public void PreEmitExpImpl(
MidIfExp exp,
Span span)
{
PreEmitExp(exp.Condition, span);
PreEmitExp(exp.Then, span);
PreEmitExp(exp.Else, span);
}
private EmitValHLSL EmitExpImpl(MidIfExp exp, Span span)
{
var condition = EmitExp(exp.Condition, span);
bool isVoid = exp.Type is MidVoidType;
ITypeHLSL expType = VoidVal.Type;
EmitValHLSL temp = VoidVal;
if (!isVoid)
{
expType = EmitType(exp.Type);
temp = expType.CreateVal(
_shared.GenerateName("_if"));
DeclareLocal(temp, span);
}
span.WriteLine("if ({0})", condition);
span.WriteLine("{");
var thenVal = EmitExp(exp.Then, span.IndentSpan());
if (!isVoid)
{
Assign(temp, thenVal, span.IndentSpan());
}
span.WriteLine("}");
span.WriteLine("else");
span.WriteLine("{");
var elseVal = EmitExp(exp.Else, span.IndentSpan());
if (!isVoid)
{
Assign(temp, elseVal, span.IndentSpan());
}
span.WriteLine("}");
return temp;
}
private void TransformChildrenImpl(
MidIfExp exp)
{
exp.Condition = Transform(exp.Condition);
exp.Then = Transform(exp.Then);
exp.Else = Transform(exp.Else);
}