NAME

       vga_setreadpage - set the 64K SVGA page number

SYNOPSIS

       #include <vga.h>

       void vga_setreadpage(int page);

DESCRIPTION

       Usually  SVGA cards have more than the 64K memory which suffice for an ordinary VGA.  However, the memory
       window mapped at vga_getgraphmem(3) is only 64K bytes large.  vga_setreadpage() selects the  page-th  64K
       memory chunk to be visible for reads at position vga_getgraphmem(3).

       vga_setwritepage(3)  allows  a different 64K memory chunk to be modified by writes to this memory window.
       This is a very useful feature for screen to screen pixmap copies. However, not all cards support this  in
       all graphics mode. Check vga_modeinfo(3) for availability. Esp. as this feature can also not be used when
       in background mode.

       Of  course,  this  function  must  be used in conjunction with vga_setwritepage(3) but may not be used in
       conjunction with vga_setpage(3).

SEE ALSO

       svgalib(7), vgagl(7), libvga.config(5), fun(6), vgatest(6), vga_claimvideomemory(3),  vga_getgraphmem(3),
       vga_modeinfo(3), vga_setpage(3), vga_setwritepage(3), vga_setlinearaddressing(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_setreadpage(3)