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78 lines
1.7 KiB
78 lines
1.7 KiB
// VGA Graphics Library
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#include "vga.h"
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#include "../kernel/io.h"
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#include "../lib/str.h"
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static unsigned int cursor_row = 0;
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static unsigned int cursor_col = 0;
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void vga_init() {
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// Disable cursor
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port_outb(0x3d4, 0x0a);
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port_outb(0x3d5, 0x20);
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// Clear screen
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// clear_screen();
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set_cursor_pos(0, 11);
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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(unsigned int col, unsigned int 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, unsigned int col, unsigned int 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(unsigned int col, unsigned int 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_screen() {
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for( int c = 0; c < MAX_COLS; c++ )
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for( int r = 0; r < MAX_ROWS; r++ )
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writechar(0x20, c, r, 0x0);
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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, (unsigned int)(c - str) + cursor_col, cursor_row, attribute_byte);
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}
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void println(char* str, int attribute_byte) {
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print(str, attribute_byte);
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cursor_row++; // Increment to next y-pos (newline)
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}
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void printalign(char* str, int attribute_byte, enum align alignment) {
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unsigned int strlenbuf = strlen(str);
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if( !alignment || alignment == LEFT ) {
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print(str, attribute_byte);
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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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}
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