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#ifndef POI_UV_DISTORTION
#define POI_UV_DISTORTION
#if defined(PROP_DISTORTIONFLOWTEXTURE) || !defined(OPTIMIZER_ENABLED)
UNITY_DECLARE_TEX2D_NOSAMPLER(_DistortionFlowTexture); float4 _DistortionFlowTexture_ST;
#endif
#if defined(PROP_DISTORTIONFLOWTEXTURE1) || !defined(OPTIMIZER_ENABLED)
UNITY_DECLARE_TEX2D_NOSAMPLER(_DistortionFlowTexture1); float4 _DistortionFlowTexture1_ST;
#endif
#if defined(PROP_DISTORTIONMASK) || !defined(OPTIMIZER_ENABLED)
POI_TEXTURE_NOSAMPLER(_DistortionMask);
#endif
half _DistortionStrength;
half _DistortionStrength1;
half2 _DistortionSpeed;
half2 _DistortionSpeed1;
#ifdef POI_AUDIOLINK
half _EnableDistortionAudioLink;
half2 _DistortionStrengthAudioLink;
half _DistortionStrengthAudioLinkBand;
half2 _DistortionStrength1AudioLink;
half _DistortionStrength1AudioLinkBand;
#endif
float2 getTorusUv(float2 uv)
{
// translated to hlsl from https://www.shadertoy.com/view/Md3Bz7
// http://web.cs.ucdavis.edu/~amenta/s12/findnorm.pdf
float phi = 6.28318530718f * uv.x;
float theta = 6.28318530718f * uv.y;
float3 c = cos(float3(phi, phi + 1.57079632679f, theta));
float2 result = float2(c.x * c.z, -c.y * c.z);
return result * 0.5 + 0.5;
}
float2 calculateDistortionUV(float2 uv)
{
#if defined(PROP_DISTORTIONFLOWTEXTURE) || !defined(OPTIMIZER_ENABLED)
float4 flowVector = UNITY_SAMPLE_TEX2D_SAMPLER(_DistortionFlowTexture, _MainTex, TRANSFORM_TEX(poiMesh.uv[0], _DistortionFlowTexture) + _Time.x * _DistortionSpeed) * 2 - 1;
#else
float4 flowVector = 0;
#endif
#if defined(PROP_DISTORTIONFLOWTEXTURE1) || !defined(OPTIMIZER_ENABLED)
float4 flowVector1 = UNITY_SAMPLE_TEX2D_SAMPLER(_DistortionFlowTexture1, _MainTex, TRANSFORM_TEX(poiMesh.uv[0], _DistortionFlowTexture1) + _Time.x * _DistortionSpeed1) * 2 - 1;
#else
float4 flowVector1 = 0;
#endif
#if defined(PROP_DISTORTIONMASK) || !defined(OPTIMIZER_ENABLED)
half distortionMask = POI2D_SAMPLER_PAN(_DistortionMask, _MainTex, poiMesh.uv[_DistortionMaskUV], _DistortionMaskPan).r;
#else
half distortionMask = 1;
#endif
half distortionStrength = _DistortionStrength;
half distortionStrength1 = _DistortionStrength1;
#ifdef POI_AUDIOLINK
UNITY_BRANCH
if (poiMods.audioLinkTextureExists && _EnableDistortionAudioLink)
{
distortionStrength += lerp(_DistortionStrengthAudioLink.x, _DistortionStrengthAudioLink.y, poiMods.audioLink[_DistortionStrengthAudioLinkBand]);
distortionStrength1 += lerp(_DistortionStrength1AudioLink.x, _DistortionStrength1AudioLink.y, poiMods.audioLink[_DistortionStrength1AudioLinkBand]);
}
#endif
flowVector *= distortionStrength;
flowVector1 *= distortionStrength1;
return uv + ((flowVector.xy + flowVector1.xy) / 2) * distortionMask;
}
#endif
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