use map instead of linear search to find texture indices for animation

src/common/utility/tarray.h

@@ -1,4 +1,5 @@
 #pragma once
+#define TARRAY_H
 /*
 ** tarray.h
 ** Templated, automatically resizing array
@@ -943,6 +944,17 @@ template<class KT> struct THashTraits
 	int Compare(const KT left, const KT right) { return left != right; }
 };
 
+#ifdef TEXTUREID_H
+template<> struct THashTraits<FTextureID>
+{
+
+	hash_t Hash(const FTextureID key) { return (hash_t)key.GetIndex(); }
+
+	// Compares two keys, returning zero if they are the same.
+	int Compare(const FTextureID left, const FTextureID right) { return left != right; }
+};
+#endif
+
 template<> struct THashTraits<float>
 {
 	// Use all bits when hashing singles instead of converting them to ints.