diff --git a/shadersource.cpp b/shadersource.cpp
index 95b722f..4910d10 100644
--- a/shadersource.cpp
+++ b/shadersource.cpp
@@ -13,17 +13,28 @@ Shader* ShaderSource::compile(int nbDefines = 0, const char** defines = NULL)
 {
     if(sources[VERTEX] == NULL || sources[FRAGMENT] == NULL)
         return NULL;
-    std::string plop(sources[VERTEX]);
-    plop.find("#if")
+    std::string compiledSources[NB_TYPES];
+    for(int i=0; i<NB_TYPES; ++i)
     {
-
+        if(sources[i] == NULL)
+            continue;
+        compiledSources[i] = std::string(sources[i]);
+        preprocess(compiledSources[i], nbDefines, defines);
     }
-
-    // read lines
-
-    else if(sources[GEOMETRY] != NULL)
-        return new Shader(sources[VERTEX], sources[GEOMETRY], sources[FRAGMENT]);
+    if(sources[GEOMETRY] != NULL)
+        return new Shader(compiledSources[VERTEX], compiledSources[GEOMETRY], compiledSources[FRAGMENT]);
     else
-        return new Shader(sources[VERTEX], sources[FRAGMENT]);
+        return new Shader(compiledSources[VERTEX], compiledSources[FRAGMENT]);
 }
 
+void ShaderSource::preprocess(std::string &source, int nbDefines, const char** defines)
+{
+    std::istringstream f("line1\nline2\nline3");
+    std::string line;
+    while (std::getline(f, line)) {
+        if(line.at(0) == '#')
+        {
+            // TODO
+        }
+    }
+}
diff --git a/shadersource.h b/shadersource.h
index 949db4e..3ea302d 100644
--- a/shadersource.h
+++ b/shadersource.h
@@ -24,6 +24,8 @@ public:
 
 private:
     char* sources[NB_TYPES];
+
+    void preprocess(std::string &source, int nbDefines, const char** defines);
 };
 
 #endif // SHADERSOURCE_H