copyFrame
Copy the rendered frame to another SwapChain at a specified viewport.
Call after render() but before endFrame(). This is useful for rendering to multiple displays or for implementing picture-in-picture functionality.
Parameters
dstSwapChain
Destination SwapChain.
dstViewport
Destination viewport rectangle.
srcViewport
Source viewport rectangle.
flags
Behavior flags (COMMIT, SET_PRESENTATION_TIME, CLEAR).