rpg.util.js

var Sphere = {"Enum":{}};

Sphere.color = function(r,g,b) {
	var a = arguments.length>3?arguments[3]:255;
	return {
		"red":r,
		"green":g,
		"blue":b,
		"alpha":a,
		"toString":function(){
			//if (a>=255) return "rgb("+r+","+g+","+b+")";
			//else
			return "rgba("+r+","+g+","+b+","+a+")";
		}
	};
};

Sphere.Enum.Directions = [
	"north",
	"northeast",
	"east",
	"southeast",
	"south",
	"southwest",
	"west",
	"northwest"
];

//// FROM https://www.codeproject.com/Tips/387989/Convert-Binary-Single-Precision-Value-to-Float-in
function ieee32ToFloat(intval) {
	var fval = 0.0;
	var x;//exponent
	var m;//mantissa
	var s;//sign
	s = (intval & 0x80000000)?-1:1;
	x = ((intval >> 23) & 0xFF);
	m = (intval & 0x7FFFFF);
	switch(x) {
		case 0:
			//zero, do nothing, ignore negative zero and subnormals
			break;
		case 0xFF:
			if (m) fval = NaN;
			else if (s > 0) fval = Number.POSITIVE_INFINITY;
			else fval = Number.NEGATIVE_INFINITY;
			break;
		default:
			x -= 127;
			m += 0x800000;
			fval = s * (m / 8388608.0) * Math.pow(2, x);
			break;
	}
	return fval;
} 

Sphere.util = {
	"animate":(function(callback) {
		return window.requestAnimationFrame || window.webkitRequestAnimationFrame || window.mozRequestAnimationFrame || window.oRequestAnimationFrame || window.msRequestAnimationFrame ||
			function(callback) {return window.setTimeout(callback, 1000 / 60);};
	})(),
	"parseLE":function(d){var r=0,i=-1;while(++i<d.length)r+=((d.charCodeAt(i)&0xff)<<(8*i));return r;},
	"parseFloat32LE":function(d){var ret = this.parseLE(d); return ieee32ToFloat(ret);},
	"parseBitmap":function(d){
		var _ret = [], q = -1, i = -1; while (i<d.length) {
			_ret[++q] = Sphere.color(d.charCodeAt(++i)&0xff,d.charCodeAt(++i)&0xff,d.charCodeAt(++i)&0xff,d.charCodeAt(++i)&0xff);
		};
		return _ret;
	},
	"parseString":function(d){var l=this.parseLE(d.substr(0,2));return d.substr(2,l);},
	"blitRGBA":function(c){	// blit RGBA pixel with optional rect clipping
		var w = this.width, h = this.height;
		var y = arguments.length>2?arguments[2]:0,
			x = arguments.length>1?arguments[1]:0;
		var _z = arguments.length>4?y+arguments[4]:y+h,
			_q = arguments.length>3?x+arguments[3]:x+w;
		var old = false;
		if (!old) {
			var id = c.createImageData(w,h);
			var i = 0, _h = 0, q = 0; if (c) {
				while (i<this.data.length) {
					if (i>1&&(i%w)===0) ++_h;
					if ((x+i%w)<_q&&(y+_h)<_z) {
						id.data[q+0] = this.data[i].red&0xff;
						id.data[q+1] = this.data[i].green&0xff;
						id.data[q+2] = this.data[i].blue&0xff;
						id.data[q+3] = this.data[i].alpha&0xff;
					}
					else {
						id.data[q+0] =
						id.data[q+1] =
						id.data[q+2] =
						id.data[q+3] = 0;
					}
					++i;
					q += 4;
				}
				c.putImageData(id, x,y);
			}
			else console.log("Sphere::util.blitRGBA - Couldn't blit "+w+"*"+h+" canvas");
		}
		else {
			var i = 0, _h = 0; if (c) while (i<this.data.length) {
				if (i>1&&(i%w)===0) ++_h;
				if ((x+i%w)<_q&&(y+_h)<_z) {
					c.plot(x+i%w, y+_h, this.data[i].toString());
					//console.log(x+i%w, y+_h, this.data[i].toString());
				}
				++i;
			}
			else console.log("Sphere::util.blitRGBA - Couldn't blit "+w+"*"+h+" canvas");
		}
	}
};