mesh.h

//
// Copyright 2016 Pixar
//
// Licensed under the terms set forth in the LICENSE.txt file available at
// https://openusd.org/license.
//
#ifndef PXR_IMAGING_HD_MESH_H
#define PXR_IMAGING_HD_MESH_H
 
#include "pxr/pxr.h"
#include "pxr/imaging/hd/api.h"
#include "pxr/imaging/hd/version.h"
#include "pxr/imaging/hd/enums.h"
#include "pxr/imaging/hd/meshTopology.h"
#include "pxr/imaging/hd/rprim.h"
#include "pxr/imaging/hd/tokens.h"
#include "pxr/imaging/pxOsd/subdivTags.h"
 
PXR_NAMESPACE_OPEN_SCOPE
 
#define HD_MESH_REPR_DESC_TOKENS \
    (surfaceShader)              \
    (surfaceShaderUnlit)         \
    (surfaceShaderSheer)         \
    (surfaceShaderOutline)       \
    (constantColor)              \
    (hullColor)                  \
    (pointColor)
 
TF_DECLARE_PUBLIC_TOKENS(HdMeshReprDescTokens, HD_API,
        HD_MESH_REPR_DESC_TOKENS);
 
struct HdMeshReprDesc
{
    HdMeshReprDesc(HdMeshGeomStyle geomStyle = HdMeshGeomStyleInvalid,
                   HdCullStyle cullStyle = HdCullStyleDontCare,
                   TfToken shadingTerminal = HdMeshReprDescTokens->surfaceShader,
                   bool flatShadingEnabled = false,
                   bool blendWireframeColor = true,
                   bool forceOpaqueEdges = true,
                   bool doubleSided = false,
                   float lineWidth = 0,
                   bool useCustomDisplacement = true,
                   bool enableScalarOverride = true)
        : geomStyle(geomStyle)
        , cullStyle(cullStyle)
        , shadingTerminal(shadingTerminal)
        , flatShadingEnabled(flatShadingEnabled)
        , blendWireframeColor(blendWireframeColor)
        , forceOpaqueEdges(forceOpaqueEdges)
        , doubleSided(doubleSided)
        , lineWidth(lineWidth)
        , useCustomDisplacement(useCustomDisplacement)
        , enableScalarOverride(enableScalarOverride)
        {}
    
    bool IsEmpty() const {
        return geomStyle == HdMeshGeomStyleInvalid;
    }
 
    HdMeshGeomStyle geomStyle;
    HdCullStyle     cullStyle;
    TfToken         shadingTerminal;
    bool            flatShadingEnabled;
    bool            blendWireframeColor;
    bool            forceOpaqueEdges;
    bool            doubleSided;
    float           lineWidth;
    bool            useCustomDisplacement;
    bool            enableScalarOverride;
};
 
class HdMesh : public HdRprim
{
public:
    HD_API
    ~HdMesh() override;
 
    inline bool        IsDoubleSided(HdSceneDelegate* delegate) const;
    inline HdCullStyle GetCullStyle(HdSceneDelegate* delegate)  const;
    inline VtValue     GetShadingStyle(HdSceneDelegate* delegate)  const;
 
    inline HdMeshTopology  GetMeshTopology(HdSceneDelegate* delegate) const;
    inline HdDisplayStyle  GetDisplayStyle(HdSceneDelegate* delegate)  const;
    inline PxOsdSubdivTags GetSubdivTags(HdSceneDelegate* delegate)   const;
 
    virtual HdMeshTopologySharedPtr  GetTopology() const;
 
    inline VtValue GetPoints(HdSceneDelegate* delegate)  const;
    inline VtValue GetNormals(HdSceneDelegate* delegate) const;
 
    HD_API
    TfTokenVector const & GetBuiltinPrimvarNames() const override;
 
    HD_API
    static void ConfigureRepr(TfToken const &reprName,
                              HdMeshReprDesc desc1,
                              HdMeshReprDesc desc2=HdMeshReprDesc());
 
protected:
    HD_API
    HdMesh(SdfPath const& id);
 
    // We allow up to 2 repr descs per repr for meshes (see ConfigureRepr above)
    using _MeshReprConfig = _ReprDescConfigs<HdMeshReprDesc, 2>;
 
    HD_API
    static _MeshReprConfig::DescArray _GetReprDesc(TfToken const &reprName);
 
private:
 
    // Class can not be default constructed or copied.
    HdMesh()                           = delete;
    HdMesh(const HdMesh &)             = delete;
    HdMesh &operator =(const HdMesh &) = delete;
 
    static _MeshReprConfig _reprDescConfig;
};
 
inline bool
HdMesh::IsDoubleSided(HdSceneDelegate* delegate) const
{
    return delegate->GetDoubleSided(GetId());
}
 
inline HdCullStyle
HdMesh::GetCullStyle(HdSceneDelegate* delegate) const
{
    return delegate->GetCullStyle(GetId());
}
 
inline VtValue
HdMesh::GetShadingStyle(HdSceneDelegate* delegate) const
{
    return delegate->GetShadingStyle(GetId());
}
 
inline HdMeshTopology
HdMesh::GetMeshTopology(HdSceneDelegate* delegate) const
{
    return delegate->GetMeshTopology(GetId());
}
 
inline HdDisplayStyle
HdMesh::GetDisplayStyle(HdSceneDelegate* delegate) const
{
    return delegate->GetDisplayStyle(GetId());
}
 
inline PxOsdSubdivTags
HdMesh::GetSubdivTags(HdSceneDelegate* delegate) const
{
    return delegate->GetSubdivTags(GetId());
}
 
inline HdMeshTopologySharedPtr
HdMesh::GetTopology() const
{
    return HdMeshTopologySharedPtr();
}
 
inline VtValue
HdMesh::GetPoints(HdSceneDelegate* delegate) const
{
    return GetPrimvar(delegate, HdTokens->points);
}
 
inline VtValue
HdMesh::GetNormals(HdSceneDelegate* delegate) const
{
    return GetPrimvar(delegate, HdTokens->normals);
}
 
 
PXR_NAMESPACE_CLOSE_SCOPE
 
#endif //PXR_IMAGING_HD_MESH_H