From 7ce8c772adae8802bfc529a7cb5eb7c2854c81cc Mon Sep 17 00:00:00 2001
From: Bartosz Taudul <wolf.pld@gmail.com>
Date: Wed, 30 Oct 2019 22:37:07 +0100
Subject: [PATCH] Disallow negative GPU times.

Shouldn't happen, but GPU timestamps are a shitshow, so better be safe
than sorry.
---
 server/TracyWorker.cpp | 5 +++--
 1 file changed, 3 insertions(+), 2 deletions(-)

diff --git a/server/TracyWorker.cpp b/server/TracyWorker.cpp
index 6411104a..5e88e24a 100644
--- a/server/TracyWorker.cpp
+++ b/server/TracyWorker.cpp
@@ -4297,8 +4297,9 @@ void Worker::ProcessGpuTime( const QueueGpuTime& ev )
     auto ctx = m_gpuCtxMap[ev.context];
     assert( ctx );
 
-    const int64_t t = m_refTimeGpu + ev.gpuTime;
-    m_refTimeGpu = t;
+    const int64_t tref = m_refTimeGpu + ev.gpuTime;
+    m_refTimeGpu = tref;
+    const int64_t t = std::max<int64_t>( 0, tref );
 
     int64_t gpuTime;
     if( ctx->period == 1.f )