Bonjour,

J'ouvre ce post, parce que depuis hier je cherche en vain un code source du bruit de perlin en C compilable sans succés, les seules versions trouvées sont en C++ et je ne connais pas du tout ce langage.
Au pire quelqu'un pourrait'il me convertir ce code C++ vers du C ce serait vraiment sympa.... c'est pas trés long ^^

Code : Sélectionner tout - Visualiser dans une fenêtre à part
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struct perlin
{
    int p[512];
    perlin(void);
    static perlin & getInstance(){static perlin instance; return instance;}
};
 
static int permutation[] = { 151,160,137,91,90,15,
   131,13,201,95,96,53,194,233,7,225,140,36,103,30,69,142,8,99,37,240,21,10,23,
   190, 6,148,247,120,234,75,0,26,197,62,94,252,219,203,117,35,11,32,57,177,33,
   88,237,149,56,87,174,20,125,136,171,168, 68,175,74,165,71,134,139,48,27,166,
   77,146,158,231,83,111,229,122,60,211,133,230,220,105,92,41,55,46,245,40,244,
   102,143,54, 65,25,63,161, 1,216,80,73,209,76,132,187,208, 89,18,169,200,196,
   135,130,116,188,159,86,164,100,109,198,173,186, 3,64,52,217,226,250,124,123,
   5,202,38,147,118,126,255,82,85,212,207,206,59,227,47,16,58,17,182,189,28,42,
   223,183,170,213,119,248,152, 2,44,154,163, 70,221,153,101,155,167, 43,172,9,
   129,22,39,253, 19,98,108,110,79,113,224,232,178,185, 112,104,218,246,97,228,
   251,34,242,193,238,210,144,12,191,179,162,241, 81,51,145,235,249,14,239,107,
   49,192,214, 31,181,199,106,157,184, 84,204,176,115,121,50,45,127, 4,150,254,
   138,236,205,93,222,114,67,29,24,72,243,141,128,195,78,66,215,61,156,180
   };
 
static double fade(double t)
{
    return t * t * t * (t * (t * 6 - 15) + 10);
}
static double lerp(double t, double a, double b) {
    return a + t * (b - a);
}
static double grad(int hash, double x, double y, double z) {
    int h = hash & 15;                      // CONVERT LO 4 BITS OF HASH CODE
    double u = h<8||h==12||h==13 ? x : y,   // INTO 12 GRADIENT DIRECTIONS.
            v = h<4||h==12||h==13 ? y : z;
    return ((h&1) == 0 ? u : -u) + ((h&2) == 0 ? v : -v);
}
 
double noise(double x, double y, double z) {
 
    perlin & myPerlin = perlin::getInstance();
    int X = (int)floor(x) & 255,                  // FIND UNIT CUBE THAT
        Y = (int)floor(y) & 255,                  // CONTAINS POINT.
        Z = (int)floor(z) & 255;
    x -= floor(x);                                // FIND RELATIVE X,Y,Z
    y -= floor(y);                                // OF POINT IN CUBE.
    z -= floor(z);
    double u = fade(x),                                // COMPUTE FADE CURVES
            v = fade(y),                                // FOR EACH OF X,Y,Z.
            w = fade(z);
    int A = myPerlin.p[X  ]+Y, AA = myPerlin.p[A]+Z, AB = myPerlin.p[A+1]+Z,      // HASH COORDINATES OF
        B = myPerlin.p[X+1]+Y, BA = myPerlin.p[B]+Z, BB = myPerlin.p[B+1]+Z;      // THE 8 CUBE CORNERS,
 
    return lerp(w, lerp(v, lerp(u, grad(myPerlin.p[AA  ], x  , y  , z   ),  // AND ADD
                                    grad(myPerlin.p[BA  ], x-1, y  , z   )), // BLENDED
                            lerp(u, grad(myPerlin.p[AB  ], x  , y-1, z   ),  // RESULTS
                                    grad(myPerlin.p[BB  ], x-1, y-1, z   ))),// FROM  8
                    lerp(v, lerp(u, grad(myPerlin.p[AA+1], x  , y  , z-1 ),  // CORNERS
                                    grad(myPerlin.p[BA+1], x-1, y  , z-1 )), // OF CUBE
                            lerp(u, grad(myPerlin.p[AB+1], x  , y-1, z-1 ),
                                    grad(myPerlin.p[BB+1], x-1, y-1, z-1 ))));
}
 
perlin::perlin (void)
{
    for (int i=0; i < 256 ; i++) {
        p[256+i] = p[i] = permutation[i];
    }
}
merci beaucoup pour votre aide..

ps: il s'agit d'un poste en C ce post concerne une traduction de code donc merci de ne pas deplacer ce post ailleurs :-)