is it possible initialize v3d_view in GLFW（a lightweight utility library for use with OpenGL）?

haidong ma
Mon, 12/03/2018 - 13:44

Forums:

I checked the sample codes , it initialize view from MFC, IOS, QT.
But no sample code for simple GLFW.

The benefit from GLFW is that it is light and platform independent .

Kirill Gavrilov
Mon, 12/03/2018 - 16:44

Thank you for your suggestion - if you would like to improve or extend OCCT with new samples, your patches are welcome!
https://dev.opencascade.org/index.php?q=home/get_involved

The main purpose of existing samples is providing new users some guideline for using OCCT in real applications,
so that user interface provided by toolkits like MFC/Qt/WinForms is the essential part of the sample.

At the same time, GLFW is nothing similar - it is a library for managing native windows holding an OpenGL context.
So that a sample based on GLFW can be helpful for demonstrating usage of OCCT 3D Viewer, but not other parts (without inventing a wheel).
It will be also not very helpful for embedding and managing OCCT 3D Viewer into GUI framework, because each framework has its own specifics.

haidong ma
Mon, 12/03/2018 - 17:51

So it is possible to manage OCCT 3D Viewer into GLFW, right?
I will try for sure. But I am not sure I can figure it out.

Kirill Gavrilov
Mon, 12/03/2018 - 19:15

Indeed, Open CASCADE experts have experience embedding OCCT 3D Viewer with many frameworks, and so far I don't see a reason GLFW to be off this list.
Some combinations are much simpler, while others might require expertize in OpenGL.

Damiano Modolo
Tue, 12/04/2018 - 12:13

Yes, is possible. Time ago I'd try occ + glfw + imgui for learning poupose.

If you want i can share it.

haidong ma
Tue, 12/04/2018 - 12:28

Hi, Damiano
"occ + glfw + imgui " is exactly what I looking for !
I will really appreciate your sharing.

I tried QT as gui framework first, but then I thought QT is too heavy for me. This is where this question came from.

Thanks again.

Damiano Modolo
Tue, 12/04/2018 - 12:48

Ok i upload a project. Now i have no time to create a real sample. I hope someone can help in this.

Is uncomment but is easy to understand.

Attachments:

occglfw.zip

haidong ma
Tue, 12/04/2018 - 13:16

thanks!

haidong ma
Sat, 12/29/2018 - 08:55

I figure something out :)

A very simple demo inspired by Damiano Modolo 's code

crossplatform: win10 apple ubuntu


		m_GLcontext = new OpenGl_Context();
#if defined (__APPLE__)
		if (m_GLcontext->Init((NSOpenGLContext*)glfwGetNSGLContext(window)))
			fprintf(stderr, "opengl_context init success\n");
		m_view = m_viewer->CreateView();
		Handle(OccWindow) hWnd = new OccWindow(window);
			fprintf(stderr, "cocoa_window init success\n");
		m_view->SetWindow(hWnd, (NSOpenGLContext*)glfwGetNSGLContext(window));
#elif defined (_WIN32)
	    if(m_GLcontext->Init(glfwGetWin32Window(window), GetDC(glfwGetWin32Window(window)), glfwGetWGLContext(window)))
			fprintf(stderr, "opengl_context init success\n");
		m_view = m_viewer->CreateView();
		Handle(OccWindow) hWnd = new OccWindow(window);
			fprintf(stderr, "wnt_window init success %d %d %d %d\n", 
				hWnd->myXLeft,hWnd->myXRight, hWnd->myYTop,hWnd->myYBottom);
		m_view->SetWindow(hWnd,glfwGetWGLContext(window));
#else 
        if(m_GLcontext->Init(glfwGetX11Window(window), glfwGetX11Display(), glfwGetGLXContext(window)))
			fprintf(stderr, "opengl_context init success\n");
		m_view = m_viewer->CreateView();
		Handle(OccWindow) hWnd = new OccWindow(window);
			fprintf(stderr, "x11_window init success %d %d %d %d\n", 
				hWnd->myXLeft,hWnd->myXRight, hWnd->myYTop,hWnd->myYBottom);
		m_view->SetWindow(hWnd,glfwGetGLXContext(window));
#endif

Attachments:

glfw-occt-deomo.zip

haidong ma
Fri, 12/28/2018 - 17:48

I figure it out by myself, now it works on win10 and apple. :) https://github.com/caadxyz/glfw-occt-demo

haidong ma
Fri, 12/28/2018 - 17:37

demo: https://github.com/caadxyz/glfw-occt-demo

crossplatform: win10, apple