/*
 * Copyright (C) 2017 Robin Krahl <robin.krahl@ireas.org>
 * 
 * This program is free software: you can redistribute it and/or modify it
 * under the terms of the GNU General Public License as published by the Free
 * Software Foundation, either version 3 of the License, or (at your option)
 * any later version.
 *
 * This program is distributed in the hope that it will be useful, but WITHOUT
 * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
 * FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License for
 * more details.
 */

#include <garmos/arch.h>
#include <garmos/types.h>
#include <garmos/vga.h>

#ifndef VGA_MEMORY
#define VGA_MEMORY 0xB8000
#endif

void vga_clear(void)
{
	uint32_t i;

	for (i = 0; i < VGA_ROWS * VGA_COLS; i += 2)
		regset8(VGA_MEMORY + i, 0);
}

void vga_pclear(uint8_t attr)
{
	uint32_t i;

	for (i = 0; i < VGA_ROWS * VGA_COLS; i += 2) {
		regset8(VGA_MEMORY + i, 0);
		regset8(VGA_MEMORY + i + 1, attr);
	}
}

void vga_print(uint32_t row, uint32_t col, uint8_t c)
{
	uint32_t i = 2 * (row * VGA_COLS + col);

	if (row >= VGA_ROWS || col >= VGA_COLS)
		return;

	regset8(VGA_MEMORY + i, c);
}

void vga_pprint(uint32_t row, uint32_t col, uint8_t attr, uint8_t c)
{
	uint32_t i = 2 * (row * VGA_COLS + col);

	if (row >= VGA_ROWS || col >= VGA_COLS)
		return;

	regset8(VGA_MEMORY + i, c);
	regset8(VGA_MEMORY + i + 1, attr);
}