2008/9/18, Francesco Poletti <[EMAIL PROTECTED]>: > > Ok, I got the answer...We are using the Jade Evaluation Board a new > evaluation board (from my_cable) for "Jade fujtsu" core > (http://www.fujitsu.com/emea/services/microelectronics/gdc/evalbds/jade-evalboard.html). > We are using a driver that does not exploit the GPU hardware acceleration. > Anyway I expected the the flip function to just swhitch a pointer, while, as > you explain us, it copy the shadow buffer into video memory. This is probably > because of our driver...isn't it?
You are right - the Flip() without blitting is function of the fbdev driver. I know two reasons why switching of the buffers can be disabled : fbdev is not support a panning function or your device (may be fault of fbdev too) has not enough video memory to allocate the shadow buffer. > So far I have a new question for you, how complex would be start > implementing some sort of hardware acceleration?Where can we find > documentation on how to do it?I mean about the directfb part, because we have > fully documentation about the GPU... Documentation for gfxdriver is source code of DirectFB.:) It's not a very difficult goal. See sources of some simple gfxdriver from the library. Too files src/core/gfxcard.h and gfxcard.c contain important comments. I spent couple of weeks to create my own driver. I did it so: 1) I'd created new folder in DirectFB/gfxdrivers/ 2) copied one of existing drivers sources to the folder (e.g. you can use ati128) 3) renamed all files, functions and structures (like as ati128Blit => xxxBlit) and corrected makefiles. 4) Next I'd changed followed functions : driver_probe(),driver_get_info(),driver_init_driver(), driver_init_device(), driver_close_device(), driver_close_driver() 5) When DirectFB could register my driver I'd begun to change check_state() and set_state() and create(change) gfx functions like as Blit, FillRect, Line and so on. Good luck! -- Best Regards Nikita Egorov [EMAIL PROTECTED] [EMAIL PROTECTED] _______________________________________________ directfb-users mailing list directfb-users@directfb.org http://mail.directfb.org/cgi-bin/mailman/listinfo/directfb-users
