ImGui Vulkan Validation Repro for issues #8176

This project is a minimal Vulkan + SDL3 + ImGui setup designed to reproduce and test a Vulkan validation error triggered by the official ImGui docking branch.

Issue #8176.

It demonstrates the behavior difference between:

• 🟢 The official ImGui docking branch
• 🛠️ A fixed ImGui branch (fix/vulkan-validation-error-pipeline-barrier) that addresses the Vulkan validation issue

---

🔧 Requirements

• CMake 3.16+
• A C++17-compatible compiler
• Vulkan SDK installed and VULKAN_SDK environment variable set
• Git (for fetching dependencies)

---

📦 Dependencies

This project uses:

• SDL3 (static)
• Volk
• ImGui or ImGui (Fixed)

All dependencies are fetched automatically using FetchContent.

---

🛠️ Build Instructions

🔁 Option 1: Official ImGui (docking branch)

cmake -DUSE_FIXED_IMGUI=OFF -B build_official -S .

🔁 Option 2: Fixed ImGui (fix/vulkan-validation-error-pipeline-barrier branch)

cmake -DUSE_FIXED_IMGUI=ON -B build_fixed -S .