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[ios] Fix blending, see #2555

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This commit is contained in:
Mario Zechner 2024-06-28 15:39:13 +02:00
parent 35d76de559
commit 7d6f0f9490
1 changed files with 70 additions and 35 deletions
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61
spine-ios/Sources/Spine/Metal/SpineRenderer.swift
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@ -283,21 +283,13 @@ internal final class SpineRenderer: NSObject, MTKViewDelegate {
}
}
fileprivate extension MTLRenderPipelineColorAttachmentDescriptor {
func apply(blendMode: BlendMode, with premultipliedAlpha: Bool) {
isBlendingEnabled = true
sourceRGBBlendFactor = blendMode.sourceRGBBlendFactor(premultipliedAlpha: premultipliedAlpha)
destinationRGBBlendFactor = blendMode.destinationRGBBlendFactor
destinationAlphaBlendFactor = .oneMinusSourceAlpha
}
}
fileprivate extension BlendMode {
func sourceRGBBlendFactor(premultipliedAlpha: Bool) -> MTLBlendFactor {
switch self {
case SPINE_BLEND_MODE_NORMAL, SPINE_BLEND_MODE_ADDITIVE:
case SPINE_BLEND_MODE_NORMAL:
return premultipliedAlpha ? .one : .sourceAlpha
case SPINE_BLEND_MODE_ADDITIVE:
return .sourceAlpha
case SPINE_BLEND_MODE_MULTIPLY:
return .destinationColor
case SPINE_BLEND_MODE_SCREEN:
@ -307,12 +299,44 @@ fileprivate extension BlendMode {
}
}
func sourceAlphaBlendFactor(premultipliedAlpha: Bool) -> MTLBlendFactor {
switch self {
case SPINE_BLEND_MODE_NORMAL:
return premultipliedAlpha ? .one : .sourceAlpha
case SPINE_BLEND_MODE_ADDITIVE:
return .sourceAlpha
case SPINE_BLEND_MODE_MULTIPLY:
return .oneMinusSourceAlpha
case SPINE_BLEND_MODE_SCREEN:
return .oneMinusSourceColor
default:
return .one // Should never be called
}
}
var destinationRGBBlendFactor: MTLBlendFactor {
switch self {
case SPINE_BLEND_MODE_NORMAL, SPINE_BLEND_MODE_ADDITIVE:
case SPINE_BLEND_MODE_NORMAL:
return .oneMinusSourceAlpha
case SPINE_BLEND_MODE_MULTIPLY:
case SPINE_BLEND_MODE_ADDITIVE:
return .one
case SPINE_BLEND_MODE_MULTIPLY:
return .oneMinusSourceAlpha
case SPINE_BLEND_MODE_SCREEN:
return .oneMinusSourceColor
default:
return .one // Should never be called
}
}
var destinationAlphaBlendFactor: MTLBlendFactor {
switch self {
case SPINE_BLEND_MODE_NORMAL:
return .oneMinusSourceAlpha
case SPINE_BLEND_MODE_ADDITIVE:
return .one
case SPINE_BLEND_MODE_MULTIPLY:
return .oneMinusSourceAlpha
case SPINE_BLEND_MODE_SCREEN:
return .oneMinusSourceColor
default:
@ -320,3 +344,14 @@ fileprivate extension BlendMode {
}
}
}
fileprivate extension MTLRenderPipelineColorAttachmentDescriptor {
func apply(blendMode: BlendMode, with premultipliedAlpha: Bool) {
isBlendingEnabled = true
sourceRGBBlendFactor = blendMode.sourceRGBBlendFactor(premultipliedAlpha: premultipliedAlpha)
sourceAlphaBlendFactor = blendMode.sourceAlphaBlendFactor(premultipliedAlpha: premultipliedAlpha)
destinationRGBBlendFactor = blendMode.destinationRGBBlendFactor
destinationAlphaBlendFactor = blendMode.destinationAlphaBlendFactor
}
}