Simple SDL example in C++
This is a simple SDL example. It plots a bunch of random points to the screen. On linux it will require the libsdl and libsdl-dev packages. compile it as follows:
g++ -L/usr/lib -lSDL -lpthread rand_points.c -o rand_points
#include <string.h>
#include <SDL/SDL.h>
#include <iostream>
using namespace std;
int main(int argc, char *argv[]) {
SDL_Surface *screen;
if(SDL_Init(SDL_INIT_VIDEO)<0) {
cout << "Failed SDL_Init " << SDL_GetError() << endl;
return 1;
}
screen=SDL_SetVideoMode(800,600,32,SDL_ANYFORMAT);
if(screen==NULL) {
cout << "Failed SDL_SetVideoMode: " << SDL_GetError() << endl;
SDL_Quit();
return 1;
}
for(;;) {
SDL_Flip(screen);
SDL_LockSurface(screen);
for(int n=0;n<1000;n++) {
int x=rand()%800;
int y=rand()%600;
int pixel=rand()*100000;
int bpp = screen->format->BytesPerPixel;
Uint8 *p = (Uint8 *)screen->pixels + y * screen->pitch + x * bpp;
if((x>screen->w)||(y>screen->h)||(x<0)||(y<0)) return 0;
*(Uint32 *)p = pixel;
}
SDL_Event event;
while(SDL_PollEvent(&event)) {
if(event.key.keysym.sym == SDLK_c ) { SDL_FillRect(screen,NULL,0); }
}
SDL_UnlockSurface(screen);
}
SDL_Quit();
return 0;
}
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