SDL not responding after running for a few seconds on linux - c++

Question

I was following the SDL Game development book and I cant even get the first file to work right. Upon the application starting it renders the window and then after a few seconds Linux says the game is not responding and ask me to force quit. This repeats every few seconds if I click wait. One thing I have noticed is that SDL_PollEvent never returns true.I am not sure why things are not working. Here is my code.
Main.cpp
#ifdef __cplusplus
#include <cstdlib>
#else
#include <stdlib.h>
#endif
#include "Game.h"
// our Game object
Game* g_game = 0;
int main(int argc, char* argv[]) {
g_game = new Game();
g_game->init("Chapter 1", 100, 100, 640, 480, 0);
while(g_game->running()) {
g_game->handleEvents();
//g_game->update();
g_game->render();
}
g_game->clean();
return 0;
}
Game.h
#ifndef __Game__
#define __Game__
#if !WINDOWS
#include <SDL2/SDL.h>
#else
#include <SDL.h>
#endif
class Game {
public:
Game() {}
~Game() {}
// simply set the running variable to true
bool init(const char* title, int xpos, int ypos, int width, int
height, bool fullscreen);
void render();
void update();
void handleEvents();
void clean();
// a function to access the private running variable
bool running() {
return m_bRunning;
}
private:
SDL_Window* m_pWindow;
SDL_Renderer* m_pRenderer;
bool m_bRunning;
};
#endif /* defined(__Game__) */
Game.cpp
#include "Game.h"
#include <iostream>
bool Game::init(const char* title, int xpos, int ypos, int width,
int height, bool fullscreen) {
// attempt to initialize SDL
if(SDL_Init(SDL_INIT_EVERYTHING) == 0) {
std::cout << "SDL init success\n";
// init the window
int flags = 0;
if(fullscreen) {
flags = SDL_WINDOW_FULLSCREEN;
}
m_pWindow = SDL_CreateWindow(title, xpos, ypos,
width, height, flags);
if(m_pWindow != 0) { // window init success
std::cout << "window creation success\n";
m_pRenderer = SDL_CreateRenderer(m_pWindow, -1, 0);
if(m_pRenderer != 0) { // renderer init success
std::cout << "renderer creation success\n";
SDL_SetRenderDrawColor(m_pRenderer,
255,0,255,255);
} else {
std::cout << "renderer init fail\n";
return false; // renderer init fail
}
} else {
std::cout << "window init fail\n";
return false; // window init fail
}
} else {
std::cout << "SDL init fail\n";
return false; // SDL init fail
}
std::cout << "init success\n";
m_bRunning = true; // everything inited successfully, start the main loop
return true;
}
void Game::render() {
SDL_RenderClear(m_pRenderer); // clear the renderer to the draw color
SDL_RenderPresent(m_pRenderer); // draw to the screen
}
void Game::clean() {
std::cout << "cleaning game\n";
SDL_DestroyWindow(m_pWindow);
SDL_DestroyRenderer(m_pRenderer);
SDL_Quit();
}
void Game::handleEvents() {
SDL_Event event;
while(SDL_PollEvent(&event)) {
std::cout << "Checking Events";
switch(event.type) {
case SDL_QUIT:
std::cout << "Quiting";
m_bRunning = false;
break;
default:
break;
}
}
}
Edit:
so I made a minamal version of the code and now i get a new error. The error says "Segmentation Fault (core dumped)". Based on running it to a specific line in debug the error seems to appear at the line that says "SDL_Texture *tex = SDL_CreateTextureFromSurface(ren, bmp);" I am not sure what the error is though
Here is the minial code:
#ifdef __cplusplus
#include <cstdlib>
#else
#include <stdlib.h>
#endif
#include <iostream>
#include <SDL2/SDL.h>
int main(int argc, char** argv) {
if(SDL_Init(SDL_INIT_EVERYTHING) != 0) {
std::cout << "SDL_Init Error: " << SDL_GetError() << std::endl;
return 1;
}
SDL_Window *win = SDL_CreateWindow("Hello World!", 100, 100, 640, 480, SDL_WINDOW_SHOWN);
if(win == NULL) {
std::cout << "SDL_CreateWindow Error: " << SDL_GetError() << std::endl;
SDL_Quit();
return 1;
}
SDL_Renderer *ren = SDL_CreateRenderer(win, -1, SDL_RENDERER_ACCELERATED | SDL_RENDERER_PRESENTVSYNC);
if(ren == NULL) {
SDL_DestroyWindow(win);
std::cout << "SDL_CreateRenderer Error: " << SDL_GetError() << std::endl;
SDL_Quit();
return 1;
}
std::string imagePath = "cb.bmp";
SDL_Surface *bmp = SDL_LoadBMP(imagePath.c_str());
if(bmp == NULL) {
SDL_DestroyRenderer(ren);
SDL_DestroyWindow(win);
std::cout << "SDL_LoadBMP Error: " << SDL_GetError() << std::endl;
SDL_Quit();
return 1;
}
SDL_Texture *tex = SDL_CreateTextureFromSurface(ren, bmp);
if(tex == NULL) {
SDL_DestroyRenderer(ren);
SDL_DestroyWindow(win);
std::cout << "SDL_CreateTextureFromSurface Error: " << SDL_GetError() << std::endl;
SDL_Quit();
return 1;
}
SDL_FreeSurface(bmp);
SDL_Event e;
bool quit = false;
while(!quit) {
while(SDL_PollEvent(&e)) {
//If user closes the window
if(e.type == SDL_QUIT) {
quit = true;
}
//If user presses any key
if(e.type == SDL_KEYDOWN) {
quit = true;
}
//If user clicks the mouse
if(e.type == SDL_MOUSEBUTTONDOWN) {
quit = true;
}
}
SDL_RenderClear(ren);
SDL_RenderPresent(ren);
}
SDL_DestroyTexture(tex);
SDL_DestroyRenderer(ren);
SDL_DestroyWindow(win);
SDL_Quit();
return 0;
}

Answer 1

I have compiled and run your minimal code successfully under Linux with SDL 2.0.4. I used a simple image as "cb.bmp".
Try the following :
compile like this : g++ -Wall -ggdb $(sdl2-config --cflags) -o program main.cpp -lSDL2
gdb ./program, then type 'run'
when it crashes, type 'bt' (for backtrace)
copy the output here
My guess is : either the "bmp" file format is not supported or the rendering driver is not supported. try to use :
SDL_CreateRenderer(win, -1, 0);