[1.21.2] Fix various conflicting rendering elements

src/main/java/io/wispforest/owo/compat/rei/ReiUIAdapter.java

@@ -29,8 +29,13 @@ public ReiUIAdapter(Rectangle bounds, BiFunction<Sizing, Sizing, T> rootComponen
         this.adapter = OwoUIAdapter.createWithoutScreen(bounds.x, bounds.y, bounds.width, bounds.height, rootComponentMaker);
         this.adapter.inspectorZOffset = 900;
 
-        if (MinecraftClient.getInstance().currentScreen != null) {
-            ScreenEvents.remove(MinecraftClient.getInstance().currentScreen).register(screen -> this.adapter.dispose());
+        var screenWithREI = MinecraftClient.getInstance().currentScreen;
+
+        if (screenWithREI != null) {
+            ScreenEvents.remove(screenWithREI).register(screen -> this.adapter.dispose());
+            ScreenEvents.afterRender(screenWithREI).register((screen, drawContext, mouseX, mouseY, tickDelta) -> {
+                this.adapter.drawTooltip(drawContext, mouseX, mouseY, tickDelta);
+            });
         }
     }
 

src/main/java/io/wispforest/owo/mixin/ui/HandledScreenMixin.java

@@ -64,20 +64,6 @@ private void clearSlotScissors(DrawContext context, Slot slot, CallbackInfo ci)
         GlStateManager._disableScissorTest();
     }
 
-    // TODO: [1.21.2-Porting] Figure out f such is still needed and how to handle such
-//    @Inject(method = "drawSlotHighlight", at = @At(value = "HEAD"))
-//    private static void enableSlotDepth(DrawContext context, int x, int y, int z, CallbackInfo ci) {
-//        if (!owo$inOwoScreen) return;
-//        RenderSystem.enableDepthTest();
-//        context.getMatrices().translate(0, 0, 300);
-//    }
-//
-//    @Inject(method = "drawSlotHighlight", at = @At("TAIL"))
-//    private static void clearSlotDepth(DrawContext context, int x, int y, int z, CallbackInfo ci) {
-//        if (!owo$inOwoScreen) return;
-//        context.getMatrices().translate(0, 0, -300);
-//    }
-
     @ModifyVariable(method = "mouseClicked", at = @At(value = "INVOKE", target = "Lnet/minecraft/client/option/SimpleOption;getValue()Ljava/lang/Object;", ordinal = 0), ordinal = 3)
     private int doNoThrow(int slotId, @Local() Slot slot) {
         return (((Object) this instanceof BaseOwoHandledScreen<?, ?>) && slot != null) ? slot.id : slotId;

src/main/java/io/wispforest/owo/ui/base/BaseOwoHandledScreen.java

@@ -7,11 +7,13 @@
 import io.wispforest.owo.ui.util.DisposableScreen;
 import io.wispforest.owo.ui.util.UIErrorToast;
 import io.wispforest.owo.util.pond.OwoSlotExtension;
+import net.fabricmc.fabric.api.client.screen.v1.ScreenEvents;
 import net.minecraft.client.gui.DrawContext;
 import net.minecraft.client.gui.Element;
 import net.minecraft.client.gui.screen.Screen;
 import net.minecraft.client.gui.screen.ingame.HandledScreen;
 import net.minecraft.entity.player.PlayerInventory;
+import net.minecraft.item.ItemStack;
 import net.minecraft.screen.ScreenHandler;
 import net.minecraft.screen.slot.Slot;
 import net.minecraft.text.Text;
@@ -82,6 +84,10 @@ protected void init() {
                 this.build(this.uiAdapter.rootComponent);
 
                 this.uiAdapter.inflateAndMount();
+
+                ScreenEvents.afterRender(this).register((screen, drawContext, mouseX, mouseY, tickDelta) -> {
+                    if (this.uiAdapter != null) this.uiAdapter.drawTooltip(drawContext, mouseX, mouseY, tickDelta);
+                });
             } catch (Exception error) {
                 Owo.LOGGER.warn("Could not initialize owo screen", error);
                 UIErrorToast.report(error);
@@ -261,6 +267,63 @@ public void dispose() {
     @Override
     protected void drawBackground(DrawContext context, float delta, int mouseX, int mouseY) {}
 
+    @Override
+    protected void drawSlotHighlightBack(DrawContext context) {
+        context.push().translate(0, 0, this.getLayerZOffset(HandledScreenLayer.SLOT));
+        super.drawSlotHighlightBack(context);
+    }
+
+    @Override
+    protected void drawSlotHighlightFront(DrawContext context) {
+        super.drawSlotHighlightFront(context);
+        context.pop();
+    }
+
+    @Override
+    protected void drawItem(DrawContext context, ItemStack stack, int x, int y, @Nullable String amountText) {
+        context.push().translate(0, 0, this.getLayerZOffset(HandledScreenLayer.CURSOR_ITEM));
+        super.drawItem(context, stack, x, y, amountText);
+        context.pop();
+    }
+
+    @Override
+    protected void drawMouseoverTooltip(DrawContext context, int x, int y) {
+        context.push().translate(0, 0, this.getLayerZOffset(HandledScreenLayer.ITEM_TOOLTIP));
+        super.drawMouseoverTooltip(context, x, y);
+        context.pop();
+    }
+
+    /**
+     * Return the z-offset to apply to rendering the given {@code layer}
+     */
+    protected int getLayerZOffset(HandledScreenLayer layer) {
+        return layer == HandledScreenLayer.CURSOR_ITEM ? -6900 : 300;
+    }
+
+    /**
+     * Different layers of handled screen rendering, the z-offset
+     * of which can be adjusted in an owo screen using {@link #getLayerZOffset(HandledScreenLayer)}
+     */
+    protected enum HandledScreenLayer {
+        /**
+         * The items in all slots, along with the highlight
+         * of the hovered slot
+         */
+        SLOT,
+
+        /**
+         * The item currently held by the cursor. More specifically, any item
+         * rendered through the {@link #drawItem(DrawContext, ItemStack, int, int, String)} method
+         */
+        CURSOR_ITEM,
+
+        /**
+         * The tooltip of an item in a slot. More specifically, any tooltip
+         * rendered through {@link #drawMouseoverTooltip(DrawContext, int, int)}
+         */
+        ITEM_TOOLTIP
+    }
+
     public class SlotComponent extends BaseComponent {
 
         protected final Slot slot;
@@ -325,4 +388,4 @@ public void updateY(int y) {
             ((SlotAccessor) this.slot).owo$setY(y - BaseOwoHandledScreen.this.y);
         }
     }
-}
+}

src/main/java/io/wispforest/owo/ui/base/BaseOwoScreen.java

@@ -8,6 +8,7 @@
 import io.wispforest.owo.ui.inject.GreedyInputComponent;
 import io.wispforest.owo.ui.util.DisposableScreen;
 import io.wispforest.owo.ui.util.UIErrorToast;
+import net.fabricmc.fabric.api.client.screen.v1.ScreenEvents;
 import net.minecraft.client.gui.DrawContext;
 import net.minecraft.client.gui.Element;
 import net.minecraft.client.gui.screen.Screen;
@@ -91,6 +92,10 @@ protected void init() {
                 this.build(this.uiAdapter.rootComponent);
 
                 this.uiAdapter.inflateAndMount();
+
+                ScreenEvents.afterRender(this).register((screen, drawContext, mouseX, mouseY, tickDelta) -> {
+                    if (this.uiAdapter != null) this.uiAdapter.drawTooltip(drawContext, mouseX, mouseY, tickDelta);
+                });
             } catch (Exception error) {
                 Owo.LOGGER.warn("Could not initialize owo screen", error);
                 UIErrorToast.report(error);

src/main/java/io/wispforest/owo/ui/core/OwoUIAdapter.java

@@ -26,6 +26,12 @@
  * even if you choose to not use {@link io.wispforest.owo.ui.base.BaseOwoScreen}
  * you can always simply add it as a widget and get most of the functionality
  * working out of the box
+ * <p>
+ * To draw the UI tree managed by this adapter, call {@link OwoUIAdapter#render(DrawContext, int, int, float)}.
+ * Note that this does not draw the current tooltip of the UI - this must be done separately
+ * by invoking {@link #drawTooltip(DrawContext, int, int, float)}. If in a scenario with multiple adapters
+ * or other sources rendering UI elements to the screen, it is generally desirable to delay tooltip
+ * drawing until after all UI is drawn to avoid layering issues.
  *
  * @see io.wispforest.owo.ui.base.BaseOwoScreen
  */
@@ -180,8 +186,6 @@ public void render(DrawContext context, int mouseX, int mouseY, float partialTic
             GlStateManager._disableScissorTest();
             RenderSystem.disableDepthTest();
 
-            this.rootComponent.drawTooltip(owoContext, mouseX, mouseY, partialTicks, delta);
-
             final var hovered = this.rootComponent.childAt(mouseX, mouseY);
             if (!disposed && hovered != null) {
                 this.cursorAdapter.applyStyle(hovered.cursorStyle());
@@ -200,6 +204,22 @@ public void render(DrawContext context, int mouseX, int mouseY, float partialTic
         }
     }
 
+    /**
+     * Draw the current tooltip of the UI managed by this adapter. This method
+     * must not be called without a previous, corresponding call to {@link #render(DrawContext, int, int, float)}
+     *
+     *
+     * @since 0.12.19
+     */
+    public void drawTooltip(DrawContext context, int mouseX, int mouseY, float partialTicks) {
+        if (!(context instanceof OwoUIDrawContext)) context = OwoUIDrawContext.of(context);
+        var owoContext = (OwoUIDrawContext) context;
+
+        final var delta = MinecraftClient.getInstance().getRenderTickCounter().getLastFrameDuration();
+
+        this.rootComponent.drawTooltip(owoContext, mouseX, mouseY, partialTicks, delta);
+    }
+
     @Override
     public boolean isMouseOver(double mouseX, double mouseY) {
         return this.rootComponent.isInBoundingBox(mouseX, mouseY);

src/main/java/io/wispforest/owo/ui/layers/Layers.java

@@ -94,6 +94,10 @@ public static <S extends Screen, R extends ParentComponent> Layer<S, R> add(BiFu
                 for (var instance : getInstances(screen)) {
                     instance.adapter.render(context, mouseX, mouseY, tickDelta);
                 }
+
+                for (var instance : getInstances(screen)) {
+                    instance.adapter.drawTooltip(context, mouseX, mouseY, tickDelta);
+                }
             });
 
             ScreenMouseEvents.allowMouseClick(screeen).register((screen, mouseX, mouseY, button) -> {

src/main/resources/owo.accesswidener

@@ -9,4 +9,8 @@ transitive-accessible class net/minecraft/item/ItemGroup$EntriesImpl
 transitive-accessible class net/minecraft/client/gui/DrawContext$ScissorStack
 transitive-extendable method net/minecraft/client/gui/widget/CheckboxWidget <init> (IIILnet/minecraft/text/Text;Lnet/minecraft/client/font/TextRenderer;ZLnet/minecraft/client/gui/widget/CheckboxWidget$Callback;)V
 
-accessible class net/minecraft/registry/RegistryOps$CachedRegistryInfoGetter
+accessible class net/minecraft/registry/RegistryOps$CachedRegistryInfoGetter
+
+extendable method net/minecraft/client/gui/screen/ingame/HandledScreen drawSlotHighlightBack (Lnet/minecraft/client/gui/DrawContext;)V
+extendable method net/minecraft/client/gui/screen/ingame/HandledScreen drawSlotHighlightFront (Lnet/minecraft/client/gui/DrawContext;)V
+extendable method net/minecraft/client/gui/screen/ingame/HandledScreen drawItem (Lnet/minecraft/client/gui/DrawContext;Lnet/minecraft/item/ItemStack;IILjava/lang/String;)V