58 lines
1.7 KiB
Groff
58 lines
1.7 KiB
Groff
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.TH vga_setwritepage 3 "27 July 1997" "Svgalib (>= 1.2.11)" "Svgalib User Manual"
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.SH NAME
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vga_setwritepage \- set the 64K SVGA page number
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.SH SYNOPSIS
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.B "#include <vga.h>"
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.BI "void vga_setwritepage(int " page );
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.SH DESCRIPTION
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Usually SVGA cards have more than the 64K memory which suffice for an ordinary VGA.
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However, the memory window mapped at
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.BR vga_getgraphmem (3)
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is only 64K bytes large.
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.BR vga_setwritepage()
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selects the
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.IR page "-th"
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64K memory chunk to be visible for writes at position
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.BR vga_getgraphmem (3).
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.BR vga_setreadpage (3)
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allows a different 64K memory chunk to be modified by reads from this memory window. This
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is a very useful feature for screen to screen pixmap copies. However, not all cards support
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this in all graphics modes. Check
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.BR vga_modeinfo (3)
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for availability. Esp. as this feature can also not be used when in background mode.
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Of course, this function must be used in conjunction with
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.BR vga_setreadpage (3)
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but may not be used in conjunction with
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.BR vga_setpage (3).
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.SH SEE ALSO
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.BR svgalib (7),
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.BR vgagl (7),
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.BR libvga.config (5),
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.BR fun (6),
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.BR vgatest (6),
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.BR vga_getgraphmem (3),
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.BR vga_claimvideomemory (3),
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.BR vga_modeinfo (3)
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.BR vga_setpage (3),
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.BR vga_setreadpage (3),
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.BR vga_setlinearaddressing (3)
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.SH AUTHOR
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This manual page was edited by Michael Weller <eowmob@exp-math.uni-essen.de>. The
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exact source of the referenced function as well as of the original documentation is
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unknown.
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It is very likely that both are at least to some extent are due to
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Harm Hanemaayer <H.Hanemaayer@inter.nl.net>.
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Occasionally this might be wrong. I hereby
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asked to be excused by the original author and will happily accept any additions or corrections
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to this first version of the svgalib manual.
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