First Commit

src/main.rs

@@ -0,0 +1,127 @@
+#[macro_use]
+extern crate glium;
+use glium::Surface;
+mod teapot;
+
+fn main() {
+    let event_loop = glium::winit::event_loop::EventLoop::builder()
+        .build()
+        .expect("event loop building");
+    let (window, display) = glium::backend::glutin::SimpleWindowBuilder::new()
+        .with_title("Glium tutorial #3")
+        .build(&event_loop);
+
+
+    let positions = glium::VertexBuffer::new(&display, &teapot::VERTICES).unwrap();
+    let normals = glium::VertexBuffer::new(&display, &teapot::NORMALS).unwrap();
+    let indices = glium::IndexBuffer::new(&display, glium::index::PrimitiveType::TrianglesList,
+                                        &teapot::INDICES).unwrap();
+
+    let vertex_shader_src = r#"
+        #version 140
+
+        in vec3 position;
+        in vec3 normal;
+
+        out vec3 v_normal;
+
+        uniform mat4 matrix;
+        uniform mat4 perspective;
+
+        void main() {
+            v_normal = transpose(inverse(mat3(matrix))) * normal;
+            gl_Position = perspective * matrix * vec4(position, 1.0);
+        }
+    "#;
+    let fragment_shader_src = r#"
+        #version 140
+
+        in vec3 v_normal;
+        out vec4 color;
+        uniform vec3 u_light;
+
+        void main() {
+            float brightness = dot(normalize(v_normal), normalize(u_light));
+            vec3 dark_color = vec3(0.6, 0.0, 0.0);
+            vec3 regular_color = vec3(1.0, 0.0, 0.0);
+            color = vec4(mix(dark_color, regular_color, brightness), 1.0);
+        }
+    "#;
+    let program = glium::Program::from_source(&display, vertex_shader_src, fragment_shader_src, None).unwrap();
+
+    let light = [-1.0, 0.4, 0.9f32];
+    let mut t: f32 = 0.0;
+    #[allow(deprecated)]
+    event_loop.run(move |ev, window_target| {
+        match ev {
+            glium::winit::event::Event::WindowEvent { event, .. } => match event {
+                glium::winit::event::WindowEvent::CloseRequested => {
+                    window_target.exit();
+                },
+                // We now need to render everyting in response to a RedrawRequested event due to the animation
+                glium::winit::event::WindowEvent::RedrawRequested => {
+                    let mut target = display.draw();
+                    target.clear_color_and_depth((0.0, 0.0, 0.0, 1.0), 1.0);
+                    t += 0.01;
+                    let x = t.sin() * 0.5;
+                    let y = t.cos() * 0.5;
+
+                    let perspective = {
+                        let (width, height) = target.get_dimensions();
+                        let aspect_ratio = height as f32 / width as f32;
+
+                        let fov: f32 = 3.141592 / 3.0;
+                        let zfar = 1024.0;
+                        let znear = 0.1;
+
+                        let f = 1.0 / (fov / 2.0).tan();
+
+                        [
+                            [f *   aspect_ratio   ,    0.0,              0.0              ,   0.0],
+                            [         0.0         ,     f ,              0.0              ,   0.0],
+                            [         0.0         ,    0.0,  (zfar+znear)/(zfar-znear)    ,   1.0],
+                            [         0.0         ,    0.0, -(2.0*zfar*znear)/(zfar-znear),   0.0],
+                        ]
+                    };
+
+                    let uniforms = uniform! {
+                        matrix: [
+                            [0.01, 0.0, 0.0, 0.0],
+                            [0.0, 0.01, 0.0, 0.0],
+                            [0.0, 0.0, 0.01, 0.0],
+                            [x, y, 2.0, 1.0f32 ],
+                        ],
+                        u_light: light,
+                        perspective: perspective
+                    };
+
+                    let params = glium::DrawParameters {
+                        depth: glium::Depth {
+                            test: glium::draw_parameters::DepthTest::IfLess,
+                            write: true,
+                            .. Default::default()
+                        },
+                        .. Default::default()
+                    };
+
+                    target.draw((&positions, &normals), &indices, &program, &uniforms,
+                                &params).unwrap();
+                    target.finish().unwrap();
+                },
+                // Because glium doesn't know about windows we need to resize the display
+                // when the window's size has changed.
+                glium::winit::event::WindowEvent::Resized(window_size) => {
+                    display.resize(window_size.into());
+                },
+                _ => (),
+            },
+            // By requesting a redraw in response to a RedrawEventsCleared event we get continuous rendering.
+            // For applications that only change due to user input you could remove this handler.
+            glium::winit::event::Event::AboutToWait => {
+                window.request_redraw();
+            },
+            _ => (),
+        }
+    })
+    .unwrap();
+}