<AWT Dev> RFR: 8266079: Lanai: AlphaComposite shows differences on Metal compared to OpenGL

[Alexey Ushakov]

On Wed, 26 May 2021 13:49:24 GMT, Alexey Ushakov <avu at openjdk.org> wrote:

> Set black color for underlying window background to perform correct blending operations in metal with window surface destination

Reimplemented solution using compute shader

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PR: https://git.openjdk.java.net/jdk/pull/4206