Boss bar render event (#2701)

Allow control over increment height

patches/minecraft/net/minecraft/client/gui/GuiBossOverlay.java.patch

@@ -0,0 +1,22 @@
+--- ../src-base/minecraft/net/minecraft/client/gui/GuiBossOverlay.java
++++ ../src-work/minecraft/net/minecraft/client/gui/GuiBossOverlay.java
+@@ -35,13 +35,18 @@
+             for (BossInfoLerping bossinfolerping : this.field_184060_g.values())
+             {
+                 int k = i / 2 - 91;
++                net.minecraftforge.client.event.RenderGameOverlayEvent.BossInfo event =
++                        net.minecraftforge.client.ForgeHooksClient.bossBarRenderPre(scaledresolution, bossinfolerping, k, j, 10 + this.field_184059_f.field_71466_p.field_78288_b);
++                if (!event.isCanceled()) {
+                 GlStateManager.func_179131_c(1.0F, 1.0F, 1.0F, 1.0F);
+                 this.field_184059_f.func_110434_K().func_110577_a(field_184058_a);
+                 this.func_184052_a(k, j, bossinfolerping);
+                 String s = bossinfolerping.func_186744_e().func_150254_d();
+                 this.field_184059_f.field_71466_p.func_175063_a(s, (float)(i / 2 - this.field_184059_f.field_71466_p.func_78256_a(s) / 2), (float)(j - 9), 16777215);
+-                j += 10 + this.field_184059_f.field_71466_p.field_78288_b;
++                }
++                j += event.getIncrement();
+ 
++                net.minecraftforge.client.ForgeHooksClient.bossBarRenderPost(scaledresolution);
+                 if (j >= scaledresolution.func_78328_b() / 3)
+                 {
+                     break;

src/main/java/net/minecraftforge/client/ForgeHooksClient.java

@@ -1,5 +1,6 @@
 package net.minecraftforge.client;
 
+import static net.minecraftforge.client.event.RenderGameOverlayEvent.ElementType.BOSSINFO;
 import static net.minecraftforge.common.ForgeVersion.Status.BETA;
 import static net.minecraftforge.common.ForgeVersion.Status.BETA_OUTDATED;
 import static org.lwjgl.opengl.GL11.*;
@@ -22,6 +23,7 @@ import net.minecraft.client.audio.SoundManager;
 import net.minecraft.client.gui.FontRenderer;
 import net.minecraft.client.gui.GuiMainMenu;
 import net.minecraft.client.gui.GuiScreen;
+import net.minecraft.client.gui.ScaledResolution;
 import net.minecraft.client.model.ModelBiped;
 import net.minecraft.client.renderer.EntityRenderer;
 import net.minecraft.client.renderer.GlStateManager;
@@ -61,6 +63,7 @@ import net.minecraft.util.math.MathHelper;
 import net.minecraft.util.math.RayTraceResult;
 import net.minecraft.util.registry.IRegistry;
 import net.minecraft.util.text.TextFormatting;
+import net.minecraft.world.BossInfoLerping;
 import net.minecraft.world.IBlockAccess;
 import net.minecraft.world.World;
 import net.minecraft.world.biome.BiomeGenBase;
@@ -70,12 +73,14 @@ import net.minecraftforge.client.event.FOVUpdateEvent;
 import net.minecraftforge.client.event.GuiScreenEvent;
 import net.minecraftforge.client.event.ModelBakeEvent;
 import net.minecraftforge.client.event.MouseEvent;
+import net.minecraftforge.client.event.RenderGameOverlayEvent;
 import net.minecraftforge.client.event.RenderHandEvent;
 import net.minecraftforge.client.event.RenderWorldLastEvent;
 import net.minecraftforge.client.event.TextureStitchEvent;
 import net.minecraftforge.client.event.sound.PlaySoundEvent;
 import net.minecraftforge.client.model.IPerspectiveAwareModel;
 import net.minecraftforge.client.model.ModelLoader;
+import net.minecraftforge.client.model.animation.Animation;
 import net.minecraftforge.common.ForgeModContainer;
 import net.minecraftforge.common.ForgeVersion;
 import net.minecraftforge.common.ForgeVersion.Status;
@@ -652,4 +657,17 @@ public class ForgeHooksClient
         int angle = MathHelper.normalizeAngle(-(int)Math.round(Math.toDegrees(Math.atan2(rv.y, rv.x)) / 90) * 90, 360);
         return new BlockFaceUV(new float[]{ uMin, vMin, uMax, vMax }, angle);
     }
+
+    public static RenderGameOverlayEvent.BossInfo bossBarRenderPre(ScaledResolution res, BossInfoLerping bossInfo, int x, int y, int increment)
+    {
+        RenderGameOverlayEvent.BossInfo evt = new RenderGameOverlayEvent.BossInfo(new RenderGameOverlayEvent(Animation.getPartialTickTime(), res),
+                BOSSINFO, bossInfo, x, y, increment);
+        MinecraftForge.EVENT_BUS.post(evt);
+        return evt;
+    }
+
+    public static void bossBarRenderPost(ScaledResolution res)
+    {
+        MinecraftForge.EVENT_BUS.post(new RenderGameOverlayEvent.Post(new RenderGameOverlayEvent(Animation.getPartialTickTime(), res), BOSSINFO));
+    }
 }

src/main/java/net/minecraftforge/client/event/RenderGameOverlayEvent.java

@@ -2,6 +2,7 @@ package net.minecraftforge.client.event;
 
 import java.util.ArrayList;
 
+import net.minecraft.world.BossInfoLerping;
 import net.minecraftforge.fml.common.eventhandler.Cancelable;
 import net.minecraftforge.fml.common.eventhandler.Event;
 
@@ -31,7 +32,8 @@ public class RenderGameOverlayEvent extends Event
         HELMET,
         PORTAL,
         CROSSHAIRS,
-        BOSSHEALTH,
+        BOSSHEALTH, // All boss bars
+        BOSSINFO,    // Individual boss bar
         ARMOR,
         HEALTH,
         FOOD,
@@ -83,6 +85,63 @@ public class RenderGameOverlayEvent extends Event
         @Override public boolean isCancelable(){ return false; }
     }
 
+    public static class BossInfo extends Pre
+    {
+        private final BossInfoLerping bossInfo;
+        private final int x;
+        private final int y;
+        private int increment;
+        public BossInfo(RenderGameOverlayEvent parent, ElementType type, BossInfoLerping bossInfo, int x, int y, int increment)
+        {
+            super(parent, type);
+            this.bossInfo = bossInfo;
+            this.x = x;
+            this.y = y;
+            this.increment = increment;
+        }
+
+        /**
+         * @return The {@link BossInfoLerping} currently being rendered
+         */
+        public BossInfoLerping getBossInfo()
+        {
+            return bossInfo;
+        }
+
+        /**
+         * @return The current x position we are rendering at
+         */
+        public int getX()
+        {
+            return x;
+        }
+
+        /**
+         * @return The current y position we are rendering at
+         */
+        public int getY()
+        {
+            return y;
+        }
+
+        /**
+         * @return How much to move down before rendering the next bar
+         */
+        public int getIncrement()
+        {
+            return increment;
+        }
+
+        /**
+         * Sets the amount to move down before rendering the next bar
+         * @param increment The increment to set
+         */
+        public void setIncrement(int increment)
+        {
+            this.increment = increment;
+        }
+    }
+
     public static class Text extends Pre
     {
         private final ArrayList<String> left;