|
@@ -0,0 +1,76 @@
|
|
|
+#include "common/world/HighMap.h"
|
|
|
+#include "gaming-core/utils/Random.h"
|
|
|
+
|
|
|
+static constexpr 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 int p[512];
|
|
|
+
|
|
|
+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) {
|
|
|
+ int h = hash & 15;
|
|
|
+ double u = h < 8 ? x : y;
|
|
|
+ double v = h < 4 ? y : (h == 12 || h == 14 ? x : 0);
|
|
|
+ return ((h & 1) == 0 ? u : -u) + ((h & 2) == 0 ? v : -v);
|
|
|
+}
|
|
|
+
|
|
|
+HighMap::HighMap(int height) : height(height) {
|
|
|
+ for(int i = 0; i < 256; i++)
|
|
|
+ p[256 + i] = p[i] = permutation[i];
|
|
|
+}
|
|
|
+
|
|
|
+int HighMap::getHeight(int x2, int y2) const {
|
|
|
+ float x = x2 / 64.0f;
|
|
|
+ float y = y2 / 64.0f;
|
|
|
+ int X = ((int)x) & 255;
|
|
|
+ int Y = ((int)y) & 255;
|
|
|
+ x -= (int)(x);
|
|
|
+ y -= (int)(y);
|
|
|
+ double u = fade(x);
|
|
|
+ double v = fade(y);
|
|
|
+ int A = p[X] + Y;
|
|
|
+ int AA = p[A];
|
|
|
+ int AB = p[A + 1];
|
|
|
+ int B = p[X + 1] + Y;
|
|
|
+ int BA = p[B];
|
|
|
+ int BB = p[B + 1];
|
|
|
+
|
|
|
+ double d = lerp(v, lerp(u, grad(p[AA], x, y), grad(p[BA], x - 1, y)),
|
|
|
+ lerp(u, grad(p[AB], x, y - 1), grad(p[BB], x - 1, y - 1)));
|
|
|
+ d *= d;
|
|
|
+ return static_cast<unsigned int>(d * height + 1.0) % height;
|
|
|
+}
|
|
|
+
|
|
|
+unsigned int pot(unsigned int a, unsigned int n) {
|
|
|
+ unsigned int sum = 0;
|
|
|
+ while(n > 0) {
|
|
|
+ if(n & 1) {
|
|
|
+ sum += a;
|
|
|
+ }
|
|
|
+ a *= a;
|
|
|
+ n >>= 1;
|
|
|
+ }
|
|
|
+ return sum;
|
|
|
+}
|
|
|
+
|
|
|
+int HighMap::random(int x, int y) const {
|
|
|
+ return (pot(328249, x) + pot(894503, y)) % height;
|
|
|
+}
|