caos-with-snake/drivers/vga.h

#pragma once

#include <stdint.h>

enum {
  VGA_ROWS = 25,
  VGA_COLS = 80,

  VGA_CTRL_REGISTER = 0x3d4,
  VGA_DATA_REGISTER = 0x3d5,
  VGA_OFFSET_LOW = 0x0f,
  VGA_OFFSET_HIGH = 0x0e,
};



unsigned vga_get_cursor();
unsigned vga_get_row_from_offset(unsigned offset);
unsigned vga_get_offset(unsigned col, unsigned row);
void vga_set_cursor(unsigned offset);

void vga_clear_screen();
void vga_set_char(unsigned offset, char c);
void vga_print_string(const char* s);

void vgaMode13();
void vgaMode3();