First release of ZSNES sources
This commit is contained in:
teuf
338
zsnes/src/water.c
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338
zsnes/src/water.c
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//Copyright (C) 1997-2001 ZSNES Team ( zsknight@zsnes.com / _demo_@zsnes.com )
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//
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//This program is free software; you can redistribute it and/or
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//modify it under the terms of the GNU General Public License
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//as published by the Free Software Foundation; either
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//version 2 of the License, or (at your option) any later
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//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, write to the Free Software
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//Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA.
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#include <stdio.h>
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#include <ctype.h>
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#include <math.h>
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#include "fixsin.h"
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extern char *vidbuffer;
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#define SCRW 288
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#define SCRH 224
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static unsigned char vscr[SCRW*SCRH];
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static int Height[2][SCRW*SCRH];
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static void DrawWaterNoLight(int *ptr);
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void DrawWaterWithLight(int *ptr,int light);
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static void SineBlob(int x, int y, int radius, int height, int page);
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static void CalcWater(int *nptr,int *optr,int density);
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static int x,y;
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static int ox=80,oy=60;
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static int xang,yang;
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static int density=4;
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static int Hpage=0;
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static int mode=0x0001;
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static int offset;
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static int pheight=400;
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static int radius=30;
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void DrawWater(void)
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{
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// tslast=tscurrent;
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// tscurrent=time(NULL);
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DrawWaterNoLight(Height[Hpage]);
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// DrawWaterWithLight(Height[Hpage],1);
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if(mode&2) // && (tscurrent-tslast))
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{
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int x,y;
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x=rand()%(SCRW-2)+1;
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y=rand()%(SCRH-2)+1;
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Height[Hpage][y*SCRW+x]=rand()%(pheight<<2);
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}
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/* the surfer */
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if(mode&1)
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{
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int x,y;
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x = (SCRW/2)
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+ ((((FSin( (xang* 65) >>8) >>8)
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* (FSin( (xang*349) >>8) >>8))
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* ((SCRW-8)/2)) >> 16);
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y = (SCRH/2)
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+ ((((FSin( (yang*377) >>8) >>8)
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*(FSin( (yang* 84) >>8) >>8))
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* ((SCRH-8)/2)) >> 16);
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xang += 13;
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yang += 12;
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if(mode & 0x4000)
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{
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offset = (oy+y)/2*SCRW + (ox+x)/2;
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Height[Hpage][offset] = pheight;
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Height[Hpage][offset + 1] =
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Height[Hpage][offset - 1] =
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Height[Hpage][offset + SCRW] =
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Height[Hpage][offset - SCRW] = pheight >> 1;
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offset = y*SCRW + x;
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Height[Hpage][offset] = pheight<<1;
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Height[Hpage][offset + 1] =
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Height[Hpage][offset - 1] =
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Height[Hpage][offset + SCRW] =
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Height[Hpage][offset - SCRW] = pheight;
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}
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else
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{
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SineBlob((ox+x)/2, (oy+y)/2, 3, -1200, Hpage);
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SineBlob(x, y, 4, -2000, Hpage);
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}
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ox = x;
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oy = y;
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}
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if(mode&4)
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{
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if(rand()%20 == 0)
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{
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/*
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if(mode & 0x4000)
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// HeightBlob(-1, -1, radius/2, pheight, Hpage);
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else
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*/
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SineBlob(-1, -1, radius, -pheight*6, Hpage);
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}
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}
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CalcWater(Height[Hpage^1], Height[Hpage], density);
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Hpage ^= 1; /* flip flop */
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}
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void DrawWaterNoLight(int *ptr)
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{
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int dx,dy;
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int x,y;
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int c;
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int p;
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int offset = SCRW+1;
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if(ptr == NULL)
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{
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return;
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}
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for(y=((SCRH-1)*SCRW); offset < y; offset+=2)
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{
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for(x = offset+SCRW-2;offset<x;offset++)
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{
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dx=ptr[offset]-ptr[offset+1];
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dy=ptr[offset]-ptr[offset+SCRW];
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p=offset+SCRW*(dy>>3)+(dx>>3);
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/* if(p>(SCRH*SCRW))
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{
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for(;p<(SCRH*SCRW);p-=SCRW);
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}
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if(p<0)
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{
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for(;p>0;p+=SCRW);
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}
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*/
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if(p >= (SCRW*SCRH) )
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{
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p=(SCRW*SCRH)-1;
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}
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else
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{
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if(p < 0)
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{
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p=0;
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}
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}
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c=vidbuffer[p];
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(c<1) ? c=1 : (c > 31) ? c=31 : 0;
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vscr[offset]=c;
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offset++;
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dx=ptr[offset]-ptr[offset+1];
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dy=ptr[offset]-ptr[offset+SCRW];
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p=offset+SCRW*(dy>>3)+(dx>>3);
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/*
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if(p>(SCRH*SCRW))
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{
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for(;p<(SCRH*SCRW);p-=SCRW);
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}
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if(p<0)
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{
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for(;p>=0;p+=SCRW);
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}
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*/
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if(p >= (SCRW*SCRH) )
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{
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p=(SCRW*SCRH)-1;
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}
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else
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{
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if(p < 0)
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{
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p=0;
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}
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}
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c=vidbuffer[p];
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(c<1) ? c=1 : (c > 31) ? c=31 : 0;
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vscr[offset]=c;
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}
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}
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memcpy( vidbuffer,vscr,SCRW*SCRH);
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// frames++;
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}
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void DrawWaterWithLight(int *ptr,int light)
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{
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int dx,dy;
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int x,y;
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int c;
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int p;
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int offset = SCRW+1;
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if(ptr == NULL)
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{
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return;
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}
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for(y=((SCRH-1)*SCRW); offset < y; offset+=2)
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{
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for(x = offset+SCRW-2;offset<x;offset++)
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{
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dx=ptr[offset]-ptr[offset+1];
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dy=ptr[offset]-ptr[offset+SCRW];
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p=offset+SCRW*(dy>>3)+(dx>>3);
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if(p>(SCRH*SCRW))
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{
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for(;p<(SCRH*SCRW);p-=SCRW);
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}
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if(p<0)
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{
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for(;p>=0;p+=SCRW);
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}
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c=vidbuffer[p];
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c-=(dx>>light);
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(c<0) ? c=0 : (c > 255) ? c=255 : 0;
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vscr[offset]=c;
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offset++;
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dx=ptr[offset]-ptr[offset+1];
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dy=ptr[offset]-ptr[offset+SCRW];
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p=offset+SCRW*(dy>>3)+(dx>>3);
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if(p>(SCRH*SCRW))
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{
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for(;p<(SCRH*SCRW);p-=SCRW);
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}
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if(p<0)
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{
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for(;p>=0;p+=SCRW);
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}
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c=vidbuffer[p];
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c-=(dx>>light);
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(c<0) ? c=0 : (c > 255) ? c=255 : 0;
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vscr[offset]=c;
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}
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}
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memcpy( vidbuffer,vscr,SCRW*SCRH);
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// memcpy( VGLDisplay->Bitmap,vscr,SCRW*SCRH);
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// frames++;
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}
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void CalcWater(int *nptr,int *optr,int density)
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{
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int newh;
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int count = SCRW+1;
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int x,y;
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for(y = (SCRH-1) * SCRW;count<y;count+=2)
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{
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for(x = count+SCRW-2;count<x;count++)
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{
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newh = ((optr[count+SCRW]
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+optr[count-SCRW]
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+optr[count+1]
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+optr[count-1]
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+optr[count-SCRW-1]
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+optr[count-SCRW+1]
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+optr[count+SCRW-1]
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+optr[count+SCRW+1]
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) >> 2)
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- nptr[count];
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nptr[count] = newh - (newh >> density);
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}
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}
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}
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void SineBlob(int x, int y, int radius, int height, int page)
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{
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int cx, cy;
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int left,top,right,bottom;
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int square, dist;
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int radsquare = radius * radius;
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float length = (1024.0/(float)radius)*(1024.0/(float)radius);
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if(x<0) x = 1+radius+ rand()%(SCRW-2*radius-1);
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if(y<0) y = 1+radius+ rand()%(SCRH-2*radius-1);
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// radsquare = (radius*radius) << 8;
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radsquare = (radius*radius);
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// height /= 8;
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left=-radius; right = radius;
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top=-radius; bottom = radius;
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// Perform edge clipping...
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if(x - radius < 1) left -= (x-radius-1);
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if(y - radius < 1) top -= (y-radius-1);
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if(x + radius > SCRW-1) right -= (x+radius-SCRW+1);
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if(y + radius > SCRH-1) bottom-= (y+radius-SCRH+1);
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for(cy = top; cy < bottom; cy++)
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{
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for(cx = left; cx < right; cx++)
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{
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square = cy*cy + cx*cx;
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if(square < radsquare)
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{
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dist = sqrt(square*length);
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Height[page][SCRW*(cy+y) + cx+x]
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+= (int)((FCos(dist)+0xffff)*(height)) >> 19;
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}
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}
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}
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}
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