/* "esclight.h"
*/


#ifndef __ESCLIGHTHEADER
#define __ESCLIGHTHEADER

#include <libps.h>


typedef struct{
	long int		x, y, z;
	int				length;
}long_vector;

typedef struct{
	int				xPos, yPos, zPos;
	long_vector		normal;
	unsigned char	inherentRed, inherentGreen, inherentBlue;
	unsigned char	screenRed, screenGreen, screenBlue;
}gouraud_vertex;


typedef struct{
	long int		r, g, b;
}colour_vector;


typedef struct{
	long			influence[3];
}light_influence_vector;


struct f_lights{
	GsF_LIGHT		flatLight[3];
	long_vector		invDirection[3];
	int				active[3];
}worldFlatLights;

struct a_light{
	short			red, green, blue;
}worldAmbientLight;


/**************** MACRO Functions *****************/

#define SetLongVector(v, _x, _y, _z) ((v)->x = (_x), \
									  (v)->y = (_y), \
									  (v)->z = (_z))

#define SetVertexColour(v, _r, _g, _b) ((v)->inherentRed = (_r), \
										(v)->inherentGreen = (_g), \
										(v)->inherentBlue = (_b))

/************* End of MACRO Functions *************/

/************** Function Declarations *************/

void InitFlatLights();


void InitAmbientLight();


void SetFlatLight(int id, long int vx, long int vy, long int vz,
						  unsigned char r, unsigned char g, unsigned char b);

						  
void SetAmbientLight(short int red, short int green, short int blue);


void NormaliseLongVector(long_vector* vector);


long CalculateDotProduct(long_vector* vector1, long_vector* vector2);


light_influence_vector* CalculateLightInfluence(long_vector* vector);


colour_vector* CalculateInfluenceColour(light_influence_vector* influence);


void AddAmbientLightToColourVector(colour_vector* vector);


colour_vector* CalculateScreenColours(gouraud_vertex* vertex, colour_vector* influenceColour);


void DoLightCalculation(gouraud_vertex* vertex);


/********** End of Function Declararions *********/


#endif