Make Framebuffer match alpha settings of the parent context #6
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Fixes #5
In p5 1.4.1, WebGL graphics/canvases default to not having an alpha channel to make alpha blending less confusing by default (thanks @SableRaf for finding this!) Previously, p5.Framebuffer would always have an alpha channel, leading to unexpected results in p5 1.4.1.
After this change:
background(255)afterclear(), since the behaviour ofclear()looks different from v1.4.0 to v1.4.1 if you don't also set a background color