X-Git-Url: http://git.tdb.fi/?a=blobdiff_plain;f=source%2Fprogramcompiler.cpp;h=2bb2694609f89277b9d36efc50a0df5de0354d34;hb=a209ca32465c61b38f3a57ee6577568f3994e8ab;hp=bc021c97b04874ccf375d82383218da4d9a4b4d7;hpb=a29cc14162e911b36d18d1d1896216697c7dc0c1;p=libs%2Fgl.git

diff --git a/source/programcompiler.cpp b/source/programcompiler.cpp
index bc021c97..2bb26946 100644
--- a/source/programcompiler.cpp
+++ b/source/programcompiler.cpp
@@ -8,6 +8,26 @@
 
 using namespace std;
 
+namespace {
+
+const char builtins_src[] =
+	"////// vertex\n"
+	"out gl_PerVertex {\n"
+	"  vec4 gl_Position;\n"
+	"  float gl_ClipDistance[];\n"
+	"};"
+	"////// geometry\n"
+	"in gl_PerVertex {\n"
+	"  vec4 gl_Position;\n"
+	"  float gl_ClipDistance[];\n"
+	"} gl_in[];\n"
+	"out gl_PerVertex {\n"
+	"  vec4 gl_Position;\n"
+	"  float gl_ClipDistance[];\n"
+	"};\n";
+
+}
+
 namespace Msp {
 namespace GL {
 
@@ -51,43 +71,68 @@ void ProgramCompiler::add_shaders(Program &program)
 	program.bind_attribute(TEXCOORD4, "texcoord");
 }
 
+Module *ProgramCompiler::create_builtins_module()
+{
+	ProgramParser parser;
+	Module *module = new Module(parser.parse(builtins_src));
+	for(list<Stage>::iterator i=module->stages.begin(); i!=module->stages.end(); ++i)
+	{
+		VariableResolver resolver;
+		i->content.visit(resolver);
+		for(map<string, VariableDeclaration *>::iterator j=i->content.variables.begin(); j!=i->content.variables.end(); ++j)
+			j->second->linked_declaration = j->second;
+	}
+	return module;
+}
+
+Module &ProgramCompiler::get_builtins_module()
+{
+	static RefPtr<Module> builtins_module = create_builtins_module();
+	return *builtins_module;
+}
+
+Stage *ProgramCompiler::get_builtins(StageType type)
+{
+	Module &module = get_builtins_module();
+	for(list<Stage>::iterator i=module.stages.begin(); i!=module.stages.end(); ++i)
+		if(i->type==type)
+			return &*i;
+	return 0;
+}
+
 void ProgramCompiler::process()
 {
 	for(list<Stage>::iterator i=module->stages.begin(); i!=module->stages.end(); ++i)
 		generate(*i);
-	for(list<Stage>::iterator i=module->stages.begin(); i!=module->stages.end(); ++i)
-		optimize(*i);
+	for(list<Stage>::iterator i=module->stages.begin(); i!=module->stages.end(); )
+	{
+		if(optimize(*i))
+			i = module->stages.begin();
+		else
+			++i;
+	}
 }
 
 void ProgramCompiler::generate(Stage &stage)
 {
 	inject_block(stage.content, module->shared.content);
 
-	resolve_variables(stage);
-
-	InterfaceGenerator generator;
-	generator.visit(stage);
-
-	resolve_variables(stage);
-
-	VariableRenamer renamer;
-	stage.content.visit(renamer);
+	apply<VariableResolver>(stage);
+	apply<InterfaceGenerator>(stage);
+	apply<VariableResolver>(stage);
+	apply<VariableRenamer>(stage);
 }
 
-void ProgramCompiler::optimize(Stage &stage)
+bool ProgramCompiler::optimize(Stage &stage)
 {
-	while(1)
-	{
-		UnusedVariableLocator unused_locator;
-		unused_locator.visit(stage);
+	UnusedVariableLocator unused_locator;
+	unused_locator.apply(stage);
 
-		NodeRemover remover;
-		remover.to_remove = unused_locator.unused_nodes;
-		remover.visit(stage);
+	NodeRemover remover;
+	remover.to_remove = unused_locator.unused_nodes;
+	remover.apply(stage);
 
-		if(!remover.n_removed)
-			break;
-	}
+	return !unused_locator.unused_nodes.empty();
 }
 
 void ProgramCompiler::inject_block(Block &target, const Block &source)
@@ -97,20 +142,32 @@ void ProgramCompiler::inject_block(Block &target, const Block &source)
 		target.body.insert(insert_point, (*i)->clone());
 }
 
-void ProgramCompiler::resolve_variables(Stage &stage)
+template<typename T>
+void ProgramCompiler::apply(Stage &stage)
 {
-	VariableResolver resolver;
-	stage.content.visit(resolver);
+	T visitor;
+	visitor.apply(stage);
 }
 
 string ProgramCompiler::create_source(Stage &stage)
 {
 	Formatter formatter;
-	stage.content.visit(formatter);
+	formatter.apply(stage);
 	return formatter.formatted;
 }
 
 
+ProgramCompiler::Visitor::Visitor():
+	stage(0)
+{ }
+
+void ProgramCompiler::Visitor::apply(Stage &s)
+{
+	SetForScope<Stage *> set(stage, &s);
+	stage->content.visit(*this);
+}
+
+
 ProgramCompiler::Formatter::Formatter():
 	indent(0),
 	parameter_list(false),
@@ -234,7 +291,7 @@ void ProgramCompiler::Formatter::visit(VariableDeclaration &var)
 		formatted += "const ";
 	if(!var.sampling.empty())
 		formatted += format("%s ", var.sampling);
-	if(!var.interface.empty())
+	if(!var.interface.empty() && var.interface!=block_interface)
 		formatted += format("%s ", var.interface);
 	formatted += format("%s %s", var.type, var.name);
 	if(var.array)
@@ -255,6 +312,7 @@ void ProgramCompiler::Formatter::visit(VariableDeclaration &var)
 
 void ProgramCompiler::Formatter::visit(InterfaceBlock &iface)
 {
+	SetForScope<string> set(block_interface, iface.interface);
 	formatted += format("%s %s\n", iface.interface, iface.name);
 	iface.members.visit(*this);
 	formatted += ';';
@@ -325,6 +383,17 @@ ProgramCompiler::VariableResolver::VariableResolver():
 	anonymous(false)
 { }
 
+void ProgramCompiler::VariableResolver::apply(Stage &s)
+{
+	SetForScope<Stage *> set(stage, &s);
+	Stage *builtins = get_builtins(stage->type);
+	if(builtins)
+		blocks.push_back(&builtins->content);
+	stage->content.visit(*this);
+	if(builtins)
+		blocks.pop_back();
+}
+
 void ProgramCompiler::VariableResolver::visit(Block &block)
 {
 	blocks.push_back(&block);
@@ -399,6 +468,9 @@ void ProgramCompiler::VariableResolver::visit(VariableDeclaration &var)
 			var.type_declaration = j->second;
 	}
 
+	if(!block_interface.empty() && var.interface.empty())
+		var.interface = block_interface;
+
 	TraversingVisitor::visit(var);
 	blocks.back()->variables[var.name] = &var;
 	if(anonymous && blocks.size()>1)
@@ -408,12 +480,12 @@ void ProgramCompiler::VariableResolver::visit(VariableDeclaration &var)
 void ProgramCompiler::VariableResolver::visit(InterfaceBlock &iface)
 {
 	SetFlag set(anonymous);
+	SetForScope<string> set2(block_interface, iface.interface);
 	TraversingVisitor::visit(iface);
 }
 
 
 ProgramCompiler::InterfaceGenerator::InterfaceGenerator():
-	stage(0),
 	scope_level(0),
 	remove_node(false)
 { }
@@ -428,7 +500,7 @@ string ProgramCompiler::InterfaceGenerator::get_out_prefix(StageType type)
 		return string();
 }
 
-void ProgramCompiler::InterfaceGenerator::visit(Stage &s)
+void ProgramCompiler::InterfaceGenerator::apply(Stage &s)
 {
 	SetForScope<Stage *> set(stage, &s);
 	if(stage->previous)
@@ -446,7 +518,7 @@ void ProgramCompiler::InterfaceGenerator::visit(Block &block)
 
 		if(scope_level==1)
 		{
-			for(map<string, NodePtr<Node> >::iterator j=iface_declarations.begin(); j!=iface_declarations.end(); ++j)
+			for(map<string, VariableDeclaration *>::iterator j=iface_declarations.begin(); j!=iface_declarations.end(); ++j)
 			{
 				list<NodePtr<Node> >::iterator k = block.body.insert(i, j->second);
 				(*k)->visit(*this);
@@ -454,7 +526,7 @@ void ProgramCompiler::InterfaceGenerator::visit(Block &block)
 			iface_declarations.clear();
 		}
 
-		for(list<NodePtr<Node> >::iterator j=insert_nodes.begin(); j!=insert_nodes.end(); ++j)
+		for(list<Node *>::iterator j=insert_nodes.begin(); j!=insert_nodes.end(); ++j)
 			block.body.insert(i, *j);
 		insert_nodes.clear();
 
@@ -472,23 +544,27 @@ string ProgramCompiler::InterfaceGenerator::change_prefix(const string &name, co
 	return prefix+name.substr(offset);
 }
 
-bool ProgramCompiler::InterfaceGenerator::generate_interface(VariableDeclaration &out, const string &iface, const string &name)
+bool ProgramCompiler::InterfaceGenerator::generate_interface(VariableDeclaration &var, const string &iface, const string &name)
 {
 	const map<string, VariableDeclaration *> &stage_vars = (iface=="in" ? stage->in_variables : stage->out_variables);
 	if(stage_vars.count(name) || iface_declarations.count(name))
 		return false;
 
 	VariableDeclaration* iface_var = new VariableDeclaration;
-	iface_var->sampling = out.sampling;
+	iface_var->sampling = var.sampling;
 	iface_var->interface = iface;
-	iface_var->type = out.type;
-	iface_var->type_declaration = out.type_declaration;
+	iface_var->type = var.type;
+	iface_var->type_declaration = var.type_declaration;
 	iface_var->name = name;
-	iface_var->array = (out.array || (stage->type==GEOMETRY && iface=="in"));
-	iface_var->array_size = out.array_size;
+	if(stage->type==GEOMETRY)
+		iface_var->array = ((var.array && var.interface!="in") || iface=="in");
+	else
+		iface_var->array = var.array;
+	if(iface_var->array)
+		iface_var->array_size = var.array_size;
 	if(iface=="in")
-		iface_var->linked_declaration = &out;
-	iface_declarations[iface_var->name] = iface_var;
+		iface_var->linked_declaration = &var;
+	iface_declarations[name] = iface_var;
 
 	return true;
 }
@@ -558,31 +634,66 @@ void ProgramCompiler::InterfaceGenerator::visit(VariableDeclaration &var)
 
 void ProgramCompiler::InterfaceGenerator::visit(Passthrough &pass)
 {
+	vector<VariableDeclaration *> pass_vars;
+
+	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)
+		if(i->second->interface=="in")
+			pass_vars.push_back(i->second);
+
 	if(stage->previous)
 	{
 		const map<string, VariableDeclaration *> &prev_out = stage->previous->out_variables;
 		for(map<string, VariableDeclaration *>::const_iterator i=prev_out.begin(); i!=prev_out.end(); ++i)
 		{
-			string out_name = change_prefix(i->second->name, out_prefix);
-			generate_interface(*i->second, "in", i->second->name);
-			generate_interface(*i->second, "out", out_name);
+			bool linked = false;
+			for(vector<VariableDeclaration *>::const_iterator j=pass_vars.begin(); (!linked && j!=pass_vars.end()); ++j)
+				linked = ((*j)->linked_declaration==i->second);
 
-			VariableReference *ref = new VariableReference;
-			ref->name = i->first;
-			if(pass.subscript)
-			{
-				BinaryExpression *subscript = new BinaryExpression;
-				subscript->left = ref;
-				subscript->oper = "[";
-				subscript->right = pass.subscript;
-				subscript->after = "]";
-				insert_assignment(out_name, subscript);
-			}
-			else
-				insert_assignment(out_name, ref);
+			if(!linked && generate_interface(*i->second, "in", i->second->name))
+				pass_vars.push_back(i->second);
 		}
 	}
 
+	if(stage->type==GEOMETRY)
+	{
+		VariableReference *ref = new VariableReference;
+		ref->name = "gl_in";
+
+		BinaryExpression *subscript = new BinaryExpression;
+		subscript->left = ref;
+		subscript->oper = "[";
+		subscript->right = pass.subscript;
+		subscript->after = "]";
+
+		MemberAccess *memacc = new MemberAccess;
+		memacc->left = subscript;
+		memacc->member = "gl_Position";
+
+		insert_assignment("gl_Position", memacc);
+	}
+
+	for(vector<VariableDeclaration *>::const_iterator i=pass_vars.begin(); i!=pass_vars.end(); ++i)
+	{
+		string out_name = change_prefix((*i)->name, out_prefix);
+		generate_interface(**i, "out", out_name);
+
+		VariableReference *ref = new VariableReference;
+		ref->name = (*i)->name;
+		if(pass.subscript)
+		{
+			BinaryExpression *subscript = new BinaryExpression;
+			subscript->left = ref;
+			subscript->oper = "[";
+			subscript->right = pass.subscript;
+			subscript->after = "]";
+			insert_assignment(out_name, subscript);
+		}
+		else
+			insert_assignment(out_name, ref);
+	}
+
 	remove_node = true;
 }
 
@@ -602,28 +713,41 @@ void ProgramCompiler::VariableRenamer::visit(VariableDeclaration &var)
 
 
 ProgramCompiler::UnusedVariableLocator::UnusedVariableLocator():
-	stage(0),
+	aggregate(0),
 	assignment(false),
-	assignment_target(0)
+	record_target(false),
+	assignment_target(0),
+	indeterminate_target(false),
+	self_referencing(false)
 { }
 
-void ProgramCompiler::UnusedVariableLocator::visit(Stage &s)
-{
-	stage = &s;
-	stage->content.visit(*this);
-}
-
 void ProgramCompiler::UnusedVariableLocator::visit(VariableReference &var)
 {
-	if(assignment)
-		assignment_target = var.declaration;
+	if(record_target)
+	{
+		if(assignment_target)
+			indeterminate_target = true;
+		else
+			assignment_target = var.declaration;
+	}
 	else
 	{
 		unused_nodes.erase(var.declaration);
+
 		map<VariableDeclaration *, Node *>::iterator i = assignments.find(var.declaration);
 		if(i!=assignments.end())
+		{
 			unused_nodes.erase(i->second);
+			assignments.erase(i);
+		}
+
+		if(assignment && var.declaration==assignment_target)
+			self_referencing = true;
 	}
+
+	map<VariableDeclaration *, Node *>::iterator i = aggregates.find(var.declaration);
+	if(i!=aggregates.end())
+		unused_nodes.erase(i->second);
 }
 
 void ProgramCompiler::UnusedVariableLocator::visit(MemberAccess &memacc)
@@ -636,9 +760,20 @@ void ProgramCompiler::UnusedVariableLocator::visit(BinaryExpression &binary)
 {
 	if(binary.assignment)
 	{
-		binary.right->visit(*this);
 		assignment = true;
+		{
+			SetFlag set(record_target);
+			binary.left->visit(*this);
+		}
+		if(binary.oper!="=")
+			self_referencing = true;
+		binary.right->visit(*this);
+	}
+	else if(record_target && binary.oper=="[")
+	{
 		binary.left->visit(*this);
+		SetForScope<bool> set(record_target, false);
+		binary.right->visit(*this);
 	}
 	else
 		TraversingVisitor::visit(binary);
@@ -648,66 +783,69 @@ void ProgramCompiler::UnusedVariableLocator::visit(ExpressionStatement &expr)
 {
 	assignment = false;
 	assignment_target = 0;
+	indeterminate_target = false;
+	self_referencing = false;
 	TraversingVisitor::visit(expr);
-	if(assignment && assignment_target)
+	if(assignment && assignment_target && !indeterminate_target)
 	{
-		if(assignment_target->interface!="out" || (stage->type!=FRAGMENT && !assignment_target->linked_declaration))
-		{
-			unused_nodes.insert(&expr);
-			assignments[assignment_target] = &expr;
-		}
-		else
+		Node *&assign = assignments[assignment_target];
+		if(self_referencing)
+			unused_nodes.erase(assign);
+		else if(assign)
+			unused_nodes.insert(assign);
+		assign = &expr;
+		if(assignment_target->interface=="out" && (stage->type==FRAGMENT || assignment_target->linked_declaration))
 			unused_nodes.erase(assignment_target);
+		else
+			unused_nodes.insert(&expr);
 	}
 	assignment = false;
 }
 
+void ProgramCompiler::UnusedVariableLocator::visit(StructDeclaration &strct)
+{
+	SetForScope<Node *> set(aggregate, &strct);
+	unused_nodes.insert(&strct);
+	TraversingVisitor::visit(strct);
+}
+
 void ProgramCompiler::UnusedVariableLocator::visit(VariableDeclaration &var)
 {
-	unused_nodes.insert(&var);
+	if(aggregate)
+		aggregates[&var] = aggregate;
+	else
+	{
+		unused_nodes.insert(&var);
+		if(var.init_expression)
+		{
+			unused_nodes.insert(&*var.init_expression);
+			assignments[&var] = &*var.init_expression;
+		}
+	}
+	unused_nodes.erase(var.type_declaration);
 	TraversingVisitor::visit(var);
 }
 
-
-ProgramCompiler::NodeRemover::NodeRemover():
-	stage(0),
-	n_removed(0),
-	immutable_block(false),
-	remove_block(false)
-{ }
-
-void ProgramCompiler::NodeRemover::visit(Stage &s)
+void ProgramCompiler::UnusedVariableLocator::visit(InterfaceBlock &iface)
 {
-	stage = &s;
-	stage->content.visit(*this);
+	SetForScope<Node *> set(aggregate, &iface);
+	unused_nodes.insert(&iface);
+	TraversingVisitor::visit(iface);
 }
 
+
 void ProgramCompiler::NodeRemover::visit(Block &block)
 {
-	remove_block = immutable_block;
 	for(list<NodePtr<Node> >::iterator i=block.body.begin(); i!=block.body.end(); )
 	{
-		bool remove = to_remove.count(&**i);
-		if(!remove)
-			remove_block = false;
 		(*i)->visit(*this);
-
-		if(remove ? !immutable_block : remove_block)
-		{
+		if(to_remove.count(&**i))
 			block.body.erase(i++);
-			++n_removed;
-		}
 		else
 			++i;
 	}
 }
 
-void ProgramCompiler::NodeRemover::visit(StructDeclaration &strct)
-{
-	SetFlag set(immutable_block);
-	TraversingVisitor::visit(strct);
-}
-
 void ProgramCompiler::NodeRemover::visit(VariableDeclaration &var)
 {
 	if(to_remove.count(&var))
@@ -717,12 +855,8 @@ void ProgramCompiler::NodeRemover::visit(VariableDeclaration &var)
 		if(var.linked_declaration)
 			var.linked_declaration->linked_declaration = 0;
 	}
-}
-
-void ProgramCompiler::NodeRemover::visit(InterfaceBlock &iface)
-{
-	SetFlag set(immutable_block);
-	TraversingVisitor::visit(iface);
+	else if(var.init_expression && to_remove.count(&*var.init_expression))
+		var.init_expression = 0;
 }
 
 } // namespace GL