kernel/src/framebuffer.asm

;; x, y, brightness
putpixel:
	push ebp
	mov ebp, esp

	push eax
	push ebx
	push ecx
	push edi

	cld

	; Destination
	mov edi, [mbootinfo.fb_addr]
	mov eax, [mbootinfo.fb_pitch]
	mul dword [ebp+12]   ;y
	add edi, eax

	mov eax, [ebp+8]   ;x
	movzx ebx, byte [mbootinfo.fb_bytespp]
	mul ebx
	add edi, eax


	; Brightness
	mov eax, [ebp + 16]

	; Poke videomemory
	stosb
	stosb
	stosb

	cmp [mbootinfo.fb_bpp], 24
	je .done
	stosb
.done:
	pop edi
	pop ecx
	pop ebx
	pop eax

	pop ebp
	ret