#ifndef MELVIX_VESA_H
#define MELVIX_VESA_H

#include <stdint.h>

struct vbe_best {
    uint8_t bpp;
    uint16_t height;
    uint16_t width;
    uint32_t framebuffer;
    uint32_t bytes_per_line;
    uint32_t bytes_per_pixel;
    uint32_t x_cur_max;
    uint32_t y_cur_max;
} __attribute__ ((packed));

struct vbe_info {
    char signature[4];    // must be "VESA" to indicate valid VBE support
    uint16_t version;            // VBE version; high byte is major version, low byte is minor version
    uint32_t oem;            // segment:offset pointer to OEM
    uint32_t capabilities;        // bitfield that describes card capabilities
    uint32_t video_modes;        // segment:offset pointer to list of supported video modes
    uint16_t video_memory;        // amount of video memory in 64KB blocks
    uint16_t software_rev;        // software revision
    uint32_t vendor;            // segment:offset to card vendor string
    uint32_t product_name;        // segment:offset to card model name
    uint32_t product_rev;        // segment:offset pointer to product revision
    char reserved[222];        // reserved for future expansion
    char oem_data[256];        // OEM BIOSes store their strings in this area
} __attribute__ ((packed));

struct vbe_mode_info {
    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];
} __attribute__ ((packed));

#endif