src/main.rs

@@ -302,8 +302,19 @@ fn main() {
                 simple_shader.activate();
                 // build and send the transform matrix (start from identity)
                 let mut transform: glm::Mat4 = glm::identity();
-                // modify element (0,0) here; change indices to test a, b, c, d, e, f, etc.
-                transform[(0,0)] = elapsed.sin(); 
+                // cycle through each transform parameter (a,b,c,d,e,f) over time
+                let cycle_duration = 2.0;
+                let idx = ((elapsed / cycle_duration).floor() as usize) % 6;
+                let v = elapsed.sin();
+                match idx {
+                    0 => transform[(0,0)] = v, // a
+                    1 => transform[(0,1)] = v, // b
+                    2 => transform[(0,3)] = v, // c
+                    3 => transform[(1,0)] = v, // d
+                    4 => transform[(1,1)] = v, // e
+                    5 => transform[(1,3)] = v, // f
+                    _ => {}
+                }
                 gl::UniformMatrix4fv(transform_loc, 1, gl::FALSE, transform.as_ptr());
                 gl::BindVertexArray(my_vao);
                 gl::DrawElements(