Add missing shaders

resources/shaders/gl3/mask_winding.fs.glsl

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+#version {{version}}
+// Automatically generated from files in pathfinder/shaders/. Do not edit!
+
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+
+
+precision highp float;
+
+uniform sampler2D uMaskTexture;
+
+in vec2 vMaskTexCoord;
+in float vBackdrop;
+
+out vec4 oFragColor;
+
+void main(){
+    oFragColor = vec4(abs(texture(uMaskTexture, vMaskTexCoord). r + vBackdrop));
+}
+

resources/shaders/gl3/mask_winding.vs.glsl

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+#version {{version}}
+// Automatically generated from files in pathfinder/shaders/. Do not edit!
+
+
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+
+precision highp float;
+
+in vec2 aPosition;
+in vec2 aMaskTexCoord;
+in int aBackdrop;
+
+out vec2 vMaskTexCoord;
+out float vBackdrop;
+
+void main(){
+    vMaskTexCoord = aMaskTexCoord;
+    vBackdrop = float(aBackdrop);
+    gl_Position = vec4(mix(vec2(- 1.0, - 1.0), vec2(1.0, 1.0), aPosition), 0.0, 1.0);
+}
+

resources/shaders/metal/mask_winding.fs.metal

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+// Automatically generated from files in pathfinder/shaders/. Do not edit!
+#include <metal_stdlib>
+#include <simd/simd.h>
+
+using namespace metal;
+
+struct spvDescriptorSetBuffer0
+{
+    texture2d<float> uMaskTexture [[id(0)]];
+    sampler uMaskTextureSmplr [[id(1)]];
+};
+
+struct main0_out
+{
+    float4 oFragColor [[color(0)]];
+};
+
+struct main0_in
+{
+    float2 vMaskTexCoord [[user(locn0)]];
+    float vBackdrop [[user(locn1)]];
+};
+
+fragment main0_out main0(main0_in in [[stage_in]], constant spvDescriptorSetBuffer0& spvDescriptorSet0 [[buffer(0)]])
+{
+    main0_out out = {};
+    out.oFragColor = float4(abs(spvDescriptorSet0.uMaskTexture.sample(spvDescriptorSet0.uMaskTextureSmplr, in.vMaskTexCoord).x + in.vBackdrop));
+    return out;
+}
+

resources/shaders/metal/mask_winding.vs.metal

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+// Automatically generated from files in pathfinder/shaders/. Do not edit!
+#include <metal_stdlib>
+#include <simd/simd.h>
+
+using namespace metal;
+
+struct main0_out
+{
+    float2 vMaskTexCoord [[user(locn0)]];
+    float vBackdrop [[user(locn1)]];
+    float4 gl_Position [[position]];
+};
+
+struct main0_in
+{
+    float2 aPosition [[attribute(0)]];
+    float2 aMaskTexCoord [[attribute(1)]];
+    int aBackdrop [[attribute(2)]];
+};
+
+vertex main0_out main0(main0_in in [[stage_in]])
+{
+    main0_out out = {};
+    out.vMaskTexCoord = in.aMaskTexCoord;
+    out.vBackdrop = float(in.aBackdrop);
+    out.gl_Position = float4(mix(float2(-1.0), float2(1.0), in.aPosition), 0.0, 1.0);
+    return out;
+}
+