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cbuffer ConstantBuffer : register(b0)
{
float4x4 qt_Matrix;
float qt_Opacity;
float relativeSizeX;
float relativeSizeY;
float spread;
float4 color;
}
float linearstep(float e0, float e1, float x) { return clamp((x - e0) / (e1 - e0), 0.0, 1.0); }
float4 main(float4 position : SV_POSITION, float2 coord : TEXCOORD0) : SV_TARGET
{
float alpha =
smoothstep(0.0, relativeSizeX, 0.5 - abs(0.5 - coord.x)) *
smoothstep(0.0, relativeSizeY, 0.5 - abs(0.5 - coord.y));
float spreadMultiplier = linearstep(spread, 1.0 - spread, alpha);
return color * qt_Opacity * spreadMultiplier * spreadMultiplier;
}
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