StateMc/BetterFoliage
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reworked class transformer

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octarine-noise
2014-06-27 22:14:07 +02:00
parent 3bd402b964
commit 30f199e9a2
6 changed files with 160 additions and 58 deletions
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68
src/main/java/mods/betterfoliage/loader/BetterFoliageTransformer.java
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@@ -1,63 +1,27 @@
package mods.betterfoliage.loader;
import mods.betterfoliage.common.util.DeobfNames;
import net.minecraft.launchwrapper.IClassTransformer;
import org.apache.logging.log4j.LogManager;
import org.apache.logging.log4j.Logger;
import org.objectweb.asm.ClassReader;
import org.objectweb.asm.ClassWriter;
import org.objectweb.asm.Opcodes;
import org.objectweb.asm.tree.ClassNode;
import org.objectweb.asm.tree.AbstractInsnNode;
import org.objectweb.asm.tree.MethodInsnNode;
import org.objectweb.asm.tree.MethodNode;
import org.objectweb.asm.tree.VarInsnNode;
/** Transformer overriding the first line of RenderBlocks.renderBlockByRenderType()
* with the following instruction:<br/><br/>
* int l = mods.betterfoliage.BlockRenderTypeOverride.getRenderType(block);<br/><br/>
*
* @author octarine-noise
*/
public class BetterFoliageTransformer implements IClassTransformer {
public class BetterFoliageTransformer extends EZTransformerBase {
Logger log = LogManager.getLogger("BetterFoliageCore");
public byte[] transform(String name, String transformedName, byte[] basicClass) {
if (basicClass == null) return null;
if (transformedName.equals("net.minecraft.client.renderer.RenderBlocks")) {
log.info(String.format("Found class %s", transformedName));
ClassNode classNode = new ClassNode();
ClassReader classReader = new ClassReader(basicClass);
classReader.accept(classNode, 0);
for (MethodNode mn : classNode.methods) {
boolean found = false;
boolean obf = false;
if (mn.desc.equals(DeobfNames.RB_RBBRT_SIG_MCP) && (mn.name.equals(DeobfNames.RB_RBBRT_NAME_MCP))) {
found = true;
} else if (mn.desc.equals(DeobfNames.RB_RBBRT_SIG_OBF) && (mn.name.equals(DeobfNames.RB_RBBRT_NAME_OBF))) {
found = true;
obf = true;
}
if (found) {
log.info("Overriding RenderBlocks.renderBlockByRenderType()");
int invokeNodeIdx = 0;
for (int idx = 0; idx < mn.instructions.size(); idx++) if (mn.instructions.get(idx) instanceof MethodInsnNode) {
invokeNodeIdx = idx;
break;
}
mn.instructions.remove(mn.instructions.get(invokeNodeIdx));
MethodInsnNode replacement = new MethodInsnNode(Opcodes.INVOKESTATIC, "mods/betterfoliage/BlockRenderTypeOverride", "getRenderType", obf ? DeobfNames.BRTO_GRT_SIG_OBF : DeobfNames.BRTO_GRT_SIG_MCP);
mn.instructions.insertBefore(mn.instructions.get(invokeNodeIdx), replacement);
break;
}
}
ClassWriter writer = new ClassWriter(0);
classNode.accept(writer);
return writer.toByteArray();
}
return basicClass;
@MethodTransform(className="net.minecraft.client.renderer.RenderBlocks",
obf=@MethodMatch(name=DeobfNames.RB_RBBRT_NAME_OBF, signature=DeobfNames.RB_RBBRT_SIG_OBF),
deobf=@MethodMatch(name=DeobfNames.RB_RBBRT_NAME_MCP, signature=DeobfNames.RB_RBBRT_SIG_MCP),
log="Adding RenderBlocks.renderBlockByRenderType() render type ovverride")
public void handleRenderBlockOverride(MethodNode method, boolean obf) {
AbstractInsnNode invokeGetRenderType = findNext(method.instructions.getFirst(), matchInvokeAny());
AbstractInsnNode storeRenderType = findNext(invokeGetRenderType, matchOpcode(Opcodes.ISTORE));
insertAfter(method.instructions, storeRenderType,
new VarInsnNode(Opcodes.ILOAD, 5),
new VarInsnNode(Opcodes.ALOAD, 1),
new MethodInsnNode(Opcodes.INVOKESTATIC, "mods/betterfoliage/BlockRenderTypeOverride", "getRenderTypeOverride", obf ? DeobfNames.BRTO_GRTO_SIG_OBF : DeobfNames.BRTO_GRTO_SIG_MCP),
new VarInsnNode(Opcodes.ISTORE, 5)
);
}
}