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It's actually not possible to accurately composite subpixel AA using the GPU since you can't configure blends per-channel. To do it accurately, you need three d
by Jasper_ 9y ago
It's actually not possible to accurately composite subpixel AA using the GPU since you can't configure blends per-channel. To do it accurately, you need three different alpha channels.
- hrydgard 9y agoIt is actually possible to do using a feature called dual source blending, which unfortunately is so rarely used that drivers tend to fail to implement it properly. But it does give you the possibility to use 3+ alpha channels with full hardware acceleration, at some memory cost. Though since DPIs are going up and 3 alpha channels is such an unusual thing, I guess they just figured it wasn't worth the trouble.