> > Finally, someone who knows the stuff :)) No, there is no such variable, > but this phrase I plucked from the comment. Here is an example from > radeon.h: > > /* CP vertex/indirect buffer data */ > unsigned long bufStart; /* Offset into AGP space */ > drmHandle bufHandle; /* Handle from drmAddMap */ > drmSize bufMapSize; /* Size of map */ > int bufSize; /* Size of buffers (in MB) */ > unsigned char *buf; /* Map */ > int bufNumBufs; /* Number of buffers */ > drmBufMapPtr buffers; /* Buffer map */ > > Now, from these I guess that *buf is where I can access the data directly > for Xserver. bufSize is the size of the thing - does it have to be in MB ? > Or just page-aligned is fine ? bufStart - what do I use this for ? Can I > use it to reference data in the buffer or do I have to add or subtract a > magic number from it before writing into card's registers ? (and to answer > your questions: I have made a copy of the same fields /with buf replaced > with capture and allocated space.. nothing seems to crash.., 3d workds, > 1mb is reserved someplace. /)
I'll check up & give you proper answers in a sec. However, it sounds like you're just looking to allocate a buffer of a meg or two on the card somewhere and use that for some purpose. If so, the 3d drivers are doing this all the time - to hold textures. You should be able to do the same thing - just grab a meg or two of texture memory and use that for your purposes. You'll need a trick or two to stop others grabbing it back when resources run low, but it is doable without modifying any kernel structures. Have a look at the files in lib/GL/mesa/src/drv/XYZ/*_tex*.[ch] and in particular functions like i810UploadTexImages() which scan the LRU and allocate memory. Keith _________________________________________________________ Do You Yahoo!? Get your free @yahoo.com address at http://mail.yahoo.com _______________________________________________ Dri-devel mailing list [EMAIL PROTECTED] https://lists.sourceforge.net/lists/listinfo/dri-devel
