From 7f856a1b169853032aa45e481810275b22fb0498 Mon Sep 17 00:00:00 2001
From: Bartosz Taudul <wolf.pld@gmail.com>
Date: Tue, 13 Aug 2019 01:31:04 +0200
Subject: [PATCH] Very bad context switch visualization.

---
 server/TracyView.cpp | 31 +++++++++++++++++++++++++++++++
 server/TracyView.hpp |  1 +
 2 files changed, 32 insertions(+)

diff --git a/server/TracyView.cpp b/server/TracyView.cpp
index 3b083583..0a9ccbb8 100644
--- a/server/TracyView.cpp
+++ b/server/TracyView.cpp
@@ -1882,6 +1882,13 @@ void View::DrawZones()
         offset += ostep;
         if( showFull )
         {
+            auto ctxSwitch = m_worker.GetContextSwitchData( v->id );
+            if( ctxSwitch )
+            {
+                DrawContextSwitches( ctxSwitch, pxns, wpos, offset );
+                offset += ostep;
+            }
+
             if( m_drawZones )
             {
                 depth = DispatchZoneLevel( v->timeline, hover, pxns, int64_t( nspx ), wpos, offset, 0, yMin, yMax );
@@ -2189,6 +2196,30 @@ void View::DrawZones()
     }
 }
 
+void View::DrawContextSwitches( const ContextSwitch* ctx, double pxns, const ImVec2& wpos, int offset )
+{
+    auto& vec = ctx->v;
+    auto it = std::lower_bound( vec.begin(), vec.end(), std::max<int64_t>( 0, m_zvStart ), [] ( const auto& l, const auto& r ) { return (uint64_t)l.end < (uint64_t)r; } );
+    if( it == vec.end() ) return;
+
+    const auto citend = std::lower_bound( it, vec.end(), m_zvEnd, [] ( const auto& l, const auto& r ) { return l.start < r; } );
+    if( it == citend ) return;
+
+    const auto w = ImGui::GetWindowContentRegionWidth() - 1;
+    const auto ty = ImGui::GetFontSize();
+    auto draw = ImGui::GetWindowDrawList();
+
+    while( it < citend )
+    {
+        auto& ev = *it;
+        const auto end = ev.end >= 0 ? ev.end : m_worker.GetLastTime();
+        const auto px0 = std::max( ( ev.start - m_zvStart ) * pxns, -10.0 );
+        const auto px1 = std::min( ( end - m_zvStart ) * pxns, w + 10.0 );
+        draw->AddLine( wpos + ImVec2( px0, round( offset + ty * 0.5 ) ), wpos + ImVec2( px1, round( offset + ty * 0.5 ) ), 0xFF00FF00 );
+        ++it;
+    }
+}
+
 int View::DispatchZoneLevel( const Vector<ZoneEvent*>& vec, bool hover, double pxns, int64_t nspx, const ImVec2& wpos, int _offset, int depth, float yMin, float yMax )
 {
     const auto ty = ImGui::GetFontSize();
diff --git a/server/TracyView.hpp b/server/TracyView.hpp
index 19d56e21..a271e5de 100644
--- a/server/TracyView.hpp
+++ b/server/TracyView.hpp
@@ -108,6 +108,7 @@ private:
     bool DrawZoneFramesHeader();
     bool DrawZoneFrames( const FrameData& frames );
     void DrawZones();
+    void DrawContextSwitches( const ContextSwitch* ctx, double pxns, const ImVec2& wpos, int offset );
     int DispatchZoneLevel( const Vector<ZoneEvent*>& vec, bool hover, double pxns, int64_t nspx, const ImVec2& wpos, int offset, int depth, float yMin, float yMax );
     int DrawZoneLevel( const Vector<ZoneEvent*>& vec, bool hover, double pxns, int64_t nspx, const ImVec2& wpos, int offset, int depth, float yMin, float yMax );
     int SkipZoneLevel( const Vector<ZoneEvent*>& vec, bool hover, double pxns, int64_t nspx, const ImVec2& wpos, int offset, int depth, float yMin, float yMax );