226  * pixmap for image texture

   227  */

   228 class Pixmap

   229 {

   230 	Colour *data;

   231 	int w,h;

   232 public:

   233 	Pixmap(): data(NULL), w(0), h(0) {};

   234 	Pixmap(Float *adata, int aw, int ah):

   235 		data((Colour*)(adata)), w(aw), h(ah) {};

   236 	void setData(Float *adata, int aw, int ah)

   237 		{ data = (Colour*)adata; w = aw; h = ah; };

   238 	Colour get(int x, int y) { return data[y*w + x]; };

   239 	int getWidth() { return w; };

   240 	int getHeight() { return h; };

   241 };

   242 

   243 /**

   244  * 2D image texture

   245  */

   246 class ImageTexture: public Texture2D

   247 {

   248 	Pixmap *pixmap;

   249 public:

   250 	ImageTexture(TextureMap *tmap, Pixmap *image):

   251 		Texture2D(tmap), pixmap(image) {};

   252 	Colour evaluate(const Vector3 &point)

   253 	{

   254 		Float u,v;

   255 		map->map(point, u,v);

   256 		u = u - 0.5;

   257 		u -= floor(u);

   258 		v = -(v - 0.5);

   259 		v -= floor(v);

   260 		return pixmap->get(u*pixmap->getWidth(), v*pixmap->getHeight());

   261 	};

   262 };

   263 

   264 /**