/*
 * read_texture() - read in an image file in SGI 'libimage' format
 * 	currently its very simple minded and converts all images
 *      to RGBA8 regardless of the input format and returns the
 *	original number of components in the appropriate parameter.
 *     
 *	the components are converted as follows
 *		L    -> LLL 1.0
 *		LA   -> LLL A
 *		RGB  -> RGB 1.0
 *		RGBA -> RGB A
 */
unsigned *read_texture(const char *name,
	int *width,int *height,int *components);