hack block ID seen by ShadersMod mid-render

move block ID override to dedicated class

src/main/java/mods/betterfoliage/client/ShadersModIntegration.java

@@ -0,0 +1,55 @@
+package mods.betterfoliage.client;
+
+import java.lang.reflect.Field;
+
+import net.minecraft.block.Block;
+import net.minecraft.init.Blocks;
+
+public class ShadersModIntegration {
+
+	private static boolean hasShadersMod = false;
+	private static int tallGrassEntityData;
+	private static int leavesEntityData;
+	private static Field shadersEntityData;
+	private static Field shadersEntityDataIndex;
+	
+	private ShadersModIntegration() {}
+	
+	public static void init() {
+		tallGrassEntityData = Block.blockRegistry.getIDForObject(Blocks.tallgrass) & 0xFFFF | Blocks.tallgrass.getRenderType() << 16;
+		leavesEntityData = Block.blockRegistry.getIDForObject(Blocks.leaves) & 0xFFFF | Blocks.leaves.getRenderType() << 16;
+		
+		try {
+			Class<?> classShaders = Class.forName("shadersmodcore.client.Shaders");
+			shadersEntityData = classShaders.getDeclaredField("entityData");
+			shadersEntityDataIndex = classShaders.getDeclaredField("entityDataIndex");
+			hasShadersMod = true;
+		} catch(Exception e) {
+		}
+	}
+	
+	public static void startGrassQuads() {
+		if (!hasShadersMod) return;
+		setShadersEntityData(tallGrassEntityData);
+	}
+
+	public static void startLeavesQuads() {
+		if (!hasShadersMod) return;
+		setShadersEntityData(leavesEntityData);
+	}
+	
+	private static void setShadersEntityData(int data) {
+		try {
+			int[] entityData = (int[]) shadersEntityData.get(null);
+			int entityDataIndex = shadersEntityDataIndex.getInt(null);
+			entityData[(entityDataIndex * 2)] = data;
+		} catch (Exception e) {
+		}
+	}
+	
+	public static int getBlockIdOverride(int original, Block block) {
+		if (BetterFoliageClient.leaves.matchesID(original & 0xFFFF)) return tallGrassEntityData;
+		if (BetterFoliageClient.crops.matchesID(original & 0xFFFF)) return leavesEntityData;
+		return original;
+	}
+}