From d77492c0c37dec1207049b340a318e263cb96b82 Mon Sep 17 00:00:00 2001
From: Héctor Ramón Jiménez <hector0193@gmail.com>
Date: Thu, 21 May 2020 01:01:47 +0200
Subject: Avoid relying `origin_upper_left`

It seems to cause considerable glitches when resizing.
---
 glow/src/quad.rs | 11 +++++++++++
 1 file changed, 11 insertions(+)

(limited to 'glow/src/quad.rs')

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();
 
-- 
cgit