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/* -*- Mode: C++; tab-width: 8; indent-tabs-mode: nil; c-basic-offset: 2 -*- */
/* vim: set ts=8 sts=2 et sw=2 tw=80: */
/* 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/. */
#include "VRDisplayPresentation.h"
#include "mozilla/dom/DocGroup.h"
#include "mozilla/dom/Document.h"
#include "mozilla/dom/XRWebGLLayer.h"
#include "mozilla/Unused.h"
#include "VRDisplayClient.h"
#include "VRLayerChild.h"
using namespace mozilla;
using namespace mozilla::gfx;
VRDisplayPresentation::VRDisplayPresentation(
VRDisplayClient* aDisplayClient,
const nsTArray<mozilla::dom::VRLayer>& aLayers, uint32_t aGroup)
: mDisplayClient(aDisplayClient),
mDOMLayers(aLayers.Clone()),
mGroup(aGroup) {
CreateLayers();
}
void VRDisplayPresentation::UpdateLayers(
const nsTArray<mozilla::dom::VRLayer>& aLayers) {
mDOMLayers = aLayers.Clone();
CreateLayers();
}
void VRDisplayPresentation::UpdateXRWebGLLayer(dom::XRWebGLLayer* aLayer) {
VRManagerChild* manager = VRManagerChild::Get();
if (!manager) {
// This should not happen, but let's log it and avoid a crash in case
// of regression.
NS_WARNING("VRManagerChild::Get returned null!");
return;
}
dom::HTMLCanvasElement* canvasElement = aLayer->GetCanvas();
nsCOMPtr<nsISerialEventTarget> target =
canvasElement->OwnerDoc()->EventTargetFor(TaskCategory::Other);
if (mLayers.Length() == 0) {
// WebXR uses a single layer for now.
RefPtr<VRLayerChild> vrLayer =
static_cast<VRLayerChild*>(manager->CreateVRLayer(
mDisplayClient->GetDisplayInfo().GetDisplayID(), target, mGroup));
mLayers.AppendElement(vrLayer);
}
RefPtr<VRLayerChild> vrLayer = mLayers[0];
Rect leftBounds(0.0, 0.0, 0.5, 1.0);
Rect rightBounds(0.5, 0.0, 0.5, 1.0);
vrLayer->Initialize(canvasElement, leftBounds, rightBounds);
vrLayer->SetXRFramebuffer(aLayer->GetFramebuffer());
}
uint32_t VRDisplayPresentation::GetGroup() const { return mGroup; }
void VRDisplayPresentation::CreateLayers() {
VRManagerChild* manager = VRManagerChild::Get();
if (!manager) {
// This should not happen, but let's log it and avoid a crash in case
// of regression.
NS_WARNING("VRManagerChild::Get returned null!");
return;
}
unsigned int iLayer = 0;
for (dom::VRLayer& layer : mDOMLayers) {
dom::HTMLCanvasElement* canvasElement = layer.mSource;
if (!canvasElement) {
/// XXX In the future we will support WebVR in WebWorkers here
continue;
}
Rect leftBounds(0.0, 0.0, 0.5, 1.0);
if (layer.mLeftBounds.Length() == 4) {
leftBounds.SetRect(layer.mLeftBounds[0], layer.mLeftBounds[1],
layer.mLeftBounds[2], layer.mLeftBounds[3]);
} else if (layer.mLeftBounds.Length() != 0) {
/**
* We ignore layers with an incorrect number of values.
* In the future, VRDisplay.requestPresent may throw in
* this case. See https://github.com/w3c/webvr/issues/71
*/
continue;
}
Rect rightBounds(0.5, 0.0, 0.5, 1.0);
if (layer.mRightBounds.Length() == 4) {
rightBounds.SetRect(layer.mRightBounds[0], layer.mRightBounds[1],
layer.mRightBounds[2], layer.mRightBounds[3]);
} else if (layer.mRightBounds.Length() != 0) {
/**
* We ignore layers with an incorrect number of values.
* In the future, VRDisplay.requestPresent may throw in
* this case. See https://github.com/w3c/webvr/issues/71
*/
continue;
}
nsCOMPtr<nsISerialEventTarget> target =
canvasElement->OwnerDoc()->EventTargetFor(TaskCategory::Other);
if (mLayers.Length() <= iLayer) {
// Not enough layers, let's add one
RefPtr<VRLayerChild> vrLayer =
static_cast<VRLayerChild*>(manager->CreateVRLayer(
mDisplayClient->GetDisplayInfo().GetDisplayID(), target, mGroup));
if (!vrLayer) {
NS_WARNING("CreateVRLayer returned null!");
continue;
}
vrLayer->Initialize(canvasElement, leftBounds, rightBounds);
mLayers.AppendElement(vrLayer);
} else {
// We already have a layer, let's update it
mLayers[iLayer]->Initialize(canvasElement, leftBounds, rightBounds);
}
iLayer++;
}
// Truncate any excess layers that weren't included in the updated list
mLayers.SetLength(iLayer);
}
void VRDisplayPresentation::DestroyLayers() {
for (VRLayerChild* layer : mLayers) {
if (layer->IsIPCOpen()) {
Unused << layer->SendDestroy();
}
}
mLayers.Clear();
}
void VRDisplayPresentation::GetDOMLayers(nsTArray<dom::VRLayer>& result) {
result = mDOMLayers.Clone();
}
VRDisplayPresentation::~VRDisplayPresentation() {
DestroyLayers();
mDisplayClient->PresentationDestroyed();
}
void VRDisplayPresentation::SubmitFrame() {
for (VRLayerChild* layer : mLayers) {
layer->SubmitFrame(mDisplayClient->GetDisplayInfo());
break; // Currently only one layer supported, submit only the first
}
}
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