Yh course, with pleasure.
I have the source attached to this mail.
Thanks in advance.
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#include <stdio.h>
#include <stdlib.h>
#include <string.h>
#include <time.h>
#include “SDL.h”
#define XSIZE 800 //640
#define YSIZE 600 //480
SDL_Surface *thescreen;
unsigned char *vmem1, *vmem2;
int mousex,mousey;
SDL_Color themap[256];
int scrlock()
{
if(SDL_MUSTLOCK(thescreen))
{
if ( SDL_LockSurface(thescreen) < 0 )
{
fprintf(stderr, “Couldn’t lock display surface: %s\n”,
SDL_GetError());
return -1;
}
}
return 0;
}
void scrunlock(void)
{
if(SDL_MUSTLOCK(thescreen))
SDL_UnlockSurface(thescreen);
SDL_UpdateRect(thescreen, 0, 0, 0, 0);
}
#define MOUSEFRAC 2
#define MAXBLOBS 512
#define BLOBFRAC 6
#define BLOBGRAVITY 5
#define THRESHOLD 20
#define SMALLSIZE 3
#define BIGSIZE 6
#define ABS(x) ((x)<0 ? -(x) : (x))
int explodenum;
char sizes[]={2,3,4,5,8,5,4,3};
struct blob {
struct blob *blobnext;
int blobx;
int bloby;
int blobdx;
int blobdy;
int bloblife;
int blobsize;
} *blobs,*freeblobs,*activeblobs;
unsigned char **mul640;
int oldmode;
char sqrttab[]={
0,1,1,1,2,2,2,2,2,3,3,3,3,3,3,3,
4,4,4,4,4,4,4,4,4,5,5,5,5,5,5,5,
5,5,5,5,6,6,6,6,6,6,6,6,6,6,6,6,
6,7,7,7,7,7,7,7,7,7,7,7,7,7,7,7,
8,8,8,8,8,8,8,8,8,8,8,8,8,8,8,8,
8,9,9,9,9,9,9,9,9,9,9,9,9,9,9,9,
9,9,9,9,10,10,10,10,10,10,10,10,10,10,10,10,
10,10,10,10,10,10,10,10,10,11,11,11,11,11,11,11,
11,11,11,11,11,11,11,11,11,11,11,11,11,11,11,11,
12,12,12,12,12,12,12,12,12,12,12,12,12,12,12,12,
12,12,12,12,12,12,12,12,12,13,13,13,13,13,13,13,
13,13,13,13,13,13,13,13,13,13,13,13,13,13,13,13,
13,13,13,13,14,14,14,14,14,14,14,14,14,14,14,14,
14,14,14,14,14,14,14,14,14,14,14,14,14,14,14,14,
14,15,15,15,15,15,15,15,15,15,15,15,15,15,15,15,
15,15,15,15,15,15,15,15,15,15,15,15,15,15,15,15
};
void nomem(void)
{
printf(“Not enough low memory!\n”);
SDL_Quit();
exit(1);
}
void fire(unsigned char *p1,unsigned char *p2,int pitch,char *map)
{
int x,y;
unsigned char *p3, *p4;
for(y=2;y<YSIZE;y++)
{
for(x=0;x<XSIZE;x++)
{
p3 = p1+y*XSIZE+x;
p4 = p2+y*pitch+x;
*p4=map[*p3+p3[-XSIZE]+p3[-XSIZE-1]+p3[-XSIZE+1]+p3[-1]+p3[1]+p3[-XSIZE-XSIZE-1]+p3[-XSIZE-XSIZE]+p3[-XSIZE-XSIZE+1]];
}
}
}
void disk(x,y,rad)
{
unsigned char p;
int i,j,k,aj;
int rad2=radrad;
int w;
for(j=-rad;j<=rad;j++)
{
w=sqrttab[rad2-j*j];
aj=ABS(j)<<2;
if(w)
{
p=mul640[y+j]+x-w;
k=w+w+1;
i=-w;
while(k--) {*p++=255-(ABS(i)<<2)-aj;i++;}
}
}
}
void trydisk(void)
{
if(mousex>10 && mousex<XSIZE-10 && mousey>10 && mousey<YSIZE-10)
disk(mousex,mousey,8);
}
void addblob(void)
{
int dx,dy;
struct blob *ablob;
if(!freeblobs) return;
dx=(rand()&255)-128;
dy=(rand()%200)+340;
ablob=freeblobs;
freeblobs=freeblobs->blobnext;
ablob->bloblife=(rand()&511)+256;
ablob->blobdx=dx;
ablob->blobdy=dy;
ablob->blobx=(256+(rand()&127))<<BLOBFRAC;
ablob->bloby=2<<BLOBFRAC;
ablob->blobnext=activeblobs;
ablob->blobsize=BIGSIZE;
activeblobs=ablob;
}
void moveblobs(void)
{
struct blob **lastblob,*ablob;
int x,y;
lastblob=&activeblobs;
while(ablob=*lastblob)
{
x=ablob->blobx>>BLOBFRAC;
y=ablob->bloby>>BLOBFRAC;
if(!--ablob->bloblife || y<0 || x<10 || x>XSIZE-10)
{
*lastblob=ablob->blobnext;
ablob->blobnext=freeblobs;
freeblobs=ablob;
continue;
}
ablob->blobx+=ablob->blobdx;
ablob->bloby+=ablob->blobdy;
ablob->blobdy-=BLOBGRAVITY;
lastblob=&ablob->blobnext;
}
}
void putblobs(void)
{
struct blob *ablob,*ablob2,*temp;
int x,y,dy;
int i,size;
long x2,y2,vel;
ablob=activeblobs;
activeblobs=0;
while(ablob)
{
dy=ablob->blobdy;
if(ablob->blobsize!=SMALLSIZE && (dy>-THRESHOLD && dy<THRESHOLD && !(rand()&7) || (rand()&127)==63))
{
i=explodenum;
while(i-- && freeblobs)
{
ablob2=freeblobs;
freeblobs=freeblobs->blobnext;
ablob2->blobx=ablob->blobx;
ablob2->bloby=ablob->bloby;
for(;;)
{
x2=(rand()&511)-256;
y2=(rand()&511)-256;
vel=x2*x2+y2*y2;
if(vel>0x3000 && vel<0x10000L) break;
}
ablob2->blobdx=ablob->blobdx+x2;
ablob2->blobdy=ablob->blobdy+y2;
ablob2->bloblife=16+(rand()&31);
ablob2->blobsize=SMALLSIZE;
ablob2->blobnext=activeblobs;
activeblobs=ablob2;
ablob->bloblife=1;
}
}
x=ablob->blobx>>BLOBFRAC;
y=ablob->bloby>>BLOBFRAC;
size=ablob->blobsize;
if(size==BIGSIZE && ablob->blobdy>0 && ablob->blobdy<200)
size=sizes[ablob->bloblife&7];
if(x>10 && x<XSIZE-10 && y>10 && y<YSIZE-10)
disk(x,YSIZE-1-y,size);
temp=ablob;
ablob=ablob->blobnext;
temp->blobnext=activeblobs;
activeblobs=temp;
}
}
#define RATE 1
void normal(char *map)
{
int i,j;
for(i=0;i<8192;i++)
{
j=i/9;
map[i]=j<256 ? (j>=RATE ? j-RATE : 0) : 255;
}
}
void bright(char *map)
{
int i;
for(i=0;i<8192;i++) map[i]=i>>3<255 ? (i>>3) : 255;
}
void updatemap(void)
{
SDL_SetColors(thescreen, themap, 0, 256);
}
void loadcolor(int n,int r,int g,int b)
{
themap[n].r=r<<2;
themap[n].g=g<<2;
themap[n].b=b<<2;
}
void loadcolors(unsigned int which)
{
int i,j;
int r,g,b;
which%=11;
for(i=0;i<256;i++)
{
switch(which)
{
case 0:
if(i<64) loadcolor(i,0,0,0);
else if(i<128) loadcolor(i,i-64,0,0);
else if(i<192) loadcolor(i,63,i-128,0);
else loadcolor(i,63,63,i-192);
break;
case 1:
if(i<64) loadcolor(i,0,0,0);
else if(i<128) loadcolor(i,0,0,i-64);
else loadcolor(i,(i-128)>>1,(i-128)>>1,63);
break;
case 2:
loadcolor(i,i>>2,i>>2,i>>2);
break;
case 3:
r=rand()&0x3f;
g=rand()&0x3f;
b=rand()&0x3f;
loadcolor(i,r*i>>8,g*i>>8,b*i>>8);
break;
case 4:
loadcolor(i,i>>2,0,0);
break;
case 5:
loadcolor(i,0,i>>2,0);
break;
case 6:
loadcolor(i,0,0,i>>2);
break;
case 7:
j=i&15;
if(i&16) j=15-j;
j=(i>>2)*j/16;
loadcolor(i,j,j,j);
break;
case 8:
j=0;
if(i>8 && i<128) j=63;
loadcolor(i,j,j,j);
break;
case 9:
j=31-(i&31)<<1;
r=i&32 ? j : 0;
g=i&64 ? j : 0;
b=i&128 ? j : 0;
loadcolor(i,r,g,b);
break;
case 10:
j=(i&15)<<2;
if(i&16) j=63-j;
r=i&32 ? j : 0;
g=i&64 ? j : 0;
b=i&128 ? j : 0;
loadcolor(i,r,g,b);
break;
}
}
updatemap();
}
main(int argc, char *argv[])
{
int i,k;
char *remap,*remap2;
unsigned char *p1, *p2;
long frames;
int flash;
int whichmap;
int key;
int ispaused;
unsigned long videoflags;
int done;
int now;
SDL_Event event;
long starttime;
int buttonstate;
srand(time(NULL));
if ( SDL_Init(SDL_INIT_VIDEO) < 0 )
{
fprintf(stderr, "Couldn't initialize SDL: %s\n",SDL_GetError());
exit(1);
}
videoflags = SDL_SWSURFACE|SDL_FULLSCREEN|SDL_HWPALETTE;
thescreen = SDL_SetVideoMode(XSIZE, YSIZE, 8, videoflags);
if ( thescreen == NULL )
{
fprintf(stderr, "Couldn't set display mode: %s\n",
SDL_GetError());
SDL_Quit();
exit(5);
}
vmem1=NULL;
vmem2=malloc(XSIZE*YSIZE);
if(!vmem2) nomem();
mul640=malloc(YSIZE*sizeof(char *));
if(!mul640) nomem();
remap=malloc(16384);
if(!remap) nomem();
remap2=malloc(16384);
if(!remap2) nomem();
blobs=malloc(MAXBLOBS*sizeof(struct blob));
if(!blobs) nomem();
puts("1 = Change color map");
puts("2 = Randomly change color map");
puts("p = Pause");
puts("spc = Fire");
puts("esc = Exit");
puts("Left mouse button = paint");
puts("Right mouse button, CR = ignite atmosphere");
freeblobs=activeblobs=0;
for(i=0;i<MAXBLOBS;i++)
{
blobs[i].blobnext=freeblobs;
freeblobs=blobs+i;
}
normal(remap);
bright(remap2);
flash=0;
whichmap=0;
loadcolors(whichmap);
frames=0;
ispaused=0;
addblob();
done = 0;
now=0;
starttime=SDL_GetTicks();
buttonstate=0;
mousex=mousey=0;
while(!done)
{
if ( scrlock() < 0 ) continue;
frames++;
if ( vmem1 != (unsigned char *)thescreen->pixels )
{
p1=vmem1=thescreen->pixels;
for (i=0;i<YSIZE;i++)
{
mul640[i]=i*thescreen->pitch+vmem1;
memset(p1,0,XSIZE);
p1+=thescreen->pitch;
}
}
if(!ispaused)
{
now++;
if(!flash)
{
if(explodenum>96 && explodenum<160 && !(rand()&511) || (buttonstate&8))
flash=60;
} else --flash;
explodenum=(now>>4)+1;if(explodenum==320) now=0;
if(explodenum>256) explodenum=256;
if(!(rand()&31))
addblob();
moveblobs();
putblobs();
if(buttonstate&2) trydisk();
p1=vmem1;
p2=vmem2;
k=thescreen->pitch;
for(i=0;i<YSIZE;i++)
{
memcpy(p2,p1,XSIZE);
p2+=XSIZE;
p1+=k;
}
fire(vmem2,vmem1,k,flash ? remap2 :remap);
}
scrunlock();
while(SDL_PollEvent(&event))
{
switch (event.type)
{
/*case SDL_MOUSEBUTTONDOWN:
case SDL_MOUSEBUTTONUP:
if ( event.button.state == SDL_PRESSED )
buttonstate|=1<<event.button.button;
else
buttonstate&=~(1<<event.button.button);
mousex=event.button.x;
mousey=event.button.y;
if(!ispaused && buttonstate&2) trydisk();
break;
case SDL_MOUSEMOTION:
mousex=event.motion.x;
mousey=event.motion.y;
if(!ispaused && buttonstate&2) trydisk();
break;*/
case SDL_KEYDOWN:
key=event.key.keysym.sym;
if(key==SDLK_RETURN) {flash=60;break;}
if(key==SDLK_1 || key==SDLK_2)
{
if(key==SDLK_1)
++whichmap;
else
whichmap=rand();
loadcolors(whichmap);
break;
}
if(key==SDLK_ESCAPE) {done=1;break;}
if(key==SDLK_SPACE && !ispaused) {addblob();break;}
if(key==SDLK_p) {ispaused=!ispaused;break;}
break;
case SDL_QUIT:
done = 1;
break;
default:
break;
}
}
}
starttime=SDL_GetTicks()-starttime;
if(!starttime) starttime=1;
SDL_Quit();
printf("fps = %d\n",1000*frames/starttime);
exit(0);
}