mirror of https://github.com/E-Almqvist/eOS
You can not select more than 25 topics
Topics must start with a letter or number, can include dashes ('-') and can be up to 35 characters long.
84 lines
1.8 KiB
84 lines
1.8 KiB
// VGA Graphics Library
|
|
#include "vga.h"
|
|
#include "../kernel/io.h"
|
|
#include "../lib/str.h"
|
|
|
|
// Memory
|
|
#define VGA_ADDRESS (char*)0xb8000
|
|
#define VGA_ADDRESS_MAX (char*)0xb8fa0
|
|
|
|
#define MAX_ROWS 25
|
|
#define MAX_COLS 80
|
|
|
|
static unsigned int cursor_row = 0;
|
|
static unsigned int cursor_col = 0;
|
|
|
|
void vga_init() {
|
|
// Disable cursor
|
|
port_outb(0x3d4, 0x0a);
|
|
port_outb(0x3d5, 0x20);
|
|
|
|
// Clear screen
|
|
clear_screen();
|
|
}
|
|
|
|
/*
|
|
VGA & Memory Functions
|
|
*/
|
|
char* get_memory_charpos(unsigned int col, unsigned int row) {
|
|
return (char*)(VGA_ADDRESS + 2*((row*80) + col));
|
|
}
|
|
|
|
void writechar(char c, unsigned int col, unsigned int row, int attribute_byte) {
|
|
if( !attribute_byte )
|
|
attribute_byte = 0x0f;
|
|
|
|
char* mem = get_memory_charpos(col, row);
|
|
*mem = c; // Write the character
|
|
*(mem+1) = attribute_byte; // Write the attribute_byte
|
|
|
|
}
|
|
|
|
void set_cursor_pos(unsigned int col, unsigned int row) {
|
|
cursor_col = col;
|
|
cursor_row = row;
|
|
}
|
|
|
|
|
|
/*
|
|
Graphics Functions
|
|
*/
|
|
void clear_screen() {
|
|
for( int c = 0; c < MAX_COLS; c++ )
|
|
for( int r = 0; r < MAX_ROWS; r++ )
|
|
writechar(0x20, c, r, 0xf0);
|
|
}
|
|
|
|
/*
|
|
General Printing Functions
|
|
*/
|
|
void print(char* str, int attribute_byte) {
|
|
for( char* c = str; *c != '\0'; c++ )
|
|
writechar(*c, (unsigned int)(c - str) + cursor_col, cursor_row, attribute_byte);
|
|
}
|
|
|
|
void println(char* str, int attribute_byte) {
|
|
print(str, attribute_byte);
|
|
cursor_row++; // Increment to next y-pos (newline)
|
|
}
|
|
|
|
void printalign(char* str, int attribute_byte, enum align alignment) {
|
|
unsigned int strlenbuf = strlen(str);
|
|
|
|
if( !alignment || alignment == LEFT ) {
|
|
print(str, attribute_byte);
|
|
} else if ( alignment == RIGHT ) {
|
|
set_cursor_pos(MAX_COLS - strlenbuf, cursor_row);
|
|
} else if ( alignment == MIDDLE ) {
|
|
set_cursor_pos((MAX_COLS/2) - (strlenbuf/2), cursor_row);
|
|
}
|
|
|
|
print(str, attribute_byte);
|
|
}
|
|
|
|
|
|
|