External shaders

src/flat.frag

@@ -0,0 +1,8 @@
+#version 330
+
+in vec3 DIFFUSE;
+out vec4 color;
+
+void main() {
+  color = vec4(DIFFUSE, 1.0);
+}

src/flat.vert

@@ -0,0 +1,11 @@
+#version 330
+
+in vec2 position;
+in vec3 color;
+
+out vec3 DIFFUSE;
+
+void main() {
+  gl_Position = vec4(position, 0.0, 1.0);
+  DIFFUSE = color;
+}

src/main.rs

@@ -27,29 +27,8 @@ fn main() {
     let vertex_buffer = glium::VertexBuffer::new(&display, &shape).unwrap();
     let indices = glium::index::NoIndices(glium::index::PrimitiveType::TrianglesList);
 
-    let vertex_shader_src = r#"
+    let vertex_shader_src = include_str!("flat.vert");
-    #version 330
+    let fragment_shader_src = include_str!("flat.frag");
-
-    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| {