From 99c0d2d74432613ab7c78b6184e1daf84b113ddb Mon Sep 17 00:00:00 2001
From: Anonymous Maarten <madebr@users.noreply.github.com>
Date: Wed, 11 Jun 2025 01:03:12 +0200
Subject: [PATCH] Enable callgrind for specific scenarios (#276)

---
 CMakeLists.txt     |  8 ++++++++
 ISLE/isledebug.cpp | 21 +++++++++++++++++++++
 2 files changed, 29 insertions(+)

diff --git a/CMakeLists.txt b/CMakeLists.txt
index d3806a1f..0ac7a25f 100644
--- a/CMakeLists.txt
+++ b/CMakeLists.txt
@@ -488,6 +488,14 @@ if (ISLE_BUILD_APP)
     )
     target_compile_definitions(isle PRIVATE ISLE_DEBUG)
     target_link_libraries(isle PRIVATE imgui)
+    find_path(valgrind_INCLUDE_PATH NAMES valgrind/callgrind.h)
+    if(valgrind_INCLUDE_PATH)
+      # Run isle under valgrind to create a profile. Use e.g. kcachegrind to view the profile.
+      # > valgrind --tool=callgrind --dump-instr=yes --simulate-cache=yes --collect-jumps=yes \
+      # >         --collect-atstart=no --instr-atstart=no ./isle --debug
+      target_compile_definitions(isle PRIVATE ISLE_VALGRIND)
+      target_include_directories(isle PRIVATE ${valgrind_INCLUDE_PATH})
+    endif()
   endif()
 endif()
 
diff --git a/ISLE/isledebug.cpp b/ISLE/isledebug.cpp
index a917e9bd..fc451c2d 100644
--- a/ISLE/isledebug.cpp
+++ b/ISLE/isledebug.cpp
@@ -16,6 +16,10 @@
 #include <backends/imgui_impl_sdlrenderer3.h>
 #include <imgui.h>
 
+#ifdef ISLE_VALGRIND
+#include <valgrind/callgrind.h>
+#endif
+
 #define SCANCODE_KEY_PAUSE SDL_SCANCODE_KP_0
 #define SCANCODE_KEY_RESUME SDL_SCANCODE_KP_PERIOD
 
@@ -28,6 +32,10 @@ static SDL_Renderer* g_debugRenderer;
 static SDL_Texture* g_videoPalette;
 static IDirect3DRMMiniwinDevice* g_d3drmMiniwinDevice;
 
+#ifdef ISLE_VALGRIND
+static bool g_instrumentationEnabled;
+#endif
+
 class DebugViewer {
 public:
 	static void InsidePlantManager()
@@ -257,6 +265,19 @@ void IsleDebug_Render()
 				Lego()->Resume();
 			}
 		}
+#ifdef ISLE_VALGRIND
+		if (ImGui::MenuItem(g_instrumentationEnabled ? "Disable instrumentation" : "Enable instrumentation")) {
+			g_instrumentationEnabled = !g_instrumentationEnabled;
+			if (g_instrumentationEnabled) {
+				CALLGRIND_START_INSTRUMENTATION;
+				CALLGRIND_TOGGLE_COLLECT;
+			}
+			else {
+				CALLGRIND_TOGGLE_COLLECT;
+				CALLGRIND_STOP_INSTRUMENTATION;
+			}
+		}
+#endif
 		ImGui::EndMainMenuBar();
 		ImGui::ShowDemoWindow(nullptr);
 		LegoOmni* lego = Lego();