/*
 * Mesa 3-D graphics library
 * Version:  4.1
 * 
 * Copyright (C) 1999  Brian Paul   All Rights Reserved.
 * 
 * Permission is hereby granted, free of charge, to any person obtaining a
 * copy of this software and associated documentation files (the "Software"),
 * to deal in the Software without restriction, including without limitation
 * the rights to use, copy, modify, merge, publish, distribute, sublicense,
 * and/or sell copies of the Software, and to permit persons to whom the
 * Software is furnished to do so, subject to the following conditions:
 * 
 * The above copyright notice and this permission notice shall be included
 * in all copies or substantial portions of the Software.
 * 
 * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS
 * OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
 * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT.  IN NO EVENT SHALL
 * BRIAN PAUL BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN
 * AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN
 * CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE.
 */

/*
 * DOS/DJGPP device driver v1.6 for Mesa
 *
 *  Copyright (C) 2002 - Borca Daniel
 *  Email : dborca@users.sourceforge.net
 *  Web   : http://www.geocities.com/dborca
 */


#include <stdlib.h>
#include <sys/segments.h>

#include "video.h"
#include "null.h"



static vl_mode *modes;

#define null_color_precision 8




static void null_blit_nop (void)
{
}



/* Desc: Attempts to detect VGA, check video modes and create selectors.
 *
 * In  : -
 * Out : mode array
 *
 * Note: -
 */
static vl_mode *null_init (void)
{
 static int m[][2] = {
        {320, 200},
        {320, 240},
        {400, 300},
        {512, 384},
        {640, 400},
        {640, 480},
        {800, 600},
        {1024, 768},
        {1280, 1024},
        {1600, 1200}
 };
 static int b[] = {
        8,
        15,
        16,
        24,
        32
 };

 unsigned int i, j, k;

 if (modes == NULL) {
    modes = malloc(sizeof(vl_mode) *
                   (1 + (sizeof(m) / sizeof(m[0]) * sizeof(b) / sizeof(b[0]))));

    if (modes != NULL) {
       for (k = 0, i = 0; i < sizeof(m) / sizeof(m[0]); i++) {
           for (j = 0; j < sizeof(b) / sizeof(b[0]); j++, k++) {
               modes[k].xres    = m[i][0];
               modes[k].yres    = m[i][1];
               modes[k].bpp     = b[j];
               modes[k].mode    = 0x4000;
               modes[k].scanlen = m[i][0] * ((b[j] + 7) / 8);
               modes[k].sel     = -1;
               modes[k].gran    = -1;
           }
       }
       modes[k].xres    = -1;
       modes[k].yres    = -1;
       modes[k].bpp     = -1;
       modes[k].mode    = 0xffff;
       modes[k].scanlen = -1;
       modes[k].sel     = -1;
       modes[k].gran    = -1;
    }
 }

 return modes;
}



/* Desc: Frees all resources allocated by VGA init code.
 *
 * In  : -
 * Out : -
 *
 * Note: -
 */
static void null_fini (void)
{
}



/* Desc: Attempts to enter specified video mode.
 *
 * In  : ptr to mode structure, refresh rate
 * Out : 0 if success
 *
 * Note: -
 */
static int null_entermode (vl_mode *p, int refresh)
{
 NUL.blit = null_blit_nop;

 return 0;

 (void)(p && refresh); /* silence compiler warning */
}



/* Desc: Restores to the mode prior to first call to null_entermode.
 *
 * In  : -
 * Out : -
 *
 * Note: -
 */
static void null_restore (void)
{
}



/* Desc: set one palette entry
 *
 * In  : color index, R, G, B
 * Out : -
 *
 * Note: uses integer values
 */
static void null_setCI_i (int index, int red, int green, int blue)
{
 (void)(index && red && green && blue); /* silence compiler warning */
}



/* Desc: set one palette entry
 *
 * In  : color index, R, G, B
 * Out : -
 *
 * Note: uses normalized values
 */
static void null_setCI_f (int index, float red, float green, float blue)
{
 float max = (1 << null_color_precision) - 1;

 null_setCI_i(index, (int)(red * max), (int)(green * max), (int)(blue * max));
}



/* Desc: state retrieval
 *
 * In  : parameter name, ptr to storage
 * Out : 0 if request successfully processed
 *
 * Note: -
 */
static int null_get (int pname, int *params)
{
 switch (pname) {
        default:
             params[0] = params[0]; /* silence compiler warning */
             return -1;
 }
 return 0;
}



/*
 * the driver
 */
vl_driver NUL = {
          null_init,
          null_entermode,
          NULL,
          null_setCI_f,
          null_setCI_i,
          null_get,
          null_restore,
          null_fini
};
