Enable Sharpen operation, update README. (BradLarson#135)

BradLarson · web-flow · commit 84466fc344e1 · 2024-02-18T19:05:24.000-06:00
diff --git a/README.md b/README.md
diff --git a/Sources/GPUImage/Operations/AddBlend.metal b/Sources/GPUImage/Operations/AddBlend.metal
@@ -9,7 +9,7 @@ fragment half4 addBlendFragment(TwoInputVertexIO fragmentInput [[stage_in]],
     constexpr sampler quadSampler;
     half4 base = inputTexture.sample(quadSampler, fragmentInput.textureCoordinate);
     constexpr sampler quadSampler2;
-    half4 overlay = inputTexture2.sample(quadSampler, fragmentInput.textureCoordinate2);
+    half4 overlay = inputTexture2.sample(quadSampler2, fragmentInput.textureCoordinate2);
     
     half r;
     if (overlay.r * base.a + base.r * overlay.a >= overlay.a * base.a) {
diff --git a/Sources/GPUImage/Operations/AlphaBlend.metal b/Sources/GPUImage/Operations/AlphaBlend.metal
@@ -15,7 +15,7 @@ fragment half4 alphaBlendFragment(TwoInputVertexIO fragmentInput [[stage_in]],
     constexpr sampler quadSampler;
     half4 textureColor = inputTexture.sample(quadSampler, fragmentInput.textureCoordinate);
     constexpr sampler quadSampler2;
-    half4 textureColor2 = inputTexture2.sample(quadSampler, fragmentInput.textureCoordinate2);
+    half4 textureColor2 = inputTexture2.sample(quadSampler2, fragmentInput.textureCoordinate2);
     
     return half4(mix(textureColor.rgb, textureColor2.rgb, textureColor2.a * half(uniform.mixturePercent)), textureColor.a);
 }
diff --git a/Sources/GPUImage/Operations/ChromaKeyBlend.metal b/Sources/GPUImage/Operations/ChromaKeyBlend.metal
@@ -18,7 +18,7 @@ fragment half4 chromaKeyBlendFragment(TwoInputVertexIO fragmentInput [[stage_in]
     constexpr sampler quadSampler;
     half4 textureColor = inputTexture.sample(quadSampler, fragmentInput.textureCoordinate);
     constexpr sampler quadSampler2;
-    half4 textureColor2 = inputTexture2.sample(quadSampler, fragmentInput.textureCoordinate2);
+    half4 textureColor2 = inputTexture2.sample(quadSampler2, fragmentInput.textureCoordinate2);
     
     half maskY = 0.2989h * uniform.colorToReplace.r + 0.5866h * uniform.colorToReplace.g + 0.1145h * uniform.colorToReplace.b;
     half maskCr = 0.7132h * (uniform.colorToReplace.r - maskY);
diff --git a/Sources/GPUImage/Operations/ColorBlend.metal b/Sources/GPUImage/Operations/ColorBlend.metal
@@ -10,7 +10,7 @@ fragment half4 colorBlendFragment(TwoInputVertexIO fragmentInput [[stage_in]],
     constexpr sampler quadSampler;
     half4 base = inputTexture.sample(quadSampler, fragmentInput.textureCoordinate);
     constexpr sampler quadSampler2;
-    half4 overlay = inputTexture2.sample(quadSampler, fragmentInput.textureCoordinate2);
+    half4 overlay = inputTexture2.sample(quadSampler2, fragmentInput.textureCoordinate2);
     
     return half4(base.rgb * (1.0h - overlay.a) + setlum(overlay.rgb, lum(base.rgb)) * overlay.a, base.a);
 }
diff --git a/Sources/GPUImage/Operations/ColorBurnBlend.metal b/Sources/GPUImage/Operations/ColorBurnBlend.metal
@@ -9,7 +9,7 @@ fragment half4 colorBurnBlendFragment(TwoInputVertexIO fragmentInput [[stage_in]
     constexpr sampler quadSampler;
     half4 textureColor = inputTexture.sample(quadSampler, fragmentInput.textureCoordinate);
     constexpr sampler quadSampler2;
-    half4 textureColor2 = inputTexture2.sample(quadSampler, fragmentInput.textureCoordinate2);
+    half4 textureColor2 = inputTexture2.sample(quadSampler2, fragmentInput.textureCoordinate2);
     half4 whiteColor = half4(1.0);
     
     return whiteColor - (whiteColor - textureColor) / textureColor2;
diff --git a/Sources/GPUImage/Operations/ColorDodgeBlend.metal b/Sources/GPUImage/Operations/ColorDodgeBlend.metal
@@ -9,7 +9,7 @@ fragment half4 colorDodgeBlendFragment(TwoInputVertexIO fragmentInput [[stage_in
     constexpr sampler quadSampler;
     half4 base = inputTexture.sample(quadSampler, fragmentInput.textureCoordinate);
     constexpr sampler quadSampler2;
-    half4 overlay = inputTexture2.sample(quadSampler, fragmentInput.textureCoordinate2);
+    half4 overlay = inputTexture2.sample(quadSampler2, fragmentInput.textureCoordinate2);
     
     half3 baseOverlayAlphaProduct = half3(overlay.a * base.a);
     half3 rightHandProduct = overlay.rgb * (1.0h - base.a) + base.rgb * (1.0h - overlay.a);
diff --git a/Sources/GPUImage/Operations/DarkenBlend.metal b/Sources/GPUImage/Operations/DarkenBlend.metal
@@ -9,7 +9,7 @@ fragment half4 darkenBlendFragment(TwoInputVertexIO fragmentInput [[stage_in]],
     constexpr sampler quadSampler;
     half4 base = inputTexture.sample(quadSampler, fragmentInput.textureCoordinate);
     constexpr sampler quadSampler2;
-    half4 overlay = inputTexture2.sample(quadSampler, fragmentInput.textureCoordinate2);
+    half4 overlay = inputTexture2.sample(quadSampler2, fragmentInput.textureCoordinate2);
     
     return half4(min(overlay.rgb * base.a, base.rgb * overlay.a) + overlay.rgb * (1.0h - base.a) + base.rgb * (1.0h - overlay.a), 1.0h);
 }
diff --git a/Sources/GPUImage/Operations/DifferenceBlend.metal b/Sources/GPUImage/Operations/DifferenceBlend.metal
@@ -9,7 +9,7 @@ fragment half4 differenceBlendFragment(TwoInputVertexIO fragmentInput [[stage_in
     constexpr sampler quadSampler;
     half4 textureColor = inputTexture.sample(quadSampler, fragmentInput.textureCoordinate);
     constexpr sampler quadSampler2;
-    half4 textureColor2 = inputTexture2.sample(quadSampler, fragmentInput.textureCoordinate2);
+    half4 textureColor2 = inputTexture2.sample(quadSampler2, fragmentInput.textureCoordinate2);
     
     return half4(abs(textureColor2.rgb - textureColor.rgb), textureColor.a);
 }
diff --git a/Sources/GPUImage/Operations/DissolveBlend.metal b/Sources/GPUImage/Operations/DissolveBlend.metal
@@ -15,7 +15,7 @@ fragment half4 dissolveBlendFragment(TwoInputVertexIO fragmentInput [[stage_in]]
     constexpr sampler quadSampler;
     half4 textureColor = inputTexture.sample(quadSampler, fragmentInput.textureCoordinate);
     constexpr sampler quadSampler2;
-    half4 textureColor2 = inputTexture2.sample(quadSampler, fragmentInput.textureCoordinate2);
+    half4 textureColor2 = inputTexture2.sample(quadSampler2, fragmentInput.textureCoordinate2);
 
     return mix(textureColor, textureColor2, half(uniform.mixturePercent));
 }
diff --git a/Sources/GPUImage/Operations/DivideBlend.metal b/Sources/GPUImage/Operations/DivideBlend.metal
@@ -9,7 +9,7 @@ fragment half4 divideBlendFragment(TwoInputVertexIO fragmentInput [[stage_in]],
     constexpr sampler quadSampler;
     half4 base = inputTexture.sample(quadSampler, fragmentInput.textureCoordinate);
     constexpr sampler quadSampler2;
-    half4 overlay = inputTexture2.sample(quadSampler, fragmentInput.textureCoordinate2);
+    half4 overlay = inputTexture2.sample(quadSampler2, fragmentInput.textureCoordinate2);
     
     half ra;
     if (overlay.a == 0.0h || ((base.r / overlay.r) > (base.a / overlay.a)))
diff --git a/Sources/GPUImage/Operations/ExclusionBlend.metal b/Sources/GPUImage/Operations/ExclusionBlend.metal
@@ -9,7 +9,7 @@ fragment half4 exclusionBlendFragment(TwoInputVertexIO fragmentInput [[stage_in]
     constexpr sampler quadSampler;
     half4 base = inputTexture.sample(quadSampler, fragmentInput.textureCoordinate);
     constexpr sampler quadSampler2;
-    half4 overlay = inputTexture2.sample(quadSampler, fragmentInput.textureCoordinate2);
+    half4 overlay = inputTexture2.sample(quadSampler2, fragmentInput.textureCoordinate2);
     
     return half4((overlay.rgb * base.a + base.rgb * overlay.a - 2.0h * overlay.rgb * base.rgb) + overlay.rgb * (1.0h - base.a) + base.rgb * (1.0h - overlay.a), base.a);
 }
diff --git a/Sources/GPUImage/Operations/HardLightBlend.metal b/Sources/GPUImage/Operations/HardLightBlend.metal
@@ -9,7 +9,7 @@ fragment half4 hardLightBlendFragment(TwoInputVertexIO fragmentInput [[stage_in]
     constexpr sampler quadSampler;
     half4 base = inputTexture.sample(quadSampler, fragmentInput.textureCoordinate);
     constexpr sampler quadSampler2;
-    half4 overlay = inputTexture2.sample(quadSampler, fragmentInput.textureCoordinate2);
+    half4 overlay = inputTexture2.sample(quadSampler2, fragmentInput.textureCoordinate2);
     
     half ra;
     if (2.0h * overlay.r < overlay.a) {
diff --git a/Sources/GPUImage/Operations/HueBlend.metal b/Sources/GPUImage/Operations/HueBlend.metal
@@ -12,7 +12,7 @@ fragment half4 hueBlendFragment(TwoInputVertexIO fragmentInput [[stage_in]],
     constexpr sampler quadSampler;
     half4 base = inputTexture.sample(quadSampler, fragmentInput.textureCoordinate);
     constexpr sampler quadSampler2;
-    half4 overlay = inputTexture2.sample(quadSampler, fragmentInput.textureCoordinate2);
+    half4 overlay = inputTexture2.sample(quadSampler2, fragmentInput.textureCoordinate2);
     
     return half4(base.rgb * (1.0h - overlay.a) + setlum(setsat(overlay.rgb, sat(base.rgb)), lum(base.rgb)) * overlay.a, base.a);
 }
diff --git a/Sources/GPUImage/Operations/LightenBlend.metal b/Sources/GPUImage/Operations/LightenBlend.metal
@@ -9,7 +9,7 @@ fragment half4 lightenBlendFragment(TwoInputVertexIO fragmentInput [[stage_in]],
     constexpr sampler quadSampler;
     half4 textureColor = inputTexture.sample(quadSampler, fragmentInput.textureCoordinate);
     constexpr sampler quadSampler2;
-    half4 textureColor2 = inputTexture2.sample(quadSampler, fragmentInput.textureCoordinate2);
+    half4 textureColor2 = inputTexture2.sample(quadSampler2, fragmentInput.textureCoordinate2);
     
     return max(textureColor, textureColor2);
 }
diff --git a/Sources/GPUImage/Operations/LinearBurnBlend.metal b/Sources/GPUImage/Operations/LinearBurnBlend.metal
@@ -9,7 +9,7 @@ fragment half4 linearBurnBlendFragment(TwoInputVertexIO fragmentInput [[stage_in
     constexpr sampler quadSampler;
     half4 textureColor = inputTexture.sample(quadSampler, fragmentInput.textureCoordinate);
     constexpr sampler quadSampler2;
-    half4 textureColor2 = inputTexture2.sample(quadSampler, fragmentInput.textureCoordinate2);
+    half4 textureColor2 = inputTexture2.sample(quadSampler2, fragmentInput.textureCoordinate2);
     
     return half4(clamp(textureColor.rgb + textureColor2.rgb - half3(1.0h), half3(0.0h), half3(1.0h)), textureColor.a);
 }
diff --git a/Sources/GPUImage/Operations/LuminosityBlend.metal b/Sources/GPUImage/Operations/LuminosityBlend.metal
@@ -10,7 +10,7 @@ fragment half4 luminosityBlendFragment(TwoInputVertexIO fragmentInput [[stage_in
     constexpr sampler quadSampler;
     half4 base = inputTexture.sample(quadSampler, fragmentInput.textureCoordinate);
     constexpr sampler quadSampler2;
-    half4 overlay = inputTexture2.sample(quadSampler, fragmentInput.textureCoordinate2);
+    half4 overlay = inputTexture2.sample(quadSampler2, fragmentInput.textureCoordinate2);
     
     return half4(base.rgb * (1.0h - overlay.a) + setlum(base.rgb, lum(overlay.rgb)) * overlay.a, base.a);
 }
diff --git a/Sources/GPUImage/Operations/MultiplyBlend.metal b/Sources/GPUImage/Operations/MultiplyBlend.metal
@@ -9,7 +9,7 @@ fragment half4 multiplyBlendFragment(TwoInputVertexIO fragmentInput [[stage_in]]
     constexpr sampler quadSampler;
     half4 base = inputTexture.sample(quadSampler, fragmentInput.textureCoordinate);
     constexpr sampler quadSampler2;
-    half4 overlay = inputTexture2.sample(quadSampler, fragmentInput.textureCoordinate2);
+    half4 overlay = inputTexture2.sample(quadSampler2, fragmentInput.textureCoordinate2);
     
     return overlay * base + overlay * (1.0h - base.a) + base * (1.0h - overlay.a);
 }
diff --git a/Sources/GPUImage/Operations/OverlayBlend.metal b/Sources/GPUImage/Operations/OverlayBlend.metal
@@ -9,7 +9,7 @@ fragment half4 overlayBlendFragment(TwoInputVertexIO fragmentInput [[stage_in]],
     constexpr sampler quadSampler;
     half4 base = inputTexture.sample(quadSampler, fragmentInput.textureCoordinate);
     constexpr sampler quadSampler2;
-    half4 overlay = inputTexture2.sample(quadSampler, fragmentInput.textureCoordinate2);
+    half4 overlay = inputTexture2.sample(quadSampler2, fragmentInput.textureCoordinate2);
     
     half ra;
     if (2.0h * base.r < base.a) {
diff --git a/Sources/GPUImage/Operations/SaturationBlend.metal b/Sources/GPUImage/Operations/SaturationBlend.metal
@@ -10,7 +10,7 @@ fragment half4 saturationBlendFragment(TwoInputVertexIO fragmentInput [[stage_in
     constexpr sampler quadSampler;
     half4 base = inputTexture.sample(quadSampler, fragmentInput.textureCoordinate);
     constexpr sampler quadSampler2;
-    half4 overlay = inputTexture2.sample(quadSampler, fragmentInput.textureCoordinate2);
+    half4 overlay = inputTexture2.sample(quadSampler2, fragmentInput.textureCoordinate2);
     
     return half4(base.rgb * (1.0h - overlay.a) + setlum(setsat(base.rgb, sat(overlay.rgb)), lum(base.rgb)) * overlay.a, base.a);
 }
diff --git a/Sources/GPUImage/Operations/ScreenBlend.metal b/Sources/GPUImage/Operations/ScreenBlend.metal
@@ -9,7 +9,7 @@ fragment half4 screenBlendFragment(TwoInputVertexIO fragmentInput [[stage_in]],
     constexpr sampler quadSampler;
     half4 textureColor = inputTexture.sample(quadSampler, fragmentInput.textureCoordinate);
     constexpr sampler quadSampler2;
-    half4 textureColor2 = inputTexture2.sample(quadSampler, fragmentInput.textureCoordinate2);
+    half4 textureColor2 = inputTexture2.sample(quadSampler2, fragmentInput.textureCoordinate2);
     half4 whiteColor = half4(1.0);
     
     return whiteColor - ((whiteColor - textureColor2) * (whiteColor - textureColor));
diff --git a/Sources/GPUImage/Operations/Sharpen.metal b/Sources/GPUImage/Operations/Sharpen.metal
@@ -1,87 +1,18 @@
 #include <metal_stdlib>
+#include "TexelSamplingTypes.h"
 using namespace metal;
 
-typedef struct
-{
-    float4 position [[position]];
-    
-    float2 textureCoordinate [[user(textureCoordinate)]];
-    float2 leftTextureCoordinate [[user(leftTextureCoordinate)]];
-    float2 rightTextureCoordinate [[user(rightTextureCoordinate)]];
-    float2 topTextureCoordinate [[user(topTextureCoordinate)]];
-    float2 bottomTextureCoordinate [[user(bottomTextureCoordinate)]];
-}  SharpenVertexIO;
-
-
-
-vertex SharpenVertexIO sharpenVertex(const device packed_float2 *position [[buffer(0)]],
-                                     const device packed_float2 *textureCoordinate [[buffer(1)]],
-                                     uint vid [[vertex_id]])
-{
-    SharpenVertexIO outputVertices;
-    
-    outputVertices.position = float4(position[vid], 0, 1.0);
-    
-    float2 widthStep = float2(1.0, 0.0);
-    float2 heightStep = float2(0.0, 1.0);
-    
-    outputVertices.textureCoordinate = textureCoordinate[vid];
-    outputVertices.leftTextureCoordinate = textureCoordinate[vid] - widthStep;
-    outputVertices.rightTextureCoordinate = textureCoordinate[vid] + widthStep;
-    outputVertices.topTextureCoordinate = textureCoordinate[vid] + heightStep;
-    outputVertices.bottomTextureCoordinate = textureCoordinate[vid] - heightStep;
-    
-    return outputVertices;
-}
-
-
-// Vertex Shader
-/*
- attribute vec4 position;
- attribute vec4 inputTextureCoordinate;
-
- uniform float texelWidth;
- uniform float texelHeight;
- uniform float sharpness;
-
- varying vec2 textureCoordinate;
- varying vec2 leftTextureCoordinate;
- varying vec2 rightTextureCoordinate;
- varying vec2 topTextureCoordinate;
- varying vec2 bottomTextureCoordinate;
-
- varying float centerMultiplier;
- varying float edgeMultiplier;
-
- void main()
- {
-     gl_Position = position;
-     
-     vec2 widthStep = vec2(texelWidth, 0.0);
-     vec2 heightStep = vec2(0.0, texelHeight);
-     
-     textureCoordinate = inputTextureCoordinate.xy;
-     leftTextureCoordinate = inputTextureCoordinate.xy - widthStep;
-     rightTextureCoordinate = inputTextureCoordinate.xy + widthStep;
-     topTextureCoordinate = inputTextureCoordinate.xy + heightStep;
-     bottomTextureCoordinate = inputTextureCoordinate.xy - heightStep;
-     
-     centerMultiplier = 1.0 + 4.0 * sharpness;
-     edgeMultiplier = sharpness;
- }
-
- */
-
 typedef struct {
     float sharpness;
 } SharpenUniform;
 
-fragment half4 sharpenFragment(SharpenVertexIO fragmentInput [[stage_in]],
+fragment half4 sharpenFragment(NearbyTexelVertexIO fragmentInput [[stage_in]],
                               texture2d<half> inputTexture [[texture(0)]],
                               constant SharpenUniform& uniform [[buffer(1)]])
 {
     constexpr sampler quadSampler(coord::pixel);
-    half3 centerColor = inputTexture.sample(quadSampler, fragmentInput.textureCoordinate).rgb;
+    half4 centerColorWithAlpha = inputTexture.sample(quadSampler, fragmentInput.textureCoordinate);
+    half3 centerColor = centerColorWithAlpha.rgb;
     half3 leftColor = inputTexture.sample(quadSampler, fragmentInput.leftTextureCoordinate).rgb;
     half3 rightColor = inputTexture.sample(quadSampler, fragmentInput.rightTextureCoordinate).rgb;
     half3 topColor = inputTexture.sample(quadSampler, fragmentInput.topTextureCoordinate).rgb;
@@ -91,32 +22,7 @@ fragment half4 sharpenFragment(SharpenVertexIO fragmentInput [[stage_in]],
     half centerMultiplier = 1.0 + 4.0 * edgeMultiplier;
     
     return half4((centerColor * centerMultiplier
-                  - (leftColor * edgeMultiplier + rightColor * edgeMultiplier+ topColor * edgeMultiplier + bottomColor * edgeMultiplier)),
-                 inputTexture.sample(quadSampler, fragmentInput.bottomTextureCoordinate).w);
+                  - (leftColor * edgeMultiplier + rightColor * edgeMultiplier + topColor * edgeMultiplier + bottomColor * edgeMultiplier)),
+                 centerColorWithAlpha.a);
     
 }
-// Fragment Shader
-/*
- varying vec2 textureCoordinate;
- varying vec2 leftTextureCoordinate;
- varying vec2 rightTextureCoordinate;
- varying vec2 topTextureCoordinate;
- varying vec2 bottomTextureCoordinate;
-
- varying float centerMultiplier;
- varying float edgeMultiplier;
-
- uniform sampler2D inputImageTexture;
-
- void main()
- {
-     vec3 textureColor = texture2D(inputImageTexture, textureCoordinate).rgb;
-     vec3 leftTextureColor = texture2D(inputImageTexture, leftTextureCoordinate).rgb;
-     vec3 rightTextureColor = texture2D(inputImageTexture, rightTextureCoordinate).rgb;
-     vec3 topTextureColor = texture2D(inputImageTexture, topTextureCoordinate).rgb;
-     vec3 bottomTextureColor = texture2D(inputImageTexture, bottomTextureCoordinate).rgb;
-     
-     gl_FragColor = vec4((textureColor * centerMultiplier - (leftTextureColor * edgeMultiplier + rightTextureColor * edgeMultiplier + topTextureColor * edgeMultiplier + bottomTextureColor * edgeMultiplier)), texture2D(inputImageTexture, bottomTextureCoordinate).w);
- }
-
- */
diff --git a/Sources/GPUImage/Operations/Sharpen.swift b/Sources/GPUImage/Operations/Sharpen.swift
@@ -1,20 +1,9 @@
-public class Sharpen: BasicOperation {
+public class Sharpen: TextureSamplingOperation {
     public var sharpness: Float = 0.0 { didSet { uniformSettings["sharpness"] = sharpness } }
-    public var overriddenTexelSize: Size?
 
     public init() {
-        super.init(
-            vertexFunctionName: "sharpenVertex", fragmentFunctionName: "sharpenFragment",
-            numberOfInputs: 1)
+        super.init(fragmentFunctionName: "sharpenFragment")
 
         ({ sharpness = 0.0 })()
     }
-
-    // Pretty sure this is OpenGL only
-    //    override func configureFramebufferSpecificUniforms(_ inputFramebuffer:Framebuffer) {
-    //        let outputRotation = overriddenOutputRotation ?? inputFramebuffer.orientation.rotationNeededForOrientation(.portrait)
-    //        let texelSize = overriddenTexelSize ?? inputFramebuffer.texelSize(for:outputRotation)
-    //        uniformSettings["texelWidth"] = texelSize.width
-    //        uniformSettings["texelHeight"] = texelSize.height
-    //    }
 }
diff --git a/Sources/GPUImage/Operations/SoftLightBlend.metal b/Sources/GPUImage/Operations/SoftLightBlend.metal
@@ -9,7 +9,7 @@ fragment half4 softLightBlendFragment(TwoInputVertexIO fragmentInput [[stage_in]
     constexpr sampler quadSampler;
     half4 base = inputTexture.sample(quadSampler, fragmentInput.textureCoordinate);
     constexpr sampler quadSampler2;
-    half4 overlay = inputTexture2.sample(quadSampler, fragmentInput.textureCoordinate2);
+    half4 overlay = inputTexture2.sample(quadSampler2, fragmentInput.textureCoordinate2);
     
     half alphaDivisor = base.a + step(base.a, 0.0h); // Protect against a divide-by-zero blacking out things in the output
     
diff --git a/Sources/GPUImage/Operations/SourceOverBlend.metal b/Sources/GPUImage/Operations/SourceOverBlend.metal
@@ -9,7 +9,7 @@ fragment half4 sourceOverBlendFragment(TwoInputVertexIO fragmentInput [[stage_in
     constexpr sampler quadSampler;
     half4 textureColor = inputTexture.sample(quadSampler, fragmentInput.textureCoordinate);
     constexpr sampler quadSampler2;
-    half4 textureColor2 = inputTexture2.sample(quadSampler, fragmentInput.textureCoordinate2);
+    half4 textureColor2 = inputTexture2.sample(quadSampler2, fragmentInput.textureCoordinate2);
     
     return mix(textureColor, textureColor2, textureColor2.a);
 }
diff --git a/Sources/GPUImage/Operations/SubtractBlend.metal b/Sources/GPUImage/Operations/SubtractBlend.metal
@@ -9,7 +9,7 @@ fragment half4 subtractBlendFragment(TwoInputVertexIO fragmentInput [[stage_in]]
     constexpr sampler quadSampler;
     half4 textureColor = inputTexture.sample(quadSampler, fragmentInput.textureCoordinate);
     constexpr sampler quadSampler2;
-    half4 textureColor2 = inputTexture2.sample(quadSampler, fragmentInput.textureCoordinate2);
+    half4 textureColor2 = inputTexture2.sample(quadSampler2, fragmentInput.textureCoordinate2);
     
     return half4(textureColor.rgb - textureColor2.rgb, textureColor.a);
 }
diff --git a/examples/Mac/FilterShowcase/FilterShowcase/FilterOperations.swift b/examples/Mac/FilterShowcase/FilterShowcase/FilterOperations.swift
@@ -111,16 +111,16 @@ let filterOperations: [FilterOperationInterface] = [
         sliderUpdateCallback: nil,
         filterOperationType: .singleInput
     ),
-    //    FilterOperation(
-    //        filter:{Sharpen()},
-    //        listName:"Sharpen",
-    //        titleName:"Sharpen",
-    //        sliderConfiguration:.enabled(minimumValue:-1.0, maximumValue:4.0, initialValue:0.0),
-    //        sliderUpdateCallback: {(filter, sliderValue) in
-    //            filter.sharpness = sliderValue
-    //        },
-    //        filterOperationType:.singleInput
-    //    ),
+    FilterOperation(
+        filter: { Sharpen() },
+        listName: "Sharpen",
+        titleName: "Sharpen",
+        sliderConfiguration: .enabled(minimumValue: -1.0, maximumValue: 4.0, initialValue: 0.0),
+        sliderUpdateCallback: { (filter, sliderValue) in
+            filter.sharpness = sliderValue
+        },
+        filterOperationType: .singleInput
+    ),
     //    FilterOperation(
     //        filter:{UnsharpMask()},
     //        listName:"Unsharp mask",

Original file line number	Diff line number	Diff line change
`@@ -15,7 +15,7 @@ fragment half4 alphaBlendFragment(TwoInputVertexIO fragmentInput [[stage_in]],`
`15`	`15`	`constexpr sampler quadSampler;`
`16`	`16`	`half4 textureColor = inputTexture.sample(quadSampler, fragmentInput.textureCoordinate);`
`17`	`17`	`constexpr sampler quadSampler2;`
`18`		`- half4 textureColor2 = inputTexture2.sample(quadSampler, fragmentInput.textureCoordinate2);`
	`18`	`+ half4 textureColor2 = inputTexture2.sample(quadSampler2, fragmentInput.textureCoordinate2);`
`19`	`19`
`20`	`20`	`return half4(mix(textureColor.rgb, textureColor2.rgb, textureColor2.a * half(uniform.mixturePercent)), textureColor.a);`
`21`	`21`	`}`
Original file line number	Diff line number	Diff line change
`@@ -10,7 +10,7 @@ fragment half4 colorBlendFragment(TwoInputVertexIO fragmentInput [[stage_in]],`
`10`	`10`	`constexpr sampler quadSampler;`
`11`	`11`	`half4 base = inputTexture.sample(quadSampler, fragmentInput.textureCoordinate);`
`12`	`12`	`constexpr sampler quadSampler2;`
`13`		`- half4 overlay = inputTexture2.sample(quadSampler, fragmentInput.textureCoordinate2);`
	`13`	`+ half4 overlay = inputTexture2.sample(quadSampler2, fragmentInput.textureCoordinate2);`
`14`	`14`
`15`	`15`	`return half4(base.rgb * (1.0h - overlay.a) + setlum(overlay.rgb, lum(base.rgb)) * overlay.a, base.a);`
`16`	`16`	`}`
Original file line number	Diff line number	Diff line change
`@@ -9,7 +9,7 @@ fragment half4 darkenBlendFragment(TwoInputVertexIO fragmentInput [[stage_in]],`
`9`	`9`	`constexpr sampler quadSampler;`
`10`	`10`	`half4 base = inputTexture.sample(quadSampler, fragmentInput.textureCoordinate);`
`11`	`11`	`constexpr sampler quadSampler2;`
`12`		`- half4 overlay = inputTexture2.sample(quadSampler, fragmentInput.textureCoordinate2);`
	`12`	`+ half4 overlay = inputTexture2.sample(quadSampler2, fragmentInput.textureCoordinate2);`
`13`	`13`
`14`	`14`	`return half4(min(overlay.rgb * base.a, base.rgb * overlay.a) + overlay.rgb * (1.0h - base.a) + base.rgb * (1.0h - overlay.a), 1.0h);`
`15`	`15`	`}`
Original file line number	Diff line number	Diff line change
`@@ -9,7 +9,7 @@ fragment half4 differenceBlendFragment(TwoInputVertexIO fragmentInput [[stage_in`
`9`	`9`	`constexpr sampler quadSampler;`
`10`	`10`	`half4 textureColor = inputTexture.sample(quadSampler, fragmentInput.textureCoordinate);`
`11`	`11`	`constexpr sampler quadSampler2;`
`12`		`- half4 textureColor2 = inputTexture2.sample(quadSampler, fragmentInput.textureCoordinate2);`
	`12`	`+ half4 textureColor2 = inputTexture2.sample(quadSampler2, fragmentInput.textureCoordinate2);`
`13`	`13`
`14`	`14`	`return half4(abs(textureColor2.rgb - textureColor.rgb), textureColor.a);`
`15`	`15`	`}`
Original file line number	Diff line number	Diff line change
`@@ -15,7 +15,7 @@ fragment half4 dissolveBlendFragment(TwoInputVertexIO fragmentInput [[stage_in]]`
`15`	`15`	`constexpr sampler quadSampler;`
`16`	`16`	`half4 textureColor = inputTexture.sample(quadSampler, fragmentInput.textureCoordinate);`
`17`	`17`	`constexpr sampler quadSampler2;`
`18`		`- half4 textureColor2 = inputTexture2.sample(quadSampler, fragmentInput.textureCoordinate2);`
	`18`	`+ half4 textureColor2 = inputTexture2.sample(quadSampler2, fragmentInput.textureCoordinate2);`
`19`	`19`
`20`	`20`	`return mix(textureColor, textureColor2, half(uniform.mixturePercent));`
`21`	`21`	`}`