42 lines
1.6 KiB
HLSL
42 lines
1.6 KiB
HLSL
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#ifndef VOLUMETRIC_FOG_2_SURFACE
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#define VOLUMETRIC_FOG_2_SURFACE
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#if VF2_SURFACE
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float4x4 _SurfaceCaptureMatrix;
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TEXTURE2D_FLOAT(_SurfaceDepthTexture);
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SAMPLER(sampler_SurfaceDepthTexture);
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float4 _SurfaceData;
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#define SURFACE_CAM_ALTITUDE _SurfaceData.x
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#define TERRAIN_FOG_HEIGHT _SurfaceData.y
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#define TERRAIN_FOG_MIN_ALTITUDE _SurfaceData.z
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#define TERRAIN_FOG_MAX_ALTITUDE _SurfaceData.w
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float4 surfaceTexCoordsStart, surfaceTexCoordsEnd;
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void SurfaceComputeEndPoints(float3 wposStart, float3 wposEnd) {
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surfaceTexCoordsStart = mul(_SurfaceCaptureMatrix, float4(wposStart, 1.0));
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surfaceTexCoordsStart.xy /= surfaceTexCoordsStart.w;
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surfaceTexCoordsEnd = mul(_SurfaceCaptureMatrix, float4(wposEnd, 1.0));
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surfaceTexCoordsEnd.xy /= surfaceTexCoordsEnd.w;
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}
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void SurfaceApply(inout float3 boundsCenter, inout float3 boundsExtents) {
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float2 surfaceTexCoords = lerp(surfaceTexCoordsStart.xy, surfaceTexCoordsEnd.xy, loop_t);
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float surfaceDepth = SAMPLE_TEXTURE2D_LOD(_SurfaceDepthTexture, sampler_SurfaceDepthTexture, surfaceTexCoords, 0).r;
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#if UNITY_REVERSED_Z
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surfaceDepth = 1.0 - surfaceDepth;
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#endif
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boundsExtents.y = TERRAIN_FOG_HEIGHT;
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boundsCenter.y = clamp(SURFACE_CAM_ALTITUDE - surfaceDepth * 10000, TERRAIN_FOG_MIN_ALTITUDE, TERRAIN_FOG_MAX_ALTITUDE);
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}
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#else
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#define SurfaceComputeEndPoints(wposStart, wposEnd)
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#define SurfaceApply(boundsCenter, boundsExtents)
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#endif // VF2_SURFACE
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#endif // VOLUMETRIC_FOG_2_SURFACE
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