Backport MC-186052

src/main/java/org/dimdev/vanillafix/bugs/IPatched$TextureManager.java

@@ -0,0 +1,10 @@
+package org.dimdev.vanillafix.bugs;
+
+import net.minecraft.client.renderer.texture.ITextureObject;
+import net.minecraft.util.ResourceLocation;
+
+import java.util.Map;
+
+public interface IPatched$TextureManager {
+    Map<ResourceLocation, ITextureObject> getTextures();
+}

src/main/java/org/dimdev/vanillafix/bugs/mixins/client/MixinNetHandlerPlayClient.java

@@ -3,20 +3,37 @@
 import net.minecraft.client.Minecraft;
 import net.minecraft.client.gui.GuiScreen;
 import net.minecraft.client.network.NetHandlerPlayClient;
+import net.minecraft.client.renderer.GlStateManager;
+import net.minecraft.client.renderer.texture.AbstractTexture;
+import net.minecraft.client.renderer.texture.ITextureObject;
+import net.minecraft.client.renderer.texture.TextureManager;
 import net.minecraft.network.play.INetHandlerPlayClient;
+import net.minecraft.util.ResourceLocation;
+import net.minecraft.util.text.ITextComponent;
+import org.dimdev.vanillafix.bugs.IPatched$TextureManager;
 import org.spongepowered.asm.mixin.Mixin;
+import org.spongepowered.asm.mixin.Shadow;
 import org.spongepowered.asm.mixin.injection.At;
+import org.spongepowered.asm.mixin.injection.Inject;
 import org.spongepowered.asm.mixin.injection.Redirect;
+import org.spongepowered.asm.mixin.injection.callback.CallbackInfo;
+
+import java.util.Iterator;
+import java.util.Map;
 
 /**
  * Makes interdimensional teleportation nearly as fast as same-dimension
  * teleportation by removing the "Downloading terrain..." screen. This will cause
  * the player to see partially loaded terrain rather than waiting for the whole
  * render distance to load, but that's also the vanilla behaviour for same-dimension
  * teleportation.
+ *
+ * Forces {@link TextureManager} to unload all skins it has.
+ * See https://bugs.mojang.com/browse/MC-186052
  */
 @Mixin(value = NetHandlerPlayClient.class, priority = 500)
 public abstract class MixinNetHandlerPlayClient implements INetHandlerPlayClient {
+    @Shadow private Minecraft client;
 
     @Redirect(method = "handleJoinGame", at = @At(value = "INVOKE", target = "Lnet/minecraft/client/Minecraft;displayGuiScreen(Lnet/minecraft/client/gui/GuiScreen;)V"))
     private void onGuiDisplayJoin(Minecraft mc, GuiScreen guiScreenIn) {
@@ -27,4 +44,23 @@ private void onGuiDisplayJoin(Minecraft mc, GuiScreen guiScreenIn) {
     private void onGuiDisplayRespawn(Minecraft mc, GuiScreen guiScreenIn) {
         mc.displayGuiScreen(null);
     }
+
+    @Inject(method = "onDisconnect", at = @At("HEAD"))
+    private void onDisconnect(ITextComponent reason, CallbackInfo ci) {
+        TextureManager renderEngine = this.client.getTextureManager();
+        Map<ResourceLocation, ITextureObject> textures = ((IPatched$TextureManager)renderEngine).getTextures();
+        Iterator<Map.Entry<ResourceLocation, ITextureObject>> iterator = textures.entrySet().iterator();
+        while (iterator.hasNext()) {
+            Map.Entry<ResourceLocation, ITextureObject> entry = iterator.next();
+            if (entry.getKey().getPath().startsWith("skins/")) {
+                iterator.remove();
+                ITextureObject texture = entry.getValue();
+                if (texture instanceof AbstractTexture) {
+                    ((AbstractTexture) texture).deleteGlTexture();
+                } else {
+                    GlStateManager.deleteTexture(texture.getGlTextureId());
+                }
+            }
+        }
+    }
 }

src/main/java/org/dimdev/vanillafix/bugs/mixins/client/MixinTextureManager.java

@@ -0,0 +1,21 @@
+package org.dimdev.vanillafix.bugs.mixins.client;
+
+import net.minecraft.client.renderer.texture.ITextureObject;
+import net.minecraft.client.renderer.texture.TextureManager;
+import net.minecraft.util.ResourceLocation;
+import org.dimdev.vanillafix.bugs.IPatched$TextureManager;
+import org.spongepowered.asm.mixin.Final;
+import org.spongepowered.asm.mixin.Mixin;
+import org.spongepowered.asm.mixin.Shadow;
+
+import java.util.Map;
+
+@Mixin(TextureManager.class)
+public class MixinTextureManager implements IPatched$TextureManager {
+    @Shadow @Final private Map<ResourceLocation, ITextureObject> mapTextureObjects;
+
+    @Override
+    public Map<ResourceLocation, ITextureObject> getTextures() {
+        return mapTextureObjects;
+    }
+}

src/main/resources/mixins.vanillafix.bugs.json

@@ -23,7 +23,8 @@
     "client.MixinEntityRenderer",
     "client.MixinServerPinger$1",
     "client.MixinThreadDownloadImageData",
-    "client.MixinEnumConnectionState"
+    "client.MixinEnumConnectionState",
+    "client.MixinTextureManager"
   ],
   "injectors": {
     "maxShiftBy": 10