Justin Marshall
40 lines
1.3 KiB
C++
40 lines
1.3 KiB
C++
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/*
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==================================================================================
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CALC_POSITION_AUTOSPRITE1
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==================================================================================
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*/
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#template CALC_POSITION_AUTOSPRITE1( resultPosition, midpoint, viewLeft, viewUp, tangent )
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{
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// Normals and tangents are stored as unsigned bytes - need to expand back to [-1,1] range
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float3 parms = tangent;
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parms.yz = parms.yz * 2.0 - 1.0;
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float radius = parms.x * 255.0;
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float signLeft = parms.y;
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float signUp = parms.z;
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float3 scaledLeft = normalize( viewLeft ) * radius;
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float3 scaledUp = normalize( viewUp ) * radius;
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resultPosition = ( midpoint + ( signLeft * scaledLeft ) + ( signUp * scaledUp ) );
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}
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#endtemplate
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/*
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==================================================================================
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CALC_POSITION_AUTOSPRITE1
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==================================================================================
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*/
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#template CALC_POSITION_AUTOSPRITE2( resultPosition, viewOrg, midpoint, majorAxis, sign, edgeLen )
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{
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// Normals and tangents are stored as unsigned bytes - need to expand back to [-1,1] range
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float s = sign * 2.0 - 1.0;
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float3 axis = majorAxis * 2.0 - 1.0;
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float len = edgeLen * 255.0 * s;
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float3 dir = normalize( midpoint - viewOrg );
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float3 minor = cross( axis, dir );
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resultPosition = ( midpoint + len * minor );
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}
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#endtemplate
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