Function GatherInputs

shadercompiler/EffectCompilerMetal.cpp:2333–2375

Given a function header, gathers all inputs for [[stage_in]] into a flat structure

// Given a function header, gathers all inputs for [[stage_in]] into a flat structure
void GatherInputs( ASTNode* destStruct, std::vector<ASTNode*>& accessors, const std::vector<Symbol*>& params, ASTNode* header, ParserState& state )
{
	for( size_t i = 0; i < header->GetChildrenCount(); ++i )
	{
		auto arg = header->GetChild( i );

		if( IsUniformInputArgument( arg ) || arg->GetSymbol()->addressSpace != AddressSpace::None )
		{
			continue;
		}
		bool isIn = arg->GetToken() == 0 || arg->GetToken()->type == OP_IN;
		if( !isIn )
		{
			continue;
		}

		Symbol* symbol = arg->GetSymbol();
		if( !symbol )
		{
			continue;
		}

		if( HasSystemRegister( symbol ) )
		{
			continue;
		}

		if( !params[i] )
		{
			continue;
		}

		if( symbol->type.IsStruct() )
		{
			GatherFields( destStruct, accessors, NewVarIdentifier( state, params[i] ), symbol->type.symbol->definition, state );
		}
		else if( symbol->type.IsScalarOrVector() )
		{
			destStruct->AddChild( NewStructMember( state, symbol ) );
			accessors.push_back( NewVarIdentifier( state, params[i] ) );
		}
	}
}

void GatherSystemInputs( ASTNode* destStruct, std::vector<ASTNode*>& accessors, std::vector<ASTNode*>& argumentAccessors, const std::vector<Symbol*>& params, ASTNode* header, ASTNode* shaderBody, ParserState& state )
{