Created
April 10, 2017 19:46
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A simple SQRT table generator
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// A simple SQRT table generator | |
// | |
// Author: orIgo / iNSANE^C!S 2017 | |
// License: Buy-Me-A-Beer License 1.0 | |
// | |
// Produces a "stretched" sqrt table | |
// that fits in the range 0-RANGE | |
// and outputs an asm include file. | |
// | |
// Binary file generation is left | |
// as an exercise to the user. | |
// | |
// Settings | |
const WIDTH = 256; | |
const HEIGHT = 256; | |
const OUTSIZE = "w"; // or "w" or "l" or "n" if you like | |
const RANGE = 255; // set to 15 for "n" | |
// Defaults, modify if you only want a subset | |
const START_ROW = 0; | |
const END_ROW = HEIGHT; | |
const START_COL = 0; | |
const END_COL = WIDTH; | |
// max is known, calculate it for scaling | |
const max = Math.floor( Math.sqrt( (END_COL*END_COL)+(END_ROW*END_ROW) ) ); | |
const scale = (RANGE/max); | |
var rows = []; | |
for(var y=START_ROW; y < END_ROW; y++) | |
{ | |
var r = []; | |
for(var x=START_COL; x < END_COL; x++) | |
{ | |
r.push(Math.sqrt( (x*x)+(y*y) )); | |
} | |
rows.push(r); | |
} | |
rows.forEach( | |
function(r) | |
{ | |
var suffix = OUTSIZE; | |
r = r.map( | |
function(cs) { | |
return Math.floor(cs * scale); | |
}); | |
if(OUTSIZE === 'n') { // nibble =) | |
var r2 = []; | |
for(var i=0; i < r.length; i+=2) { | |
var acc = ((r[i] & 15)<<4) | (r[i+1]&15); | |
r2.push(acc); | |
} | |
r = r2; | |
suffix = "b"; | |
} | |
console.log("\tdc."+suffix+" " + r.join(",")); | |
}); |
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