update

resources/shaders/options_110.vs

@@ -0,0 +1,22 @@
+#version 110
+
+uniform bool use_fixed_screen_size;
+uniform float zoom;
+uniform float point_size;
+uniform float near_plane_height;
+
+float fixed_screen_size()
+{
+    return point_size;
+}
+
+float fixed_world_size()
+{
+    return (gl_Position.w == 1.0) ? zoom * near_plane_height * point_size : near_plane_height * point_size / gl_Position.w;
+}
+
+void main()
+{
+    gl_Position = ftransform();
+    gl_PointSize = use_fixed_screen_size ? fixed_screen_size() : fixed_world_size();
+}