NAME

       vga_blitwait - wait for any accelerator operation to finish

SYNOPSIS

       #include <vga.h>

       void vga_blitwait(void);

DESCRIPTION

       waits  for  any  accelerator operation to finish. Though already implemented not useful because these old
       style functions do not allow for parallel operation of the accelerator. A limited use might  be  to  wait
       for a running operation to complete in a signal(2) handler.

       This  is  an  old  style function to access the accelerator of an SVGA card. Before calling it you should
       check for availability of the function in the mode you use with vga_getmodeinfo(3).

       For new applications you might be better of trying to use vga_accel(3) instead.

       The  old  vga_bitblt(3),  vga_blitwait(3),  vga_fillblt(3),  vga_hlinelistblt(3),   and   vga_imageblt(3)
       interface was originally designed for the Cirrus chipsets. Then Mach32 added support too but has problems
       to  resemble  the unintuitive Cirrus interface. Then these new ideas were reinjected and vga_accel(3) was
       designed. Now Cirrus and Chips & Technologies chipset give limited vga_accel(3)  support  but  no  longer
       this old style support.  Mach32 is left to use the unintuitive Cirrus interface. At some future point the
       functions  might  be added for Mach32 too (which should be rather simple), so new applications should use
       the newer and probably more efficient interface.

       It would be fatal if the accelerator would be used while the console is switched away.   You  should  use
       vga_lockvc(3)  and  vga_unlockvc(3)  to  avoid  this,  although  good  implementations of the accelerator
       functions (like Mach32) will already ensure that.

       The testaccel(6) demo utilizes the old style accelerator functions.

SEE ALSO

       svgalib(7),  vgagl(7),  libvga.config(5),  testaccel(6),  vga_accel(3),  vga_bitblt(3),   vga_fillblt(3),
       vga_hlinelistblt(3), vga_imageblt(3), vga_getmodeinfo(3), vga_lockvc(3), vga_unlockvc(3)

AUTHOR

       This  manual  page  was  edited by Michael Weller <eowmob@exp-math.uni-essen.de>. The exact source of the
       referenced function as well as of the original documentation is unknown.

       It  is  very  likely  that  both  are  at  least  to   some   extent   are   due   to   Harm   Hanemaayer
       <H.Hanemaayer@inter.nl.net>.

       Occasionally  this  might  be wrong. I hereby asked to be excused by the original author and will happily
       accept any additions or corrections to this first version of the svgalib manual.

Svgalib (>= 1.2.11)                               27 July 1997                                   vga_blitwait(3)