On 10/29/06, xiaoshuxing <[EMAIL PROTECTED]> wrote: > I mean, when the pipelines have finished rasterizing the vertices and > store the pixels into the framebuffer, all the data are in the memory, > nothing is displayed on the screen, my question is which function is invoked > to display those pixels on the screen so that we can see.
Ok, maybe I'm misunderstanding you, but the framebuffer *is* the screen. The video card has an engine which reads values from the framebuffer and generates a signal to update the screen. If the framebuffer is at address 0xA0000000 and you write a 0xFFFFFF to that location, you get a white pixel on the top-left corner of the screen (assume the video card has had the framebuffer appropriatly configured). Sometimes you have more than one framebuffer, so you write to one and then tell the video card to display that framebuffer from now on. There is always a current framebuffer. > I don't know whether I've show my problem clear or not. I just want to > learn how OpenGL interact with the graphics card and the Operating system > through this great work (Mesa) you've done. All the OS does is give access to the video card and the framebuffer, and the 3D engine simply draws to the framebuffer. That's all the OS needs to do really.... 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
