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So I set out to create an OSD overlay for the sdl/opengl iphone player I've been building.

Please look at this picture before reading more.

http://web.me.com/cannonwc/Site_4/Photos.html#1

But How to translate the uikit touches to an sdl event, turns out it was a lot easier than I thought.

Here's how.

1) first lets create a simple event loop, for simplicity lets include only a few events.

SDL_Event event;
double incr, pos, frac;
int done = 0;
while (!done) {
SDL_WaitEvent(&event);
switch(event.type) {
case SDL_KEYDOWN:
switch(event.key.keysym.sym) {
case SDLK_f:
toggle_full_screen();
break;
case SDLK_F11:
do_exit(&done);
break;
default:
sdl_quit;
fprintf(stdout, "Release control");
break;



Now on the iphone uikit HUDView.m we create the button bar.

Again for simplicity we will only show the quit_event we are handling.

UIButton *quitButton = [[UIButton alloc] initWithFrame:CGRectMake(200, 10, 48.0f, 48.0f)];
[quitButton setBackgroundImage:[[UIImage imageNamed:@"quit.png"] stretchableImageWithLeftCapWidth:48.0 topCapHeight:0.0] forState:UIControlStateNormal];
//[stopButton setCenter:CGPointMake(195.0f, 208.0f)];
quitButton.backgroundColor = [UIColor colorWithWhite:0 alpha:0];
[quitButton addTarget:self action:@selector(quitClicked)
forControlEvents:UIControlEventTouchUpInside];
[self addSubview:quitButton];



//Notice the selector

//when we click the quitbutton the quitClicked method is called.



//we create an event simulating pressing the f11 key.

-(void)quitClicked {

SDL_KeyboardEvent event;
event.type = SDL_KEYDOWN;
event.which = 0;
event.state = SDL_PRESSED;
event.keysym.sym = SDLK_F11;
SDL_PushEvent((SDL_Event*)&event); // Send the F11 key press
event.type = SDL_KEYUP;
event.state = SDL_RELEASED;
SDL_PushEvent((SDL_Event*)&event); // Send the F11 key release

}


//Thats all


To see the viewer in action you can see this on youtube

http://www.youtube.com/watch?v=Rdb0eKhmH4Q

Very cool, thanks for the tutorial!

On Fri, Mar 26, 2010 at 9:38 PM, michelleC wrote:



--
-Sam Lantinga, Founder and President, Galaxy Gameworks LLC
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