#include <stdint.h>

typedef struct
{
    uint8_t cmd;
    union
    {
         unsigned ext:24;
         struct
         {
             uint8_t count;
             uint16_t __unused_00;
         };
    }
    union
    {
         uint32_t word;
         struct
         {
             uint8_t bank;
             unsigned offset:24;
         };
    };
}
map_header_cmd;

void*
seg_to_ram( int seg )
{
    void *seg_table = 0x80166FA8;

    if(seg == 0x80)
        return 0x80000000;

    seg &= 0xF;

    if(seg_table[seg])
        return seg_table[seg] | 0x80000000;

    return 0;
}

void
set_segment( int seg_n, void *ptr )
{
    uint32_t **dl_ptr;
    dl_ptr = (uint32_t*)(*(uint32_t*)(z_ctxt) + 0x2D0);
    **(*dl_ptr++) = 0xDB060000 | (seg_n * 4);
    **(*dl_ptr++) = (uint32_t)ptr;
    **(*dl_ptr++) = 0xE7000000;
    **(*dl_ptr++) = 0x00000000;
}

void
texture_bytecode(void *z_ctxt)
{
    map_header_cmd *map_ptr;
    void *(tex_func)( void *z_ctxt );

    for(
        map_ptr = (uint32_t*)(*(uint32_t*)(z_ctxt + 0x11CC8));
        map_ptr->cmd != 0x14;
        map_ptr++
    {
        if(map_ptr->cmd == 0xA
        && map_ptr->ext
        && map_ptr->bank)
            goto do_texture;
    }

    return;

  do_texture:
    tex_func = (void*)(map_ptr->ext + seg_to_ram(map_ptr->bank));
    tex_func( z_ctxt );
}