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[iOS] fix additive, normal blending (#2822)

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Byeong Gwan 2025-05-05 18:57:51 +09:00 committed by GitHub
parent ae8c4792ba
commit 123426d3e3
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GPG Key ID: B5690EEEBB952194
1 changed files with 7 additions and 5 deletions
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12
spine-ios/Sources/Spine/Metal/SpineRenderer.swift
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@ -294,7 +294,8 @@ fileprivate extension BlendMode {
case SPINE_BLEND_MODE_NORMAL: case SPINE_BLEND_MODE_NORMAL:
return premultipliedAlpha ? .one : .sourceAlpha return premultipliedAlpha ? .one : .sourceAlpha
case SPINE_BLEND_MODE_ADDITIVE: case SPINE_BLEND_MODE_ADDITIVE:
return .sourceAlpha // additvie only needs sourceAlpha multiply if it is not pma
return premultipliedAlpha ? .one : .sourceAlpha
case SPINE_BLEND_MODE_MULTIPLY: case SPINE_BLEND_MODE_MULTIPLY:
return .destinationColor return .destinationColor
case SPINE_BLEND_MODE_SCREEN: case SPINE_BLEND_MODE_SCREEN:
@ -304,12 +305,13 @@ fileprivate extension BlendMode {
} }
} }
func sourceAlphaBlendFactor(premultipliedAlpha: Bool) -> MTLBlendFactor { var sourceAlphaBlendFactor: MTLBlendFactor {
// pma and non-pma has no-relation ship with alpha blending
switch self { switch self {
case SPINE_BLEND_MODE_NORMAL: case SPINE_BLEND_MODE_NORMAL:
return premultipliedAlpha ? .one : .sourceAlpha return .one
case SPINE_BLEND_MODE_ADDITIVE: case SPINE_BLEND_MODE_ADDITIVE:
return .sourceAlpha return .one
case SPINE_BLEND_MODE_MULTIPLY: case SPINE_BLEND_MODE_MULTIPLY:
return .oneMinusSourceAlpha return .oneMinusSourceAlpha
case SPINE_BLEND_MODE_SCREEN: case SPINE_BLEND_MODE_SCREEN:
@ -355,7 +357,7 @@ fileprivate extension MTLRenderPipelineColorAttachmentDescriptor {
func apply(blendMode: BlendMode, with premultipliedAlpha: Bool) { func apply(blendMode: BlendMode, with premultipliedAlpha: Bool) {
isBlendingEnabled = true isBlendingEnabled = true
sourceRGBBlendFactor = blendMode.sourceRGBBlendFactor(premultipliedAlpha: premultipliedAlpha) sourceRGBBlendFactor = blendMode.sourceRGBBlendFactor(premultipliedAlpha: premultipliedAlpha)
sourceAlphaBlendFactor = blendMode.sourceAlphaBlendFactor(premultipliedAlpha: premultipliedAlpha) sourceAlphaBlendFactor = blendMode.sourceAlphaBlendFactor
destinationRGBBlendFactor = blendMode.destinationRGBBlendFactor destinationRGBBlendFactor = blendMode.destinationRGBBlendFactor
destinationAlphaBlendFactor = blendMode.destinationAlphaBlendFactor destinationAlphaBlendFactor = blendMode.destinationAlphaBlendFactor
} }