292 lines
9.4 KiB
HLSL
292 lines
9.4 KiB
HLSL
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// Curved World <http://u3d.as/1W8h>
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// Copyright (c) Amazing Assets <https://amazingassets.world>
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///////////////////////////////////////////////////////////////////////
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// SpeedTree8Common.cginc
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#ifndef SPEEDTREE8_COMMON_INCLUDED
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#define SPEEDTREE8_COMMON_INCLUDED
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#include "UnityCG.cginc"
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#include "UnityPBSLighting.cginc"
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#include "SpeedTreeShaderLibrary.cginc"
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#if defined(ENABLE_WIND) && !defined(_WINDQUALITY_NONE)
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#define SPEEDTREE_Y_UP
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#include "SpeedTreeWind.cginc"
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UNITY_INSTANCING_BUFFER_START(STWind)
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UNITY_DEFINE_INSTANCED_PROP(float, _GlobalWindTime)
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UNITY_INSTANCING_BUFFER_END(STWind)
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#endif
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struct Input
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{
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half2 uv_MainTex : TEXCOORD0;
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fixed4 color : COLOR;
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#ifdef EFFECT_BACKSIDE_NORMALS
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fixed facing : VFACE;
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#endif
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};
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sampler2D _MainTex;
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fixed4 _Color;
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int _TwoSided;
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#ifdef EFFECT_BUMP
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sampler2D _BumpMap;
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#endif
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#ifdef EFFECT_EXTRA_TEX
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sampler2D _ExtraTex;
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#else
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half _Glossiness;
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half _Metallic;
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#endif
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#ifdef EFFECT_HUE_VARIATION
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half4 _HueVariationColor;
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#endif
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#ifdef EFFECT_BILLBOARD
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half _BillboardShadowFade;
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#endif
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#ifdef EFFECT_SUBSURFACE
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sampler2D _SubsurfaceTex;
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fixed4 _SubsurfaceColor;
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half _SubsurfaceIndirect;
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#endif
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#define GEOM_TYPE_BRANCH 0
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#define GEOM_TYPE_FROND 1
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#define GEOM_TYPE_LEAF 2
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#define GEOM_TYPE_FACINGLEAF 3
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///////////////////////////////////////////////////////////////////////
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// OffsetSpeedTreeVertex
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void OffsetSpeedTreeVertex(inout appdata_full data, float lodValue)
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{
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// smooth LOD
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#if defined(LOD_FADE_PERCENTAGE) && !defined(EFFECT_BILLBOARD)
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data.vertex.xyz = lerp(data.vertex.xyz, data.texcoord2.xyz, lodValue);
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#endif
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// determine vertex geom type
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float geometryType = (int)(data.texcoord3.w + 0.25);
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bool leafTwo = false;
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if (geometryType > GEOM_TYPE_FACINGLEAF)
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{
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geometryType -= 2;
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leafTwo = true;
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}
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// camera facing leaves
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#if !defined(EFFECT_BILLBOARD)
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if (geometryType == GEOM_TYPE_FACINGLEAF)
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{
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float3 anchor = float3(data.texcoord1.zw, data.texcoord2.w);
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data.vertex.xyz = DoLeafFacing(data.vertex.xyz, anchor);
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}
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#endif
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// wind
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#if defined(ENABLE_WIND) && !defined(_WINDQUALITY_NONE)
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float3 rotatedWindVector = TransformWindVectorFromWorldToLocalSpace(_ST_WindVector.xyz);
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if(dot(rotatedWindVector,rotatedWindVector) < 1e-4)
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{
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return; // bail out if no wind data
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}
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float3 treePos = float3(unity_ObjectToWorld[0].w, unity_ObjectToWorld[1].w, unity_ObjectToWorld[2].w);
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float3 windyPosition = data.vertex.xyz;
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#ifndef EFFECT_BILLBOARD
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// leaves
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if (geometryType > GEOM_TYPE_FROND)
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{
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#if defined(_WINDQUALITY_FAST) || defined(_WINDQUALITY_BETTER) || defined(_WINDQUALITY_BEST)
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float3 anchor = float3(data.texcoord1.zw, data.texcoord2.w);
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#ifdef _WINDQUALITY_BEST
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bool bBestWind = true;
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#else
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bool bBestWind = false;
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#endif
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float leafWindTrigOffset = anchor.x + anchor.y;
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windyPosition = LeafWind(bBestWind, leafTwo, windyPosition, data.normal, data.texcoord3.x, anchor, data.texcoord3.y, data.texcoord3.z, leafWindTrigOffset, rotatedWindVector);
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#endif
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}
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// frond wind
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bool bPalmWind = false;
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#ifdef _WINDQUALITY_PALM
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bPalmWind = true;
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if (geometryType == GEOM_TYPE_FROND)
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{
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windyPosition = RippleFrond(windyPosition, data.normal, data.texcoord.x, data.texcoord.y, data.texcoord3.x, data.texcoord3.y, data.texcoord3.z);
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}
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#endif
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// branch wind (applies to all 3D geometry)
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#if defined(_WINDQUALITY_BETTER) || defined(_WINDQUALITY_BEST) || defined(_WINDQUALITY_PALM)
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float3 rotatedBranchAnchor = normalize(mul(_ST_WindBranchAnchor.xyz, (float3x3)unity_ObjectToWorld)) * _ST_WindBranchAnchor.w;
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windyPosition = BranchWind(bPalmWind, windyPosition, treePos, float4(data.texcoord.zw, 0, 0), rotatedWindVector, rotatedBranchAnchor);
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#endif
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#endif // !EFFECT_BILLBOARD
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// global wind
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float globalWindTime = _ST_WindGlobal.x;
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#if defined(EFFECT_BILLBOARD) && defined(UNITY_INSTANCING_ENABLED)
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globalWindTime += UNITY_ACCESS_INSTANCED_PROP(STWind, _GlobalWindTime);
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#endif
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windyPosition = GlobalWind(windyPosition, treePos, true, rotatedWindVector, globalWindTime);
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data.vertex.xyz = windyPosition;
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#endif
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}
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///////////////////////////////////////////////////////////////////////
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// vertex program
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void SpeedTreeVert(inout appdata_full v)
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{
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// handle speedtree wind and lod
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OffsetSpeedTreeVertex(v, unity_LODFade.x);
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#if defined(CURVEDWORLD_IS_INSTALLED) && !defined(CURVEDWORLD_DISABLED_ON)
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#ifdef CURVEDWORLD_NORMAL_TRANSFORMATION_ON
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CURVEDWORLD_TRANSFORM_VERTEX_AND_NORMAL(v.vertex, v.normal, v.tangent)
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#else
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CURVEDWORLD_TRANSFORM_VERTEX(v.vertex)
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#endif
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#endif
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float3 treePos = float3(unity_ObjectToWorld[0].w, unity_ObjectToWorld[1].w, unity_ObjectToWorld[2].w);
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#if defined(EFFECT_BILLBOARD)
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BillboardSeamCrossfade(v, treePos);
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#endif
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// color already contains (ao, ao, ao, blend)
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// put hue variation amount in there
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#ifdef EFFECT_HUE_VARIATION
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float hueVariationAmount = frac(treePos.x + treePos.y + treePos.z);
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v.color.g = saturate(hueVariationAmount * _HueVariationColor.a);
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#endif
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}
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///////////////////////////////////////////////////////////////////////
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// lighting function to add subsurface
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half4 LightingSpeedTreeSubsurface(inout SurfaceOutputStandard s, half3 viewDir, UnityGI gi)
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{
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#ifdef EFFECT_SUBSURFACE
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half fSubsurfaceRough = 0.7 - s.Smoothness * 0.5;
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half fSubsurface = GGXTerm(clamp(-dot(gi.light.dir, viewDir), 0, 1), fSubsurfaceRough);
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// put modulated subsurface back into emission
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s.Emission *= (gi.indirect.diffuse * _SubsurfaceIndirect + gi.light.color * fSubsurface);
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#endif
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return LightingStandard(s, viewDir, gi);
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}
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void LightingSpeedTreeSubsurface_GI(inout SurfaceOutputStandard s, UnityGIInput data, inout UnityGI gi)
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{
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#ifdef EFFECT_BILLBOARD
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// fade off the shadows on billboards to avoid artifacts
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data.atten = lerp(data.atten, 1.0, _BillboardShadowFade);
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#endif
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LightingStandard_GI(s, data, gi);
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}
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half4 LightingSpeedTreeSubsurface_Deferred(SurfaceOutputStandard s, half3 viewDir, UnityGI gi, out half4 outGBuffer0, out half4 outGBuffer1, out half4 outGBuffer2)
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{
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// no light/shadow info in deferred, so stop subsurface
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s.Emission = half3(0,0,0);
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return LightingStandard_Deferred(s, viewDir, gi, outGBuffer0, outGBuffer1, outGBuffer2);
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}
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///////////////////////////////////////////////////////////////////////
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// surface shader
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void SpeedTreeSurf(Input IN, inout SurfaceOutputStandard OUT)
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{
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fixed4 color = tex2D(_MainTex, IN.uv_MainTex) * _Color;
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// transparency
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OUT.Alpha = color.a * IN.color.a;
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clip(OUT.Alpha - 0.3333);
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// color
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OUT.Albedo = color.rgb;
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// hue variation
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#ifdef EFFECT_HUE_VARIATION
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half3 shiftedColor = lerp(OUT.Albedo, _HueVariationColor.rgb, IN.color.g);
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// preserve vibrance
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half maxBase = max(OUT.Albedo.r, max(OUT.Albedo.g, OUT.Albedo.b));
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half newMaxBase = max(shiftedColor.r, max(shiftedColor.g, shiftedColor.b));
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maxBase /= newMaxBase;
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maxBase = maxBase * 0.5f + 0.5f;
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shiftedColor.rgb *= maxBase;
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OUT.Albedo = saturate(shiftedColor);
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#endif
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// normal
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#ifdef EFFECT_BUMP
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OUT.Normal = UnpackNormal(tex2D(_BumpMap, IN.uv_MainTex));
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#elif defined(EFFECT_BACKSIDE_NORMALS) || defined(EFFECT_BILLBOARD)
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OUT.Normal = float3(0, 0, 1);
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#endif
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// flip normal on backsides
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#ifdef EFFECT_BACKSIDE_NORMALS
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if (IN.facing < 0.5)
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{
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OUT.Normal.z = -OUT.Normal.z;
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}
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#endif
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// adjust billboard normals to improve GI and matching
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#ifdef EFFECT_BILLBOARD
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OUT.Normal.z *= 0.5;
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OUT.Normal = normalize(OUT.Normal);
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#endif
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// extra
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#ifdef EFFECT_EXTRA_TEX
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fixed4 extra = tex2D(_ExtraTex, IN.uv_MainTex);
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OUT.Smoothness = extra.r; // no slider is exposed when ExtraTex is not available, hence we skip the multiplication here
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OUT.Metallic = extra.g;
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OUT.Occlusion = extra.b * IN.color.r;
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#else
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OUT.Smoothness = _Glossiness;
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OUT.Metallic = _Metallic;
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OUT.Occlusion = IN.color.r;
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#endif
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// subsurface (hijack emissive)
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#ifdef EFFECT_SUBSURFACE
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OUT.Emission = tex2D(_SubsurfaceTex, IN.uv_MainTex) * _SubsurfaceColor;
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#endif
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}
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#endif // SPEEDTREE8_COMMON_INCLUDED
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