boot/ppc/Vga.cc

/*
 * Copyright (c) 2008-2014, Pedigree Developers
 *
 * Please see the CONTRIB file in the root of the source tree for a full
 * list of contributors.
 *
 * Permission to use, copy, modify, and distribute this software for any
 * purpose with or without fee is hereby granted, provided that the above
 * copyright notice and this permission notice appear in all copies.
 *
 * THE SOFTWARE IS PROVIDED "AS IS" AND THE AUTHOR DISCLAIMS ALL WARRANTIES
 * WITH REGARD TO THIS SOFTWARE INCLUDING ALL IMPLIED WARRANTIES OF
 * MERCHANTABILITY AND FITNESS. IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR
 * ANY SPECIAL, DIRECT, INDIRECT, OR CONSEQUENTIAL DAMAGES OR ANY DAMAGES
 * WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR PROFITS, WHETHER IN AN
 * ACTION OF CONTRACT, NEGLIGENCE OR OTHER TORTIOUS ACTION, ARISING OUT OF
 * OR IN CONNECTION WITH THE USE OR PERFORMANCE OF THIS SOFTWARE.
 */

#include "Vga.h"
#include "ppc_font.c"
#include "prom.h"

const int width = 800;
const int height = 600;
const int bytes_per_pixel = 4;
// extern char *ppc_font;

extern void *prom_screen;

#define MAKE_16(r, g, b) (((r & 0x1f) << 11) | ((g & 0x1f) << 6) | (b & 0x1f))

void vga_putchar(
    char c, int x, int y, unsigned short f, unsigned short b,
    unsigned short *buf);

void vga_init()
{
    unsigned int addr;
    prom_getprop(prom_screen, "address", (void *) &addr, 4);
    //  writeHex(addr);

    // Set device depth here!

    prom_map(addr, 0xb0000000, 0x01000000);
    unsigned short *p = (unsigned short *) 0xb0000000;
    for (int i = 0; i < width * height; i++)
    {
        p[i] = MAKE_16(0, 0, 0);
    }
    for (int i = 0; i < 0x7f; i++)
    {
        vga_putchar(
            (char) i, (i * 8) % width, 16 * ((i * 8) / width),
            MAKE_16(i, 0xff, 0x7f - i), MAKE_16(0x00, 0x00, 0x00), p);
    }
}

#define FONT_HEIGHT 16
void vga_putchar(
    char c, int x, int y, unsigned short f, unsigned short b,
    unsigned short *buf)
{
    int idx = ((int) c) * 16;
    for (int i = 0; i < 16; i++)
    {
        unsigned char row = ppc_font[idx + i];
        for (int j = 0; j < 8; j++)
        {
            unsigned short col;
            if ((row & (0x80 >> j)) != 0)
            {
                col = f;
            }
            else
            {
                col = b;
            }
            buf[y * width + i * width + x + j] = col;
        }
    }
}