From 311eb0227c4317aef29fd7d7837e49c25bd53734 Mon Sep 17 00:00:00 2001
From: Dane Johnson <dane@danejohnson.org>
Date: Wed, 6 Apr 2022 17:16:24 -0500
Subject: [PATCH] Draw some pretty colors

---
 src/main.rs | 47 ++++++++++++++++++++++++++++++++++++++++++++++-
 1 file changed, 46 insertions(+), 1 deletion(-)

diff --git a/src/main.rs b/src/main.rs
index f10d89a..caea7ba 100644
--- a/src/main.rs
+++ b/src/main.rs
@@ -1,5 +1,14 @@
+#[macro_use]
 extern crate glium;
 
+#[derive(Copy, Clone)]
+struct Vertex {
+    position: [f32; 2],
+    color: [f32; 3],
+}
+
+implement_vertex!(Vertex, position, color);
+
 fn main() {
     use glium::{glutin, Surface};
     
@@ -10,12 +19,48 @@ fn main() {
 
     let display = glium::Display::new(wb, cb, &events_loop).unwrap();
 
+    let vertex1 = Vertex { position: [-0.5, -0.5], color: [1.0, 0.0, 0.0] };
+    let vertex2 = Vertex { position: [ 0.0,  0.5], color: [0.0, 1.0, 0.0] };
+    let vertex3 = Vertex { position: [ 0.5, -0.25], color: [0.0, 0.0, 1.0]};
+    let shape = vec![vertex1, vertex2, vertex3];
+
+    let vertex_buffer = glium::VertexBuffer::new(&display, &shape).unwrap();
+    let indices = glium::index::NoIndices(glium::index::PrimitiveType::TrianglesList);
+
+    let vertex_shader_src = r#"
+    #version 330
+
+    in vec2 position;
+    in vec3 color;
+
+    out vec3 DIFFUSE;
+
+    void main() {
+        gl_Position = vec4(position, 0.0, 1.0);
+        DIFFUSE = color;
+    }
+"#;
+    let fragment_shader_src = r#"
+    #version 330
+
+    in vec3 DIFFUSE;
+    out vec4 color;
+
+    void main() {
+        color = vec4(DIFFUSE, 1.0);
+    }
+"#;
+    let program = glium::Program::from_source(&display, vertex_shader_src, fragment_shader_src, None).unwrap();
+
     events_loop.run(move |ev, _, control_flow| {
 
         let mut target = display.draw();
-        target.clear_color(0.0, 0.0, 1.0, 1.0);
+        target.clear_color(0.0, 0.0, 0.0, 1.0);
+        target.draw(&vertex_buffer, &indices, &program, &glium::uniforms::EmptyUniforms,
+                    &Default::default()).unwrap();
         target.finish().unwrap();
         
+        
         let next_frame_time = std::time::Instant::now() +
             std::time::Duration::from_nanos(16_666_667);
         *control_flow = glutin::event_loop::ControlFlow::WaitUntil(next_frame_time);