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