use double precision numbers in love.math.noise

src/libraries/noise1234/simplexnoise1234.cpp

@@ -85,7 +85,7 @@ unsigned char SimplexNoise1234::perm[512] = {151,160,137,91,90,15,
   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 
+  138,236,205,93,222,114,67,29,24,72,243,141,128,195,78,66,215,61,156,180
 };
 
 //---------------------------------------------------------------------
@@ -103,37 +103,35 @@ unsigned char SimplexNoise1234::perm[512] = {151,160,137,91,90,15,
  * float SLnoise = (SimplexNoise1234::noise(x,y,z) + 1.0) * 0.5;
  */
 
-float  SimplexNoise1234::grad( int hash, float x ) {
+double  SimplexNoise1234::grad( int hash, double x ) {
     int h = hash & 15;
-    float grad = 1.0f + (h & 7);   // Gradient value 1.0, 2.0, ..., 8.0
+    double grad = 1.0 + (h & 7);   // Gradient value 1.0, 2.0, ..., 8.0
     if (h&8) grad = -grad;         // Set a random sign for the gradient
     return ( grad * x );           // Multiply the gradient with the distance
 }
 
-float  SimplexNoise1234::grad( int hash, float x, float y ) {
+double  SimplexNoise1234::grad( int hash, double x, double y ) {
     int h = hash & 7;      // Convert low 3 bits of hash code
-    float u = h<4 ? x : y;  // into 8 simple gradient directions,
-    float v = h<4 ? y : x;  // and compute the dot product with (x,y).
-    return ((h&1)? -u : u) + ((h&2)? -2.0f*v : 2.0f*v);
+    double u = h<4 ? x : y;  // into 8 simple gradient directions,
+    double v = h<4 ? y : x;  // and compute the dot product with (x,y).
+    return ((h&1)? -u : u) + ((h&2)? -2.0*v : 2.0*v);
 }
 
 // 1D simplex noise
-float SimplexNoise1234::noise(float x) {
+float SimplexNoise1234::noise(double x) {
 
   int i0 = FASTFLOOR(x);
   int i1 = i0 + 1;
-  float x0 = x - i0;
-  float x1 = x0 - 1.0f;
+  double x0 = x - i0;
+  double x1 = x0 - 1.0;
 
-  float n0, n1;
+  double n0, n1;
 
-  float t0 = 1.0f - x0*x0;
-//  if(t0 < 0.0f) t0 = 0.0f;
+  double t0 = 1.0 - x0*x0;
   t0 *= t0;
   n0 = t0 * t0 * grad(perm[i0 & 0xff], x0);
 
-  float t1 = 1.0f - x1*x1;
-//  if(t1 < 0.0f) t1 = 0.0f;
+  double t1 = 1.0 - x1*x1;
   t1 *= t1;
   n1 = t1 * t1 * grad(perm[i1 & 0xff], x1);
   // The maximum value of this noise is 8*(3/4)^4 = 2.53125
@@ -143,25 +141,25 @@ float SimplexNoise1234::noise(float x) {
 }
 
 // 2D simplex noise
-float SimplexNoise1234::noise(float x, float y) {
+float SimplexNoise1234::noise(double x, double y) {
 
 #define F2 0.366025403 // F2 = 0.5*(sqrt(3.0)-1.0)
 #define G2 0.211324865 // G2 = (3.0-Math.sqrt(3.0))/6.0
 
-    float n0, n1, n2; // Noise contributions from the three corners
+    double n0, n1, n2; // Noise contributions from the three corners
 
     // Skew the input space to determine which simplex cell we're in
-    float s = (x+y)*F2; // Hairy factor for 2D
-    float xs = x + s;
-    float ys = y + s;
+    double s = (x+y)*F2; // Hairy factor for 2D
+    double xs = x + s;
+    double ys = y + s;
     int i = FASTFLOOR(xs);
     int j = FASTFLOOR(ys);
 
-    float t = (float)(i+j)*G2;
-    float X0 = i-t; // Unskew the cell origin back to (x,y) space
-    float Y0 = j-t;
-    float x0 = x-X0; // The x,y distances from the cell origin
-    float y0 = y-Y0;
+    double t = (i+j)*G2;
+    double X0 = i-t; // Unskew the cell origin back to (x,y) space
+    double Y0 = j-t;
+    double x0 = x-X0; // The x,y distances from the cell origin
+    double y0 = y-Y0;
 
     // For the 2D case, the simplex shape is an equilateral triangle.
     // Determine which simplex we are in.
@@ -173,32 +171,32 @@ float SimplexNoise1234::noise(float x, float y) {
     // a step of (0,1) in (i,j) means a step of (-c,1-c) in (x,y), where
     // c = (3-sqrt(3))/6
 
-    float x1 = x0 - i1 + G2; // Offsets for middle corner in (x,y) unskewed coords
-    float y1 = y0 - j1 + G2;
-    float x2 = x0 - 1.0f + 2.0f * G2; // Offsets for last corner in (x,y) unskewed coords
-    float y2 = y0 - 1.0f + 2.0f * G2;
+    double x1 = x0 - i1 + G2; // Offsets for middle corner in (x,y) unskewed coords
+    double y1 = y0 - j1 + G2;
+    double x2 = x0 - 1.0 + 2.0 * G2; // Offsets for last corner in (x,y) unskewed coords
+    double y2 = y0 - 1.0 + 2.0 * G2;
 
     // Wrap the integer indices at 256, to avoid indexing perm[] out of bounds
     int ii = i & 0xff;
     int jj = j & 0xff;
 
     // Calculate the contribution from the three corners
-    float t0 = 0.5f - x0*x0-y0*y0;
-    if(t0 < 0.0f) n0 = 0.0f;
+    double t0 = 0.5 - x0*x0-y0*y0;
+    if(t0 < 0.0) n0 = 0.0;
     else {
       t0 *= t0;
-      n0 = t0 * t0 * grad(perm[ii+perm[jj]], x0, y0); 
+      n0 = t0 * t0 * grad(perm[ii+perm[jj]], x0, y0);
     }
 
-    float t1 = 0.5f - x1*x1-y1*y1;
-    if(t1 < 0.0f) n1 = 0.0f;
+    double t1 = 0.5 - x1*x1-y1*y1;
+    if(t1 < 0.0) n1 = 0.0;
     else {
       t1 *= t1;
       n1 = t1 * t1 * grad(perm[ii+i1+perm[jj+j1]], x1, y1);
     }
 
-    float t2 = 0.5f - x2*x2-y2*y2;
-    if(t2 < 0.0f) n2 = 0.0f;
+    double t2 = 0.5 - x2*x2-y2*y2;
+    if(t2 < 0.0) n2 = 0.0;
     else {
       t2 *= t2;
       n2 = t2 * t2 * grad(perm[ii+1+perm[jj+1]], x2, y2);