From de4ee288f54ba7878040efbd146257507758910d Mon Sep 17 00:00:00 2001
From: Mitchell Hashimoto <m@mitchellh.com>
Date: Thu, 26 Feb 2026 06:56:16 -0800
Subject: [PATCH] pkg/dcimgui: only add the OpenGL3 shutdown helper if backend
 enabled

---
 pkg/dcimgui/build.zig | 3 +++
 pkg/dcimgui/ext.cpp   | 6 ++++--
 2 files changed, 7 insertions(+), 2 deletions(-)

diff --git a/pkg/dcimgui/build.zig b/pkg/dcimgui/build.zig
index ae907dac0..2a1389834 100644
--- a/pkg/dcimgui/build.zig
+++ b/pkg/dcimgui/build.zig
@@ -56,6 +56,9 @@ pub fn build(b: *std.Build) !void {
     if (freetype) try flags.appendSlice(b.allocator, &.{
         "-DIMGUI_ENABLE_FREETYPE=1",
     });
+    if (backend_opengl3) try flags.appendSlice(b.allocator, &.{
+        "-DZIGPKG_IMGUI_ENABLE_OPENGL3=1",
+    });
     if (target.result.os.tag == .windows) {
         try flags.appendSlice(b.allocator, &.{
             "-DIMGUI_IMPL_API=extern\t\"C\"\t__declspec(dllexport)",
diff --git a/pkg/dcimgui/ext.cpp b/pkg/dcimgui/ext.cpp
index a502c438e..b686c07f4 100644
--- a/pkg/dcimgui/ext.cpp
+++ b/pkg/dcimgui/ext.cpp
@@ -37,6 +37,7 @@ CIMGUI_API void ImGuiStyle_ImGuiStyle(cimgui::ImGuiStyle* self)
 // next Init to reload the GL function pointers via imgl3wInit().
 #ifndef IMGUI_DISABLE
 #if __has_include("backends/imgui_impl_opengl3.h")
+#ifdef ZIGPKG_IMGUI_ENABLE_OPENGL3
 #include "backends/imgui_impl_opengl3.h"
 #include "backends/imgui_impl_opengl3_loader.h"
 
@@ -45,7 +46,8 @@ CIMGUI_API void ImGui_ImplOpenGL3_ShutdownWithLoaderCleanup()
     ::ImGui_ImplOpenGL3_Shutdown();
     memset(&imgl3wProcs, 0, sizeof(imgl3wProcs));
 }
-#endif
-#endif
+#endif // ZIGPKG_IMGUI_ENABLE_OPENGL3
+#endif // __has_include("backends/imgui_impl_opengl3.h")
+#endif // IMGUI_DISABLE
 
 }