X-Git-Url: http://git.tdb.fi/?p=libs%2Fgl.git;a=blobdiff_plain;f=source%2Fprogramcompiler.cpp;h=c35fa275c2b1bbadbcfbfb8f113cf68d165d4a8a;hp=9b3266755b0b4f36c7bdc1ebe3471ebba48e8d40;hb=6dc2da27f0831d4172fcfeba4900616fd6c844b8;hpb=ba97b71564cadd322fe1bf3d8afe556b38ef0647

diff --git a/source/programcompiler.cpp b/source/programcompiler.cpp
index 9b326675..c35fa275 100644
--- a/source/programcompiler.cpp
+++ b/source/programcompiler.cpp
@@ -58,21 +58,23 @@ void ProgramCompiler::add_shaders(Program &program)
 	if(!module)
 		throw invalid_operation("ProgramCompiler::add_shaders");
 
-	string head = "#version 150\n";
 	for(list<Stage>::iterator i=module->stages.begin(); i!=module->stages.end(); ++i)
 	{
 		if(i->type==VERTEX)
-			program.attach_shader_owned(new VertexShader(head+apply<Formatter>(*i)));
+		{
+			program.attach_shader_owned(new VertexShader(apply<Formatter>(*i)));
+			for(map<string, unsigned>::iterator j=i->locations.begin(); j!=i->locations.end(); ++j)
+				program.bind_attribute(j->second, j->first);
+		}
 		else if(i->type==GEOMETRY)
-			program.attach_shader_owned(new GeometryShader(head+apply<Formatter>(*i)));
+			program.attach_shader_owned(new GeometryShader(apply<Formatter>(*i)));
 		else if(i->type==FRAGMENT)
-			program.attach_shader_owned(new FragmentShader(head+apply<Formatter>(*i)));
+		{
+			program.attach_shader_owned(new FragmentShader(apply<Formatter>(*i)));
+			for(map<string, unsigned>::iterator j=i->locations.begin(); j!=i->locations.end(); ++j)
+				program.bind_fragment_data(j->second, j->first);
+		}
 	}
-
-	program.bind_attribute(VERTEX4, "vertex");
-	program.bind_attribute(NORMAL3, "normal");
-	program.bind_attribute(COLOR4_FLOAT, "color");
-	program.bind_attribute(TEXCOORD4, "texcoord");
 }
 
 Module *ProgramCompiler::create_builtins_module()
@@ -120,13 +122,14 @@ void ProgramCompiler::process()
 		else
 			++i;
 	}
+	for(list<Stage>::iterator i=module->stages.begin(); i!=module->stages.end(); ++i)
+		finalize(*i);
 }
 
 void ProgramCompiler::import(const string &name)
 {
-	if(!resources)
-		throw runtime_error("no resources");
-	RefPtr<IO::Seekable> io = resources->open_raw(name+".glsl");
+	string fn = name+".glsl";
+	RefPtr<IO::Seekable> io = (resources ? resources->open_raw(fn) : Resources::get_builtins().open(fn));
 	if(!io)
 		throw runtime_error(format("module %s not found", name));
 	ProgramParser import_parser;
@@ -159,27 +162,43 @@ void ProgramCompiler::generate(Stage &stage)
 {
 	inject_block(stage.content, module->shared.content);
 
+	apply<DeclarationReorderer>(stage);
+	apply<FunctionResolver>(stage);
 	apply<VariableResolver>(stage);
 	apply<InterfaceGenerator>(stage);
 	apply<VariableResolver>(stage);
 	apply<VariableRenamer>(stage);
+	apply<DeclarationReorderer>(stage);
+	apply<LegacyConverter>(stage);
 }
 
 bool ProgramCompiler::optimize(Stage &stage)
 {
 	apply<ConstantConditionEliminator>(stage);
-	apply<VariableResolver>(stage);
+
+	set<FunctionDeclaration *> inlineable = apply<InlineableFunctionLocator>(stage);
+	apply<FunctionInliner>(stage, inlineable);
 
 	set<Node *> unused = apply<UnusedVariableLocator>(stage);
+	set<Node *> unused2 = apply<UnusedFunctionLocator>(stage);
+	unused.insert(unused2.begin(), unused2.end());
 	apply<NodeRemover>(stage, unused);
 
 	return !unused.empty();
 }
 
+void ProgramCompiler::finalize(Stage &stage)
+{
+	if(get_gl_api()==OPENGL_ES2)
+		apply<DefaultPrecisionGenerator>(stage);
+	else
+		apply<PrecisionRemover>(stage);
+}
+
 void ProgramCompiler::inject_block(Block &target, const Block &source)
 {
-	list<NodePtr<Node> >::iterator insert_point = target.body.begin();
-	for(list<NodePtr<Node> >::const_iterator i=source.body.begin(); i!=source.body.end(); ++i)
+	list<RefPtr<Node> >::iterator insert_point = target.body.begin();
+	for(list<RefPtr<Node> >::const_iterator i=source.body.begin(); i!=source.body.end(); ++i)
 		target.body.insert(insert_point, (*i)->clone());
 }
 
@@ -211,12 +230,60 @@ void ProgramCompiler::Visitor::apply(Stage &s)
 }
 
 
+ProgramCompiler::BlockModifier::BlockModifier():
+	remove_node(false)
+{ }
+
+void ProgramCompiler::BlockModifier::flatten_block(Block &block)
+{
+	insert_nodes.insert(insert_nodes.end(), block.body.begin(), block.body.end());
+	remove_node = true;
+}
+
+void ProgramCompiler::BlockModifier::apply_and_increment(Block &block, list<RefPtr<Node> >::iterator &i)
+{
+	block.body.insert(i, insert_nodes.begin(), insert_nodes.end());
+	insert_nodes.clear();
+
+	if(remove_node)
+		block.body.erase(i++);
+	else
+		++i;
+	remove_node = false;
+}
+
+void ProgramCompiler::BlockModifier::visit(Block &block)
+{
+	for(list<RefPtr<Node> >::iterator i=block.body.begin(); i!=block.body.end(); )
+	{
+		(*i)->visit(*this);
+		apply_and_increment(block, i);
+	}
+}
+
+
 ProgramCompiler::Formatter::Formatter():
 	indent(0),
 	parameter_list(false),
 	else_if(0)
 { }
 
+void ProgramCompiler::Formatter::apply(ProgramSyntax::Stage &s)
+{
+	GLApi api = get_gl_api();
+	const Version &ver = s.required_version;
+
+	if(ver)
+	{
+		formatted += format("#version %d%02d", ver.major, ver.minor);
+		if(api==OPENGL_ES2 && ver>=Version(3, 0))
+			formatted += " es";
+		formatted += '\n';
+	}
+
+	Visitor::apply(s);
+}
+
 void ProgramCompiler::Formatter::visit(Literal &literal)
 {
 	formatted += literal.token;
@@ -267,7 +334,7 @@ void ProgramCompiler::Formatter::visit(Assignment &assign)
 void ProgramCompiler::Formatter::visit(FunctionCall &call)
 {
 	formatted += format("%s(", call.name);
-	for(vector<NodePtr<Expression> >::iterator i=call.arguments.begin(); i!=call.arguments.end(); ++i)
+	for(vector<RefPtr<Expression> >::iterator i=call.arguments.begin(); i!=call.arguments.end(); ++i)
 	{
 		if(i!=call.arguments.begin())
 			formatted += ", ";
@@ -292,9 +359,9 @@ void ProgramCompiler::Formatter::visit(Block &block)
 	if(use_braces)
 		formatted += format("%s{\n", string(brace_indent*2, ' '));
 
-	SetForScope<unsigned> set(indent, indent+!formatted.empty());
+	SetForScope<unsigned> set(indent, indent+(indent>0 || use_braces));
 	string spaces(indent*2, ' ');
-	for(list<NodePtr<Node> >::iterator i=block.body.begin(); i!=block.body.end(); ++i)
+	for(list<RefPtr<Node> >::iterator i=block.body.begin(); i!=block.body.end(); ++i)
 	{
 		if(i!=block.body.begin())
 			formatted += '\n';
@@ -312,6 +379,11 @@ void ProgramCompiler::Formatter::visit(Import &import)
 	formatted += format("import %s;", import.module);
 }
 
+void ProgramCompiler::Formatter::visit(Precision &prec)
+{
+	formatted += format("precision %s %s;", prec.precision, prec.type);
+}
+
 void ProgramCompiler::Formatter::visit(Layout &layout)
 {
 	formatted += "layout(";
@@ -323,7 +395,13 @@ void ProgramCompiler::Formatter::visit(Layout &layout)
 		if(!i->value.empty())
 			formatted += format("=%s", i->value);
 	}
-	formatted += format(") %s;", layout.interface);
+	formatted += ')';
+}
+
+void ProgramCompiler::Formatter::visit(InterfaceLayout &layout)
+{
+	layout.layout.visit(*this);
+	formatted += format(" %s;", layout.interface);
 }
 
 void ProgramCompiler::Formatter::visit(StructDeclaration &strct)
@@ -335,12 +413,29 @@ void ProgramCompiler::Formatter::visit(StructDeclaration &strct)
 
 void ProgramCompiler::Formatter::visit(VariableDeclaration &var)
 {
+	if(var.layout)
+	{
+		var.layout->visit(*this);
+		formatted += ' ';
+	}
 	if(var.constant)
 		formatted += "const ";
 	if(!var.sampling.empty())
 		formatted += format("%s ", var.sampling);
 	if(!var.interface.empty() && var.interface!=block_interface)
-		formatted += format("%s ", var.interface);
+	{
+		string interface = var.interface;
+		if(stage->required_version<Version(1, 30))
+		{
+			if(stage->type==VERTEX && var.interface=="in")
+				interface = "attribute";
+			else if((stage->type==VERTEX && var.interface=="out") || (stage->type==FRAGMENT && var.interface=="in"))
+				interface = "varying";
+		}
+		formatted += format("%s ", interface);
+	}
+	if(!var.precision.empty())
+		formatted += format("%s ", var.precision);
 	formatted += format("%s %s", var.type, var.name);
 	if(var.array)
 	{
@@ -369,7 +464,7 @@ void ProgramCompiler::Formatter::visit(InterfaceBlock &iface)
 void ProgramCompiler::Formatter::visit(FunctionDeclaration &func)
 {
 	formatted += format("%s %s(", func.return_type, func.name);
-	for(vector<NodePtr<VariableDeclaration> >::iterator i=func.parameters.begin(); i!=func.parameters.end(); ++i)
+	for(vector<RefPtr<VariableDeclaration> >::iterator i=func.parameters.begin(); i!=func.parameters.end(); ++i)
 	{
 		if(i!=func.parameters.begin())
 			formatted += ", ";
@@ -425,10 +520,15 @@ void ProgramCompiler::Formatter::visit(Return &ret)
 	formatted += ';';
 }
 
+void ProgramCompiler::Formatter::visit(Jump &jump)
+{
+	formatted += jump.keyword;
+	formatted += ';';
+}
+
 
 ProgramCompiler::DeclarationCombiner::DeclarationCombiner():
-	toplevel(true),
-	remove_node(false)
+	toplevel(true)
 { }
 
 void ProgramCompiler::DeclarationCombiner::visit(Block &block)
@@ -437,15 +537,7 @@ void ProgramCompiler::DeclarationCombiner::visit(Block &block)
 		return;
 
 	SetForScope<bool> set(toplevel, false);
-	for(list<NodePtr<Node> >::iterator i=block.body.begin(); i!=block.body.end(); )
-	{
-		remove_node = false;
-		(*i)->visit(*this);
-		if(remove_node)
-			block.body.erase(i++);
-		else
-			++i;
-	}
+	BlockModifier::visit(block);
 }
 
 void ProgramCompiler::DeclarationCombiner::visit(FunctionDeclaration &func)
@@ -467,6 +559,7 @@ void ProgramCompiler::DeclarationCombiner::visit(VariableDeclaration &var)
 	VariableDeclaration *&ptr = variables[var.name];
 	if(ptr)
 	{
+		ptr->type = var.type;
 		if(var.init_expression)
 			ptr->init_expression = var.init_expression;
 		remove_node = true;
@@ -616,9 +709,36 @@ void ProgramCompiler::VariableResolver::visit(InterfaceBlock &iface)
 }
 
 
+void ProgramCompiler::FunctionResolver::visit(FunctionCall &call)
+{
+	map<string, vector<FunctionDeclaration *> >::iterator i = functions.find(call.name);
+	if(i!=functions.end())
+		call.declaration = i->second.back();
+
+	TraversingVisitor::visit(call);
+}
+
+void ProgramCompiler::FunctionResolver::visit(FunctionDeclaration &func)
+{
+	vector<FunctionDeclaration *> &decls = functions[func.name];
+	if(func.definition)
+	{
+		for(vector<FunctionDeclaration *>::iterator i=decls.begin(); i!=decls.end(); ++i)
+			(*i)->definition = func.definition;
+		decls.clear();
+		decls.push_back(&func);
+	}
+	else if(!decls.empty() && decls.back()->definition)
+		func.definition = decls.back()->definition;
+	else
+		decls.push_back(&func);
+
+	TraversingVisitor::visit(func);
+}
+
+
 ProgramCompiler::InterfaceGenerator::InterfaceGenerator():
-	scope_level(0),
-	remove_node(false)
+	scope_level(0)
 { }
 
 string ProgramCompiler::InterfaceGenerator::get_out_prefix(StageType type)
@@ -643,29 +763,21 @@ void ProgramCompiler::InterfaceGenerator::apply(Stage &s)
 void ProgramCompiler::InterfaceGenerator::visit(Block &block)
 {
 	SetForScope<unsigned> set(scope_level, scope_level+1);
-	for(list<NodePtr<Node> >::iterator i=block.body.begin(); i!=block.body.end(); )
+	for(list<RefPtr<Node> >::iterator i=block.body.begin(); i!=block.body.end(); )
 	{
 		(*i)->visit(*this);
 
 		if(scope_level==1)
 		{
-			for(map<string, VariableDeclaration *>::iterator j=iface_declarations.begin(); j!=iface_declarations.end(); ++j)
+			for(map<string, RefPtr<VariableDeclaration> >::iterator j=iface_declarations.begin(); j!=iface_declarations.end(); ++j)
 			{
-				list<NodePtr<Node> >::iterator k = block.body.insert(i, j->second);
+				list<RefPtr<Node> >::iterator k = block.body.insert(i, j->second);
 				(*k)->visit(*this);
 			}
 			iface_declarations.clear();
 		}
 
-		for(list<Node *>::iterator j=insert_nodes.begin(); j!=insert_nodes.end(); ++j)
-			block.body.insert(i, *j);
-		insert_nodes.clear();
-
-		if(remove_node)
-			block.body.erase(i++);
-		else
-			++i;
-		remove_node = false;
+		apply_and_increment(block, i);
 	}
 }
 
@@ -768,9 +880,9 @@ void ProgramCompiler::InterfaceGenerator::visit(Passthrough &pass)
 
 	for(map<string, VariableDeclaration *>::const_iterator i=stage->in_variables.begin(); i!=stage->in_variables.end(); ++i)
 		pass_vars.push_back(i->second);
-	for(map<string, VariableDeclaration *>::const_iterator i=iface_declarations.begin(); i!=iface_declarations.end(); ++i)
+	for(map<string, RefPtr<VariableDeclaration> >::const_iterator i=iface_declarations.begin(); i!=iface_declarations.end(); ++i)
 		if(i->second->interface=="in")
-			pass_vars.push_back(i->second);
+			pass_vars.push_back(i->second.get());
 
 	if(stage->previous)
 	{
@@ -842,6 +954,147 @@ void ProgramCompiler::VariableRenamer::visit(VariableDeclaration &var)
 }
 
 
+ProgramCompiler::DeclarationReorderer::DeclarationReorderer():
+	kind(NO_DECLARATION)
+{ }
+
+void ProgramCompiler::DeclarationReorderer::visit(Block &block)
+{
+	list<RefPtr<Node> >::iterator struct_insert_point = block.body.end();
+	list<RefPtr<Node> >::iterator variable_insert_point = block.body.end();
+
+	for(list<RefPtr<Node> >::iterator i=block.body.begin(); i!=block.body.end(); )
+	{
+		kind = NO_DECLARATION;
+		(*i)->visit(*this);
+
+		bool moved = false;
+		if(kind==STRUCT && struct_insert_point!=block.body.end())
+		{
+			block.body.insert(struct_insert_point, *i);
+			moved = true;
+		}
+		else if(kind>STRUCT && struct_insert_point==block.body.end())
+			struct_insert_point = i;
+
+		if(kind==VARIABLE && variable_insert_point!=block.body.end())
+		{
+			block.body.insert(variable_insert_point, *i);
+			moved = true;
+		}
+		else if(kind>VARIABLE && variable_insert_point==block.body.end())
+			variable_insert_point = i;
+
+		if(moved)
+			block.body.erase(i++);
+		else
+			++i;
+	}
+}
+
+
+ProgramCompiler::InlineableFunctionLocator::InlineableFunctionLocator():
+	in_function(0)
+{ }
+
+void ProgramCompiler::InlineableFunctionLocator::visit(FunctionCall &call)
+{
+	FunctionDeclaration *def = call.declaration;
+	if(def && def->definition!=def)
+		def = def->definition;
+
+	if(def)
+	{
+		unsigned &count = refcounts[def];
+		++count;
+		if(count>1 || def==in_function)
+			inlineable.erase(def);
+	}
+
+	TraversingVisitor::visit(call);
+}
+
+void ProgramCompiler::InlineableFunctionLocator::visit(FunctionDeclaration &func)
+{
+	unsigned &count = refcounts[func.definition];
+	if(!count && func.parameters.empty())
+		inlineable.insert(func.definition);
+
+	SetForScope<FunctionDeclaration *> set(in_function, &func);
+	TraversingVisitor::visit(func);
+}
+
+
+ProgramCompiler::FunctionInliner::FunctionInliner():
+	extract_result(0)
+{ }
+
+ProgramCompiler::FunctionInliner::FunctionInliner(const set<FunctionDeclaration *> &in):
+	inlineable(in),
+	extract_result(0)
+{ }
+
+void ProgramCompiler::FunctionInliner::visit_and_inline(RefPtr<Expression> &ptr)
+{
+	inline_result = 0;
+	ptr->visit(*this);
+	if(inline_result)
+		ptr = inline_result;
+}
+
+void ProgramCompiler::FunctionInliner::visit(Block &block)
+{
+	if(extract_result)
+		--extract_result;
+
+	for(list<RefPtr<Node> >::iterator i=block.body.begin(); i!=block.body.end(); ++i)
+	{
+		(*i)->visit(*this);
+		if(extract_result)
+			--extract_result;
+	}
+}
+
+void ProgramCompiler::FunctionInliner::visit(UnaryExpression &unary)
+{
+	visit_and_inline(unary.expression);
+	inline_result = 0;
+}
+
+void ProgramCompiler::FunctionInliner::visit(BinaryExpression &binary)
+{
+	visit_and_inline(binary.left);
+	visit_and_inline(binary.right);
+	inline_result = 0;
+}
+
+void ProgramCompiler::FunctionInliner::visit(FunctionCall &call)
+{
+	for(vector<RefPtr<Expression> >::iterator i=call.arguments.begin(); i!=call.arguments.end(); ++i)
+		visit_and_inline(*i);
+
+	FunctionDeclaration *def = call.declaration;
+	if(def && def->definition!=def)
+		def = def->definition;
+
+	if(def && inlineable.count(def))
+	{
+		extract_result = 2;
+		def->visit(*this);
+	}
+	else
+		inline_result = 0;
+}
+
+void ProgramCompiler::FunctionInliner::visit(Return &ret)
+{
+	TraversingVisitor::visit(ret);
+
+	if(extract_result)
+		inline_result = ret.expression->clone();
+}
+
+
 ProgramCompiler::ExpressionEvaluator::ExpressionEvaluator():
 	variable_values(0),
 	result(0.0f),
@@ -865,6 +1118,11 @@ void ProgramCompiler::ExpressionEvaluator::visit(Literal &literal)
 	result_valid = true;
 }
 
+void ProgramCompiler::ExpressionEvaluator::visit(ParenthesizedExpression &parexp)
+{
+	parexp.expression->visit(*this);
+}
+
 void ProgramCompiler::ExpressionEvaluator::visit(VariableReference &var)
 {
 	if(!var.declaration)
@@ -928,30 +1186,13 @@ void ProgramCompiler::ExpressionEvaluator::visit(BinaryExpression &binary)
 
 
 ProgramCompiler::ConstantConditionEliminator::ConstantConditionEliminator():
-	scope_level(0),
-	remove_node(false),
-	replacement_block(0)
+	scope_level(0)
 { }
 
 void ProgramCompiler::ConstantConditionEliminator::visit(Block &block)
 {
 	SetForScope<unsigned> set(scope_level, scope_level+1);
-	for(list<NodePtr<Node> >::iterator i=block.body.begin(); i!=block.body.end(); )
-	{
-		(*i)->visit(*this);
-		if(replacement_block)
-		{
-			for(list<NodePtr<Node> >::iterator j=replacement_block->body.begin(); j!=replacement_block->body.end(); ++j)
-				block.body.insert(i, *j);
-			replacement_block = 0;
-		}
-
-		if(remove_node)
-			block.body.erase(i++);
-		else
-			++i;
-		remove_node = false;
-	}
+	BlockModifier::visit(block);
 
 	for(map<string, VariableDeclaration *>::const_iterator i=block.variables.begin(); i!=block.variables.end(); ++i)
 		variable_values.erase(i->second);
@@ -965,7 +1206,7 @@ void ProgramCompiler::ConstantConditionEliminator::visit(Assignment &assign)
 void ProgramCompiler::ConstantConditionEliminator::visit(VariableDeclaration &var)
 {
 	if(var.constant || scope_level>1)
-		variable_values[&var] = &*var.init_expression;
+		variable_values[&var] = var.init_expression.get();
 }
 
 void ProgramCompiler::ConstantConditionEliminator::visit(Conditional &cond)
@@ -973,10 +1214,7 @@ void ProgramCompiler::ConstantConditionEliminator::visit(Conditional &cond)
 	ExpressionEvaluator eval(variable_values);
 	cond.condition->visit(eval);
 	if(eval.result_valid)
-	{
-		remove_node = true;
-		replacement_block = (eval.result ? &cond.body : &cond.else_body);
-	}
+		flatten_block(eval.result ? cond.body : cond.else_body);
 	else
 		TraversingVisitor::visit(cond);
 }
@@ -1001,38 +1239,39 @@ void ProgramCompiler::ConstantConditionEliminator::visit(Iteration &iter)
 ProgramCompiler::UnusedVariableLocator::UnusedVariableLocator():
 	aggregate(0),
 	assignment(0),
-	assignment_target(false)
+	assignment_target(false),
+	global_scope(true)
 { }
 
 void ProgramCompiler::UnusedVariableLocator::apply(Stage &s)
 {
-	assignments.push_back(BlockAssignmentMap());
+	variables.push_back(BlockVariableMap());
 	Visitor::apply(s);
-	assignments.pop_back();
+	BlockVariableMap &global_variables = variables.back();
+	for(BlockVariableMap::iterator i=global_variables.begin(); i!=global_variables.end(); ++i)
+	{
+		if(i->first->interface=="out" && (s.type==FRAGMENT || i->first->linked_declaration || !i->first->name.compare(0, 3, "gl_")))
+			continue;
+		if(!i->second.referenced)
+		{
+			unused_nodes.insert(i->first);
+			clear_assignments(i->second, true);
+		}
+	}
+	variables.pop_back();
 }
 
 void ProgramCompiler::UnusedVariableLocator::visit(VariableReference &var)
 {
-	unused_nodes.erase(var.declaration);
-
 	map<VariableDeclaration *, Node *>::iterator i = aggregates.find(var.declaration);
 	if(i!=aggregates.end())
 		unused_nodes.erase(i->second);
 
-	if(assignment_target)
-		return;
-
-	for(vector<BlockAssignmentMap>::iterator j=assignments.end(); j!=assignments.begin(); )
+	if(var.declaration && !assignment_target)
 	{
-		--j;
-		BlockAssignmentMap::iterator k = j->find(var.declaration);
-		if(k!=j->end())
-		{
-			for(vector<Node *>::iterator l=k->second.nodes.begin(); l!=k->second.nodes.end(); ++l)
-				unused_nodes.erase(*l);
-			j->erase(k);
-			break;
-		}
+		VariableInfo &var_info = variables.back()[var.declaration];
+		var_info.assignments.clear();
+		var_info.referenced = true;
 	}
 }
 
@@ -1066,14 +1305,21 @@ void ProgramCompiler::UnusedVariableLocator::visit(Assignment &assign)
 
 void ProgramCompiler::UnusedVariableLocator::record_assignment(VariableDeclaration &var, Node &node, bool self_ref)
 {
-	unused_nodes.insert(&node);
-	BlockAssignmentMap &block_assignments = assignments.back();
-	AssignmentList &var_assignments = block_assignments[&var];
+	VariableInfo &var_info = variables.back()[&var];
 	if(!self_ref)
-		var_assignments.nodes.clear();
-	var_assignments.nodes.push_back(&node);
-	var_assignments.conditional = false;
-	var_assignments.self_referencing = self_ref;
+		clear_assignments(var_info, true);
+	var_info.assignments.push_back(&node);
+	var_info.conditionally_assigned = false;
+}
+
+void ProgramCompiler::UnusedVariableLocator::clear_assignments(VariableInfo &var_info, bool mark_unused)
+{
+	if(mark_unused)
+	{
+		for(vector<Node *>::iterator i=var_info.assignments.begin(); i!=var_info.assignments.end(); ++i)
+			unused_nodes.insert(*i);
+	}
+	var_info.assignments.clear();
 }
 
 void ProgramCompiler::UnusedVariableLocator::visit(ExpressionStatement &expr)
@@ -1097,7 +1343,7 @@ void ProgramCompiler::UnusedVariableLocator::visit(VariableDeclaration &var)
 		aggregates[&var] = aggregate;
 	else
 	{
-		unused_nodes.insert(&var);
+		variables.back()[&var].local = true;
 		if(var.init_expression)
 			record_assignment(var, *var.init_expression, false);
 	}
@@ -1114,87 +1360,121 @@ void ProgramCompiler::UnusedVariableLocator::visit(InterfaceBlock &iface)
 
 void ProgramCompiler::UnusedVariableLocator::visit(FunctionDeclaration &func)
 {
-	assignments.push_back(BlockAssignmentMap());
+	variables.push_back(BlockVariableMap());
 
-	for(vector<NodePtr<VariableDeclaration> >::iterator i=func.parameters.begin(); i!=func.parameters.end(); ++i)
-		(*i)->visit(*this);
-	func.body.visit(*this);
-
-	BlockAssignmentMap &block_assignments = assignments.back();
-	for(map<string, VariableDeclaration *>::iterator i=func.body.variables.begin(); i!=func.body.variables.end(); ++i)
-		block_assignments.erase(i->second);
-	for(BlockAssignmentMap::iterator i=block_assignments.begin(); i!=block_assignments.end(); ++i)
 	{
-		if(i->first->interface=="out" && stage->type!=FRAGMENT && !i->first->linked_declaration)
-			continue;
-
-		for(vector<Node *>::iterator j=i->second.nodes.begin(); j!=i->second.nodes.end(); ++j)
-			unused_nodes.erase(*j);
+		SetForScope<bool> set(global_scope, false);
+		for(vector<RefPtr<VariableDeclaration> >::iterator i=func.parameters.begin(); i!=func.parameters.end(); ++i)
+			(*i)->visit(*this);
+		func.body.visit(*this);
 	}
 
-	assignments.pop_back();
+	BlockVariableMap &block_variables = variables.back();
+	for(BlockVariableMap::iterator i=block_variables.begin(); i!=block_variables.end(); ++i)
+		i->second.conditionally_assigned = true;
+	for(vector<RefPtr<VariableDeclaration> >::iterator i=func.parameters.begin(); i!=func.parameters.end(); ++i)
+		block_variables[i->get()].referenced = true;
+	merge_down_variables();
 }
 
-void ProgramCompiler::UnusedVariableLocator::merge_down_assignments()
+void ProgramCompiler::UnusedVariableLocator::merge_down_variables()
 {
-	BlockAssignmentMap &parent_assignments = assignments[assignments.size()-2];
-	BlockAssignmentMap &block_assignments = assignments.back();
-	for(BlockAssignmentMap::iterator i=block_assignments.begin(); i!=block_assignments.end(); ++i)
+	BlockVariableMap &parent_variables = variables[variables.size()-2];
+	BlockVariableMap &block_variables = variables.back();
+	for(BlockVariableMap::iterator i=block_variables.begin(); i!=block_variables.end(); ++i)
 	{
-		BlockAssignmentMap::iterator j = parent_assignments.find(i->first);
-		if(j==parent_assignments.end())
-			parent_assignments.insert(*i);
-		else if(i->second.self_referencing || i->second.conditional)
+		if(i->second.local)
 		{
-			j->second.nodes.insert(j->second.nodes.end(), i->second.nodes.begin(), i->second.nodes.end());
-			j->second.conditional |= i->second.conditional;
-			j->second.self_referencing |= i->second.self_referencing;
+			if(!i->second.referenced)
+				unused_nodes.insert(i->first);
+			clear_assignments(i->second, true);
+			continue;
 		}
+
+		BlockVariableMap::iterator j = parent_variables.find(i->first);
+		if(j==parent_variables.end())
+			parent_variables.insert(*i);
 		else
-			j->second = i->second;
+		{
+			if(i->second.referenced || !i->second.conditionally_assigned)
+				clear_assignments(j->second, !i->second.referenced);
+			j->second.conditionally_assigned = i->second.conditionally_assigned;
+			j->second.referenced |= i->second.referenced;
+			j->second.assignments.insert(j->second.assignments.end(), i->second.assignments.begin(), i->second.assignments.end());
+		}
 	}
-	assignments.pop_back();
+	variables.pop_back();
 }
 
 void ProgramCompiler::UnusedVariableLocator::visit(Conditional &cond)
 {
 	cond.condition->visit(*this);
-	assignments.push_back(BlockAssignmentMap());
+	variables.push_back(BlockVariableMap());
 	cond.body.visit(*this);
 
-	BlockAssignmentMap if_assignments;
-	swap(assignments.back(), if_assignments);
+	BlockVariableMap if_variables;
+	swap(variables.back(), if_variables);
 	cond.else_body.visit(*this);
 
-	BlockAssignmentMap &else_assignments = assignments.back();
-	for(BlockAssignmentMap::iterator i=else_assignments.begin(); i!=else_assignments.end(); ++i)
+	BlockVariableMap &else_variables = variables.back();
+	for(BlockVariableMap::iterator i=else_variables.begin(); i!=else_variables.end(); ++i)
 	{
-		BlockAssignmentMap::iterator j = if_assignments.find(i->first);
-		if(j!=if_assignments.end())
+		BlockVariableMap::iterator j = if_variables.find(i->first);
+		if(j!=if_variables.end())
 		{
-			i->second.nodes.insert(i->second.nodes.end(), j->second.nodes.begin(), j->second.nodes.end());
-			i->second.conditional |= j->second.conditional;
-			i->second.self_referencing |= j->second.self_referencing;
-			if_assignments.erase(j);
+			i->second.assignments.insert(i->second.assignments.end(), j->second.assignments.begin(), j->second.assignments.end());
+			i->second.conditionally_assigned |= j->second.conditionally_assigned;
+			if_variables.erase(j);
 		}
 		else
-			i->second.conditional = true;
+			i->second.conditionally_assigned = true;
 	}
 
-	for(BlockAssignmentMap::iterator i=if_assignments.begin(); i!=if_assignments.end(); ++i)
+	for(BlockVariableMap::iterator i=if_variables.begin(); i!=if_variables.end(); ++i)
 	{
-		i->second.conditional = true;
-		else_assignments.insert(*i);
+		i->second.conditionally_assigned = true;
+		else_variables.insert(*i);
 	}
 
-	merge_down_assignments();
+	merge_down_variables();
 }
 
 void ProgramCompiler::UnusedVariableLocator::visit(Iteration &iter)
 {
-	assignments.push_back(BlockAssignmentMap());
+	variables.push_back(BlockVariableMap());
 	TraversingVisitor::visit(iter);
-	merge_down_assignments();
+
+	BlockVariableMap &block_variables = variables.back();
+	for(BlockVariableMap::iterator i=block_variables.begin(); i!=block_variables.end(); ++i)
+		if(!i->second.local && i->second.referenced)
+			i->second.assignments.clear();
+
+	merge_down_variables();
+}
+
+
+ProgramCompiler::UnusedVariableLocator::VariableInfo::VariableInfo():
+	local(false),
+	conditionally_assigned(false),
+	referenced(false)
+{ }
+
+
+void ProgramCompiler::UnusedFunctionLocator::visit(FunctionCall &call)
+{
+	TraversingVisitor::visit(call);
+
+	unused_nodes.erase(call.declaration);
+	if(call.declaration && call.declaration->definition!=call.declaration)
+		used_definitions.insert(call.declaration->definition);
+}
+
+void ProgramCompiler::UnusedFunctionLocator::visit(FunctionDeclaration &func)
+{
+	TraversingVisitor::visit(func);
+
+	if((func.name!="main" || func.body.body.empty()) && !used_definitions.count(&func))
+		unused_nodes.insert(&func);
 }
 
 
@@ -1204,10 +1484,10 @@ ProgramCompiler::NodeRemover::NodeRemover(const set<Node *> &r):
 
 void ProgramCompiler::NodeRemover::visit(Block &block)
 {
-	for(list<NodePtr<Node> >::iterator i=block.body.begin(); i!=block.body.end(); )
+	for(list<RefPtr<Node> >::iterator i=block.body.begin(); i!=block.body.end(); )
 	{
 		(*i)->visit(*this);
-		if(to_remove.count(&**i))
+		if(to_remove.count(i->get()))
 			block.body.erase(i++);
 		else
 			++i;
@@ -1220,12 +1500,223 @@ void ProgramCompiler::NodeRemover::visit(VariableDeclaration &var)
 	{
 		stage->in_variables.erase(var.name);
 		stage->out_variables.erase(var.name);
+		stage->locations.erase(var.name);
 		if(var.linked_declaration)
 			var.linked_declaration->linked_declaration = 0;
 	}
-	else if(var.init_expression && to_remove.count(&*var.init_expression))
+	else if(var.init_expression && to_remove.count(var.init_expression.get()))
 		var.init_expression = 0;
 }
 
+
+void ProgramCompiler::PrecisionRemover::visit(Precision &)
+{
+	remove_node = true;
+}
+
+void ProgramCompiler::PrecisionRemover::visit(VariableDeclaration &var)
+{
+	var.precision.clear();
+}
+
+
+ProgramCompiler::DefaultPrecisionGenerator::DefaultPrecisionGenerator():
+	toplevel(true)
+{ }
+
+void ProgramCompiler::DefaultPrecisionGenerator::visit(Block &block)
+{
+	if(toplevel)
+	{
+		SetForScope<bool> set(toplevel, false);
+		BlockModifier::visit(block);
+	}
+	else
+		Visitor::visit(block);
+}
+
+void ProgramCompiler::DefaultPrecisionGenerator::visit(Precision &prec)
+{
+	have_default.insert(prec.type);
+}
+
+void ProgramCompiler::DefaultPrecisionGenerator::visit(VariableDeclaration &var)
+{
+	if(var.type_declaration)
+		return;
+
+	string type = var.type;
+	if(!type.compare(0, 3, "vec") || !type.compare(0, 3, "mat"))
+		type = "float";
+	else if(!type.compare(0, 3, "ivec") || type=="uint")
+		type = "int";
+
+	if(!have_default.count(type))
+	{
+		Precision *prec = new Precision;
+		if(!type.compare(0, 7, "sampler"))
+			prec->precision = "lowp";
+		else if(stage->type==FRAGMENT)
+			prec->precision = "mediump";
+		else
+			prec->precision = "highp";
+		prec->type = type;
+		insert_nodes.push_back(prec);
+
+		have_default.insert(type);
+	}
+}
+
+
+ProgramCompiler::LegacyConverter::LegacyConverter():
+	target_api(get_gl_api()),
+	target_version(get_glsl_version()),
+	frag_out(0)
+{ }
+
+ProgramCompiler::LegacyConverter::LegacyConverter(const Version &v):
+	target_api(get_gl_api()),
+	target_version(v),
+	frag_out(0)
+{ }
+
+bool ProgramCompiler::LegacyConverter::check_version(const Version &feature_version) const
+{
+	if(target_version<feature_version)
+		return false;
+	else if(stage->required_version<feature_version)
+		stage->required_version = feature_version;
+
+	return true;
+}
+
+bool ProgramCompiler::LegacyConverter::supports_unified_interface_syntax() const
+{
+	if(target_api==OPENGL_ES2)
+		return check_version(Version(3, 0));
+	else
+		return check_version(Version(1, 30));
+}
+
+void ProgramCompiler::LegacyConverter::visit(VariableReference &var)
+{
+	if(var.declaration==frag_out && !supports_unified_interface_syntax())
+	{
+		var.name = "gl_FragColor";
+		var.declaration = 0;
+		type = "vec4";
+	}
+	else if(var.declaration)
+		type = var.declaration->type;
+	else
+		type = string();
+}
+
+void ProgramCompiler::LegacyConverter::visit(Assignment &assign)
+{
+	TraversingVisitor::visit(assign);
+	if(assign.target_declaration==frag_out && !supports_unified_interface_syntax())
+		assign.target_declaration = 0;
+}
+
+bool ProgramCompiler::LegacyConverter::supports_unified_sampling_functions() const
+{
+	if(target_api==OPENGL_ES2)
+		return check_version(Version(3, 0));
+	else
+		return check_version(Version(1, 30));
+}
+
+void ProgramCompiler::LegacyConverter::visit(FunctionCall &call)
+{
+	if(call.name=="texture" && !call.declaration && !supports_unified_sampling_functions())
+	{
+		vector<RefPtr<Expression> >::iterator i = call.arguments.begin();
+		if(i!=call.arguments.end())
+		{
+			(*i)->visit(*this);
+			if(type=="sampler1D")
+				call.name = "texture1D";
+			else if(type=="sampler2D")
+				call.name = "texture2D";
+			else if(type=="sampler3D")
+				call.name = "texture3D";
+			else if(type=="sampler1DShadow")
+				call.name = "shadow1D";
+			else if(type=="sampler2DShadow")
+				call.name = "shadow2D";
+
+			for(; i!=call.arguments.end(); ++i)
+				(*i)->visit(*this);
+		}
+	}
+	else
+		TraversingVisitor::visit(call);
+}
+
+bool ProgramCompiler::LegacyConverter::supports_interface_layouts() const
+{
+	if(target_api==OPENGL_ES2)
+		return check_version(Version(3, 0));
+	else
+		return check_version(Version(3, 30));
+}
+
+void ProgramCompiler::LegacyConverter::visit(VariableDeclaration &var)
+{
+	if(var.layout && !supports_interface_layouts())
+	{
+		vector<Layout::Qualifier>::iterator i;
+		for(i=var.layout->qualifiers.begin(); (i!=var.layout->qualifiers.end() && i->identifier!="location"); ++i) ;
+		if(i!=var.layout->qualifiers.end())
+		{
+			unsigned location = lexical_cast<unsigned>(i->value);
+			if(stage->type==VERTEX && var.interface=="in")
+			{
+				stage->locations[var.name] = location;
+				var.layout->qualifiers.erase(i);
+			}
+			else if(stage->type==FRAGMENT && var.interface=="out")
+			{
+				stage->locations[var.name] = location;
+				var.layout->qualifiers.erase(i);
+			}
+
+			if(var.layout->qualifiers.empty())
+				var.layout = 0;
+		}
+	}
+
+	if((var.interface=="in" || var.interface=="out") && !supports_unified_interface_syntax())
+	{
+		if(stage->type==FRAGMENT && var.interface=="out")
+		{
+			frag_out = &var;
+			remove_node = true;
+		}
+	}
+
+	TraversingVisitor::visit(var);
+}
+
+bool ProgramCompiler::LegacyConverter::supports_interface_blocks(const string &iface) const
+{
+	if(target_api==OPENGL_ES2)
+	{
+		if(iface=="uniform")
+			return check_version(Version(3, 0));
+		else
+			return check_version(Version(3, 20));
+	}
+	else
+		return check_version(Version(1, 50));
+}
+
+void ProgramCompiler::LegacyConverter::visit(InterfaceBlock &iface)
+{
+	if(!supports_interface_blocks(iface.interface))
+		flatten_block(iface.members);
+}
+
 } // namespace GL
 } // namespace Msp