SDL_RenderCopy () has weird behavior in raspberry PI

Question

It pushes me against the wall.
I have a very simple SDL2 program.
It has an array of 3 SDL_Texture pointers.
These textures are filled as follows:

SDL_Texture *myarray[15];
SDL_Surface *surface;

for(int i=0;i<3;i++)
{
   char filename[] = "X.bmp";
   filename[0] = i + '0';
   surface = SDL_LoadBMP(filename);
   myarray[i] = SDL_CreateTextureFromSurface(myrenderer,surface);
   SDL_FreeSurface(surface);
}

It works, no errors.

In the main loop (which is a regular event loop waiting for SDL_QUIT, keystrokes, and a custom event that SDL_Timer puts in the event queue every second), I just do (for the timer triggered event):

idx = (idx+1) % 3;         // idx is global var initially 0.
SDL_RenderClear(myrenderer);
SDL_RenderCopy(myrenderer,  myarray[idx], NULL, NULL);
SDL_RendererPresent(myrenderer);

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Answer 1

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