diff --git a/config.h b/config.h
index 7054520099..5f9ac0e897 100644
--- a/config.h
+++ b/config.h
@@ -65,7 +65,7 @@ static const bool vsync = true;
 static const bool video_smooth = false;
 
 // Path to custom Cg shader. If using custom shaders, it is recommended to disable video_smooth.
-static const char *cg_shader_path = "hqflt/hq2x.cg";
+static const char *cg_shader_path = "hqflt/scanline.cg";
 
 // On resize and fullscreen, rendering area will stay 4:3
 static const bool force_aspect = true; 
diff --git a/gl.c b/gl.c
index e73c23bcb6..7b3b778a8c 100644
--- a/gl.c
+++ b/gl.c
@@ -164,6 +164,7 @@ static void GLFWCALL resize(int width, int height)
 {
    glMatrixMode(GL_PROJECTION);
    glLoadIdentity();
+   GLuint out_width = width, out_height = height;
 
    if ( keep_aspect )
    {
@@ -176,12 +177,14 @@ static void GLFWCALL resize(int width, int height)
       {
          float delta = (desired_aspect / device_aspect - 1.0) / 2.0 + 0.5;
          glViewport(width * (0.5 - delta), 0, 2.0 * width * delta, height);
+         out_width = (int)(2.0 * width * delta);
       }
 
       else if ( (int)(device_aspect*1000) < (int)(desired_aspect*1000) )
       {
          float delta = (device_aspect / desired_aspect - 1.0) / 2.0 + 0.5;
          glViewport(0, height * (0.5 - delta), width, 2.0 * height * delta);
+         out_height = (int)(2.0 * height * delta);
       }
       else
          glViewport(0, 0, width, height);
@@ -195,8 +198,8 @@ static void GLFWCALL resize(int width, int height)
 #ifdef HAVE_CG
    cgGLSetStateMatrixParameter(cg_mvp_matrix, CG_GL_MODELVIEW_PROJECTION_MATRIX, CG_GL_MATRIX_IDENTITY);
 #endif
-   gl_width = width;
-   gl_height = height;
+   gl_width = out_width;
+   gl_height = out_height;
 }
 
 static float tv_to_fps(const struct timeval *tv, const struct timeval *new_tv, int frames)
diff --git a/hqflt/scanline.cg b/hqflt/scanline.cg
new file mode 100644
index 0000000000..611382ea61
--- /dev/null
+++ b/hqflt/scanline.cg
@@ -0,0 +1,46 @@
+
+/* Default Vertex shader */
+void main_vertex
+(
+	float4 position	: POSITION,
+	float4 color	: COLOR,
+	float2 texCoord : TEXCOORD0,
+
+    uniform float4x4 modelViewProj,
+
+	out float4 oPosition : POSITION,
+	out float4 oColor    : COLOR,
+	out float2 otexCoord : TEXCOORD
+)
+{
+	oPosition = mul(modelViewProj, position);
+	oColor = color;
+	otexCoord = texCoord;
+}
+
+
+struct output 
+{
+  float4 color    : COLOR;
+};
+
+struct input
+{
+  float2 video_size;
+  float2 texture_size;
+  float2 output_size;
+};
+
+output main_fragment(float2 texCoord : TEXCOORD0, uniform sampler2D decal : TEXUNIT0, uniform input IN)
+{
+	output OUT;
+   	
+	float winHeight = IN.output_size.y;
+   float4 tex_color = tex2D(decal, texCoord);
+   	
+	OUT.color = (1.0 - 0.60 * floor(fmod(texCoord.y * winHeight, 2.0))) * tex_color;
+	
+	return OUT;   	
+}
+
+