Improve perf of TextureHelper.textureExists (#292)

src/main/java/tconstruct/library/util/TextureHelper.java

@@ -1,6 +1,10 @@
 package tconstruct.library.util;
 
 import net.minecraft.client.Minecraft;
+import net.minecraft.client.resources.FallbackResourceManager;
+import net.minecraft.client.resources.IResourceManager;
+import net.minecraft.client.resources.IResourcePack;
+import net.minecraft.client.resources.SimpleReloadableResourceManager;
 import net.minecraft.util.ResourceLocation;
 
 import cpw.mods.fml.relauncher.Side;
@@ -13,9 +17,22 @@ public final class TextureHelper {
 
     @SideOnly(Side.CLIENT)
     public static boolean textureExists(ResourceLocation texture) {
+        final IResourceManager resMan = Minecraft.getMinecraft().getResourceManager();
+        if (resMan instanceof SimpleReloadableResourceManager simple) {
+            FallbackResourceManager fallback = simple.domainResourceManagers.get(texture.getResourceDomain());
+            if (fallback != null) {
+                for (IResourcePack rp : fallback.resourcePacks) {
+                    if (rp != null && rp.resourceExists(texture)) {
+                        return true;
+                    }
+                }
+                return false;
+            }
+        }
 
+        // Fallback
         try {
-            Minecraft.getMinecraft().getResourceManager().getAllResources(texture);
+            resMan.getAllResources(texture);
             return true;
         } catch (Throwable t) { // pokemon!
             return false;

src/main/resources/META-INF/TConstruct_at.cfg

@@ -40,4 +40,8 @@ public net.minecraft.server.management.ItemInWorldManager field_73087_g
 public net.minecraft.server.management.ItemInWorldManager field_73099_h
 # EntitySlime
 public net.minecraft.entity.monster.EntitySlime func_70799_a(I)V #setSlimeSize
+# SimpleReloadableResourceManager
+public net.minecraft.client.resources.SimpleReloadableResourceManager field_110548_a # domainResourceManagers
+# FallbackResourceManager
+public net.minecraft.client.resources.FallbackResourceManager field_110540_a # resourcePacks
 # needs to have a space at the end of every line or SS will derp