snuvi-engine/src/me/hammerle/snuviengine/game/World.java

package me.hammerle.snuviengine.game;

import java.io.IOException;
import me.hammerle.snuviengine.api.Chunk;
import me.hammerle.snuviengine.api.Shader;
import me.hammerle.snuviengine.api.Texture;
import me.hammerle.snuviengine.util.WrappedInputStream;
import me.hammerle.snuviengine.util.WrappedOutputStream;

public class World
{
    private int width;
    private int height;
    private Chunk[][] chunks;
    
    private final Texture tiles = new Texture("images/tileset-blackvolution.png");
    
    private final Hero h;
    
    private float cameraX = 0.0f;
    private float cameraY = 0.0f;
    private float lastCameraX = 0.0f;
    private float lastCameraY = 0.0f;
    
    public World(Hero h)
    {
        this.h = h;
    }
    
    public void read(WrappedInputStream in) throws IOException
    {
        width = in.readInt();
        height = in.readInt();
        if((width % Chunk.CHUNK_SIZE) != 0 || (height % Chunk.CHUNK_SIZE) != 0)
        {
            throw new IllegalArgumentException("world width and height must be a multiply of " + Chunk.CHUNK_SIZE);
        }
        chunks = new Chunk[width / Chunk.CHUNK_SIZE][height / Chunk.CHUNK_SIZE];
        for(int x = 0; x < chunks.length; x++)
        {
            for(int y = 0; y < chunks[x].length; y++)
            {
                chunks[x][y] = new Chunk(x, y);
                chunks[x][y].read(in);
            }
        }
    }
    
    public void write(WrappedOutputStream out) throws IOException
    {
        out.writeInt(width);
        out.writeInt(height);
        for(Chunk[] chunk : chunks)
        {
            for(Chunk c : chunk)
            {
                c.write(out);
            }
        }
    }
    
    public void tick()
    {
        h.tick();
        lastCameraX = cameraX;
        lastCameraY = cameraY;
        cameraX = -getViewX((float) h.xPos);
        cameraY = -getViewY((float) h.yPos);
    }
    
    public void renderTick(float lag)
    {
        Shader.translateTo(lastCameraX + (cameraX - lastCameraX) * lag, lastCameraY + (cameraY - lastCameraY) * lag);
        
        Shader.setColorEnabled(false);
        Shader.setTextureEnabled(true);
        tiles.bindTexture();
        for(Chunk[] chunk : chunks)
        {
            for(Chunk c : chunk)
            {
                c.drawBackground();
            }
        }
        
        Shader.updateMatrix();
        Shader.setColorEnabled(true);
        Shader.setTextureEnabled(false);
        h.renderTick(lag);
        
        Shader.setColorEnabled(false);
        Shader.setTextureEnabled(true);
        tiles.bindTexture();
        for(Chunk[] chunk : chunks)
        {
            for(Chunk c : chunk)
            {
                c.drawForeground();
            }
        }
    }
    
    private float getViewX(float x) 
    {
        x -= Shader.getViewWidth() >> 1;
        if(x < 0)
        {
            return 0;
        }
        float max = width * Chunk.TILE_SIZE - Shader.getViewWidth();
        if(x > max)
        {
            return max;
        }
        return x;
    }
    
    private float getViewY(float y) 
    {
        y -= Shader.getViewHeight() >> 1;
        if(y < 0)
        {
            return 0;
        }
        float max = height * Chunk.TILE_SIZE - Shader.getViewHeight();
        if(y > max)
        {
            return max;
        }
        return y;
    }
}