Is it possible to add imgui to lwjgl?

[ejamshidiasl]

Hello
i used it in java applciation and it is really good
thanks

is it possible to add it to lwjgl glfw window?

[ice1000]

As you can see many people have paid their souls trying to achieve this but failed:
#12 #13 #18 #19 #28

[ice1000]

Contribution is welcomed

[ejamshidiasl]

i can run 2 windows side by side
but i want to run imgui window inside lwjgl
i am working on it now....

[ice1000]

i can run 2 windows side by side

wut? wut name/version/config of os/jre/lwjgl r u using?

[ice1000]

Theoretically, exposing ImGui::CreateContext should make this possible, but I haven't tried

[ice1000]

Btw,

i used it in java applciation and it is really good

what is applciation?

[ejamshidiasl]

import org.ice1000.jimgui.JImGui;
import org.ice1000.jimgui.util.JniLoader;
import org.lwjgl.glfw.GLFW;

public class Main {

    public Main(){
        GLFW.glfwInit();
        long window = GLFW.glfwCreateWindow(400,400,"window1",0,0);
        GLFW.glfwMakeContextCurrent(window);
        GLFW.glfwSwapInterval(1);

        GLFW.glfwShowWindow(window);


        JniLoader.load();
        try (JImGui imGui = new JImGui()) {
            // load fonts, global initializations, etc.
            imGui.initBeforeMainLoop();
            while (!imGui.windowShouldClose()) {
                // some drawing-irrelated initializations
                // mostly do nothing here
                imGui.initNewFrame();
                // draw your widgets here, like this
                imGui.text("Hello, World!");
                imGui.render();
            }
        }


        while (GLFW.glfwWindowShouldClose(window) == false){
            GLFW.glfwPollEvents();



        }

        GLFW.glfwTerminate();
    }

    public static void main(String[] args){
        new Main();
    }
}

[ice1000]

@ejamshidiasl you really should learn how to post codeblocks on github: https://help.github.com/en/articles/creating-and-highlighting-code-blocks

[ejamshidiasl]

thanks (for code blocks)

what is applciation? ---> application

[ice1000]

Try JImGui.fromExistingPointer

[ejamshidiasl]

OS: win 10
IDE: intellij idea
lwjgl: latest release

[ejamshidiasl]

i found something
in JImGui imGui = new JImGui() there is an argumant that gets anotherWindow handle
i am trying this now

[ice1000]

wut

[ice1000]

Try JImGui.fromExistingPointer

@ejamshidiasl

[ejamshidiasl]

wha is nativeObjectPtr?

[ejamshidiasl]

i find something cool
i think problem is in imGui.initBeforeMainLoop() function
because it loads other window handle

[ejamshidiasl]

may i ask you to change constructor?
line 222 file JImGui.java
please add input argument (long window)

[ice1000]

I was just wrapping the native API of glfw, I have no idea how they work

[ice1000]

You can use reflection to access the private initBeforeMainLoop(long) function, and prove it works, and then I can make the function public.

[ejamshidiasl]

Hello
i downloaded new version on jimgui and now i can render it to lwjgl window
but there is a problem. imgui draws on top of lwjgl so i cannot see any opengl.
maybe problem is in initNewFrame

[ice1000]

I have no idea, you can dig imgui itself if you'd like to

[zeroeightysix]

Hello
i downloaded new version on jimgui and now i can render it to lwjgl window
but there is a problem. imgui draws on top of lwjgl so i cannot see any opengl.
maybe problem is in initNewFrame

Could you post the code for / make a new repository to show how you achieved this?

[hnOsmium0001]

It occured to me that JImGui is trying to use DirectX on Windows which makes it incompatible with LWJGL. However I'm not 100% sure of this guess: is it true?
If ture, how can I manually choose to use the glfw+opengl3 version?

[ice1000]

I don't know. There used to be a glfw+ogl3 native library, but I can't recall how to use it.

[arcogabbo]

Any update for this issue? im using libgdx for a project and libgdx itself spawns a window, while imgui spawns another.
My goal was to render imgui inside the libgdx existing window.
I can have access to the libgdx windowhandle but passing it as argument to JImGui constructor doesnt seem to change anything.
Maybe im doing something wrong?

[arcogabbo]

Using gui=JImGui.fromExistingPointer(windowHandle) makes the program crash and a dump is returned.
Using gui=new JImGui(width,height,atlas,title,windowHandle) doesnt change anything, 2 windows appears anyway.

UPDATE: it seems on linux JImGui.fromExistingPointer(handle) doesnt crash at startup , i have only 1 window shown, but i receive an error inside the gui.render() function that makes the program crash.
Im using Arch Linux and lwjgl3.

The error is the following

java: /home/ice1000/git-repos/glfw/src/posix_thread.c:64: _glfwPlatformGetTls: assertion "tls->posix.allocated == GLFW_TRUE" failed.

Any idea @ice1000 ?

[videogreg93]

Why was this issue closed? I'm still not able to get this working in LibGDX.

[ice1000]

Why was this issue closed? I'm still not able to get this working in LibGDX.

Me neither