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- From: wiltzius@anduin.ocf.llnl.gov (Dave Wiltzius)
- Newsgroups: comp.sys.sgi.hardware
- Subject: Disk->frame buffer DMA?
- Message-ID: <145784@lll-winken.LLNL.GOV>
- Date: 12 Jan 93 05:02:39 GMT
- Sender: usenet@lll-winken.LLNL.GOV
- Organization: Lawrence Livermore Nat'l Lab.
- Lines: 22
- Nntp-Posting-Host: anduin.ocf.llnl.gov
-
-
- We are interested in retrieving raster images from disk (or a
- RAM DISK type device) into the frame buffer. Lets assume that
- the frame buffer window exactly matches the raster image
- dimensions on disk so no image processing is required. Is this
- possible without the raster image passing through the main
- memory?
-
- I would envision that this would be *similar* to the image file
- being mapped into the process' address space and some bitblt
- command (aka lrectwrite) would transfer the image to a window
- in the frame buffer. What I am asking for is the above, but
- without the raster image (disk file) being paged into memory
- but rather transferred (via DMA?) directly to the frame buffer.
-
- If this is not available, any plans for somesuch?
-
- Thanks. Please reply via email.
-
- Dave Wiltzius
- Lawrence Livermore Nat'l Lab
- wiltzius@llnl.gov
-