The GameCube GPU is a complex, tight-knit piece of hardware with impressive features for its time. It is so powerful and so flexible, it was used unmodified within the Wii architecture. For a comparison, just imagine a SNES running with an NES's graphics system. This is completely unheard of, before or since. The GameCube is a remarkable achievement of hardware engineering! With its impressive capabilities, emulating the GameCube's GPU has been one of the most challenging tasks Dolphin has ever faced.
The Legend of Zelda: The Wind Waker is one of the most popular Gamecube games, if not Nintendo games, in existence. Its mixture of an open world, sharp dungeons, and an inventive art style turned heads more than ten years ago when it was released. Dolphin has had its share of problems with Wind Waker, but none could be so frustrating as its mishandling of the heat distortion.