ShaderStringBuilder

Examples/ExampleMacOS/ExampleMacOS/Logic/Functions.swift

@@ -12,30 +12,23 @@ class MyCompute1: SCMetalComputeFunction {
     @EMArgument("tex") var tex: SCMetalTexture = .init(texture: nil, usage: .read_write)
     @EMArgument("col") var col: Float = 0
 
-    init() {
-        super.init(
-            functionName: "myCompute1",
-            impl: [
-                "tex.write(float4(col, 0.1, col, 1), gid);"
-            ]
-        )
+    @ShaderStringBuilder
+    override var impl: String {
+        "tex.write(float4(col, 0.1, col, 1), gid);"
     }
 }
 
 class MyRender1: SCMetalRenderFunction {
 
-    init() {
-        super.init(
-            functionName: "myRender1",
-            vertImpl: [
-                "rd.size = 1;",
-                "rd.position = input;",
-                "rd.color = float4(1, 0.6, 0.8, 1);",
-            ],
-            fragImpl: [
-                "return rd.color;"
-            ],
-            targetPixelFormat: .bgra8Unorm
-        )
+    @ShaderStringBuilder
+    override var vertImpl: String {
+        "rd.size = 1;"
+        "rd.position = input;"
+        "rd.color = float4(1, 0.6, 0.8, 1);"
+    }
+
+    @ShaderStringBuilder
+    override var fragImpl: String {
+        "return rd.color;"
     }
 }

Examples/ExampleMacOS/ExampleMacOS/Logic/MyRenderer.swift

@@ -18,7 +18,7 @@ class MyRenderer: ShaderRenderer {
     }()
 
     let compute1 = MyCompute1()
-    let render1 = MyRender1()
+    let render1 = MyRender1(targetPixelFormat: .bgra8Unorm)
 
     override func draw(view: MTKView, drawable: CAMetalDrawable) {
         let dispatch = SCMetalDispatch()

Examples/ExampleiOS/ExampleiOS/Logic/Functions.swift

@@ -12,30 +12,23 @@ class MyCompute1: SCMetalComputeFunction {
     @EMArgument("tex") var tex: SCMetalTexture = .init(texture: nil, usage: .read_write)
     @EMArgument("col") var col: Float = 0
 
-    init() {
-        super.init(
-            functionName: "myCompute1",
-            impl: [
-                "tex.write(float4(col, 0.1, col, 1), gid);"
-            ]
-        )
+    @ShaderStringBuilder
+    override var impl: String {
+        "tex.write(float4(col, 0.1, col, 1), gid);"
     }
 }
 
 class MyRender1: SCMetalRenderFunction {
 
-    init() {
-        super.init(
-            functionName: "myRender1",
-            vertImpl: [
-                "rd.size = 1;",
-                "rd.position = input;",
-                "rd.color = float4(1, 0.6, 0.8, 1);",
-            ],
-            fragImpl: [
-                "return rd.color;"
-            ],
-            targetPixelFormat: .bgra8Unorm
-        )
+    @ShaderStringBuilder
+    override var vertImpl: String {
+        "rd.size = 1;"
+        "rd.position = input;"
+        "rd.color = float4(1, 0.6, 0.8, 1);"
+    }
+
+    @ShaderStringBuilder
+    override var fragImpl: String {
+        "return rd.color;"
     }
 }

Examples/ExampleiOS/ExampleiOS/Logic/MyRenderer.swift

@@ -18,7 +18,7 @@ class MyRenderer: ShaderRenderer {
     }()
 
     let compute1 = MyCompute1()
-    let render1 = MyRender1()
+    let render1 = MyRender1(targetPixelFormat: .bgra8Unorm)
 
     override func draw(view: MTKView, drawable: CAMetalDrawable) {
         let dispatch = SCMetalDispatch()

Package.swift

@@ -1,4 +1,4 @@
-// swift-tools-version: 5.7
+// swift-tools-version: 5.8
 // The swift-tools-version declares the minimum version of Swift required to build this package.
 
 import PackageDescription

Sources/EasyMetalShader/Builder/ShaderStringBuilder.swift

@@ -0,0 +1,30 @@
+//
+//  File.swift
+//  
+//
+//  Created by Yuki Kuwashima on 2024/01/09.
+//
+
+import Foundation
+
+@resultBuilder
+public struct ShaderStringBuilder {
+    public static func buildBlock(_ component: String) -> String{
+        component
+    }
+    public static func buildBlock(_ components: String...) -> String {
+        components.joined()
+    }
+    public static func buildBlock(_ components: [String]) -> String {
+        components.joined()
+    }
+    public static func buildBlock(_ components: [String], _ components2: [String]) -> String {
+        components.joined() + components2.joined()
+    }
+    public static func buildArray(_ components: [String]) -> String {
+        components.joined()
+    }
+    public static func buildArray(_ components: [[String]]) -> String {
+        components.joined().joined()
+    }
+}

Sources/EasyMetalShader/Pipelines/SCMetalComputeFunction.swift

@@ -17,15 +17,21 @@ open class SCMetalComputeFunction: NSObject, SCMetalFunction {
 
     public var args: [String: SCMetalArgument] = [:]
 
-    public init(functionName: String, impl: [String]) {
-
+    @ShaderStringBuilder 
+    open var impl: String {
+        ""
+    }
+
+    public override init() {
         super.init()
 
         MirrorUtil.setInitialValue(for: self)
 
+        let tempFunctionName = "f" + UUID().uuidString.lowercased().replacingOccurrences(of: "-", with: "")
+
         var functionImpl = ""
         functionImpl += Self.initialMetalHeader
-        functionImpl += "kernel void \(functionName)("
+        functionImpl += "kernel void \(tempFunctionName)("
 
         for (i, key) in args.keys.enumerated() {
             switch args[key] {
@@ -91,7 +97,7 @@ open class SCMetalComputeFunction: NSObject, SCMetalFunction {
             }
         }
 
-        functionImpl += impl.joined()
+        functionImpl += impl
         functionImpl += "}"
 
         let library = try! ShaderCore.device.makeLibrary(
@@ -100,7 +106,7 @@ open class SCMetalComputeFunction: NSObject, SCMetalFunction {
         )
         self.computePipelineState = try! ShaderCore.device.makeComputePipelineState(
             function: library.makeFunction(
-                name: functionName
+                name: tempFunctionName
             )!
         )
     }

Sources/EasyMetalShader/Pipelines/SCMetalRenderFunction.swift

@@ -10,6 +10,7 @@ import simd
 
 @objcMembers
 open class SCMetalRenderFunction: NSObject, SCMetalFunction {
+
     private static let initialMetalHeader = MetalPreLibrary.include + MetalPreLibrary.rand + MetalPreLibrary.svd + MetalPreLibrary.rasterizerData
 
     public var args: [String: SCMetalArgument] = [:]
@@ -19,17 +20,21 @@ open class SCMetalRenderFunction: NSObject, SCMetalFunction {
     var renderTargetTexture: MTLTexture!
     var needsClear: Bool = false
 
-    public init(functionName: String, vertImpl: [String], fragImpl: [String], targetPixelFormat: MTLPixelFormat) {
-
+    @ShaderStringBuilder open var vertImpl: String { "" }
+    @ShaderStringBuilder open var fragImpl: String { "" }
+
+    public init(targetPixelFormat: MTLPixelFormat) {
         super.init()
 
         MirrorUtil.setInitialValue(for: self)
 
+        let tempFunctionName = "f" + UUID().uuidString.lowercased().replacingOccurrences(of: "-", with: "")
+
         var functionImpl = ""
         functionImpl += Self.initialMetalHeader
 
         //vertex
-        functionImpl += "vertex RasterizerData \(functionName)_vert("
+        functionImpl += "vertex RasterizerData \(tempFunctionName)_vert("
 
         for (i, key) in args.keys.enumerated() {
             switch args[key] {
@@ -96,12 +101,12 @@ open class SCMetalRenderFunction: NSObject, SCMetalFunction {
             }
         }
 
-        functionImpl += vertImpl.joined()
+        functionImpl += vertImpl
         functionImpl += "return rd;"
         functionImpl += "}"
 
         //fragment
-        functionImpl += "fragment float4 \(functionName)_frag("
+        functionImpl += "fragment float4 \(tempFunctionName)_frag("
 
         for (i, key) in args.keys.enumerated() {
             switch args[key] {
@@ -169,7 +174,7 @@ open class SCMetalRenderFunction: NSObject, SCMetalFunction {
             }
         }
 
-        functionImpl += fragImpl.joined()
+        functionImpl += fragImpl
         functionImpl += "}"
 
 
@@ -178,8 +183,8 @@ open class SCMetalRenderFunction: NSObject, SCMetalFunction {
             options: nil
         )
         let descriptor = MTLRenderPipelineDescriptor()
-        descriptor.vertexFunction = library.makeFunction(name: functionName + "_vert")
-        descriptor.fragmentFunction = library.makeFunction(name: functionName + "_frag")
+        descriptor.vertexFunction = library.makeFunction(name: tempFunctionName + "_vert")
+        descriptor.fragmentFunction = library.makeFunction(name: tempFunctionName + "_frag")
 
         let vertexDesc = MTLVertexDescriptor()
         vertexDesc.attributes[0].format = .float4