/* coefficients.h: macro's to manipulate radiance coefficients. */

#ifndef _COEFFICIENTS_H_
#define _COEFFICIENTS_H_

#ifdef __cplusplus
extern "C" {
#endif

#include "color.h"

#define CLEARCOEFFICIENTS(c, basis) {int _i, _n=basis->size; COLOR *_c;	\
  for (_i=0, _c=(c); _i<_n; _i++, _c++) COLORCLEAR(*_c);		\
}

#define COPYCOEFFICIENTS(dst, src, basis) {int _i, _n=basis->size; COLOR *_d, *_s; \
  for (_i=0, _d=(dst), _s=(src); _i<_n; _i++, _d++, _s++) *_d=*_s;	\
}

#define ADDCOEFFICIENTS(dst, extra, basis) {int _i, _n=basis->size; COLOR *_d, *_s; \
  for (_i=0, _d=(dst), _s=(extra); _i<_n; _i++, _d++, _s++) {		\
    COLORADD(*_d, *_s, *_d);						\
}}

#define SCALECOEFFICIENTS(scale, color, basis) {int _i, _n=basis->size; COLOR *_d; float _scale=(scale); \
  for (_i=0, _d=(color); _i<_n; _i++, _d++) {				\
    COLORSCALE(_scale, *_d, *_d);						\
}}

#define MULTCOEFFICIENTS(color, coeff, basis) {int _i, _n=basis->size; COLOR *_d; COLOR _col = (color); \
  for (_i=0, _d=(coeff); _i<_n; _i++, _d++) { \
    COLORPROD(_col, *_d, *_d); \
}}

#define PRINTCOEFFICIENTS(fp, c, basis) {int _i, _n=basis->size; 		\
  if (_n>0) ColorPrint(fp, (c)[0]);					\
  for (_i=1; _i<_n; _i++) {						\
    fprintf(fp, ", ");							\
    ColorPrint(fp, (c)[_i]); 						\
  }}

/* basically sets rad...  to NULL */
extern void InitCoefficients(ELEMENT *elem);

/* disposes previously allocated coefficients */
extern void DisposeCoefficients(ELEMENT *elem);

/* allocates memory for radiance coefficients */
extern void AllocCoefficients(ELEMENT *elem);

/* re-allocates memory for radiance coefficients if
 * the currently desired approximation order is not the same
 * as the approximation order for which the element has
 * been initialised before. */
extern void ReAllocCoefficients(ELEMENT *elem);

#ifdef __cplusplus
}
#endif

#endif /*_COEFFICIENTS_H_*/