/
osmain.rs
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/
osmain.rs
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/* 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/. */
use ShareGlContext = sharegl::platform::Context;
use dom::event::Event;
use platform::resize_rate_limiter::ResizeRateLimiter;
use azure::azure_hl::{BackendType, B8G8R8A8, DataSourceSurface, DrawTarget, SourceSurfaceMethods};
use core::comm::{Chan, SharedChan, Port};
use core::util;
use geom::matrix::identity;
use geom::point::Point2D;
use geom::rect::Rect;
use geom::size::Size2D;
use gfx::compositor::{Compositor, LayerBuffer, LayerBufferSet};
use gfx::opts::Opts;
use servo_util::time;
use core::cell::Cell;
use glut::glut;
use layers;
use sharegl;
use sharegl::ShareGlContext;
use sharegl::base::ShareContext;
pub struct OSMain {
chan: SharedChan<Msg>
}
impl Clone for OSMain {
fn clone(&self) -> OSMain {
OSMain {
chan: self.chan.clone()
}
}
}
// FIXME: Move me over to opts.rs.
enum Mode {
GlutMode,
ShareMode
}
enum Window {
GlutWindow(glut::Window),
ShareWindow(ShareGlContext)
}
pub enum Msg {
BeginDrawing(comm::Chan<LayerBufferSet>),
Draw(comm::Chan<LayerBufferSet>, LayerBufferSet),
AddKeyHandler(comm::Chan<()>),
Exit
}
pub fn OSMain(dom_event_chan: comm::SharedChan<Event>, opts: Opts) -> OSMain {
let dom_event_chan = Cell(dom_event_chan);
OSMain {
chan: SharedChan(on_osmain::<Msg>(|po| {
let po = Cell(po);
do platform::runmain {
debug!("preparing to enter main loop");
// FIXME: Use the servo options.
let mode;
match os::getenv("SERVO_SHARE") {
Some(_) => mode = ShareMode,
None => mode = GlutMode
}
mainloop(mode, po.take(), dom_event_chan.take(), &opts);
}
}))
}
}
/// Azure surface wrapping to work with the layers infrastructure.
struct AzureDrawTargetImageData {
draw_target: DrawTarget,
data_source_surface: DataSourceSurface,
size: Size2D<uint>
}
impl layers::layers::ImageData for AzureDrawTargetImageData {
fn size(&self) -> Size2D<uint> { self.size }
fn stride(&self) -> uint { self.data_source_surface.get_size().width as uint }
fn format(&self) -> layers::layers::Format {
// FIXME: This is not always correct. We should query the Azure draw target for the format.
layers::layers::ARGB32Format
}
fn with_data(&self, f: layers::layers::WithDataFn) {
do self.data_source_surface.with_data |data| {
f(data);
}
}
}
fn mainloop(mode: Mode,
po: Port<Msg>,
dom_event_chan: SharedChan<Event>,
opts: &Opts) {
let key_handlers: @mut ~[Chan<()>] = @mut ~[];
let window;
match mode {
GlutMode => {
glut::init();
glut::init_display_mode(glut::DOUBLE);
let glut_window = glut::create_window(~"Servo");
glut::reshape_window(glut_window, 800, 600);
window = GlutWindow(glut_window);
}
ShareMode => {
let size = Size2D(800, 600);
let share_context: ShareGlContext = sharegl::base::ShareContext::new(size);
io::println(fmt!("Sharing ID is %d", share_context.id()));
window = ShareWindow(share_context);
}
}
let surfaces = @mut SurfaceSet(opts.render_backend);
let context = layers::rendergl::init_render_context();
let root_layer = @mut layers::layers::ContainerLayer();
let original_layer_transform;
{
let image_data = @layers::layers::BasicImageData::new(Size2D(0u, 0u),
0,
layers::layers::RGB24Format,
~[]);
let image = @mut layers::layers::Image::new(image_data as @layers::layers::ImageData);
let image_layer = @mut layers::layers::ImageLayer(image);
original_layer_transform = image_layer.common.transform;
image_layer.common.set_transform(original_layer_transform.scale(800.0, 600.0, 1.0));
root_layer.add_child(layers::layers::ImageLayerKind(image_layer));
}
let scene = @layers::scene::Scene(layers::layers::ContainerLayerKind(root_layer),
Size2D(800.0, 600.0),
identity());
let done = @mut false;
let resize_rate_limiter = @mut ResizeRateLimiter(dom_event_chan);
let check_for_messages: @fn() = || {
// Periodically check if content responded to our last resize event
resize_rate_limiter.check_resize_response();
// Handle messages
//#debug("osmain: peeking");
while po.peek() {
match po.recv() {
AddKeyHandler(key_ch) => key_handlers.push(key_ch),
BeginDrawing(sender) => lend_surface(surfaces, sender),
Draw(sender, draw_target) => {
debug!("osmain: received new frame");
return_surface(surfaces, draw_target);
lend_surface(surfaces, sender);
// Iterate over the children of the container layer.
let mut current_layer_child = root_layer.first_child;
// Replace the image layer data with the buffer data.
let buffers = util::replace(&mut surfaces.front.layer_buffer_set.buffers, ~[]);
for buffers.each |buffer| {
let width = buffer.rect.size.width as uint;
let height = buffer.rect.size.height as uint;
debug!("osmain: compositing buffer rect %?", &buffer.rect);
let image_data = @AzureDrawTargetImageData {
draw_target: buffer.draw_target.clone(),
data_source_surface: buffer.draw_target.snapshot().get_data_surface(),
size: Size2D(width, height)
};
let image = @mut layers::layers::Image::new(image_data as @layers::layers::ImageData);
// Find or create an image layer.
let image_layer;
current_layer_child = match current_layer_child {
None => {
debug!("osmain: adding new image layer");
image_layer = @mut layers::layers::ImageLayer(image);
root_layer.add_child(layers::layers::ImageLayerKind(image_layer));
None
}
Some(layers::layers::ImageLayerKind(existing_image_layer)) => {
image_layer = existing_image_layer;
image_layer.set_image(image);
// Move on to the next sibling.
do current_layer_child.get().with_common |common| {
common.next_sibling
}
}
Some(_) => {
fail!(~"found unexpected layer kind")
}
};
// Set the layer's transform.
let x = buffer.rect.origin.x as f32;
let y = buffer.rect.origin.y as f32;
image_layer.common.set_transform(
original_layer_transform.translate(x, y, 0.0)
.scale(width as f32, height as f32, 1.0));
}
surfaces.front.layer_buffer_set.buffers = buffers;
}
Exit => {
*done = true;
}
}
}
};
let adjust_for_window_resizing: @fn() = || {
let window_width = glut::get(glut::WindowWidth) as uint;
let window_height = glut::get(glut::WindowHeight) as uint;
// FIXME: Cross-crate struct mutability is broken.
let size: &mut Size2D<f32>;
unsafe { size = cast::transmute(&scene.size); }
*size = Size2D(window_width as f32, window_height as f32);
};
let composite: @fn() = || {
//#debug("osmain: drawing to screen");
do time::time(~"compositing") {
adjust_for_window_resizing();
layers::rendergl::render_scene(context, scene);
}
glut::swap_buffers();
glut::post_redisplay();
};
match window {
GlutWindow(window) => {
do glut::reshape_func(window) |width, height| {
debug!("osmain: window resized to %d,%d", width as int, height as int);
check_for_messages();
resize_rate_limiter.window_resized(width as uint, height as uint);
//composite();
}
do glut::display_func() {
//debug!("osmain: display func");
check_for_messages();
composite();
}
while !*done {
//#debug("osmain: running GLUT check loop");
glut::check_loop();
}
}
ShareWindow(share_context) => {
loop {
check_for_messages();
do time::time(~"compositing") {
layers::rendergl::render_scene(context, scene);
}
share_context.flush();
}
}
}
}
/**
Implementation to allow the osmain channel to be used as a graphics
compositor for the renderer
*/
impl Compositor for OSMain {
fn begin_drawing(&self, next_dt: comm::Chan<LayerBufferSet>) {
self.chan.send(BeginDrawing(next_dt))
}
fn draw(&self, next_dt: comm::Chan<LayerBufferSet>, draw_me: LayerBufferSet) {
self.chan.send(Draw(next_dt, draw_me))
}
}
struct SurfaceSet {
front: Surface,
back: Surface,
}
fn lend_surface(surfaces: &mut SurfaceSet, receiver: comm::Chan<LayerBufferSet>) {
// We are in a position to lend out the surface?
assert!(surfaces.front.have);
// Ok then take it
let old_layer_buffers = util::replace(&mut surfaces.front.layer_buffer_set.buffers, ~[]);
let new_layer_buffers = do old_layer_buffers.map |layer_buffer| {
let draw_target_ref = &layer_buffer.draw_target;
let layer_buffer = LayerBuffer {
draw_target: draw_target_ref.clone(),
rect: copy layer_buffer.rect,
stride: layer_buffer.stride
};
debug!("osmain: lending surface %?", layer_buffer);
layer_buffer
};
surfaces.front.layer_buffer_set.buffers = old_layer_buffers;
let new_layer_buffer_set = LayerBufferSet { buffers: new_layer_buffers };
receiver.send(new_layer_buffer_set);
// Now we don't have it
surfaces.front.have = false;
// But we (hopefully) have another!
surfaces.front <-> surfaces.back;
// Let's look
assert!(surfaces.front.have);
}
fn return_surface(surfaces: &mut SurfaceSet, layer_buffer_set: LayerBufferSet) {
//#debug("osmain: returning surface %?", layer_buffer_set);
// We have room for a return
assert!(surfaces.front.have);
assert!(!surfaces.back.have);
surfaces.back.layer_buffer_set = layer_buffer_set;
// Now we have it again
surfaces.back.have = true;
}
fn SurfaceSet(backend: BackendType) -> SurfaceSet {
SurfaceSet { front: Surface(backend), back: Surface(backend) }
}
struct Surface {
layer_buffer_set: LayerBufferSet,
have: bool,
}
fn Surface(backend: BackendType) -> Surface {
let layer_buffer = LayerBuffer {
draw_target: DrawTarget::new(backend, Size2D(800i32, 600i32), B8G8R8A8),
rect: Rect(Point2D(0u, 0u), Size2D(800u, 600u)),
stride: 800
};
let layer_buffer_set = LayerBufferSet { buffers: ~[ layer_buffer ] };
Surface { layer_buffer_set: layer_buffer_set, have: true }
}
/// A function for spawning into the platform's main thread
fn on_osmain<T: Owned>(f: ~fn(po: Port<T>)) -> Chan<T> {
let (setup_po, setup_ch) = comm::stream();
do task::task().sched_mode(task::PlatformThread).spawn {
let (po, ch) = comm::stream();
setup_ch.send(ch);
f(po);
}
setup_po.recv()
}
// #[cfg(target_os = "linux")]
mod platform {
pub fn runmain(f: &fn()) {
f()
}
}