112 lines
3.8 KiB
HLSL
112 lines
3.8 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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#ifndef SPEEDTREE_BILLBOARD_COMMON_INCLUDED
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#define SPEEDTREE_BILLBOARD_COMMON_INCLUDED
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#define SPEEDTREE_ALPHATEST
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fixed _Cutoff;
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#include "SpeedTreeCommon.cginc"
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CBUFFER_START(UnityBillboardPerCamera)
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float3 unity_BillboardNormal;
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float3 unity_BillboardTangent;
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float4 unity_BillboardCameraParams;
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#define unity_BillboardCameraPosition (unity_BillboardCameraParams.xyz)
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#define unity_BillboardCameraXZAngle (unity_BillboardCameraParams.w)
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CBUFFER_END
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CBUFFER_START(UnityBillboardPerBatch)
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float4 unity_BillboardInfo; // x: num of billboard slices; y: 1.0f / (delta angle between slices)
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float4 unity_BillboardSize; // x: width; y: height; z: bottom
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float4 unity_BillboardImageTexCoords[16];
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CBUFFER_END
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struct SpeedTreeBillboardData
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{
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float4 vertex : POSITION;
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float2 texcoord : TEXCOORD0;
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float4 texcoord1 : TEXCOORD1;
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float3 normal : NORMAL;
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float4 tangent : TANGENT;
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float4 color : COLOR;
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UNITY_VERTEX_INPUT_INSTANCE_ID
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};
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void SpeedTreeBillboardVert(inout SpeedTreeBillboardData IN, out Input OUT)
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{
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UNITY_INITIALIZE_OUTPUT(Input, OUT);
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// assume no scaling & rotation
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float3 worldPos = IN.vertex.xyz + float3(unity_ObjectToWorld[0].w, unity_ObjectToWorld[1].w, unity_ObjectToWorld[2].w);
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#ifdef BILLBOARD_FACE_CAMERA_POS
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float3 eyeVec = normalize(unity_BillboardCameraPosition - worldPos);
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float3 billboardTangent = normalize(float3(-eyeVec.z, 0, eyeVec.x)); // cross(eyeVec, {0,1,0})
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float3 billboardNormal = float3(billboardTangent.z, 0, -billboardTangent.x); // cross({0,1,0},billboardTangent)
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float3 angle = atan2(billboardNormal.z, billboardNormal.x); // signed angle between billboardNormal to {0,0,1}
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angle += angle < 0 ? 2 * UNITY_PI : 0;
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#else
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float3 billboardTangent = unity_BillboardTangent;
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float3 billboardNormal = unity_BillboardNormal;
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float angle = unity_BillboardCameraXZAngle;
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#endif
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float widthScale = IN.texcoord1.x;
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float heightScale = IN.texcoord1.y;
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float rotation = IN.texcoord1.z;
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float2 percent = IN.texcoord.xy;
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float3 billboardPos = (percent.x - 0.5f) * unity_BillboardSize.x * widthScale * billboardTangent;
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billboardPos.y += (percent.y * unity_BillboardSize.y + unity_BillboardSize.z) * heightScale;
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#ifdef ENABLE_WIND
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float windEnabled = dot(_ST_WindVector.xyz, _ST_WindVector.xyz);
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if (_WindQuality * windEnabled)
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billboardPos = GlobalWind(billboardPos, worldPos, true, _ST_WindVector.xyz, IN.texcoord1.w);
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#endif
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IN.vertex.xyz += billboardPos;
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IN.vertex.w = 1.0f;
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IN.normal = billboardNormal.xyz;
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IN.tangent = float4(billboardTangent.xyz,-1);
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float slices = unity_BillboardInfo.x;
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float invDelta = unity_BillboardInfo.y;
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angle += rotation;
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float imageIndex = fmod(floor(angle * invDelta + 0.5f), slices);
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float4 imageTexCoords = unity_BillboardImageTexCoords[imageIndex];
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if (imageTexCoords.w < 0)
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{
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OUT.mainTexUV = imageTexCoords.xy - imageTexCoords.zw * percent.yx;
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}
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else
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{
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OUT.mainTexUV = imageTexCoords.xy + imageTexCoords.zw * percent;
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}
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OUT.color = _Color;
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#ifdef EFFECT_HUE_VARIATION
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float hueVariationAmount = frac(worldPos.x + worldPos.y + worldPos.z);
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OUT.HueVariationAmount = saturate(hueVariationAmount * _HueVariation.a);
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#endif
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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(IN.vertex, IN.normal, IN.tangent)
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#else
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CURVEDWORLD_TRANSFORM_VERTEX(IN.vertex)
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#endif
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#endif
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}
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#endif // SPEEDTREE_BILLBOARD_COMMON_INCLUDED
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