port from perforce

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

@@ -0,0 +1,13 @@
+uniform sampler2D tex; 
+uniform float ratio;
+uniform float factor;
+
+void main()
+{	
+	vec2 p = gl_TexCoord[0].xy;
+		
+	vec2 dist = (p - vec2(0.5, 0.5)) * vec2(1.0,ratio); 
+	vec4 darkF = vec4(max(0.0, 1.0 - factor * dot(dist,dist)));
+	
+	gl_FragColor = gl_Color * darkF *  texture2D(tex, p);
+}