Allow last random seed to be reused

Diffusion-macOS/ContentView.swift

@@ -66,7 +66,8 @@ struct ContentView: View {
     @StateObject var generation = GenerationContext()
 
     func toolbar() -> any View {
-        if case .complete(let prompt, let cgImage, let seed, _) = generation.state, let cgImage = cgImage {
+        if case .complete(let prompt, let cgImage, _, _) = generation.state, let cgImage = cgImage {
+            // TODO: share seed too
             return ShareButtons(image: cgImage, name: prompt)
         } else {
             let prompt = DEFAULT_PROMPT

Diffusion-macOS/ControlsView.swift

@@ -70,6 +70,9 @@ struct ControlsView: View {
     @State private var showGuidanceHelp = false
     @State private var showStepsHelp = false
     @State private var showSeedHelp = false
+    
+    // Reasonable range for the slider
+    let maxSeed: UInt32 = 1000
 
     func updateSafetyCheckerState() {
         mustShowSafetyCheckerDisclaimer = generation.disableSafety && !Settings.shared.safetyCheckerDisclaimerShown
@@ -82,7 +85,7 @@ struct ControlsView: View {
         pipelineLoader?.cancel()
         pipelineState = .downloading(0)
         Task.init {
-            let loader = PipelineLoader(model: model)
+            let loader = PipelineLoader(model: model, maxSeed: maxSeed)
             self.pipelineLoader = loader
             stateSubscriber = loader.statePublisher.sink { state in
                 DispatchQueue.main.async {
@@ -245,7 +248,7 @@ struct ControlsView: View {
                                         
                     DisclosureGroup(isExpanded: $disclosedSeed) {
                         let sliderLabel = generation.seed < 0 ? "Random Seed" : "Seed"
-                        CompactSlider(value: $generation.seed, in: -1...1000, step: 1) {
+                        CompactSlider(value: $generation.seed, in: -1...Double(maxSeed), step: 1) {
                             Text(sliderLabel)
                             Spacer()
                             Text("\(Int(generation.seed))")

Diffusion-macOS/StatusView.swift

@@ -83,6 +83,12 @@ struct StatusView: View {
                 let intervalString = String(format: "Time: %.1fs", interval ?? 0)
                 Text(intervalString)
                 Spacer()
+                if generation.seed != Double(lastSeed) {
+                    Text("Seed: \(lastSeed)")
+                    Button("Set") {
+                        generation.seed = Double(lastSeed)
+                    }
+                }
             }.frame(maxHeight: 25)
         case .failed(let error):
             return errorWithDetails("Generation error", error: error)

Diffusion/Pipeline/Pipeline.swift

@@ -22,6 +22,7 @@ struct GenerationResult {
 
 class Pipeline {
     let pipeline: StableDiffusionPipeline
+    let maxSeed: UInt32
     
     var progress: StableDiffusionProgress? = nil {
         didSet {
@@ -31,8 +32,9 @@ class Pipeline {
     lazy private(set) var progressPublisher: CurrentValueSubject<StableDiffusionProgress?, Never> = CurrentValueSubject(progress)
 
 
-    init(_ pipeline: StableDiffusionPipeline) {
+    init(_ pipeline: StableDiffusionPipeline, maxSeed: UInt32 = UInt32.max) {
         self.pipeline = pipeline
+        self.maxSeed = maxSeed
     }
     
     func generate(
@@ -46,7 +48,7 @@ class Pipeline {
     ) throws -> GenerationResult {
         let beginDate = Date()
         print("Generating...")
-        let theSeed = seed ?? UInt32.random(in: 0..<UInt32.max)
+        let theSeed = seed ?? UInt32.random(in: 0...maxSeed)
         let images = try pipeline.generateImages(
             prompt: prompt,
             negativePrompt: negativePrompt,

Diffusion/Pipeline/PipelineLoader.swift

@@ -18,10 +18,13 @@ class PipelineLoader {
     static let models = Path.applicationSupport / "hf-diffusion-models"
     
     let model: ModelInfo
+    let maxSeed: UInt32
+    
     private var downloadSubscriber: Cancellable?
 
-    init(model: ModelInfo) {
+    init(model: ModelInfo, maxSeed: UInt32 = UInt32.max) {
         self.model = model
+        self.maxSeed = maxSeed
         state = .undetermined
         setInitialState()
     }
@@ -100,7 +103,7 @@ extension PipelineLoader {
             try await download()
             try await unzip()
             let pipeline = try await load(url: compiledPath.url)
-            return Pipeline(pipeline)
+            return Pipeline(pipeline, maxSeed: maxSeed)
         } catch {
             state = .failed(error)
             throw error