W liście z wto, 30-09-2003, godz. 22:02, Keith Whitwell pisze: > Jacek Rosik wrote: > > 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. > > This is my understanding also. We used to statically allocate the buffers, > but Mark V. changed it so the driver frees the memory for use as pixmap > cache/whatever when there are no active 3d contexts. > > This is less good in some respects than dynamically allocated private back and > depth buffers, but it has the nice effect of not crippling 2d when 3d is not > active. > > Keith
Is there a plan to move to dynamic allocation someday? Has anybody worked on it? Do all the drivers use this semi-static allocation scheme? -- 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
