65 lines
1.6 KiB
HLSL
65 lines
1.6 KiB
HLSL
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#ifndef OVERHEAD_CLOUD_INCLUDED
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#define OVERHEAD_CLOUD_INCLUDED
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#include "JCommon.cginc"
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void CalculateOverheadCloudColor(
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float4 localPos,
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fixed4 cloudColor,
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fixed cloudAltitude,
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fixed cloudSize, fixed cloudStep,
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fixed animationSpeed,
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fixed flowX, fixed flowZ,
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fixed remapMin, fixed remapMax,
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out fixed4 color)
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{
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fixed3 rayDir = localPos.xyz;
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float3 cloudPlaneOrigin = float3(0, cloudAltitude, 0);
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float3 cloudPlaneNormal = float3(0, 1, 0);
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float rayLength = dot(cloudPlaneOrigin, cloudPlaneNormal) / (dot(rayDir, cloudPlaneNormal) + 0.000001);
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float3 intersectionPoint = rayDir * rayLength;
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fixed loop;
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#if SHADER_API_MOBILE
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loop = 1;
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#else
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loop = 2;
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#endif
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fixed noise = 0;
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fixed sample = 0;
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fixed noiseSize = cloudSize * 1000 + 0.0001;
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fixed noiseAmp = 1;
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fixed sign = -1;
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fixed2 span = fixed2(flowX, flowZ) * animationSpeed * _Time.y * 0.0001;
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for (fixed i = 0; i < loop; ++i)
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{
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sample = CloudTexLod0((intersectionPoint.xz) / noiseSize + sign * span) * noiseAmp;
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noise += sample;
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noiseSize *= 0.5;
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noiseAmp *= 0.5;
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sign *= -1;
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}
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noise = noise * 0.5 + 0.5;
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noise = noise * cloudColor.a;
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noise = lerp(remapMin, remapMax, noise);
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noise = saturate(noise);
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#if ALLOW_STEP_EFFECT
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noise = StepValue(noise, cloudStep);
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#endif
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color = fixed4(cloudColor.rgb, noise);
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float sqrCloudDiscRadius = 100000000;
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float sqrDistanceToCloudPlaneOrigin = SqrDistance(intersectionPoint, cloudPlaneOrigin);
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fixed fDistance = saturate(1 - InverseLerpUnclamped(0, sqrCloudDiscRadius, sqrDistanceToCloudPlaneOrigin));
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color.a *= fDistance * fDistance;
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fixed4 clear = fixed4(0, 0, 0, 0);
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color = lerp(clear, color, localPos.y > 0);
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}
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#endif
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