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#ifndef USEFUL_H 
#define USEFUL_H 
 
 
#ifndef PI 
#define PI 3.1415926535 
#endif PI 
 
#define COMP 128 // This is used for scaling the terrain coordinates. 
#define SHIFT 7 // This is the same, but can be used on binary shift operations(optimization). 
 
#define M_SIZE 256 // The maximum map size. 
#define IX(x, z) (((x)&255) + (((z)&255) << 8)) // A method of converting a 2D coordinate to 1D. 
 
typedef struct COLOUR  
{ 
	int r,g,b; 
} COLOUR; 
 
#endif USEFUL_H