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vga_setmodex(3) [centos man page]

vga_setmodeX(3) 						Svgalib User Manual						   vga_setmodeX(3)

NAME
vga_setmodeX - try to set Mode X-like memory organization SYNOPSIS
#include <vga.h> void vga_setmodeX(void); DESCRIPTION
Try to enable Mode X-like memory organization for 256 color modes using up to 256K of memory like 320x200x256 and 640x400x256. Modes like 320x240x256 etc. are Mode X-like by default. vga_modeinfo(3) lists which modes have Mode X memory layout. A mode X like memory layout means that memory is organized in four pages (set_page(3)) and that the top most pixel 0,1,2,3 are the first pixel in pages 0,1,2,3. Pixels 4,5,6,7 are than the second pixels in pages 0,1,2,3. The other, packed pixel, mode will have pixel 0,1,2,3 as pixel 0,1,2,3 in page 0 and so on. It will only use the next pages if the size of the first 64K page is exceeded. Most SVGA 256 color modes work this way. This is not guaranteed to work. Probably a new mode should be defined for planar 320x200x256. SEE ALSO
svgalib(7), vgagl(7), libvga.config(5), vgatest(6), vga_getmodeinfo(3), vga_setmode(3), vga_setpage(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_setmodeX(3)

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vga_setlinearaddressing(3)					Svgalib User Manual					vga_setlinearaddressing(3)

NAME
vga_setlinearaddressing - switch to linear addressing mode SYNOPSIS
#include <vga.h> int vga_setlinearaddressing(void); DESCRIPTION
Switch to linear addressing mode. This maps all (or most) of the SVGA memory at the position returned by vga_getgraphmem(3) (which will probably change by the call to vga_setlinearaddressing()). The vga_set*page(3) calls are no longer required. This ensures optimal perfor- mance, however the drawing functions of svgalib do not support this memory layout and not all cards support it (and not in all modes). Use vga_modeinfo(3) to check for availability of the function in a given mode. Furthermore, some cards (Cirrus) just enable this buffer at a fixed hardware address. For Cirrus it is mapped at 14MB so you should never used it if you have more than 14MB of memory (But how does an application know?). The Mach32 support for this is smarter. It makes this feature only available when it is safe to be used. To avoid all this problems you can use nolinear Inhibit use of a linear mmaped frame buffer. linear Allow (not enforce!) use of a linear mmaped frame buffer. in the /etc/vga/libvga.config file to disable the linear frame buffer if it cannot be used. Returns the size of the mapped framebuffer if successful (can be less than total video memory), -1 if not. The testlinear(6) demo shows the use of this feature (and if it works for you). SEE ALSO
svgalib(7), vgagl(7), libvga.config(5), testlinear(6), vga_modeinfo(3), vga_getgraphmem(3), vga_setpage(3), vga_setreadpage(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_setlinearaddressing(3)

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