ref: a599e667ad1e92b0f47cc4acec749bb3e35f94c1
dir: /src/doom/f_wipe.c/
//
// Copyright(C) 1993-1996 Id Software, Inc.
// Copyright(C) 2005-2014 Simon Howard
//
// 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.
//
// DESCRIPTION:
// Mission begin melt/wipe screen special effect.
//
#include <string.h>
#include "z_zone.h"
#include "i_video.h"
#include "v_video.h"
#include "m_random.h"
#include "doomtype.h"
#include "f_wipe.h"
//
// SCREEN WIPE PACKAGE
//
// when zero, stop the wipe
static boolean go = 0;
static pixel_t* wipe_scr_start;
static pixel_t* wipe_scr_end;
static pixel_t* wipe_scr;
void
wipe_shittyColMajorXform
( dpixel_t* array,
int width,
int height )
{
int x;
int y;
dpixel_t* dest;
dest = (dpixel_t*) Z_Malloc(width*height*sizeof(*dest), PU_STATIC, 0);
for(y=0;y<height;y++)
for(x=0;x<width;x++)
dest[x*height+y] = array[y*width+x];
memcpy(array, dest, width*height*sizeof(*dest));
Z_Free(dest);
}
int
wipe_initColorXForm
( int width,
int height,
int ticks )
{
memcpy(wipe_scr, wipe_scr_start, width*height*sizeof(*wipe_scr));
return 0;
}
int
wipe_doColorXForm
( int width,
int height,
int ticks )
{
boolean changed;
pixel_t* w;
pixel_t* e;
int newval;
changed = false;
w = wipe_scr;
e = wipe_scr_end;
while (w!=wipe_scr+width*height)
{
if (*w != *e)
{
if (*w > *e)
{
newval = *w - ticks;
if (newval < *e)
*w = *e;
else
*w = newval;
changed = true;
}
else if (*w < *e)
{
newval = *w + ticks;
if (newval > *e)
*w = *e;
else
*w = newval;
changed = true;
}
}
w++;
e++;
}
return !changed;
}
int
wipe_exitColorXForm
( int width,
int height,
int ticks )
{
return 0;
}
static int* y;
int
wipe_initMelt
( int width,
int height,
int ticks )
{
int i, r;
// copy start screen to main screen
memcpy(wipe_scr, wipe_scr_start, width*height*sizeof(*wipe_scr));
// makes this wipe faster (in theory)
// to have stuff in column-major format
wipe_shittyColMajorXform((dpixel_t*)wipe_scr_start, width/2, height);
wipe_shittyColMajorXform((dpixel_t*)wipe_scr_end, width/2, height);
// setup initial column positions
// (y<0 => not ready to scroll yet)
y = (int *) Z_Malloc(width*sizeof(int), PU_STATIC, 0);
y[0] = -(M_Random()%16);
for (i=1;i<width;i++)
{
r = (M_Random()%3) - 1;
y[i] = y[i-1] + r;
if (y[i] > 0) y[i] = 0;
else if (y[i] == -16) y[i] = -15;
}
return 0;
}
int
wipe_doMelt
( int width,
int height,
int ticks )
{
int i;
int j;
int dy;
int idx;
dpixel_t* s;
dpixel_t* d;
boolean done = true;
width/=2;
while (ticks--)
{
for (i=0;i<width;i++)
{
if (y[i]<0)
{
y[i]++; done = false;
}
else if (y[i] < height)
{
dy = (y[i] < 16) ? y[i]+1 : 8;
if (y[i]+dy >= height) dy = height - y[i];
s = &((dpixel_t *)wipe_scr_end)[i*height+y[i]];
d = &((dpixel_t *)wipe_scr)[y[i]*width+i];
idx = 0;
for (j=dy;j;j--)
{
d[idx] = *(s++);
idx += width;
}
y[i] += dy;
s = &((dpixel_t *)wipe_scr_start)[i*height];
d = &((dpixel_t *)wipe_scr)[y[i]*width+i];
idx = 0;
for (j=height-y[i];j;j--)
{
d[idx] = *(s++);
idx += width;
}
done = false;
}
}
}
return done;
}
int
wipe_exitMelt
( int width,
int height,
int ticks )
{
Z_Free(y);
Z_Free(wipe_scr_start);
Z_Free(wipe_scr_end);
return 0;
}
int
wipe_StartScreen
( int x,
int y,
int width,
int height )
{
wipe_scr_start = Z_Malloc(SCREENWIDTH * SCREENHEIGHT * sizeof(*wipe_scr_start), PU_STATIC, NULL);
I_ReadScreen(wipe_scr_start);
return 0;
}
int
wipe_EndScreen
( int x,
int y,
int width,
int height )
{
wipe_scr_end = Z_Malloc(SCREENWIDTH * SCREENHEIGHT * sizeof(*wipe_scr_end), PU_STATIC, NULL);
I_ReadScreen(wipe_scr_end);
V_DrawBlock(x, y, width, height, wipe_scr_start); // restore start scr.
return 0;
}
int
wipe_ScreenWipe
( int wipeno,
int x,
int y,
int width,
int height,
int ticks )
{
int rc;
static int (*wipes[])(int, int, int) =
{
wipe_initColorXForm, wipe_doColorXForm, wipe_exitColorXForm,
wipe_initMelt, wipe_doMelt, wipe_exitMelt
};
// initial stuff
if (!go)
{
go = 1;
// wipe_scr = (pixel_t *) Z_Malloc(width*height, PU_STATIC, 0); // DEBUG
wipe_scr = I_VideoBuffer;
(*wipes[wipeno*3])(width, height, ticks);
}
// do a piece of wipe-in
V_MarkRect(0, 0, width, height);
rc = (*wipes[wipeno*3+1])(width, height, ticks);
// V_DrawBlock(x, y, 0, width, height, wipe_scr); // DEBUG
// final stuff
if (rc)
{
go = 0;
(*wipes[wipeno*3+2])(width, height, ticks);
}
return !go;
}