VirtualComputer/src/main/java/sznp/virtualcomputer/Computer.java

@@ -8,6 +8,7 @@ import org.bukkit.command.CommandSender;
 import org.virtualbox_6_0.*;
 import sznp.virtualcomputer.events.MachineEventHandler;
 import sznp.virtualcomputer.events.VBoxEventHandler;
+import sznp.virtualcomputer.renderer.GPURenderer;
 import sznp.virtualcomputer.renderer.GPURendererInternal;
 import sznp.virtualcomputer.renderer.MCFrameBuffer;
 import sznp.virtualcomputer.util.Scancode;
@@ -207,7 +208,7 @@ public final class Computer {
                 sendMessage(sender, "§eComputer powered off."); //This block runs later
             }
         });
-        GPURendererInternal.setPixels(new byte[1], 0, 0); //Black screen
+        GPURenderer.update(new byte[1], 0, 0, 0, 0, 640, 480); //Black screen
         stopEvents();
 		MouseLockerPlayerListener.computerStop();
     }

VirtualComputer/src/main/java/sznp/virtualcomputer/renderer/GPURenderer.java

@@ -16,8 +16,10 @@ public class GPURenderer extends MapRenderer implements IRenderer {
 	private byte[] buffer;
 	private GPURendererInternal kernel;
 	private WorldMap wmap;
+	private int mapx, mapy;
 	//Store at central location after conversion
 	private static int[] colors_;
+	private static int changedX, changedY, changedWidth, changedHeight;
 
 	public GPURenderer(short id, World world, int mapx, int mapy) throws Exception {
 		MapView map = IRenderer.prepare(id, world);
@@ -32,6 +34,8 @@ public class GPURenderer extends MapRenderer implements IRenderer {
 				colors_[i] = cs[i].getRGB();
 			}
 		}
+		this.mapx = mapx;
+		this.mapy = mapy;
 		Field field = map.getClass().getDeclaredField("worldMap");
 		field.setAccessible(true);
 		wmap = (WorldMap) field.get(map);
@@ -46,19 +50,34 @@ public class GPURenderer extends MapRenderer implements IRenderer {
 	public void render(MapView map, MapCanvas canvas, Player player) {
 		Timing t = new Timing();
 		try {
-			if (kernel.isRendered()) return; //TODO: Stop rendering after computer is stopped
+			if (kernel.isRendered()) return;
 			if (buffer == null) { //The buffer remains the same, as the canvas remains the same
 				Field field = canvas.getClass().getDeclaredField("buffer");
 				field.setAccessible(true);
 				buffer = (byte[]) field.get(canvas);
 			}
+			if (changedX >= (mapx + 1) * 128 || changedY >= (mapy + 1) * 128
+					|| changedX + changedWidth < mapx * 128 || changedY + changedHeight < mapy * 128)
+				return; //No change for this map - TODO: Test
+			int x = changedX % 128;
+			int y = changedY % 128;
+			int w = x + changedWidth >= 128 ? 128 - x - 1 : changedWidth;
+			int h = y + changedHeight >= 128 ? 128 - y - 1 : changedHeight;
 			kernel.render(buffer);
-			wmap.flagDirty(0, 0);
-			wmap.flagDirty(127, 127); // Send the whole image - TODO: Only send changes
+			wmap.flagDirty(x, y);
+			wmap.flagDirty(x + w, y + h); // Send the changes only
 		} catch (Exception e) {
 			e.printStackTrace();
 		}
 		if (t.elapsedMS() > 60)
 			System.out.println("Map rendering took " + t.elapsedMS() + "ms");
 	}
+
+	public static void update(byte[] pixels, int width, int height, int changedX, int changedY, int changedWidth, int changedHeight) {
+		GPURenderer.changedX = changedX;
+		GPURenderer.changedY = changedY;
+		GPURenderer.changedWidth = changedWidth;
+		GPURenderer.changedHeight = changedHeight;
+		GPURendererInternal.setPixels(pixels, width, height);
+	}
 }

VirtualComputer/src/main/java/sznp/virtualcomputer/renderer/GPURendererInternal.java

@@ -95,7 +95,7 @@ public class GPURendererInternal extends Kernel {
 	private static final int BLUE = 0;
 
 	@SuppressWarnings("Convert2Lambda") //Aparapi fails with lambdas
-	public static void setPixels(byte[] pixels, int width, int height) {
+	static void setPixels(byte[] pixels, int width, int height) {
 		renderers.forEach(new Consumer<GPURendererInternal>() {
 			@Override //IT'S THE LAMBDAS (exception)
 			public void accept(GPURendererInternal r) {

VirtualComputer/src/main/java/sznp/virtualcomputer/renderer/MCFrameBuffer.java

@@ -106,7 +106,7 @@ public class MCFrameBuffer implements IFramebuffer {
 					pointer = new Pointer(ptr[0]);
 					this.width = (int) w[0];
 					this.height = (int) h[0];
-					GPURendererInternal.setPixels(pointer.getByteArray(0L, (int) (w[0] * h[0] * 4)), (int) w[0], (int) h[0]);
+					GPURenderer.update(pointer.getByteArray(0L, (int) (w[0] * h[0] * 4)), (int) w[0], (int) h[0], 0, 0, this.width, this.height);
 				} else {
 					PluginMain.allpixels = new Pointer(ptr[0]).getByteBuffer(0L, width * height * 4);
 					if (width * height > 640 * 480)
@@ -129,7 +129,7 @@ public class MCFrameBuffer implements IFramebuffer {
 	@Override
 	public void notifyUpdate(long x, long y, long width, long height) {
 		Timing t = new Timing();
-		GPURendererInternal.setPixels(pointer.getByteArray(0L, (this.width * this.height * 4)), this.width, this.height); //TODO: Only copy changed part
+		GPURenderer.update(pointer.getByteArray(0L, this.width * this.height * 4), this.width, this.height, (int) x, (int) y, (int) width, (int) height);
 		if (t.elapsedMS() > 60) //Typically 1ms max
 			System.out.println("Update took " + t.elapsedMS() + "ms");
 	}