1 files changed, 31 insertions, 0 deletions
diff --git a/headtrack_stereo_demo/shaders/greyscale.frag b/headtrack_stereo_demo/shaders/greyscale.frag
new file mode 100644
index 0000000..6ed03e3
--- /dev/null
+++ b/headtrack_stereo_demo/shaders/greyscale.frag
@@ -0,0 +1,31 @@
+varying vec4 diffuse,ambient;
+	varying vec3 normal,lightDir,halfVector;
+	
+	
+	void main()
+	{
+		vec3 n,halfV;
+		float NdotL,NdotHV;
+		
+		/* The ambient term will always be present */
+		vec4 color = ambient;
+		
+		/* a fragment shader can't write a varying variable, hence we need
+		a new variable to store the normalized interpolated normal */
+		n = normalize(normal);
+		
+		/* compute the dot product between normal and ldir */
+		NdotL = max(dot(n,lightDir),0.0);
+		if (NdotL > 0.0) {
+			color += diffuse * NdotL;
+			halfV = normalize(halfVector);
+			NdotHV = max(dot(n,halfV),0.0);
+			color += gl_FrontMaterial.specular * 
+					gl_LightSource[0].specular * 
+					pow(NdotHV, gl_FrontMaterial.shininess);
+		}
+	
+		float gray = dot(color, vec3(0.299, 0.587, 0.114));
+
+		gl_FragColor = vec4(gray, gray, gray, color[3]);;
+}
+\ No newline at end of file