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#ifndef REFRACTION
#define REFRACTION
sampler2D _PoiGrab;
float _IndexOfRefraction;
float _RefractionOpacity;
UNITY_DECLARE_TEX2D_NOSAMPLER(_RefractionOpacityMask); float4 _RefractionOpacityMask_ST;
float3 refraction;
float refractionOpacityMask;
inline float4 Refraction(v2f i, float indexOfRefraction/*, float chomaticAberration*/)
{
float4 screenPos = i.screenPos;
#if UNITY_UV_STARTS_AT_TOP
float scale = -1.0;
#else
float scale = 1.0;
#endif
float halfPosW = screenPos.w * 0.5;
screenPos.y = (screenPos.y - halfPosW) * _ProjectionParams.x * scale + halfPosW;
#if SHADER_API_D3D9 || SHADER_API_D3D11
screenPos.w += 0.00000000001;
#endif
float2 projScreenPos = (screenPos / screenPos.w).xy;
float3 worldViewDir = normalize(UnityWorldSpaceViewDir(i.worldPos));
float3 refractionOffset = ((((indexOfRefraction - 1.0) * mul(UNITY_MATRIX_V, float4(i.normal, 0.0))) * (1.0 / (screenPos.z + 1.0))) * (1.0 - dot(i.normal, worldViewDir)));
float2 cameraRefraction = float2(refractionOffset.x, - (refractionOffset.y * _ProjectionParams.x));
return tex2D(_PoiGrab, (projScreenPos + cameraRefraction));
/*
float4 redAlpha = tex2D(_GrabTexture, (projScreenPos + cameraRefraction));
float green = tex2D(_GrabTexture, (projScreenPos + (cameraRefraction * (1.0 - chomaticAberration)))).g;
float blue = tex2D(_GrabTexture, (projScreenPos + (cameraRefraction * (1.0 + chomaticAberration)))).b;
return float4(redAlpha.r, green, blue, redAlpha.a);
*/
}
void calculateRefraction(v2f i)
{
refraction = Refraction(i, _IndexOfRefraction).rgb;
refractionOpacityMask = UNITY_SAMPLE_TEX2D_SAMPLER(_RefractionOpacityMask, _MainTex, TRANSFORM_TEX(i.uv, _RefractionOpacityMask));
}
void applyRefraction(inout float4 finalColor)
{
finalColor.rgb = lerp(refraction, finalColor, _RefractionOpacity * refractionOpacityMask);
}
#endif
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