#ifndef prbm_h
#define prbm_h

#include "types.h"

struct v2 {
	f32 x;
	f32 y;
};

struct v3 {
	f32 x;
	f32 y;
	f32 z;
};

struct v4 {
	f32 x;
	f32 y;
	f32 z;
	f32 w;
};

// column-major
struct mat {
	struct v4 c0;
	struct v4 c1;
	struct v4 c2;
	struct v4 c3;
};

struct rect {
	struct v2 start;
	struct v2 end;
};

#define v2_zero		(struct v2){ 0.0f,  0.0f}
#define v2_one		(struct v2){ 1.0f,  1.0f}
#define v2_right	(struct v2){ 1.0f,  0.0f}
#define v2_up		(struct v2){ 0.0f,  1.0f}
#define v2_left		(struct v2){-1.0f,  0.0f}
#define v2_down		(struct v2){ 0.0f, -1.0f}

#define v3_zero		(struct v3){ 0.0f,  0.0f,  0.0f}
#define v3_one		(struct v3){ 1.0f,  1.0f,  1.0f}
#define v3_right	(struct v3){ 1.0f,  0.0f,  0.0f}
#define v3_up		(struct v3){ 0.0f,  1.0f,  0.0f}
#define v3_left		(struct v3){-1.0f,  0.0f,  0.0f}
#define v3_down		(struct v3){ 0.0f, -1.0f,  0.0f}
#define v3_forward	(struct v3){ 0.0f,  0.0f,  1.0f}
#define v3_backward	(struct v3){ 0.0f,  0.0f, -1.0f}

#define v4_zero		(struct v4){0.0f, 0.0f, 0.0f, 0.0f}
#define v4_one		(struct v4){1.0f, 1.0f, 1.0f, 1.0f}

#define mat_identity	(struct mat){ \
			{1.0f, 0.0f, 0.0f, 0.0f}, \
			{0.0f, 1.0f, 0.0f, 0.0f}, \
			{0.0f, 0.0f, 1.0f, 0.0f}, \
			{0.0f, 0.0f, 0.0f, 1.0f}}

#define f32pi 3.14159265359f

#define deg2rad(angle)	(f32pi/180.0f*(angle))

struct v2 fillv2(f32 a);
struct v2 invv2(struct v2 a);
struct v2 addv2(struct v2 a, struct v2 b);
struct v2 subv2(struct v2 a, struct v2 b);
struct v2 scalev2(struct v2 a, f32 s);
struct v2 scalevv2(struct v2 a, struct v2 s);
f32 dotv2(struct v2 a, struct v2 b);
f32 len2v2(struct v2 a);
f32 lenv2(struct v2 a);
struct v2 normv2(struct v2 a);

struct v3 fillv3(f32 a);
struct v3 invv3(struct v3 a);
struct v3 addv3(struct v3 a, struct v3 b);
struct v3 subv3(struct v3 a, struct v3 b);
struct v3 scalev3(struct v3 a, f32 s);
struct v3 scalevv3(struct v3 a, struct v3 s);
f32 dotv3(struct v3 a, struct v3 b);
struct v3 crossv3(struct v3 l, struct v3 r);
f32 len2v3(struct v3 a);
f32 lenv3(struct v3 a);
struct v3 normv3(struct v3 a);

struct v4 fillv4(f32 a);
struct v4 invv4(struct v4 a);
struct v4 addv4(struct v4 a, struct v4 b);
struct v4 subv4(struct v4 a, struct v4 b);
struct v4 scalev4(struct v4 a, f32 s);
struct v4 scalevv4(struct v4 a, struct v4 s);
f32 dotv4(struct v4 a, struct v4 b);
f32 len2v4(struct v4 a);
f32 lenv4(struct v4 a);
struct v4 normv4(struct v4 a);

struct mat transpmat(struct mat m);
struct mat mulmat(struct mat left, struct mat right);
struct mat make_translate(struct v3 v);
struct mat make_scale(struct v3 v);
struct mat make_rotate(struct v3 x, struct v3 y, struct v3 z);
struct mat translate_mat(struct mat m, struct v3 v);
struct mat scale_mat(struct mat m, struct v3 v);
struct mat rotate_mat(struct mat m, struct v3 angles);
struct v4 mulmatv4(struct mat m, struct v4 v);

i32 in_rect(struct v2 pos, struct rect rect);

#endif