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#pragma once
#include <stdlib.h>
#include "ports.h"
/*
* CGA (Colour Graphics Adapter)
*
* useful links:
* https://www.seasip.info/VintagePC/cga.html
* https://www.lowlevel.eu/wiki/Color_Graphics_Adapter
*
* TODO: switching between modes
* TODO: cursor styling
*/
class CGA : public Console {
public:
/* Hardware text mode colour constants. */
enum Colour : uint8_t {
CGA_COLOR_BLACK = 0,
CGA_COLOR_BLUE = 1,
CGA_COLOR_GREEN = 2,
CGA_COLOR_CYAN = 3,
CGA_COLOR_RED = 4,
CGA_COLOR_MAGENTA = 5,
CGA_COLOR_BROWN = 6,
CGA_COLOR_LIGHT_GREY = 7,
CGA_COLOR_DARK_GREY = 8,
CGA_COLOR_LIGHT_BLUE = 9,
CGA_COLOR_LIGHT_GREEN = 10,
CGA_COLOR_LIGHT_CYAN = 11,
CGA_COLOR_LIGHT_RED = 12,
CGA_COLOR_LIGHT_MAGENTA = 13,
CGA_COLOR_LIGHT_BROWN = 14,
CGA_COLOR_WHITE = 15,
};
CGA() = default;
~CGA() = default;
void set_buffer(uint32_t);
void set_colour(Colour fg, Colour bg);
void clear();
void enable_cursor(uint8_t start, uint8_t end);
void disable_cursor();
void update_cursor() override;
void write(char c) override;
void write(ViewIterator& iter) override;
struct Entry {
char c;
Colour fg : 4;
Colour bg : 4;
} __attribute((packed));
private:
const size_t max_columns = 80, max_rows = 25;
size_t column = 0, row = 0;
Colour colour_fg = CGA_COLOR_BLACK;
Colour colour_bg = CGA_COLOR_LIGHT_GREY;
Entry* buffer;
// ports
cga_idx_port p_idx;
cga_dat_port p_dat;
};
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