GeometryScope.h

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//-*****************************************************************************
//
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//-*****************************************************************************

#ifndef Alembic_AbcGeom_GeometryScope_h
#define Alembic_AbcGeom_GeometryScope_h

#include <Alembic/Util/Export.h>
#include <Alembic/AbcGeom/Foundation.h>

namespace Alembic {
namespace AbcGeom {
namespace ALEMBIC_VERSION_NS {

//-*****************************************************************************
//! "GeometryScope" is the name we use for what is called Primitive Variable
//! Class in the Renderman Interface. "Primitive Variable Class" is a bit
//! non-descriptive in a geometry caching context, so we use the somewhat
//! more meaningful (but still admittedly vague) "GeometryScope".
//! Below is a table reproduced from PRMan Application Note #22
//! describing what each of these labels means for different types
//! of geometry.
//-*****************************************************************************

//-*****************************************************************************
//! From Prman Application Note #22 (and Prman Application Note #19)
//! For every geometric prim, there is 1 value for "constant" geometry scope.
//! To save space in my little table here, I'll leave out the "constant" column
//! but just imagine it with a big happy column of '1's.
//!
//!-----------------------------------------------------------------------------
//! QUADRIC & POLYGON SURFACE PRIMITIVES                                       |
//! Surface Primitive     | Uniform | Varying | Vertex  | Facevarying          |
//!-----------------------|---------|---------|---------|----------------------|
//! Quadrics              | 1       | 4       | 4       | 4                    |
//! Polygon               | 1       | nverts  | nverts  | nverts               |
//! GeneralPolygon        | 1       | nverts  | nverts  | nverts               |
//! PointsPolygons        | npolys  | nverts  | nverts  | sum(nvertices_i)     |
//! PointsGeneralPolygons | npolys  | nverts  | nverts  | sum(nvertices_i)     |
//! Points                | 1       | npoints | npoints | npoints              |
//! SubdivisionMesh       | nfaces  | nverts  | nverts  | sum(nvertices_i)     |
//!-----------------------------------------------------------------------------
//!
//!-----------------------------------------------------------------------------
//! PARAMETRIC SURFACE PRIMITIVES                                              |
//! Surface Primitive  | Uniform         | Varying and      | Vertex           |
//!                    |                 |  Facevarying     |                  |
//!--------------------|-----------------|------------------|------------------|
//! Patch bilinear     | 1               | 4                | 4                |
//! Patch bicubic      | 1               | 4                | 16               |
//! PatchMesh bilinear | (nu-unowrap)*   | nu*nv            | nu*nv            |
//!                    |   (nv-vnowrap)  |                  |                  |
//! PatchMesh bicubic  | usegs * vsegs   | (usegs+unowrap)* | nu*nv            |
//!                    |                 |  (vsegs+vnowrap) |                  |
//! NuPatch            | (nu-uorder+1)*  | (nu-uorder+2)*   | nu*nv            |
//!                    |   (nv-vorder+1) |  (nv-vorder+2)   |                  |
//! Curves linear      | ncurves         | sum(nvertices_i) | sum(nvertices_i) |
//! Curves cubic       | ncurves         | sum(nsegs_i      | sum(nvertices_i) |
//!                    |                 |     +nowrap)     |                  |
//! Blobby             |  1              | nleaf            | nleaf            |
//!-----------------------------------------------------------------------------

//-*****************************************************************************
enum GeometryScope
{
    kConstantScope = 0,
    kUniformScope = 1,
    kVaryingScope = 2,
    kVertexScope = 3,
    kFacevaryingScope = 4,

    kUnknownScope = 127
};

//-*****************************************************************************
//! These functions will set or get the GeometryScope out of
//! an object, by looking at its metadata.
//-*****************************************************************************

//-*****************************************************************************
inline void SetGeometryScope( AbcA::MetaData &ioMetaData, GeometryScope iScope )
{
    switch ( iScope )
    {
    case kConstantScope: ioMetaData.set( "geoScope", "con" ); return;
    case kUniformScope: ioMetaData.set( "geoScope", "uni" ); return;
    case kVaryingScope: ioMetaData.set( "geoScope", "var" ); return;
    case kVertexScope: ioMetaData.set( "geoScope", "vtx" ); return;
    case kFacevaryingScope: ioMetaData.set( "geoScope", "fvr" ); return;
    case kUnknownScope: return;
    default: return;
    }
}

//-*****************************************************************************
inline GeometryScope GetGeometryScope( const AbcA::MetaData &iMetaData )
{
    const std::string val = iMetaData.get( "geoScope" );
    if ( val == "con" || val == "" ) { return kConstantScope; }
    else if ( val == "uni" ) { return kUniformScope; }
    else if ( val == "var" ) { return kVaryingScope; }
    else if ( val == "vtx" ) { return kVertexScope; }
    else if ( val == "fvr" ) { return kFacevaryingScope; }
    else { return kUnknownScope; }
}

//-*****************************************************************************
//! These functions below are just implementations of the statements
//! in the table above.
//-*****************************************************************************

//! Works for any quadric.
//! ....
ALEMBIC_EXPORT size_t 
GeometryScopeNumValuesQuadrics( GeometryScope iScope );

//! Works for GeneralPolygon & Polygon
//! ...
ALEMBIC_EXPORT size_t 
GeometryScopeNumValuesPolygon( GeometryScope iScope, size_t iNumVerts );

//! Works for PointsPolygons & PointsGeneralPolygons
//! ...
ALEMBIC_EXPORT size_t 
GeometryScopeNumValuesPointsPolygons( GeometryScope iScope,
                                      size_t iNumPolys,
                                      size_t iNumVerts,
                                      size_t iSumOfCounts );

//! Works for Points
//! ...
ALEMBIC_EXPORT size_t 
GeometryScopeNumValuesPoints( GeometryScope iScope,
                              size_t iNumPoints );

//! Works for Subds, but not hierarchical.
//! ...
ALEMBIC_EXPORT size_t 
GeometryScopeNumValuesSubdivisionMesh( GeometryScope iScope,
                                       size_t iNumFaces,
                                       size_t iNumVerts,
                                       size_t iSumOfCounts );

//! Works for Bilinear Patch
//! ...
ALEMBIC_EXPORT size_t 
GeometryScopeNumValuesBilinearPatch( GeometryScope iScope );

//! Works for Bicubic Patch
//! ...
ALEMBIC_EXPORT size_t 
GeometryScopeNumValuesBicubicPatch( GeometryScope iScope );

//! Works for BilinearPatchMesh
//! ...
ALEMBIC_EXPORT size_t 
GeometryScopeNumValuesBilinearPatchMesh( GeometryScope iScope,
                                         size_t iNu, bool iUNoWrap,
                                         size_t iNv, bool iVNoWrap );

//! Works for BicubicPatchMesh
//! Usegs = Nu-3.
//! Vsegs = Nv-3.
ALEMBIC_EXPORT size_t 
GeometryScopeNumValuesBicubicPatchMesh( GeometryScope iScope,
                                        size_t iNu, bool iUNoWrap,
                                        size_t iNv, bool iVNoWrap );

//! Works for Nurbs patch
//! ...
ALEMBIC_EXPORT size_t 
GeometryScopeNumValuesNuPatch( GeometryScope iScope,
                               size_t iNu, size_t iUorder,
                               size_t iNv, size_t iVorder );

//! Works for Linear Curves
//! ...
ALEMBIC_EXPORT size_t 
GeometryScopeNumValuesLinearCurves( GeometryScope iScope,
                                    size_t iNumCurves, bool iNoWrap,
                                    size_t iSumOfCounts );
//! Works for Bicubic Curves
//! ...
ALEMBIC_EXPORT size_t 
GeometryScopeNumValuesCubicCurves( GeometryScope iScope,
                                   size_t iNumCurves, bool iNoWrap,
                                   size_t iSumOfCounts );

//-*****************************************************************************
//! These functions below are convenience functions for identifying UVs.
//! ...
//-*****************************************************************************

ALEMBIC_EXPORT void SetIsUV( AbcA::MetaData &ioMetaData, bool isUV );

ALEMBIC_EXPORT bool isUV( const AbcA::PropertyHeader & iHeader );

} // End namespace ALEMBIC_VERSION_NS

using namespace ALEMBIC_VERSION_NS;

} // End namespace AbcGeom
} // End namespace Alembic



#endif