How do I set a graphics mode: Difference between revisions
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When a PC first boots up, it is set to a standard, known VGA text mode. But at some point you will want to start drawing pixels to the screen instead of text. This requires you to switch from text mode to a ''graphics'' mode. In 16-bit mode, you can easily use the BIOS to switch between different graphics modes by calling different functions of interrupt 0x10. Once you enter protected mode, however, things get a bit more difficult. |
When a PC first boots up, it is set to a standard, known VGA text mode. But at some point you will want to start drawing pixels to the screen instead of text. This requires you to switch from text mode to a ''graphics'' mode. In 16-bit mode, you can easily use the BIOS to switch between different graphics modes by calling different functions of interrupt 0x10. Once you enter protected mode, however, things get a bit more difficult. |
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== Using the UEFI == |
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For EFI, the standard was Universal Graphics Adapter, UGA. It had serious shortcomings (like not able to report framebuffer address), so in UEFI it was replaced by [[GOP|Graphics Output Protocol]] (GOP). |
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== Using the BIOS == |
== Using the BIOS == |
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