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--- a/demo/simple.cpp
+++ b/demo/simple.cpp
@@ -105,14 +105,14 @@
     float t2 = sin(n / 50 + 1);
     float t3 = sin(n / 30 + 2);
 
-    float ambient[4]  = { (t1 + 2.0) / 3,
-                          (t2 + 2.0) / 3,
-                          (t3 + 2.0) / 3, 0.3 };
-    float diffuse[4]  = { 1.0, 0.9, 0.9, 1.0 };
-    float specular[4] = { 1.0, 0.7, 0.7, 1.0 };
-    float position[4] = { 100.0, 100.0, 0.0, 1.0 };
+    float ambient[4]  = { (t1 + 2.0f) / 3,
+                          (t2 + 2.0f) / 3,
+                          (t3 + 2.0f) / 3, 0.3 };
+    float diffuse[4]  = { 1.0f, 0.9f, 0.9f, 1.0f };
+    float specular[4] = { 1.0f, 0.7f, 0.7f, 1.0f };
+    float position[4] = { 100.0f, 100.0f, 0.0f, 1.0f };
 
-    float front_ambient[4]  = { 0.7, 0.7, 0.7, 0.0 };
+    float front_ambient[4]  = { 0.7f, 0.7f, 0.7f, 0.0f };
 
     glClear(GL_COLOR_BUFFER_BIT | GL_DEPTH_BUFFER_BIT);