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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 https://mozilla.org/MPL/2.0/. */
use crate::webgl_thread::{WebGLThread, WebGLThreadInit, WebXRBridgeInit};
use canvas_traits::webgl::webgl_channel;
use canvas_traits::webgl::{WebGLContextId, WebGLMsg, WebGLThreads};
use euclid::default::Size2D;
use fnv::FnvHashMap;
use gleam;
use servo_config::pref;
use sparkle::gl;
use sparkle::gl::GlType;
use std::default::Default;
use std::rc::Rc;
use std::sync::{Arc, Mutex};
use surfman::Device;
use surfman::SurfaceInfo;
use surfman::SurfaceTexture;
use surfman_chains::SwapChains;
use surfman_chains_api::SwapChainAPI;
use surfman_chains_api::SwapChainsAPI;
use webrender_surfman::WebrenderSurfman;
use webrender_traits::{
WebrenderExternalImageApi, WebrenderExternalImageRegistry, WebrenderImageSource,
};
use webxr::SurfmanGL as WebXRSurfman;
use webxr_api::LayerGrandManager as WebXRLayerGrandManager;
pub struct WebGLComm {
pub webgl_threads: WebGLThreads,
pub image_handler: Box<dyn WebrenderExternalImageApi>,
pub output_handler: Option<Box<dyn webrender_api::OutputImageHandler>>,
pub webxr_layer_grand_manager: WebXRLayerGrandManager<WebXRSurfman>,
}
impl WebGLComm {
/// Creates a new `WebGLComm` object.
pub fn new(
surfman: WebrenderSurfman,
webrender_gl: Rc<dyn gleam::gl::Gl>,
webrender_api_sender: webrender_api::RenderApiSender,
webrender_doc: webrender_api::DocumentId,
external_images: Arc<Mutex<WebrenderExternalImageRegistry>>,
api_type: GlType,
) -> WebGLComm {
debug!("WebGLThreads::new()");
let (sender, receiver) = webgl_channel::<WebGLMsg>().unwrap();
let webrender_swap_chains = SwapChains::new();
let webxr_init = WebXRBridgeInit::new(sender.clone());
let webxr_layer_grand_manager = webxr_init.layer_grand_manager();
// This implementation creates a single `WebGLThread` for all the pipelines.
let init = WebGLThreadInit {
webrender_api_sender,
webrender_doc,
external_images,
sender: sender.clone(),
receiver,
webrender_swap_chains: webrender_swap_chains.clone(),
connection: surfman.connection(),
adapter: surfman.adapter(),
api_type,
webxr_init,
};
let output_handler = if pref!(dom.webgl.dom_to_texture.enabled) {
Some(Box::new(OutputHandler::new(webrender_gl.clone())))
} else {
None
};
let external = WebGLExternalImages::new(surfman, webrender_swap_chains);
WebGLThread::run_on_own_thread(init);
WebGLComm {
webgl_threads: WebGLThreads(sender),
image_handler: Box::new(external),
output_handler: output_handler.map(|b| b as Box<_>),
webxr_layer_grand_manager: webxr_layer_grand_manager,
}
}
}
/// Bridge between the webrender::ExternalImage callbacks and the WebGLThreads.
struct WebGLExternalImages {
surfman: WebrenderSurfman,
swap_chains: SwapChains<WebGLContextId, Device>,
locked_front_buffers: FnvHashMap<WebGLContextId, SurfaceTexture>,
}
impl WebGLExternalImages {
fn new(surfman: WebrenderSurfman, swap_chains: SwapChains<WebGLContextId, Device>) -> Self {
Self {
surfman,
swap_chains,
locked_front_buffers: FnvHashMap::default(),
}
}
fn lock_swap_chain(&mut self, id: WebGLContextId) -> Option<(u32, Size2D<i32>)> {
debug!("... locking chain {:?}", id);
let front_buffer = self.swap_chains.get(id)?.take_surface()?;
let SurfaceInfo {
id: front_buffer_id,
size,
..
} = self.surfman.surface_info(&front_buffer);
debug!("... getting texture for surface {:?}", front_buffer_id);
let front_buffer_texture = self.surfman.create_surface_texture(front_buffer).unwrap();
let gl_texture = self.surfman.surface_texture_object(&front_buffer_texture);
self.locked_front_buffers.insert(id, front_buffer_texture);
Some((gl_texture, size))
}
fn unlock_swap_chain(&mut self, id: WebGLContextId) -> Option<()> {
let locked_front_buffer = self.locked_front_buffers.remove(&id)?;
let locked_front_buffer = self
.surfman
.destroy_surface_texture(locked_front_buffer)
.unwrap();
debug!("... unlocked chain {:?}", id);
self.swap_chains
.get(id)?
.recycle_surface(locked_front_buffer);
Some(())
}
}
impl WebrenderExternalImageApi for WebGLExternalImages {
fn lock(&mut self, id: u64) -> (WebrenderImageSource, Size2D<i32>) {
let id = WebGLContextId(id);
let (texture_id, size) = self.lock_swap_chain(id).unwrap_or_default();
(WebrenderImageSource::TextureHandle(texture_id), size)
}
fn unlock(&mut self, id: u64) {
let id = WebGLContextId(id);
self.unlock_swap_chain(id);
}
}
/// struct used to implement DOMToTexture feature and webrender::OutputImageHandler trait.
struct OutputHandler {
webrender_gl: Rc<dyn gleam::gl::Gl>,
sync_objects: FnvHashMap<webrender_api::PipelineId, gleam::gl::GLsync>,
}
impl OutputHandler {
fn new(webrender_gl: Rc<dyn gleam::gl::Gl>) -> Self {
OutputHandler {
webrender_gl,
sync_objects: Default::default(),
}
}
}
/// Bridge between the WR frame outputs and WebGL to implement DOMToTexture synchronization.
impl webrender_api::OutputImageHandler for OutputHandler {
fn lock(
&mut self,
id: webrender_api::PipelineId,
) -> Option<(u32, webrender_api::units::FramebufferIntSize)> {
// Insert a fence in the WR command queue
let gl_sync = self
.webrender_gl
.fence_sync(gl::SYNC_GPU_COMMANDS_COMPLETE, 0);
self.sync_objects.insert(id, gl_sync);
// https://github.com/servo/servo/issues/24615
None
}
fn unlock(&mut self, id: webrender_api::PipelineId) {
if let Some(gl_sync) = self.sync_objects.remove(&id) {
// Flush the Sync object into the GPU's command queue to guarantee that it it's signaled.
self.webrender_gl.flush();
// Mark the sync object for deletion.
self.webrender_gl.delete_sync(gl_sync);
}
}
}
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