#ifndef MELVIX_VESA_H
#define MELVIX_VESA_H

#include <stdint.h>

typedef struct __attribute__ ((packed)) {
    uint16_t attributes;        // deprecated, only bit 7 should be of interest to you, and it indicates the mode supports a linear frame buffer.
    uint8_t window_a;            // deprecated
    uint8_t window_b;            // deprecated
    uint16_t granularity;        // deprecated; used while calculating bank numbers
    uint16_t window_size;
    uint16_t segment_a;
    uint16_t segment_b;
    uint32_t win_func_ptr;        // deprecated; used to switch banks from protected mode without returning to real mode
    uint16_t pitch;            // number of bytes per horizontal line
    uint16_t width;            // width in pixels
    uint16_t height;            // height in pixels
    uint8_t w_char;            // unused...
    uint8_t y_char;            // ...
    uint8_t planes;
    uint8_t bpp;            // bits per pixel in this mode
    uint8_t banks;            // deprecated; total number of banks in this mode
    uint8_t memory_model;
    uint8_t bank_size;        // deprecated; size of a bank, almost always 64 KB but may be 16 KB...
    uint8_t image_pages;
    uint8_t reserved0;

    uint8_t red_mask;
    uint8_t red_position;
    uint8_t green_mask;
    uint8_t green_position;
    uint8_t blue_mask;
    uint8_t blue_position;
    uint8_t reserved_mask;
    uint8_t reserved_position;
    uint8_t direct_color_attributes;

    uint32_t framebuffer;        // physical address of the linear frame buffer; write here to draw to the screen
    uint32_t off_screen_mem_off;
    uint16_t off_screen_mem_size;    // size of memory in the framebuffer but not being displayed on the screen
    uint8_t reserved1[206];
} vbe_mode_info;

vbe_mode_info *vbe_set_mode(unsigned short mode);

typedef struct __attribute__ ((packed)) {
    unsigned short di, si, bp, sp, bx, dx, cx, ax;
    unsigned short gs, fs, es, ds, eflags;
} regs16_t;

extern void int32(unsigned char intnum, regs16_t *regs);

int vbe_current_mode;
int vbe_width;
int vbe_height;
int vbe_bpp;
int vbe_pitch;

#endif