gpu: fix anim array indexes with sparse texture array

Texture 54 doesn't exist and was causing everything after it to have its index off by 1

runelite-client/src/main/java/net/runelite/client/plugins/gpu/TextureManager.java

@@ -208,11 +208,14 @@ class TextureManager
 	{
 		Texture[] textures = textureProvider.getTextures();
 		float[] anims = new float[TEXTURE_SIZE * 2];
-		int idx = 0;
-		for (Texture texture : textures)
+		for (int i = 0; i < textures.length; ++i)
 		{
-			if (texture != null)
+			Texture texture = textures[i];
+			if (texture == null)
 			{
+				continue;
+			}
+
 			float u = 0f, v = 0f;
 			switch (texture.getAnimationDirection())
 			{
@@ -234,9 +237,8 @@ class TextureManager
 			u *= speed;
 			v *= speed;
 
-				anims[idx++] = u;
-				anims[idx++] = v;
-			}
+			anims[i * 2] = u;
+			anims[i * 2 + 1] = v;
 		}
 		return anims;
 	}