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Use UEFI Graphics Output Protocol (GOP)

hard7/8

Use UEFI Boot Services and Memory Map Read Files Using UEFI Simple File System Protocol

Language

Compiler

2.0s Limit 256MB

Submit and pass all tests to enable saving to GitHub.

Implementation

Simulate UEFI GOP framebuffer access in C.

Requirements:

Define EFI_GRAPHICS_OUTPUT_MODE_INFORMATION structure
Define GOP framebuffer with simulated memory
Implement gop_set_mode(width, height, format)
Implement gop_put_pixel(x, y, r, g, b)
Implement gop_fill_rect(x, y, w, h, color)
Implement gop_draw_gradient()
Show framebuffer base address and size
Show pixel format details
Calculate pixel offsets correctly
Show pixels_per_scanline vs width difference

Test:

Show mode set
Show pixel drawn
Show rectangle filled
Show gradient drawn
Show framebuffer info

Why This Matters

GOP is exactly what the Linux `efifb`/`simplefb` drivers and the GRUB2 graphical menu use to get an early framebuffer before a real GPU driver loads, replacing the bank-switched VGA modes int10h BIOS calls used to require. The pixels_per_scanline-vs-width distinction you implement here is a classic real bug: assuming stride equals width causes diagonal-tearing artifacts on GPUs that pad scanlines for alignment.

Hints

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Validation Suite

main.c

Workspace 1.0

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