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Removed frame latency in GLEscrow

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This could occur if the GLEscrow queue has extra frames in it.
When new textures were fetched, before this fix, they were simply popped from the queue.
This commit introduces a loop, that will fetch from the queue until it is empty.
This commit is contained in:
Anthony Thibault 2016-03-21 21:51:16 -07:00
parent 225c462685
commit b1286517c6
2 changed files with 8 additions and 6 deletions
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8
libraries/gl/src/gl/GLEscrow.h
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@ -203,13 +203,15 @@ public:
// Also releases any previous texture held by the caller
bool fetchSignaledAndRelease(T& value) {
T originalValue = value;
if (fetchSignaled(value)) {
bool fetched = false;
while (fetchSignaled(value)) {
fetched = true;
if (originalValue != invalid()) {
release(originalValue);
}
return true;
originalValue = value;
}
return false;
return fetched;
}
bool fetchAndReleaseWithFence(T& value, GLsync& sync) {

6
plugins/openvr/src/OpenVrDisplayPlugin.cpp
View file

@ -119,14 +119,14 @@ void OpenVrDisplayPlugin::updateHeadPose(uint32_t frameIndex) {
float vsyncToPhotons = _system->GetFloatTrackedDeviceProperty(vr::k_unTrackedDeviceIndex_Hmd, vr::Prop_SecondsFromVsyncToPhotons_Float);
#if THREADED_PRESENT
// TODO: this seems awfuly long, 44ms total, but it produced the best results.
const float NUM_PREDICTION_FRAMES = 3.0f;
// 2 frames of prediction + vsyncToPhotons = 33ms total
const float NUM_PREDICTION_FRAMES = 2.0f;
float predictedSecondsFromNow = NUM_PREDICTION_FRAMES * frameDuration + vsyncToPhotons;
#else
uint64_t frameCounter;
float timeSinceLastVsync;
_system->GetTimeSinceLastVsync(&timeSinceLastVsync, &frameCounter);
float predictedSecondsFromNow = 3.0f * frameDuration - timeSinceLastVsync + vsyncToPhotons;
float predictedSecondsFromNow = 2.0f * frameDuration - timeSinceLastVsync + vsyncToPhotons;
#endif
vr::TrackedDevicePose_t predictedTrackedDevicePose[vr::k_unMaxTrackedDeviceCount];