1vga_setreadpage(3)            Svgalib User Manual           vga_setreadpage(3)
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NAME

6       vga_setreadpage - set the 64K SVGA page number
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SYNOPSIS

9       #include <vga.h>
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11       void vga_setreadpage(int page);
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DESCRIPTION

15       Usually  SVGA  cards have more than the 64K memory which suffice for an
16       ordinary VGA.  However, the memory window mapped at  vga_getgraphmem(3)
17       is  only  64K  bytes  large.  vga_setreadpage() selects the page-th 64K
18       memory chunk to be visible for reads at position vga_getgraphmem(3).
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20       vga_setwritepage(3) allows a different 64K memory chunk to be  modified
21       by  writes  to  this  memory  window. This is a very useful feature for
22       screen to screen pixmap copies. However, not all cards support this  in
23       all graphics mode. Check vga_modeinfo(3) for availability. Esp. as this
24       feature can also not be used when in background mode.
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26       Of  course,  this  function  must   be   used   in   conjunction   with
27       vga_setwritepage(3)  but  may  not be used in conjunction with vga_set‐
28       page(3).
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SEE ALSO

32       svgalib(7),    vgagl(7),    libvga.config(5),    fun(6),    vgatest(6),
33       vga_claimvideomemory(3),  vga_getgraphmem(3), vga_modeinfo(3), vga_set‐
34       page(3), vga_setwritepage(3), vga_setlinearaddressing(3)
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AUTHOR

37       This manual page was edited  by  Michael  Weller  <eowmob@exp-math.uni-
38       essen.de>.  The  exact  source of the referenced function as well as of
39       the original documentation is unknown.
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41       It is very likely that both are at least to some extent are due to Harm
42       Hanemaayer <H.Hanemaayer@inter.nl.net>.
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44       Occasionally  this  might be wrong. I hereby asked to be excused by the
45       original author and will happily accept any additions or corrections to
46       this first version of the svgalib manual.
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50Svgalib (>= 1.2.11)              27 July 1997               vga_setreadpage(3)
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