The NEXT LAST R600 Rumours & Speculation Thread

Discussion in 'Pre-release GPU Speculation' started by Geo, Mar 1, 2007.

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  1. Jawed

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    rn

    http://en.wikipedia.org/wiki/Rn_(newsreader)

    on BSD Unix on JANET in the UK, technically. I should have rec.music stuff printed out on good old fashioned 132 character stave paper somewhere, I think:

    http://www.pdp8.net/images/greenbar.shtml

    with 5-line staves instead of solid blocks :grin:

    Jawed
     
  2. trinibwoy

    trinibwoy Meh
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    Well the slide says "Anti-aliasing is effectively a post-processing filter applied to each rendered frame". Are you saying that the filter could be run on the ROPs?
     
  3. Rys

    Rys PowerVR
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    That depends on the resolve being asked for (and in R6's case whether you think it's custom).
     
  4. 3vi1

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    Jawed is a shader running on a GPU from the futurrrree. :wink:

    Seriously, that guy has great comments. I've been lurking here for 3 years and I've always enjoyed his insight, cheers!


    On a side note, I've been wondering.. Since AMD is implementing a sound component, no doubt helped by the removal of the audio stack from previous versions of windows; what is the likelihood of AMD has implemented something like Creative's X-FI sound processor?

    Can we compare ring buses here, or am I jumping to conclusions?
     
  5. Razor1

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    How so? I know you probably know all about the r600 by now lol, are you saying its not really programmable? It kinda sounds that way cause of the drivers hint.
     
  6. Jawed

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    Only if you pretend the MI/SF pipeline doesn't exist. R600 has dedicated interpolators outside of the ALU pipeline. SF instructions always last 4 or 8 clocks, which makes finding MAD-ALU-issuable instructions tough (if you want 100% MAD ALU utilisation). Doable, but complicated.

    Hey, now that's good thinking. No idea! What a groovy idea if it is like that.

    RV610 could do as well. If it's four clocks per batch, then that'd be 16. Then R600 would be 64. I dunno actually...

    But your comment about threads has piqued my curiosity...

    Jawed
     
  7. Rys

    Rys PowerVR
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    I'm not saying anything, really :smile: And if I knew everything I'd be working for AMD. You can learn a hell of a lot about the chip from this thread though, and a bunch from Mr. Ashraf.
     
  8. Razor1

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    LOL man you know how much info has been in these r600 threads :lol: .
     
  9. Star_Hunter

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    Its the source of half the rumors on the internet.
     
  10. Jawed

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    The screendoor antialiasing patent:

    Sample-level screen-door transparency using programmable transparency sample masks

    refers to a "programmer-specified" sampling pattern. So the sample pattern can vary per pixel and the combination of MSAA and transparency AA samples can be defined. So that's the programmable bit, at least as far as the driver is concerned. Programmers won't get their hands on the oSampleMask function until after D3D10 it seems...

    But I have to admit, I interpreted the document to mean that the RBEs do the rest. I know screendoor isn't CFAA - but the "programmable" processing implied here makes the RBEs rather more fun than we're used to.

    A tough question: CFAA and HDR at the same time? Seems unlikely...

    Actually does anyone know what 24xCFAA's sample pattern is? That's "edge detect", which implies it's similar to CSAA, which could imply all the samples are within the pixel

    Jawed
     
  11. trinibwoy

    trinibwoy Meh
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    Not sure what you mean here, that G80's shared MI/SF pipeline will cause bubbles in the main MAD ALU?
     
  12. SirPauly

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    #3792 SirPauly, Apr 30, 2007
    Last edited by a moderator: Apr 30, 2007
  13. BRiT

    BRiT Verified (╯°□°)╯
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    Maybe it's just marketting-speak, but this slide hints at CFAA and HDR at the same time, no?

    As for the sampling pattern, that should be interesting to see. They only showed 16xCFAA.
     
    #3793 BRiT, Apr 30, 2007
    Last edited by a moderator: Apr 30, 2007
  14. Geeforcer

    Geeforcer Harmlessly Evil
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    To me, that slide says "Hey, we still support all this stuff as well" but it could very well mean "CFAA works with all this".
     
  15. Jawed

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    Yep it's possible - but major bubbles are meant to be rare.

    Remember that code segment? I found a way to schedule it on G80 so that there are no bubbles on the MAD ALU. Took a fair amount of to-ing and fro-ing...

    Jawed
     
  16. trinibwoy

    trinibwoy Meh
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    Based on Rys's comment I'm leaning towards CFAA happening on the ROPs (might as well use that since I've got nothing else to go on :)) The slides indicate to me that CFAA works by borrowing MSAA color samples from neighbouring pixels during the resolve. So that explains why it can affect non-edge pixels. But that essentially boils down to a blur since you're blending neighbouring pixel colors. That blurring could cause a loss of detail on an otherwise properly filtered (AF) texture. In terms of performance (I think) the ROPs would need the ability to read 8 FP16 samples per clock for 16xCFAA + HDR - maybe that's what all the bandwidth is for!

    Also, there doesn't seem to be any Z-trickery going on, just real color samples. So that's one obvious advantage there - it doesn't fall over when stencil shadows are used.
     
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  17. trinibwoy

    trinibwoy Meh
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    Hopefully it'll take less to-ing and fro-ing to efficiently schedule actual game code :razz:
     
  18. R300King!

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    http://www.vr-zone.com/?i=4935

     
  19. Mize

    Mize 3dfx Fan
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  20. Rangers

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    Wow only 6,000 is enough to supply a launch? That doesn't sound right. Especially for a $400 somewhat mainstream priced part..

    Nvidia is clueless with that Ultra OT, we've criticized ATI enough for it's stupid moves for sure.
     
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