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* \file
* This example program creates a window and plays a music.
* In order to make this example minimalistic, it will not use most of the
* functionalities of the Bear Engine. Consequently, we will have manage the
* exit of the program ourselves.
* The SDL is used for the subsystems of the engine. Thus we can use its event
* system to detect when the user wants to quit the program.
#include "visual/screen.hpp"
#include "audio/sound_manager.hpp"
#include "SDL2/SDL.h"
#include <fstream>
* This global variable is observed in the main loop in order to exit the
* program as it becomes true.
bool g_quit(false);
* This function processes an event of the SDL. If the quit signal has been
* sent, then g_quit is set to true. Otherwise the function does nothing.
* \param user_data Ignored.
* \param event The event to process.
int event_filter
( void* user_data, SDL_Event* event )
int result(0);
switch ( event->type )
case SDL_QUIT:
g_quit = true;
result = 1;
return result;
* Initializes the visual and audio modules of the engine and registers the
* event filter to the SDL.
void init()
bear::visual::screen::initialize( bear::visual::screen::screen_gl );
SDL_SetEventFilter( &event_filter, NULL );
* Releases the visual and audio modules of the engine.
void release()
* Creates a window and plays the music in a loop until the quit signal is
* received.
void run_example()
// A window must be created to initialize the SDL. We do not need it for the
// music but for the events that will allow to close the application.
// Here we create it; it will be immediately visible.
// The engine does not support multiples windows yet, so be careful and be
// sure to create only one of them.
// As soon as the screen is created, a render thread is created
bear::visual::screen s( claw::math::coordinate_2d<unsigned int>(640, 480) );
// Musics must be accessed through a sound manager. It will handle the loading
// of the files and the releasing of the resources when the music is over.
bear::audio::sound_manager sound_manager;
// We need to load the music into the sound manager before being able to play
// it.
std::ifstream f( "mus_1.ogg" );
sound_manager.load_sound("music", f);
std::cout << "Music by Alexandr Zhelanov. See "
// Here we start the music. The second argument is the number of times it must
// be played. Zero means to play it forever.
sound_manager.play_music( "music", 0 );
while ( !g_quit )
* Initializes the Bear Engine's modules then run the example. The modules are
* released before leaving.
int main( int argc, char* argv[] )
return 0;