wip: walk along torus ridge

src/bin/vrtue.rs

@@ -5,18 +5,26 @@ use vrtue::scene::{Event, Scene};
 extern crate env_logger;
 extern crate gfx_device_gl;
 #[macro_use] extern crate log;
+extern crate piston;
 extern crate piston_window;
 
+use self::piston::input::{Button, Input, Key};
 use self::piston_window::{PistonWindow, Window, WindowSettings};
+use std::env;
+
 
 pub fn main() {
   env_logger::init().expect("env logger");
-  let mut vr = vr::VR::new().expect("VR init");
+  let mut vr = if env::var("NO_VR").is_ok() {
+    None
+  } else {
+    Some(vr::VR::new().expect("VR init"))
+  };
 
   let mut window: PistonWindow =
     WindowSettings::new("Hello, Britannia!", [1024; 2])
         .exit_on_esc(true)
-        .vsync(false)
+        .vsync(vr.is_none())  // Let VR throttle framerate, if available
         .build().expect("Building Window");
 
   let mut aux_command = window.factory.create_command_buffer();
@@ -36,7 +44,8 @@ pub fn main() {
     // handle window events
     while let Some(ev) = window.poll_event() {
       match ev {
-        piston_window::Input::Text(_) => break 'main,
+        Input::Press(Button::Keyboard(Key::Space)) |
+        Input::Press(Button::Keyboard(Key::Escape)) => break'main,
         _ => debug!("\t{:?}", ev)
       }
 
@@ -44,7 +53,7 @@ pub fn main() {
     }
 
     // handle VR events
-    while let Some(ev) = vr.poll_next_event() {
+    while let Some(ev) = vr.as_mut().and_then(|vr| vr.poll_next_event()) {
       scene.event(Event::Vr(ev));
     }
   }

src/scene.rs

@@ -10,7 +10,7 @@ pub trait Scene<D: gfx::Device,
                 F: gfx::Factory<D::Resources>> {
   fn event(&mut self, event: Event);
   fn update(&mut self,
-            vr: &mut vr::VR,
+            vr: &mut Option<vr::VR>,  // TODO: abstract this out
             encoder: &mut gfx::Encoder<D::Resources, D::CommandBuffer>);
   fn render(&self,
             factory: &mut F,

src/scenes/shader/tile_frag.glsl

@@ -10,9 +10,9 @@ uniform b_constants {
   uvec4 anim;
   float R1;
   float R2;
+  float R3;
 };
 uniform b_locals {
-  mat4 camera;
   uint millis;
   float treadmill_x;
   float treadmill_y;

src/scenes/shader/torus_vertex.glsl

@@ -15,9 +15,9 @@ uniform b_constants {
   uvec4 anim;
   float R1;
   float R2;
+  float R3;
 };
 uniform b_locals {
-  mat4 camera;
   uint millis;
   float treadmill_x;
   float treadmill_y;
@@ -35,8 +35,8 @@ void main() {
 
   vec2 thetaphi = vec2(TWO_PI_CIRC * (a_pos.x + treadmill_x),
                        TWO_PI_CIRC * (a_pos.y + treadmill_y));
-  float height = R1 * TWO_PI_CIRC;
-  vec3 normal = vec3(toroid(thetaphi, 0, height, height));
-  gl_Position = u_matrix * camera *
-      vec4(toroid(thetaphi, R1, R2, R1) + a_pos.z * normal, 1.0);
+  float height = R2 * 4 * TWO_PI_CIRC;
+  vec3 normal = vec3(toroid(thetaphi, 0, height, height)) *
+                vec3(R2 / R3, 1.0, 1.0);
+  gl_Position = u_matrix * vec4(toroid(thetaphi, R1, R2, R3) + a_pos.z * normal, 1.0);
 }

src/scenes/world.rs

@@ -9,6 +9,7 @@ extern crate gfx;
 extern crate nalgebra as na;
 extern crate num_traits;
 extern crate openvr_sys;
+extern crate piston;
 extern crate piston_window;
 
 use std::collections::BTreeMap;
@@ -19,13 +20,14 @@ use gfx::tex;
 use gfx::traits::FactoryExt;
 use self::na::ToHomogeneous;
 use self::num_traits::identities::One;
+use self::piston::input::{Button, Input, Key};
 
-//const R1: f32 = 4096.0;
-//const R2: f32 = 1024.0;
-//const R1: f32 = 4.0;
-//const R2: f32 = 1.0;
 const R1: f32 = 256.0;
 const R2: f32 = 64.0;
+const R3: f32 = 128.0;
+const PI: f32 = ::std::f32::consts::PI;
+const TWO_PI: f32 = 2.0 * PI;
+const TWO_PI_CIRC: f32 = TWO_PI / 256.0;
 
 gfx_defines! {
   vertex Vertex {
@@ -38,10 +40,10 @@ gfx_defines! {
     anim: [u32; 4] = "anim",
     r1: f32 = "R1",
     r2: f32 = "R2",
+    r3: f32 = "R3",
   }
 
   constant Locals {
-    camera: [[f32; 4]; 4] = "camera",
     millis: u32 = "millis",
     treadmill_x: f32 = "treadmill_x",
     treadmill_y: f32 = "treadmill_y",
@@ -76,8 +78,7 @@ fn get_model(world: &model::World) -> (Vec<Vertex>, Vec<u32>) {
         10 | 11 | 12 => 1.0,
         _ => 0.0,
       };
-      let rf = (((r + 90) % 256) as i16 - 128) as f32;
-      let cf = (((c + 144) % 256) as i16 - 128) as f32;
+      let (rf, cf) = (r as f32, c as f32);
       if alt == 0.0 {
         verticies.extend_from_slice(
           &[Vertex { pos: [ cf + 0., -rf - 1., 0. ], uv: [0., 0.], tileidx: tileidx },
@@ -133,6 +134,8 @@ pub struct WorldScene<D: gfx::Device,
   start_time: SystemTime,
   treadmills: (f32, f32),
   pads: BTreeMap<u32, (TrackMode, Option<openvr_sys::VRControllerState_t>)>,
+
+  pos: (u8, u8),
 }
 
 impl<D: gfx::Device, F: gfx::Factory<D::Resources>> WorldScene<D, F> {
@@ -147,7 +150,8 @@ impl<D: gfx::Device, F: gfx::Factory<D::Resources>> WorldScene<D, F> {
     let constants = factory.create_constant_buffer(1);
     encoder.update_constant_buffer(&constants, &Constants { anim: ANIMDATA,
                                                             r1: R1,
-                                                            r2: R2 });
+                                                            r2: R2,
+                                                            r3: R3});
 
     WorldScene {
       pso: factory.create_pipeline_simple(VERTEX_SHADER_SRC,
@@ -167,8 +171,19 @@ impl<D: gfx::Device, F: gfx::Factory<D::Resources>> WorldScene<D, F> {
       start_time: SystemTime::now(),
       treadmills: (0.0, 0.0),
       pads: BTreeMap::new(),
+
+      pos: (90, 144),
     }
   }
+
+  fn toroid((x, y): (u8, u8), r1: f32, r2: f32, r3: f32) -> na::Vector3<f32>
+  {
+    let x: f32 = TWO_PI_CIRC * x as f32;
+    let y: f32 = TWO_PI_CIRC * y as f32;
+    na::Vector3::<f32>::new(r3 * -1.0f32 * x.sin(), // use r3 instead of r2 for "deflated" torus
+                            (r1 + r2 * x.cos()) * y.cos(),
+                            (r1 + r2 * x.cos()) * y.sin())
+  }
 }
 
 const ANIMDATA: [u32; 4] =
@@ -196,12 +211,28 @@ impl<D: gfx::Device,
       Vr(Untouch { dev_idx, .. }) => {
         self.pads.remove(&dev_idx);
       },
+      Piston(Input::Press(Button::Keyboard(Key::Left))) => {
+        self.pos = (self.pos.0.wrapping_sub(1), self.pos.1);
+        println!("x: {}, y: {}", self.pos.0, self.pos.1);
+      },
+      Piston(Input::Press(Button::Keyboard(Key::Right))) => {
+        self.pos = (self.pos.0.wrapping_add(1), self.pos.1);
+        println!("x: {}, y: {}", self.pos.0, self.pos.1);
+      },
+      Piston(Input::Press(Button::Keyboard(Key::Up))) => {
+        self.pos = (self.pos.0, self.pos.1.wrapping_sub(1));
+        println!("x: {}, y: {}", self.pos.0, self.pos.1);
+      },
+      Piston(Input::Press(Button::Keyboard(Key::Down))) => {
+        self.pos = (self.pos.0, self.pos.1.wrapping_add(1));
+        println!("x: {}, y: {}", self.pos.0, self.pos.1);
+      },
       _ => ()
     }
   }
 
   fn update(&mut self,
-            vr: &mut vr::VR,
+            vr: &mut Option<vr::VR>,
             encoder: &mut gfx::Encoder<D::Resources, D::CommandBuffer>) {
     const NANOS_PER_MILLI: u32 = 1_000_000;
     const MILLIS_PER_SEC: u64 = 1_000;
@@ -210,7 +241,7 @@ impl<D: gfx::Device,
 
     for (pad, track) in self.pads.iter_mut() {
       let mode = track.0;
-      if let Some(state) = vr.get_controller_state(*pad) {
+      if let Some(state) = vr.as_ref().and_then(|vr| vr.get_controller_state(*pad)) {
         if let Some(old_state) = track.1 {
           match mode {
             TrackMode::Touch => {
@@ -223,7 +254,7 @@ impl<D: gfx::Device,
             },
             TrackMode::Press => {
               let rot = na::Vector3::new(0.0, 0.0, 0.0);
-              let speed = R2 * 0.01;
+              let speed = R2 * 0.005;
               if state.rAxis[0].x > 0.5 {
                 self.camera = na::Similarity3::new(na::Vector3::new(-speed,  0.0, 0.0),
                                                    rot, 1.0).to_homogeneous() * self.camera;
@@ -248,8 +279,7 @@ impl<D: gfx::Device,
       }
     }
 
-    encoder.update_constant_buffer(&self.locals, &Locals { camera: *(self.camera).as_ref(),
-                                                           millis: millis,
+    encoder.update_constant_buffer(&self.locals, &Locals { millis: millis,
                                                            treadmill_x: self.treadmills.0,
                                                            treadmill_y: self.treadmills.1 });
   }
@@ -274,9 +304,14 @@ impl<D: gfx::Device,
   }
 
   fn origin(&self) -> na::Matrix4<f32> {
-    na::Similarity3::new(na::Vector3::new(0.0, R1 - R2, 0.0),
-                         na::Vector3::new(0.0, 0.0, 0.0), 1.0).to_homogeneous()
-
+    let (x, y) = (self.pos.0, self.pos.1);
+    let eye = Self::toroid((x, y), R1, R2, R3);
+    let looktgt = Self::toroid((x, y.wrapping_add(1)), R1, R2, R3);
+    let normal = Self::toroid((x, y), 0.0, R2, R2) * na::Vector3::new(R2 / R3, 1.0, 1.0);
+    self.camera * na::Isometry3::look_at_rh(eye.as_point(),
+                                            looktgt.as_point(),
+                                            &normal,
+                                           ).to_homogeneous()
   }
 }
 

src/view.rs

@@ -9,7 +9,7 @@ extern crate piston_window;
 use gfx;
 use gfx::Device;
 use gfx::traits::FactoryExt;
-use self::na::Inverse;
+use self::na::{Inverse, ToHomogeneous};
 use self::piston_window::{PistonWindow, Window};
 
 pub type ColorFormat = gfx::format::Srgba8;
@@ -29,15 +29,15 @@ pub struct ViewRoot<Dev, T, D>
         T: gfx::format::RenderFormat + gfx::format::TextureFormat,
         D: gfx::format::DepthFormat + gfx::format::TextureFormat {
 
-  left: vr::EyeBuffer<T, D>,
-  right: vr::EyeBuffer<T, D>,
+  left: Option<vr::EyeBuffer<T, D>>,
+  right: Option<vr::EyeBuffer<T, D>>,
   trans: gfx::handle::Buffer<Dev::Resources, Trans>,
 }
 
 impl ViewRoot<gfx_device_gl::Device, ColorFormat, DepthFormat> {
-  pub fn create_view(window: &mut PistonWindow, vr: &VR)
+  pub fn create_view(window: &mut PistonWindow, vr: &Option<VR>)
                      -> ViewRoot<gfx_device_gl::Device, ColorFormat, DepthFormat> {
-
+    if let &Some(ref vr) = vr {
       let render_size = vr.recommended_render_target_size();
 
       let render_size = vr::Size { width: render_size.width * 220 / 100,
@@ -52,16 +52,25 @@ impl ViewRoot<gfx_device_gl::Device, ColorFormat, DepthFormat> {
       window.window.swap_buffers(); // To contain setup calls to Frame 0 in apitrace
 
       ViewRoot::<gfx_device_gl::Device, ColorFormat, DepthFormat> {
-      left: left,
-      right: right,
-      trans: trans.clone(),
+        left: Some(left),
+        right: Some(right),
+        trans: trans,
+      }
+    } else {
+      let trans = window.factory.create_constant_buffer(1);
+      ViewRoot::<gfx_device_gl::Device, ColorFormat, DepthFormat> {
+        left: None,
+        right: None,
+        trans: trans,
+      }
     }
   }
 
   pub fn draw(&self,
               window: &mut PistonWindow,
-              vr: &mut vr::VR,
+              vr: &mut Option<vr::VR>,
               scene: &::scene::Scene<gfx_device_gl::Device, gfx_device_gl::Factory>) {
+    if let &mut Some(ref mut vr) = vr {
       // Get the current sensor state
       let poses = vr.poses();
 
@@ -70,9 +79,10 @@ impl ViewRoot<gfx_device_gl::Device, ColorFormat, DepthFormat> {
 
       for &(eye, buffers) in [(vr::Eye::Left, &self.left),
                               (vr::Eye::Right, &self.right)].into_iter() {
-      window.encoder.clear(&buffers.target, [0.005, 0.005, 0.01, 1.0]);
-
-      window.encoder.clear_depth(&buffers.depth, 1.0);
+        let target = &buffers.as_ref().expect("vr color buffer").target;
+        let depth = &buffers.as_ref().expect("vr depth buffer").depth;
+        window.encoder.clear(target, [0.005, 0.005, 0.01, 1.0]);
+        window.encoder.clear_depth(depth, 1.0);
 
         let proj_mat = vr.projection_matrix(eye, NEAR, FAR);
         let eye_mat = vr.head_to_eye_transform(eye);
@@ -83,8 +93,18 @@ impl ViewRoot<gfx_device_gl::Device, ColorFormat, DepthFormat> {
         scene.render(&mut window.factory,
                      &mut window.encoder,
                      &self.trans,
-                   &buffers.target,
-                   &buffers.depth);
+                     &target,
+                     &depth);
+      }
+    } else {
+      // If running without VR, just draw from some default projection near the scene origin
+      let head_mat = na::Similarity3::new(na::Vector3::new(0.0, -1.5, 0.0),
+                                          na::Vector3::new(0.0, 0.0, 0.0),
+                                          1.0).to_homogeneous();
+      let proj_mat = na::PerspectiveMatrix3::new(1.0, 90.0, NEAR, FAR).to_matrix();
+      let scene_mat = scene.origin();
+      let trans = Trans { matrix: *(proj_mat * head_mat * scene_mat).as_ref() };
+      window.encoder.update_constant_buffer(&self.trans, &trans);
     }
     // draw monitor window
     window.encoder.clear(&window.output_color, [0.005, 0.005, 0.01, 1.0]);
@@ -96,8 +116,12 @@ impl ViewRoot<gfx_device_gl::Device, ColorFormat, DepthFormat> {
                  &window.output_stencil);
 
     window.encoder.flush(&mut window.device);
-    vr.submit(vr::Eye::Left, &self.left.tex);
-    vr.submit(vr::Eye::Right, &self.right.tex);
+    if let (&mut Some(ref mut vr),
+            &Some(ref left),
+            &Some(ref right)) = (vr, &self.left, &self.right) {
+      vr.submit(vr::Eye::Left, &left.tex);
+      vr.submit(vr::Eye::Right, &right.tex);
+    }
     window.window.swap_buffers();
     window.device.cleanup();
   }