Add handlers for touch events (iOS)

Sources/EasyMetalShader/MetalPreLibrary/VertexInput.swift

@@ -64,4 +64,18 @@ public struct VertexInput {
         self.input8 = input8
         self.input9 = input9
     }
+
+    public init(
+        input0: simd_float4,
+        input1: simd_float4
+    ) {
+        self.input0 = input0
+        self.input1 = input1
+    }
+
+    public init(
+        input0: simd_float4
+    ) {
+        self.input0 = input0
+    }
 }

Sources/EasyMetalShader/Pipelines/ShaderRenderer.swift

@@ -24,4 +24,12 @@ open class ShaderRenderer: NSObject, MTKViewDelegate {
     }
 
     open func draw(view: MTKView, drawable: CAMetalDrawable) {}
+
+    #if os(iOS)
+    open func touchesBegan(_ touches: Set<UITouch>, with event: UIEvent?, view: UIView?) {}
+    open func touchesMoved(_ touches: Set<UITouch>, with event: UIEvent?, view: UIView?) {}
+    open func touchesEnded(_ touches: Set<UITouch>, with event: UIEvent?, view: UIView?) {}
+    open func touchesCancelled(_ touches: Set<UITouch>, with event: UIEvent?, view: UIView?) {}
+    open func onScroll(recognizer: UIPanGestureRecognizer?, view: UIView?) {}
+    #endif
 }

Sources/EasyMetalShader/Views/ShaderMTKView.swift

@@ -34,6 +34,12 @@ public class ShaderMTKView: MTKView {
         self.sampleCount = 1
         self.clearDepth = 1.0
 
+        #if os(macOS)
+        self.layer?.isOpaque = false
+        #elseif os(iOS)
+        self.layer.isOpaque = false
+        #endif
+
         #if os(macOS)
         let options: NSTrackingArea.Options = [
             .mouseMoved,
@@ -43,12 +49,30 @@ public class ShaderMTKView: MTKView {
         let trackingArea = NSTrackingArea(rect: bounds, options: options, owner: self, userInfo: nil)
         self.addTrackingArea(trackingArea)
         #endif
+
+        #if os(iOS)
+        let scrollGestureRecognizer = UIPanGestureRecognizer(target: self, action: #selector(onScroll))
+        scrollGestureRecognizer.allowedScrollTypesMask = .continuous
+        scrollGestureRecognizer.minimumNumberOfTouches = 2
+        scrollGestureRecognizer.maximumNumberOfTouches = 2
+        self.addGestureRecognizer(scrollGestureRecognizer)
+        #endif
     }
 
     required init(coder: NSCoder) {
         fatalError("init(coder:) has not been implemented")
     }
 
+    deinit {
+        #if os(iOS)
+        if let recognizers = self.gestureRecognizers {
+            for recognizer in recognizers {
+                self.removeGestureRecognizer(recognizer)
+            }
+        }
+        #endif
+    }
+
     #if os(macOS)
     public override func mouseDragged(with event: NSEvent) {
         let mousePos = mousePos(event: event, viewFrame: self.superview!.frame)
@@ -64,4 +88,22 @@ public class ShaderMTKView: MTKView {
         return simd_float2(Float(location.x), Float(location.y))
     }
     #endif
+
+    #if os(iOS)
+    public override func touchesBegan(_ touches: Set<UITouch>, with event: UIEvent?) {
+        renderer.touchesBegan(touches, with: event, view: self)
+    }
+    public override func touchesMoved(_ touches: Set<UITouch>, with event: UIEvent?) {
+        renderer.touchesMoved(touches, with: event, view: self)
+    }
+    public override func touchesEnded(_ touches: Set<UITouch>, with event: UIEvent?) {
+        renderer.touchesEnded(touches, with: event, view: self)
+    }
+    public override func touchesCancelled(_ touches: Set<UITouch>, with event: UIEvent?) {
+        renderer.touchesCancelled(touches, with: event, view: self)
+    }
+    @objc func onScroll(recognizer: UIPanGestureRecognizer) {
+        renderer.onScroll(recognizer: recognizer, view: self)
+    }
+    #endif
 }