From 41d0819814663a87ccc8951f5a954d4ce43bf5d3 Mon Sep 17 00:00:00 2001
From: Adrian G L <adrian@lauterer.it>
Date: Mon, 15 Sep 2025 13:29:57 +0200
Subject: [PATCH] refactor: simplify VertexAttribPointer call and update
 vertex, color, index data with alpha transparency and z-depth

---
 src/main.rs | 50 +++++++++++++-------------------------------------
 1 file changed, 13 insertions(+), 37 deletions(-)

diff --git a/src/main.rs b/src/main.rs
index 96969b3..313c584 100644
--- a/src/main.rs
+++ b/src/main.rs
@@ -105,14 +105,7 @@ unsafe fn create_vao(vertices: &Vec<f32>, colors: &Vec<f32>, indices: &Vec<u32>)
         colors.as_ptr() as *const c_void,
         gl::STATIC_DRAW,
     );
-    gl::VertexAttribPointer(
-        1,
-        4,
-        gl::FLOAT,
-        gl::FALSE,
-        0,
-        std::ptr::null(),
-    );
+    gl::VertexAttribPointer(1, 4, gl::FLOAT, gl::FALSE, 0, std::ptr::null());
     gl::EnableVertexAttribArray(1);
 
     vao_id
@@ -189,38 +182,21 @@ fn main() {
         // == // Set up your VAO around here
 
         let vertices = vec![
-            // triangle 1
-            -0.8, -0.8, 0.0,
-            -0.2, -0.8, 0.0,
-            -0.5, -0.2, 0.0,
-            // triangle 2
-            0.2, -0.8, 0.0,
-            0.8, -0.8, 0.0,
-            0.5, -0.2, 0.0,
-            // triangle 3
-            -0.3,  0.2, 0.0,
-            0.3,   0.2, 0.0,
-            0.0,   0.8, 0.0,
-        ];
-        let indices = vec![
-            0, 1, 2,
-            3, 4, 5,
-            6, 7, 8,
+            // triangle 1 (red, z=0.5)
+            -0.6, -0.3, 0.5, 0.6, -0.3, 0.5, 0.0, 0.6, 0.5, // triangle 2 (green, z=0.0)
+            -0.3, -0.6, 0.0, 0.3, -0.6, 0.0, 0.0, 0.3, 0.0, // triangle 3 (blue, z=-0.5)
+            -0.4, 0.4, -0.5, 0.4, 0.4, -0.5, 0.0, -0.4, -0.5,
         ];
+        let indices = vec![0, 1, 2, 3, 4, 5, 6, 8, 7];
         let colors = vec![
-            // triangle 1 colors
-            1.0, 0.0, 0.0, 1.0,
-            0.0, 1.0, 0.0, 1.0,
-            0.0, 0.0, 1.0, 1.0,
-            // triangle 2 colors
-            1.0, 1.0, 0.0, 1.0,
-            0.0, 1.0, 1.0, 1.0,
-            1.0, 0.0, 1.0, 1.0,
-            // triangle 3 colors
-            0.5, 0.5, 0.5, 1.0,
-            1.0, 0.5, 0.0, 1.0,
-            0.0, 0.5, 1.0, 1.0,
+            // triangle 1 colors (red, α=0.5)
+            1.0, 0.0, 0.0, 0.3, 1.0, 0.0, 0.0, 0.3, 1.0, 0.0, 0.0, 0.3,
+            // triangle 2 colors (green, α=0.5)
+            0.0, 1.0, 0.0, 0.3, 0.0, 1.0, 0.0, 0.3, 0.0, 1.0, 0.0, 0.3,
+            // triangle 3 colors (blue, α=0.5)
+            0.0, 0.0, 1.0, 0.3, 0.0, 0.0, 1.0, 0.3, 0.0, 0.0, 1.0, 0.3,
         ];
+
         let my_vao = unsafe { create_vao(&vertices, &colors, &indices) };
 
         // == // Set up your shaders here