44 lines
1.4 KiB
HLSL
44 lines
1.4 KiB
HLSL
// Unity built-in shader source. Copyright (c) 2023 Unity Technologies. MIT license (see license.txt)
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#ifndef SPEEDTREE_COMMON_INCLUDED
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#define SPEEDTREE_COMMON_INCLUDED
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#define ST_GEOM_TYPE_BRANCH 0
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#define ST_GEOM_TYPE_FROND 1
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#define ST_GEOM_TYPE_LEAF 2
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#define ST_GEOM_TYPE_FACINGLEAF 3
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// @uv2 packs the object space position of the next LOD
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float3 ApplySmoothLODTransition(float3 ObjectSpacePosition, float3 uv2)
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{
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return lerp(ObjectSpacePosition, uv2, unity_LODFade.x);
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}
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float3 DoLeafFacing(float3 vPos, float4 vTexcoord1, float4 vTexcoord2)
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{
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float3 anchor = float3(vTexcoord1.zw, vTexcoord2.w);
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float3 facingPosition = vPos - anchor;
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// face camera-facing leaf to camera
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float offsetLen = length(facingPosition);
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facingPosition = float3(facingPosition.x, -facingPosition.z, facingPosition.y);
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float4x4 itmv = transpose(mul(UNITY_MATRIX_I_M, UNITY_MATRIX_I_V));
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facingPosition = mul(facingPosition.xyz, (float3x3)itmv);
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facingPosition = normalize(facingPosition) * offsetLen; // make sure the offset vector is still scaled
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return facingPosition + anchor;
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}
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int GetGeometryType(float4 uv3, out bool bLeafTwo)
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{
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int geometryType = (int)(uv3.w + 0.25);
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bLeafTwo = geometryType > ST_GEOM_TYPE_FACINGLEAF;
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if (bLeafTwo)
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{
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geometryType -= 2;
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}
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return geometryType;
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}
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#endif // SPEEDTREE_COMMON_INCLUDED
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