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