Local patch parameterization descriptor. More...

#include <patchParam.h>

Inheritance diagram for PatchParam:

Public Member Functions
void	Set (Index faceid, short u, short v, unsigned short depth, bool nonquad, unsigned short boundary, unsigned short transition)
	Sets the values of the bit fields. More...

void	Clear ()
	Resets everything to 0. More...

Index	GetFaceId () const
	Retuns the faceid. More...

unsigned short	GetU () const
	Returns the log2 value of the u parameter at the top left corner of the patch. More...

unsigned short	GetV () const
	Returns the log2 value of the v parameter at the top left corner of the patch. More...

unsigned short	GetTransition () const
	Returns the transition edge encoding for the patch. More...

unsigned short	GetBoundary () const
	Returns the boundary edge encoding for the patch. More...

bool	NonQuadRoot () const
	True if the parent coarse face is a non-quad. More...

float	GetParamFraction () const
	Returns the fraction of normalized parametric space covered by the sub-patch. More...

unsigned short	GetDepth () const
	Returns the level of subdivision of the patch. More...

void	Normalize (float &u, float &v) const

Public Attributes
unsigned int	field0:32

unsigned int	field1:32

Detailed Description

Local patch parameterization descriptor.

Coarse mesh faces are split into sets of patches in both uniform and feature adaptive modes. In order to maintain local patch parameterization, it is necessary to retain some information, such as level of subdivision, face- winding status... This parameterization is directly applicable to ptex textures, but has to be remapped to a specific layout for uv textures.

Bitfield layout :

Field0	Bits	Content
faceId	28	the faceId of the patch
transition	4	transition edge mask encoding

Field1	Bits	Content
level	4	the subdivision level of the patch
nonquad	1	whether the patch is the child of a non-quad face
unused	3	transition edge mask encoding
boundary	4	boundary edge mask encoding
v	10	log2 value of u parameter at first patch corner
u	10	log2 value of v parameter at first patch corner

Note : the bitfield is not expanded in the struct due to differences in how GPU & CPU compilers pack bit-fields and endian-ness.

Definition at line 64 of file patchParam.h.

Member Function Documentation

void Clear ( )

inline

Resets everything to 0.

Definition at line 83 of file patchParam.h.

unsigned short GetBoundary ( ) const

inline

Returns the boundary edge encoding for the patch.

Definition at line 100 of file patchParam.h.

unsigned short GetDepth ( ) const

inline

Returns the level of subdivision of the patch.

Definition at line 110 of file patchParam.h.

Index GetFaceId ( ) const

inline

Retuns the faceid.

Definition at line 86 of file patchParam.h.

float GetParamFraction ( ) const

inline

Returns the fraction of normalized parametric space covered by the sub-patch.

Definition at line 142 of file patchParam.h.

unsigned short GetTransition ( ) const

inline

Returns the transition edge encoding for the patch.

Definition at line 97 of file patchParam.h.

unsigned short GetU ( ) const

inline

Returns the log2 value of the u parameter at the top left corner of the patch.

Definition at line 90 of file patchParam.h.

unsigned short GetV ( ) const

inline

Returns the log2 value of the v parameter at the top left corner of the patch.

Definition at line 94 of file patchParam.h.

bool NonQuadRoot ( ) const

inline

True if the parent coarse face is a non-quad.

Definition at line 103 of file patchParam.h.

void Normalize	(	float &	u,
		float &	v
	)		const

inline

The (u,v) pair is normalized to this sub-parametric space.

Parameters

u	u parameter
v	v parameter

Definition at line 151 of file patchParam.h.

void Set	(	Index	faceid,
		short	u,
		short	v,
		unsigned short	depth,
		bool	nonquad,
		unsigned short	boundary,
		unsigned short	transition
	)

inline

Sets the values of the bit fields.

Parameters

faceid	face index
u	value of the u parameter for the first corner of the face
v	value of the v parameter for the first corner of the face
depth	subdivision level of the patch
nonquad	true if the root face is not a quad
boundary	4-bits identifying boundary edges
transition	4-bits identifying transition edges

Definition at line 129 of file patchParam.h.

Member Data Documentation

unsigned int field0

Definition at line 119 of file patchParam.h.

unsigned int field1

Definition at line 120 of file patchParam.h.

The documentation for this struct was generated from the following file:

opensubdiv/far/patchParam.h

Public Member Functions

Public Attributes

Detailed Description

Member Function Documentation

Member Data Documentation