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#include "bg.h"
extern double fps_factor;
extern SDL_Surface *screen;
int akt_bgtype;
double bg_alpha;
/* clouds */
SPRITE *w1[5];
SPRITE *w2[10];
SPRITE *w3[20];
/* tile */
SDL_Surface *btile=NULL;
double btile_y;
void bg_init(int bg_type)
{
if((bg_type>=BG_LAST)||(bg_type<BG_BLACK))
error(ERR_FATAL,"unknown BG_TYPE: %d",bg_type);
akt_bgtype=bg_type;
bg_alpha=0;
switch(bg_type) {
case BG_BLACK:
break;
case BG_CLOUDS:
clouds_init();
break;
case BG_STARS:
// stars_init();
break;
case BG_TILE:
tile_init();
break;
}
}
void bg_work()
{
if(akt_bgtype<0) {
error(ERR_WARN,"bg_work with no bg_type");
return;
}
if(bg_alpha<255)
bg_alpha+=4*fps_factor;
else
bg_alpha=255;
switch(akt_bgtype) {
case BG_BLACK:
SDL_FillRect(screen,NULL,SDL_MapRGB(screen->format,0,0,0));
break;
case BG_CLOUDS:
// SDL_FillRect(screen,NULL,SDL_MapRGB(screen->format,0,0,0xff));
SDL_FillRect(screen,NULL,SDL_MapRGB(screen->format,0,0,bg_alpha));
break;
case BG_STARS:
SDL_FillRect(screen,NULL,SDL_MapRGB(screen->format,0,0,0));
break;
case BG_TILE:
tile_work();
tile_display();
break;
}
}
void bg_destroy()
{
if(akt_bgtype<0) {
error(ERR_WARN,"bg_destroy with no bg_type");
return;
}
switch(akt_bgtype) {
case BG_BLACK:
break;
case BG_CLOUDS:
clouds_remove();
break;
case BG_STARS:
// stars_remove();
break;
case BG_TILE:
tile_remove();
break;
}
akt_bgtype=-1;
}
void clouds_init()
{
int i;
CLOUDS_DATA *d;
for(i=0;i<20;i++) {
w3[i]=sprite_add_file("wolke03.bmp",1,PR_BACK0);
w3[i]->x=rand()%WIDTH-w3[i]->w;
w3[i]->y=rand()%HEIGHT;
w3[i]->flags&=~SP_FLAG_COLCHECK;
w3[i]->flags|=SP_FLAG_VISIBLE;
w3[i]->type=SP_ETC;
w3[i]->mover=clouds_mover;
d=mmalloc(sizeof(CLOUDS_DATA));
w3[i]->data=d;
w3[i]->alpha=bg_alpha;
d->speed_base=1;
d->speed_rand=(double)(rand()%100)/100;
}
for(i=0;i<10;i++) {
w2[i]=sprite_add_file("wolke02.bmp",1,PR_BACK1);
w2[i]->x=rand()%WIDTH-w2[i]->w;
w2[i]->y=rand()%HEIGHT;
w2[i]->flags&=~SP_FLAG_COLCHECK;
w2[i]->flags|=SP_FLAG_VISIBLE;
w2[i]->type=SP_ETC;
w2[i]->mover=clouds_mover;
d=mmalloc(sizeof(CLOUDS_DATA));
w2[i]->data=d;
w2[i]->alpha=bg_alpha;
d->speed_base=2;
d->speed_rand=(double)(rand()%100)/100;
}
for(i=0;i<5;i++) {
w1[i]=sprite_add_file("wolke01.bmp",1,PR_BACK2);
w1[i]->x=rand()%WIDTH-w1[i]->w;
w1[i]->y=rand()%HEIGHT;
w1[i]->flags&=~SP_FLAG_COLCHECK;
w1[i]->flags|=SP_FLAG_VISIBLE;
w1[i]->type=SP_ETC;
w1[i]->mover=clouds_mover;
d=mmalloc(sizeof(CLOUDS_DATA));
w1[i]->data=d;
w1[i]->alpha=bg_alpha;
d->speed_base=2;
d->speed_rand=(double)(rand()%100)/100;
}
}
void clouds_remove()
{
int i;
for(i=0;i<20;i++) {
if(i<5) w1[i]->type=-1;
if(i<10) w2[i]->type=-1;
w3[i]->type=-1;
}
}
void clouds_mover(SPRITE *c)
{
CLOUDS_DATA *d=(CLOUDS_DATA *)c->data;
c->y+=d->speed_base*fps_factor;
c->y+=d->speed_rand*fps_factor;
if(c->y>HEIGHT) {
c->y-=HEIGHT+c->w;
d->speed_rand=(double)(rand()%100)/100;
c->x=rand()%WIDTH-c->w;
c->alpha=bg_alpha;
}
}
void tile_init()
{
if(btile==NULL) {
btile=loadbmp("back02.bmp");
}
btile_y=0;
}
void tile_work()
{
btile_y+=fps_factor;
if(btile_y>btile->h-1)
btile_y-=btile->h;
}
void tile_display()
{
int i,j;
SDL_Rect r;
if(bg_alpha<255) {
SDL_FillRect(screen,NULL,SDL_MapRGB(screen->format,0,0,0));
SDL_SetAlpha(btile,SDL_SRCALPHA,bg_alpha);
} else
SDL_SetAlpha(btile,SDL_SRCALPHA,255);
r.w=btile->w;
r.h=btile->h;
for(i=0;i<WIDTH;i+=btile->w) {
for(j=-btile->h;j<HEIGHT;j+=btile->h) {
r.x=i;
r.y=j+btile_y;
SDL_BlitSurface(btile,NULL,screen,&r);
}
}
}
void tile_remove()
{
if(btile!=NULL)
unloadbmp_by_surface(btile);
btile=NULL;
}
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