File: emxvga.c

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/*----------------------------------------------------------------------*\
 *  File:	emxvga.c                                        [emx+gcc]
 *
 *  Descript:	the SVGA display driver for DOS & OS/2
 *
 *  Library:	plplot
 *
 *  Requires:	emx0.9a + gcc 2.6.3
 *		svgakit/vesakit 1.7 (Johannes Martin)
 *
 *  Public:	plD_init_vga()
 *		plD_line_vga()
 *		plD_polyline_vga()
 *		plD_eop_vga()
 *		plD_bop_vga()
 *		plD_tidy_vga()
 *		plD_state_vga()
 *		plD_esc_vga()
 *
 *		pldummy_emxvga()
 *
 *  Private:	pause()
 *		vga_graphics()
 *		vga_text()
 *		g_mode_detect()
 *		fill_polygon()
 *
 *  Notes:
 *  0)  Since there is no *standard* graphics mode text output for emx,
 *	just draw a small carriage return <-| in the top-left corner.
 *
 *  1)	Supports 16 and 256 colour, VESA compliant, SVGA cards.
 *
 *  2)	uses `-geometry WxH+Xoff+Yoff` to force a screen resolution
 *	see g_mode_detect() for details.
 *
 *  3)	Uses color map 0, color map 1 colour selection, does polygon fills
 *
 *  Revisions:
 *   6 Jan 95	mjo	revised g_mode_detect() for 16 colour displays
 *			tested with emx0.9a
 *  14 Sep 94	mjo	uses <jmgraph.h>, PLD_emxvga controls inclusion
 *  13 Apr 94	mjo	documented (mj olesen)
 *   8 Jun 94	mjo	color map 0,1 color selection, color map 0,1
 *			state change (palette change), polygon fills.
\*----------------------------------------------------------------------*/
#include "plplot/plDevs.h"

#ifdef PLD_emxvga		/* (emx+gcc) */

#include "plplot/plplotP.h"		/* _read_kbd() in <stdlib.h> */
#include "plplot/drivers.h"
#include "plplot/plevent.h"
#include <jmgraph.h>

static void	pause	(void);
static void	vga_text	(PLStream *);
static void	vga_graphics	(PLStream *);
static int	g_mode_detect	(PLStream *);
static void	fill_polygon	(PLStream *);

typedef struct {
    short	isPageDirty;	/* track if something has been plotted */
    short	VESAmode;	/* the VESA mode number */
    short	xlen;		/* g_xsize - 1 */
    short	ylen;		/* g_ysize - 1 */
    short	ncol1;		/* Number of cmap 1 colors permitted */
    short	curcolor;	/* Current pen color */
} vgaDev;

/* -------------------------------------------------------------------- */

/* Initializes cmap 0 */
#define Cmap0Init(p)	\
	g_vgapal ((unsigned char *)((p)->cmap0), 0, (p)->ncol0, 0)

/* Initializes cmap 1 */
#define Cmap1Init(p)	\
	g_vgapal ((unsigned char *)((p)->cmap1), (p)->ncol0, \
		  ((vgaDev *)(p)->dev)->ncol1, 0)

#define PROMPT_COLOR	2	/* colour for pause, same as axis labels */

/*----------------------------------------------------------------------*\
 * g_mode_detect()
 *
 * try a variety of display resolutions
 * not exactly autodetect ... but something
 *
 * use `-geometry WxH+Xoff+Yoff` option to control video mode selection
 *
 *     W  width (X size)
 *     H  height (not used yet)
 *  Xoff  number of colours (16, 256)
 *  Yoff  video mode (decimal)
 *
 * To request a particular video resolution/colour combination
 * (and permit all lower resolutions as well):
 *	-geometry Wx?		(W = width, default to 256 colour)
 * or
 *	-geometry Wx?+Colour	(W = width, Xoff = Colour, 16 or 256)
 *
 * To request the highest video resolution for a particular colour:
 *	-geometry +Colour	(Xoff = Colour, 16 or 256)
 *
 * To request a particular video mode (use cautiously):
 *	-geometry +?+Mode	(Yoff = Mode)
 *
 * The default is equivalent to using "-geometry +256" 
 * i.e., choose the highest resolution 256 colour VESA mode.
\*----------------------------------------------------------------------*/
static int
g_mode_detect (PLStream *pls)
{
    int mode;
    vgaDev *dev = (vgaDev *) pls->dev;    

    /*
     * specify VESA mode exactly
     *   "-geometry +?+Mode"
     * where "Mode" is the VESA mode (decimal)
     */
    if ( pls->yoffset )
      {
	  mode = pls->yoffset;
	  if ( !g_mode (mode) )
	    {
		char msg[64];
		sprintf (msg,
			 "plD_init_vga: Couldn\'t set VESA mode %d (%#x).\n",
			 mode, mode);
		plexit (msg);
	    }
      }
    /*
     * specified the width (resolution) and/or number of colours,
     *   "-geometry Wx?+Colour"
     * or
     *   "-geometry +Colour"
     * where "Colour" is the number of colours (16 or 256)
     */
    else if ( pls->xoffset == 16 )
      {
	  switch ( pls->xlength )  /* order is important */
	    {
	     case 0:		/* real default */
	     case 1280:	if (g_mode (mode = G1280x1024x16))	break;
	     case 1024:	if (g_mode (mode = G1024x768x16))	break;
	     case 800:	if (g_mode (mode = G800x600x16))	break;
	     case 640:	if (g_mode (mode = G640x480x16))	break;
	     default:	mode = 0;	/* no vga card or bad size */
	    }
      }
    else			/* 256 colours */
      {
	  switch ( pls->xlength )  /* order is important */
	    {
	     case 0:		/* real default */
	     case 1280:	if (g_mode (mode = G1280x1024x256))	break;
	     case 1024:	if (g_mode (mode = G1024x768x256))	break;
	     case 800:	if (g_mode (mode = G800x600x256))	break;
	     case 640:  if (g_mode (mode = G640x480x256))	break;
	     case 320:	if (g_mode (mode = G320x200x256))	break;
	     default:	mode = 0;	/* no vga card or bad size */
	    }
      }

    dev->VESAmode = mode;
    dev->xlen = (pls->xlength = g_xsize) - 1;
    dev->ylen = (pls->ylength = g_ysize) - 1;
    dev->ncol1 = g_colors - pls->ncol0;	/* subtract colours already in cmap0 */
    if ( dev->ncol1 > pls->ncol1 )
      dev->ncol1 = pls->ncol1;
    return mode;
}


/*----------------------------------------------------------------------*\
 * plD_init_vga()
 *
 * Initialize device.
\*----------------------------------------------------------------------*/

void
plD_init_vga (PLStream *pls)
{
    vgaDev *dev;

    pls->termin = 1;		/* is an interactive terminal */
    pls->icol0 = 1;
    pls->width = 1;
    pls->bytecnt = 0;
    pls->page = 0;
    pls->graphx = 0;
    pls->dev_fill0 = 1;		/* Can do solid fills */

    if ( !pls->colorset )
      pls->color = 1;

    /* Allocate and initialize device-specific data */
    if ( pls->dev != NULL )
      free ((void *) pls->dev);

    pls->dev = calloc (1, (size_t) sizeof(vgaDev));
    if ( pls->dev == NULL )
      plexit ("plD_init_vga: Out of memory.");
    dev = (vgaDev *) pls->dev;

    if ( ! g_mode_detect (pls) )
      plexit ("plD_init_vga: No svga card?");
    
    plP_setpxl (3.0, 3.0);	/* pixels per mm */
    plP_setphy (0, dev->xlen, 0, dev->ylen);
    
    pls->graphx = 0;
    vga_graphics (pls);
}

/*----------------------------------------------------------------------*\
 * plD_line_vga()
 *
 * Draw a line in the current color from (x1,y1) to (x2,y2).
\*----------------------------------------------------------------------*/

void
plD_line_vga (PLStream *pls, short x1a, short y1a, short x2a, short y2a)
{
    vgaDev *dev = (vgaDev *) pls->dev;
    dev->isPageDirty = 1;
    g_line ((int) x1a, (int) (dev->ylen - y1a),
	    (int) x2a, (int) (dev->ylen - y2a),
	    dev->curcolor);
}

/*----------------------------------------------------------------------*\
 * plD_polyline_vga()
 *
 * Draw a polyline in the current color.
\*----------------------------------------------------------------------*/

void
plD_polyline_vga (PLStream *pls, short *xa, short *ya, PLINT npts)
{
    PLINT i;
    vgaDev *dev = (vgaDev *) pls->dev;

    dev->isPageDirty = 1;
    for (i = 0; i < npts - 1; i++)
      g_line ((int) xa[i],    (int) (dev->ylen - ya[i]),
	      (int) xa[i+1],  (int) (dev->ylen - ya[i+1]),
	      dev->curcolor);
}

/*----------------------------------------------------------------------*\
 * plD_eop_vga()
 *
 * End of page.
\*----------------------------------------------------------------------*/

void
plD_eop_vga (PLStream *pls)
{
    vgaDev *dev = (vgaDev *) pls->dev;
    if ( dev->isPageDirty )
      {
	  pause ();
	  g_clear (0);
	  dev->isPageDirty = 0;
      }
}

/*----------------------------------------------------------------------*\
 * plD_bop_vga()
 *
 * Set up for the next page.
 * Advance to next family file if necessary (file output).
\*----------------------------------------------------------------------*/

void
plD_bop_vga (PLStream *pls)
{
    pls->page++;
    plD_eop_vga (pls);
}

/*----------------------------------------------------------------------*\
 * plD_tidy_vga()
 *
 * Close graphics file or otherwise clean up.
\*----------------------------------------------------------------------*/

void
plD_tidy_vga (PLStream *pls)
{
    vga_text (pls);
    pls->page = 0;
    pls->OutFile = NULL;
}

/*----------------------------------------------------------------------*\
 * plD_state_vga()
 *
 * Handle change in PLStream state (color, pen width, fill attribute, etc).
\*----------------------------------------------------------------------*/

void
plD_state_vga (PLStream *pls, PLINT op)
{
    vgaDev *dev = (vgaDev *) pls->dev;

    switch (op)
      {
       case PLSTATE_WIDTH:	/* pen width */
	  break;

       case PLSTATE_COLOR0:	/* switch to a color from cmap 0 */
	  dev->curcolor = pls->icol0;
	  break;

       case PLSTATE_COLOR1:	/* switch to a color from cmap 1 */
	  dev->curcolor = ((pls->icol1 * (dev->ncol1 - 1))
			   / (pls->ncol1 - 1) + pls->ncol0);
	  break;

       case PLSTATE_FILL:	/* set area fill attribute */
	  break;

       case PLSTATE_CMAP0:	/* change to cmap 0 */
	  Cmap0Init (pls);
	  break;

       case PLSTATE_CMAP1:	/* change to cmap 1 */
	  Cmap1Init(pls);
	  break;
      }
}

/*----------------------------------------------------------------------*\
 * plD_esc_vga()
 *
 * Escape function.
 *
 * Functions:
 *	PLESC_TEXT	change to text mode
 *	PLESC_GRAPH	change to graphics mode
 *	PLESC_FILL	Fill polygon
 *
\*----------------------------------------------------------------------*/

void
plD_esc_vga (PLStream *pls, PLINT op, void *ptr)
{
    switch (op)
      {
       case PLESC_TEXT:
	  vga_text (pls);
	  break;

       case PLESC_GRAPH:
	  vga_graphics(pls);
	  break;

       case PLESC_FILL:
	  fill_polygon(pls);
	  break;
      }
}

/*----------------------------------------------------------------------*\
 * vga_graphics()
 *
 * Switch to graphis mode.
\*----------------------------------------------------------------------*/

static void
vga_graphics (PLStream *pls)
{
    vgaDev *dev = (vgaDev *) pls->dev;

    if ( !pls->graphx )
      {
	  g_mode (dev->VESAmode);
#if 0
	  plD_state_vga (pls, PLSTATE_CMAP0);	/* change to cmap 0 */
	  plD_state_vga (pls, PLSTATE_CMAP1);	/* change to cmap 1 */
#endif
	  Cmap0Init (pls);
	  Cmap1Init (pls);
	  /* colour map 1 */
	  if ( pls->curcmap )
	    {
		dev->curcolor = ((pls->icol1 * (dev->ncol1 - 1))
				 / (pls->ncol1 - 1) + pls->ncol0);
	    }
	  else
	    {
		dev->curcolor = pls->icol0;
	    }
	  pls->graphx = 1;
	  dev->isPageDirty = 0;
      }
}

/*----------------------------------------------------------------------*\
 * vga_text()
 *
 * Switch to text mode.
\*----------------------------------------------------------------------*/

static void
vga_text (PLStream *pls)
{
    vgaDev *dev = (vgaDev *) pls->dev;

    if ( pls->graphx )
      {
	  if ( dev->isPageDirty )
	    pause ();
	  g_mode (GTEXT);

	  pls->graphx = 0;
	  dev->isPageDirty = 0;
      }
}

/*----------------------------------------------------------------------*\
 * fill_polygon()
 *
 * Fill polygon described in points pls->dev_x[] and pls->dev_y[].
 * Only solid color fill supported.
\*----------------------------------------------------------------------*/

static void
fill_polygon (PLStream *pls)
{
    int x[PL_MAXPOLY], y[PL_MAXPOLY], n;
    vgaDev *dev = (vgaDev *) pls->dev;

    if (pls->dev_npts > PL_MAXPOLY)
      plexit ("Error -- too many points in polygon\n");

    for (n = 0; n < pls->dev_npts; n++)
      {
	  x[n] = (int) pls->dev_x[n];
	  y[n] = (int) (dev->ylen - pls->dev_y[n]);
      }

    g_polygon (x, y, n, (dev->curcolor), G_FILL);
}

/*----------------------------------------------------------------------*\
 * pause()
 *
 * Wait for a keystroke. - should have an "_osmode" hack for DOS vs. OS/2
 *
 * someday, real text
 * - but it works and no need to worry about loading fonts, etc.
\*----------------------------------------------------------------------*/

/* <-| prompt */
static const int Px[] = { 0x10, 0x10, 0x00, 0x20, 0x20 };
static const int Py[] = { 0x00, 0x10, 0x08, 0x08, 0x00 };

static void
pause (void)
{
    g_polygon (Px, Py, 3, PROMPT_COLOR, G_FILL);
    g_line (Px[2], Py[2], Px[3], Py[3], PROMPT_COLOR);
    g_line (Px[3], Py[3], Px[4], Py[4], PROMPT_COLOR);

    if ( ! _read_kbd (0,1,0) )
      _read_kbd (0,1,0);
}

#else
int
pldummy_emxvga (void)
{
    return 0;
}

#endif	/* PLD_emxvga */
/* --------------------- end of file (c source) -------------------- */