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/*******************************************************************************
 * draw.c - implementation for libggi-based drawing on the GNU/Linux
 *          framebuffer device.
 *
 * Copyright (c) 2006, Ira W. Snyder (devel@irasnyder.com)
 ******************************************************************************/

#include <ggi/ggi.h>
#include <stdio.h>
#include "draw.h"

/* Initialize GGI for drawing */
void draw_init ()
{
    /* Initialize the palette */
    palette[BLACK].r = 0;
    palette[BLACK].g = 0;
    palette[BLACK].b = 0;

    palette[RED].r = 0xffff;
    palette[RED].g = 0;
    palette[RED].b = 0;

    palette[GREEN].r = 0;
    palette[GREEN].g = 0xffff;
    palette[GREEN].b = 0;

    palette[BLUE].r = 0;
    palette[BLUE].g = 0;
    palette[BLUE].b = 0xffff;

    palette[WHITE].r = 0xffff;
    palette[WHITE].g = 0xffff;
    palette[WHITE].b = 0xffff;

    /* Intialize GGI itself */
    if (ggiInit () != 0)
    {
        printf ("Error initialising GGI!\n");
        exit (1);
    }

    /* Try to open the screen */
    if ((vis = ggiOpen (NULL)) == NULL)
    {
        printf ("Error opening visual!\n");
        ggiExit ();
        exit (1);
    }

    /* Try to set the screen mode */
    if (ggiSetSimpleMode (vis, GGI_AUTO, GGI_AUTO, 0, GT_AUTO))
    {
        printf ("Set the GGI_DISPLAY variable to the palemu!\n");
        exit (1);
    }

    /* load the palette to the screen */
    ggiSetPalette (vis, 0, 5, palette);
}

/* Close GGI when we're done drawing */
void draw_close ()
{
    ggiClose (vis);
    ggiExit ();
}

void draw_clearscreen ()
{
    ggiSetGCForeground (vis, BLACK);
    ggiFillscreen (vis);
    ggiFlush (vis);
}

void draw_putpixel (int x, int y, int color)
{
    ggiSetGCForeground (vis, color);
    ggiDrawPixel (vis, x, y);
    ggiFlush (vis);
}

void draw_box (int x, int y, int width, int height, int color)
{
    ggiSetGCForeground (vis, color);
    ggiDrawBox (vis, x, y, width, height);
    ggiFlush (vis);
}

void draw_line (int x1, int y1, int x2, int y2, int color)
{
    ggiSetGCForeground (vis, color);
    ggiDrawLine (vis, x1, y1, x2, y2);
    ggiFlush (vis);
}