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Fix alpha blending for `opacity`. #84

Merged
merged 1 commit into from Nov 20, 2015

Commits on Nov 20, 2015

  1. Fix alpha blending for `opacity`.

    Alpha from a render target was not being correctly transferred to the
    destination. To do this properly it seems that we need
    `glBlendFuncSeparate`.
    
    Additionally, this commit prepares for composite batching by eliminating
    `f32` values from `LowLevelFilterOp` so as to ensure hashability.
    pcwalton committed Nov 20, 2015
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