VESA Video Modes: Difference between revisions
Consistent use of struct names (Names according to the vbe spec.)
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: Get Controller Info. This is the one that returns the array of all supported video modes.
<source lang="c">
struct
char signature[4]; // == "VESA"
short version; // == 0x0300 for VBE 3.0
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};
v86_bios(0x10, {ax:0x4f00, es:SEG(vib), di:OFF(vib)}, &out);
if (out.ax!=0x004f) die("Something wrong with VBE get info");
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<source lang="c">
struct
word attributes;
byte winA,winB;
Line 60:
VESA stopped assigning codes for video modes long ago -- instead they standardized a much better solution: you can query the video card for what modes it supports, and query it about the attributes of each mode. In your OS, you can have a function that you call with a desired width, height, and depth, and it returns the video mode number for it (or the closest match). Then, just set that mode
Here's a sample code, assuming you have a VirtualMonitor already ... Basically, you will scan the 'modes list' referenced by the
<source lang="c">
UInt16 findMode(int x, int y, int d)
{
struct
struct
UInt16 *modes;
int i;
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