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palanim.cpp

/* ScummVM - Scumm Interpreter
 * Copyright (C) 2004 Ivan Dubrov
 * Copyright (C) 2004-2005 The ScummVM project
 *
 * 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 2
 * 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.

 * You should have received a copy of the GNU General Public License
 * along with this program; if not, write to the Free Software
 * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301, USA.
 *
 * $Header: /cvsroot/scummvm/scummvm/gob/palanim.cpp,v 1.10.2.1 2005/10/18 02:11:18 sev Exp $
 *
 */
#include "gob/gob.h"
#include "gob/video.h"
#include "gob/util.h"
#include "gob/global.h"
#include "gob/palanim.h"

namespace Gob {

int16 pal_fadeValue = 1;

byte pal_toFadeRed[256];
byte pal_toFadeGreen[256];
byte pal_toFadeBlue[256];

char pal_fadeColor(char from, char to) {
      if ((int16)from - pal_fadeValue > (int16)to)
            return from - pal_fadeValue;
      else if ((int16)from + pal_fadeValue < (int16)to)
            return from + pal_fadeValue;
      else
            return to;
}

char pal_fadeStep(int16 oper) {
      byte newRed;
      byte newGreen;
      byte newBlue;
      char stop;
      int16 i;

      if (colorCount != 256)
            error("pal_fadeStep: Only 256 color mode is supported!");

      if (oper == 0) {
            stop = 1;
            if (setAllPalette) {
                  if (inVM != 0)
                        error("pal_fade: inVM != 0 not supported.");

                  for (i = 0; i < 256; i++) {
                        newRed =
                            pal_fadeColor(redPalette[i],
                            pal_toFadeRed[i]);
                        newGreen =
                            pal_fadeColor(greenPalette[i],
                            pal_toFadeGreen[i]);
                        newBlue =
                            pal_fadeColor(bluePalette[i],
                            pal_toFadeBlue[i]);

                        if (redPalette[i] != newRed
                            || greenPalette[i] != newGreen
                            || bluePalette[i] != newBlue) {

                              vid_setPalElem(i, newRed, newGreen, newBlue, 0, 0x13);

                              redPalette[i] = newRed;
                              greenPalette[i] = newGreen;
                              bluePalette[i] = newBlue;
                              stop = 0;
                        }
                  }
            } else {
                  for (i = 0; i < 16; i++) {

                        vid_setPalElem(i,
                            pal_fadeColor(redPalette[i],
                              pal_toFadeRed[i]),
                            pal_fadeColor(greenPalette[i],
                              pal_toFadeGreen[i]),
                            pal_fadeColor(bluePalette[i],
                              pal_toFadeBlue[i]), -1, videoMode);

                        if (redPalette[i] != pal_toFadeRed[i] ||
                            greenPalette[i] != pal_toFadeGreen[i] ||
                            bluePalette[i] != pal_toFadeBlue[i])
                              stop = 0;
                  }
            }
            return stop;
      } else if (oper == 1) {
            stop = 1;
            for (i = 0; i < 16; i++) {
                  vid_setPalElem(i,
                      pal_fadeColor(redPalette[i], pal_toFadeRed[i]),
                      greenPalette[i], bluePalette[i], -1, videoMode);

                  if (redPalette[i] != pal_toFadeRed[i])
                        stop = 0;
            }
            return stop;
      } else if (oper == 2) {
            stop = 1;
            for (i = 0; i < 16; i++) {
                  vid_setPalElem(i,
                      redPalette[i],
                      pal_fadeColor(greenPalette[i], pal_toFadeGreen[i]),
                      bluePalette[i], -1, videoMode);

                  if (greenPalette[i] != pal_toFadeGreen[i])
                        stop = 0;
            }
            return stop;
      } else if (oper == 3) {
            stop = 1;
            for (i = 0; i < 16; i++) {
                  vid_setPalElem(i,
                      redPalette[i],
                      greenPalette[i],
                      pal_fadeColor(bluePalette[i], pal_toFadeBlue[i]),
                      -1, videoMode);

                  if (bluePalette[i] != pal_toFadeBlue[i])
                        stop = 0;
            }
            return stop;
      }
      return 1;
}

void pal_fade(PalDesc *palDesc, int16 fade, int16 allColors) {
      char stop;
      int16 i;

      if (fade < 0)
            pal_fadeValue = -fade;
      else
            pal_fadeValue = 2;

      if (colorCount < 256) {
            if (palDesc != 0)
                  vid_setFullPalette(palDesc);
            return;
      }

      if (setAllPalette == 0) {
            if (palDesc == 0) {
                  for (i = 0; i < 16; i++) {
                        pal_toFadeRed[i] = 0;
                        pal_toFadeGreen[i] = 0;
                        pal_toFadeBlue[i] = 0;
                  }
            } else {
                  for (i = 0; i < 16; i++) {
                        pal_toFadeRed[i] = palDesc->vgaPal[i].red;
                        pal_toFadeGreen[i] = palDesc->vgaPal[i].green;
                        pal_toFadeBlue[i] = palDesc->vgaPal[i].blue;
                  }
            }
      } else {
            if (inVM != 0)
                  error("pal_fade: inVM != 0 is not supported");

            if (palDesc == 0) {
                  for (i = 0; i < 256; i++) {
                        pal_toFadeRed[i] = 0;
                        pal_toFadeGreen[i] = 0;
                        pal_toFadeBlue[i] = 0;
                  }
            } else {
                  for (i = 0; i < 256; i++) {
                        pal_toFadeRed[i] = palDesc->vgaPal[i].red;
                        pal_toFadeGreen[i] = palDesc->vgaPal[i].green;
                        pal_toFadeBlue[i] = palDesc->vgaPal[i].blue;
                  }
            }
      }

      if (allColors == 0) {
            do {
                  if (tmpPalBuffer == 0)
                        vid_waitRetrace(videoMode);

                  stop = pal_fadeStep(0);

                  if (fade > 0)
                        util_delay(fade);
            } while (stop == 0);

            if (palDesc != 0)
                  vid_setFullPalette(palDesc);
            else
                  util_clearPalette();
      }

      if (allColors == 1) {
            do {
                  vid_waitRetrace(videoMode);
                  stop = pal_fadeStep(1);
            } while (stop == 0);

            do {
                  vid_waitRetrace(videoMode);
                  stop = pal_fadeStep(2);
            } while (stop == 0);

            do {
                  vid_waitRetrace(videoMode);
                  stop = pal_fadeStep(3);
            } while (stop == 0);

            if (palDesc != 0)
                  vid_setFullPalette(palDesc);
            else
                  util_clearPalette();
      }

      free(tmpPalBuffer);
      tmpPalBuffer = 0;
}

}                       // End of namespace Gob

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