vga.h

#ifndef VGA_H
#define VGA_H

#include <stdint.h>
#include <stddef.h>

#define VGA_WIDTH 80
#define VGA_HEIGHT 25

/* VGA text colors */
enum vga_color {
    VGA_COLOR_BLACK = 0,
    VGA_COLOR_BLUE = 1,
    VGA_COLOR_GREEN = 2,
    VGA_COLOR_CYAN = 3,
    VGA_COLOR_RED = 4,
    VGA_COLOR_MAGENTA = 5,
    VGA_COLOR_BROWN = 6,
    VGA_COLOR_LIGHT_GREY = 7,
    VGA_COLOR_DARK_GREY = 8,
    VGA_COLOR_LIGHT_BLUE = 9,
    VGA_COLOR_LIGHT_GREEN = 10,
    VGA_COLOR_LIGHT_CYAN = 11,
    VGA_COLOR_LIGHT_RED = 12,
    VGA_COLOR_LIGHT_MAGENTA = 13,
    VGA_COLOR_LIGHT_BROWN = 14,
    VGA_COLOR_WHITE = 15,
};

/* Public API for the VGA text-mode driver */
uint8_t vga_entry_color(enum vga_color fg, enum vga_color bg);
uint16_t vga_entry(unsigned char uc, uint8_t color);

void vga_clear(void);
void vga_setcolor(uint8_t fg, uint8_t bg);
void vga_putc(char c);
void vga_puts(const char *s);

/* small helpers */
void vga_write_hex(uint32_t value);
void vga_write_dec(int32_t value);

/* initialize driver (clears screen) */
void vga_init(void);

#endif /* VGA_H */