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renderer: internal support for blend modes

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a dinosaur
2024-09-10 10:36:00 +10:00
parent f8a80c6b38
commit 667201fe49
5 changed files with 227 additions and 26 deletions
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23
Sources/Voxelotl/Renderer/BlendMode.swift Normal file
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public enum BlendMode: Hashable {
case none
case normal
case premultiplied
case additive
case screen
case multiply
case subtract
}
internal extension BlendMode {
var function: BlendFunc {
switch self {
case .none: .off
case .normal: .on(src: .srcAlpha, dst: .oneMinusSrcAlpha, equation: .add)
case .premultiplied: .on(src: .one, dst: .oneMinusSrcAlpha, equation: .add)
case .additive: .on(src: .srcAlpha, dst: .one, equation: .add)
case .screen: .on(src: .one, dst: .oneMinusSrcColor, equation: .add)
case .multiply: .on(src: .dstColor, dst: .one, equation: .add)
case .subtract: .on(src: .oneMinusSrcAlpha, dst: .one, equation: .subtract)
}
}
}