Support up to 16 icons for every feature

src/main/java/mods/betterfoliage/client/render/IconSet.java

@@ -0,0 +1,58 @@
+package mods.betterfoliage.client.render;
+
+import java.io.IOException;
+
+import net.minecraft.client.Minecraft;
+import net.minecraft.client.renderer.texture.IIconRegister;
+import net.minecraft.client.resources.IResource;
+import net.minecraft.client.resources.IResourceManager;
+import net.minecraft.util.IIcon;
+import net.minecraft.util.ResourceLocation;
+
+/** Loads an indexed set of textures
+ * @author octarine-noise
+ */
+public class IconSet {
+
+	/** Icon array */
+	public IIcon[] icons = new IIcon[16];
+	
+	/** Number of successfully loaded icons*/
+	public int numLoaded = 0;
+	
+	/** Resource domain of icons */
+	String domain;
+	
+	/** Format string of icon paths */
+	String path;
+	
+	public IconSet(String domain, String path) {
+		this.domain = domain;
+		this.path = path;
+	}
+	
+	public void registerIcons(IIconRegister register) {
+		numLoaded = 0;
+		IResourceManager manager = Minecraft.getMinecraft().getResourceManager();
+		
+		for (int idx = 0; idx < 16; idx++) {
+			icons[idx] = null;
+			// if the path contains a domain, use that to check if the resource exists
+			String resolvedDomain = path.contains(":") ? new ResourceLocation(path).getResourceDomain() : domain;
+			String resolvedPath = String.format("textures/blocks/" + (path.contains(":") ? new ResourceLocation(path).getResourcePath() : path) + ".png", idx);
+			try {
+				IResource resource = manager.getResource(new ResourceLocation(resolvedDomain, resolvedPath));
+				if (resource != null) icons[numLoaded++] = register.registerIcon(domain + ":" + String.format(path, idx));
+			} catch (IOException e) {
+			}
+		}
+	}
+	
+	public IIcon get(int variation) {
+		return numLoaded == 0 ? null : icons[variation % numLoaded];
+	}
+	
+	public boolean hasIcons() {
+		return numLoaded > 0;
+	}
+}