supporting imgui_demo.d

[yosikawa]

Hello,

I'm working to support imgui_demo.d, D-lang version of imgui_demo.cpp.
It will show how to use DerelictImgui and demonstrate it works fine.
I need some arrange and bug fix of cimgui as well.
It will become available soon and let me contribute the code.

Regards, Aki.

[extrawurst]

sure go ahead! looking forward

[yosikawa]

Hello,

It seems that my proposal is difficult to be accepted.
Provably it's better to open my own project as an forked project of this?

I also planning to add another API which is suitable for D-lang.
Usually Derelict series of library is simple binding for DLL. But it is
sometimes not suitable to use with D-lang because ImGui is designed for C++.

For example, this is igInputFloat3 function provided by cimgui.
alias da_igInputFloat3 = bool function(const char* label, ref float[3] v, int decimal_precision = -1, ImGuiInputTextFlags extra_flags = 0);

and this is one of it's usage.
static float[4] vec4a = [ 0.10f, 0.20f, 0.30f, 0.44f ];
igInputFloat3("input float3", vec4a[0..3]);

Here, igInputFloat3 wont accept vec4a because it does not match with ref float[3].
I like to provide thin wrapper for D-lang that support following call for example.
digInputFloat!3("input float3", vec4a);

Other example is igText:
alias da_igText = void function(const char* fmt, ...);

It calls C's formatting function. And it expects Zero-terminated string.
It's much better to provide D-lang version of igText that accepts D's formatting arguments.
void digText(Char, Args...)(in Char[] fmt, Args args) if (isSomeChar!Char);

I think I will open another project. How do you think?
Do you mind if I state it is forked project of DerelictImgui by Extrawurst?

Regards, Aki.

[extrawurst]

sorry it went unnoticed, cause it did not mention the issue.

i merged it now: #13

thanks for the help!