Add crafting overlay

src/main/kotlin/moe/nea/firmament/features/FeatureManager.kt

@@ -23,6 +23,7 @@ import kotlinx.serialization.serializer
 import moe.nea.firmament.Firmament
 import moe.nea.firmament.features.debug.DeveloperFeatures
 import moe.nea.firmament.features.fishing.FishingWarning
+import moe.nea.firmament.features.inventory.CraftingOverlay
 import moe.nea.firmament.features.inventory.SlotLocking
 import moe.nea.firmament.features.world.FairySouls
 import moe.nea.firmament.util.data.DataHolder
@@ -49,6 +50,7 @@ object FeatureManager : DataHolder<FeatureManager.Config>(serializer(), "feature
             loadFeature(FairySouls)
             loadFeature(FishingWarning)
             loadFeature(SlotLocking)
+            loadFeature(CraftingOverlay)
             if (Firmament.DEBUG)
                 loadFeature(DeveloperFeatures)
             hasAutoloaded = true

src/main/kotlin/moe/nea/firmament/features/inventory/CraftingOverlay.kt

@@ -0,0 +1,66 @@
+package moe.nea.firmament.features.inventory
+
+import net.minecraft.client.gui.screen.ingame.GenericContainerScreen
+import net.minecraft.item.ItemStack
+import net.minecraft.util.Formatting
+import moe.nea.firmament.events.SlotRenderEvents
+import moe.nea.firmament.features.FirmamentFeature
+import moe.nea.firmament.recipes.SBCraftingRecipe
+import moe.nea.firmament.rei.FirmamentReiPlugin.Companion.asItemEntry
+import moe.nea.firmament.rei.SBItemEntryDefinition
+import moe.nea.firmament.util.MC
+
+object CraftingOverlay : FirmamentFeature {
+
+    private var screen: GenericContainerScreen? = null
+    private var recipe: SBCraftingRecipe? = null
+    private val craftingOverlayIndices = listOf(
+        10, 11, 12,
+        19, 20, 21,
+        28, 29, 30,
+    )
+
+
+    fun setOverlay(screen: GenericContainerScreen, recipe: SBCraftingRecipe) {
+        this.screen = screen
+        this.recipe = recipe
+    }
+
+    override val name: String
+        get() = "Crafting Overlay"
+    override val identifier: String
+        get() = "crafting-overlay"
+
+    override fun onLoad() {
+        SlotRenderEvents.After.subscribe { event ->
+            val slot = event.slot
+            val recipe = this.recipe ?: return@subscribe
+            if (slot.inventory != screen?.screenHandler?.inventory) return@subscribe
+            val recipeIndex = craftingOverlayIndices.indexOf(slot.index)
+            if (recipeIndex < 0) return@subscribe
+            val expectedItem = recipe.neuRecipe.inputs[recipeIndex]
+            val actualStack = slot.stack ?: ItemStack.EMPTY!!
+            val actualEntry = SBItemEntryDefinition.getEntry(actualStack).value
+            if ((actualEntry.skyblockId.neuItem != expectedItem.itemId || actualEntry.stackSize < expectedItem.amount) && expectedItem.amount.toInt() != 0) {
+                event.context.fill(
+                    event.slot.x,
+                    event.slot.y,
+                    event.slot.x + 16,
+                    event.slot.y + 16,
+                    0x80FF0000.toInt()
+                )
+            }
+            if (!slot.hasStack()) {
+                val itemStack = SBItemEntryDefinition.getEntry(expectedItem).asItemEntry().value
+                event.context.drawItem(itemStack, event.slot.x, event.slot.y)
+                event.context.drawItemInSlot(
+                    MC.font,
+                    itemStack,
+                    event.slot.x,
+                    event.slot.y,
+                    "${Formatting.RED}${expectedItem.amount.toInt()}"
+                )
+            }
+        }
+    }
+}