From 2c4879b58c13e8ff27ecaf14a02e16b97803608b Mon Sep 17 00:00:00 2001
From: Philip Rebohle <philip.rebohle@tu-dortmund.de>
Date: Fri, 13 Dec 2019 13:01:16 +0100
Subject: [PATCH] [hud] Reduce update frequency of queue submission display

Shows the maximum number of submissions encountered per frame
in the given time frame.
---
 src/dxvk/hud/dxvk_hud_item.cpp | 13 +++++++++++--
 src/dxvk/hud/dxvk_hud_item.h   |  6 +++++-
 2 files changed, 16 insertions(+), 3 deletions(-)

diff --git a/src/dxvk/hud/dxvk_hud_item.cpp b/src/dxvk/hud/dxvk_hud_item.cpp
index f0c1a21dc..46a2319fc 100644
--- a/src/dxvk/hud/dxvk_hud_item.cpp
+++ b/src/dxvk/hud/dxvk_hud_item.cpp
@@ -290,8 +290,17 @@ namespace dxvk::hud {
     DxvkStatCounters counters = m_device->getStatCounters();
     
     uint32_t currCounter = counters.getCtr(DxvkStatCounter::QueueSubmitCount);
-    m_diffCounter = currCounter - m_prevCounter;
+    m_diffCounter = std::max(m_diffCounter, currCounter - m_prevCounter);
     m_prevCounter = currCounter;
+
+    auto elapsed = std::chrono::duration_cast<std::chrono::microseconds>(time - m_lastUpdate);
+
+    if (elapsed.count() >= UpdateInterval) {
+      m_showCounter = m_diffCounter;
+      m_diffCounter = 0;
+
+      m_lastUpdate = time;
+    }
   }
 
 
@@ -308,7 +317,7 @@ namespace dxvk::hud {
     renderer.drawText(16.0f,
       { position.x + 228.0f, position.y },
       { 1.0f, 1.0f, 1.0f, 1.0f },
-      str::format(m_diffCounter));
+      str::format(m_showCounter));
 
     position.y += 8.0f;
     return position;
diff --git a/src/dxvk/hud/dxvk_hud_item.h b/src/dxvk/hud/dxvk_hud_item.h
index 2bf071eda..e22761964 100644
--- a/src/dxvk/hud/dxvk_hud_item.h
+++ b/src/dxvk/hud/dxvk_hud_item.h
@@ -220,7 +220,7 @@ namespace dxvk::hud {
    * \brief HUD item to display queue submissions
    */
   class HudSubmissionStatsItem : public HudItem {
-
+    constexpr static int64_t UpdateInterval = 500'000;
   public:
 
     HudSubmissionStatsItem(const Rc<DxvkDevice>& device);
@@ -239,6 +239,10 @@ namespace dxvk::hud {
 
     uint64_t        m_prevCounter = 0;
     uint64_t        m_diffCounter = 0;
+    uint64_t        m_showCounter = 0;
+
+    dxvk::high_resolution_clock::time_point m_lastUpdate
+      = dxvk::high_resolution_clock::now();
 
   };