From c2c0cf75855a1310aa7a7b7a00f940c12de5fb61 Mon Sep 17 00:00:00 2001
From: Lucas Schumacher <technolucas@protonmail.com>
Date: Sun, 5 May 2024 21:08:50 -0400
Subject: [PATCH] Add waterfall scrolling

---
 src/app/waterfall.rs | 7 ++++++-
 1 file changed, 6 insertions(+), 1 deletion(-)

diff --git a/src/app/waterfall.rs b/src/app/waterfall.rs
index db54f07..257fa99 100644
--- a/src/app/waterfall.rs
+++ b/src/app/waterfall.rs
@@ -79,6 +79,10 @@ impl Waterfall {
             );
             self.offset = (self.offset + 1) % 300;
 
+            if let Some(uniform) = gl.get_uniform_location(self.program, "offset") {
+                gl.uniform_1_f32(Some(&uniform), self.offset as f32 / 300.0);
+            }
+
             // Draw the elements
             gl.draw_elements(glow::TRIANGLES, 6, glow::UNSIGNED_INT, 0);
 
@@ -219,10 +223,11 @@ impl Waterfall {
 
                     // texture sampler
                     uniform sampler2D texture1;
+                    uniform float offset;
 
                     void main()
                     {
-                        FragColor = texture(texture1, TexCoord);
+                        FragColor = texture(texture1, vec2(TexCoord.x, TexCoord.y + offset));
                     }
                 "#,
             );