package nmegl.utils;


class Int16Array extends ArrayBufferView implements ArrayAccess<Int> {
    
    
    static public inline var SBYTES_PER_ELEMENT = 2;
    
    public var BYTES_PER_ELEMENT (default, null):Int;
    public var length (default, null):Int;
    
    
    public function new (bufferOrArray:Dynamic, start:Int = 0, length:Null<Int> = null) {
        
        BYTES_PER_ELEMENT = 2;
        
        if (Std.is (bufferOrArray, Int)) {
            
            super (Std.int (bufferOrArray) << 1);
            
        } else if (Std.is (bufferOrArray, Array)) {
            
            var ints:Array<Int> = bufferOrArray;
            
            if (length != null) {
                
                this.length = length;
                
            } else {
                
                this.length = ints.length - start;
                
            }
            
            super (this.length << 1);
            
            #if !cpp
            buffer.position = 0;
            #end
            
            for (i in 0...this.length) {
                
                #if cpp
                untyped __global__.__hxcpp_memory_set_i16 (bytes, (i << 1), ints[i]);
                #else
                buffer.writeShort (ints[i + start]);
                #end
                
            }
            
        } else {
            
            super (bufferOrArray, start, length);
            
            if ((byteLength & 0x01) > 0) {
                
                throw ("Invalid array size");
                
            }
            
            this.length = byteLength >> 1;
            
            if ((this.length << 1) != byteLength) {
                
                throw "Invalid length multiple";
                
            }
            
        }
        
    }
    
    
    @:noCompletion @:keep inline public function __get (index:Int):Int { return getInt16 (index << 1); }
    @:noCompletion @:keep inline public function __set (index:Int, value:Int):Void { setInt16 (index << 1, value); }
    
    
}