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114 lines
2.9 KiB
C++
114 lines
2.9 KiB
C++
//-----------------------------------------------------------------------------
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//
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// Copyright 1993-1996 id Software
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// Copyright 1999-2016 Randy Heit
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//
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// This program is free software: you can redistribute it and/or modify
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// it under the terms of the GNU General Public License as published by
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// the Free Software Foundation, either version 3 of the License, or
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// (at your option) any later version.
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//
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// This program 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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// MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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// GNU General Public License for more details.
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//
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// You should have received a copy of the GNU General Public License
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// along with this program. If not, see http://www.gnu.org/licenses/
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//
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//-----------------------------------------------------------------------------
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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 "v_video.h"
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#include "m_random.h"
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#include "f_wipe.h"
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#include "templates.h"
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int wipe_CalcBurn (uint8_t *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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uint8_t *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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uint8_t *pixel = from;
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// special case: first pixel on line
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uint8_t *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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