disable unneeded depth testing. enable antialiasing and alpha blending

docs/TODO_ux.md

@@ -66,6 +66,8 @@
 ## Switch to OpenGL (for speed)
 
 - get things running again
+	- editor is very slow... why?
+	- colors still seem off
 	- circles, arrows, other disabled things
 	- forking
 	- render text

ezgui/src/lib.rs

@@ -113,11 +113,7 @@ impl<'a> GfxCtx<'a> {
         program: &'a glium::Program,
     ) -> GfxCtx<'a> {
         let params = glium::DrawParameters {
-            depth: glium::Depth {
-                test: glium::DepthTest::IfLess,
-                write: true,
-                ..Default::default()
-            },
+            blend: glium::Blend::alpha_blending(),
             ..Default::default()
         };
 
@@ -152,7 +148,7 @@ impl<'a> GfxCtx<'a> {
 
     pub fn clear(&mut self, color: Color) {
         self.target
-            .clear_color_and_depth((color.0[0], color.0[1], color.0[2], color.0[3]), 1.0);
+            .clear_color(color.0[0], color.0[1], color.0[2], color.0[3]);
     }
 
     // Use graphics::Line internally for now, but make it easy to switch to something else by

ezgui/src/runner.rs

@@ -251,7 +251,8 @@ pub fn run<T, G: GUI<T>>(mut gui: G, window_title: &str) {
             gui.get_mut_canvas().window_width,
             gui.get_mut_canvas().window_height,
         ));
-    let context = glutin::ContextBuilder::new().with_depth_buffer(24);
+    // 2 looks bad, 4 looks fine
+    let context = glutin::ContextBuilder::new().with_multisampling(4);
     let display = glium::Display::new(window, context, &events_loop).unwrap();
     let program = glium::Program::from_source(
         &display,