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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::dom::bindings::codegen::Bindings::WebGLRenderingContextBinding::WebGLRenderingContextMethods;
use crate::dom::bindings::codegen::Bindings::XRViewBinding::{XREye, XRViewMethods};
use crate::dom::bindings::codegen::Bindings::XRWebGLLayerBinding;
use crate::dom::bindings::codegen::Bindings::XRWebGLLayerBinding::XRWebGLLayerInit;
use crate::dom::bindings::codegen::Bindings::XRWebGLLayerBinding::XRWebGLLayerMethods;
use crate::dom::bindings::error::Error;
use crate::dom::bindings::error::Fallible;
use crate::dom::bindings::reflector::{reflect_dom_object, DomObject, Reflector};
use crate::dom::bindings::root::{Dom, DomRoot};
use crate::dom::globalscope::GlobalScope;
use crate::dom::webglframebuffer::WebGLFramebuffer;
use crate::dom::webglrenderingcontext::WebGLRenderingContext;
use crate::dom::window::Window;
use crate::dom::xrsession::XRSession;
use crate::dom::xrview::XRView;
use crate::dom::xrviewport::XRViewport;
use canvas_traits::webgl::WebGLFramebufferId;
use dom_struct::dom_struct;
use euclid::Size2D;
use std::convert::TryInto;
use webxr_api::SwapChainId as WebXRSwapChainId;
use webxr_api::{Viewport, Views};
#[dom_struct]
pub struct XRWebGLLayer {
reflector_: Reflector,
antialias: bool,
depth: bool,
stencil: bool,
alpha: bool,
#[ignore_malloc_size_of = "ids don't malloc"]
swap_chain_id: Option<WebXRSwapChainId>,
context: Dom<WebGLRenderingContext>,
session: Dom<XRSession>,
/// If none, this is an inline session (the composition disabled flag is true)
framebuffer: Option<Dom<WebGLFramebuffer>>,
}
impl XRWebGLLayer {
pub fn new_inherited(
swap_chain_id: Option<WebXRSwapChainId>,
session: &XRSession,
context: &WebGLRenderingContext,
init: &XRWebGLLayerInit,
framebuffer: Option<&WebGLFramebuffer>,
) -> XRWebGLLayer {
XRWebGLLayer {
reflector_: Reflector::new(),
antialias: init.antialias,
depth: init.depth,
stencil: init.stencil,
alpha: init.alpha,
swap_chain_id,
context: Dom::from_ref(context),
session: Dom::from_ref(session),
framebuffer: framebuffer.map(Dom::from_ref),
}
}
pub fn new(
global: &GlobalScope,
swap_chain_id: Option<WebXRSwapChainId>,
session: &XRSession,
context: &WebGLRenderingContext,
init: &XRWebGLLayerInit,
framebuffer: Option<&WebGLFramebuffer>,
) -> DomRoot<XRWebGLLayer> {
reflect_dom_object(
Box::new(XRWebGLLayer::new_inherited(
swap_chain_id,
session,
context,
init,
framebuffer,
)),
global,
XRWebGLLayerBinding::Wrap,
)
}
/// https://immersive-web.github.io/webxr/#dom-xrwebgllayer-xrwebgllayer
pub fn Constructor(
global: &Window,
session: &XRSession,
context: &WebGLRenderingContext,
init: &XRWebGLLayerInit,
) -> Fallible<DomRoot<Self>> {
let framebuffer;
// Step 2
if session.is_ended() {
return Err(Error::InvalidState);
}
// XXXManishearth step 3: throw error if context is lost
// XXXManishearth step 4: check XR compat flag for immersive sessions
// Step 9.2. "Initialize layer’s framebuffer to a new opaque framebuffer created with context."
let (swap_chain_id, framebuffer) = if session.is_immersive() {
let size = session.with_session(|session| session.recommended_framebuffer_resolution());
let (swap_chain_id, fb) = WebGLFramebuffer::maybe_new_webxr(session, context, size)
.ok_or(Error::Operation)?;
framebuffer = fb;
(Some(swap_chain_id), Some(&*framebuffer))
} else {
(None, None)
};
// Step 9.3. "Allocate and initialize resources compatible with session’s XR device,
// including GPU accessible memory buffers, as required to support the compositing of layer."
// Step 9.4: "If layer’s resources were unable to be created for any reason,
// throw an OperationError and abort these steps."
// Ensure that we finish setting up this layer before continuing.
context.Finish();
// Step 10. "Return layer."
Ok(XRWebGLLayer::new(
&global.global(),
swap_chain_id,
session,
context,
init,
framebuffer,
))
}
pub fn swap_chain_id(&self) -> WebXRSwapChainId {
self.swap_chain_id
.expect("swap_chain_id must not be called for inline sessions")
}
pub fn session(&self) -> &XRSession {
&self.session
}
pub fn swap_buffers(&self) {
if let WebGLFramebufferId::Opaque(id) = self
.framebuffer
.as_ref()
.expect("swap_buffers must not be called for inline sessions")
.id()
{
self.context.swap_buffers(Some(id));
}
}
pub fn size(&self) -> Size2D<u32, Viewport> {
if let Some(framebuffer) = self.framebuffer.as_ref() {
let size = framebuffer.size().unwrap_or((0, 0));
Size2D::new(
size.0.try_into().unwrap_or(0),
size.1.try_into().unwrap_or(0),
)
} else {
Size2D::from_untyped(self.context.Canvas().get_size())
}
}
}
impl XRWebGLLayerMethods for XRWebGLLayer {
/// https://immersive-web.github.io/webxr/#dom-xrwebgllayer-depth
fn Depth(&self) -> bool {
self.depth
}
/// https://immersive-web.github.io/webxr/#dom-xrwebgllayer-stencil
fn Stencil(&self) -> bool {
self.stencil
}
/// https://immersive-web.github.io/webxr/#dom-xrwebgllayer-antialias
fn Antialias(&self) -> bool {
self.antialias
}
/// https://immersive-web.github.io/webxr/#dom-xrwebgllayer-alpha
fn Alpha(&self) -> bool {
self.alpha
}
/// https://immersive-web.github.io/webxr/#dom-xrwebgllayer-context
fn Context(&self) -> DomRoot<WebGLRenderingContext> {
DomRoot::from_ref(&self.context)
}
/// https://immersive-web.github.io/webxr/#dom-xrwebgllayer-framebuffer
fn GetFramebuffer(&self) -> Option<DomRoot<WebGLFramebuffer>> {
self.framebuffer.as_ref().map(|x| DomRoot::from_ref(&**x))
}
/// https://immersive-web.github.io/webxr/#dom-xrwebgllayer-framebufferwidth
fn FramebufferWidth(&self) -> u32 {
self.size().width
}
/// https://immersive-web.github.io/webxr/#dom-xrwebgllayer-framebufferheight
fn FramebufferHeight(&self) -> u32 {
self.size().height
}
/// https://immersive-web.github.io/webxr/#dom-xrwebgllayer-getviewport
fn GetViewport(&self, view: &XRView) -> Option<DomRoot<XRViewport>> {
if self.session != view.session() {
return None;
}
let views = self.session.with_session(|s| s.views().clone());
let viewport = match (view.Eye(), views) {
(XREye::None, Views::Mono(view)) => view.viewport,
(XREye::Left, Views::Stereo(view, _)) => view.viewport,
(XREye::Right, Views::Stereo(_, view)) => view.viewport,
// The spec doesn't really say what to do in this case
// https://github.com/immersive-web/webxr/issues/769
_ => return None,
};
Some(XRViewport::new(&self.global(), viewport))
}
}
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