vga.hxx

#ifndef __VGA_HXX__
#define __VGA_HXX__

#include <stdint.h> // ...
#include <stddef.h> // Compiler-provided header files.

namespace vga{

    enum color{ // Standard VGA colors.
        COLOR_BLACK = 0,
        COLOR_BLUE = 1,
        COLOR_GREEN = 2,
        COLOR_CYAN = 3,
        COLOR_RED = 4,
        COLOR_MAGENTA = 5,
        COLOR_BROWN = 6,
        COLOR_LIGHT_GREY = 7,
        COLOR_DARK_GREY = 8,
        COLOR_LIGHT_BLUE = 9,
        COLOR_LIGHT_GREEN = 10,
        COLOR_LIGHT_CYAN = 11,
        COLOR_LIGHT_RED = 12,
        COLOR_LIGHT_MAGENTA = 13,
        COLOR_LIGHT_BROWN = 14,
        COLOR_WHITE = 15
    };


    class vga{
    public:

        vga(); /* Constructor, sets up things such as the
              width and height of the VGA display. */

        void write(const char* data);
        /* Writes the specified string to the VGA display. Uses the
           current color scheme. */

        void write(const char* data, enum color fg, enum color bg);
        /* Writes the specified string to the VGA display.
           Takes colors as arguments to change the color scheme
           before writing. */

        void write(int val);

        // Mostly internal functions

        uint8_t make_color(enum color fg, enum color bg);

        /* Makes a color that can be written to the VGA memory. */

        uint16_t make_entry(char c, uint8_t color);

        /* Makes a character entry that can be written to VGA memory. */

        void putc(char c, int x, int y);

        /* Puts the character 'c' at positions 'x' and 'y' */

        void putc(char c);

        /* Puts the character 'c' at the current position. */

        void clear();

        /* Clears the screen all at once. */

        void clear(int line);

        /* Clears a specified line from the screen. */

        void nl();

        char* itoa(int value, int base);

    protected:
        int row; // Current character row.
        int column; // Current character column.
        uint8_t color; // Current colorscheme.

        int height; // Screen height.
        int width; // Screen width.

    private:
        uint16_t* buffer; // VGA memory.

    };
};

#endif