protected override sealed VFXExpression[] BuildExpression(VFXExpression[] inputExpression)
{
VFXExpression lineDelta = (inputExpression[1] - inputExpression[0]);
VFXExpression lineLength = new VFXExpressionMax(VFXOperatorUtility.Dot(lineDelta, lineDelta), VFXValue.Constant(Mathf.Epsilon));
VFXExpression t = VFXOperatorUtility.Dot(inputExpression[2] - inputExpression[0], lineDelta);
t = VFXOperatorUtility.Clamp(t / lineLength, VFXValue.Constant(0.0f), VFXValue.Constant(1.0f));
VFXExpression pointOnLine = (inputExpression[0] + VFXOperatorUtility.CastFloat(t, lineDelta.valueType) * lineDelta);
VFXExpression lineDistance = VFXOperatorUtility.Distance(inputExpression[2], pointOnLine);
return(new VFXExpression[] { pointOnLine, lineDistance });
}
protected override sealed VFXExpression[] BuildExpression(VFXExpression[] inputExpression)
{
// https://thebookofshaders.com/edit.php#05/cubicpulse.frag
// x0 = clamp(x, c - w, c + w)
// 1.0 - (abs(x0 - c) / w)^2 * (3.0 - 2.0 * abs(x0 - c) / w)
//first, clamp the input
var clamp_x = VFXOperatorUtility.Clamp(inputExpression[0], inputExpression[1] - inputExpression[2], inputExpression[1] + inputExpression[2]);
var a = new VFXExpressionAbs(clamp_x - inputExpression[1]) / inputExpression[2];
var b = new VFXValue <float>(3.0f) - new VFXExpressionMul(new VFXValue <float>(2.0f), a);
var res = new VFXValue <float>(1.0f) - a * a * b;
return(new[] { res });
}
protected override VFXExpression[] BuildExpression(VFXExpression[] inputExpression)
{
VFXExpression input;
if (Clamp)
{
input = VFXOperatorUtility.Clamp(inputExpression[0], inputExpression[1], inputExpression[2]);
}
else
{
input = inputExpression[0];
}
return(new[] { VFXOperatorUtility.Fit(input, inputExpression[1], inputExpression[2], inputExpression[3], inputExpression[4]) });
}
public void ProcessOperatorClamp()
{
var a = -1.5f;
var b = 0.2f;
var c = 0.3f;
var result = Mathf.Clamp(a, b, c);
var value_a = new VFXValue <float>(a);
var value_b = new VFXValue <float>(b);
var value_c = new VFXValue <float>(c);
var expression = VFXOperatorUtility.Clamp(value_a, value_b, value_c);
var context = new VFXExpression.Context(VFXExpressionContextOption.CPUEvaluation);
var resultExpression = context.Compile(expression);
Assert.AreEqual(result, resultExpression.Get <float>());
}
protected override VFXExpression[] BuildExpression(VFXExpression[] inputExpression)
{
VFXExpression clamped = VFXOperatorUtility.Clamp(inputExpression[0], inputExpression[1], inputExpression[2]);
return(new[] { VFXOperatorUtility.Fit(clamped, inputExpression[1], inputExpression[2], inputExpression[3], inputExpression[4]) });
}
protected override sealed VFXExpression[] BuildExpression(VFXExpression[] inputExpression)
{
return(new[] { VFXOperatorUtility.Clamp(inputExpression[0], inputExpression[1], inputExpression[2], false) });
}
