VESA Video Modes: Difference between revisions

;INT 0x10, AX=0x4F00

: Get Controller Info. This is the one that returns the array of all supported video modes.

struct vbeControllerInfo {

char signature[4]; // == "VESA"

v86_bios(0x10, {ax:0x4f00, es:SEG(vib), di:OFF(vib)}, &out);

if (out.ax!=0x004f) die("Something wrong with VBE get info");

 

;INT 0x10, AX=0x4F01

: Get Mode Info. Call this for each member of the mode array to find out the details of that mode.

 

struct vbeModeInfo {

word attributes;

short reserved2;

};

 

;INT 0x10, AX=0x4F02: Set Video Mode. Call this with the mode number you decide to use.

Here's a sample code, assuming you have a VirtualMonitor already ... Basically, you will scan the 'modes list' referenced by the vbeInfoBlock.videomodes[] and then call 'get mode info' for each mode. You can then compare width, height and colordepth of each mode with the desired one.

 

UInt16 findMode(int x, int y, int d)

{

return best;

}

 

==See Also==