main.rs

   1 extern crate cgmath;
   2 #[macro_use(uniform,program,implement_vertex)]
   3 extern crate glium;
   4 extern crate glutin;
   5 extern crate image;
   6 extern crate libxm;
   7 extern crate sdl2;
   8
   9 //use cgmath::prelude::*;
  10 use cgmath::{Euler, Matrix4, Rad, Vector3};
  11 use cube::Cube;
  12 use glium::{DisplayBuild, Surface};
  13 use glutin::ElementState::Pressed;
  14 use glutin::Event::KeyboardInput;
  15 use glutin::VirtualKeyCode;
  16
  17 #[cfg(target_os = "emscripten")]
  18 use std::os::raw::{c_int, c_void};
  19
  20 mod bounding_box;
  21 mod cube;
  22 mod mandelwow;
  23 mod sound;
  24 mod support;
  25
  26 fn screenshot(display : &glium::Display) {
  27     let image: glium::texture::RawImage2d<u8> = display.read_front_buffer();
  28     let image = image::ImageBuffer::from_raw(image.width, image.height, image.data.into_owned()).unwrap();
  29     let image = image::DynamicImage::ImageRgba8(image).flipv();
  30     let mut output = std::fs::File::create(&std::path::Path::new("screenshot.png")).unwrap();
  31     image.save(&mut output, image::ImageFormat::PNG).unwrap();
  32 }
  33
  34 fn gl_info(display : &glium::Display) {
  35     let version = *display.get_opengl_version();
  36     let api = match version {
  37         glium::Version(glium::Api::Gl, _, _) => "OpenGL",
  38         glium::Version(glium::Api::GlEs, _, _) => "OpenGL ES"
  39     };
  40     println!("{} context verson: {}", api, display.get_opengl_version_string());
  41 }
  42
  43 #[cfg(target_os = "emscripten")]
  44 #[allow(non_camel_case_types)]
  45 type em_callback_func = unsafe extern fn();
  46 #[cfg(target_os = "emscripten")]
  47 extern {
  48     fn emscripten_set_main_loop(func : em_callback_func, fps : c_int, simulate_infinite_loop : c_int);
  49 }
  50
  51 #[cfg(target_os = "emscripten")]
  52 thread_local!(static MAIN_LOOP_CALLBACK: std::cell::RefCell<*mut c_void> =
  53               std::cell::RefCell::new(std::ptr::null_mut()));
  54
  55 #[cfg(target_os = "emscripten")]
  56 pub fn set_main_loop_callback<F>(callback : F) where F : FnMut() -> support::Action {
  57     MAIN_LOOP_CALLBACK.with(|log| {
  58             *log.borrow_mut() = &callback as *const _ as *mut c_void;
  59             });
  60
  61     unsafe { emscripten_set_main_loop(wrapper::<F>, 0, 1); }
  62
  63     unsafe extern "C" fn wrapper<F>() where F : FnMut() -> support::Action {
  64         MAIN_LOOP_CALLBACK.with(|z| {
  65             let closure = *z.borrow_mut() as *mut F;
  66             (*closure)();
  67         });
  68     }
  69 }
  70
  71 #[cfg(not(target_os = "emscripten"))]
  72 pub fn set_main_loop_callback<F>(callback : F) where F : FnMut() -> support::Action {
  73     support::start_loop(callback);
  74 }
  75
  76 fn main() {
  77     let _soundplayer = sound::start();
  78
  79     let display = glutin::WindowBuilder::new()
  80         .with_dimensions(600, 600)
  81         //.with_fullscreen(glutin::get_primary_monitor())
  82         .with_depth_buffer(24)
  83         .with_vsync()
  84         .with_title(format!("MandelWow"))
  85         .build_glium()
  86         .unwrap();
  87
  88     gl_info(&display);
  89
  90     let mandelwow_program = mandelwow::program(&display);
  91     let bounding_box_program = bounding_box::solid_fill_program(&display);
  92
  93     let mut camera = support::camera::CameraState::new();
  94     let mut t: f32 = 0.0;
  95     let mut pause = false;
  96     let mut bounding_box_enabled = true;
  97     let mut fullscreen = true;
  98
  99     // These are the bounds of the 3D Mandelwow section which we render in 3-space.
 100     let bounds = Cube {
 101         xmin: -2.0,
 102         xmax:  0.7,
 103         ymin: -1.0,
 104         ymax:  1.0,
 105         zmin: -1.1,
 106         zmax:  1.1,
 107     };
 108     let mandelwow_bbox = bounding_box::BoundingBox::new(&display, &bounds, &bounding_box_program);
 109
 110     set_main_loop_callback(|| {
 111         camera.update();
 112
 113         if !pause {
 114             // Increment time
 115             t += 0.01;
 116         }
 117
 118         // Vary the wow factor to slice the Mandelwow along its 4th dimension.
 119         let wmin = -0.8;
 120         let wmax =  0.8;
 121         let wsize = wmax - wmin;
 122         let wow = (((t * 0.7).sin() + 1.0) / 2.0) * wsize + wmin;
 123
 124         //println!("t={} w={:?} camera={:?}", t, w, camera.get_pos());
 125
 126         let mut frame = display.draw();
 127         frame.clear_color_and_depth((0.0, 0.0, 0.0, 1.0), 1.0);
 128
 129         let rotation = cgmath::Matrix4::from(
 130             Euler { x: Rad(t.sin() / 3.), y: Rad(t.sin() / 2.), z: Rad(t / 1.5)});
 131         let z_trans = -2.0;  // Send the model back a little bit so it fits the screen.
 132         let model2 =
 133             Matrix4::from_translation(Vector3::unit_z() * z_trans) * rotation;
 134         let model = cgmath::conv::array4x4(model2);
 135
 136         // Draw the bounding box before the fractal, when the Z-buffer is still clear,
 137         // so the lines behind the semi-translucent areas will be drawn.
 138         if bounding_box_enabled {
 139             let uniforms = uniform! {
 140                 model: model,
 141                 view:  camera.get_view(),
 142                 perspective: camera.get_perspective(),
 143             };
 144             mandelwow_bbox.draw(&mut frame, &uniforms);
 145         }
 146
 147         mandelwow::draw(&display, &mut frame, &mandelwow_program, model, &camera, &bounds, wow);
 148         frame.finish().unwrap();
 149
 150         for ev in display.poll_events() {
 151             match ev {
 152                 glutin::Event::Closed |
 153                 KeyboardInput(Pressed, _, Some(VirtualKeyCode::Escape)) |
 154                 KeyboardInput(Pressed, _, Some(VirtualKeyCode::Q)) => {
 155                     return support::Action::Stop
 156                 },
 157                 KeyboardInput(Pressed, _, Some(VirtualKeyCode::B)) => {
 158                     bounding_box_enabled ^= true;
 159                 },
 160                 KeyboardInput(Pressed, _, Some(VirtualKeyCode::P)) => {
 161                     pause ^= true;
 162                 },
 163                 KeyboardInput(Pressed, _, Some(VirtualKeyCode::PageUp)) => {
 164                     t += 0.01;
 165                 },
 166                 KeyboardInput(Pressed, _, Some(VirtualKeyCode::PageDown)) => {
 167                     t -= 0.01;
 168                 },
 169                 KeyboardInput(Pressed, _, Some(VirtualKeyCode::F10)) => {
 170                     screenshot(&display);
 171                 },
 172                 KeyboardInput(Pressed, _, Some(VirtualKeyCode::F11)) => {
 173                     fullscreen ^= true;
 174                     if fullscreen {
 175                         // Not implemented on Linux
 176                         glutin::WindowBuilder::new()
 177                             .with_fullscreen(glutin::get_primary_monitor())
 178                             .with_depth_buffer(24)
 179                             .rebuild_glium(&display).unwrap();
 180                     } else {
 181                         //glutin::WindowBuilder::new()
 182                         //    .rebuild_glium(&display).unwrap();
 183                     }
 184                 },
 185                 ev => camera.process_input(&ev),
 186             }
 187         }
 188
 189         support::Action::Continue
 190     });
 191 }