X-Git-Url: http://git.tdb.fi/?p=libs%2Fgl.git;a=blobdiff_plain;f=source%2Fglsl%2Ffinalize.cpp;h=fb136e33c7dbc79fd03706ba6ef3450d4906fe5c;hp=29eef60fb3342d12c31374441ed7a076d343ea2c;hb=acd7bb6e23e2aff9934ecf32852c62ba72c13574;hpb=6211e1556df8345ad1c4e7edbd635bccdd7f54f0

diff --git a/source/glsl/finalize.cpp b/source/glsl/finalize.cpp
index 29eef60f..fb136e33 100644
--- a/source/glsl/finalize.cpp
+++ b/source/glsl/finalize.cpp
@@ -239,6 +239,56 @@ void LocationAllocator::visit(VariableDeclaration &var)
 }
 
 
+void DepthRangeConverter::apply(Stage &stage, const Features &features)
+{
+	if(stage.type!=Stage::VERTEX || features.target_api==VULKAN)
+		return;
+
+	stage.content.visit(*this);
+}
+
+void DepthRangeConverter::visit(FunctionDeclaration &func)
+{
+	if(func.definition==&func && func.name=="main")
+	{
+		VariableReference *position = new VariableReference;
+		position->name = "gl_Position";
+
+		MemberAccess *z = new MemberAccess;
+		z->left = position;
+		z->member = "z";
+
+		Literal *scale = new Literal;
+		scale->token = "2.0";
+		scale->value = 2.0f;
+
+		BinaryExpression *multiply = new BinaryExpression;
+		multiply->oper = &Operator::get_operator("*", Operator::BINARY);
+		multiply->left = z;
+		multiply->right = scale;
+
+		MemberAccess *w = new MemberAccess;
+		w->left = position->clone();
+		w->member = "w";
+
+		BinaryExpression *subtract = new BinaryExpression;
+		subtract->oper = &Operator::get_operator("-", Operator::BINARY);
+		subtract->left = multiply;
+		subtract->right = w;
+
+		Assignment *assign = new Assignment;
+		assign->oper = &Operator::get_operator("=", Operator::BINARY);
+		assign->left = z->clone();
+		assign->right = subtract;
+
+		ExpressionStatement *statement = new ExpressionStatement;
+		statement->expression = assign;
+
+		func.body.body.push_back(statement);
+	}
+}
+
+
 void PrecisionConverter::apply(Stage &s)
 {
 	stage = &s;