Add config for radius, using a custom resourcepack

src/main/java/com/tterrag/blur/util/ShaderResourcePack.java

@@ -0,0 +1,70 @@
+package com.tterrag.blur.util;
+
+import java.awt.image.BufferedImage;
+import java.io.ByteArrayInputStream;
+import java.io.IOException;
+import java.io.InputStream;
+import java.util.Scanner;
+import java.util.Set;
+
+import net.minecraft.client.resources.IResourcePack;
+import net.minecraft.client.resources.data.IMetadataSection;
+import net.minecraft.client.resources.data.MetadataSerializer;
+import net.minecraft.util.ResourceLocation;
+
+import com.google.common.collect.ImmutableSet;
+import com.tterrag.blur.Blur;
+
+public class ShaderResourcePack implements IResourcePack {
+	
+	protected boolean validPath(ResourceLocation location) {
+		return location.getResourceDomain().equals("minecraft") && location.getResourcePath().startsWith("shaders/");
+	}
+
+	@Override
+	public InputStream getInputStream(ResourceLocation location) throws IOException {
+		if (validPath(location)) {
+			InputStream in = Blur.class.getResourceAsStream("/" + location.getResourcePath());
+			StringBuilder data = new StringBuilder();
+			Scanner scan = new Scanner(in);
+			try {
+				while (scan.hasNextLine()) {
+					data.append(scan.nextLine().replaceAll("@radius@", Integer.toString(Blur.instance.radius))).append('\n');
+				}
+			} finally {
+				scan.close();
+			}
+			
+			return new ByteArrayInputStream(data.toString().getBytes());
+		}
+		return null;
+	}
+
+	@Override
+	public boolean resourceExists(ResourceLocation location) {
+		return validPath(location) && Blur.class.getResource("/" + location.getResourcePath()) != null;
+	}
+
+	@Override
+	public Set<String> getResourceDomains() {
+		return ImmutableSet.of("minecraft");
+	}
+
+	@Override
+	public <T extends IMetadataSection> T getPackMetadata(
+			MetadataSerializer metadataSerializer, String metadataSectionName)
+			throws IOException {
+		return null;
+	}
+
+	@Override
+	public BufferedImage getPackImage() throws IOException {
+		return null;
+	}
+
+	@Override
+	public String getPackName() {
+		return "Blur dummy resource pack";
+	}
+
+}