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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);
}
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