/// <summary>
/// Replace the append methods
/// </summary>
/// <param name="entryPoint">the entrypoint method</param>
/// <param name="replacor">the visitor</param>
private void ReplaceAppendMethod(MethodDefinition entryPoint, XenkoReplaceAppend replacor)
{
replacor.Run(entryPoint);
List<StreamUsageInfo> nextMethods;
if (streamsUsages.TryGetValue(entryPoint, out nextMethods))
nextMethods.Where(x => x.CallType == StreamCallType.Method).Select(x => x.MethodDeclaration as MethodDefinition).Where(x => x != null).ToList().ForEach(x => ReplaceAppendMethod(x, replacor));
}
/// <summary>
/// Generates a stream structure and add them to the Ast - for the geometry shader
/// </summary>
/// <param name="entryPoint">the entrypoint function</param>
/// <param name="streamStageUsage">the stream usage in this stage</param>
/// <param name="stageName">the name of the stage</param>
/// <param name="prevOuputStructure">the output structutre from the previous stage</param>
/// <returns>the new output structure</returns>
private StructType GenerateStreamsWithSpecialDataInput(MethodDefinition entryPoint, StreamStageUsage streamStageUsage, string stageName, StructType prevOuputStructure)
{
if (entryPoint != null)
{
var inStreamStruct = prevOuputStructure ?? CreateStreamStructure(streamStageUsage.InStreamList, stageName + "_INPUT");
var outStreamStruct = CreateStreamStructure(streamStageUsage.OutStreamList, stageName + "_OUTPUT");
var mixin = entryPoint.GetTag(XenkoTags.ShaderScope) as ModuleMixin;
var intermediateStreamStruct = CreateIntermediateStructType(streamStageUsage, stageName);
// put the streams declaration at the beginning of the method body
var streamsDeclaration = new DeclarationStatement(new Variable(new TypeName(intermediateStreamStruct.Name), "streams") { InitialValue = new CastExpression { From = new LiteralExpression(0), Target = new TypeName(intermediateStreamStruct.Name) } });
entryPoint.Body.Insert(0, streamsDeclaration);
// add the declaration statements to the entrypoint and fill with the values
var outputStatements = CreateOutputFromStream(outStreamStruct, "output", intermediateStreamStruct, "streams").ToList();
var outputVre = new VariableReferenceExpression(((outputStatements.First() as DeclarationStatement).Content as Variable).Name);
var replacor = new XenkoReplaceAppend(streamAnalyzer.AppendMethodCalls, outputStatements, outputVre);
ReplaceAppendMethod(entryPoint, replacor);
var visitedMethods = new Stack<MethodDeclaration>();
var inStructType = new TypeName(inStreamStruct.Name);
var outStructType = new TypeName(outStreamStruct.Name);
RecursiveRename(entryPoint, inStructType, null, outStructType, null, visitedMethods);
// explore all the called functions
var streamsVisitedMethods = new HashSet<MethodDeclaration>();
var methodsWithStreams = new List<MethodDeclaration>();
PropagateStreamsParameter(entryPoint, inStreamStruct, intermediateStreamStruct, outStreamStruct, streamsVisitedMethods, methodsWithStreams);
CheckCrossStageMethodCall(streamStageUsage.ShaderStage, methodsWithStreams);
if (prevOuputStructure == null)
shader.Members.Insert(0, inStreamStruct);
shader.Members.Insert(0, outStreamStruct);
shader.Members.Insert(0, intermediateStreamStruct);
return outStreamStruct;
}
return prevOuputStructure;
}