diff --git a/samples/bin/datas/shader/blur.sfx b/samples/bin/datas/shader/blur.sfx
index 4c9f11285..c856e3320 100644
--- a/samples/bin/datas/shader/blur.sfx
+++ b/samples/bin/datas/shader/blur.sfx
@@ -6,11 +6,15 @@ void main()
 	vec2 offx = vec2(offset, 0.0);
 	vec2 offy = vec2(0.0, offset);
 
-	vec4 c0 = texture2D(texture, gl_TexCoord[0].xy);
-	vec4 c1 = texture2D(texture, gl_TexCoord[0].xy - offy);
-	vec4 c2 = texture2D(texture, gl_TexCoord[0].xy + offy);
-	vec4 c3 = texture2D(texture, gl_TexCoord[0].xy - offx);
-	vec4 c4 = texture2D(texture, gl_TexCoord[0].xy + offx);
+	vec4 pixel = texture2D(texture, gl_TexCoord[0].xy)               * 1 +
+                 texture2D(texture, gl_TexCoord[0].xy - offx)        * 2 +
+                 texture2D(texture, gl_TexCoord[0].xy + offx)        * 2 +
+                 texture2D(texture, gl_TexCoord[0].xy - offy)        * 2 +
+                 texture2D(texture, gl_TexCoord[0].xy + offy)        * 2 +
+                 texture2D(texture, gl_TexCoord[0].xy - offx - offy) * 1 +
+                 texture2D(texture, gl_TexCoord[0].xy - offx + offy) * 1 +
+                 texture2D(texture, gl_TexCoord[0].xy + offx - offy) * 1 +
+                 texture2D(texture, gl_TexCoord[0].xy + offx + offy) * 1;
 
-	gl_FragColor =  gl_Color * (c0 * 0.2 + c1 * 0.2 + c2 * 0.2 + c3 * 0.2 + c4 * 0.2);
+	gl_FragColor =  gl_Color * (pixel / 13.0);
 }
diff --git a/samples/bin/datas/shader/edge.sfx b/samples/bin/datas/shader/edge.sfx
new file mode 100644
index 000000000..ce0d99c61
--- /dev/null
+++ b/samples/bin/datas/shader/edge.sfx
@@ -0,0 +1,30 @@
+uniform sampler2D texture;
+uniform float threshold;
+
+void main()
+{
+    const float offset = 1.0 / 512.0;
+	vec2 offx = vec2(offset, 0.0);
+	vec2 offy = vec2(0.0, offset);
+
+	vec4 hEdge = texture2D(texture, gl_TexCoord[0].xy - offy)        * -2.0 +
+                 texture2D(texture, gl_TexCoord[0].xy + offy)        *  2.0 +
+                 texture2D(texture, gl_TexCoord[0].xy - offx - offy) * -1.0 +
+                 texture2D(texture, gl_TexCoord[0].xy - offx + offy) *  1.0 +
+                 texture2D(texture, gl_TexCoord[0].xy + offx - offy) * -1.0 +
+                 texture2D(texture, gl_TexCoord[0].xy + offx + offy) *  1.0;
+
+	vec4 vEdge = texture2D(texture, gl_TexCoord[0].xy - offx)        *  2.0 +
+                 texture2D(texture, gl_TexCoord[0].xy + offx)        * -2.0 +
+                 texture2D(texture, gl_TexCoord[0].xy - offx - offy) *  1.0 +
+                 texture2D(texture, gl_TexCoord[0].xy - offx + offy) * -1.0 +
+                 texture2D(texture, gl_TexCoord[0].xy + offx - offy) *  1.0 +
+                 texture2D(texture, gl_TexCoord[0].xy + offx + offy) * -1.0;
+
+    float edge = sqrt(hEdge.rgb * hEdge.rgb + vEdge.rgb * vEdge.rgb);
+    if (edge > threshold)
+        gl_FragColor.rgb = vec3(0, 0, 0);
+    else
+        gl_FragColor.rgb = vec3(1, 1, 1);
+	gl_FragColor.a = gl_Color.a * texture2D(texture, gl_TexCoord[0].xy).a;
+}