Separable filter with width=4 support. More...

Inheritance diagram for PtexWidth4Filter:

Public Types
typedef float	KernelFn(float x, const float *c)

Public Types inherited from PtexFilter
enum	FilterType { f_point, f_bilinear, f_box, f_gaussian, f_bicubic, f_bspline, f_catmullrom, f_mitchell }
	Filter types. More...

Public Member Functions
	PtexWidth4Filter (PtexTexture tx, const PtexFilter::Options &opts, KernelFn k, const float c=0)

virtual void	buildKernel (PtexSeparableKernel &k, float u, float v, float uw, float vw, Res faceRes)

Public Member Functions inherited from PtexSeparableFilter
virtual void	release ()
	Release resources held by this pointer (pointer becomes invalid). More...

virtual void	eval (float *result, int firstchan, int nchannels, int faceid, float u, float v, float uw1, float vw1, float uw2, float vw2, float width, float blur)
	Apply filter to a ptex data file. More...

Private Member Functions
float	blur (float x)

void	buildKernelAxis (int8_t &k_ureslog2, int &k_u, int &k_uw, float *ku, float u, float uw, int f_ureslog2)

Private Attributes
KernelFn *	_k

const float *	_c

Additional Inherited Members
Static Public Member Functions inherited from PtexFilter
static PtexFilter *	getFilter (PtexTexture *tx, const Options &opts)

Protected Member Functions inherited from PtexSeparableFilter
	PtexSeparableFilter (PtexTexture *tx, const PtexFilter::Options &opts)

virtual	~PtexSeparableFilter ()

void	splitAndApply (PtexSeparableKernel &k, int faceid, const Ptex::FaceInfo &f)

void	applyAcrossEdge (PtexSeparableKernel &k, int faceid, const Ptex::FaceInfo &f, int eid)

void	applyToCorner (PtexSeparableKernel &k, int faceid, const Ptex::FaceInfo &f, int eid)

void	applyToCornerFace (PtexSeparableKernel &k, const Ptex::FaceInfo &f, int eid, int cfaceid, const Ptex::FaceInfo &cf, int ceid)

void	apply (PtexSeparableKernel &k, int faceid, const Ptex::FaceInfo &f)

Protected Member Functions inherited from PtexFilter
virtual	~PtexFilter ()
	Destructor not for public use. Use release() instead. More...

Protected Attributes inherited from PtexSeparableFilter
PtexTexture *	_tx

Options	_options

float *	_result

float	_weight

int	_firstChanOffset

int	_nchan

int	_ntxchan

DataType	_dt

BorderMode	_uMode

BorderMode	_vMode

EdgeFilterMode	_efm

Detailed Description

Separable filter with width=4 support.

The kernel width is calculated as a multiple of 4 times the filter width and the texture resolution is chosen such that each kernel axis has between 4 and 8.

For kernel widths too large to handle (because the kernel would extend significantly beyond both sides of the face), a special Hermite smoothstep is used to interpolate the two nearest 2 samples along the affected axis (or axes).

Definition at line 116 of file PtexFilters.cpp.