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struct light {
enum { Directional, Pointlight, Spot } kind;
union {
struct {
struct point dir;
struct point col;
} directional;
struct {
struct point orig;
struct point col;
} point;
struct {
struct point orig;
struct point at;
struct point col;
flt cutoff, exponent;
struct vector unit;
} spot;
} u;
};
struct light * dirlight(struct point * dir, struct point * c);
struct light * pointlight(struct point * orig, struct point * c);
struct light * spotlight(struct point * pos, struct point * at,
struct point * c, flt a, flt cutoff);
void color_from_lights(struct object * obj,
struct point * p,
struct vector * v,
struct vector * n,
flt kd, flt ks, flt phong,
struct light ** lights,
/*out*/ struct point * il);
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