X-Git-Url: http://git.tdb.fi/?a=blobdiff_plain;f=source%2Fglsl%2Foptimize.cpp;h=68d3f1d77a9b1233701629b2f27b319bfec43e3d;hb=3a6eb030fb4eca4c2a317f270704fddf31613130;hp=0f765c2a4aa6ce23edd99f2dd0fed35e4041bd3c;hpb=305b62cf4f7e2a4ca3cc56109003aed6bde61c25;p=libs%2Fgl.git

diff --git a/source/glsl/optimize.cpp b/source/glsl/optimize.cpp
index 0f765c2a..68d3f1d7 100644
--- a/source/glsl/optimize.cpp
+++ b/source/glsl/optimize.cpp
@@ -138,7 +138,7 @@ string InlineContentInjector::apply(Stage &stage, FunctionDeclaration &target_fu
 	staging_block.parent = &tgt_blk;
 	staging_block.variables.clear();
 
-	std::vector<RefPtr<VariableDeclaration> > params;
+	vector<RefPtr<VariableDeclaration> > params;
 	params.reserve(source_func->parameters.size());
 	for(NodeArray<VariableDeclaration>::iterator i=source_func->parameters.begin(); i!=source_func->parameters.end(); ++i)
 	{
@@ -907,6 +907,52 @@ void ConstantConditionEliminator::visit(Iteration &iter)
 }
 
 
+UnreachableCodeRemover::UnreachableCodeRemover():
+	reachable(true)
+{ }
+
+bool UnreachableCodeRemover::apply(Stage &stage)
+{
+	stage.content.visit(*this);
+	NodeRemover().apply(stage, unreachable_nodes);
+	return !unreachable_nodes.empty();
+}
+
+void UnreachableCodeRemover::visit(Block &block)
+{
+	NodeList<Statement>::iterator i = block.body.begin();
+	for(; (reachable && i!=block.body.end()); ++i)
+		(*i)->visit(*this);
+	for(; i!=block.body.end(); ++i)
+		unreachable_nodes.insert(i->get());
+}
+
+void UnreachableCodeRemover::visit(FunctionDeclaration &func)
+{
+	TraversingVisitor::visit(func);
+	reachable = true;
+}
+
+void UnreachableCodeRemover::visit(Conditional &cond)
+{
+	cond.body.visit(*this);
+	bool reachable_if_true = reachable;
+	reachable = true;
+	cond.else_body.visit(*this);
+
+	reachable |= reachable_if_true;
+}
+
+void UnreachableCodeRemover::visit(Iteration &iter)
+{
+	TraversingVisitor::visit(iter);
+
+	/* Always consider code after a loop reachable, since there's no checking
+	for whether the loop executes. */
+	reachable = true;
+}
+
+
 bool UnusedTypeRemover::apply(Stage &stage)
 {
 	stage.content.visit(*this);