sdl2forthewin/main.cpp

/*This source code copyrighted by Lazy Foo' Productions (2004-2022)
and may not be redistributed without written permission.*/

//Using SDL and standard IO
#include <SDL.h>
#include <stdio.h>
#include <SDL_mixer.h>

//Screen dimension constants
const int SCREEN_WIDTH = 640;
const int SCREEN_HEIGHT = 480;

//Starts up SDL and creates window
bool init();

//Loads media
bool loadMedia();

//Frees media and shuts down SDL
void close();

//The window we'll be rendering to
SDL_Window* gWindow = NULL;
	
//The surface contained by the window
SDL_Surface* gScreenSurface = NULL;

SDL_Renderer* gRenderer = NULL;

//The image we will load and show on the screen
SDL_Surface* gHelloWorld = NULL;

Mix_Music* gMusic = NULL;

bool init()
{
	//Initialization flag
	bool success = true;
    char* data_path = NULL;
    data_path = SDL_GetBasePath();
//     printf("path: %s",data_path);
    
	//Initialize SDL
	if( SDL_Init( SDL_INIT_VIDEO | SDL_INIT_AUDIO ) < 0 )
	{
		printf( "SDL could not initialize! SDL_Error: %s\n", SDL_GetError() );
		success = false;
	}
	else
	{
		//Create window
		gWindow = SDL_CreateWindow( "SDL Tutorial", SDL_WINDOWPOS_UNDEFINED, SDL_WINDOWPOS_UNDEFINED, SCREEN_WIDTH, SCREEN_HEIGHT, SDL_WINDOW_SHOWN );
		if( gWindow == NULL )
		{
			printf( "Window could not be created! SDL_Error: %s\n", SDL_GetError() );
			success = false;
		}
		else
		{
            			//Create vsynced renderer for window
			gRenderer = SDL_CreateRenderer( gWindow, -1, SDL_RENDERER_ACCELERATED | SDL_RENDERER_PRESENTVSYNC );
			if( gRenderer == NULL )
			{
				printf( "Renderer could not be created! SDL Error: %s\n", SDL_GetError() );
				success = false;
			}
        //Get window surface
        gScreenSurface = SDL_GetWindowSurface( gWindow );
		}
		
        //Initialize SDL_mixer
        if (Mix_OpenAudio(44100, MIX_DEFAULT_FORMAT, 2, 2048)<0)
        {
            SDL_LogError(SDL_LOG_CATEGORY_ERROR, "Couldn't initialize SDL audio mixer!, Error: %s", SDL_GetError());
        }
        
	}
	
	return success;
}

bool loadMedia()
{
	//Loading success flag
	bool success = true;

	//Load splash image
	gHelloWorld = SDL_LoadBMP( "../hello-sdl.bmp" );
	if( gHelloWorld == NULL )
	{
		printf( "Unable to load image %s! SDL Error: %s\n", "hello-sdl.bmp", SDL_GetError() );
		success = false;
	}

	gMusic = Mix_LoadMUS("../sillypuppy.ogg");
    if(gMusic == NULL)
    {
        printf("Failed to load music! SDL_mixer Error: %s\n", Mix_GetError());
        success = false;
    }
	
	return success;
}

void close()
{
	//Deallocate surface
	SDL_FreeSurface( gHelloWorld );
	gHelloWorld = NULL;

	//Destroy window
	SDL_DestroyWindow( gWindow );
	gWindow = NULL;
    
    Mix_FreeMusic(gMusic);
    gMusic = NULL;

	//Quit SDL subsystems
	SDL_Quit();
}

int main( int argc, char* args[] )
{
	//Start up SDL and create window
	if( !init() )
	{
		printf( "Failed to initialize!\n" );
	}
	
	else
	{
		//Load media
		if( !loadMedia() )
		{
			printf( "Failed to load media!\n" );
		}
		else
		{	
			//Main loop flag
			bool quit = false;

			//Event handler
			SDL_Event e;

			//While application is running
			while( !quit )
			{
				//Handle events on queue
				while( SDL_PollEvent( &e ) != 0 )
				{
					//User requests quit
					if( e.type == SDL_QUIT )
					{
						quit = true;
					}
					//Handle key press
					else if( e.type == SDL_KEYDOWN )
					{
						switch( e.key.keysym.sym )
						{
// 							Play high sound effect
// 							case SDLK_1:
// 							Mix_PlayChannel( -1, gHigh, 0 );
// 							break;
// 							
// 							Play medium sound effect
// 							case SDLK_2:
// 							Mix_PlayChannel( -1, gMedium, 0 );
// 							break;
// 							
// 							Play low sound effect
// 							case SDLK_3:
// 							Mix_PlayChannel( -1, gLow, 0 );
// 							break;
// 							
// 							Play scratch sound effect
// 							case SDLK_4:
// 							Mix_PlayChannel( -1, gScratch, 0 );
// 							break;
							
							case SDLK_9:
							//If there is no music playing
							if( Mix_PlayingMusic() == 0 )
							{
								//Play the music
								Mix_PlayMusic( gMusic, -1 );
							}
							//If music is being played
							else
							{
								//If the music is paused
								if( Mix_PausedMusic() == 1 )
								{
									//Resume the music
									Mix_ResumeMusic();
								}
								//If the music is playing
								else
								{
									//Pause the music
									Mix_PauseMusic();
								}
							}
							break;
							
							case SDLK_0:
							//Stop the music
							Mix_HaltMusic();
							break;
						}
					}
				}

				//Clear screen
				SDL_SetRenderDrawColor( gRenderer, 0xFF, 0xFF, 0xFF, 0xFF );
				SDL_RenderClear( gRenderer );

// 			    Apply the image
                SDL_BlitSurface( gHelloWorld, NULL, gScreenSurface, NULL );
// 			
// 			    Update the surface
                SDL_UpdateWindowSurface( gWindow );
                
				//Render prompt
// 				gPromptTexture.render( 0, 0 );

				//Update screen
				SDL_RenderPresent( gRenderer );
			}
		}
	}

// 	else
// 	{
// 		Load media
// 		if( !loadMedia() )
// 		{
// 			printf( "Failed to load media!\n" );
// 		}
// 		else
// 		{
// 			Apply the image
// 			SDL_BlitSurface( gHelloWorld, NULL, gScreenSurface, NULL );
// 			
// 			Update the surface
// 			SDL_UpdateWindowSurface( gWindow );
// 
//             Hack to get window to stay up
//             SDL_Event e; bool quit = false; while( quit == false ){ while( SDL_PollEvent( &e ) ){ if( e.type == SDL_QUIT ) quit = true; } }
// 
// 		if (Mix_PlayingMusic() == 0)
//         {
//             printf("Playing Music...");
// 
//             gMusic = Mix_LoadMUS("../sillypuppy.ogg");
//             Mix_PlayMusic(gMusic, -1);
//         }
//         if (Mix_PlayingMusic() != 0)
//         {
//             Mix_HaltMusic();
//         }
// 		}        
// 	}

	//Free resources and close SDL
	close();

	return 0;
}