<!DOCTYPE html PUBLIC "-//W3C//DTD HTML 4.01 Transitional//EN"> <html> <head> <meta content="text/html;charset=ISO-8859-1" http-equiv="Content-Type"> <title></title> </head> <body bgcolor="#ffffff" text="#000000"> Adam Jackson wrote: <blockquote cite="mid200412302204.00197.ajax@nwnk.net" type="cite"> <pre wrap="">On Thursday 30 December 2004 21:44, Jon Smirl wrote: </pre> <blockquote type="cite"> <pre wrap="">I've been out of the DRI loop for a while since all I do is help feed and change two crying babies, but we also need think about the GL standalone case. libdrm is linked into the dri.so's so that they can be used standalone. Wouldn't another solution be to just fix the DRI.so's to not export the libdrm symbols? </pre> </blockquote> <pre wrap=""> Maybe. Depends on if the linker would choose to resolve the drm symbols from the server's libdrm module or from the ones linked statically into the driver. But then you still have two copies of the same code in the same process and attempting to use the same symbols, and to me that sounds like a design issue. </pre> <blockquote type="cite"> <pre wrap="">If we proceed down the X on GL path this problem would go away since X would stop using libdrm. </pre> </blockquote> <pre wrap=""> No, it won't. For X on GL, the server still loads a DRI driver. It's just already loaded early during eglCreateContext or whatever, rather than loaded explicitly by libglx. The server still needs to be a window system for the 5000 GLX applications that already exist, and we'll still want to be able to do accelerated indirect GLX. </pre> <blockquote type="cite"> <pre wrap="">Since I haven't looked at the code in a month, can someone remind me why X needs to directly access libdrm and not use a DRI interface? For example the whole drmOpen sequence of where X searches for and loads DRM drivers would just go away if we let the OS automatically load the drivers based on PCI IDs. The current Linux DRM driver supports this. </pre> </blockquote> <pre wrap=""> Several of the DDXes and libdri call into libdrm. I don't have a good enumeration of why they do that though. Even in an X-on-GL world, you need a server process, and that server will want to act as a GL renderer for indirect clients. Fixing libglx to use a DRI driver as the renderer (instead of GLcore) should in fact make an Xgl server simpler. </pre> </blockquote> In this discussion it's important to not forget non-OpenGL dri clients. Both lib810XvMC and libviaXvMC use libdrm code, but they actually symlink only needed source files from the libdrm source and compile them directly into the library. I see no reason, however, why they shouldn't be able to use a dynamic so instead. Common X server DDX calls to libdrm are: Open Authentication map adding / removal agp alloc / free / bind / unbind /map /unmap irq enabling / disabling locking / unlocking drmCommandWrite / Read for vendor-specific functionality. Some of these, but not all, can be done by the drm itself, as Jon mentions. /Thomas <blockquote cite="mid200412302204.00197.ajax@nwnk.net" type="cite"> <pre wrap="">- ajax </pre> <pre wrap=""> <hr width="90%" size="4"> _______________________________________________ xorg mailing list <a class="moz-txt-link-abbreviated" href="mailto:xorg@lists.freedesktop.org">xorg@lists.freedesktop.org</a> <a class="moz-txt-link-freetext" href="http://lists.freedesktop.org/mailman/listinfo/xorg">http://lists.freedesktop.org/mailman/listinfo/xorg</a> </pre> </blockquote> </body> </html>