928adb6484
Introduce a new tools.prng JS library which implements the musl libc srand() and rand() calls to produce identical pseudo random number sequences in the browser which is needed for the string to color conversion later on. Signed-off-by: Jo-Philipp Wich <jo@mein.io>
93 lines
1.4 KiB
JavaScript
93 lines
1.4 KiB
JavaScript
'use strict';
|
|
|
|
var s = [0x0000, 0x0000, 0x0000, 0x0000];
|
|
|
|
function mul(a, b) {
|
|
var r = [0x0000, 0x0000, 0x0000, 0x0000, 0x0000, 0x0000, 0x0000, 0x0000];
|
|
|
|
for (var j = 0; j < 4; j++) {
|
|
var k = 0;
|
|
for (var i = 0; i < 4; i++) {
|
|
var t = a[i] * b[j] + r[i+j] + k;
|
|
r[i+j] = t & 0xffff;
|
|
k = t >>> 16;
|
|
}
|
|
r[j+4] = k;
|
|
}
|
|
|
|
r.length = 4;
|
|
|
|
return r;
|
|
}
|
|
|
|
function add(a, n) {
|
|
var r = [0x0000, 0x0000, 0x0000, 0x0000],
|
|
k = n;
|
|
|
|
for (var i = 0; i < 4; i++) {
|
|
var t = a[i] + k;
|
|
r[i] = t & 0xffff;
|
|
k = t >>> 16;
|
|
}
|
|
|
|
return r;
|
|
}
|
|
|
|
function shr(a, n) {
|
|
var r = [a[0], a[1], a[2], a[3], 0x0000],
|
|
i = 4,
|
|
k = 0;
|
|
|
|
for (; n > 16; n -= 16, i--)
|
|
for (var j = 0; j < 4; j++)
|
|
r[j] = r[j+1];
|
|
|
|
for (; i > 0; i--) {
|
|
var s = r[i-1];
|
|
r[i-1] = (s >>> n) | k;
|
|
k = ((s & ((1 << n) - 1)) << (16 - n));
|
|
}
|
|
|
|
r.length = 4;
|
|
|
|
return r;
|
|
}
|
|
|
|
return L.Class.extend({
|
|
seed: function(n) {
|
|
n = (n - 1)|0;
|
|
s[0] = n & 0xffff;
|
|
s[1] = n >>> 16;
|
|
s[2] = 0;
|
|
s[3] = 0;
|
|
},
|
|
|
|
int: function() {
|
|
s = mul(s, [0x7f2d, 0x4c95, 0xf42d, 0x5851]);
|
|
s = add(s, 1);
|
|
|
|
var r = shr(s, 33);
|
|
return (r[1] << 16) | r[0];
|
|
},
|
|
|
|
get: function() {
|
|
var r = (this.int() % 0x7fffffff) / 0x7fffffff, l, u;
|
|
|
|
switch (arguments.length) {
|
|
case 0:
|
|
return r;
|
|
|
|
case 1:
|
|
l = 1;
|
|
u = arguments[0]|0;
|
|
break;
|
|
|
|
case 2:
|
|
l = arguments[0]|0;
|
|
u = arguments[1]|0;
|
|
break;
|
|
}
|
|
|
|
return Math.floor(r * (u - l + 1)) + l;
|
|
}
|
|
});
|