/*  vga.h
 *  VGA
 *
 *  Responsible for VGA buffer control.
 */
#ifndef VGA_H
#define VGA_H
#define VGA_GRID_COLS 80
#define VGA_GRID_ROWS 25
#define DEFAULT_ATTRIBUTES 0x0F00 
#include <stdint.h>
#include <stdarg.h>
#include "io.h"
/*
 * CONSTANTS AND VARIABLES
 */

//Information on the VGA buffer
extern volatile uint16_t* const vga_buffer;

typedef struct vga_ctx_s {
    int cursor_col;
    int cursor_row;
    uint16_t attributes;
} vga_ctx_t;

//grid is top left origin. This is our cursor!
extern uint16_t vga_attributes; // Black background, White foreground
extern char_writer_t* default_vga;

/*
 * Functions
 */

//Clear the VGA buffer, context optional
void vga_clear_ctx(vga_ctx_t* ctx);
void vga_clear();
//Write character c to cursor
//Implements IO generic ASCII output
int vga_out(void* ctx, char c);


#endif