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#ifndef MELVIX_VESA_H
#define MELVIX_VESA_H
#include <stdint.h>
#include "../system.h"
/**
* The CPUs response to the 0x4F00 call
* Used to receive the supported video modes
*/
struct vbe_info {
char signature[4];
uint32_t version;
struct far_ptr oem;
uint32_t capabilities;
struct far_ptr video_modes;
uint32_t video_memory;
uint32_t software_rev;
uint32_t vendor;
uint32_t product_name;
uint32_t product_rev;
char reserved[222];
char oem_data[256];
} __attribute__ ((packed));
/**
* The CPUs response to the 0x4F01 call
* Used to get information about a specific video mode code
*/
struct vbe_mode_info {
uint16_t attributes;
uint8_t window_a;
uint8_t window_b;
uint16_t granularity;
uint16_t window_size;
uint16_t segment_a;
uint16_t segment_b;
uint32_t win_func_ptr;
uint16_t pitch;
uint16_t width;
uint16_t height;
uint8_t w_char;
uint8_t y_char;
uint8_t planes;
uint8_t bpp;
uint8_t banks;
uint8_t memory_model;
uint8_t bank_size;
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;
uint32_t off_screen_mem_off;
uint16_t off_screen_mem_size;
uint8_t reserved1[206];
} __attribute__ ((packed));
/**
* Set the video mode to a specified resolution using
* a video mode code
* @param mode The requested video mode code from 0x4F00 call
* @return A structure with information about the video mode
*/
struct vbe_mode_info *vbe_set_mode(unsigned short mode);
/**
* Find the highest resolution using 0x4F00 and call
* vbe_set_mode using the video_modes far_ptr
*/
void set_optimal_resolution();
/**
* The current video mode
*/
int vbe_current_mode;
/**
* The width of the current video mode
*/
int vbe_width;
/**
* The height of the current video mode
*/
int vbe_height;
/**
* The bits per pixel of the current video mode
*/
int vbe_bpp;
/**
* The pitch (bytes per line) of the current video mode
*/
int vbe_pitch;
#endif
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