.section .text.boot, "ax"
.global _start

_start:
    add x1, x0, #64
    ldr x2, [x1]            // base
    ldr x3, [x1, #16]       // width
    ldr x4, [x1, #24]       // height
    
    mul x5, x3, x4 
    mov x7, #5
    udiv x10, x5, x7        // stripe size

    // 0x00RRGGBB
    // lblue: 5B CE FA
    mov w11, #0xCEFA
    movk w11, #0x5B, lsl #16
    
    // pink: F5 A7 B8
    mov w12, #0xA7B8
    movk w12, #0xF5, lsl #16
    
    // white: FF FF FF
    mov w13, #0xFFFF
    movk w13, #0xFF, lsl #16

    mov x14, #0             // pixels in curr stripe
    mov x15, #0             // stripe index

fill_loop:
    cbz x5, done

    cmp x15, #0
    b.eq set_blue
    cmp x15, #1
    b.eq set_pink
    cmp x15, #2
    b.eq set_white
    cmp x15, #3
    b.eq set_pink
    b set_blue

set_blue:  mov w6, w11; b draw
set_pink:  mov w6, w12; b draw
set_white: mov w6, w13

draw:
    str w6, [x2], #4
    sub x5, x5, #1
    add x14, x14, #1

    cmp x14, x10
    b.lt fill_loop
    
    mov x14, #0
    add x15, x15, #1
    b fill_loop

done:
    b done