Georg - Which version of Microwindows are you wanting to support? The blit architecture is entirely rewritten after the 0.92 version; thus your driver will be completely different depending on whether you're running the snapshot or 0.92. In 0.92, you'll write a blit entry point that will move bits from offscreen memory to the display, as well as handle many other blit cases, such as copying memory to memory, and screen-to-screen data. In the snapshot, you will only have to implement the Update entry point, which copies memory from offscreen to display, as all the memory blits are handled internally. I will answer your questions below once I know the version you're running.
Regards, Greg I want to extend the scr_djgr screen driver with blit support. In general I understand that there shall be an area of offscreen memory where Nano-X will write the screen data to. When done it will either call xxxx_blit() in version 0.92 to write to the screen or xxxx_update() with the 0.93pre-snapshot version. Where do I define the offscreen memory now? In the open function there is a psd->addr pointer. The scr_X11 driver makes a malloc to assign memory to psd->addr in the open function. However, the scr_svga driver sets this to null. Both drivers also use gen_allocatememgc() to allocate a second PSD. The scr_svga driver apparently does not need gen_mapmemgc() or gen_freememgc() though to support blitting. The function xxxx_blit() uses a source psd and a destination psd. The xxxx_update() function apparently just gets the source psd and then writes that data to the screen as the final destination. I guess somehow I have to define the offscreen memory for the source psd so I can blit the data to the screen i.e. the destination. Is that done with gen_allocatememgc() and do I have to set psd->addr to null in the open function then? Is gen_mapmemgc() required or can I drop that like the scr_svga driver? Is all this done differently with version 0.92 versus the snapshot version? Georg --------------------------------------------------------------------- To unsubscribe, e-mail: nanogui-unsubscr...@linuxhacker.org For additional commands, e-mail: nanogui-h...@linuxhacker.org
