Keith Whitwell wrote: > We've just merged the texmem-0-3-branch code. This has been a major > project, probably much bigger than we realized when we started on it. > > The fundamental technology underpinning the changes is Thomas > Hellstrom's new TTM memory manager which dynamically maps buffers into > and out of the GART aperture as required for rendering. > > The benefits that flow from this are: > - Vastly increased amount of memory available for texturing. > - No need to reserve/waste memory for texture pool when not rendering. > - Fast transfers to *and* from video memory. > > As a result we've been able to build a whole bunch of features into the > i915tex driver that haven't been present in DRI-based drivers previously: > > - EXT_framebuffer_objects, render to texture > - ARB_pixel_buffer_objects > - Accelerated > - CopyTexSubimage > - DrawPixels > - ReadPixels > - CopyPixels > - Accelerated texture uploads from pixel buffer objects > - Potentially texturing directly from the pixel buffer object (zero > copy texturing). > > If/when other drivers are ported to the memory manager, it will be easy > to support VBO's in the same way. >
Hello, Nice work on the code and design ! It seems to me that this can really provide significant speedups for AGP access. Now, I'm interested in knowing what will happen next. In particular, I have two questions : - the current design always assumes that memory chunks are mapped into the process space, which is not always possible with, say, VRAM above 128Mb on radeon. If the design is to be unified, that's an assumption that can cause some trouble. How will that be done ? - second, no real solution was proposed for cards which have multiple hardware contexts (http://www.mail-archive.com/dri-devel@lists.sourceforge.net/msg28472.html). I expect this hardware model to be more widespread in the future. How should we handle it ? In my opinion, it's not only for supporting a single kind of hardware (in which case we'd happily write our own memory manager), but more about being future-proof. Stephane ------------------------------------------------------------------------- Using Tomcat but need to do more? Need to support web services, security? Get stuff done quickly with pre-integrated technology to make your job easier Download IBM WebSphere Application Server v.1.0.1 based on Apache Geronimo http://sel.as-us.falkag.net/sel?cmd=lnk&kid=120709&bid=263057&dat=121642 _______________________________________________ Mesa3d-dev mailing list Mesa3d-dev@lists.sourceforge.net https://lists.sourceforge.net/lists/listinfo/mesa3d-dev
