/**
 * HULK, the HOS Ultra Light Kernel.
 */
module hulk.hulk;

import hulk.header;
import hulk.bootinfo;
import hulk.framebuffer;
import hos.memory;
import ldc.attributes;
import hulk.kfont;

private __gshared Framebuffer fb;

extern extern(C) __gshared ubyte _hulk_total_size;

@(ldc.attributes.section(".hulk_header"))
private __gshared Header hulk_header = {
    &_hulk_total_size,
    &hulk_start,
};

/**
 * HULK entry point.
 *
 * @param bootinfo Pointer to HULK boot information structure.
 */
extern(C) void hulk_start(ulong rdi, ulong rsi, ulong rdx, BootInfo * bootinfo)
{
    fb.initialize(bootinfo.fb.buffer, bootinfo.fb.width, bootinfo.fb.height, bootinfo.fb.stride);
    fb.clear(0xFF8800u);

    for (size_t y = 100u; y < 120u; y++)
    {
        memset32(&bootinfo.fb.buffer[y * bootinfo.fb.stride + 20u], 0x001199u, 20u);
    }

    string message = "Hello, world! 0123456789!@#$%^&*()_-=+[]{};:\"'<>,./";
    int x = 100u;
    foreach (ch; message)
    {
        const(CharInfo) * ci = &kfont.chars[ch];
        fb.blit_alpha_bitmap(x + ci.left, 100 + ci.top - ci.height, ci.bitmap, ci.width, ci.height, 0x0088CCu);
        x += kfont.advance;
    }

    for (;;)
    {
    }
}