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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 "VRLayerChild.h"
#include "mozilla/dom/HTMLCanvasElement.h"
#include "mozilla/layers/ImageBridgeChild.h"
#include "mozilla/layers/LayersMessages.h" // for TimedTexture
#include "mozilla/layers/SyncObject.h" // for SyncObjectClient
#include "mozilla/StaticPrefs_dom.h"
#include "mozilla/StaticPrefs_webgl.h"
#include "ClientWebGLContext.h"
#include "gfxPlatform.h"
#include "GLContext.h"
#include "GLScreenBuffer.h"
#include "SharedSurface.h" // for SharedSurface
#include "SharedSurfaceGL.h" // for SharedSurface
namespace mozilla::gfx {
VRLayerChild::VRLayerChild() { MOZ_COUNT_CTOR(VRLayerChild); }
VRLayerChild::~VRLayerChild() {
ClearSurfaces();
MOZ_COUNT_DTOR(VRLayerChild);
}
void VRLayerChild::Initialize(dom::HTMLCanvasElement* aCanvasElement,
const gfx::Rect& aLeftEyeRect,
const gfx::Rect& aRightEyeRect) {
MOZ_ASSERT(aCanvasElement);
mLeftEyeRect = aLeftEyeRect;
mRightEyeRect = aRightEyeRect;
mCanvasElement = aCanvasElement;
}
void VRLayerChild::SetXRFramebuffer(WebGLFramebufferJS* fb) {
mFramebuffer = fb;
}
static constexpr bool kIsAndroid =
#if defined(MOZ_WIDGET_ANDROID)
true;
#else
false;
#endif
void VRLayerChild::SubmitFrame(const VRDisplayInfo& aDisplayInfo) {
uint64_t frameId = aDisplayInfo.GetFrameId();
// aFrameId will not increment unless the previuosly submitted
// frame was received by the VR thread and submitted to the VR
// compositor. We early-exit here in the event that SubmitFrame
// was called twice for the same aFrameId.
if (!mCanvasElement || frameId == mLastSubmittedFrameId) {
return;
}
const auto& webgl = mCanvasElement->GetWebGLContext();
if (!webgl) return;
// Keep the SharedSurfaceTextureClient alive long enough for
// 1 extra frame, accomodating overlapped asynchronous rendering.
mLastFrameTextureDesc = mThisFrameTextureDesc;
bool getNewFrame = true;
if (kIsAndroid) {
/**
* Do not blit WebGL to a SurfaceTexture until the last submitted frame is
* already processed and the new frame poses are ready. SurfaceTextures need
* to be released in the VR render thread in order to allow to be used again
* in the WebGLContext GLScreenBuffer producer. Not doing so causes some
* freezes, crashes or other undefined behaviour.
*/
getNewFrame = (!mThisFrameTextureDesc ||
aDisplayInfo.mDisplayState.lastSubmittedFrameId ==
mLastSubmittedFrameId);
}
if (getNewFrame) {
const RefPtr<layers::ImageBridgeChild> imageBridge =
layers::ImageBridgeChild::GetSingleton();
auto texType = layers::TextureType::Unknown;
if (imageBridge) {
texType = layers::PreferredCanvasTextureType(imageBridge);
}
if (kIsAndroid && StaticPrefs::webgl_enable_surface_texture()) {
texType = layers::TextureType::AndroidNativeWindow;
}
webgl->Present(mFramebuffer, texType, true);
mThisFrameTextureDesc = webgl->GetFrontBuffer(mFramebuffer, true);
}
mLastSubmittedFrameId = frameId;
if (!mThisFrameTextureDesc) {
gfxCriticalError() << "ToSurfaceDescriptor failed in "
"VRLayerChild::SubmitFrame";
return;
}
SendSubmitFrame(*mThisFrameTextureDesc, frameId, mLeftEyeRect, mRightEyeRect);
}
bool VRLayerChild::IsIPCOpen() { return mIPCOpen; }
void VRLayerChild::ClearSurfaces() {
mThisFrameTextureDesc = Nothing();
mLastFrameTextureDesc = Nothing();
const auto& webgl = mCanvasElement->GetWebGLContext();
if (!mFramebuffer && webgl) {
webgl->ClearVRSwapChain();
}
}
void VRLayerChild::ActorDestroy(ActorDestroyReason aWhy) { mIPCOpen = false; }
// static
PVRLayerChild* VRLayerChild::CreateIPDLActor() {
if (!StaticPrefs::dom_vr_enabled() && !StaticPrefs::dom_vr_webxr_enabled()) {
return nullptr;
}
VRLayerChild* c = new VRLayerChild();
c->AddIPDLReference();
return c;
}
// static
bool VRLayerChild::DestroyIPDLActor(PVRLayerChild* actor) {
static_cast<VRLayerChild*>(actor)->ReleaseIPDLReference();
return true;
}
void VRLayerChild::AddIPDLReference() {
MOZ_ASSERT(mIPCOpen == false);
mIPCOpen = true;
AddRef();
}
void VRLayerChild::ReleaseIPDLReference() {
MOZ_ASSERT(mIPCOpen == false);
Release();
}
} // namespace mozilla::gfx
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