Error with clearing screen

[joelcnz]

import derelict.allegro5;

import std.stdio: writeln;

ALLEGRO_DISPLAY* DISPLAY;

int main() {
    DerelictAllegro5.load();

	DerelictAllegro5.run( {
		if (! al_init()) {
			writeln("failed to initialize allegro!");
			return -1;
		}

		DISPLAY = al_create_display( 640, 480 );
		assert(DISPLAY, "failed to create display");
		scope(exit) al_destroy_display( DISPLAY );

		al_clear_to_color(al_map_rgb(255,180,0)); //#error return value -11
		al_flip_display();

		al_rest(2);

		return 0;
	} );

	return 0;
}

[mdparker]

Joel, if you have bugs with DerelictAllegro5, this is definitely the place to post them. But this is not an Allegro support forum. I don't use Allegro that much myself and for me to help you would require me to dig into the Allegro docs and debug your programs for you. I don't have time for that. Please take issues like this to the Allegro forums at allegro.cc if you can't solve them yourself. If you later determine a problem is with the binding, then by all means report it here.

[mdparker]

Alright, I need you to clarify something. When you said "error return value", it sounded like you were talking about the return value of a function. But are you actually talking about a message you're getting from the system?

[joelcnz]

Yes, it displays "Program exited with code -11" in the terminal, when I run the program.

[joelcnz]

Also, I posted it on allegro.cc and some one said that the code worked on DAllegro, using Linux.

[mdparker]

I've tested your code on my MacBook and it crashes for me, too. Running in the debugger shows a segmentation fault. Looks like it's a thread-related issue. Marking DISPLAY as __gshared or moving the declaration inside the function literal makes the crash go away.

I recommend using __gshared on any of your globals for now, just as a temporary workaround until I can figure out how to solve this.

[joelcnz]

It doesn't crash with __gshared, but it doesn't give me the colour either.

Also, if I use a bitmap with it it crashes again:

		ALLEGRO_BITMAP* bmp = al_create_bitmap(640,480);
		assert(bmp, "create bitmap failed!");
		scope(exit) al_destroy_bitmap( bmp );
		al_set_target_bitmap(bmp);
		al_clear_to_color(al_map_rgb(255,180,0));

How did you run the program in a debugger? Some one said about using a debugger before your post.

[mdparker]

When you install XCode, you get the clang tools, which includes the lldb debugger. Run lldb <program_name> to debug. You'll want to compile your D programs with -gc (though -g might work as well with lldb, these days, don't know), so add that to a dflags field in your dub configuration.

I've had nothing but trouble trying to bind dynamically with Allegro. These Mac issues are just more in a long line of them. I may end up abandoning this completely and just directing people to DAllegro. Never had issues with like this with any other C library I've created a Derelict binding for.

[joelcnz]

Thanks for your replies. I'll look at DAllegro next, (I have an old version on a Windows computer to update. It didn't have dub back then).