cyan lily
I need to write a plugin where it will do screen capture and I will end up with a BYTE* of RGB bits, and I need to stuff them into a hardware texture buffer on the local PC. I need the ability to lock that texture buffer while writing the bits, and to unlock it when I'm done. it would be ideal if I could do a GPU-memory copy from an existing hardware texture to Godot's hardware texture.
any examples of this already around?
impossible?
This should happen at 72FPS, full screen res.
winged galleon
Anything GPU related is trough shaders ofc.
Would Compute Shaders help with this? The docs have a tutorial on it
cyan lily
The code that gets the bits into a CPU-RAM buffer, is in C++. So I'm pretty sure I need a GDExtension written for godot-cpp. In the extension, I'm guessing here, but I think i need a method that gets passed in a Texture2D. I need to know in advance that texture is natively a DX12 (or DX11) texture (not Vulkan) and then I need to be able to get to its native pointer. Can I do that? Once I can do that, I can GPU-GPU copy blit to it. I don't know if I need to be on a specific thread, main thread, or render thread, in order for this to work right.
elsewhere in the program, this Texture2D is assigned to a material/shader that is set upon a mesh that is in the scene. The ultimate goal is to put a screen-scraped desktop's contents into Godot onto a mesh that is out in 3D space.
I wouldn't think a compute shader is the exact right solution for this.
I'm looking for any example (godot-cpp) (GDExtension) that fills a Texture2D in a c++ extension and Godot uses that texture, live, in the scene.