From d2597482e0233e33c1e09dae927049b53dc528f4 Mon Sep 17 00:00:00 2001
From: Enrico Turri <enricoturri@seznam.cz>
Date: Thu, 25 Apr 2019 11:10:01 +0200
Subject: [PATCH] Added imgui debug dialog for render statistics

---
 src/libslic3r/Technologies.hpp |  2 ++
 src/slic3r/GUI/GLCanvas3D.cpp  | 25 ++++++++++++++++++++++++-
 src/slic3r/GUI/GLCanvas3D.hpp  | 14 +++++++++++++-
 3 files changed, 39 insertions(+), 2 deletions(-)

diff --git a/src/libslic3r/Technologies.hpp b/src/libslic3r/Technologies.hpp
index ea3d87888..afd8ee026 100644
--- a/src/libslic3r/Technologies.hpp
+++ b/src/libslic3r/Technologies.hpp
@@ -11,6 +11,8 @@
 #define ENABLE_SELECTION_DEBUG_OUTPUT 0
 // Renders a small sphere in the center of the bounding box of the current selection when no gizmo is active
 #define ENABLE_RENDER_SELECTION_CENTER 0
+// Shows an imgui dialog with render related data
+#define ENABLE_RENDER_STATISTICS 1
 
 
 //====================
diff --git a/src/slic3r/GUI/GLCanvas3D.cpp b/src/slic3r/GUI/GLCanvas3D.cpp
index 9798efecb..d58b40fdf 100644
--- a/src/slic3r/GUI/GLCanvas3D.cpp
+++ b/src/slic3r/GUI/GLCanvas3D.cpp
@@ -52,6 +52,9 @@
 #include <float.h>
 #include <algorithm>
 #include <cmath>
+#if ENABLE_RENDER_STATISTICS
+#include <chrono>
+#endif // ENABLE_RENDER_STATISTICS
 
 static const float TRACKBALLSIZE = 0.8f;
 static const float GROUND_Z = -0.02f;
@@ -1581,6 +1584,10 @@ void GLCanvas3D::render()
     if (!_set_current() || !_3DScene::init(m_canvas))
         return;
 
+#if ENABLE_RENDER_STATISTICS
+    auto start_time = std::chrono::high_resolution_clock::now();
+#endif // ENABLE_RENDER_STATISTICS
+
     if (m_bed.get_shape().empty())
     {
         // this happens at startup when no data is still saved under <>\AppData\Roaming\Slic3rPE
@@ -1666,9 +1673,26 @@ void GLCanvas3D::render()
     if ((m_layers_editing.last_object_id >= 0) && (m_layers_editing.object_max_z() > 0.0f))
         m_layers_editing.render_overlay(*this);
 
+#if ENABLE_RENDER_STATISTICS
+    ImGuiWrapper& imgui = *wxGetApp().imgui();
+    imgui.set_next_window_bg_alpha(0.5f);
+    imgui.begin(std::string("Render statistics"), ImGuiWindowFlags_NoResize | ImGuiWindowFlags_NoCollapse);
+    imgui.text("Last frame: ");
+    ImGui::SameLine();
+    imgui.text(std::to_string(m_render_stats.last_frame));
+    ImGui::SameLine();
+    imgui.text(" ms");
+    imgui.end();
+#endif // ENABLE_RENDER_STATISTICS
+
     wxGetApp().imgui()->render();
 
     m_canvas->SwapBuffers();
+
+#if ENABLE_RENDER_STATISTICS
+    auto end_time = std::chrono::high_resolution_clock::now();
+    m_render_stats.last_frame = std::chrono::duration_cast<std::chrono::milliseconds>(end_time - start_time).count();
+#endif // ENABLE_RENDER_STATISTICS
 }
 
 void GLCanvas3D::select_all()
@@ -2751,7 +2775,6 @@ void GLCanvas3D::on_mouse(wxMouseEvent& evt)
             m_regenerate_volumes = false;
             m_selection.translate(cur_pos - m_mouse.drag.start_position_3D);
             wxGetApp().obj_manipul()->update_settings_value(m_selection);
-
             m_dirty = true;
         }
     }
diff --git a/src/slic3r/GUI/GLCanvas3D.hpp b/src/slic3r/GUI/GLCanvas3D.hpp
index bae9f0b5e..9e2d87bdb 100644
--- a/src/slic3r/GUI/GLCanvas3D.hpp
+++ b/src/slic3r/GUI/GLCanvas3D.hpp
@@ -319,7 +319,6 @@ class GLCanvas3D
         }
     };
 
-private:
     struct SlaCap
     {
         struct Triangles
@@ -399,6 +398,15 @@ private:
         void render(const GLCanvas3D& canvas) const;
     };
 
+#if ENABLE_RENDER_STATISTICS
+    struct RenderStats
+    {
+        long long last_frame;
+
+        RenderStats() : last_frame(0) {}
+    };
+#endif // ENABLE_RENDER_STATISTICS
+
 public:
     enum ECursorType : unsigned char
     {
@@ -464,6 +472,10 @@ private:
 
     GCodePreviewVolumeIndex m_gcode_preview_volume_index;
 
+#if ENABLE_RENDER_STATISTICS
+    RenderStats m_render_stats;
+#endif // ENABLE_RENDER_STATISTICS
+
 public:
     GLCanvas3D(wxGLCanvas* canvas, Bed3D& bed, Camera& camera, GLToolbar& view_toolbar);
     ~GLCanvas3D();