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flush openvr fence before looking for it

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This commit is contained in:
Zach Pomerantz 2016-08-18 18:40:53 -07:00
parent a9fbc4ec2c
commit a67c5221e3
1 changed files with 17 additions and 2 deletions
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19
plugins/openvr/src/OpenVrDisplayPlugin.cpp
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@ -111,12 +111,17 @@ public:
_plugin.withNonPresentThreadLock([&] {
while (!_queue.empty()) {
auto& front = _queue.front();
auto result = glClientWaitSync(front.fence, 0, 0);
if (GL_TIMEOUT_EXPIRED == result && GL_WAIT_FAILED == result) {
if (GL_TIMEOUT_EXPIRED == result || GL_WAIT_FAILED == result) {
break;
} else if (GL_CONDITION_SATISFIED == result || GL_CONDITION_SATISFIED == result) {
glDeleteSync(front.fence);
} else {
assert(false);
}
glDeleteSync(front.fence);
front.fence = 0;
_current = front;
_queue.pop();
@ -455,6 +460,16 @@ void OpenVrDisplayPlugin::compositeLayers() {
#if OPENVR_THREADED_SUBMIT
newComposite.fence = glFenceSync(GL_SYNC_GPU_COMMANDS_COMPLETE, 0);
// https://www.opengl.org/registry/specs/ARB/sync.txt:
// > The simple flushing behavior defined by
// > SYNC_FLUSH_COMMANDS_BIT will not help when waiting for a fence
// > command issued in another context's command stream to complete.
// > Applications which block on a fence sync object must take
// > additional steps to assure that the context from which the
// > corresponding fence command was issued has flushed that command
// > to the graphics pipeline.
glFlush();
if (!newComposite.textureID) {
newComposite.textureID = getGLBackend()->getTextureID(newComposite.texture, false);
}