init commit

lazyfoodSDL/02_image/02_image.cpp

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+/*This source code copyrighted by Lazy Foo' Productions (2004-2015)
+and may not be redistributed without written permission.*/
+
+//Using SDL and standard IO
+#include <SDL2/SDL.h>
+#include <stdio.h>
+
+//Screen dimensions
+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;
+
+//The image we will load and show on the screen
+SDL_Surface* gHelloWorld = NULL;
+
+bool init(){
+	//Initialization flag
+	bool success = true;
+
+	//Initialize SDL
+	if( SDL_Init( SDL_INIT_VIDEO ) < 0 )
+	{
+		printf("SDL could not init! 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
+		{
+			//Get window surface
+			gScreenSurface = SDL_GetWindowSurface( gWindow );
+		}
+	}
+		return success;
+}
+
+
+bool loadMedia()
+{
+	//Loading success flag
+	bool success = true;
+
+	//Load splash image
+	gHelloWorld = SDL_LoadBMP( "images/hello_world.bmp" );
+	if( gHelloWorld == NULL )
+	{
+		printf( "Unable to load image %s! SDL Error: %s\n", "images/hello_world.bmp", SDL_GetError() );
+	}
+	return success;
+}
+
+void close()
+{
+	//Deallocate surface
+	SDL_FreeSurface( gHelloWorld );
+	gHelloWorld = NULL;
+
+	//Destroy window
+	SDL_DestroyWindow( gWindow );
+	gWindow = NULL;
+
+	//Quit SDL subsystems
+	SDL_Quit();
+}
+
+int main( int argc, char* args[] )
+{
+	//Start up SDL and create window
+	if( !init() )
+	{
+		printf( "Failed to init!\n" );
+	}
+	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 );
+
+			//Wait two seconds
+			SDL_Delay( 2000 );
+		}
+	}
+	//Free resources and close SDL
+	close();
+	
+	return 0;
+}

lazyfoodSDL/02_image/Makefile

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+#OBJS specifies which files to compile as part of the project
+OBJS = 02_image.cpp
+
+#CC specifies which compiler to use
+CC = clang
+
+#COMPILER_FLAGS specifies the additional compilation options we're using
+# -w suppress all warnings
+COMPILER_FLAGS = -w
+
+#LINKER_FLAGS specifies the libraries we're linking against
+LINKER_FLAGS = -lSDL2
+
+#OBJ_NAME specifies the name of our executable
+OBJ_NAME= 02_image
+
+#This is the target that compiles our executable
+all	:	$(OBJS)
+	$(CC) $(OBJS) $(COMPILER_FLAGS) $(LINKER_FLAGS) -o $(OBJ_NAME)
+