copyright 2019 Pixar
3 //
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5 // with the following modification; you may not use this file except in
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24 #ifndef HD_MATERIAL_PARAM_H
25 #define HD_MATERIAL_PARAM_H
26 
27 #include "pxr/pxr.h"
28 #include "pxr/imaging/hd/api.h"
29 #include "pxr/imaging/hd/enums.h"
30 #include "pxr/imaging/hd/version.h"
31 #include "pxr/imaging/hd/types.h"
32 #include "pxr/usd/sdf/path.h"
33 #include "pxr/base/vt/value.h"
34 
35 #include "pxr/base/tf/token.h"
36 
37 #include <string>
38 #include <vector>
39 
40 PXR_NAMESPACE_OPEN_SCOPE
41 
42 
43 typedef std::vector<class HdMaterialParam> HdMaterialParamVector;
44 
45 // XXX: Docs
46 class HdMaterialParam {
47 public:
48  typedef size_t ID;
49 
50  // Indicates the kind of material parameter.
51  enum ParamType {
52  // This is a shader specified fallback value that is
53  // not connected to either a primvar or texture.
54  ParamTypeFallback,
55  // This is a parameter that is connected to a primvar.
56  ParamTypePrimvar,
57  // This is a parameter that is connected to a texture.
58  ParamTypeTexture,
59  // This is a parameter that is connected to a field reader.
60  ParamTypeField,
61  // Accesses 3d texture with potential transform and fallback under
62  // different name
63  ParamTypeFieldRedirect
64  };
65 
66  HD_API
67  HdMaterialParam(ParamType paramType,
68  TfToken const& name,
69  VtValue const& fallbackValue,
70  SdfPath const& connection=SdfPath(),
71  TfTokenVector const& samplerCoords=TfTokenVector(),
72  HdTextureType textureType = HdTextureType::Uv);
73 
74  HD_API
75  ~HdMaterialParam();
76 
79  HD_API
80  static ID ComputeHash(HdMaterialParamVector const &shaders);
81 
82  HD_API
83  HdTupleType GetTupleType() const;
84 
85  bool IsField() const {
86  return paramType == ParamTypeField;
87  }
88  bool IsTexture() const {
89  return paramType == ParamTypeTexture;
90  }
91  bool IsPrimvar() const {
92  return paramType == ParamTypePrimvar;
93  }
94  bool IsFallback() const {
95  return paramType == ParamTypeFallback;
96  }
97  bool IsFieldRedirect() const {
98  return paramType == ParamTypeFieldRedirect;
99  }
100 
101  ParamType paramType;
102  TfToken name;
103  VtValue fallbackValue;
104  SdfPath connection;
105  TfTokenVector samplerCoords;
106  HdTextureType textureType;
107 };
108 
109 
110 PXR_NAMESPACE_CLOSE_SCOPE
111 
112 #endif //HD_MATERIAL_PARAM_H
HdTupleType represents zero, one, or more values of the same HdType.
Definition: types.h:239
Token for efficient comparison, assignment, and hashing of known strings.
Definition: token.h:89
std::vector< TfToken > TfTokenVector
Convenience types.
Definition: token.h:438
A path value used to locate objects in layers or scenegraphs.
Definition: path.h:287
Provides a container which may hold any type, and provides introspection and iteration over array typ...
Definition: value.h:182