package vn.fynngamadeyo.adengo.graphics;

import java.util.Random;

public class Screen {
	private int width, height;
	public int[] pixels;
	
	public final int MAP_SIZE=64;
	public final int MAP_SIZE_MASK = MAP_SIZE -1;
	
	public int[] tiles = new int[MAP_SIZE*MAP_SIZE];
	
	private Random random = new Random();

	public Screen(int width, int heiht){
		this.width=width;
		this.height=heiht;
		pixels = new int[width*heiht];
		
		for(int i=0;i< MAP_SIZE*MAP_SIZE;i++){
			tiles[i] = random.nextInt(0xffffff);
		}
	}
	
	public void clear(){
		for(int i=0;i<pixels.length;i++){
			pixels[i]=0;
		}
	}

	public void render(int xOffset, int yOffset){
		for(int y=0;y<height;y++){
			int yy=y +yOffset;
			//if(yy <0 || yy >=height) break;
		
			for(int x=0; x<width;x++){
				int xx=x+xOffset;
				//if(xx <0 || xx >= width ) break;
				// x / 16 equal x >> 4
				int tileIndex = ((xx >> 4) & MAP_SIZE_MASK) + ((yy >> 4) & MAP_SIZE_MASK)* MAP_SIZE;
				
				pixels[x + y * width] = Sprite.grass.pixels[(x&15)+(y&15)*Sprite.grass.SIZE];
			}
		}
	}
	
}
