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 #[cfg(not(target_os = "emscripten"))]
   7 extern crate libxm;
   8 #[cfg(not(target_os = "emscripten"))]
   9 extern crate sdl2;
  10
  11 //use cgmath::prelude::*;
  12 use cgmath::{Euler, Matrix4, Rad, Vector3};
  13 use cube::Cube;
  14 use glium::{DisplayBuild, Surface};
  15 use glutin::ElementState::Pressed;
  16 use glutin::Event::KeyboardInput;
  17 use glutin::VirtualKeyCode;
  18 use std::os::raw::{c_int, c_void};
  19
  20 mod bounding_box;
  21 mod cube;
  22 mod mandelwow;
  23 #[cfg(not(target_os = "emscripten"))]
  24 mod sound;
  25 #[cfg(target_os = "emscripten")]
  26 #[path = "sound_emscripten.rs"]
  27 mod sound;
  28 mod support;
  29
  30 fn screenshot(display : &glium::Display) {
  31     let image: glium::texture::RawImage2d<u8> = display.read_front_buffer();
  32     let image = image::ImageBuffer::from_raw(image.width, image.height, image.data.into_owned()).unwrap();
  33     let image = image::DynamicImage::ImageRgba8(image).flipv();
  34     let mut output = std::fs::File::create(&std::path::Path::new("screenshot.png")).unwrap();
  35     image.save(&mut output, image::ImageFormat::PNG).unwrap();
  36 }
  37
  38 #[allow(non_camel_case_types)]
  39 type em_callback_func = unsafe extern fn();
  40 extern {
  41     fn emscripten_set_main_loop(func : em_callback_func, fps : c_int, simulate_infinite_loop : c_int);
  42 }
  43
  44 thread_local!(static MAIN_LOOP_CALLBACK: std::cell::RefCell<*mut c_void> =
  45               std::cell::RefCell::new(std::ptr::null_mut()));
  46
  47 pub fn set_main_loop_callback<F>(callback : F) where F : FnMut() {
  48     MAIN_LOOP_CALLBACK.with(|log| {
  49             *log.borrow_mut() = &callback as *const _ as *mut c_void;
  50             });
  51
  52     unsafe { emscripten_set_main_loop(wrapper::<F>, 0, 1); }
  53
  54     unsafe extern "C" fn wrapper<F>() where F : FnMut() {
  55         MAIN_LOOP_CALLBACK.with(|z| {
  56             let closure = *z.borrow_mut() as *mut F;
  57             (*closure)();
  58         });
  59     }
  60 }
  61
  62 fn main() {
  63     let _soundplayer = sound::start();
  64
  65     let display = glutin::WindowBuilder::new()
  66         .with_dimensions(300, 300)
  67         //.with_fullscreen(glutin::get_primary_monitor())
  68         .with_depth_buffer(24)
  69         .with_vsync()
  70         .with_title(format!("MandelWow"))
  71         .build_glium()
  72         .unwrap();
  73
  74     let version = *display.get_opengl_version();
  75     let api = match version {
  76         glium::Version(glium::Api::Gl, _, _) => "OpenGL",
  77         glium::Version(glium::Api::GlEs, _, _) => "OpenGL ES"
  78     };
  79     println!("{} context verson: {}", api, display.get_opengl_version_string());
  80
  81     let mandelwow_program = mandelwow::program(&display);
  82     let bounding_box_program = bounding_box::solid_fill_program(&display);
  83
  84     let mut camera = support::camera::CameraState::new();
  85     let mut t: f32 = 0.0;
  86     let mut pause = false;
  87     let mut bounding_box_enabled = true;
  88     let mut fullscreen = true;
  89
  90     // These are the bounds of the 3D Mandelwow section which we render in 3-space.
  91     let bounds = Cube {
  92         xmin: -2.0,
  93         xmax:  0.7,
  94         ymin: -1.0,
  95         ymax:  1.0,
  96         zmin: -1.1,
  97         zmax:  1.1,
  98     };
  99
 100     //support::start_loop(|| {
 101     set_main_loop_callback(|| {
 102         camera.update();
 103
 104         if !pause {
 105             // Increment time
 106             t += 0.01;
 107         }
 108
 109         // Vary the wow factor to slice the Mandelwow along its 4th dimension.
 110         let wmin = -0.8;
 111         let wmax =  0.8;
 112         let wsize = wmax - wmin;
 113         let wow = (((t * 0.7).sin() + 1.0) / 2.0) * wsize + wmin;
 114
 115         //println!("t={} w={:?} camera={:?}", t, w, camera.get_pos());
 116
 117         let mut frame = display.draw();
 118         frame.clear_color_and_depth((0.0, 0.0, 0.0, 1.0), 1.0);
 119
 120         let rotation = cgmath::Matrix4::from(
 121             Euler { x: Rad(t.sin() / 3.), y: Rad(t.sin() / 2.), z: Rad(t)});
 122         let z_trans = -2.0;  // Send the model back a little bit so it fits the screen.
 123         let model2 =
 124             Matrix4::from_translation(Vector3::unit_z() * z_trans) * rotation;
 125         let model = cgmath::conv::array4x4(model2);
 126
 127         // Draw the bounding box before the fractal, when the Z-buffer is still clear,
 128         // so the lines behind the semi-translucent areas will be drawn.
 129         if bounding_box_enabled {
 130             let uniforms = uniform! {
 131                 model: model,
 132                 view:  camera.get_view(),
 133                 perspective: camera.get_perspective(),
 134             };
 135             bounding_box::draw(&display, &mut frame, &bounding_box_program, &uniforms, &bounds);
 136         }
 137
 138         mandelwow::draw(&display, &mut frame, &mandelwow_program, model, &camera, &bounds, wow);
 139         frame.finish().unwrap();
 140
 141         for ev in display.poll_events() {
 142             match ev {
 143                 glutin::Event::Closed |
 144                 KeyboardInput(Pressed, _, Some(VirtualKeyCode::Escape)) |
 145                 KeyboardInput(Pressed, _, Some(VirtualKeyCode::Q)) => {
 146                     //return support::Action::Stop
 147                 },
 148                 KeyboardInput(Pressed, _, Some(VirtualKeyCode::B)) => {
 149                     bounding_box_enabled ^= true;
 150                 },
 151                 KeyboardInput(Pressed, _, Some(VirtualKeyCode::P)) => {
 152                     pause ^= true;
 153                 },
 154                 KeyboardInput(Pressed, _, Some(VirtualKeyCode::PageUp)) => {
 155                     t += 0.01;
 156                 },
 157                 KeyboardInput(Pressed, _, Some(VirtualKeyCode::PageDown)) => {
 158                     t -= 0.01;
 159                 },
 160                 KeyboardInput(Pressed, _, Some(VirtualKeyCode::F10)) => {
 161                     screenshot(&display);
 162                 },
 163                 KeyboardInput(Pressed, _, Some(VirtualKeyCode::F11)) => {
 164                     fullscreen ^= true;
 165                     if fullscreen {
 166                         // Not implemented on Linux
 167                         glutin::WindowBuilder::new()
 168                             .with_fullscreen(glutin::get_primary_monitor())
 169                             .with_depth_buffer(24)
 170                             .rebuild_glium(&display).unwrap();
 171                     } else {
 172                         //glutin::WindowBuilder::new()
 173                         //    .rebuild_glium(&display).unwrap();
 174                     }
 175                 },
 176                 ev => camera.process_input(&ev),
 177             }
 178         }
 179
 180         //support::Action::Continue
 181     });
 182 }