BlendMode
Determines how pixels should be blended. The most common blend modes are: NORMAL (normal mix) and ADD (additive blending) along with MULTIPLY and others.
https://developer.mozilla.org/en-US/docs/Web/API/WebGLRenderingContext/blendFuncSeparate
// color(RGB) = (sourceColor * srcRGB) + (destinationColor * dstRGB)
// color(A) = (sourceAlpha * srcAlpha) + (destinationAlpha * dstAlpha)
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