Do graphic cards have instruction sets of their own?

Posted by Matt on Stack Overflow See other posts from Stack Overflow or by Matt
Published on 2009-11-08T20:32:41Z Indexed on 2010/04/28 7:23 UTC
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Do graphic cards have instruction sets of their own? I assume they do, but I have been wondering if it is proprietary or if there is some sort of open standard.

Is every GPU instruction preceded by a CPU instruction or is it seamless? That is does OpenGL or DirectX call on the driver layer via the CPU which then sends a GPU instruction down the bus or is it more elaborate.

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