X-Git-Url: http://git.tdb.fi/?a=blobdiff_plain;f=source%2Fcore%2Fprogram.cpp;h=c41976ed8eef270a238de46b837e529ad4904dd9;hb=143fed36e93eaa54345dbc5f66cc09e0f6be0519;hp=789fa32473392d75a0bd34a13aac7208ddf14637;hpb=c93e0613e96ec6817e26b533e90dc49d45787941;p=libs%2Fgl.git

diff --git a/source/core/program.cpp b/source/core/program.cpp
index 789fa324..c41976ed 100644
--- a/source/core/program.cpp
+++ b/source/core/program.cpp
@@ -80,6 +80,9 @@ Program::~Program()
 
 void Program::add_stages(const Module &mod, const map<string, int> &spec_values)
 {
+	if(!stage_ids.empty())
+		throw invalid_operation("Program::add_stages");
+
 	switch(mod.get_format())
 	{
 	case Module::GLSL: return add_glsl_stages(static_cast<const GlslModule &>(mod), spec_values);
@@ -220,6 +223,9 @@ void Program::bind_fragment_data(unsigned index, const string &name)
 
 void Program::link()
 {
+	if(stage_ids.empty())
+		throw invalid_operation("Program::link");
+
 	uniforms.clear();
 
 	glLinkProgram(id);