X-Git-Url: http://git.tdb.fi/?a=blobdiff_plain;f=source%2Fglsl%2Foptimize.h;h=c932767e99807325f159372e626895aafa213c5b;hb=1cd0ea7f79b2b0dedd8a2a6622e5d2e8b2ea2512;hp=28f5e87688629634f9e05734e61cdbc1c5995ad1;hpb=a628f832b651df6643654d6e4a593c8c52417e67;p=libs%2Fgl.git

diff --git a/source/glsl/optimize.h b/source/glsl/optimize.h
index 28f5e876..c932767e 100644
--- a/source/glsl/optimize.h
+++ b/source/glsl/optimize.h
@@ -98,26 +98,69 @@ private:
 	virtual void visit(Return &);
 };
 
+/** Inlines variables into expressions.  Variables with trivial values (those
+consisting of a single literal or variable reference) are always inlined.
+Variables which are only referenced once are also inlined. */
+class ExpressionInliner: private TraversingVisitor
+{
+private:
+	struct ExpressionInfo
+	{
+		Expression *expression;
+		Block *assign_scope;
+		RefPtr<Expression> *inline_point;
+		const Operator *inner_oper;
+		const Operator *outer_oper;
+		bool inline_on_rhs;
+		bool trivial;
+		bool available;
+
+		ExpressionInfo();
+	};
+
+	std::map<VariableDeclaration *, ExpressionInfo> expressions;
+	ExpressionInfo *r_ref_info;
+	bool r_any_inlined;
+	bool r_trivial;
+	bool mutating;
+	bool iteration_init;
+	Block *iteration_body;
+	const Operator *r_oper;
+
+public:
+	ExpressionInliner();
+
+	bool apply(Stage &);
+
+private:
+	void visit_and_record(RefPtr<Expression> &, const Operator *, bool);
+	void inline_expression(Expression &, RefPtr<Expression> &, const Operator *, const Operator *, bool);
+	virtual void visit(Block &);
+	virtual void visit(VariableReference &);
+	virtual void visit(MemberAccess &);
+	virtual void visit(UnaryExpression &);
+	virtual void visit(BinaryExpression &);
+	virtual void visit(Assignment &);
+	virtual void visit(FunctionCall &);
+	virtual void visit(VariableDeclaration &);
+	virtual void visit(Conditional &);
+	virtual void visit(Iteration &);
+	virtual void visit(Return &);
+};
+
 /** Removes conditional statements and loops where the condition can be
 determined as constant at compile time. */
 class ConstantConditionEliminator: private TraversingVisitor
 {
 private:
-	bool record_only;
-	ExpressionEvaluator::ValueMap variable_values;
 	NodeList<Statement>::iterator insert_point;
 	std::set<Node *> nodes_to_remove;
 
 public:
-	ConstantConditionEliminator();
-
 	void apply(Stage &);
 
 private:
 	virtual void visit(Block &);
-	virtual void visit(UnaryExpression &);
-	virtual void visit(Assignment &);
-	virtual void visit(VariableDeclaration &);
 	virtual void visit(Conditional &);
 	virtual void visit(Iteration &);
 };