public void ProcessExpressionAbs()
{
var a = -1.5f;
var b = 0.0f;
var c = 0.2f;
var resultA = Mathf.Abs(a);
var resultB = Mathf.Abs(b);
var resultC = Mathf.Abs(c);
var value_a = new VFXValue <float>(a);
var value_b = new VFXValue <float>(b);
var value_c = new VFXValue <float>(c);
var absExpressionA = new VFXExpressionAbs(value_a);
var absExpressionB = new VFXExpressionAbs(value_b);
var absExpressionC = new VFXExpressionAbs(value_c);
var context = new VFXExpression.Context(VFXExpressionContextOption.CPUEvaluation);
var expressionA = context.Compile(absExpressionA);
var expressionB = context.Compile(absExpressionB);
var expressionC = context.Compile(absExpressionC);
Assert.AreEqual(resultA, expressionA.Get <float>());
Assert.AreEqual(resultB, expressionB.Get <float>());
Assert.AreEqual(resultC, expressionC.Get <float>());
}
protected override sealed VFXExpression[] BuildExpression(VFXExpression[] inputExpression)
{
// abs(frac(x*F))
var res = new VFXExpressionAbs(VFXOperatorUtility.Frac(inputExpression[0] * inputExpression[1]));
return(new[] { VFXOperatorUtility.Lerp(inputExpression[2], inputExpression[3], res) });
}
public void ProcessOperatorAbsInt([ValueSource("ProcessOperatorAbsInt_a")] int a)
{
var r = Mathf.Abs(a);
var value_a = new VFXValue <int>(a);
var expression = new VFXExpressionAbs(value_a);
var context = new VFXExpression.Context(VFXExpressionContextOption.CPUEvaluation);
var resultExpression = context.Compile(expression);
Assert.AreEqual(r, resultExpression.Get <int>());
}
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 });
}
