worley_noise_2d_q15()

int32_t fl::worley_noise_2d_q15	(	int32_t	x,
		int32_t	y )

Definition at line 33 of file noise_woryley.cpp.

                                                  {
    int32_t cell_x = x >> 15;
    int32_t cell_y = y >> 15;
 
    int32_t min_dist = INT32_MAX;
 
    // Check surrounding 9 cells
    for (int dy = -1; dy <= 1; ++dy) {
        for (int dx = -1; dx <= 1; ++dx) {
            int32_t gx = cell_x + dx;
            int32_t gy = cell_y + dy;
 
            int32_t fx, fy;
            feature_point(gx, gy, fx, fy);
 
            int32_t feature_x = (gx << 15) + fx;
            int32_t feature_y = (gy << 15) + fy;
 
            int32_t dx_q15 = x - feature_x;
            int32_t dy_q15 = y - feature_y;
 
            // Approximate distance using Manhattan (faster) or Euclidean
            // (costlier)
            int32_t dist =
                q15_abs(dx_q15) + q15_abs(dy_q15); // Manhattan distance
 
            if (dist < min_dist)
                min_dist = dist;
        }
    }
 
    // Normalize: maximum possible distance is roughly 2*Q15_ONE
    return (min_dist << 15) / (2 * Q15_ONE);
}

References INT32_MAX, x, and y.