X-Git-Url: http://git.tdb.fi/?a=blobdiff_plain;f=source%2Fglsl%2Foptimize.cpp;h=96a75d603d6db5bdaaae35de41bbe16fb938cecf;hb=6997ed1c07c382c0f66c57c080934ad53e1d3713;hp=a8ff44a50e44fa94b8eb3d799f3ec1d64eb22988;hpb=c43203c52410ee8a734e775e7ee7368a12f82ff7;p=libs%2Fgl.git

diff --git a/source/glsl/optimize.cpp b/source/glsl/optimize.cpp
index a8ff44a5..96a75d60 100644
--- a/source/glsl/optimize.cpp
+++ b/source/glsl/optimize.cpp
@@ -356,7 +356,7 @@ void ExpressionInliner::visit(RefPtr<Expression> &expr)
 		ExpressionUse use;
 		use.reference = &expr;
 		use.ref_scope = current_block;
-		use.blocked = access_write;
+		use.blocked = access_write || r_ref_info->blocked;
 
 		if(iteration_body && !r_ref_info->trivial)
 		{
@@ -402,7 +402,7 @@ void ExpressionInliner::visit(Swizzle &swizzle)
 
 void ExpressionInliner::visit(UnaryExpression &unary)
 {
-	SetFlag set_write(access_write, access_write || unary.oper->token[1]=='+' || unary.oper->token[1]=='-');
+	SetFlag set_write(access_write, (unary.oper->token[1]=='+' || unary.oper->token[1]=='-'));
 	visit(unary.expression);
 	r_trivial = false;
 }
@@ -428,10 +428,10 @@ void ExpressionInliner::visit(Assignment &assign)
 	r_trivial = true;
 	visit(assign.right);
 
-	auto i = assignments.find(assign.target);
+	auto i = assignments.find(assign.target.declaration);
 	if(i!=assignments.end())
 	{
-		if(iteration_body && i->second->expression)
+		if(iteration_body && i->second && i->second->expression)
 		{
 			/* Block inlining into previous references within the iteration
 			statement.  On iterations after the first they would refer to the
@@ -441,6 +441,10 @@ void ExpressionInliner::visit(Assignment &assign)
 					u.blocked = (k==iteration_body);
 		}
 
+		for(; (i!=assignments.end() && i->first.declaration==assign.target.declaration); ++i)
+			if(targets_overlap(i->first, assign.target))
+				i->second->blocked = true;
+
 		expressions.push_back(ExpressionInfo());
 		ExpressionInfo &info = expressions.back();
 		info.target = assign.target;
@@ -450,7 +454,7 @@ void ExpressionInliner::visit(Assignment &assign)
 		info.assign_scope = current_block;
 		info.trivial = r_trivial;
 
-		i->second = &info;
+		assignments[assign.target] = &info;
 	}
 
 	r_trivial = false;
@@ -1260,15 +1264,15 @@ bool UnusedVariableRemover::apply(Stage &s)
 
 	for(const auto &kvp: variables)
 	{
-		if(kvp.second.output)
+		if(!kvp.second.referenced)
+			unused_nodes.insert(kvp.first);
+		else if(kvp.second.output)
 		{
 			/* The last visible assignments of output variables are used by the
 			next stage or the API. */
 			for(AssignmentInfo *a: kvp.second.assignments)
 				unused_nodes.erase(a->node);
 		}
-		else if(!kvp.second.referenced)
-			unused_nodes.insert(kvp.first);
 	}
 
 	NodeRemover().apply(s, unused_nodes);
@@ -1284,36 +1288,12 @@ void UnusedVariableRemover::referenced(const Assignment::Target &target, Node &n
 	{
 		bool loop_external = false;
 		for(AssignmentInfo *a: var_info.assignments)
-		{
-			bool covered = true;
-			for(unsigned j=0; (covered && j<a->target.chain_len && j<target.chain_len); ++j)
-			{
-				Assignment::Target::ChainType type1 = static_cast<Assignment::Target::ChainType>(a->target.chain[j]&0xC0);
-				Assignment::Target::ChainType type2 = static_cast<Assignment::Target::ChainType>(target.chain[j]&0xC0);
-				unsigned index1 = a->target.chain[j]&0x3F;
-				unsigned index2 = target.chain[j]&0x3F;
-				if(type1==Assignment::Target::SWIZZLE || type2==Assignment::Target::SWIZZLE)
-				{
-					if(type1==Assignment::Target::SWIZZLE && type2==Assignment::Target::SWIZZLE)
-						covered = index1&index2;
-					else if(type1==Assignment::Target::ARRAY && index1<4)
-						covered = index2&(1<<index1);
-					else if(type2==Assignment::Target::ARRAY && index2<4)
-						covered = index1&(1<<index2);
-					/* If it's some other combination (shouldn't happen), leave
-					covered as true */
-				}
-				else
-					covered = (type1==type2 && (index1==index2 || index1==0x3F || index2==0x3F));
-			}
-
-			if(covered)
+			if(targets_overlap(a->target, target))
 			{
 				a->used_by.push_back(&node);
 				if(a->in_loop<in_loop)
 					loop_external = true;
 			}
-		}
 
 		if(loop_external)
 			loop_ext_refs.push_back(&node);
@@ -1324,7 +1304,7 @@ void UnusedVariableRemover::visit(VariableReference &var)
 {
 	if(composite_reference)
 		r_reference.declaration = var.declaration;
-	else
+	else if(var.declaration)
 		referenced(var.declaration, var);
 }
 
@@ -1332,7 +1312,7 @@ void UnusedVariableRemover::visit(InterfaceBlockReference &iface)
 {
 	if(composite_reference)
 		r_reference.declaration = iface.declaration;
-	else
+	else if(iface.declaration)
 		referenced(iface.declaration, iface);
 }
 
@@ -1384,6 +1364,7 @@ void UnusedVariableRemover::visit(BinaryExpression &binary)
 		{
 			SetFlag clear_assignment(assignment_target, false);
 			SetFlag clear_composite(composite_reference, false);
+			SetForScope<Assignment::Target> clear_reference(r_reference, Assignment::Target());
 			binary.right->visit(*this);
 		}
 
@@ -1490,6 +1471,10 @@ void UnusedVariableRemover::visit(VariableDeclaration &var)
 	graphics API. */
 	var_info.output = (var.interface=="out" && (stage->type==Stage::FRAGMENT || var.linked_declaration || !var.name.compare(0, 3, "gl_")));
 
+	// Linked outputs are automatically referenced.
+	if(var_info.output && var.linked_declaration)
+		var_info.referenced = true;
+
 	if(var.init_expression)
 	{
 		var_info.initialized = true;
@@ -1569,8 +1554,14 @@ void UnusedVariableRemover::visit(Iteration &iter)
 	vector<Node *> saved_refs;
 	swap(loop_ext_refs, saved_refs);
 	{
+		if(iter.init_statement)
+			iter.init_statement->visit(*this);
 		SetForScope<unsigned> set_loop(in_loop, in_loop+1);
-		TraversingVisitor::visit(iter);
+		if(iter.condition)
+			iter.condition->visit(*this);
+		iter.body.visit(*this);
+		if(iter.loop_expression)
+			iter.loop_expression->visit(*this);
 	}
 	swap(loop_ext_refs, saved_refs);