Fix JEI integration for MC 1.21

- Use the client side registry access (possible now that we've moved
   JEI to the client).

 - Generate unique ids for JEI recipes.

projects/common/src/client/java/dan200/computercraft/client/integration/jei/JEIComputerCraft.java

@@ -19,6 +19,8 @@ import mezz.jei.api.ingredients.subtypes.IIngredientSubtypeInterpreter;
 import mezz.jei.api.registration.IAdvancedRegistration;
 import mezz.jei.api.registration.ISubtypeRegistration;
 import mezz.jei.api.runtime.IJeiRuntime;
+import net.minecraft.client.Minecraft;
+import net.minecraft.core.RegistryAccess;
 import net.minecraft.resources.ResourceLocation;
 import net.minecraft.world.item.ItemStack;
 
@@ -44,7 +46,7 @@ public class JEIComputerCraft implements IModPlugin {
 
     @Override
     public void registerAdvanced(IAdvancedRegistration registry) {
-        registry.addRecipeManagerPlugin(new RecipeResolver());
+        registry.addRecipeManagerPlugin(new RecipeResolver(getRegistryAccess()));
     }
 
     @Override
@@ -52,7 +54,7 @@ public class JEIComputerCraft implements IModPlugin {
         var registry = runtime.getRecipeManager();
 
         // Register all turtles/pocket computers (not just vanilla upgrades) as upgrades on JEI.
-        var upgradeItems = RecipeModHelpers.getExtraStacks(RecipeModHelpers.getEmptyRegistryAccess());
+        var upgradeItems = RecipeModHelpers.getExtraStacks(getRegistryAccess());
         if (!upgradeItems.isEmpty()) {
             runtime.getIngredientManager().addIngredientsAtRuntime(VanillaTypes.ITEM_STACK, upgradeItems);
         }
@@ -99,4 +101,8 @@ public class JEIComputerCraft implements IModPlugin {
      * Distinguishes disks by colour.
      */
     private static final IIngredientSubtypeInterpreter<ItemStack> diskSubtype = (stack, ctx) -> Integer.toString(DiskItem.getColour(stack));
+
+    private static RegistryAccess getRegistryAccess() {
+        return Minecraft.getInstance().level.registryAccess();
+    }
 }

projects/common/src/client/java/dan200/computercraft/client/integration/jei/RecipeResolver.java

@@ -5,7 +5,6 @@
 package dan200.computercraft.client.integration.jei;
 
 import dan200.computercraft.api.ComputerCraftAPI;
-import dan200.computercraft.shared.integration.RecipeModHelpers;
 import dan200.computercraft.shared.integration.UpgradeRecipeGenerator;
 import dan200.computercraft.shared.pocket.items.PocketComputerItem;
 import dan200.computercraft.shared.turtle.items.TurtleItem;
@@ -14,6 +13,7 @@ import mezz.jei.api.recipe.IFocus;
 import mezz.jei.api.recipe.RecipeType;
 import mezz.jei.api.recipe.advanced.IRecipeManagerPlugin;
 import mezz.jei.api.recipe.category.IRecipeCategory;
+import net.minecraft.core.HolderLookup;
 import net.minecraft.resources.ResourceLocation;
 import net.minecraft.world.item.ItemStack;
 import net.minecraft.world.item.crafting.CraftingRecipe;
@@ -22,8 +22,19 @@ import net.minecraft.world.item.crafting.RecipeHolder;
 import java.util.List;
 
 class RecipeResolver implements IRecipeManagerPlugin {
-    private static final ResourceLocation RECIPE_ID = ResourceLocation.fromNamespaceAndPath(ComputerCraftAPI.MOD_ID, "upgrade");
+    private final UpgradeRecipeGenerator<RecipeHolder<CraftingRecipe>> resolver;
-    private final UpgradeRecipeGenerator<RecipeHolder<CraftingRecipe>> resolver = new UpgradeRecipeGenerator<>(x -> new RecipeHolder<>(RECIPE_ID, x), RecipeModHelpers.getEmptyRegistryAccess());
+
+    /**
+     * We need to generate unique ids for each recipe, as JEI will attempt to deduplicate them otherwise.
+     */
+    private int nextId = 0;
+
+    RecipeResolver(HolderLookup.Provider registries) {
+        resolver = new UpgradeRecipeGenerator<>(
+            x -> new RecipeHolder<>(ResourceLocation.fromNamespaceAndPath(ComputerCraftAPI.MOD_ID, "upgrade_" + nextId++), x),
+            registries
+        );
+    }
 
     @Override
     public <V> List<RecipeType<?>> getRecipeTypes(IFocus<V> focus) {
@@ -60,7 +71,7 @@ class RecipeResolver implements IRecipeManagerPlugin {
         return List.of();
     }
 
-    @SuppressWarnings({ "unchecked", "rawtypes" })
+    @SuppressWarnings({ "unchecked", "rawtypes", "UnusedVariable" })
     private static <T, U> List<T> cast(RecipeType<U> ignoredType, List<U> from) {
         return (List) from;
     }

projects/common/src/main/java/dan200/computercraft/shared/integration/RecipeModHelpers.java

@@ -15,7 +15,6 @@ import dan200.computercraft.shared.util.DataComponentUtil;
 import net.minecraft.core.Holder;
 import net.minecraft.core.HolderLookup;
 import net.minecraft.core.Registry;
-import net.minecraft.core.RegistryAccess;
 import net.minecraft.resources.ResourceKey;
 import net.minecraft.resources.ResourceLocation;
 import net.minecraft.world.item.ItemStack;
@@ -77,18 +76,6 @@ public final class RecipeModHelpers {
         return upgradeItems;
     }
 
-    /**
-     * A temporary function to denote places where we need a {@link HolderLookup.Provider} within our recipe mods, but
-     * don't have access to one.
-     *
-     * @return The empty recipe mod access.
-     * @deprecated We should get the registry access from a more sensible place.
-     */
-    @Deprecated
-    public static HolderLookup.Provider getEmptyRegistryAccess() {
-        return RegistryAccess.EMPTY;
-    }
-
     static <T> void forEachRegistry(HolderLookup.Provider registries, ResourceKey<Registry<T>> registry, Consumer<Holder.Reference<T>> consumer) {
         registries.lookup(registry).map(HolderLookup::listElements).orElse(Stream.empty()).forEach(consumer);
     }