#include <stdint.h>

// Useful structures
typedef struct
{
	int x;
	int y;
} ScreenPoint;

typedef struct
{
	float x;
	float y;
} Vector;

// Map-related functions and defines
#define POINT_OUT_MAP -1
extern uint16_t* nRC_loadBMP(char *path);

extern int nRC_getTile(int *map, ScreenPoint point, ScreenPoint mapDimensions);

extern int getTileFront(Vector pos, Vector dir, float speed, int *map, ScreenPoint mapDim);
extern int getTileBehind(Vector pos, Vector dir, float speed, int *map, ScreenPoint mapDim);

// Various macros

#define abs(x) (x < 0 ? -x : x)
#define map(x, in_min, in_max, out_min, out_max) ((x - in_min) * (out_max - out_min) / (in_max - in_min) + out_min)

#define nRC_248mul(a,b) ((a*b) >> 8)
#define nRC_248div(a,b) ((a << 8) / b)

#define DEG2RAD(x) ((float)(x) * M_PI / 180)
#define RAD2DEG(x) ((float)(x) * 180 / M_PI)

// Edit them to fit your textures, which must be squares
#define TEXTUREW 64
#define TEXTUREH TEXTUREW

#define R5G6B5(r,g,b) ((r << 11) | (g << 5) | b)
extern void nRC_setPixel(ScreenPoint pixel, int color, char* buffer);

#define nRC_drawHorizontalLine(origin, end, constant, color, buffer) nRC_drawLineShared(origin, end, constant, color, buffer, 0)
#define nRC_drawVerticalLine(origin, end, constant, color, buffer) nRC_drawLineShared(origin, end, constant, color, buffer, 1)
void nRC_drawLineShared(int origin, int end, int constant, int color, char *buffer, int side);
extern void nRC_drawLine(ScreenPoint pt1, ScreenPoint pt2, int color, char *buffer);

extern void nRC_fillTriangle(ScreenPoint pt1, ScreenPoint pt2, ScreenPoint pt3, int color, char *buffer);

extern inline void nRC_clearBuf(char *buffer, int w);
extern inline void nRC_dispBuf(char *buffer);

extern void nRC_rayCasting(int *map, Vector player, ScreenPoint mapDimensions, Vector dir, Vector planeVec, uint16_t *textures, char *buffer);

extern void nRC_moveForward(Vector *pos, Vector *dir, Vector *plane, float speed, int *map, ScreenPoint mapDim);
extern void nRC_moveBackward(Vector *pos, Vector *dir, Vector *plane, float speed, int *map, ScreenPoint mapDim);

extern void nRC_lookLeft(Vector *dir, Vector *plane, float speed);
extern void nRC_lookRight(Vector *dir, Vector *plane, float speed);