port from perforce

hgplus/ShaderMinifier/tests/real/extatique/snake.fs

@@ -0,0 +1,18 @@
+varying vec3 normal;
+varying float profondeur;
+
+vec4 desaturate(vec4 color, float t)
+{
+	vec3 grey = vec3(dot(vec3(0.33), color.rgb));
+	return vec4(mix(color.rgb, grey, t), color.a);
+}
+
+void main()
+{	
+	vec3 N = normal;
+	
+	vec3 e = vec3(0.0,0.0,-1.0);
+	float diffuse = max(0.0, dot(N, e));
+	vec4 C = gl_Color * vec4(0.1 + 0.9 * vec3(diffuse), diffuse);  
+	gl_FragColor = C * exp( -profondeur * 0.1  );
+}