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minjaesong
2022-04-20 18:36:26 +09:00
parent 82c5d75b26
commit 6650861ad6
1 changed files with 2 additions and 2 deletions
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tsvm_core/src/net/torvald/tsvm/peripheral/GraphicsAdapter.kt
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@@ -782,8 +782,8 @@ open class GraphicsAdapter(private val assetsRoot: String, val vm: VM, val confi
// manually alpha compositing
// out_color = {src_color * src_alpha + dest_color * dest_alpha * (1-src_alpha)} / out_alpha
// see https://gamedev.stackexchange.com/a/115786
val outAlpha = (1f - (1f - dest.a) * (1f - src.a)).coerceIn(0.0001f, 1f)
val outAlpha = (dest.a + (1f - dest.a) * src.a).coerceIn(0.0001f, 1f) // identical to 1 - (1 - dest.a) * (1 - src.a) but this is more optimised form
// src.a + dest.a - src.a*dest.a)
Color(
(src.r * src.a + dest.r * dest.a * (1f - src.a)) / outAlpha,