From 695f4cec3b8216577b9ce7e0b017e23b2eb19212 Mon Sep 17 00:00:00 2001
From: Kjetil Orbekk <kjetil.orbekk@gmail.com>
Date: Fri, 10 Jun 2016 23:45:06 -0400
Subject: OpenGL example using glium.

---
 rust/opengl/Cargo.toml  |  8 +++++++
 rust/opengl/default.nix | 10 ++++++++
 rust/opengl/src/main.rs | 64 +++++++++++++++++++++++++++++++++++++++++++++++++
 3 files changed, 82 insertions(+)
 create mode 100644 rust/opengl/Cargo.toml
 create mode 100644 rust/opengl/default.nix
 create mode 100644 rust/opengl/src/main.rs

(limited to 'rust')

diff --git a/rust/opengl/Cargo.toml b/rust/opengl/Cargo.toml
new file mode 100644
index 0000000..6407830
--- /dev/null
+++ b/rust/opengl/Cargo.toml
@@ -0,0 +1,8 @@
+[package]
+name = "opengl"
+version = "0.1.0"
+authors = ["Kjetil Orbekk <kjetil.orbekk@gmail.com>"]
+
+[dependencies]
+glium = "0.14.0"
+
diff --git a/rust/opengl/default.nix b/rust/opengl/default.nix
new file mode 100644
index 0000000..522e4d0
--- /dev/null
+++ b/rust/opengl/default.nix
@@ -0,0 +1,10 @@
+with import <nixpkgs> {};
+with xorg;
+{
+  allowUnfree = true;
+  games = stdenv.mkDerivation rec {
+    name = "opengl";
+    buildInputs = [ libXi libX11 xorg.libXext xorg.libXcursor xorg.libXrandr xorg.libXxf86vm  mesa openal ];
+    LD_LIBRARY_PATH = lib.makeLibraryPath buildInputs;
+  };
+}
diff --git a/rust/opengl/src/main.rs b/rust/opengl/src/main.rs
new file mode 100644
index 0000000..667339b
--- /dev/null
+++ b/rust/opengl/src/main.rs
@@ -0,0 +1,64 @@
+#[macro_use]
+extern crate glium;
+
+fn main() {
+    use glium::DisplayBuild;
+    use glium::Surface;
+
+    let display = glium::glutin::WindowBuilder::new()
+        .with_dimensions(1024, 768)
+        .with_title(format!("Hello world"))
+        .build_glium()
+        .unwrap();
+
+    // let display = glium::glutin::WindowBuilder::new().build_glium().unwrap();
+
+    #[derive(Copy, Clone)]
+    struct Vertex {
+        position: [f32; 2],
+    }
+
+    implement_vertex!(Vertex, position);
+
+    let vertex1 = Vertex { position: [-0.5, -0.5] };
+    let vertex2 = Vertex { position: [ 0.0,  0.5] };
+    let vertex3 = Vertex { position: [ 0.5, -0.25] };
+    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 140
+        in vec2 position;
+        void main() {
+            gl_Position = vec4(position, 0.0, 1.0);
+        }
+    "#;
+
+    let fragment_shader_src = r#"
+        #version 140
+        out vec4 color;
+        void main() {
+            color = vec4(1.0, 0.0, 0.0, 1.0);
+        }
+    "#;
+
+    let program = glium::Program::from_source(&display, vertex_shader_src, fragment_shader_src, None).unwrap();
+
+    loop {
+        let mut target = display.draw();
+        target.clear_color(0.0, 0.0, 1.0, 1.0);
+        target.draw(&vertex_buffer, &indices, &program, &glium::uniforms::EmptyUniforms,
+                    &Default::default()).unwrap();
+        target.finish().unwrap();
+
+        for ev in display.poll_events() {
+            match ev {
+                glium::glutin::Event::Closed => return,
+                _ => ()
+            }
+        }
+    }
+
+}
-- 
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