Show a custom message when shaderpack compilation fails

mod/src/main/java/dev/ferriarnus/monocle/irisCompatibility/mixin/ClientPacketListenerMixin.java

@@ -0,0 +1,41 @@
+package dev.ferriarnus.monocle.irisCompatibility.mixin;
+
+import net.irisshaders.iris.Iris;
+import net.minecraft.ChatFormatting;
+import net.minecraft.client.Minecraft;
+import net.minecraft.client.multiplayer.ClientPacketListener;
+import net.minecraft.network.chat.ClickEvent;
+import net.minecraft.network.chat.Component;
+import net.minecraft.network.chat.HoverEvent;
+import org.spongepowered.asm.mixin.Mixin;
+import org.spongepowered.asm.mixin.injection.At;
+import org.spongepowered.asm.mixin.injection.Inject;
+import org.spongepowered.asm.mixin.injection.callback.CallbackInfo;
+
+@Mixin(ClientPacketListener.class)
+public class ClientPacketListenerMixin {
+    /**
+     * @author embeddedt
+     * @reason make sure the message directs users to us, not Iris, as our transformer likely has different behavior
+     * from theirs
+     */
+    @Inject(method = "handleLogin", at = @At(value = "INVOKE", target = "Lnet/minecraft/network/protocol/game/ClientboundLoginPacket;enforcesSecureChat()Z"))
+    private void printMonocleErrorForIrisError(CallbackInfo ci) {
+        var player = Minecraft.getInstance().player;
+
+        if (player == null) {
+            return;
+        }
+
+        // Same logic as Iris' mixin, but run earlier to suppress their logic
+        Iris.getStoredError().ifPresent(e -> {
+            player.displayClientMessage(Component.translatable(
+                    "monocle.shader_load_exception"
+            ).append(Component.literal("Copy Info").withStyle(arg ->
+                    arg.withUnderlined(true).withColor(ChatFormatting.BLUE)
+                            .withClickEvent(new ClickEvent(ClickEvent.Action.COPY_TO_CLIPBOARD, e.getMessage()))
+                            .withHoverEvent(new HoverEvent(HoverEvent.Action.SHOW_TEXT, Component.translatable("chat.copy.click")))
+            )), false);
+        });
+    }
+}

mod/src/main/resources/assets/monocle/lang/en_us.json

@@ -0,0 +1,3 @@
+{
+  "monocle.shader_load_exception": "An internal error was encountered while loading the shaderpack. Please report this to the Monocle team. "
+}

mod/src/main/resources/mixins.monocle.compat.iris.json

@@ -10,6 +10,7 @@
     "conformVisibility": true
   },
   "client": [
+    "ClientPacketListenerMixin",
     "CrashReportExtenderMixin",
     "DebugScreenOverlayMixin",
     "IrisRenderingPipelineMixin",