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Redo swapchain with ImageBitmap #285

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Redo swapchain with ImageBitmap #285

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37 changes: 27 additions & 10 deletions spec/index.bs
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Original file line number Diff line number Diff line change
Expand Up @@ -736,22 +736,34 @@ Canvas Rendering and Swap Chain {#swapchain}
============================================

<script type=idl>
interface GPUCanvasContext {
// Calling configureSwapChain a second time invalidates the previous one,
// and all of the textures it’s produced.
GPUSwapChain configureSwapChain(GPUSwapChainDescriptor descriptor);

Promise<GPUTextureFormat> getSwapChainPreferredFormat(GPUDevice device);
}

dictionary GPUSwapChainDescriptor {
required GPUDevice device;
required ImageBitmapRenderingContext context;
required GPUTextureFormat format;
GPUTextureUsageFlags usage = GPUTextureUsage.OUTPUT_ATTACHMENT;
};

interface GPUSwapChain {
GPUTexture getCurrentTexture();
// Returns a new GPUTexture representing the next image in the swapchain.
//
// Sets the "has active swapchain image" flag.
// Throws an exception if the active was already set.
GPUTexture getNextTexture();

// Transfers the swapchain texture to an ImageBitmap. The GPUTexture
// becomes invalid. Throws an exception if the texture is not from this
// swapchain, or if it is invalid.
ImageBitmap transferToImageBitmap(GPUTexture texture);

// To present the ImageBitmap, use transferFromImageBitmap on the
// ImageBitmapRenderingContext that this GPUSwapChain was created from.
//
// Doing so closes the ImageBitmap, and unsets the "has active swapchain
// image" flag on the GPUSwapChain.

// Example:
// const texture = swapchain.getNextTexture();
// renderInto(texture);
// ibrc.transferFromImageBitmap(swapchain.transferToImageBitmap(texture));
};
</script>

Expand Down Expand Up @@ -790,6 +802,11 @@ interface GPUDevice {
GPUCommandEncoder createCommandEncoder(GPUCommandEncoderDescriptor descriptor);

GPUQueue getQueue();

// Calling configureSwapChain a second time invalidates/detaches the
// previous GPUSwapChain, and all of the swapchain images it has produced.
GPUSwapChain configureSwapChain(GPUSwapChainDescriptor descriptor);
Promise<GPUTextureFormat> getSwapChainPreferredFormat(ImageBitmapRenderingContext context);
};

dictionary GPUDeviceDescriptor {
Expand Down