Starting to work

src/math/vector.rs

@@ -66,6 +66,11 @@ macro_rules! make_vector {
                 pub fn $x(&self) -> T {
                     self.data[$y]
                 }
+
+                /// Get a mut ref to the coordinate of the vector.
+                pub fn $x_mut(&mut self) -> &mut T {
+                    &mut self.data[$y]
+                }
              )*
         }
 

src/programs/viewer.rs

@@ -12,14 +12,17 @@ use glium::glutin::Event;
 use glium::glutin::WindowEvent;
 use glium::glutin::VirtualKeyCode;
 
+
+use model_converter::math::vector::Vector3;
 use model_converter::parser::{parse, parse_into_model};
 use model_converter::renderer::Renderer;
-use model_converter::renderer::camera::RotatingCamera;
+use model_converter::renderer::controls::OrbitControls;
+use model_converter::renderer::camera::Camera;
 
 fn main() {
 
-    let mut model = parse("./assets/models/toonlink/link.mtl").unwrap();
-    parse_into_model("./assets/models/toonlink/link.obj", &mut model).unwrap();
+    let mut model = parse("./assets/models/cube/cube.mtl").unwrap();
+    parse_into_model("./assets/models/cube/cube.obj", &mut model).unwrap();
 
     let mut events_loop = EventsLoop::new();
     let window = WindowBuilder::new();
@@ -31,18 +34,21 @@ fn main() {
     let mut renderer = Renderer::new(display);
     renderer.add_model(&model);
 
-    let mut camera = RotatingCamera::new(50.0);
+    let mut camera = Camera::new(
+        Vector3::new( 0.0, 0.0, 0.0),
+        Vector3::new( 0.0, 0.0, 0.0),
+        Vector3::new( 0.0, 1.0, 0.0),
+    );
+
+    let mut controls = OrbitControls::new(&mut camera);
 
     while !closed {
 
-        camera.increase_theta(0.025);
-
-        let mut target = renderer.draw();
-        renderer.render(&camera, &mut target);
-
-        target.finish().unwrap();
-
         events_loop.poll_events(|ev| {
+
+            use model_converter::renderer::controls::Controls;
+            controls.manage_event(&ev, &mut camera);
+
             match ev {
                 // Close window
                 Event::WindowEvent {
@@ -61,5 +67,11 @@ fn main() {
                 _ => (),
             }
         });
+
+
+        let mut target = renderer.draw();
+        renderer.render(&camera, &mut target);
+        target.finish().unwrap();
+
     }
 }

src/renderer/camera.rs

@@ -1,6 +1,6 @@
 use math::vector::Vector3;
 
-pub trait Camera {
+pub trait RenderCamera {
     fn get_view_matrix(&self) -> [[f32; 4]; 4];
     fn get_perspective_matrix(&self, dimensions: (u32, u32)) -> [[f32; 4]; 4] {
         let (width, height) = dimensions;
@@ -61,15 +61,15 @@ pub fn look_at_matrix(position: [f32; 3], target: [f32; 3], up: [f32; 3]) -> [[f
 
 }
 
-pub struct FixedCamera {
-    position: Vector3<f32>,
-    target: Vector3<f32>,
-    up: Vector3<f32>,
+pub struct Camera {
+    pub position: Vector3<f32>,
+    pub target: Vector3<f32>,
+    pub up: Vector3<f32>,
 }
 
-impl FixedCamera {
-    pub fn new(position: Vector3<f32>, target: Vector3<f32>, up: Vector3<f32>) -> FixedCamera {
-        FixedCamera {
+impl Camera {
+    pub fn new(position: Vector3<f32>, target: Vector3<f32>, up: Vector3<f32>) -> Camera {
+        Camera {
             position: position,
             target: target,
             up: up,
@@ -77,7 +77,7 @@ impl FixedCamera {
     }
 }
 
-impl Camera for FixedCamera {
+impl RenderCamera for Camera {
     fn get_view_matrix(&self) -> [[f32; 4]; 4] {
         look_at_matrix(self.position.into(), self.target.into(), self.up.into())
     }
@@ -101,7 +101,7 @@ impl RotatingCamera {
     }
 }
 
-impl Camera for RotatingCamera {
+impl RenderCamera for RotatingCamera {
     fn get_view_matrix(&self) -> [[f32; 4]; 4] {
         let position = Vector3::new(
             self.distance * self.theta.cos(),

src/renderer/controls.rs

@@ -0,0 +1,119 @@
+const EPSILON: f32 = 0.001;
+
+use glium::glutin::{
+    Event,
+    WindowEvent,
+    ElementState,
+    MouseButton,
+    MouseScrollDelta,
+};
+
+use math::vector::Vector2;
+use renderer::camera::Camera;
+
+/// The trait that all controls should implement.
+pub trait Controls {
+
+    /// Modifies the camera depending on the event.
+    fn manage_event(&mut self, event: &Event, camera: &mut Camera);
+}
+
+/// An orbit controls allowing to orbit around an object.
+///
+/// Only object centered are supported.
+pub struct OrbitControls {
+    /// The last position of the mouse.
+    mouse_position: Vector2<f32>,
+
+    /// Wether the left click of the mouse is pressed or not.
+    pressed: bool,
+
+    /// The theta angle of the position of the camera in spheric coordinates.
+    theta: f32,
+
+    /// The phi angle of the position of the camera in spheric coordinates.
+    phi: f32,
+
+    /// The distance between the camera and the origin.
+    distance: f32,
+
+    /// The sensitiviy of the rotation of the mouse.
+    sensitivity: f32,
+}
+
+impl OrbitControls {
+
+    /// Creates a new orbit controls, and initializes the camera.
+    pub fn new(camera: &mut Camera) -> OrbitControls {
+        let controls = OrbitControls {
+            mouse_position: Vector2::new(0.0, 0.0),
+            pressed: false,
+            theta: 0.0,
+            phi: 0.0,
+            distance: 5.0,
+            sensitivity: 200.0,
+        };
+
+        *camera.position.x_mut() = controls.distance * controls.theta.cos();
+        *camera.position.y_mut() = 0.0;
+        *camera.position.z_mut() = controls.distance * controls.phi.sin();
+        controls
+    }
+}
+
+impl Controls for OrbitControls {
+    fn manage_event(&mut self, event: &Event, camera: &mut Camera) {
+        match *event {
+
+            Event::WindowEvent {
+                event: WindowEvent::MouseInput {
+                    button: MouseButton::Left,
+                    state, ..
+                }, ..
+            } => {
+                self.pressed = state == ElementState::Pressed;
+            },
+
+            Event::WindowEvent {
+                event: WindowEvent::MouseWheel {
+                    delta: MouseScrollDelta::LineDelta(_, y), ..
+                }, ..
+            } => {
+                self.distance -= y;
+
+                *camera.position.x_mut() = self.distance * self.phi.cos() * self.theta.cos();
+                *camera.position.y_mut() = self.distance * self.phi.sin();
+                *camera.position.z_mut() = self.distance * self.phi.cos() * self.theta.sin();
+            },
+
+            Event::WindowEvent{
+                event: WindowEvent::CursorMoved {
+                    position: (x, y), ..
+                }, ..
+            } => {
+                let current_position = Vector2::new(x as f32, y as f32);
+
+                if self.pressed {
+                    let difference = (current_position - self.mouse_position) / self.sensitivity;
+
+                    self.theta += difference.x();
+                    self.phi   += difference.y();
+
+                    use std::f32::consts::PI;
+                    self.phi = self.phi.max(- PI/2.0 + EPSILON);
+                    self.phi = self.phi.min(  PI/2.0 - EPSILON);
+
+                    *camera.position.x_mut() = self.distance * self.phi.cos() * self.theta.cos();
+                    *camera.position.y_mut() = self.distance * self.phi.sin();
+                    *camera.position.z_mut() = self.distance * self.phi.cos() * self.theta.sin();
+
+                }
+
+                // Record new position
+                self.mouse_position = current_position;
+            },
+
+            _ => (),
+        }
+    }
+}

src/renderer/mod.rs

@@ -1,4 +1,5 @@
 pub mod camera;
+pub mod controls;
 
 use glium::draw_parameters::DepthTest;
 use glium::texture::{
@@ -20,7 +21,7 @@ use glium::{
 use image;
 
 use model::{Model, Vertex};
-use renderer::camera::Camera;
+use renderer::camera::RenderCamera;
 
 pub struct RenderMaterial {
     texture: Option<SrgbTexture2d>,
@@ -105,7 +106,7 @@ impl<'a> Renderer<'a> {
         self.display.draw()
     }
 
-    pub fn render<C: Camera>(&self, camera: &C, target: &mut Frame) {
+    pub fn render<C: RenderCamera>(&self, camera: &C, target: &mut Frame) {
         use glium::Surface;
         target.clear_color_and_depth((0.0, 0.0, 0.0, 1.0), 1.0);
 
@@ -119,6 +120,7 @@ impl<'a> Renderer<'a> {
         };
 
         for &(_, ref buffers) in &self.models {
+
             for &(ref material, ref buffer) in buffers {
 
                 let perspective = camera.get_perspective_matrix(target.get_dimensions());