35 lines
925 B
HLSL
35 lines
925 B
HLSL
#ifndef UNITY_POSTFX_DISTORTION
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#define UNITY_POSTFX_DISTORTION
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float4 _Distortion_Amount;
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float4 _Distortion_CenterScale;
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float2 Distort(float2 uv)
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{
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// Note: lens distortion is automatically disabled in VR so we won't bother handling stereo uvs
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#if DISTORT
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{
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uv = (uv - 0.5) * _Distortion_Amount.z + 0.5;
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float2 ruv = _Distortion_CenterScale.zw * (uv - 0.5 - _Distortion_CenterScale.xy);
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float ru = length(float2(ruv));
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UNITY_BRANCH
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if (_Distortion_Amount.w > 0.0)
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{
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float wu = ru * _Distortion_Amount.x;
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ru = tan(wu) * (1.0 / (ru * _Distortion_Amount.y));
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uv = uv + ruv * (ru - 1.0);
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}
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else
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{
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ru = (1.0 / ru) * _Distortion_Amount.x * atan(ru * _Distortion_Amount.y);
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uv = uv + ruv * (ru - 1.0);
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}
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}
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#endif
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return uv;
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}
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#endif // UNITY_POSTFX_DISTORTION
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