bool TryProcessFunctionCall(ref Expression e, Function f, Expression[] args, Expression optionalValueOrObject = null, Expression optionalObject = null)
{
// Special case for T[].get_Length()
if (f.DeclaringType.IsRefArray &&
optionalValueOrObject != null && optionalValueOrObject.ReturnType.IsFixedArray &&
f.Name == "get_Length" && f.Parameters.Length == 0)
{
var fat = (FixedArrayType)optionalValueOrObject.ReturnType;
e = fat.OptionalSize ?? Expression.Invalid;
return(true);
}
if (Backend.ShaderBackend.IsIntrinsic(f))
{
return(false);
}
var processedArgs = ProcessArguments(args, optionalValueOrObject, optionalObject);
ShaderFunction result;
if (!ProcessedFunctions.TryGetValue(f, out result))
{
// TODO: This code doesn't handle:
// - Recursion
// - Multiple uses of function with array in parameterlist
if (!f.HasBody)
{
Log.Error(e.Source, ErrorCode.E5010, f.Quote() + " is pure intrinsic and is not supported by current shader backend (in " + Generator.Path.Quote() + ")");
return(false);
}
result = new ShaderFunction(f.Source, Shader, f.UnoName.ToIdentifier() + "_" + Generator.ShaderGlobalCounter++, f.ReturnType, null);
var state = new CopyState(result);
var parameterList = TryProcessParameterList(f, processedArgs, state);
if (parameterList == null)
{
return(false);
}
result.SetParameters(parameterList);
result.SetBody(f.Body.CopyNullable(state));
if (!f.IsStatic)
{
if (f.IsConstructor)
{
result.ReturnType = f.DeclaringType;
var var = new Variable(f.Source, f, "__this", f.DeclaringType);
result.Body.Statements.Insert(0, new VariableDeclaration(var));
result.Body.Statements.Add(new Return(f.Source, new This(f.Source, f.DeclaringType)));
result.Body.Visit(new ThisSwapper(this, new LoadLocal(f.Source, var)));
}
else
{
result.Body.Visit(new ThisSwapper(this, new LoadArgument(f.Source, result, f.Parameters.Length)));
}
}
ProcessedFunctions.Add(f, result);
result.Visit(this);
Shader.Functions.Add(result); // add after process
}
e = new CallShader(e.Source, result, processedArgs);
return(true);
}
public virtual void WriteCallShader(CallShader s, ExpressionUsage u)
{
Write(s.Function.Name);
WriteArguments(s.Function, s.Arguments, true);
}