From 11a16e092f6676529a1c4310efd2926115697503 Mon Sep 17 00:00:00 2001
From: Jared Roberts <jaredr@gmail.com>
Date: Fri, 21 Oct 2016 18:59:34 -0700
Subject: [PATCH] hotkeys for torus radius, camera reset

---
 src/bin/vrtue.rs    |  1 -
 src/scenes/world.rs | 67 ++++++++++++++++++++++++++++++++++-----------
 src/view.rs         |  2 +-
 3 files changed, 52 insertions(+), 18 deletions(-)

diff --git a/src/bin/vrtue.rs b/src/bin/vrtue.rs
index 64e3a4a..ffc7496 100644
--- a/src/bin/vrtue.rs
+++ b/src/bin/vrtue.rs
@@ -29,7 +29,6 @@ pub fn main() {
   let mut aux_command = window.factory.create_command_buffer();
   let mut scene = scenes::world::WorldScene::new(&mut window.device,
                                                  &mut window.factory,
-                                                 &mut window.encoder,
                                                  &mut aux_command);
   let view = view::ViewRoot::<gfx_device_gl::Device, view::ColorFormat, view::DepthFormat>
                            ::create_view(&mut window, &mut vr);
diff --git a/src/scenes/world.rs b/src/scenes/world.rs
index 8d96068..a8b1df7 100644
--- a/src/scenes/world.rs
+++ b/src/scenes/world.rs
@@ -6,11 +6,11 @@ use world as model;
 use world::HasMap;
 
 extern crate gfx;
+extern crate memmap;
 extern crate nalgebra as na;
 extern crate num_traits;
 extern crate openvr_sys;
 extern crate piston;
-extern crate piston_window;
 
 use std::collections::BTreeMap;
 use std::marker::PhantomData;
@@ -121,7 +121,9 @@ pub struct WorldScene<D: gfx::Device,
                       F: gfx::Factory<D::Resources>> {
   pso: gfx::PipelineState<D::Resources, pipe::Meta>,
   camera: na::Matrix4<f32>,
-  constants: gfx::handle::Buffer<D::Resources, Constants>,
+  constants: Constants,
+  constants_buffer: gfx::handle::Buffer<D::Resources, Constants>,
+  constants_dirty: bool,
   locals: gfx::handle::Buffer<D::Resources, Locals>,
   atlas: gfx::handle::ShaderResourceView<D::Resources,
                                          <view::ColorFormat as gfx::format::Formatted>::View>,
@@ -143,26 +145,21 @@ pub struct WorldScene<D: gfx::Device,
 impl<D: gfx::Device, F: gfx::Factory<D::Resources>> WorldScene<D, F> {
   pub fn new(device: &mut D,
              factory: &mut F,
-             encoder: &mut gfx::Encoder<D::Resources, D::CommandBuffer>,
              aux_command: &mut <D as gfx::Device>::CommandBuffer) -> WorldScene<D, F> {
     let worldmap = get_data_model();
     let (model, model_idx) = get_model(&worldmap);
     let (vertex_buffer, slice) =
         factory.create_vertex_buffer_with_slice(&model, &model_idx[..]);
 
-    let constants = factory.create_constant_buffer(1);
-    encoder.update_constant_buffer(&constants, &Constants { anim: ANIMDATA,
-                                                            r1: R1,
-                                                            r2: R2,
-                                                            r3: R3});
-
     WorldScene {
       pso: factory.create_pipeline_simple(VERTEX_SHADER_SRC,
                                           FRAGMENT_SHADER_SRC,
                                           pipe::new())
                   .expect("create pipeline"),
       camera: na::Matrix4::one(),
-      constants: constants,
+      constants: Constants { anim: ANIMDATA, r1: R1, r2: R2, r3: R3},
+      constants_buffer: factory.create_constant_buffer(1),
+      constants_dirty: true,
       locals: factory.create_constant_buffer(1),
       atlas: tile::get_tiles::<_, _, view::ColorFormat>(device, factory, aux_command),
       sampler: factory.create_sampler(tex::SamplerInfo::new(tex::FilterMethod::Jrd,
@@ -204,6 +201,7 @@ impl<D: gfx::Device,
     use scene::Event::*;
     use vr::Event::*;
     match event {
+      // treadmill / camera movement registration
       Vr(Touch { dev_idx, .. }) => {
         self.pads.insert(dev_idx, (TrackMode::Touch, None));
       },
@@ -216,6 +214,16 @@ impl<D: gfx::Device,
       Vr(Untouch { dev_idx, .. }) => {
         self.pads.remove(&dev_idx);
       },
+
+      // treadmill / camera reset
+      Piston(Input::Press(Button::Keyboard(Key::Backspace))) => {
+        self.treadmills = (0.0, 0.0);
+      },
+      Piston(Input::Press(Button::Keyboard(Key::D0))) => {
+        self.camera = na::Matrix4::one();
+      },
+
+      // player movement
       Piston(Input::Press(Button::Keyboard(Key::Up))) => {
         self.lat = self.lat.wrapping_sub(1);
       },
@@ -228,6 +236,28 @@ impl<D: gfx::Device,
       Piston(Input::Press(Button::Keyboard(Key::Right))) => {
         self.lng = self.lng.wrapping_add(1);
       },
+
+      // scale adjustment
+      Piston(Input::Press(Button::Keyboard(Key::Q))) => {
+        self.constants = Constants { r1: R1 / 2.0, r2: R2 / 2.0, r3: R3 / 2.0, ..self.constants };
+        self.constants_dirty = true;
+      },
+      Piston(Input::Press(Button::Keyboard(Key::D1))) => {
+        self.constants = Constants { r1: R1, r2: R2, r3: R3, ..self.constants };
+        self.constants_dirty = true;
+      },
+      Piston(Input::Press(Button::Keyboard(Key::D2))) => {
+        self.constants = Constants { r1: R1 * 2.0, r2: R2 * 2.0, r3: R3 * 2.0, ..self.constants };
+        self.constants_dirty = true;
+      },
+      Piston(Input::Press(Button::Keyboard(Key::D3))) => {
+        self.constants = Constants { r1: R1 * 4.0, r2: R2 * 4.0, r3: R3 * 4.0, ..self.constants };
+        self.constants_dirty = true;
+      },
+      Piston(Input::Press(Button::Keyboard(Key::D4))) => {
+        self.constants = Constants { r1: R1 * 16.0, r2: R2 * 16.0, r3: R3 * 16.0, ..self.constants };
+        self.constants_dirty = true;
+      },
       _ => ()
     }
   }
@@ -280,6 +310,11 @@ impl<D: gfx::Device,
       }
     }
 
+    if self.constants_dirty {
+      self.constants_dirty = false;
+      encoder.update_constant_buffer(&self.constants_buffer, &self.constants);
+    }
+
     encoder.update_constant_buffer(&self.locals, &Locals { millis: millis,
                                                            treadmill_x: self.treadmills.0,
                                                            treadmill_y: self.treadmills.1 });
@@ -295,7 +330,7 @@ impl<D: gfx::Device,
     let pipe = pipe::Data {
       vbuf: self.vbuf.clone(),
       trans: trans.clone(),
-      constants: self.constants.clone(),
+      constants: self.constants_buffer.clone(),
       locals: self.locals.clone(),
       atlas: (self.atlas.clone(), self.sampler.clone()),
       pixcolor: target.clone(),
@@ -305,10 +340,11 @@ impl<D: gfx::Device,
   }
 
   fn origin(&self) -> na::Matrix4<f32> {
-    let (y, x) = (self.lat as f32 + 0.5, self.lng as f32 + 0.5);
-    let eye = Self::toroid((x, y), R1, R2, R3);
-    let looktgt = Self::toroid((x, y - 1.0), R1, R2, R3);
-    let normal = Self::toroid((x, y), 0.0, R2, R2) * na::Vector3::new(R2 / R3, 1.0, 1.0);
+    let (r1, r2, r3) = (self.constants.r1, self.constants.r2, self.constants.r3);
+    let (y, x) = (self.lat as f32 + 0.5, self.lng as f32 + 0.5);  // center of tile
+    let eye = Self::toroid((x, y), r1, r2, r3);
+    let looktgt = Self::toroid((x, y - 1.0), r1, r2, r3);  // look ahead = north
+    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,
@@ -316,7 +352,6 @@ impl<D: gfx::Device,
   }
 }
 
-extern crate memmap;
 fn get_data_model() -> model::World {
   use self::memmap::{Mmap, Protection};
   use std::mem::transmute;
diff --git a/src/view.rs b/src/view.rs
index a16bda4..5b91b9c 100644
--- a/src/view.rs
+++ b/src/view.rs
@@ -16,7 +16,7 @@ pub type ColorFormat = gfx::format::Srgba8;
 pub type DepthFormat = gfx::format::DepthStencil;
 
 const NEAR: f32 = 0.01;
-const FAR: f32 = 1000.0;
+const FAR: f32 = 3072.0;
 
 gfx_constant_struct! {
   Trans {