diff --git a/java/examples/Demos/Graphics/Ribbons/Ribbons.pde b/java/examples/Demos/Graphics/Ribbons/Ribbons.pde
index 56acf978a..e581e8114 100644
--- a/java/examples/Demos/Graphics/Ribbons/Ribbons.pde
+++ b/java/examples/Demos/Graphics/Ribbons/Ribbons.pde
@@ -31,6 +31,7 @@ void setup() {
 void draw() {
   background(0);
    
+  ambient(80);   
   lights();
    
   translate(width/2, height/2, 200);
@@ -47,4 +48,4 @@ void mousePressed(){
 
 void mouseDragged(){
   arcball.mouseDragged();
-}
+}
diff --git a/java/examples/Topics/Shaders/Deform/data/deform.glsl b/java/examples/Topics/Shaders/Deform/data/deform.glsl
index 0b9bffb5d..a654e3699 100644
--- a/java/examples/Topics/Shaders/Deform/data/deform.glsl
+++ b/java/examples/Topics/Shaders/Deform/data/deform.glsl
@@ -1,3 +1,8 @@
+#ifdef GL_ES
+precision mediump float;
+precision mediump int;
+#endif
+
 uniform sampler2D textureSampler;
 
 uniform float time;
diff --git a/java/examples/Topics/Shaders/ImageMask/data/mask.glsl b/java/examples/Topics/Shaders/ImageMask/data/mask.glsl
index e4d0dbb26..115939fcc 100644
--- a/java/examples/Topics/Shaders/ImageMask/data/mask.glsl
+++ b/java/examples/Topics/Shaders/ImageMask/data/mask.glsl
@@ -1,3 +1,8 @@
+#ifdef GL_ES
+precision mediump float;
+precision mediump int;
+#endif
+
 uniform sampler2D textureSampler;
 uniform sampler2D maskSampler;
 
diff --git a/java/examples/Topics/Shaders/ToonShading/data/ToonFrag.glsl b/java/examples/Topics/Shaders/ToonShading/data/ToonFrag.glsl
index bb1c72971..054bb0dfb 100644
--- a/java/examples/Topics/Shaders/ToonShading/data/ToonFrag.glsl
+++ b/java/examples/Topics/Shaders/ToonShading/data/ToonFrag.glsl
@@ -1,3 +1,8 @@
+#ifdef GL_ES
+precision mediump float;
+precision mediump int;
+#endif
+
 varying vec3 vertNormal;
 varying vec3 vertLightDir;
 
diff --git a/java/examples/Topics/Textures/TextureCube/TextureCube.pde b/java/examples/Topics/Textures/TextureCube/TextureCube.pde
index 980cd0eec..262d9a0bb 100644
--- a/java/examples/Topics/Textures/TextureCube/TextureCube.pde
+++ b/java/examples/Topics/Textures/TextureCube/TextureCube.pde
@@ -17,7 +17,7 @@ float roty = PI/4;
 void setup() {
   size(640, 360, P3D);
   tex = loadImage("berlin-1.jpg");
-  textureMode(NORMALIZED);
+  textureMode(NORMAL);
   fill(255);
   stroke(color(44,48,32));
 }
@@ -88,4 +88,4 @@ void mouseDragged() {
   float rate = 0.01;
   rotx += (pmouseY-mouseY) * rate;
   roty += (mouseX-pmouseX) * rate;
-}
+}