104 lines
2.5 KiB
C
104 lines
2.5 KiB
C
#ifndef COLORS_H
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#define COLORS_H
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#define VGA_WIDTH 80
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#define VGA_HEIGHT 25
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#define VGA_MEMORY_ADDRESS 0xB8000
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/* IN VGA - Video Memory Arrya:
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* short
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* 1s byte (left most) -> TEXT COLOR
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* 2s byte -> BACK COLOR
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* 3rd and 4rt byte -> TEXT (unsigned char) AKA CodePoint
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*/
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typedef struct __attribute__((packed)) _VGA {
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unsigned char codepoint; // 3rd and 4th byte
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unsigned char color; // 1st byte: text color, 2nd byte: background color
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// LAST BIT IS BLINKING FLAG
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} _VGA;
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typedef enum _VGA_COLOR {
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BLACK = 0x0,
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BLUE = 0x1,
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GREEN = 0x2,
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CYAN = 0x3,
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RED = 0x4,
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MAGENTA = 0x5,
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BROWN = 0x6,
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LIGHT_GREY = 0x7,
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DARK_GREY = 0x8,
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LIGHT_BLUE = 0x9,
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LIGHT_GREEN = 0xA,
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LIGHT_CYAN = 0xB,
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LIGHT_RED = 0xC,
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LIGHT_MAGENTA = 0xD,
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YELLOW = 0xE,
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WHITE = 0xF
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} _VGA_COLOR;
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typedef struct _VGA_screen_space{
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unsigned int line;
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unsigned int column;
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} _VGA_screen_space;
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static _VGA_screen_space cursor_pos = {0, 0};
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/*
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* END OF DECLARATIONS
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*/
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/*
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* START OF FUNCTIONS
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*/
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// Convert _VGA_COLOR to color byte
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static inline unsigned char __vga_color_byte(_VGA_COLOR fg, _VGA_COLOR bg, int blink) {
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unsigned char color = (bg << 4) | fg;
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if (blink) {
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color |= 0x80; // Set the blinking BIT
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// to the highest bit
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}
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return color;
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}
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// Get pointer to VGA memory
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static inline volatile _VGA* __vga_memory() {
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return (volatile _VGA*)VGA_MEMORY_ADDRESS;
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}
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static inline void __clear_screen() {
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volatile _VGA* vga = __vga_memory();
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for (int i = 0; i < VGA_WIDTH * VGA_HEIGHT; i++) {
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vga[i].codepoint = ' ';
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vga[i].color = __vga_color_byte(WHITE, BLACK, 0);
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}
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}
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static inline int __put_char_VGA_POS(_VGA _c, _VGA_screen_space _position, int _blink) {
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if(_position.line > VGA_HEIGHT || _position.column > VGA_WIDTH) return 0;
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volatile _VGA* vga = __vga_memory();
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vga[(_position.line * VGA_WIDTH) + _position.column].codepoint = _c.codepoint;
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vga[(_position.line * VGA_WIDTH) + _position.column].color = _c.color;
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return 1;
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}
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static inline int __put_char(int column, int line, unsigned codepoint, _VGA_COLOR foreground, _VGA_COLOR background, int _blink) {
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_VGA __temp_vga;
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__temp_vga.color = __vga_color_byte(foreground, background, _blink);
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__temp_vga.codepoint = codepoint;
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_VGA_screen_space __temp_vga_space;
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__temp_vga_space.column = column;
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__temp_vga_space.line = line;
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return __put_char_VGA_POS(__temp_vga, __temp_vga_space, _blink);
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}
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#endif
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