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Showing content from https://developers.google.com/vr/reference/android/com/google/vr/ndk/base/SwapChain below:

SwapChain | Google VR | Google for Developers

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Swap chain that contains some number of frames. Frames in the swap chain can be unused, in the process of being distorted and presented on the screen, or acquired and being rendered to by the application. The swap chain ensures that the most recent available frame is always shown and that the application never has to wait to render the next frame.

()

Gets the number of buffers in each frame of the swap chain.

(int bufferIndex,

sizeOut)

Retrieves the size of the specified pixel buffer.

(int bufferIndex,

newSize)

Resizes the specified pixel buffer to the given size.

getClass()

hashCode()

notify()

notifyAll()

toString()

wait(long arg0, int arg1)

wait(long arg0)

wait()

Acquires a Frame from the swap chain for rendering.

Buffers that are part of the frame can then be bound with bindBuffer(int). Once the frame is finished and all its constituent buffers are ready, call submit(BufferViewportList, float[]) to display it while applying lens distortion.

Note: If frame submission is asynchronous, e.g., when async reprojection is enabled, it's possible that no free frames will be available for acquisition. Under such circumstances, this method will fail and return null. The client should re-attempt acquisition after a reasonable delay, e.g., several milliseconds.

Note: Please make sure that the GL context from initializeGl() is current when this method is called, or that it lives in a share group with the initialization context.

• Handle to the acquired frame. null if no frames are available.

Gets the number of buffers in each frame of the swap chain.

Retrieves the size of the specified pixel buffer.

Note: If the buffer was resized while the current frame was acquired, the return value will be different than the value obtained from the equivalent function for the current frame.

Resizes the specified pixel buffer to the given size.

The frames are resized when they are unused, so the currently acquired frame will not be resized immediately.

Destroys the swap chain. The SwapChain instance should not be used after this call.

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Last updated 2024-10-09 UTC.

[[["Easy to understand","easyToUnderstand","thumb-up"],["Solved my problem","solvedMyProblem","thumb-up"],["Other","otherUp","thumb-up"]],[["Missing the information I need","missingTheInformationINeed","thumb-down"],["Too complicated / too many steps","tooComplicatedTooManySteps","thumb-down"],["Out of date","outOfDate","thumb-down"],["Samples / code issue","samplesCodeIssue","thumb-down"],["Other","otherDown","thumb-down"]],["Last updated 2024-10-09 UTC."],[[["`SwapChain` manages frames for VR rendering, ensuring smooth transitions and minimizing wait times for the application."],["It provides methods to acquire, resize, and submit frames for display, along with managing buffer sizes."],["`acquireFrame()` can return null if no frames are readily available, especially with asynchronous reprojection enabled."],["`resizeBuffer()` changes the size of the buffer in the swapchain, affecting subsequently acquired frames but not the currently used one."],["Developers must call `shutdown()` to destroy the `SwapChain` instance before discarding it, preventing resource leaks."]]],["The `SwapChain` class manages frames for rendering, ensuring the latest frame is displayed without application wait times. Key actions include: `acquireFrame()` to get a frame for rendering, potentially returning null if no frames are free; `getBufferCount()` to check the number of buffers; `getBufferSize()` to retrieve a buffer's size; and `resizeBuffer()` to change a buffer's dimensions. Finally, `shutdown()` destroys the swap chain, after which the instance shouldn't be used.\n"]]

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