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.
