void
VRDisplayHost::SubmitFrame(VRLayerParent* aLayer, const int32_t& aInputFrameID,
PTextureParent* aTexture, const gfx::Rect& aLeftEyeRect,
const gfx::Rect& aRightEyeRect)
{
// aInputFrameID is no longer controlled by content with the WebVR 1.1 API
// update; however, we will later use this code to enable asynchronous
// submission of multiple layers to be composited. This will enable
// us to build browser UX that remains responsive even when content does
// not consistently submit frames.
int32_t inputFrameID = aInputFrameID;
if (inputFrameID == 0) {
inputFrameID = mInputFrameID;
}
if (inputFrameID < 0) {
// Sanity check to prevent invalid memory access on builds with assertions
// disabled.
inputFrameID = 0;
}
VRHMDSensorState sensorState = mLastSensorState[inputFrameID % kMaxLatencyFrames];
// It is possible to get a cache miss on mLastSensorState if latency is
// longer than kMaxLatencyFrames. An optimization would be to find a frame
// that is closer than the one selected with the modulus.
// If we hit this; however, latency is already so high that the site is
// un-viewable and a more accurate pose prediction is not likely to
// compensate.
TextureHost* th = TextureHost::AsTextureHost(aTexture);
// WebVR doesn't use the compositor to compose the frame, so use
// AutoLockTextureHostWithoutCompositor here.
AutoLockTextureHostWithoutCompositor autoLock(th);
if (autoLock.Failed()) {
NS_WARNING("Failed to lock the VR layer texture");
return;
}
CompositableTextureSourceRef source;
if (!th->BindTextureSource(source)) {
NS_WARNING("The TextureHost was successfully locked but can't provide a TextureSource");
return;
}
MOZ_ASSERT(source);
IntSize texSize = source->GetSize();
TextureSourceD3D11* sourceD3D11 = source->AsSourceD3D11();
if (!sourceD3D11) {
NS_WARNING("WebVR support currently only implemented for D3D11");
return;
}
SubmitFrame(sourceD3D11, texSize, sensorState, aLeftEyeRect, aRightEyeRect);
}
void
VRDisplayHost::SubmitFrame(VRLayerParent* aLayer, PTextureParent* aTexture,
const gfx::Rect& aLeftEyeRect,
const gfx::Rect& aRightEyeRect)
{
if ((mDisplayInfo.mGroupMask & aLayer->GetGroup()) == 0) {
// Suppress layers hidden by the group mask
return;
}
TextureHost* th = TextureHost::AsTextureHost(aTexture);
// WebVR doesn't use the compositor to compose the frame, so use
// AutoLockTextureHostWithoutCompositor here.
AutoLockTextureHostWithoutCompositor autoLock(th);
if (autoLock.Failed()) {
NS_WARNING("Failed to lock the VR layer texture");
return;
}
CompositableTextureSourceRef source;
if (!th->BindTextureSource(source)) {
NS_WARNING("The TextureHost was successfully locked but can't provide a TextureSource");
return;
}
MOZ_ASSERT(source);
IntSize texSize = source->GetSize();
TextureSourceD3D11* sourceD3D11 = source->AsSourceD3D11();
if (!sourceD3D11) {
NS_WARNING("WebVR support currently only implemented for D3D11");
return;
}
if (!SubmitFrame(sourceD3D11, texSize, aLeftEyeRect, aRightEyeRect)) {
return;
}
/**
* Trigger the next VSync immediately after we are successfully
* submitting frames. As SubmitFrame is responsible for throttling
* the render loop, if we don't successfully call it, we shouldn't trigger
* NotifyVRVsync immediately, as it will run unbounded.
* If NotifyVRVsync is not called here due to SubmitFrame failing, the
* fallback "watchdog" code in VRDisplayHost::NotifyVSync() will cause
* frames to continue at a lower refresh rate until frame submission
* succeeds again.
*/
VRManager *vm = VRManager::Get();
MOZ_ASSERT(vm);
vm->NotifyVRVsync(mDisplayInfo.mDisplayID);
}