pfPolyScalar(3pf) OpenGL Performer 3.2.2 libpf C Reference Pages
NAME
pfNewPolyScalar, pfGetPolyScalarClassType, pfPolyScalarEval - A
polynomial function
FUNCTION SPECIFICATION
#include <Performer/pf.h>
pfPolyScalar * pfNewPolyScalar(void *arena);
pfType * pfGetPolyScalarClassType(void);
pfReal pfPolyScalarEval(pfScalar *s, pfReal u);
PARENT CLASS FUNCTIONS
The OpenGL Performer class pfPolyScalar is derived from the parent class
pfScalar, so each of these member functions of class pfScalar are also
directly usable with objects of class pfPolyScalar. Casting an object of
class pfPolyScalar to an object of class pfScalar is taken care of
automatically. This is also true for casts to objects of ancestor
classes of class pfScalar.
Since the class pfScalar is itself derived from the parent class
pfObject, objects of class pfPolyScalar can also be used with these
functions designed for objects of class pfObject.
void pfUserDataSlot(pfObject *obj, int slot, void *data);
void pfUserData(pfObject *obj, void *data);
void* pfGetUserDataSlot(pfObject *obj, int slot);
void* pfGetUserData(pfObject *obj);
int pfGetNumUserData(pfObject *obj);
int pfGetNamedUserDataSlot(const char *name);
const char* pfGetUserDataSlotName(int slot);
int pfGetNumNamedUserDataSlots(void);
int pfDeleteGLHandle(pfObject *obj);
Since the class pfObject is itself derived from the parent class
pfMemory, objects of class pfPolyScalar can also be used with these
functions designed for objects of class pfMemory.
pfType * pfGetType(const void *ptr);
int pfIsOfType(const void *ptr, pfType *type);
int pfIsExactType(const void *ptr, pfType *type);
const char * pfGetTypeName(const void *ptr);
int pfRef(void *ptr);
int pfUnref(void *ptr);
int pfUnrefDelete(void *ptr);
int pfUnrefGetRef(void *ptr);
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pfPolyScalar(3pf) OpenGL Performer 3.2.2 libpf C Reference Pages
int pfGetRef(const void *ptr);
int pfCopy(void *dst, void *src);
int pfDelete(void *ptr);
int pfIsFluxed(void *ptr);
int pfCompare(const void *ptr1, const void *ptr2);
void pfPrint(const void *ptr, uint which, uint verbose,
FILE *file);
void * pfGetArena(void *ptr);
DESCRIPTION
pfPolyScalar defines a polynomial function:
s = a[0] + a[1]*u + a[2]*u^2 + ... a[n]*u^n
where n is the degree of the polynomial and a[i]'s are the coefficients.
pfNewPolyScalar creates and returns a handle to a pfPolyScalar. arena
specifies a malloc arena out of which the pfPolyScalar is allocated or
NULL for allocation off the process heap. pfPolyScalars can be deleted
with pfDelete.
pfGetPolyScalarClassType returns the pfType* for the class pfPolyScalar.
the pfType* returned by pfGetPolyScalarClassType is the same as the
pfType* returned by invoking pfGetType on any instance of class
pfPolyScalar. Because OpenGL Performer allows subclassing of built-in
types, when decisions are made based on the type of an object, it is
usually better to use pfIsOfType to test if an object is of a type
derived from a Performer type rather than to test for strict equality of
the pfType*'s.
pfNewPolyScalar creates an instance of pfPolyScalar. No valid data is
set.
pfPolyScalarSet sets the degree and the polynomia where degree is the
degree of the polynomial and coef are the coefficients of the polynomial.
The polynomial is defined as:
coef[0] + coef[1]*u + coef[2]*u^2 + ...
pfGetPolyScalarDegree returns the degree of the polynomial.
pfGetPolyScalarCoef returns the i'th coefficient of the polynomial.
pfPolyScalarEval returns the value of the polynomial at u
SEE ALSO
pfObject, pfScalar
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