Migrate shadereffects example to be cross-backend

...while demonstrating best practices like file selectors.

Task-number: QTBUG-52914
Change-Id: Ibf7bca77b7b142f5ccb956e05efc5be974d53c79
Reviewed-by: Andy Nichols <andy.nichols@qt.io>

1 files changed, 21 insertions, 0 deletions

diff --git a/examples/quick/shadereffects/content/shaders/+hlsl/outline.frag b/examples/quick/shadereffects/content/shaders/+hlsl/outline.frag
new file mode 100644
index 0000000000..b6e7e51f35
--- /dev/null
+++ b/examples/quick/shadereffects/content/shaders/+hlsl/outline.frag
@@ -0,0 +1,21 @@
+cbuffer ConstantBuffer : register(b0)
+{
+    float4x4 qt_Matrix;
+    float qt_Opacity;
+    float2 delta;
+};
+
+Texture2D source : register(t0);
+SamplerState sourceSampler : register(s0);
+
+float4 main(float4 position : SV_POSITION, float2 coord : TEXCOORD0) : SV_TARGET
+{
+    float4 tl = source.Sample(sourceSampler, coord - delta);
+    float4 tr = source.Sample(sourceSampler, coord + float2(delta.x, -delta.y));
+    float4 bl = source.Sample(sourceSampler, coord - float2(delta.x, -delta.y));
+    float4 br = source.Sample(sourceSampler, coord + delta);
+    float4 gx = (tl + bl) - (tr + br);
+    float4 gy = (tl + tr) - (bl + br);
+    return float4(0.0, 0.0, 0.0,
+                  clamp(dot(sqrt(gx * gx + gy * gy), float4(1.0, 1.0, 1.0, 1.0)), 0.0, 1.0) * qt_Opacity);
+}