#include <u.h>#include <libc.h>#include <draw.h>#include <memdraw.h>#include <geometry.h> #include "scene.h" Colourcsum(Colour a, Colour b){	Colour c; 	c.r = a.r + b.r;	c.g = a.g + b.g;	c.b = a.b + b.b; 	return c;} Colourcscale(Colour a, double b){	Colour c; 	c.r = a.r * b;	c.g = a.g * b;	c.b = a.b * b; 	return c;} Colourcmul(Colour a, Colour b){	Colour c; 	c.r = a.r * b.r;	c.g = a.g * b.g;	c.b = a.b * b.b; 	return c;}