The most significant breakthrough of the DirectX 8 era was the introduction of . Before this, GPUs used a "fixed-function pipeline," meaning lighting and textures were hard-coded into the chip. Developers could only "tweak knobs" rather than write their own visual logic. Version 8.1 refined these features, expanding pixel shader versions (1.2, 1.3, and 1.4) to allow for more complex effects like realistic water reflections and dynamic shadows. 2. Foundation for the Original Xbox Microsoft DirectX 8.1 SDK full - Internet Archive
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