wrench/src/main.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/. */

#[macro_use]
extern crate clap;
#[macro_use]
extern crate log;
#[macro_use]
extern crate serde;
#[macro_use]
extern crate tracy_rs;

mod angle;
mod blob;
mod egl;
mod parse_function;
mod perf;
mod png;
mod premultiply;
mod rawtest;
mod reftest;
mod test_invalidation;
mod test_shaders;
mod wrench;
mod yaml_frame_reader;
mod yaml_helper;

use gleam::gl;
#[cfg(feature = "software")]
use gleam::gl::Gl;
use crate::perf::PerfHarness;
use crate::png::save_flipped;
use crate::rawtest::RawtestHarness;
use crate::reftest::{ReftestHarness, ReftestOptions};
use std::fs;
#[cfg(feature = "headless")]
use std::ffi::CString;
#[cfg(feature = "headless")]
use std::mem;
use std::os::raw::c_void;
use std::path::{Path, PathBuf};
use std::process;
use std::ptr;
use std::rc::Rc;
#[cfg(feature = "software")]
use std::slice;
use std::sync::mpsc::{channel, Sender, Receiver};
use webrender::DebugFlags;
use webrender::api::*;
use webrender::render_api::*;
use webrender::api::units::*;
use winit::dpi::{LogicalPosition, LogicalSize};
use winit::VirtualKeyCode;
use crate::wrench::{CapturedSequence, Wrench, WrenchThing};
use crate::yaml_frame_reader::YamlFrameReader;

pub const PLATFORM_DEFAULT_FACE_NAME: &str = "Arial";

pub static mut CURRENT_FRAME_NUMBER: u32 = 0;

#[cfg(feature = "headless")]
pub struct HeadlessContext {
    width: i32,
    height: i32,
    _context: osmesa_sys::OSMesaContext,
    _buffer: Vec<u32>,
}

#[cfg(not(feature = "headless"))]
pub struct HeadlessContext {
    width: i32,
    height: i32,
}

impl HeadlessContext {
    #[cfg(feature = "headless")]
    fn new(width: i32, height: i32) -> Self {
        let mut attribs = Vec::new();

        attribs.push(osmesa_sys::OSMESA_PROFILE);
        attribs.push(osmesa_sys::OSMESA_CORE_PROFILE);
        attribs.push(osmesa_sys::OSMESA_CONTEXT_MAJOR_VERSION);
        attribs.push(3);
        attribs.push(osmesa_sys::OSMESA_CONTEXT_MINOR_VERSION);
        attribs.push(3);
        attribs.push(osmesa_sys::OSMESA_DEPTH_BITS);
        attribs.push(24);
        attribs.push(0);

        let context =
            unsafe { osmesa_sys::OSMesaCreateContextAttribs(attribs.as_ptr(), ptr::null_mut()) };

        assert!(!context.is_null());

        let mut buffer = vec![0; (width * height) as usize];

        unsafe {
            let ret = osmesa_sys::OSMesaMakeCurrent(
                context,
                buffer.as_mut_ptr() as *mut _,
                gl::UNSIGNED_BYTE,
                width,
                height,
            );
            assert!(ret != 0);
        };

        HeadlessContext {
            width,
            height,
            _context: context,
            _buffer: buffer,
        }
    }

    #[cfg(not(feature = "headless"))]
    fn new(width: i32, height: i32) -> Self {
        HeadlessContext { width, height }
    }

    #[cfg(feature = "headless")]
    fn get_proc_address(s: &str) -> *const c_void {
        let c_str = CString::new(s).expect("Unable to create CString");
        unsafe { mem::transmute(osmesa_sys::OSMesaGetProcAddress(c_str.as_ptr())) }
    }

    #[cfg(not(feature = "headless"))]
    fn get_proc_address(_: &str) -> *const c_void {
        ptr::null() as *const _
    }
}

#[cfg(not(feature = "software"))]
mod swgl {
    pub struct Context;
}

pub enum WindowWrapper {
    WindowedContext(glutin::WindowedContext<glutin::PossiblyCurrent>, Rc<dyn gl::Gl>, Option<swgl::Context>),
    Angle(winit::Window, angle::Context, Rc<dyn gl::Gl>, Option<swgl::Context>),
    Headless(HeadlessContext, Rc<dyn gl::Gl>, Option<swgl::Context>),
}

pub struct HeadlessEventIterater;

impl WindowWrapper {
    #[cfg(feature = "software")]
    fn upload_software_to_native(&self) {
        if matches!(*self, WindowWrapper::Headless(..)) { return }
        let swgl = match self.software_gl() {
            Some(swgl) => swgl,
            None => return,
        };
        swgl.finish();
        let gl = self.native_gl();
        let tex = gl.gen_textures(1)[0];
        gl.bind_texture(gl::TEXTURE_2D, tex);
        let (data_ptr, w, h, stride) = swgl.get_color_buffer(0, true);
        assert!(stride == w * 4);
        let buffer = unsafe { slice::from_raw_parts(data_ptr as *const u8, w as usize * h as usize * 4) };
        gl.tex_image_2d(gl::TEXTURE_2D, 0, gl::RGBA8 as gl::GLint, w, h, 0, gl::BGRA, gl::UNSIGNED_BYTE, Some(buffer));
        let fb = gl.gen_framebuffers(1)[0];
        gl.bind_framebuffer(gl::READ_FRAMEBUFFER, fb);
        gl.framebuffer_texture_2d(gl::READ_FRAMEBUFFER, gl::COLOR_ATTACHMENT0, gl::TEXTURE_2D, tex, 0);
        gl.blit_framebuffer(0, 0, w, h, 0, 0, w, h, gl::COLOR_BUFFER_BIT, gl::NEAREST);
        gl.delete_framebuffers(&[fb]);
        gl.delete_textures(&[tex]);
        gl.finish();
    }

    #[cfg(not(feature = "software"))]
    fn upload_software_to_native(&self) {
    }

    fn swap_buffers(&self) {
        match *self {
            WindowWrapper::WindowedContext(ref windowed_context, _, _) => {
                windowed_context.swap_buffers().unwrap()
            }
            WindowWrapper::Angle(_, ref context, _, _) => context.swap_buffers().unwrap(),
            WindowWrapper::Headless(_, _, _) => {}
        }
    }

    fn get_inner_size(&self) -> DeviceIntSize {
        fn inner_size(window: &winit::Window) -> DeviceIntSize {
            let size = window
                .get_inner_size()
                .unwrap()
                .to_physical(window.get_hidpi_factor());
            DeviceIntSize::new(size.width as i32, size.height as i32)
        }
        match *self {
            WindowWrapper::WindowedContext(ref windowed_context, ..) => {
                inner_size(windowed_context.window())
            }
            WindowWrapper::Angle(ref window, ..) => inner_size(window),
            WindowWrapper::Headless(ref context, ..) => DeviceIntSize::new(context.width, context.height),
        }
    }

    fn hidpi_factor(&self) -> f32 {
        match *self {
            WindowWrapper::WindowedContext(ref windowed_context, ..) => {
                windowed_context.window().get_hidpi_factor() as f32
            }
            WindowWrapper::Angle(ref window, ..) => window.get_hidpi_factor() as f32,
            WindowWrapper::Headless(..) => 1.0,
        }
    }

    fn resize(&mut self, size: DeviceIntSize) {
        match *self {
            WindowWrapper::WindowedContext(ref mut windowed_context, ..) => {
                windowed_context.window()
                    .set_inner_size(LogicalSize::new(size.width as f64, size.height as f64))
            },
            WindowWrapper::Angle(ref mut window, ..) => {
                window.set_inner_size(LogicalSize::new(size.width as f64, size.height as f64))
            },
            WindowWrapper::Headless(..) => unimplemented!(), // requites Glutin update
        }
    }

    fn set_title(&mut self, title: &str) {
        match *self {
            WindowWrapper::WindowedContext(ref windowed_context, ..) => {
                windowed_context.window().set_title(title)
            }
            WindowWrapper::Angle(ref window, ..) => window.set_title(title),
            WindowWrapper::Headless(..) => (),
        }
    }

    pub fn software_gl(&self) -> Option<&swgl::Context> {
        match *self {
            WindowWrapper::WindowedContext(_, _, ref swgl) |
            WindowWrapper::Angle(_, _, _, ref swgl) |
            WindowWrapper::Headless(_, _, ref swgl) => swgl.as_ref(),
        }
    }

    pub fn native_gl(&self) -> &dyn gl::Gl {
        match *self {
            WindowWrapper::WindowedContext(_, ref gl, _) |
            WindowWrapper::Angle(_, _, ref gl, _) |
            WindowWrapper::Headless(_, ref gl, _) => &**gl,
        }
    }

    #[cfg(feature = "software")]
    pub fn gl(&self) -> &dyn gl::Gl {
        if let Some(swgl) = self.software_gl() {
            swgl
        } else {
            self.native_gl()
        }
    }

    pub fn is_software(&self) -> bool {
        self.software_gl().is_some()
    }

    #[cfg(not(feature = "software"))]
    pub fn gl(&self) -> &dyn gl::Gl {
        self.native_gl()
    }

    pub fn clone_gl(&self) -> Rc<dyn gl::Gl> {
        match *self {
            WindowWrapper::WindowedContext(_, ref gl, ref swgl) |
            WindowWrapper::Angle(_, _, ref gl, ref swgl) |
            WindowWrapper::Headless(_, ref gl, ref swgl) => {
                match swgl {
                    #[cfg(feature = "software")]
                    Some(ref swgl) => Rc::new(*swgl),
                    None => gl.clone(),
                    #[cfg(not(feature = "software"))]
                    _ => panic!(),
                }
            }
        }
    }


    #[cfg(feature = "software")]
    fn update_software(&self, dim: DeviceIntSize) {
        if let Some(swgl) = self.software_gl() {
            swgl.init_default_framebuffer(0, 0, dim.width, dim.height, 0, std::ptr::null_mut());
        }
    }

    #[cfg(not(feature = "software"))]
    fn update_software(&self, _dim: DeviceIntSize) {
    }

    fn update(&self, wrench: &mut Wrench) {
        let dim = self.get_inner_size();
        self.update_software(dim);
        wrench.update(dim);
    }
}

#[cfg(feature = "software")]
fn make_software_context() -> swgl::Context {
    let ctx = swgl::Context::create();
    ctx.make_current();
    ctx
}

#[cfg(not(feature = "software"))]
fn make_software_context() -> swgl::Context {
    panic!("software feature not enabled")
}

fn make_window(
    size: DeviceIntSize,
    vsync: bool,
    events_loop: &Option<winit::EventsLoop>,
    angle: bool,
    gl_request: glutin::GlRequest,
    software: bool,
) -> WindowWrapper {
    let sw_ctx = if software {
        Some(make_software_context())
    } else {
        None
    };

    let wrapper = if let Some(events_loop) = events_loop {
        let context_builder = glutin::ContextBuilder::new()
            .with_gl(gl_request)
            .with_vsync(vsync);
        let window_builder = winit::WindowBuilder::new()
            .with_title("WRench")
            .with_multitouch()
            .with_dimensions(LogicalSize::new(size.width as f64, size.height as f64));

        if angle {
            angle::Context::with_window(
                window_builder, context_builder, events_loop
            ).map(|(_window, _context)| {
                unsafe {
                    _context
                        .make_current()
                        .expect("unable to make context current!");
                }

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

                WindowWrapper::Angle(_window, _context, gl, sw_ctx)
            }).unwrap()
        } else {
            let windowed_context = context_builder
                .build_windowed(window_builder, events_loop)
                .unwrap();

            let windowed_context = unsafe {
                windowed_context
                    .make_current()
                    .expect("unable to make context current!")
            };

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

            WindowWrapper::WindowedContext(windowed_context, gl, sw_ctx)
        }
    } else {
        #[cfg_attr(not(feature = "software"), allow(unused_variables))]
        let gl = if let Some(sw_ctx) = sw_ctx {
            #[cfg(feature = "software")]
            {
                Rc::new(sw_ctx)
            }
            #[cfg(not(feature = "software"))]
            {
                unreachable!("make_software_context() should have failed if 'software' feature is not enabled")
            }
        } else {
            match gl::GlType::default() {
                gl::GlType::Gl => unsafe {
                    gl::GlFns::load_with(|symbol| {
                        HeadlessContext::get_proc_address(symbol) as *const _
                    })
                },
                gl::GlType::Gles => unsafe {
                    gl::GlesFns::load_with(|symbol| {
                        HeadlessContext::get_proc_address(symbol) as *const _
                    })
                },
            }
        };
        WindowWrapper::Headless(HeadlessContext::new(size.width, size.height), gl, sw_ctx)
    };

    let gl = wrapper.gl();

    gl.clear_color(0.3, 0.0, 0.0, 1.0);

    let gl_version = gl.get_string(gl::VERSION);
    let gl_renderer = gl.get_string(gl::RENDERER);

    println!("OpenGL version {}, {}", gl_version, gl_renderer);
    println!(
        "hidpi factor: {}",
        wrapper.hidpi_factor()
    );

    wrapper
}

#[derive(Copy, Clone, Debug, PartialEq, Eq)]
pub enum NotifierEvent {
    WakeUp {
        composite_needed: bool,
    },
    ShutDown,
}

struct Notifier {
    tx: Sender<NotifierEvent>,
}

// setup a notifier so we can wait for frames to be finished
impl RenderNotifier for Notifier {
    fn clone(&self) -> Box<dyn RenderNotifier> {
        Box::new(Notifier {
            tx: self.tx.clone(),
        })
    }

    fn wake_up(
        &self,
        composite_needed: bool,
    ) {
        let msg = NotifierEvent::WakeUp {
            composite_needed,
        };
        self.tx.send(msg).unwrap();
    }

    fn shut_down(&self) {
        self.tx.send(NotifierEvent::ShutDown).unwrap();
    }

    fn new_frame_ready(&self,
                       _: DocumentId,
                       _scrolled: bool,
                       composite_needed: bool,
                       _render_time: Option<u64>) {
        // TODO(gw): Refactor wrench so that it can take advantage of cases
        //           where no composite is required when appropriate.
        self.wake_up(composite_needed);
    }
}

fn create_notifier() -> (Box<dyn RenderNotifier>, Receiver<NotifierEvent>) {
    let (tx, rx) = channel();
    (Box::new(Notifier { tx }), rx)
}

fn rawtest(mut wrench: Wrench, window: &mut WindowWrapper, rx: Receiver<NotifierEvent>) {
    RawtestHarness::new(&mut wrench, window, &rx).run();
    wrench.shut_down(rx);
}

fn reftest<'a>(
    mut wrench: Wrench,
    window: &mut WindowWrapper,
    subargs: &clap::ArgMatches<'a>,
    rx: Receiver<NotifierEvent>
) -> usize {
    let dim = window.get_inner_size();
    let base_manifest = if cfg!(target_os = "android") {
        Path::new("/sdcard/wrench/reftests/reftest.list")
    } else {
        Path::new("reftests/reftest.list")
    };
    let specific_reftest = subargs.value_of("REFTEST").map(Path::new);
    let mut reftest_options = ReftestOptions::default();
    if let Some(allow_max_diff) = subargs.value_of("fuzz_tolerance") {
        reftest_options.allow_max_difference = allow_max_diff.parse().unwrap_or(1);
        reftest_options.allow_num_differences = dim.width as usize * dim.height as usize;
    }
    let num_failures = ReftestHarness::new(&mut wrench, window, &rx)
        .run(base_manifest, specific_reftest, &reftest_options);
    wrench.shut_down(rx);
    num_failures
}

fn main() {
    #[cfg(feature = "env_logger")]
    env_logger::init();

    #[cfg(target_os = "macos")]
    {
        use core_foundation::{self as cf, base::TCFType};
        let i = cf::bundle::CFBundle::main_bundle().info_dictionary();
        let mut i = unsafe { i.to_mutable() };
        i.set(
            cf::string::CFString::new("NSSupportsAutomaticGraphicsSwitching"),
            cf::boolean::CFBoolean::true_value().into_CFType(),
        );
    }

    let args_yaml = load_yaml!("args.yaml");
    let clap = clap::App::from_yaml(args_yaml)
        .setting(clap::AppSettings::ArgRequiredElseHelp);

    // On android devices, attempt to read command line arguments
    // from a text file located at /sdcard/wrench/args.
    let args = if cfg!(target_os = "android") {
        // get full backtraces by default because it's hard to request
        // externally on android
        std::env::set_var("RUST_BACKTRACE", "full");

        let mut args = vec!["wrench".to_string()];

        if let Ok(wrench_args) = fs::read_to_string("/sdcard/wrench/args") {
            for line in wrench_args.lines() {
                if let Some(envvar) = line.strip_prefix("env: ") {
                    if let Some((lhs, rhs)) = envvar.split_once('=') {
                        std::env::set_var(lhs, rhs);
                    } else {
                        std::env::set_var(envvar, "");
                    }

                    continue;
                }
                for arg in line.split_whitespace() {
                    args.push(arg.to_string());
                }
            }
        }

        clap.get_matches_from(&args)
    } else {
        clap.get_matches()
    };

    // handle some global arguments
    let res_path = args.value_of("shaders").map(PathBuf::from);
    let size = args.value_of("size")
        .map(|s| if s == "720p" {
            DeviceIntSize::new(1280, 720)
        } else if s == "1080p" {
            DeviceIntSize::new(1920, 1080)
        } else if s == "4k" {
            DeviceIntSize::new(3840, 2160)
        } else {
            let x = s.find('x').expect(
                "Size must be specified exactly as 720p, 1080p, 4k, or width x height",
            );
            let w = s[0 .. x].parse::<i32>().expect("Invalid size width");
            let h = s[x + 1 ..].parse::<i32>().expect("Invalid size height");
            DeviceIntSize::new(w, h)
        })
        .unwrap_or(DeviceIntSize::new(1920, 1080));
    let chase_primitive = match args.value_of("chase") {
        Some(s) => {
            if s.contains(',') {
                let items = s
                    .split(',')
                    .map(|s| s.parse::<f32>().unwrap())
                    .collect::<Vec<_>>();
                let rect = LayoutRect::from_origin_and_size(
                    LayoutPoint::new(items[0], items[1]),
                    LayoutSize::new(items[2], items[3]),
                );
                webrender::ChasePrimitive::LocalRect(rect)
            } else {
                let id = s.parse::<usize>().unwrap();
                webrender::ChasePrimitive::Id(webrender::PrimitiveDebugId(id))
            }
        }
        None => webrender::ChasePrimitive::Nothing,
    };

    let dump_shader_source = args.value_of("dump_shader_source").map(String::from);

    let mut events_loop = if args.is_present("headless") {
        None
    } else {
        Some(winit::EventsLoop::new())
    };

    let gl_request = match args.value_of("renderer") {
        Some("es3") => {
            glutin::GlRequest::Specific(glutin::Api::OpenGlEs, (3, 0))
        }
        Some("gl3") => {
            glutin::GlRequest::Specific(glutin::Api::OpenGl, (3, 2))
        }
        Some("default") | None => {
            glutin::GlRequest::GlThenGles {
                opengl_version: (3, 2),
                opengles_version: (3, 0),
            }
        }
        Some(api) => {
            panic!("Unexpected renderer string {}", api);
        }
    };

    let software = args.is_present("software");

    let mut window = make_window(
        size,
        args.is_present("vsync"),
        &events_loop,
        args.is_present("angle"),
        gl_request,
        software,
    );
    let dim = window.get_inner_size();

    let needs_frame_notifier = args.subcommand_name().map_or(false, |name| {
        ["perf", "reftest", "png", "rawtest", "test_invalidation"].contains(&name)
    });
    let (notifier, rx) = if needs_frame_notifier {
        let (notifier, rx) = create_notifier();
        (Some(notifier), Some(rx))
    } else {
        (None, None)
    };

    let mut wrench = Wrench::new(
        &mut window,
        events_loop.as_mut().map(|el| el.create_proxy()),
        res_path,
        !args.is_present("use_unoptimized_shaders"),
        dim,
        args.is_present("rebuild"),
        args.is_present("no_subpixel_aa"),
        args.is_present("verbose"),
        args.is_present("no_scissor"),
        args.is_present("no_batch"),
        args.is_present("precache"),
        args.is_present("slow_subpixel"),
        chase_primitive,
        dump_shader_source,
        notifier,
    );

    if let Some(ui_str) = args.value_of("profiler_ui") {
        wrench.renderer.set_profiler_ui(ui_str);
    }

    window.update(&mut wrench);

    if let Some(window_title) = wrench.take_title() {
        if !cfg!(windows) {
            window.set_title(&window_title);
        }
    }

    if let Some(subargs) = args.subcommand_matches("show") {
        let no_block = args.is_present("no_block");
        let no_batch = args.is_present("no_batch");
        render(
            &mut wrench,
            &mut window,
            size,
            &mut events_loop,
            subargs,
            no_block,
            no_batch,
        );
    } else if let Some(subargs) = args.subcommand_matches("png") {
        let surface = match subargs.value_of("surface") {
            Some("screen") | None => png::ReadSurface::Screen,
            Some("gpu-cache") => png::ReadSurface::GpuCache,
            _ => panic!("Unknown surface argument value")
        };
        let output_path = subargs.value_of("OUTPUT").map(PathBuf::from);
        let reader = YamlFrameReader::new_from_args(subargs);
        png::png(&mut wrench, surface, &mut window, reader, rx.unwrap(), output_path);
    } else if let Some(subargs) = args.subcommand_matches("reftest") {
        // Exit with an error code in order to ensure the CI job fails.
        process::exit(reftest(wrench, &mut window, subargs, rx.unwrap()) as _);
    } else if args.subcommand_matches("rawtest").is_some() {
        rawtest(wrench, &mut window, rx.unwrap());
        return;
    } else if let Some(subargs) = args.subcommand_matches("perf") {
        // Perf mode wants to benchmark the total cost of drawing
        // a new displaty list each frame.
        wrench.rebuild_display_lists = true;

        let as_csv = subargs.is_present("csv");
        let auto_filename = subargs.is_present("auto-filename");

        let warmup_frames = subargs.value_of("warmup_frames").map(|s| s.parse().unwrap());
        let sample_count = subargs.value_of("sample_count").map(|s| s.parse().unwrap());

        let harness = PerfHarness::new(&mut wrench,
                                       &mut window,
                                       rx.unwrap(),
                                       warmup_frames,
                                       sample_count);

        let benchmark = subargs.value_of("benchmark").unwrap_or("benchmarks/benchmarks.list");
        println!("Benchmark: {}", benchmark);
        let base_manifest = Path::new(benchmark);

        let mut filename = subargs.value_of("filename").unwrap().to_string();
        if auto_filename {
            let timestamp = chrono::Local::now().format("%Y-%m-%d-%H-%M-%S");
            filename.push_str(
                &format!("/wrench-perf-{}.{}",
                            timestamp,
                            if as_csv { "csv" } else { "json" }));
        }
        harness.run(base_manifest, &filename, as_csv);
        return;
    } else if args.subcommand_matches("test_invalidation").is_some() {
        let harness = test_invalidation::TestHarness::new(
            &mut wrench,
            &mut window,
            rx.unwrap(),
        );

        harness.run();
    } else if let Some(subargs) = args.subcommand_matches("compare_perf") {
        let first_filename = subargs.value_of("first_filename").unwrap();
        let second_filename = subargs.value_of("second_filename").unwrap();
        perf::compare(first_filename, second_filename);
        return;
    } else if args.subcommand_matches("test_init").is_some() {
        // Wrench::new() unwraps the Renderer initialization, so if
        // we reach this point then we have initialized successfully.
        println!("Initialization successful");
    } else if args.subcommand_matches("test_shaders").is_some() {
        test_shaders::test_shaders();
    } else {
        panic!("Should never have gotten here! {:?}", args);
    };

    wrench.renderer.deinit();

    // On android force-exit the process otherwise it stays running forever.
    #[cfg(target_os = "android")]
    process::exit(0);
}

fn render<'a>(
    wrench: &mut Wrench,
    window: &mut WindowWrapper,
    size: DeviceIntSize,
    events_loop: &mut Option<winit::EventsLoop>,
    subargs: &clap::ArgMatches<'a>,
    no_block: bool,
    no_batch: bool,
) {
    let input_path = subargs.value_of("INPUT").map(PathBuf::from).unwrap();

    // If the input is a directory, we are looking at a capture.
    let mut thing = if input_path.join("scenes").as_path().is_dir() {
        let scene_id = subargs.value_of("scene-id").map(|z| z.parse::<u32>().unwrap());
        let frame_id = subargs.value_of("frame-id").map(|z| z.parse::<u32>().unwrap());
        Box::new(CapturedSequence::new(
            input_path,
            scene_id.unwrap_or(1),
            frame_id.unwrap_or(1),
        ))
    } else if input_path.as_path().is_dir() {
        let mut documents = wrench.api.load_capture(input_path, None);
        println!("loaded {:?}", documents.iter().map(|cd| cd.document_id).collect::<Vec<_>>());
        let captured = documents.swap_remove(0);
        wrench.document_id = captured.document_id;
        Box::new(captured) as Box<dyn WrenchThing>
    } else {
        match input_path.extension().and_then(std::ffi::OsStr::to_str) {
            Some("yaml") => {
                Box::new(YamlFrameReader::new_from_args(subargs)) as Box<dyn WrenchThing>
            }
            _ => panic!("Tried to render with an unknown file type."),
        }
    };

    let mut show_help = false;
    let mut do_loop = false;
    let mut cursor_position = WorldPoint::zero();

    window.update(wrench);
    thing.do_frame(wrench);

    if let Some(fb_size) = wrench.renderer.device_size() {
        window.resize(fb_size);
    }

    let mut debug_flags = DebugFlags::empty();
    debug_flags.set(DebugFlags::DISABLE_BATCHING, no_batch);

    // Default the profile overlay on for android.
    if cfg!(target_os = "android") {
        debug_flags.toggle(DebugFlags::PROFILER_DBG);
        wrench.api.send_debug_cmd(DebugCommand::SetFlags(debug_flags));
    }

    let mut body = |wrench: &mut Wrench, events: Vec<winit::Event>| {
        let mut do_frame = false;
        let mut do_render = !events.is_empty();

        for event in events {
            match event {
                winit::Event::Awakened => {}
                winit::Event::WindowEvent { event, .. } => match event {
                    winit::WindowEvent::CloseRequested => {
                        return winit::ControlFlow::Break;
                    }
                    winit::WindowEvent::Refresh |
                    winit::WindowEvent::Focused(..) => {}
                    winit::WindowEvent::CursorMoved { position: LogicalPosition { x, y }, .. } => {
                        cursor_position = WorldPoint::new(x as f32, y as f32);
                        wrench.renderer.set_cursor_position(
                            DeviceIntPoint::new(
                                cursor_position.x.round() as i32,
                                cursor_position.y.round() as i32,
                            ),
                        );
                    }
                    winit::WindowEvent::KeyboardInput {
                        input: winit::KeyboardInput {
                            state: winit::ElementState::Pressed,
                            virtual_keycode: Some(vk),
                            ..
                        },
                        ..
                    } => match vk {
                        VirtualKeyCode::Escape => {
                            return winit::ControlFlow::Break;
                        }
                        VirtualKeyCode::B => {
                            debug_flags.toggle(DebugFlags::INVALIDATION_DBG);
                            wrench.api.send_debug_cmd(DebugCommand::SetFlags(debug_flags));
                        }
                        VirtualKeyCode::P => {
                            debug_flags.toggle(DebugFlags::PROFILER_DBG);
                            wrench.api.send_debug_cmd(DebugCommand::SetFlags(debug_flags));
                        }
                        VirtualKeyCode::O => {
                            debug_flags.toggle(DebugFlags::RENDER_TARGET_DBG);
                            wrench.api.send_debug_cmd(DebugCommand::SetFlags(debug_flags));
                        }
                        VirtualKeyCode::I => {
                            debug_flags.toggle(DebugFlags::TEXTURE_CACHE_DBG);
                            wrench.api.send_debug_cmd(DebugCommand::SetFlags(debug_flags));
                        }
                        VirtualKeyCode::D => {
                            debug_flags.toggle(DebugFlags::PICTURE_CACHING_DBG);
                            wrench.api.send_debug_cmd(DebugCommand::SetFlags(debug_flags));
                        }
                        VirtualKeyCode::Q => {
                            debug_flags.toggle(DebugFlags::GPU_TIME_QUERIES | DebugFlags::GPU_SAMPLE_QUERIES);
                            wrench.api.send_debug_cmd(DebugCommand::SetFlags(debug_flags));
                        }
                        VirtualKeyCode::V => {
                            debug_flags.toggle(DebugFlags::SHOW_OVERDRAW);
                            wrench.api.send_debug_cmd(DebugCommand::SetFlags(debug_flags));
                        }
                        VirtualKeyCode::G => {
                            debug_flags.toggle(DebugFlags::GPU_CACHE_DBG);
                            wrench.api.send_debug_cmd(DebugCommand::SetFlags(debug_flags));

                            // force scene rebuild to see the full set of used GPU cache entries
                            let mut txn = Transaction::new();
                            txn.set_root_pipeline(wrench.root_pipeline_id);
                            wrench.api.send_transaction(wrench.document_id, txn);

                            do_render = false;
                            do_frame = true;
                        }
                        VirtualKeyCode::M => {
                            wrench.api.notify_memory_pressure();
                        }
                        VirtualKeyCode::L => {
                            do_loop = !do_loop;
                        }
                        VirtualKeyCode::Left => {
                            thing.prev_frame();
                            do_render = false;
                            do_frame = true;
                        }
                        VirtualKeyCode::Right => {
                            thing.next_frame();
                            do_render = false;
                            do_frame = true;
                        }
                        VirtualKeyCode::H => {
                            show_help = !show_help;
                        }
                        VirtualKeyCode::C => {
                            let path = PathBuf::from("../captures/wrench");
                            wrench.api.save_capture(path, CaptureBits::all());
                            do_render = false;
                        }
                        VirtualKeyCode::X => {
                            let results = wrench.api.hit_test(
                                wrench.document_id,
                                cursor_position,
                            );

                            println!("Hit test results:");
                            for item in &results.items {
                                println!("  • {:?}", item);
                            }
                            println!();
                            do_render = false;
                        }
                        VirtualKeyCode::Z => {
                            debug_flags.toggle(DebugFlags::ZOOM_DBG);
                            wrench.api.send_debug_cmd(DebugCommand::SetFlags(debug_flags));
                        }
                        VirtualKeyCode::Y => {
                            println!("Clearing all caches...");
                            wrench.api.send_debug_cmd(DebugCommand::ClearCaches(ClearCache::all()));
                            do_frame = true;
                        }
                        _other_virtual_keycode => { do_render = false; }
                    }
                    _other_window_event => { do_render = false; }
                },
                _other_event => { do_render = false; }
            }
        }

        window.update(wrench);

        if do_frame {
            let frame_num = thing.do_frame(wrench);
            unsafe {
                CURRENT_FRAME_NUMBER = frame_num;
            }
        }

        if do_render {
            if show_help {
                wrench.show_onscreen_help();
            }

            wrench.render();
            window.upload_software_to_native();
            window.swap_buffers();

            if do_loop {
                thing.next_frame();
            }
        }

        winit::ControlFlow::Continue
    };

    if let Some(events_loop) = events_loop.as_mut() {
        // We want to ensure that we:
        //
        // (a) Block the thread when no events are present (for CPU/battery purposes)
        // (b) Don't lag the input events by having the event queue back up.
        loop {
            let mut pending_events = Vec::new();

            // Block the thread until at least one event arrives
            // On Android, we are generally profiling when running
            // wrench, and don't want to block on UI events.
            if !no_block && cfg!(not(target_os = "android")) {
                events_loop.run_forever(|event| {
                    pending_events.push(event);
                    winit::ControlFlow::Break
                });
            }

            // Collect any other pending events that are also available
            events_loop.poll_events(|event| {
                pending_events.push(event);
            });

            // Ensure there is at least one event present so that the
            // frame gets rendered.
            if pending_events.is_empty() {
                pending_events.push(winit::Event::Awakened);
            }

            // Process all of those pending events in the next vsync period
            if body(wrench, pending_events) == winit::ControlFlow::Break {
                break;
            }
        }
    } else {
        while body(wrench, vec![winit::Event::Awakened]) == winit::ControlFlow::Continue {}
        let fb_rect = FramebufferIntSize::new(size.width, size.height).into();
        let pixels = wrench.renderer.read_pixels_rgba8(fb_rect);
        save_flipped("screenshot.png", pixels, size);
    }
}