webrender/examples/multiwindow.rs

/* This Source Code Form is subject to the terms of the Mozilla Public
 * License, v. 2.0. If a copy of the MPL was not distributed with this
 * file, You can obtain one at http://mozilla.org/MPL/2.0/. */

extern crate app_units;
extern crate euclid;
extern crate gleam;
extern crate glutin;
extern crate webrender;

use app_units::Au;
use gleam::gl;
use glutin::GlContext;
use std::fs::File;
use std::io::Read;
use webrender::api::*;

struct Notifier {
    events_proxy: glutin::EventsLoopProxy,
}

impl Notifier {
    fn new(events_proxy: glutin::EventsLoopProxy) -> Notifier {
        Notifier { events_proxy }
    }
}

impl RenderNotifier for Notifier {
    fn clone(&self) -> Box<RenderNotifier> {
        Box::new(Notifier {
            events_proxy: self.events_proxy.clone(),
        })
    }

    fn wake_up(&self) {
        #[cfg(not(target_os = "android"))]
        let _ = self.events_proxy.wakeup();
    }

    fn new_document_ready(&self, _: DocumentId, _scrolled: bool, _composite_needed: bool) {
        self.wake_up();
    }
}

struct Window {
    events_loop: glutin::EventsLoop, //TODO: share events loop?
    window: glutin::GlWindow,
    renderer: webrender::Renderer,
    name: &'static str,
    pipeline_id: PipelineId,
    document_id: DocumentId,
    epoch: Epoch,
    api: RenderApi,
    font_instance_key: FontInstanceKey,
}

impl Window {
    fn new(name: &'static str, clear_color: ColorF) -> Self {
        let events_loop = glutin::EventsLoop::new();
        let context_builder = glutin::ContextBuilder::new()
            .with_gl(glutin::GlRequest::GlThenGles {
                opengl_version: (3, 2),
                opengles_version: (3, 0),
            });
        let window_builder = glutin::WindowBuilder::new()
            .with_title(name)
            .with_multitouch()
            .with_dimensions(800, 600);
        let window = glutin::GlWindow::new(window_builder, context_builder, &events_loop)
            .unwrap();

        unsafe {
            window.make_current().ok();
        }

        let gl = match window.get_api() {
            glutin::Api::OpenGl => unsafe {
                gl::GlFns::load_with(|symbol| window.get_proc_address(symbol) as *const _)
            },
            glutin::Api::OpenGlEs => unsafe {
                gl::GlesFns::load_with(|symbol| window.get_proc_address(symbol) as *const _)
            },
            glutin::Api::WebGl => unimplemented!(),
        };

        let device_pixel_ratio = window.hidpi_factor();

        let opts = webrender::RendererOptions {
            debug: true,
            device_pixel_ratio,
            clear_color: Some(clear_color),
            ..webrender::RendererOptions::default()
        };

        let framebuffer_size = {
            let (width, height) = window.get_inner_size().unwrap();
            DeviceUintSize::new(width, height)
        };
        let notifier = Box::new(Notifier::new(events_loop.create_proxy()));
        let (renderer, sender) = webrender::Renderer::new(gl.clone(), notifier, opts).unwrap();
        let api = sender.create_api();
        let document_id = api.add_document(framebuffer_size, 0);

        let epoch = Epoch(0);
        let pipeline_id = PipelineId(0, 0);
        let mut resources = ResourceUpdates::new();

        let font_key = api.generate_font_key();
        let font_bytes = load_file("../wrench/reftests/text/FreeSans.ttf");
        resources.add_raw_font(font_key, font_bytes, 0);

        let font_instance_key = api.generate_font_instance_key();
        resources.add_font_instance(font_instance_key, font_key, Au::from_px(32), None, None, Vec::new());

        let mut txn = Transaction::new();
        txn.update_resources(resources);
        api.send_transaction(document_id, txn);

        Window {
            events_loop,
            window,
            renderer,
            name,
            epoch,
            pipeline_id,
            document_id,
            api,
            font_instance_key,
        }
    }

    fn tick(&mut self) -> bool {
        unsafe {
            self.window.make_current().ok();
        }
        let mut do_exit = false;
        let my_name = &self.name;
        let renderer = &mut self.renderer;

        self.events_loop.poll_events(|global_event| match global_event {
            glutin::Event::WindowEvent { event, .. } => match event {
                glutin::WindowEvent::Closed |
                glutin::WindowEvent::KeyboardInput {
                    input: glutin::KeyboardInput {
                        virtual_keycode: Some(glutin::VirtualKeyCode::Escape),
                        ..
                    },
                    ..
                } => {
                    do_exit = true
                }
                glutin::WindowEvent::KeyboardInput {
                    input: glutin::KeyboardInput {
                        state: glutin::ElementState::Pressed,
                        virtual_keycode: Some(glutin::VirtualKeyCode::P),
                        ..
                    },
                    ..
                } => {
                    println!("toggle flags {}", my_name);
                    renderer.toggle_debug_flags(webrender::DebugFlags::PROFILER_DBG);
                }
                _ => {}
            }
            _ => {}
        });
        if do_exit {
            return true
        }

        let framebuffer_size = {
            let (width, height) = self.window.get_inner_size().unwrap();
            DeviceUintSize::new(width, height)
        };
        let device_pixel_ratio = self.window.hidpi_factor();
        let layout_size = framebuffer_size.to_f32() / euclid::TypedScale::new(device_pixel_ratio);
        let mut txn = Transaction::new();
        let mut builder = DisplayListBuilder::new(self.pipeline_id, layout_size);

        let bounds = LayoutRect::new(LayoutPoint::zero(), builder.content_size());
        let info = LayoutPrimitiveInfo::new(bounds);
        builder.push_stacking_context(
            &info,
            ScrollPolicy::Scrollable,
            None,
            TransformStyle::Flat,
            None,
            MixBlendMode::Normal,
            Vec::new(),
        );

        let info = LayoutPrimitiveInfo::new(LayoutRect::new(
            LayoutPoint::new(100.0, 100.0),
            LayoutSize::new(100.0, 200.0)
        ));
        builder.push_rect(&info, ColorF::new(0.0, 1.0, 0.0, 1.0));

        let text_bounds = LayoutRect::new(
            LayoutPoint::new(100.0, 50.0),
            LayoutSize::new(700.0, 200.0)
        );
        let glyphs = vec![
            GlyphInstance {
                index: 48,
                point: LayoutPoint::new(100.0, 100.0),
            },
            GlyphInstance {
                index: 68,
                point: LayoutPoint::new(150.0, 100.0),
            },
            GlyphInstance {
                index: 80,
                point: LayoutPoint::new(200.0, 100.0),
            },
            GlyphInstance {
                index: 82,
                point: LayoutPoint::new(250.0, 100.0),
            },
            GlyphInstance {
                index: 81,
                point: LayoutPoint::new(300.0, 100.0),
            },
            GlyphInstance {
                index: 3,
                point: LayoutPoint::new(350.0, 100.0),
            },
            GlyphInstance {
                index: 86,
                point: LayoutPoint::new(400.0, 100.0),
            },
            GlyphInstance {
                index: 79,
                point: LayoutPoint::new(450.0, 100.0),
            },
            GlyphInstance {
                index: 72,
                point: LayoutPoint::new(500.0, 100.0),
            },
            GlyphInstance {
                index: 83,
                point: LayoutPoint::new(550.0, 100.0),
            },
            GlyphInstance {
                index: 87,
                point: LayoutPoint::new(600.0, 100.0),
            },
            GlyphInstance {
                index: 17,
                point: LayoutPoint::new(650.0, 100.0),
            },
        ];

        let info = LayoutPrimitiveInfo::new(text_bounds);
        builder.push_text(
            &info,
            &glyphs,
            self.font_instance_key,
            ColorF::new(1.0, 1.0, 0.0, 1.0),
            None,
        );

        builder.pop_stacking_context();

        txn.set_display_list(
            self.epoch,
            None,
            layout_size,
            builder.finalize(),
            true,
        );
        txn.set_root_pipeline(self.pipeline_id);
        txn.generate_frame();
        self.api.send_transaction(self.document_id, txn);

        renderer.update();
        renderer.render(framebuffer_size).unwrap();
        self.window.swap_buffers().ok();

        false
    }

    fn deinit(self) {
        self.renderer.deinit();
    }
}

fn main() {
    let mut win1 = Window::new("window1", ColorF::new(0.3, 0.0, 0.0, 1.0));
    let mut win2 = Window::new("window2", ColorF::new(0.0, 0.3, 0.0, 1.0));

    loop {
        if win1.tick() {
            break;
        }
        if win2.tick() {
            break;
        }
    }

    win1.deinit();
    win2.deinit();
}

fn load_file(name: &str) -> Vec<u8> {
    let mut file = File::open(name).unwrap();
    let mut buffer = vec![];
    file.read_to_end(&mut buffer).unwrap();
    buffer
}