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https://github.com/ZDoom/qzdoom-gpl.git
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439 lines
9.4 KiB
C++
439 lines
9.4 KiB
C++
// 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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#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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#include "c_cvars.h"
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#include "templates.h"
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//
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// SCREEN WIPE PACKAGE
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//
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static int CurrentWipeType;
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static short *wipe_scr_start;
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static short *wipe_scr_end;
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static int *y;
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// [RH] Fire Wipe
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#define FIREWIDTH 64
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#define FIREHEIGHT 64
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static BYTE *burnarray;
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static int density;
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static int burntime;
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// [RH] Crossfade
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static int fade;
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// Melt -------------------------------------------------------------
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// Match the strip sizes that oldschool Doom used on a 320x200 screen.
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#define MELT_WIDTH 160
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#define MELT_HEIGHT 200
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void wipe_shittyColMajorXform (short *array)
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{
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int x, y;
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short *dest;
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int width = SCREENWIDTH / 2;
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dest = new short[width*SCREENHEIGHT*2];
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for(y = 0; y < SCREENHEIGHT; y++)
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for(x = 0; x < width; x++)
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dest[x*SCREENHEIGHT+y] = array[y*width+x];
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memcpy(array, dest, SCREENWIDTH*SCREENHEIGHT);
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delete[] dest;
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}
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bool wipe_initMelt (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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screen->DrawBlock (0, 0, SCREENWIDTH, SCREENHEIGHT, (BYTE *)wipe_scr_start);
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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 (wipe_scr_start);
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wipe_shittyColMajorXform (wipe_scr_end);
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// setup initial column positions
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// (y<0 => not ready to scroll yet)
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y = new int[MELT_WIDTH];
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y[0] = -(M_Random() & 15);
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for (i = 1; i < MELT_WIDTH; i++)
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{
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r = (M_Random()%3) - 1;
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y[i] = clamp(y[i-1] + r, -15, 0);
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}
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return 0;
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}
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bool wipe_doMelt (int ticks)
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{
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int i, j, dy, x;
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const short *s;
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short *d;
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bool done = true;
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while (ticks--)
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{
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done = true;
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for (i = 0; i < MELT_WIDTH; i++)
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{
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if (y[i] < 0)
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{
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y[i]++;
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done = false;
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}
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else if (y[i] < MELT_HEIGHT)
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{
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dy = (y[i] < 16) ? y[i]+1 : 8;
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y[i] = MIN(y[i] + dy, MELT_HEIGHT);
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done = false;
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}
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if (ticks == 0 && y[i] >= 0)
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{ // Only draw for the final tick.
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const int pitch = screen->GetPitch() / 2;
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int sy = y[i] * SCREENHEIGHT / MELT_HEIGHT;
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for (x = i * (SCREENWIDTH/2) / MELT_WIDTH; x < (i + 1) * (SCREENWIDTH/2) / MELT_WIDTH; ++x)
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{
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s = &wipe_scr_end[x*SCREENHEIGHT];
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d = &((short *)screen->GetBuffer())[x];
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for (j = sy; j != 0; --j)
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{
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*d = *(s++);
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d += pitch;
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}
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s = &wipe_scr_start[x*SCREENHEIGHT];
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for (j = SCREENHEIGHT - sy; j != 0; --j)
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{
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*d = *(s++);
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d += pitch;
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}
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}
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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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bool wipe_exitMelt (int ticks)
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{
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delete[] y;
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return 0;
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}
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// Burn -------------------------------------------------------------
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bool wipe_initBurn (int ticks)
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{
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burnarray = new BYTE[FIREWIDTH * (FIREHEIGHT+5)];
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memset (burnarray, 0, FIREWIDTH * (FIREHEIGHT+5));
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density = 4;
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burntime = 0;
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return 0;
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}
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int wipe_CalcBurn (BYTE *burnarray, int width, int height, int density)
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{
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// This is a modified version of the fire that was once used
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// on the player setup menu.
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static int voop;
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int a, b;
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BYTE *from;
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// generator
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from = &burnarray[width * height];
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b = voop;
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voop += density / 3;
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for (a = 0; a < density/8; a++)
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{
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unsigned int offs = (a+b) & (width - 1);
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unsigned int v = M_Random();
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v = MIN(from[offs] + 4 + (v & 15) + (v >> 3) + (M_Random() & 31), 255u);
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from[offs] = from[width*2 + ((offs + width*3/2) & (width - 1))] = v;
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}
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density = MIN(density + 10, width * 7);
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from = burnarray;
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for (b = 0; b <= height; b += 2)
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{
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BYTE *pixel = from;
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// special case: first pixel on line
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BYTE *p = pixel + (width << 1);
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unsigned int top = *p + *(p + width - 1) + *(p + 1);
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unsigned int bottom = *(pixel + (width << 2));
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unsigned int c1 = (top + bottom) >> 2;
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if (c1 > 1) c1--;
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*pixel = c1;
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*(pixel + width) = (c1 + bottom) >> 1;
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pixel++;
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// main line loop
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for (a = 1; a < width-1; a++)
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{
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// sum top pixels
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p = pixel + (width << 1);
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top = *p + *(p - 1) + *(p + 1);
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// bottom pixel
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bottom = *(pixel + (width << 2));
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// combine pixels
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c1 = (top + bottom) >> 2;
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if (c1 > 1) c1--;
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// store pixels
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*pixel = c1;
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*(pixel + width) = (c1 + bottom) >> 1; // interpolate
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// next pixel
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pixel++;
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}
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// special case: last pixel on line
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p = pixel + (width << 1);
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top = *p + *(p - 1) + *(p - width + 1);
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bottom = *(pixel + (width << 2));
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c1 = (top + bottom) >> 2;
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if (c1 > 1) c1--;
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*pixel = c1;
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*(pixel + width) = (c1 + bottom) >> 1;
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// next line
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from += width << 1;
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}
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// Check for done-ness. (Every pixel with level 126 or higher counts as done.)
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for (a = width * height, from = burnarray; a != 0; --a, ++from)
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{
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if (*from < 126)
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{
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return density;
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}
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}
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return -1;
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}
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bool wipe_doBurn (int ticks)
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{
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bool done;
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burntime += ticks;
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ticks *= 2;
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// Make the fire burn
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done = false;
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while (!done && ticks--)
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{
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density = wipe_CalcBurn(burnarray, FIREWIDTH, FIREHEIGHT, density);
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done = (density < 0);
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}
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// Draw the screen
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fixed_t xstep, ystep, firex, firey;
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int x, y;
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BYTE *to, *fromold, *fromnew;
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xstep = (FIREWIDTH * FRACUNIT) / SCREENWIDTH;
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ystep = (FIREHEIGHT * FRACUNIT) / SCREENHEIGHT;
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to = screen->GetBuffer();
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fromold = (BYTE *)wipe_scr_start;
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fromnew = (BYTE *)wipe_scr_end;
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for (y = 0, firey = 0; y < SCREENHEIGHT; y++, firey += ystep)
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{
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for (x = 0, firex = 0; x < SCREENWIDTH; x++, firex += xstep)
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{
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int fglevel;
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fglevel = burnarray[(firex>>FRACBITS)+(firey>>FRACBITS)*FIREWIDTH] / 2;
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if (fglevel >= 63)
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{
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to[x] = fromnew[x];
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}
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else if (fglevel == 0)
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{
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to[x] = fromold[x];
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done = false;
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}
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else
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{
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int bglevel = 64-fglevel;
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DWORD *fg2rgb = Col2RGB8[fglevel];
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DWORD *bg2rgb = Col2RGB8[bglevel];
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DWORD fg = fg2rgb[fromnew[x]];
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DWORD bg = bg2rgb[fromold[x]];
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fg = (fg+bg) | 0x1f07c1f;
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to[x] = RGB32k[0][0][fg & (fg>>15)];
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done = false;
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}
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}
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fromold += SCREENWIDTH;
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fromnew += SCREENWIDTH;
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to += SCREENPITCH;
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}
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return done || (burntime > 40);
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}
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bool wipe_exitBurn (int ticks)
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{
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delete[] burnarray;
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return 0;
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}
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// Crossfade --------------------------------------------------------
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bool wipe_initFade (int ticks)
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{
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fade = 0;
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return 0;
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}
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bool wipe_doFade (int ticks)
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{
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fade += ticks * 2;
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if (fade > 64)
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{
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screen->DrawBlock (0, 0, SCREENWIDTH, SCREENHEIGHT, (BYTE *)wipe_scr_end);
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return true;
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}
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else
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{
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int x, y;
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fixed_t bglevel = 64 - fade;
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DWORD *fg2rgb = Col2RGB8[fade];
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DWORD *bg2rgb = Col2RGB8[bglevel];
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BYTE *fromnew = (BYTE *)wipe_scr_end;
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BYTE *fromold = (BYTE *)wipe_scr_start;
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BYTE *to = screen->GetBuffer();
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for (y = 0; y < SCREENHEIGHT; y++)
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{
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for (x = 0; x < SCREENWIDTH; x++)
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{
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DWORD fg = fg2rgb[fromnew[x]];
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DWORD bg = bg2rgb[fromold[x]];
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fg = (fg+bg) | 0x1f07c1f;
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to[x] = RGB32k[0][0][fg & (fg>>15)];
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}
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fromnew += SCREENWIDTH;
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fromold += SCREENWIDTH;
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to += SCREENPITCH;
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}
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}
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return false;
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}
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bool wipe_exitFade (int ticks)
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{
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return 0;
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}
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// General Wipe Functions -------------------------------------------
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static bool (*wipes[])(int) =
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{
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wipe_initMelt, wipe_doMelt, wipe_exitMelt,
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wipe_initBurn, wipe_doBurn, wipe_exitBurn,
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wipe_initFade, wipe_doFade, wipe_exitFade
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};
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// Returns true if the wipe should be performed.
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bool wipe_StartScreen (int type)
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{
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CurrentWipeType = clamp(type, 0, wipe_NUMWIPES - 1);
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if (CurrentWipeType)
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{
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wipe_scr_start = new short[SCREENWIDTH * SCREENHEIGHT / 2];
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screen->GetBlock (0, 0, SCREENWIDTH, SCREENHEIGHT, (BYTE *)wipe_scr_start);
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return true;
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}
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return false;
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}
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void wipe_EndScreen (void)
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{
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if (CurrentWipeType)
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{
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wipe_scr_end = new short[SCREENWIDTH * SCREENHEIGHT / 2];
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screen->GetBlock (0, 0, SCREENWIDTH, SCREENHEIGHT, (BYTE *)wipe_scr_end);
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screen->DrawBlock (0, 0, SCREENWIDTH, SCREENHEIGHT, (BYTE *)wipe_scr_start); // restore start scr.
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// Initialize the wipe
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(*wipes[(CurrentWipeType-1)*3])(0);
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}
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}
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// Returns true if the wipe is done.
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bool wipe_ScreenWipe (int ticks)
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{
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bool rc;
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if (CurrentWipeType == wipe_None)
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return true;
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// do a piece of wipe-in
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V_MarkRect(0, 0, SCREENWIDTH, SCREENHEIGHT);
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rc = (*wipes[(CurrentWipeType-1)*3+1])(ticks);
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return rc;
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}
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// Final things for the wipe
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void wipe_Cleanup()
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{
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if (wipe_scr_start != NULL)
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{
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delete[] wipe_scr_start;
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wipe_scr_start = NULL;
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}
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if (wipe_scr_end != NULL)
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{
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delete[] wipe_scr_end;
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wipe_scr_end = NULL;
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}
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if (CurrentWipeType > 0)
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{
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(*wipes[(CurrentWipeType-1)*3+2])(0);
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}
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}
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