On 10/31/06, xiaoshuxing <[EMAIL PROTECTED]> wrote: > Thanks, this makes my head more clear, according to my understanding, there > needn't be any function to show the framebuffer to the screen, the video > card just know it, and do a refresh to display the buffer every time period.
The primary function of a video card is to read bytes from memory and convert them to display signals. Anything else recent video cards do is just bonus. > There's one more question, mesa simulates the framebuffer in memory, > traditionally, framebuffer should be some space on the video card so that > the video card knows where to read, how does mesa make a connection between > the self-defined framebuffer and the screen? It's called memory mapped I/O. There's plenty on the internet about it, so do a google search. The actual method used is mmap(), you can google for that too... http://en.wikipedia.org/wiki/Memory-mapped_I/O http://en.wikipedia.org/wiki/Mmap Basically, the memory actually is on the card, but the PCI bus, AGP bus, O/S, MMU, etc work together to make it look like the memory is part of your program. Have a nice day, -- Martijn van Oosterhout <[EMAIL PROTECTED]> http://svana.org/kleptog/ ------------------------------------------------------------------------- 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
