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https://github.com/id-Software/DOOM.git
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The DOOM sources as originally released on December 23, 1997
This commit is contained in:
Travis Bradshaw
302
linuxdoom-1.10/f_wipe.c
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302
linuxdoom-1.10/f_wipe.c
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// Emacs style mode select -*- C++ -*-
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//-----------------------------------------------------------------------------
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//
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// $Id:$
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//
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// Copyright (C) 1993-1996 by id Software, Inc.
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//
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// This source is available for distribution and/or modification
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// only under the terms of the DOOM Source Code License as
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// published by id Software. All rights reserved.
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//
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// The source is distributed in the hope that it will be useful,
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// but WITHOUT ANY WARRANTY; without even the implied warranty of
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// FITNESS FOR A PARTICULAR PURPOSE. See the DOOM Source Code License
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// for more details.
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//
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// $Log:$
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//
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// DESCRIPTION:
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// Mission begin melt/wipe screen special effect.
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//
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//-----------------------------------------------------------------------------
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static const char rcsid[] = "$Id: f_wipe.c,v 1.2 1997/02/03 22:45:09 b1 Exp $";
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#include "z_zone.h"
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#include "i_video.h"
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#include "v_video.h"
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#include "m_random.h"
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#include "doomdef.h"
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#include "f_wipe.h"
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//
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// SCREEN WIPE PACKAGE
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//
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// when zero, stop the wipe
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static boolean go = 0;
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static byte* wipe_scr_start;
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static byte* wipe_scr_end;
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static byte* wipe_scr;
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void
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wipe_shittyColMajorXform
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( short* array,
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int width,
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int height )
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{
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int x;
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int y;
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short* dest;
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dest = (short*) Z_Malloc(width*height*2, PU_STATIC, 0);
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for(y=0;y<height;y++)
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for(x=0;x<width;x++)
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dest[x*height+y] = array[y*width+x];
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memcpy(array, dest, width*height*2);
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Z_Free(dest);
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}
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int
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wipe_initColorXForm
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( int width,
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int height,
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int ticks )
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{
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memcpy(wipe_scr, wipe_scr_start, width*height);
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return 0;
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}
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int
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wipe_doColorXForm
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( int width,
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int height,
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int ticks )
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{
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boolean changed;
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byte* w;
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byte* e;
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int newval;
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changed = false;
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w = wipe_scr;
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e = wipe_scr_end;
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while (w!=wipe_scr+width*height)
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{
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if (*w != *e)
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{
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if (*w > *e)
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{
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newval = *w - ticks;
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if (newval < *e)
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*w = *e;
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else
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*w = newval;
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changed = true;
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}
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else if (*w < *e)
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{
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newval = *w + ticks;
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if (newval > *e)
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*w = *e;
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else
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*w = newval;
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changed = true;
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}
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}
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w++;
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e++;
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}
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return !changed;
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}
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int
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wipe_exitColorXForm
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( int width,
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int height,
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int ticks )
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{
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return 0;
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}
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static int* y;
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int
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wipe_initMelt
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( int width,
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int height,
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int ticks )
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{
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int i, r;
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// copy start screen to main screen
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memcpy(wipe_scr, wipe_scr_start, width*height);
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// makes this wipe faster (in theory)
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// to have stuff in column-major format
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wipe_shittyColMajorXform((short*)wipe_scr_start, width/2, height);
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wipe_shittyColMajorXform((short*)wipe_scr_end, width/2, height);
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// setup initial column positions
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// (y<0 => not ready to scroll yet)
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y = (int *) Z_Malloc(width*sizeof(int), PU_STATIC, 0);
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y[0] = -(M_Random()%16);
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for (i=1;i<width;i++)
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{
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r = (M_Random()%3) - 1;
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y[i] = y[i-1] + r;
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if (y[i] > 0) y[i] = 0;
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else if (y[i] == -16) y[i] = -15;
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}
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return 0;
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}
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int
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wipe_doMelt
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( int width,
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int height,
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int ticks )
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{
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int i;
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int j;
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int dy;
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int idx;
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short* s;
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short* d;
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boolean done = true;
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width/=2;
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while (ticks--)
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{
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for (i=0;i<width;i++)
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{
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if (y[i]<0)
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{
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y[i]++; done = false;
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}
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else if (y[i] < height)
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{
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dy = (y[i] < 16) ? y[i]+1 : 8;
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if (y[i]+dy >= height) dy = height - y[i];
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s = &((short *)wipe_scr_end)[i*height+y[i]];
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d = &((short *)wipe_scr)[y[i]*width+i];
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idx = 0;
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for (j=dy;j;j--)
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{
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d[idx] = *(s++);
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idx += width;
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}
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y[i] += dy;
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s = &((short *)wipe_scr_start)[i*height];
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d = &((short *)wipe_scr)[y[i]*width+i];
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idx = 0;
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for (j=height-y[i];j;j--)
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{
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d[idx] = *(s++);
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idx += width;
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}
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done = false;
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}
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}
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}
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return done;
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}
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int
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wipe_exitMelt
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( int width,
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int height,
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int ticks )
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{
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Z_Free(y);
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return 0;
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}
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int
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wipe_StartScreen
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( int x,
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int y,
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int width,
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int height )
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{
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wipe_scr_start = screens[2];
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I_ReadScreen(wipe_scr_start);
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return 0;
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}
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int
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wipe_EndScreen
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( int x,
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int y,
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int width,
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int height )
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{
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wipe_scr_end = screens[3];
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I_ReadScreen(wipe_scr_end);
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V_DrawBlock(x, y, 0, width, height, wipe_scr_start); // restore start scr.
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return 0;
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}
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int
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wipe_ScreenWipe
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( int wipeno,
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int x,
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int y,
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int width,
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int height,
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int ticks )
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{
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int rc;
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static int (*wipes[])(int, int, int) =
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{
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wipe_initColorXForm, wipe_doColorXForm, wipe_exitColorXForm,
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wipe_initMelt, wipe_doMelt, wipe_exitMelt
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};
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void V_MarkRect(int, int, int, int);
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// initial stuff
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if (!go)
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{
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go = 1;
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// wipe_scr = (byte *) Z_Malloc(width*height, PU_STATIC, 0); // DEBUG
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wipe_scr = screens[0];
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(*wipes[wipeno*3])(width, height, ticks);
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}
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// do a piece of wipe-in
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V_MarkRect(0, 0, width, height);
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rc = (*wipes[wipeno*3+1])(width, height, ticks);
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// V_DrawBlock(x, y, 0, width, height, wipe_scr); // DEBUG
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// final stuff
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if (rc)
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{
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go = 0;
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(*wipes[wipeno*3+2])(width, height, ticks);
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}
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return !go;
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}
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