Derelict / SDL error

[Paul via Digitalmars-d-learn]

On Wednesday, 10 December 2014 at 18:06:08 UTC, Paul wrote:
> On Wednesday, 10 December 2014 at 16:58:57 UTC, Mike Parker 
> wrote:
>> On 12/11/2014 12:31 AM, Paul wrote:
>>
>>>
>>> This thread has degenerated into a discussion of the set up 
>>> of my OS
>>> which is miles off topic and should probably be abandoned.
>>
>> Maybe not. The trouble is that others have been able to 
>> compile and run the same code without error. Given that you 
>> are still unable to, that puts your system configuration in 
>> the spotlight. Your error with libpng points even more in that 
>> direction. If that turns out to be the culprit, it wouldn't be 
>> the first time someone has had run-time errors because of 
>> something not quite right on their system.
>>
>> Without a failure that others can reproduce, there's not much 
>> for anyone to do other than make (hopefully educated) guesses. 
>> I'm happy to keep doing so until it's either resolved or I run 
>> out of ideas.
>
> I appreciate that Mike, I would really like to get this sorted 
> so I can get on with learning D. I read up on the procedure for 
> building the latest libpng which I did. It gives same error 
> message as using the earlier version.
>
> It seems to me that trying to use SDL_image rather than the 
> 'built in' *.bmp handling might be compounding the problem 
> (unless libpng is called upon to render bmps as well?). I don't 
> know what to try next I'm afraid.

On another of my machines (64 bit Linux 17 XFCE) I've just 
installed dmd (64 bit) and dub binary, xorg-dev (includes libpng 
1.2.50) and built SDL2. This program now works without any errors:

import derelict.sdl2.sdl;
import std.stdio;
import std.conv;



void main()
{


     DerelictSDL2.load();

     scope(exit) SDL_Quit();

     //init sdl
	if (SDL_Init(SDL_INIT_EVERYTHING) != 0){
		writeln("SDL_Init Error: ", to!string( SDL_GetError() ));
		return;
	}
		
	//open a window
	SDL_Window *window = SDL_CreateWindow("Window Title!", 100, 100, 
640, 480, SDL_WINDOW_SHOWN);
	if (window == null){
		writeln("SDL_CreateWindow Error: ", to!string(SDL_GetError() ));
		return;
	}	
		
	//get a renderer (ie buffer), use software renderer for now
	SDL_Renderer *renderer = SDL_CreateRenderer(window, -1, 
SDL_RENDERER_SOFTWARE);
	if (renderer == null){
		writeln( "SDL_CreateRenderer Error: " , to!string( 
SDL_GetError() ));
		return;
	}
	
	//load a bitmap
	SDL_Surface *image = SDL_LoadBMP("./test.bmp");
	if (image == null){
		writeln( "SDL_LoadBMP error: " , to!string(SDL_GetError() ));
		return;
	}	
	
	//create texture for bitmap
	SDL_Texture *texture = SDL_CreateTextureFromSurface(renderer, 
image);
	if (texture == null){
		writeln( "CreateTextureFromSurface error: " , 
to!string(SDL_GetError() ));
		return;
	}		
	
     //copy to renderer at correct position & scale
     SDL_Rect sourceRect = { 0, 0, 64, 64 };
     SDL_Rect destRect = { 100, 100, 64, 64 };
     SDL_RenderCopy(renderer, texture, &sourceRect, &destRect);	
		
	
     //display and pause
     SDL_RenderPresent(renderer);
     SDL_Delay(2000);
	
		
}

The two machines on which errors occur are a Mint 13 (32 bit) box 
and an ageing laptop with Lubuntu 14.04. I've followed the same 
procedures but the 64 bit obviously has the 64 bit dmd compiler.