Bilinear Interpolation

Linearly interpolates between four input values based on input coordinates

Inputs

Name	Description
Alpha	Usually frac(Position)
X0Y0	Value at X=0 Y=0
X1Y0	Value at X=1 Y=0
X0Y1	Value at X=0 Y=1
X1Y1	Value at X=1 Y=1

Outputs

Name	Description
Return Value	Interpolated value