Problem so SDL – C / C++ – Fórum – Programujte.com

Zdar,
myslim ze som spravil viac-menej vsetko ako v seriali SDL ale nech sa snazim vykreslit cokolvek(pixel, bmp), nic sa nevykresli. Ostane len cierne SDL okno. Tu je kod pre vykreslenie bitmapy(ktory nefunguje):

#include "SDL/SDL.h"  

#include <iostream> 

#include <conio.h>  

#include <stdlib.h>  

#include <windows.h> 

using namespace std;  

  

SDL_Surface *screen;   

SDL_Surface *image;    



#include "data/func.cpp"  

  

void DrawScene(){   

  DrawIMG(image, 0, 0);   

  SDL_Flip(screen);   

}      

  

int main(int argc, char *argv[]){   

if(SDL_Init(SDL_INIT_VIDEO) < 0){   

  cout << "Could not initialize SDL: " << SDL_GetError();   

  getch();

  exit(1);   

}   

atexit(SDL_Quit);   

screen = SDL_SetVideoMode(800, 600, 32, SDL_HWSURFACE|SDL_DOUBLEBUF);   



if (screen == NULL){   

  cout << "Could not initialize screen: " << SDL_GetError();  

  getch();

  exit(1);   

}   

cout << "text"; //tento text sa ani nezobrazi v cmd okne



bool done=false;   

while(done == false){   

  SDL_Event event;   

  while( SDL_PollEvent(&event) ){   

    if( event.type == SDL_QUIT ) done=true;   

    }   

  }

  DrawScene();

}  

void LoadImages(){   

  image = SDL_LoadBMP("/data/images/noimg.bmp");   

}   

  

void DrawIMG(SDL_Surface *img, int x, int y){   

  SDL_Rect rect;   

  rect.x = x;   

  rect.y = y;   

  SDL_BlitSurface(img, NULL, screen, &rect);   

}   

func.cpp je co?

moj prispevok, poslednych 10 riadkov :smile1:

pokud je to hlavičkový soubor, tak musíš vytvořit func.h soubor a ten includovat

Tak som skusil obsah func.cpp dat namiesto #include "data/func.cpp" a stale je to to iste

a tu promennou image a fci LoadImages() pouzivas kde

S tym LoadImages() mas pravdu, nepouzival som to. Takze som dopisal LoadImages(); pred hlavny cyklus ale stale nic.
P.S.: premenna images sa pouziva v LoadImages(), a DrawScene().

a co takhle

#include "SDL/SDL.h"

#include <iostream>

#include <conio.h>

#include <stdlib.h>

#include <windows.h>

using namespace std;



SDL_Surface *LoadImages(){

  SDL_Surface *image;

  image = SDL_LoadBMP("/data/images/noimg.bmp");

  return image;

}



void DrawIMG(SDL_Surface *img, int x, int y, SDL_Surface *s){

  SDL_Rect rect;

  rect.x = x;

  rect.y = y;

  SDL_BlitSurface(img, NULL, s, &rect);

}



void DrawScene(SDL_Surface *img, SDL_Surface *s){

  DrawIMG(img, 0, 0, s);

  SDL_Flip(s);

}



int main(int argc, char *argv[]){

SDL_Surface *screen;

SDL_Surface *image;

if(SDL_Init(SDL_INIT_VIDEO) < 0){

  cout << "Could not initialize SDL: " << SDL_GetError();

  getch();

  exit(1);

}

atexit(SDL_Quit);

screen = SDL_SetVideoMode(800, 600, 32, SDL_HWSURFACE|SDL_DOUBLEBUF);



if (screen == NULL){

  cout << "Could not initialize screen: " << SDL_GetError();

  getch();

  exit(1);

}



image = LoadImages();

DrawScene(image, screen);



bool done=false;

while(done == false){

  SDL_Event event;

  while( SDL_PollEvent(&event) ){

    if( event.type == SDL_QUIT ) done=true;

    }

  }

}

skusil som, stale mam len cierne(prazdne) SDL okno

a ses vubec na linuxu? kdyz davas /data/...

taky pravda :smile4: já jsem tam tisknul svůj vlastní obrázek... a vlinuxu asi není - windows.h

Som na windowse. Data je adresar ktory je v rovnakom adresary ako .exe takze mi pride logicke dat pred neho /. Ale skusil som to dat bez toho / pred data a tiez to nejde.

To entity : jeste mozna otestovat misto / dat \\ ale s tim asi problem nebude

ano, aj to som skusil - nepomohlo

Uz to ide - aj ked nerozumiem preco. Tu cast s cyklom som zmenil na

LoadImages();

DrawScene();



bool done=false;   

while(done == false){   

  SDL_Event event;   

  while( SDL_PollEvent(&event) ){   

    if( event.type == SDL_QUIT ) done=true;   

    }   

  }

  DrawScene();

}  

./data/images/noimg.bmp
tu fci za cyklem muzes smazat

Ale ked odstranim DrawScene() z cyklu tak sa to vykresli aj tak - asi bude nejaky problem v cykle
ospravedlnujem sa za doublepost

Tak uz som to nasiel - DrawScene() nebolo vovnutri cyklu. Blba chyba co :smile18:

Nebudem zakladat nove vlakno ale hodim to sem:

Uint8 getpixelred(SDL_Surface* surface, int x, int y)

{

  Uint32 *pixels = (Uint32 *)surface->pixels;

  Uint8 r, g, b;

  SDL_PixelFormat *fmt;

  fmt=surface->format;

  SDL_GetRGB(pixels[(y* surface->w ) + x], fmt, &r, &g, &b);

  return r;

}



struct object   

{   

   bool is;

   int x;   

   int y;   

   float speedx;

   float speedy;  

}; 



object ball =   

{   

   true,

   600-20, 

   200,   

   0,

   0  

};  



if( (getpixelred(s_bckground, int(ball.x+ ball.speedx), int(ball.y+ ball.speedy))

    ||getpixelred(s_bckground, int(ball.x+ ball.speedx+ 40), int(ball.y+ ball.speedy+ 40)) )== 59){

    ball.speedx = 0- ball.speedx;

    ball.speedy = 0- ball.speedy;

  }

máš tam OR, takže výsledek asi nebude zrovna rovný 59

Okej, takze som to spravil takto

Uint8 r1,r2;



r1= getpixelred(s_bckground, int(ball.x)- 1, int(ball.y)- 1);

  r2= getpixelred(s_bckground, int(ball.x)+ 41, int(ball.y)+ 41);

  

  if(r1== 59){

    ball.speedx = 0- ball.speedx* CRASH;

    ball.speedy = 0- ball.speedy* CRASH;

  }

  if(r2== 59){

    ball.speedx = 0- ball.speedx* CRASH;

    ball.speedy = 0- ball.speedy* CRASH;

  }