VESA Video Modes: Difference between revisions

You'll want to look in the VESA VBE docs for these functions:

 

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");

 

 

 

struct vbeModeInfo {

short reserved2;

};

 

;__INT 0x10, AX=0x4F02__: Set Video Mode. Call this with the mode number you decide to use.

 

 

For VBE to work in Bochs you need the "VGABIOS-lgpl" BIOS and have a version of Bochs that was compiled with the "--enable-vbe" option... See [Vesa Information in Bochs| Forum:6311] thread for more info

 

 

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;

}