//app.Flip();
void cApp_Flip() {SDL_Flip(m_Screen);}
app.cApp_InitWindow(SCREEN_H, SCREEN_W, SDL_HWSURFACE | SDL_DOUBLEBUF)
//which is:
bool ret = (app.cApp_Init(SDL_INIT_VIDEO) &&
app.cApp_InitWindow(SCREEN_H, SCREEN_W, SDL_HWSURFACE | SDL_DOUBLEBUF) &&
app.cApp_AddImage("Paddle.bmp") &&
app.cApp_AddImage("Paddle.bmp") &&
app.cApp_AddImage("Ball.bmp"));
Quote:Original post by Drew_Benton
Chances are your m_Screen is NULL or some random value because you did not properly initilize it. Just to see if I'm right, try:
void cApp_Flip() {SDL_Flip(SDL_GetVideoSurface());}
If it works fine now, you will need to make your code assign m_Screen a proper value: m_Screen = SDL_GetVideoSurface(); after you initialize SDL and create your display window.
If it doesn't work, make sure that function is not being called before you initialize SDL and your display window.
Quote:Original post by dudedbz1
I'm pretty sure m_Screen isnt null, or else my above code snippet's "ret" would be false and the program would quit before the flip...
Quote:Original post by Drew_BentonQuote:Original post by dudedbz1
I'm pretty sure m_Screen isnt null, or else my above code snippet's "ret" would be false and the program would quit before the flip...
Oh ok, so in your cApp_InitWindow function, you have something like this:
m_Screen = SDL_SetVideoMode(SCREEN_W, SCREEN_H, bpp, flags)
Also just noting you pass in the heigth then the width 1st in your code, is your function handling that properly. Other than that, only reason I could see it crash is with an invalid surface, what do all your functions look like: cApp_Init, cApp_InitWindow, and cApp_AddImage. Also you might want to try not putting all of those in that one line, break it up to make sure things are getting called in the right order:
int error = 0;
error += app.cApp_Init(SDL_INIT_VIDEO);
error += app.cApp_InitWindow(SCREEN_H, SCREEN_W, SDL_HWSURFACE | SDL_DOUBLEBUF);
error += app.cApp_AddImage("Paddle.bmp");
error += app.cApp_AddImage("Paddle.bmp");
error += app.cApp_AddImage("Ball.bmp");
Now if error > 0, then one of them failed (assuming your return 0 on no error and 1 on error), and you are sure they all got called in the right order.
bool cApp::cApp_Init(unsigned int flags, bool text){ if (SDL_Init(flags) == -1) return false; if (text) { if (TTF_Init() == -1) return false; _TextOn = true; } else _TextOn = false; return true;}bool cApp::cApp_InitWindow(int h, int w, unsigned int flags){ m_Screen = SDL_SetVideoMode(w, h, 0, flags); if (m_Screen == NULL) return false; return true;}bool cApp::cApp_AddImage(const char *fileName){ Image *imageToAdd = new Image; imageToAdd->SetSprite(IMG_Load(fileName)); if (imageToAdd->GetSprite() == NULL) { delete imageToAdd; return false; } m_Graphics.push_back(imageToAdd); return true;}Quote:Original post by rip-off
SDL_Flip returns an int.
if its -1 then there was an error.
if theres an error then cout << SDL_GetError() << endl;
also, you might want to try
SDL_UpdateRect( SDL_GetVideoSurface() , 0, 0, 0, 0)
it an alternative to SDL_Flip, but doesnt do double buffering. you could try it out though to see if it still crashes. BTW, there is nothing in sdterr.txt, is there?
do you ever call SDL_LockSurface( m_screen ) ? thats the only reason i could think of it failing...
Quote:Original post by dudedbz1Quote:Original post by rip-off
SDL_Flip returns an int.
if its -1 then there was an error.
if theres an error then cout << SDL_GetError() << endl;
also, you might want to try
SDL_UpdateRect( SDL_GetVideoSurface() , 0, 0, 0, 0)
it an alternative to SDL_Flip, but doesnt do double buffering. you could try it out though to see if it still crashes. BTW, there is nothing in sdterr.txt, is there?
do you ever call SDL_LockSurface( m_screen ) ? thats the only reason i could think of it failing...
YES YES YES!!! Thanks sooo much.
Anyways, SDL_UpdateRect(...) works... But why? I'm using SDL_DOUBLEBUF, so why would it work and SDL_Flip() fail? The screen is not locked. There is nothing in stderr.txt. Anyone have any ideas why?
