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digitalmars.D.learn - Can someone explain how glfw3.dll gets created?

reply "WhatMeWorry" <kheaser gmail.com> writes:
I have a simple GLFW3 program running in Visual D integrated 
shell, that kept aborting at DerelictFLFW3.load() with a "failed 
to load the shared libraries: glfw3.dll.'

So I found a glfw3.dll somewhere and moved it into the project 
folder (I know this is bad technique) and that fixed the problem.

But now I'm wondering were this glfw3.dll came from.

I rebuildt the DerelictGLFW3 with dub as per the instructions.

E:\DerelictGLFW3-master>dub build
Building derelict-glfw3 ~master configuration "library", build 
type debug.
Running dmd...

And I see
E:\DerelictGLFW3-master\source\derelict\glfw3\glfw3.d  which is 
used for compile time.

And the
E:\DerelictGLFW3-master\lib\DerelictGLFW3.lib which is the static 
library required at link time.

But I couldn't find any glfw3.dll under the 
E:\DerelictGLFW3-master path.


I did however, find these lines in the DerelictGLFW3/glfw3.d code:
...
static if( Derelict_OS_Windows )
    enum libNames = "glfw3.dll";
. . .
class DerelictGLFW3Loader : SharedLibLoader {
     public this() {
         super( libNames );
     }

     protected override void loadSymbols() {
         bindFunc( cast( void** )&glfwInit, "glfwInit" );
         bindFunc( cast( void** )&glfwTerminate, "glfwTerminate" );
         bindFunc( cast( void** )&glfwGetVersion, "glfwGetVersion" 
);
         bindFunc( cast( void** )&glfwGetVersionString, 
"glfwGetVersionString" );
         bindFunc( cast( void** )&glfwSetErrorCallback, 
"glfwSetErrorCallback" );
  ...

But I don't believe this will create the glfw3.dll file?  If I'm 
correct, how, when and where is glfw3.dll created.

thanks as always.
Oct 13 2014
next sibling parent "Kapps" <opantm2+spam gmail.com> writes:
Derelict provides bindings to C libraries, and loads them at 
runtime. So glfw3.dll is actually an existing C library (you can 
get it at http://www.glfw.org/download.html), which Derelict 
provides bindings for. Derelict / your code does not generate the 
actual dll.
Oct 13 2014
prev sibling next sibling parent "John Colvin" <john.loughran.colvin gmail.com> writes:
On Monday, 13 October 2014 at 20:21:56 UTC, WhatMeWorry wrote:

 I have a simple GLFW3 program running in Visual D integrated 
 shell, that kept aborting at DerelictFLFW3.load() with a 
 "failed to load the shared libraries: glfw3.dll.'

 So I found a glfw3.dll somewhere and moved it into the project 
 folder (I know this is bad technique) and that fixed the 
 problem.

 But now I'm wondering were this glfw3.dll came from.

 I rebuildt the DerelictGLFW3 with dub as per the instructions.

 E:\DerelictGLFW3-master>dub build
 Building derelict-glfw3 ~master configuration "library", build 
 type debug.
 Running dmd...

 And I see
 E:\DerelictGLFW3-master\source\derelict\glfw3\glfw3.d  which is 
 used for compile time.

 And the
 E:\DerelictGLFW3-master\lib\DerelictGLFW3.lib which is the 
 static library required at link time.

 But I couldn't find any glfw3.dll under the 
 E:\DerelictGLFW3-master path.


 I did however, find these lines in the DerelictGLFW3/glfw3.d 
 code:
 ...
 static if( Derelict_OS_Windows )
    enum libNames = "glfw3.dll";
 . . .
 class DerelictGLFW3Loader : SharedLibLoader {
     public this() {
         super( libNames );
     }

     protected override void loadSymbols() {
         bindFunc( cast( void** )&glfwInit, "glfwInit" );
         bindFunc( cast( void** )&glfwTerminate, "glfwTerminate" 
 );
         bindFunc( cast( void** )&glfwGetVersion, 
 "glfwGetVersion" );
         bindFunc( cast( void** )&glfwGetVersionString, 
 "glfwGetVersionString" );
         bindFunc( cast( void** )&glfwSetErrorCallback, 
 "glfwSetErrorCallback" );
  ...

 But I don't believe this will create the glfw3.dll file?  If 
 I'm correct, how, when and where is glfw3.dll created.

 thanks as always.


Derelict-glfw3 is just d bindings and a loader for the glfw3 
library. The actual implementation of glfw (i.e. what you would 
find in glfw3.dll) is a separate project, which you can find the 
source for here http://www.glfw.org
Oct 13 2014
prev sibling parent Mike Parker <aldacron gmail.com> writes:
On 10/14/2014 5:21 AM, WhatMeWorry wrote:

 I have a simple GLFW3 program running in Visual D integrated shell, that
 kept aborting at DerelictFLFW3.load() with a "failed to load the shared
 libraries: glfw3.dll.'

 So I found a glfw3.dll somewhere and moved it into the project folder (I
 know this is bad technique) and that fixed the problem.

 But now I'm wondering were this glfw3.dll came from.


Others have already answered your specific question, but I would just 
like to point out that their answers are generally true for any Derelict 
package you use. Derelict binds to C libraries, or C++ libraries with C 
interfaces, so that they are usable from D. When you add Derelict to 
your dub configuration, or in your Visual D build settings, all you are 
getting are the D files allow you to interface with the C libraries -- 
you are not getting the C libraries themselves. On Windows, in most 
cases you have to go out and either download a prebuilt binary or 
download and compile the C source yourself. I say /most cases/ because 
OpenGL will already be on your system as part of your graphics driver 
and you may already have another library or two installed in your system 
directories (like OpenAL, perhaps).

Furthermore, Derelict is a /dynamic/ binding in that it loads the shared 
libraries at runtime and has absolutely no compile time dependency on 
any of them. This is why you have to call DerelictFoo.load(). That looks 
for the library on the system path and, if found, loads it into memory 
so that you can start calling into it.

So if you are going to use GLFW, SDL, or anything else, you need to go 
to that project's web site and use their documentation to understand how 
to build (if they don't provide binaries) and use those libraries, then 
make sure that the compiled DLLs are on the system path (meaning, 
usually, in the executable's directory).

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Oct 14 2014