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k.arts
07-30-2005, 10:05 AM
Hi there!
I hope this question isn't to much in hardware, but I'd like to know if anyone could make a statement on the internal use of pixel pipelines. Say for instance you want to let a fragment shader compute on some pixels. To ensure that only a fraction of all pixels are computed by the shader you use Scissoring. For example using that scissor mask you only draw a line of pixels. Will all the pixel pipelines be invoked? Or does the graphic hardware only work with rectangles of pixels?
Like this?
Pixel line:
xxxxxxxxx

Graphic card's work on pixels (16 pipelines)
xxxx
xxxx
xxxx
xxxx

If this would be true, then I'd think that most pipelines won't do anything.

Hope you know what I mean....

Thanks

Hirschi
07-30-2005, 11:16 PM
Hello.
I don't know if this link answers your question:

http://www-user.tu-chemnitz.de/~andy/haupt/3/Kapitel3.html

under paragraph 3.1.1 is a chart and a explaination how the pixel pipeline works.

arnecls
08-04-2005, 03:56 PM
I guess that strongly depends on what hardware you are using. In principle I would think that in both cases all pipelines are fully used but only ATI / nVidia can tell you for sure.

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