EGLOffscreenContext.h

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// ----------------------------------------------------------------------------
// -                        Open3D: www.open3d.org                            -
// ----------------------------------------------------------------------------
// Copyright (c) 2018-2024 www.open3d.org
// SPDX-License-Identifier: MIT
// ----------------------------------------------------------------------------
 
#pragma once
 
// EGL surfaceless/pbuffer offscreen rendering is only used on Linux, where it
// replaces the legacy OSMesa (software) headless path with GPU-accelerated
// rendering that ships in the standard Open3D binary.
#if defined(__linux__)
 
#include <EGL/egl.h>
 
#include <memory>
 
namespace open3d {
namespace visualization {
 
class EGLOffscreenContext {
public:
    static std::unique_ptr<EGLOffscreenContext> Create(int width, int height);
 
    ~EGLOffscreenContext();
    EGLOffscreenContext(const EGLOffscreenContext &) = delete;
    EGLOffscreenContext &operator=(const EGLOffscreenContext &) = delete;
 
    bool MakeCurrent();
 
    void ReleaseCurrent();
 
    bool SwapBuffers();
 
    int GetWidth() const { return width_; }
    int GetHeight() const { return height_; }
 
private:
    EGLOffscreenContext() = default;
    bool Initialize(int width, int height);
 
    EGLDisplay display_ = EGL_NO_DISPLAY;
    EGLContext context_ = EGL_NO_CONTEXT;
    EGLSurface surface_ = EGL_NO_SURFACE;
    int width_ = 0;
    int height_ = 0;
};
 
}  // namespace visualization
}  // namespace open3d
 
#endif  // defined(__linux__)