Avoid relying `origin_upper_left`

It seems to cause considerable glitches when resizing.

1 files changed, 11 insertions, 0 deletions

diff --git a/glow/src/quad.rs b/glow/src/quad.rs
index fd71757f..acac3219 100644
--- a/glow/src/quad.rs
+++ b/glow/src/quad.rs
@@ -12,6 +12,7 @@ pub struct Pipeline {
     instances: <glow::Context as HasContext>::Buffer,
     current_transform: Transformation,
     current_scale: f32,
+    current_target_height: u32,
 }
 
 impl Pipeline {
@@ -35,6 +36,7 @@ impl Pipeline {
                 &Transformation::identity().into(),
             );
             gl.uniform_1_f32(Some(1), 1.0);
+            gl.uniform_1_f32(Some(2), 0.0);
 
             gl.use_program(None);
         }
@@ -48,6 +50,7 @@ impl Pipeline {
             instances,
             current_transform: Transformation::identity(),
             current_scale: 1.0,
+            current_target_height: 0,
         }
     }
 
@@ -94,6 +97,14 @@ impl Pipeline {
             self.current_scale = scale;
         }
 
+        if target_height != self.current_target_height {
+            unsafe {
+                gl.uniform_1_f32(Some(2), target_height as f32);
+            }
+
+            self.current_target_height = target_height;
+        }
+
         let mut i = 0;
         let total = instances.len();