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materialParam.h
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2 // Copyright 2019 Pixar
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24 #ifndef PXR_IMAGING_HD_MATERIAL_PARAM_H
25 #define PXR_IMAGING_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  // Additional primvar needed by material. One that is not connected to
65  // a input parameter (ParamTypePrimvar).
66  ParamTypeAdditionalPrimvar
67  };
68 
69  HD_API
70  HdMaterialParam();
71 
72  HD_API
73  HdMaterialParam(ParamType paramType,
74  TfToken const& name,
75  VtValue const& fallbackValue,
76  SdfPath const& connection=SdfPath(),
77  TfTokenVector const& samplerCoords=TfTokenVector(),
78  HdTextureType textureType = HdTextureType::Uv);
79 
80  HD_API
81  ~HdMaterialParam();
82 
85  HD_API
86  static ID ComputeHash(HdMaterialParamVector const &shaders);
87 
88  HD_API
89  HdTupleType GetTupleType() const;
90 
91  bool IsField() const {
92  return paramType == ParamTypeField;
93  }
94  bool IsTexture() const {
95  return paramType == ParamTypeTexture;
96  }
97  bool IsPrimvar() const {
98  return paramType == ParamTypePrimvar;
99  }
100  bool IsFallback() const {
101  return paramType == ParamTypeFallback;
102  }
103  bool IsFieldRedirect() const {
104  return paramType == ParamTypeFieldRedirect;
105  }
106  bool IsAdditionalPrimvar() const {
107  return paramType == ParamTypeAdditionalPrimvar;
108  }
109 
110  ParamType paramType;
111  TfToken name;
112  VtValue fallbackValue;
113  SdfPath connection;
114  TfTokenVector samplerCoords;
115  HdTextureType textureType;
116 };
117 
118 
119 PXR_NAMESPACE_CLOSE_SCOPE
120 
121 #endif //PXR_IMAGING_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:433
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