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How does VGA render a frame?

Forum Graphic & Displays : Graphics Cards - How does VGA render a frame?

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Divine Love   04-24-2008 at 04:39:21 AM

Hi, everyone
I want to know how a 3d scene is rendered with a VGA and how and on which order the different components of a VGA (Shaders, Rop, TMU, ...) are involved in doing the job of rendering?
I know the answer may be too long, but I appreciate anyone giving some info about this?
Thanks in advance.

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Silver Graphics badge TheGreatGrapeApe   04-24-2008 at 05:00:52 AM
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Depends on the architecture, but how detailed an answer are you looking for?

General path is:

setup engine/assembler/sequencer/arbiter -> Pixel/Vertex/Geometry Shader -> TMU - ROP -> VRAM -> TMDS/RAMDAC -> Display.

Of course depending on what's done things can double back and go into caches, etc.

Best thing to do is pick an engine like the G80 or R600 and look at their Block Diagram it usually shows the possible pathways to/from components.

Almost always starts with a scheduler/sequencer and ends with the display method (TMDS for digital RAMDAC for Analogue).

These should give you an idea of the current designs;
http://www.beyond3d.com/content/reviews/1/5
http://www.beyond3d.com/content/reviews/16/5
http://www.techreport.com/articles.x/11211
http://techreport.com/articles.x/12458

Older designs are slightly more linear;
http://www.beyond3d.com/content/reviews/4/5
http://www.beyond3d.com/content/reviews/36/7

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Divine Love   04-24-2008 at 05:05:43 AM
- 0 +

Cool, that's excactly what I was looking for.
Thanks a million!!

Reply to Divine Love
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