GaussianSplatOpenGLContext.h

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// ----------------------------------------------------------------------------
// -                        Open3D: www.open3d.org                            -
// ----------------------------------------------------------------------------
// Copyright (c) 2018-2024 www.open3d.org
// SPDX-License-Identifier: MIT
// ----------------------------------------------------------------------------
 
// GL context management for OpenGL compute-based Gaussian splatting.
// Uses a hidden GLFW window with a GL 4.6 core-profile context and exposes
// the native handle (GLXContext on Linux/X11/XWayland, HGLRC on Windows) so
// Filament can create its own context sharing the same GL object namespace.
//
// Offscreen rendering on Linux now requires an X11 or XWayland server. EGL is
// intentionally not used because Filament's Linux OpenGL path is GLX-only.
 
#pragma once
 
#if !defined(__APPLE__)
 
namespace open3d {
namespace visualization {
namespace rendering {
 
class GaussianSplatOpenGLContext {
public:
    static GaussianSplatOpenGLContext& GetInstance();
 
    bool InitializeStandalone();
 
    bool Initialize();
 
    void* GetNativeContext() const;
 
    void Shutdown();
 
    bool IsValid() const;
 
    bool MakeCurrent();
 
    void ReleaseCurrent();
 
private:
    GaussianSplatOpenGLContext() = default;
    ~GaussianSplatOpenGLContext();
 
    GaussianSplatOpenGLContext(const GaussianSplatOpenGLContext&) = delete;
    GaussianSplatOpenGLContext& operator=(const GaussianSplatOpenGLContext&) =
            delete;
 
private:
    // Stored as void* (== GLFWwindow*) to avoid a GLFW header dependency.
    void* glfw_window_ = nullptr;
 
    bool initialized_ = false;
    bool gl_logged_ = false;
};
 
}  // namespace rendering
}  // namespace visualization
}  // namespace open3d
 
#endif  // !defined(__APPLE__)