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I'm talking about data containing pointers
Date: 6/27/14 4:46 am
In Response To: Re: Map files are memory mapped (uberfoop)

: Even if it's a memory image of sorts, if the data only requires 32-bit
: precision, wouldn't it be feasible to store it in a compact 32+32 format
: on the disc, and have the CPU (or perhaps GPU, really) unpack the data as
: it comes in? In addition to potentially saving disc space, I wouldn't be
: shocked if it reduced load times when there are large contiguous areas of
: data.

: Between the parallel processing capabilities of this hardware and the fact
: that these memory accesses would be highly patterned on a 68GB/s, I'd
: expect the HDD to be the bottleneck.

And texture data resides in the resource section of a map file, which isn't baked to be mapped to a specific memory address (and I'm not exactly sure what made you bring them up).

See "Cache files: Optimized resources for the Xbox" in

"When we build the final resource file, which we call a cache file, we simply dump all loaded tags into a giant buffer and write that out to a single file. At runtime, we just need to read that file into a fixed address before we start the level"

The tags, which are data structures, are where you would find pointers. Eg, the root of a render_model tag has a tag-block for the model's markers. That tag block, as of Halo4's tag system implementation, contains two pointers plus a 32-bit 'count' for the number of elements in the block. One of those pointers is the (fixed) memory address of the first element of that block (ie, the first marker).

Messages In This Thread

Life without Reach.Metalingus6276/26/14 9:06 am
     Re: Life without Reach.gamerguy20026/26/14 9:56 am
     Re: Life without Reach.Cody Miller6/26/14 12:39 pm
           Hehe. *NM*Ragashingo6/26/14 1:31 pm
     Just Wait For The Anniversary Editions.Morpheus6/26/14 8:05 pm
           I'll take 12! *NM*Kal6/26/14 9:39 pm
           Re: Just Wait For The Anniversary Editions.General Vagueness6/26/14 10:44 pm
     Disc spacekornman006/26/14 10:30 pm
           I agreeZackDark6/26/14 10:37 pm
                 I meant I agree with everything but that paragraph *NM*ZackDark6/26/14 10:37 pm
                 Map files are memory mappedkornman006/27/14 12:42 am
                       Re: Map files are memory mappeduberfoop6/27/14 12:55 am
                             I'm talking about data containing pointerskornman006/27/14 4:46 am
                                   Re: I'm talking about data containing pointersZackDark6/27/14 11:23 am
                                   Re: I'm talking about data containing pointersGeneral Vagueness6/27/14 12:25 pm
                                         Virtual Memorykornman006/27/14 6:25 pm
                                               Re: Virtual Memoryuberfoop6/27/14 7:34 pm

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