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drawingnasmprotected-mode

NASM drawing in protected mode

I seen that using interrupts it is only possible to draw on low resolution. Let's say that I am making simple OS that would display on any resolution, like 4k, 1920x1080. I have Intel x64 processor with Intel HD graphics and Nvidia card. I am on laptop

Solution

  • On IBM PC architecture video memory (framebuffer) is mapped to conventional memory so you can draw by direct writing to video memory. Here is a nice doc on that. But beware of screen flickering which happens when you write video memory at the moment of redrawing screen by videoadapter. In order to avoid this you can use double buffering technique which is described here.