extended postfx and sniper hud fix

src/extras/shaders/im2d.vert

@@ -0,0 +1,21 @@
+uniform vec4 u_xform;
+
+layout(location = 0) in vec4 in_pos;
+layout(location = 2) in vec4 in_color;
+layout(location = 3) in vec2 in_tex0;
+
+out vec4 v_color;
+out vec2 v_tex0;
+out float v_fog;
+
+void
+main(void)
+{
+	gl_Position = in_pos;
+	gl_Position.w = 1.0;
+	gl_Position.xy = gl_Position.xy * u_xform.xy + u_xform.zw;
+	v_fog = DoFog(gl_Position.z);
+	gl_Position.xyz *= gl_Position.w;
+	v_color = in_color;
+	v_tex0 = in_tex0;
+}