126 lines
4.7 KiB
Plaintext
126 lines
4.7 KiB
Plaintext
Shader "Hidden/EnviroCloudsRaymarch"
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{
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Properties
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{
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//_MainTex ("Texture", any) = "white" {}
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}
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SubShader
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{
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// No culling or depth
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Cull Off ZWrite Off ZTest Always
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Pass
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{
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CGPROGRAM
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#pragma vertex vert
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#pragma fragment frag
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#pragma multi_compile_local _ ENVIRO_DEPTH_BLENDING
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#pragma multi_compile_local _ ENVIRO_CLOUD_SHADOWS
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#pragma multi_compile_local _ ENVIRO_LIGHTNING
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#pragma multi_compile_local _ ENVIRO_VARIABLE_BOTTOM
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#pragma multi_compile _ ENVIROURP
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#include "UnityCG.cginc"
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#include_with_pragmas "../Includes/VolumetricCloudsInclude.cginc"
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#include_with_pragmas "../Includes/VolumetricCloudsTexInclude.cginc"
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int _Frame;
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uniform float _BlueNoiseIntensity;
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float4 _CameraDepthTexture_TexelSize;
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struct v2f
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{
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float4 position : SV_POSITION;
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float2 uv : TEXCOORD0;
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float2 uv00 : TEXCOORD1;
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float2 uv10 : TEXCOORD2;
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float2 uv01 : TEXCOORD3;
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float2 uv11 : TEXCOORD4;
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UNITY_VERTEX_OUTPUT_STEREO
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};
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struct appdata
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{
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float4 vertex : POSITION;
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float2 texcoord : TEXCOORD0;
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UNITY_VERTEX_INPUT_INSTANCE_ID
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};
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v2f vert (appdata_img v)
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{
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v2f o;
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UNITY_SETUP_INSTANCE_ID(v);
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UNITY_INITIALIZE_OUTPUT(v2f, o);
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UNITY_INITIALIZE_VERTEX_OUTPUT_STEREO(o);
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#if defined(ENVIROURP)
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o.position = float4(v.vertex.xyz,1.0);
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#if UNITY_UV_STARTS_AT_TOP
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o.position.y *= -1;
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#endif
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#else
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o.position = UnityObjectToClipPos(v.vertex);
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#endif
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o.uv = v.texcoord;
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o.uv00 = v.texcoord - 0.5 * _CameraDepthTexture_TexelSize.xy;
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o.uv10 = o.uv00 + float2(_CameraDepthTexture_TexelSize.x, 0.0);
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o.uv01 = o.uv00 + float2(0.0, _CameraDepthTexture_TexelSize.y);
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o.uv11 = o.uv00 + _CameraDepthTexture_TexelSize.xy;
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return o;
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}
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float4 frag (v2f i) : SV_Target
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{
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UNITY_SETUP_STEREO_EYE_INDEX_POST_VERTEX(i);
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float4 cameraRay = float4(i.uv * 2.0 - 1.0, 1.0, 1.0);
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float3 EyePosition = _CameraPosition;
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float3 ray = 0;
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if (unity_StereoEyeIndex == 0)
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{
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cameraRay = mul(_InverseProjection, cameraRay);
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cameraRay = cameraRay / cameraRay.w;
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ray = normalize(mul((float3x3)_InverseRotation, cameraRay.xyz));
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}
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else
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{
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cameraRay = mul(_InverseProjectionRight, cameraRay);
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cameraRay = cameraRay / cameraRay.w;
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ray = normalize(mul((float3x3)_InverseRotationRight, cameraRay.xyz));
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}
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float rayLength = length(ray);
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float sceneDepth = UNITY_SAMPLE_SCREENSPACE_TEXTURE(_DownsampledDepth, UnityStereoTransformScreenSpaceTex(i.uv));
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float3 cameraDirection = -1 * transpose(_InverseRotation)[2].xyz;
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float fwdFactor = dot(ray, cameraDirection);
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float raymarchEnd = GetRaymarchEndFromSceneDepth(Linear01Depth(sceneDepth) / fwdFactor, 1000000);
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float offset = tex2D(_BlueNoise, squareUV(i.uv + _Randomness.xy)).x * _BlueNoiseIntensity;
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float3 pCent = float3(EyePosition.x, -_CloudsParameter.w, EyePosition.z);
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float intensity, distance, alpha, shadow = 0.0f;
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RaymarchParameters parameters;
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InitRaymarchParameters(parameters);
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float2 hitDistance = ResolveRay(EyePosition,ray,pCent,raymarchEnd,parameters);
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float3 result = Raymarch(EyePosition,ray,hitDistance,pCent,parameters,offset);
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#if ENVIRO_CLOUD_SHADOWS
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float3 wpos = CalculateWorldPosition(i.uv,sceneDepth) - _WorldOffset;
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shadow = RaymarchShadows(EyePosition,wpos,ray,pCent,parameters,offset,sceneDepth);
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#endif
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intensity = result.r;
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distance = result.g;
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alpha = result.b;
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return float4(max(intensity,0.0),max(distance,1.0f),clamp(shadow,0.0,0.25),saturate(alpha));
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}
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ENDCG
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}
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}
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} |