I'm following along with the Phil-Opp tutorials on creating an OS, and I'm trying to figure out how to control my display/screen, after having successfully gotten VGA output to work. How does one control the display? I'm assuming you have to write a driver... or do you write to specific memory locations like VGA? Would a crate like SDL2, Glium, or something else work on 'bare-metal'?
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Assuming you are in a 8bpp VGA graphics mode (such as Mode 0x13), you can write pixels directly to the screen by writing to memory addresses
0xA0000to0xB8000.