duckstation/data/shaders/simple-sharpen.glsl

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void main()
{
vec2 uv = GetCoordinates();
vec2 ts = GetInvResolution();
vec4 sum = vec4(0.0, 0.0, 0.0, 0.0);
sum += SampleLocation(uv + vec2(-1.0, 0.0) * ts) * -1.0;
sum += SampleLocation(uv + vec2(0.0, -1.0) * ts) * -1.0;
sum += SampleLocation(uv) * 5.0;
sum += SampleLocation(uv + vec2(0.0, 1.0) * ts) * -1.0;
sum += SampleLocation(uv + vec2(1.0, 0.0) * ts) * -1.0;
SetOutput(saturate(sum));
}