hello
i would like to know if someone have time why my simple sdl2 c++ program
don't works as intended in html
https://gist.github.com/bussiere/c9828f513ddae1f554e7
it only show the second image after six seconds
the compiled binary worked as intended
thanks
Bussiere
code below :
/*This source code copyrighted by Lazy Foo' Productions (2004-2013)
and may not be redistributed without written permission.*/
/*
i compile it with :
/home/bussiere/Lib/emsdk_portable/emscripten/master/./emcc
02_getting_an_image_on_the_screen.cpp -s USE_SDL=2 -s LEGACY_GL_EMULATION=1 -o
sdl2.html --preload-file hello_world.bmp --preload-file hello_world2.bmp
and the html file only who the second image after six econd of blank
*/
//Using SDL and standard IO
#include <SDL2/SDL.h>
#include <stdio.h>
#ifdef __EMSCRIPTEN__
#include <emscripten.h>
#endif
//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;
//The image we will load and show on the screen
SDL_Surface* gHelloWorld = NULL;
SDL_Surface* gHelloWorld2 = NULL;
bool init()
{
//Initialization flag
bool success = true;
//Initialize SDL
if( SDL_Init( SDL_INIT_VIDEO ) < 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
{
//Get window surface
gScreenSurface = SDL_GetWindowSurface( gWindow );
}
}
return success;
}
bool loadMedia()
{
//Loading success flag
bool success = true;
//Load splash image
gHelloWorld = SDL_LoadBMP( "hello_world.bmp" );
if( gHelloWorld == NULL )
{
printf( "Unable to load image %s! SDL Error: %s\n",
"02_getting_an_image_on_the_screen/hello_world.bmp", SDL_GetError() );
success = false;
}
gHelloWorld2 = SDL_LoadBMP("hello_world2.bmp" );
if( gHelloWorld2 == NULL )
{
printf( "Unable to load image %s! SDL Error: %s\n",
"02_getting_an_image_on_the_screen/hello_world.bmp", SDL_GetError() );
success = false;
}
return success;
}
void close()
{
SDL_FreeSurface( gHelloWorld2 );
gHelloWorld2 = 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 initialize!\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( 6000 );
SDL_FreeSurface( gHelloWorld );
gHelloWorld = NULL;
//Apply the image
SDL_BlitSurface( gHelloWorld2, NULL, gScreenSurface,
NULL );
//Update the surface
SDL_UpdateWindowSurface( gWindow );
//Wait two seconds
SDL_Delay( 2000 );
}
}
//Free resources and close SDL
close();
return 0;
}
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