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/* RCSid $Id$ */
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/*
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* Color matrix routine declarations.
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*
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* G. Ward
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*/
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#ifndef _RAD_CMATRIX_H_
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#define _RAD_CMATRIX_H_
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#include "color.h"
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#ifdef __cplusplus
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extern "C" {
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#endif
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/* Data types for file loading */
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enum {DTfromHeader, DTascii, DTfloat, DTdouble, DTrgbe, DTxyze};
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/* A color coefficient matrix -- vectors have ncols==1 */
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typedef struct {
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int nrows, ncols;
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COLORV cmem[3]; /* extends struct */
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} CMATRIX;
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#define COLSPEC (sizeof(COLORV)==sizeof(float) ? "%f %f %f" : "%lf %lf %lf")
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#define cm_lval(cm,r,c) ((cm)->cmem + 3*((r)*(cm)->ncols + (c)))
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#define cv_lval(cm,i) ((cm)->cmem + 3*(i))
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/* Allocate a color coefficient matrix */
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extern CMATRIX *cm_alloc(int nrows, int ncols);
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/* Resize color coefficient matrix */
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extern CMATRIX *cm_resize(CMATRIX *cm, int nrows);
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#define cm_free(cm) free(cm)
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/* Load header to obtain data type */
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int getDTfromHeader(FILE *fp);
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/* Allocate and load a matrix from the given file (or stdin if NULL) */
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extern CMATRIX *cm_load(const char *fname, int nrows, int ncols, int dtype);
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/* Extract a column vector from a matrix */
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extern CMATRIX *cm_column(const CMATRIX *cm, int c);
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/* Scale a matrix by a single value */
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extern CMATRIX *cm_scale(const CMATRIX *cm1, const COLOR sca);
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/* Multiply two matrices (or a matrix and a vector) and allocate the result */
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extern CMATRIX *cm_multiply(const CMATRIX *cm1, const CMATRIX *cm2);
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/* print out matrix as ASCII text -- no header */
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extern void cm_print(const CMATRIX *cm, FILE *fp);
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/* Load and convert a matrix BSDF from the given XML file */
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extern CMATRIX *cm_loadBSDF(char *fname, COLOR cLamb);
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#ifdef __cplusplus
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}
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#endif
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#endif /* _RAD_CMATRIX_H_ */
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