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100 lines
1.9 KiB
100 lines
1.9 KiB
// VGA Graphics Library
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#include "vga.h"
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#include "../lib/types.h"
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#include "../kernel/io.h"
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#include "../kernel/memory.h"
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#include "../lib/str.h"
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#include "../lib/conv.h"
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static uint cursor_row = 0;
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static uint cursor_col = 0;
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void vga_init() {
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// Disable cursor
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outb(0x3d4, 0x0a);
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outb(0x3d5, 0x20);
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// Clear screen
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// clear_row(0);
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// clear_screen();
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//set_cursor_pos(0, 0);
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}
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/*
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VGA & Memory Functions
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*/
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char* get_memory_charpos(uint col, uint row) {
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return (char*)(VGA_ADDRESS + 2*((row*80) + col));
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}
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void writechar(char c, uint col, uint row, int attribute_byte) {
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if( !attribute_byte )
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attribute_byte = DEFAULT_COLOR;
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char* mem = get_memory_charpos(col, row);
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*mem = c; // Write the character
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*(mem+1) = attribute_byte; // Write the attribute_byte
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}
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void set_cursor_pos(uint col, uint row) {
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cursor_col = col;
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cursor_row = row;
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}
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/*
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Graphics Functions
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*/
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void clear_row(uint row) {
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for( int c = 0; c < MAX_COLS; c++ )
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writechar(0x20, c, row, 0x0);
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}
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void clear_screen() {
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for( int r = 0; r < MAX_ROWS; r++ )
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clear_row(r);
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}
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/*
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General Printing Functions
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*/
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void print(char* str, int attribute_byte) {
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for( char* c = str; *c != '\0'; c++ )
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writechar(*c, (uint)(c - str) + cursor_col, cursor_row, attribute_byte);
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cursor_col += strlen(str);
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}
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void new_line() {
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cursor_row++;
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cursor_col = 0;
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}
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void println(char* str, int attribute_byte) {
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if( cursor_row >= MAX_ROWS ) {
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set_cursor_pos(0, 0);
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println(str, attribute_byte);
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return;
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}
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print(str, attribute_byte);
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new_line();
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}
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void printalign(char* str, int attribute_byte, enum align alignment) {
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uint strlenbuf = strlen(str);
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if( !alignment || alignment == LEFT ) {
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set_cursor_pos(0, cursor_row);
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} else if ( alignment == RIGHT ) {
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set_cursor_pos(MAX_COLS - strlenbuf, cursor_row);
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} else if ( alignment == MIDDLE ) {
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set_cursor_pos((MAX_COLS/2) - (strlenbuf/2), cursor_row);
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}
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print(str, attribute_byte);
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set_cursor_pos(0, cursor_row+1);
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}
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