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openvr: Non-threaded present work

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In the unlikely event you hit 90htz in non-threaded present mode, you will have perfect tracking and latency.
This verifies that there are no other sources of tracking or rendering latency, other then the ones we already know about.
This commit is contained in:
Anthony Thibault 2016-03-22 15:38:10 -07:00
parent 50ac101d56
commit 209524a5c0
3 changed files with 10 additions and 5 deletions
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2
libraries/display-plugins/src/display-plugins/OpenGLDisplayPlugin.h
View file

@ -17,9 +17,9 @@
#include <GLMHelpers.h>
#include <SimpleMovingAverage.h>
#include <gl/OglplusHelpers.h>
#include <gl/GLEscrow.h>
#define THREADED_PRESENT 1
#include <gl/GLEscrow.h>
class OpenGLDisplayPlugin : public DisplayPlugin {
protected:

5
libraries/gl/src/gl/GLEscrow.h
View file

@ -71,11 +71,16 @@ public:
}
bool signaled() const {
#if THREADED_PRESENT
auto result = glClientWaitSync(_sync, 0, 0);
if (GL_TIMEOUT_EXPIRED != result && GL_WAIT_FAILED != result) {
return true;
}
return false;
#else
glWaitSync(_sync, 0, GL_TIMEOUT_IGNORED);
return true;
#endif
}
};

8
plugins/openvr/src/OpenVrDisplayPlugin.cpp
View file

@ -69,6 +69,9 @@ void OpenVrDisplayPlugin::internalActivate() {
_compositor = vr::VRCompositor();
Q_ASSERT(_compositor);
// enable async time warp
// _compositor->ForceInterleavedReprojectionOn(true);
// set up default sensor space such that the UI overlay will align with the front of the room.
auto chaperone = vr::VRChaperone();
if (chaperone) {
@ -123,10 +126,7 @@ void OpenVrDisplayPlugin::updateHeadPose(uint32_t frameIndex) {
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 = 2.0f * frameDuration - timeSinceLastVsync + vsyncToPhotons;
float predictedSecondsFromNow = frameDuration + vsyncToPhotons;
#endif
vr::TrackedDevicePose_t predictedTrackedDevicePose[vr::k_unMaxTrackedDeviceCount];