fix square filter, arrow keys on windows

uw8-window/src/gpu/mod.rs

@@ -126,15 +126,17 @@ impl Window {
                     WindowEvent::KeyboardInput { input, .. } => {
                         fn gamepad_button(input: &winit::event::KeyboardInput) -> u32 {
                             match input.scancode {
-                                103 => 1,
-                                108 => 2,
-                                105 => 4,
-                                106 => 8,
                                 44 => 16,
                                 45 => 32,
                                 30 => 64,
                                 31 => 128,
+                                _ => match input.virtual_keycode {
+                                    Some(VirtualKeyCode::Up) => 1,
+                                    Some(VirtualKeyCode::Down) => 2,
+                                    Some(VirtualKeyCode::Left) => 4,
+                                    Some(VirtualKeyCode::Right) => 8,
                                     _ => 0,
+                                },
                             }
                         }
                         if input.state == winit::event::ElementState::Pressed {

uw8-window/src/gpu/square.wgsl

@@ -32,7 +32,7 @@ fn aa_tex_coord(c: f32) -> f32 {
     let center = base + 0.5;
     let next = base + 1.0;
     if high > next {
-        return center + (high - next) / (high - base);
+        return center + (high - next) / (high - low);
     } else {
         return center;
     }