VESA Video Modes: Difference between revisions
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You'll want to look in the VESA VBE docs for these functions: |
You'll want to look in the VESA VBE docs for these functions: |
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;INT 0x10, AX=0x4F00 |
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: Get Controller Info. This is the one that returns the array of all supported video modes. |
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<verbatim> |
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<pre> |
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struct vbeControllerInfo { |
struct vbeControllerInfo { |
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char signature[4]; // == "VESA" |
char signature[4]; // == "VESA" |
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v86_bios(0x10, {ax:0x4f00, es:SEG(vib), di:OFF(vib)},&out); |
v86_bios(0x10, {ax:0x4f00, es:SEG(vib), di:OFF(vib)},&out); |
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if (out.ax!=0x004f) die("something wrong with VBE get info"); |
if (out.ax!=0x004f) die("something wrong with VBE get info"); |
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</ |
</pre> |
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;INT 0x10, AX=0x4F01 |
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: Get Mode Info. Call this for each member of the mode array to find out the details of that mode. |
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<pre> |
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<verbatim> |
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struct vbeModeInfo { |
struct vbeModeInfo { |
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short reserved2; |
short reserved2; |
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}; |
}; |
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</ |
</pre> |
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;__INT 0x10, AX=0x4F02__: Set Video Mode. Call this with the mode number you decide to use. |
;__INT 0x10, AX=0x4F02__: Set Video Mode. Call this with the mode number you decide to use. |
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== Will it work with Bochs ?== |
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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 |
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 |
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==How to pick the mode i wish ?== |
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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. |
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. |
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<pre> |
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<verbatim> |
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UInt16 findMode(int x, int y, int d) |
UInt16 findMode(int x, int y, int d) |
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return best; |
return best; |
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} |
} |
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</ |
</pre> |
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---- |
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==See Also== |
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===Threads=== |
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[[Category:Video]] |
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