package codechicken.core.asm;
import codechicken.lib.asm.*;
import codechicken.lib.asm.ModularASMTransformer.MethodReplacer;
import codechicken.lib.asm.ModularASMTransformer.MethodTransformer;
import codechicken.lib.asm.ModularASMTransformer.MethodWriter;
import org.objectweb.asm.Opcodes;
import org.objectweb.asm.tree.InsnNode;
import org.objectweb.asm.tree.JumpInsnNode;
import org.objectweb.asm.tree.LabelNode;
import org.objectweb.asm.tree.MethodNode;
import codechicken.lib.config.ConfigTag;
import net.minecraft.launchwrapper.IClassTransformer;
import java.util.Map;
import static codechicken.lib.asm.InsnComparator.*;
public class TweakTransformer implements IClassTransformer, Opcodes
{
static {
ASMInit.init();
}
private static ModularASMTransformer transformer = new ModularASMTransformer();
private static Map<String, ASMBlock> blocks = ASMReader.loadResource("/assets/codechickencore/asm/tweaks.asm");
public static ConfigTag tweaks;
public static void load() {
CodeChickenCoreModContainer.loadConfig();
tweaks = CodeChickenCoreModContainer.config.getTag("tweaks")
.setComment("Various tweaks that can be applied to game mechanics.").useBraces();
tweaks.removeTag("persistantLava");
if (tweaks.getTag("environmentallyFriendlyCreepers")
.setComment("If set to true, creepers will not destroy landscape. (A version of mobGriefing setting just for creepers)")
.getBooleanValue(false)) {
transformer.add(new MethodReplacer(new ObfMapping("net/minecraft/entity/monster/EntityCreeper", "func_146077_cc", "()V"),
blocks.get("d_environmentallyFriendlyCreepers"), blocks.get("environmentallyFriendlyCreepers")));
}
if (!tweaks.getTag("softLeafReplace")
.setComment("If set to false, leaves will only replace air when growing")
.getBooleanValue(false)) {
transformer.add(new MethodWriter(ACC_PUBLIC, new ObfMapping("net/minecraft/block/Block", "canBeReplacedByLeaves", "(Lnet/minecraft/world/IBlockAccess;III)Z"), blocks.get("softLeafReplace")));
}
if (tweaks.getTag("doFireTickOut")
.setComment("If set to true and doFireTick is disabled in the game rules, fire will still dissipate if it's not over a fire source")
.getBooleanValue(true)) {
transformer.add(new MethodTransformer(new ObfMapping("net/minecraft/block/BlockFire", "func_149674_a", "(Lnet/minecraft/world/World;IIILjava/util/Random;)V"))
{
@Override
public void transform(MethodNode mv) {
ASMBlock needle = blocks.get("n_doFireTick");
ASMBlock inject = blocks.get("doFireTick");
ASMBlock key = needle.applyLabels(findOnce(mv.instructions, needle.list));
LabelNode jlabel = key.get("LRET");
mv.instructions.insertBefore(jlabel, new JumpInsnNode(GOTO, inject.get("LSKIP")));
mv.instructions.insert(jlabel, inject.list.list);
}
});
}
if (tweaks.getTag("finiteWater")
.setComment("If set to true two adjacent water source blocks will not generate a third.")
.getBooleanValue(false)) {
transformer.add(new MethodTransformer(new ObfMapping("net/minecraft/block/BlockDynamicLiquid", "func_149674_a", "(Lnet/minecraft/world/World;IIILjava/util/Random;)V"))
{
@Override
public void transform(MethodNode mv) {
InsnListSection key = findOnce(mv.instructions, blocks.get("finiteWater").list);
key.setLast(((JumpInsnNode) key.getLast()).label);
key.remove();
}
});
}
}
@Override
public byte[] transform(String name, String tname, byte[] bytes) {
return transformer.transform(name, bytes);
}
}