OpenGL Learning Project

Small C++ / OpenGL rendering engine with a decoupled ImGui editor.

Layout

OpenGL/
  Engine/                 Core only (NO ImGui)
  Editor/                 ImGui editor
  Sandbox/src/main.cpp
  Assets/
  Dependencies/           ALL third-party libs (single source)
    include/              GLM, GLFW headers, glad, nlohmann/json, stb
    lib/                  glfw3.lib (Windows)
    imgui/                Dear ImGui + ImGuizmo
    JoltPhysics/          Jolt Physics sources
CMakeLists.txt            Only build entry

Build (only path)

cmake -B build
cmake --build build --config Release

Visual Studio: open the generated build/OpenGL.sln, set startup project OpenGLApp, build/run.

./build/Release/OpenGLApp.exe

There is no separate hand-made .sln under OpenGL/ — CMake is the only solution.

Linux packages (example)

sudo apt install build-essential cmake libgl1-mesa-dev libglfw3-dev libx11-dev libxrandr-dev libxi-dev libxcursor-dev libxinerama-dev

Editor usage

• RMB + WASD / Space / Shift — fly camera
• Alt + LMB — orbit around pivot
• Alt + MMB (or Alt + Shift + LMB) — pan
• Alt + RMB / mouse wheel — zoom (dolly)
• F — focus selected entity
• LMB — select mesh/light; drag gizmo to move
• Project — browse Assets/ tree; Refresh; Create Folder / Create Scene
• Drag model from Project → Hierarchy — creates entity with Material texture slots
• Drag texture from Project → Inspector map slots
• File → New / Save / Save As / Open Scene
• Hierarchy — Add Cube / Physics Cube / Light / Delete
• Inspector — transform, material, lights, rigid body + collider
• Physics → Simulate — run Jolt simulation
• Performance overlay (top-left) — FPS, frame time, counts

Architecture

Editor (ImGui)     →  Scene (ECS) + PhysicsSystem
PhysicsSystem      →  IPhysicsWorld
JoltPhysicsWorld   →  only place that includes Jolt
SceneRenderer      →  Scene + AssetManager
SceneSerializer    →  JSON ↔ Scene

Engine never includes ImGui. Renderer/Scene do not include Jolt.