diff --git a/src/fmri/DummyLayerVisualisation.hpp b/src/fmri/DummyLayerVisualisation.hpp
index 6ca5a9e..a19c7bd 100644
--- a/src/fmri/DummyLayerVisualisation.hpp
+++ b/src/fmri/DummyLayerVisualisation.hpp
@@ -10,7 +10,7 @@ namespace fmri
     class DummyLayerVisualisation : public LayerVisualisation
     {
     public:
-        void draw(float time) override
+        void draw(float) override
         {};
     };
 }
diff --git a/src/fmri/InputLayerVisualisation.cpp b/src/fmri/InputLayerVisualisation.cpp
index 531ea3b..e083f17 100644
--- a/src/fmri/InputLayerVisualisation.cpp
+++ b/src/fmri/InputLayerVisualisation.cpp
@@ -4,7 +4,6 @@
 #include <opencv2/core.hpp>
 #include "InputLayerVisualisation.hpp"
 #include "Range.hpp"
-#include "RenderingState.hpp"
 #include "glutils.hpp"
 
 using namespace fmri;
@@ -67,7 +66,7 @@ InputLayerVisualisation::InputLayerVisualisation(const LayerData &data)
     gluBuild2DMipmaps(GL_TEXTURE_2D, GL_RGB, width, height, GL_RGB, GL_FLOAT, imageData.data());
 }
 
-void InputLayerVisualisation::draw(float time)
+void InputLayerVisualisation::draw(float)
 {
     const float vertices[] = {
             0, 0, 0,
@@ -83,7 +82,7 @@ void InputLayerVisualisation::draw(float time)
             0, 0,
     };
 
-    float alpha = RenderingState::instance().layerAlpha();
+    float alpha = getAlpha();
 
     drawImageTiles(4, vertices, texCoords, texture, alpha);
 }