/*
 * DMLib
 * -- Perlin noise functionality
 * Based heavily on original code (C) Copyright Ken Perlin
 * Adapted and enhanced by Matti 'ccr' Hamalainen
 */
#ifndef DMPERLIN_H
#define DMPERLIN_H

#include "dmlib.h"

#ifdef __cplusplus
extern "C" {
#endif


#define DM_PLNS_B       (0x100)
#define DM_PLNS_BM      (0x0ff)
#define DM_PLNS_N       (0x1000)

typedef struct
{
    int p[DM_PLNS_B + DM_PLNS_B + 2];
    DMFloat g2[DM_PLNS_B + DM_PLNS_B + 2][2];
    DMFloat g1[DM_PLNS_B + DM_PLNS_B + 2];
} DMPerlinContext;


int      dmPerlinInit(DMPerlinContext *ctx, const int seed);
DMFloat  dmPerlinNoise2D(const DMPerlinContext *ctx, DMFloat x, DMFloat y, DMFloat alpha, DMFloat beta, int n);


#ifdef __cplusplus
}
#endif

#endif // DMPERLIN_H