[Solved] Get Handle to OpenGL Unity Render Context

Unity Engine
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I was wondering if anyone knows how to get a handle to the opengl unity render context. I need to create a texture in a external application and render it in Unity using Texture2D.CreateExternalTexture(). When I create the texture in my external application I get a texture id of 1, which seems wrong. I’m guessing its because it has its own render context and does not share a texture pool with Unity. I could be totally wrong about this because I’m a bit of a OpenGL noob. If anyone could point me in the right direction it would be greatly appreciated.

2

I was able to grab the handle to the opengl unity render context by using a low-level native plugin and fetching the handle with wglGetCurrentContext(). Unity - Manual: Low-level native plug-in interface

Using GetRenderEventFunc() allowed me to call GL.IssuePluginEvent() directly from the render thread, which in turn allowed me to grab the context handle. I am now able to render my textures externally and then display them in Unity using Texture2D.CreateExternalTexture().

3

If you could show some exact code samples I would really appreciate it

1 Like
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Check this out: https://www.republicofhandball.com/assets, it’s an OpenGL plugin for MacOS and DirectX plugin for Windows, for rendering to an external window. All the sources are provided.