W liście z wto, 30-09-2003, godz. 19:29, Alan Hourihane pisze: > On Tue, Sep 30, 2003 at 07:21:14PM +0200, Jacek Rosik wrote: > > W liście z wto, 30-09-2003, godz. 18:52, Alan Hourihane pisze: > > > In radeon_dri.c in the TransitionTo2d/3d there's some offscreen memory > > > allocation going on for info->backArea and info->depthTexArea. > > > > > > The trouble is - I can't see anywhere where these allocations are actually > > > used. > > > > > > Are these leftovers ?? > > > > > > Alan. > > Hi > > > > These are used used by 3D driver back depth/stencil buffers and texture > > memory. This memory is reserved so it wont get overwritten by 2D driver. > > It is used by means of RADEONInfoRec::frontOffset, > > RADEONInfoRec::backOffset etc... It can be freed if no 3D is active. > > Not from what I can see. The allocation of back, depth/stencil is done > in radeon_driver.c before passing what's left onto the FBManager. These > areas are pointed to by info->backOffset, info->depthOffset and > info->textureOffset.
These offsets are only calculated. Only front buffer area is allocated, rest is left to be allocated only on demand. Memory manager is initialised to maximum possible memory then area for framebuffer is reserved. Lines necessary for other buffers is only calculated. (II) RADEON(0): Memory manager initialized to (0,0) (1152,8191) (II) RADEON(0): Reserved area from (0,864) to (1152,866) (II) RADEON(0): Largest offscreen area available: 1152 x 7325 > I don't see what purpose info->backArea and info->depthTexArea have. Believe me, recently I had quite a few chances to see contents of these areas and normally they are used by 2D apps (mainly XMMS ;)). So if we wont reserve them screen corruption may occur. > > BTW: As I'am working on stereo now I need to allocate additional > > buffers for left eye buffers. Currently I allocate them whenever > > TransitionTo3D is called, but I think it would be quite useful if I > > would add TransitionToStereo/Mono functions and allocate/free them then. > > I looked at DRICreatedrawable code but I have no clue how to check > > whether drawable is stereo (if it does make sense). I think I can do it > > by checking Visual, but no clue how to get it. Can someone give me some > > clues. > > Look in the CreateContext routines to see how to check visuals. > > Alan. THX Another question: Is there any reason why memory manager is initialised to pScrn->displayWidth width? Can it be allocated to pScrn->displayWidth*2? I know it must fit 8192x8192 area for radon. -- Jacek Rosik <[EMAIL PROTECTED]> ------------------------------------------------------- This sf.net email is sponsored by:ThinkGeek Welcome to geek heaven. http://thinkgeek.com/sf _______________________________________________ Dri-devel mailing list [EMAIL PROTECTED] https://lists.sourceforge.net/lists/listinfo/dri-devel
