diff --git a/lib/renderer/g_buffer.rb b/lib/renderer/g_buffer.rb
index d683e61..33a2dfb 100644
--- a/lib/renderer/g_buffer.rb
+++ b/lib/renderer/g_buffer.rb
@@ -34,6 +34,14 @@ class IMICFPS
       create_screen_vbo
     end
 
+    def width
+      window.width
+    end
+
+    def height
+      window.height
+    end
+
     def create_framebuffer
       buffer = ' ' * 8
       glGenFramebuffers(1, buffer)
@@ -78,7 +86,7 @@ class IMICFPS
         @textures[@buffers[i]] = texture_id
 
         glBindTexture(GL_TEXTURE_2D, texture_id)
-        glTexImage2D(GL_TEXTURE_2D, 0, GL_RGB16F, window.width, window.height, 0, GL_RGB, GL_FLOAT, nil)
+        glTexImage2D(GL_TEXTURE_2D, 0, GL_RGB16F, width, height, 0, GL_RGB, GL_FLOAT, nil)
         glFramebufferTexture2D(GL_FRAMEBUFFER, GL_COLOR_ATTACHMENT0 + i, GL_TEXTURE_2D, texture_id, 0)
       end
 
@@ -88,7 +96,7 @@ class IMICFPS
       @textures[:depth] = texture_id
 
       glBindTexture(GL_TEXTURE_2D, texture_id)
-      glTexImage2D(GL_TEXTURE_2D, 0, GL_DEPTH_COMPONENT32F, window.width, window.height, 0, GL_DEPTH_COMPONENT, GL_FLOAT, nil)
+      glTexImage2D(GL_TEXTURE_2D, 0, GL_DEPTH_COMPONENT32F, width, height, 0, GL_DEPTH_COMPONENT, GL_FLOAT, nil)
       glFramebufferTexture2D(GL_FRAMEBUFFER, GL_DEPTH_ATTACHMENT, GL_TEXTURE_2D, texture_id, 0)
 
       draw_buffers = [ GL_COLOR_ATTACHMENT0, GL_COLOR_ATTACHMENT1, GL_COLOR_ATTACHMENT2, GL_COLOR_ATTACHMENT3 ]
diff --git a/lib/renderer/opengl_renderer.rb b/lib/renderer/opengl_renderer.rb
index 11b73e8..108a071 100644
--- a/lib/renderer/opengl_renderer.rb
+++ b/lib/renderer/opengl_renderer.rb
@@ -82,6 +82,12 @@ class IMICFPS
     end
 
     def lighting(lights)
+      @g_buffer.bind_for_reading
+
+      @g_buffer.set_read_buffer(:diffuse)
+      glBlitFramebuffer(0, 0, @g_buffer.width, @g_buffer.height,
+                        0, 0, @g_buffer.width / 2, @g_buffer.height / 2, 
+                        GL_COLOR_BUFFER_BIT, GL_LINEAR)
     end
 
     def post_processing
diff --git a/shaders/fragment/default.glsl b/shaders/fragment/default.glsl
index 3b2bd94..7b622ce 100644
--- a/shaders/fragment/default.glsl
+++ b/shaders/fragment/default.glsl
@@ -2,7 +2,8 @@
 
 @include "light_struct"
 
-layout(location = 0) out vec4 fragColor;
+// layout(location = 0) out vec4 fragColor;
+layout (location = 1) out vec3 fragColor;
 
 in vec3 outPosition;
 in vec3 outColor;
@@ -98,5 +99,5 @@ void main() {
     }
   }
 
-  fragColor = vec4(result, 1.0);
+  fragColor = vec3(1,1,1);//result;
 }
diff --git a/shaders/vertex/render_screen.glsl b/shaders/vertex/render_screen.glsl
index 6acd275..d032ce4 100644
--- a/shaders/vertex/render_screen.glsl
+++ b/shaders/vertex/render_screen.glsl
@@ -1,5 +1,5 @@
 #version 330 core
-layout (location = 0) in vec2 inPosition;
+layout (location = 0) in vec3 inPosition;
 layout (location = 1) in vec2 inTexCoords;
 
 out vec2 outTexCoords;