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