125 lines
4.5 KiB
HLSL
Executable file
125 lines
4.5 KiB
HLSL
Executable file
#ifndef POI_GRAB
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#define POI_GRAB
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float _RefractionIndex;
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float _RefractionOpacity;
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float _RefractionChromaticAberattion;
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float _RefractionEnabled;
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float _GrabSrcBlend;
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float _GrabDstBlend;
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float _GrabPassUseAlpha;
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float _GrabPassBlendFactor;
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float _GrabBlurDistance;
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float _GrabBlurQuality;
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float _GrabBlurDirections;
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POI_TEXTURE_NOSAMPLER(_GrabPassBlendMap);
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float4 blur(float2 uv)
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{
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float two_pi = 6.28318530718;
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float2 radius = _GrabBlurDistance / _ScreenParams.xy * 100; // Arbitrary constant to match old blur
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float quality = floor(_GrabBlurQuality);
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float directions = floor(_GrabBlurDirections);
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// Pixel colour
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float4 color = tex2D(_PoiGrab, uv);
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float deltaAngle = two_pi / directions;
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float deltaQuality = 1.0 / quality;
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for (int i = 0; i < directions; i ++)
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{
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for (int j = 0; j < quality; j ++)
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{
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float angle = deltaAngle * i + j;
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float offset = deltaQuality * (j + 1);
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color += tex2D(_PoiGrab, uv + float2(cos(angle), sin(angle)) * radius * offset);
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}
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}
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// Output to screen
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color /= quality * directions + 1;
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return color;
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}
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inline float4 Refraction(float indexOfRefraction, float chromaticAberration, float2 projectedGrabPos)
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{
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float4 refractionColor;
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float3 worldViewDir = normalize(UnityWorldSpaceViewDir(poiMesh.worldPos));
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float3 refractionOffset = ((((indexOfRefraction - 1.0) * mul(UNITY_MATRIX_V, float4(poiMesh.normals[1], 0.0)).xyz) * (1.0 / (poiCam.grabPos.z + 1.0))) * (1.0 - dot(poiMesh.normals[1], worldViewDir)));
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float2 cameraRefraction = float2(refractionOffset.x, - (refractionOffset.y * _ProjectionParams.x));
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UNITY_BRANCH
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if (_RefractionChromaticAberattion > 0)
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{
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float4 redAlpha = tex2D(_PoiGrab, (projectedGrabPos + cameraRefraction));
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float green = tex2D(_PoiGrab, (projectedGrabPos + (cameraRefraction * (1.0 - chromaticAberration)))).g;
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float blue = tex2D(_PoiGrab, (projectedGrabPos + (cameraRefraction * (1.0 + chromaticAberration)))).b;
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refractionColor = float4(redAlpha.r, green, blue, redAlpha.a);
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}
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else
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{
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float2 refractedGrab = projectedGrabPos + cameraRefraction;
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#ifdef CHROMATIC_ABERRATION_LOW
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refractionColor = blur(refractedGrab);
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#else
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refractionColor = tex2D(_PoiGrab, (refractedGrab));
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#endif
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}
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return refractionColor;
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}
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void calculateRefraction(float2 projectedGrabPos, inout float4 finalColor)
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{
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float3 refraction = 1;
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UNITY_BRANCH
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if(_RefractionEnabled == 1)
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{
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refraction = Refraction(_RefractionIndex, _RefractionChromaticAberattion, projectedGrabPos).rgb;
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}
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else
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{
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#ifdef CHROMATIC_ABERRATION_LOW
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refraction = blur(projectedGrabPos);
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#else
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refraction = tex2Dproj(_PoiGrab, poiCam.grabPos).rgb;
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#endif
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}
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float blendFactor = _GrabPassBlendFactor * POI2D_SAMPLER_PAN(_GrabPassBlendMap, _MainTex, poiMesh.uv[_GrabPassBlendMapUV], _GrabPassBlendMapPan).r;
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UNITY_BRANCH
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if(_GrabPassUseAlpha)
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{
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finalColor = poiBlend(_GrabSrcBlend, finalColor, _GrabDstBlend, float4(refraction, 1), blendFactor * (1 - finalColor.a));
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finalColor.a = 1;
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}
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else
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{
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finalColor = poiBlend(_GrabSrcBlend, finalColor, _GrabDstBlend, float4(refraction, 1), blendFactor);
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}
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}
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float2 calculateGrabPosition()
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{
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float4 grabPos = poiCam.grabPos;
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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 = grabPos.w * 0.5;
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grabPos.y = (grabPos.y - halfPosW) * _ProjectionParams.x * scale + halfPosW;
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#if SHADER_API_D3D9 || SHADER_API_D3D11
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grabPos.w += 0.00000000001;
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#endif
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return(grabPos / grabPos.w).xy;
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}
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void applyGrabEffects(inout float4 finalColor)
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{
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float2 projectedGrabPos = calculateGrabPosition();
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calculateRefraction(projectedGrabPos, finalColor);
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}
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#endif |