#ifndef MATH_H
#define MATH_H
+#include <string.h>
+#include <math.h>
+
/* datatypes */
typedef struct s_3dvec {
/* function prototypes */
-int v3_add(t_3dvec *sum,t_3dvec *a,t_3dvec *b);
-int v3_sub(t_3dvec *sum,t_3dvec *a,t_3dvec *b);
-int v3_scale(t_3dvec *result,t_3dvec *a,double s);
-int v3_zero(t_3dvec *vec);
-int v3_set(t_3dvec *vec,double *ptr);
-int v3_copy(t_3dvec *trg,t_3dvec *src);
-int v3_cmp(t_3dvec *a,t_3dvec *b);
+static inline int v3_add(t_3dvec *sum,t_3dvec *a,t_3dvec *b) __attribute__((always_inline));
+static inline int v3_sub(t_3dvec *sum,t_3dvec *a,t_3dvec *b) __attribute__((always_inline));
+static inline int v3_scale(t_3dvec *result,t_3dvec *a,double s) __attribute__((always_inline));
+static inline int v3_zero(t_3dvec *vec) __attribute__((always_inline));
+static inline int v3_set(t_3dvec *vec,double *ptr) __attribute__((always_inline));
+static inline int v3_copy(t_3dvec *trg,t_3dvec *src) __attribute__((always_inline));
+static inline int v3_cmp(t_3dvec *a,t_3dvec *b) __attribute__((always_inline));
+static inline double v3_scalar_product(t_3dvec *a,t_3dvec *b) __attribute__((always_inline));
+static inline double v3_absolute_square(t_3dvec *a) __attribute__((always_inline));
+static inline double v3_norm(t_3dvec *a) __attribute__((always_inline));
+static inline int v3_per_bound(t_3dvec *a,t_3dvec *dim) __attribute__((always_inline));
+
+/* function definitions */
+
+static inline int v3_add(t_3dvec *sum,t_3dvec *a,t_3dvec *b) {
+
+ sum->x=a->x+b->x;
+ sum->y=a->y+b->y;
+ sum->z=a->z+b->z;
+
+ return 0;
+}
+
+static inline int v3_sub(t_3dvec *sum,t_3dvec *a,t_3dvec *b) {
+
+ sum->x=a->x-b->x;
+ sum->y=a->y-b->y;
+ sum->z=a->z-b->z;
+
+ return 0;
+}
+
+static inline int v3_scale(t_3dvec *result,t_3dvec *a,double s) {
+
+ result->x=s*a->x;
+ result->y=s*a->y;
+ result->z=s*a->z;
+
+ return 0;
+}
+
+static inline int v3_zero(t_3dvec *vec) {
+
+ vec->x=.0;
+ vec->y=.0;
+ vec->z=.0;
+
+ return 0;
+}
+
+static inline int v3_set(t_3dvec *vec,double *ptr) {
+
+ memcpy(vec,ptr,sizeof(t_3dvec));
+
+ return 0;
+}
+
+static inline int v3_copy(t_3dvec *trg,t_3dvec *src) {
+
+ //memcpy(trg,src,sizeof(t_3dvec));
+
+ /* faster this way? */
+ trg->x=src->x;
+ trg->y=src->y;
+ trg->z=src->z;
+
+ return 0;
+}
+
+static inline int v3_cmp(t_3dvec *a,t_3dvec *b) {
+
+ return(memcmp(a,b,sizeof(t_3dvec)));
+}
+
+static inline double v3_scalar_product(t_3dvec *a,t_3dvec *b) {
+
+ return(a->x*b->x+a->y*b->y+a->z*b->z);
+}
+
+static double v3_absolute_square(t_3dvec *a) {
+
+ return(a->x*a->x+a->y*a->y+a->z*a->z);
+}
+
+static inline double v3_norm(t_3dvec *a) {
+
+ return(sqrt(a->x*a->x+a->y*a->y+a->z*a->z));
+}
+
+static inline int v3_per_bound(t_3dvec *a,t_3dvec *dim) {
+
+ double x,y,z;
+
+ x=0.5*dim->x;
+ y=0.5*dim->y;
+ z=0.5*dim->z;
+
+ if(a->x>=x) a->x-=dim->x;
+ else if(-a->x>x) a->x+=dim->x;
+ if(a->y>=y) a->y-=dim->y;
+ else if(-a->y>y) a->y+=dim->y;
+ if(a->z>=z) a->z-=dim->z;
+ else if(-a->z>z) a->z+=dim->z;
+
+ return 0;
+}
#endif