diff --git a/modules/game_shaders/map.frag b/modules/game_shaders/map.frag
index f407109c..233d6903 100644
--- a/modules/game_shaders/map.frag
+++ b/modules/game_shaders/map.frag
@@ -4,7 +4,25 @@ uniform float time; // time in seconds since shader linkage
 uniform sampler2D texture; // map texture
 varying vec2 textureCoords; // map texture coords
 
+/*
 void main()
 {
     gl_FragColor = texture2D(texture, textureCoords) * color * opacity;
 }
+*/
+void main()
+{
+   vec4 sum = vec4(0);
+   vec2 texcoord = textureCoords;
+   int j;
+   int i;
+
+   for( i= -4 ;i < 4; i++)
+   {
+        for (j = -4; j < 4; j++)
+        {
+            sum += texture2D(texture, texcoord + vec2(j, i)*0.0005) * 0.008;
+        }
+   }
+   gl_FragColor = texture2D(texture, textureCoords) * color * opacity + sum;
+}
diff --git a/src/framework/graphics/graphics.cpp b/src/framework/graphics/graphics.cpp
index f58da236..671c9d48 100644
--- a/src/framework/graphics/graphics.cpp
+++ b/src/framework/graphics/graphics.cpp
@@ -49,6 +49,7 @@ void Graphics::init()
 #endif
 
     glEnable(GL_BLEND);
+    glClear(GL_ACCUM_BUFFER_BIT);
 
     m_emptyTexture = TexturePtr(new Texture);
 
@@ -82,6 +83,7 @@ bool Graphics::parseOption(const std::string& option)
 void Graphics::resize(const Size& size)
 {
     setViewportSize(size);
+    glClear(GL_ACCUM_BUFFER_BIT);
 
     // The projection matrix converts from Painter's coordinate system to GL's coordinate system
     //    * GL's viewport is 2x2, Painter's is width x height
@@ -111,16 +113,14 @@ void Graphics::beginRender()
 
 void Graphics::endRender()
 {
-    /*
     // this is a simple blur effect
     static Timer timer;
-    if(timer.ticksElapsed() >= 20) {
+    if(timer.ticksElapsed() >= 15) {
         glAccum(GL_MULT, 0.8);
         glAccum(GL_ACCUM, 0.2);
         timer.restart();
     }
     glAccum(GL_RETURN, 1);
-    */
 }
 
 void Graphics::beginClipping(const Rect& clipRect)
diff --git a/src/framework/platform/x11window.cpp b/src/framework/platform/x11window.cpp
index 7a45e1b9..2ffa253a 100644
--- a/src/framework/platform/x11window.cpp
+++ b/src/framework/platform/x11window.cpp
@@ -367,7 +367,10 @@ void X11Window::internalChooseGLVisual()
         GLX_USE_GL,
         GLX_RGBA,
         GLX_DOUBLEBUFFER,
-        GLX_STENCIL_SIZE, 1,
+        GLX_ACCUM_RED_SIZE, 8,
+        GLX_ACCUM_GREEN_SIZE, 8,
+        GLX_ACCUM_BLUE_SIZE, 8,
+        GLX_ACCUM_ALPHA_SIZE, 8,
         None
     };