Method ConfigGrabDepth

vgpu/render.go:319–330

https://www.reddit.com/r/vulkan/comments/7yhvep/retrieve_depth_attachment_from_framebuffer/ https://pastebin.com/33MxSNmh have to copy to a buffer then sync that back down create the buffer as the GrabDepth item ConfigGrabDepth configures the GrabDepth for copying depth image back to host memory. U

(dev vk.Device)

// ConfigGrabDepth configures the GrabDepth for copying depth image
// back to host memory.  Uses format of current Depth image.
func (rp *Render) ConfigGrabDepth(dev vk.Device) {
	bsz := rp.Format.Size.X * rp.Format.Size.Y * 4 // 32 bit = 4 bytes per pixel
	if rp.GrabDepth.Active {
		if rp.GrabDepth.Size == bsz {
			return
		}
		rp.GrabDepth.Free(dev)
	}
	rp.GrabDepth.GPU = rp.Sys.GPU
	rp.GrabDepth.Type = StorageBuff
	rp.GrabDepth.AllocHost(dev, bsz)
}

// GrabDepthImage grabs the current render depth image, using given command buffer
// which must have the cmdBegin called already.  Uses the GrabDepth Storage Buffer.