qt-everywhere-src-5.15.1/qtwebengine/src/core/ozone/gl_surface_egl_qt.h

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#ifndef GL_SURFACE_EGL_QT_H_
#define GL_SURFACE_EGL_QT_H_

#include "gl_surface_qt.h"
#include <EGL/egl.h>
#include <EGL/eglext.h>

namespace gl {

class GLSurfaceEGLQt: public GLSurfaceQt {
public:
    explicit GLSurfaceEGLQt(const gfx::Size& size);

    static bool InitializeOneOff();
    static bool InitializeExtensionSettingsOneOff();

    bool Initialize(GLSurfaceFormat format) override;
    void Destroy() override;
    void* GetHandle() override;
    bool Resize(const gfx::Size& size, float scale_factor,
                ColorSpace color_space, bool has_alpha) override;

protected:
    ~GLSurfaceEGLQt();

public:
   static bool g_egl_surfaceless_context_supported;

private:
   EGLSurface m_surfaceBuffer;
   static bool s_initialized;
   DISALLOW_COPY_AND_ASSIGN(GLSurfaceEGLQt);
};

// The following comment is cited from chromium/ui/gl/gl_surface_egl.cc:
// SurfacelessEGL is used as Offscreen surface when platform supports
// KHR_surfaceless_context and GL_OES_surfaceless_context. This would avoid the
// need to create a dummy EGLsurface in case we render to client API targets.

class GLSurfacelessQtEGL : public GLSurfaceQt {
public:
    explicit GLSurfacelessQtEGL(const gfx::Size& size);

public:
    bool Initialize(GLSurfaceFormat format) override;
    void Destroy() override;
    bool IsSurfaceless() const override;
    bool Resize(const gfx::Size& size, float scale_factor,
                ColorSpace color_space, bool has_alpha) override;
    EGLSurface GetHandle() override;
    void* GetShareHandle() override;

private:
    DISALLOW_COPY_AND_ASSIGN(GLSurfacelessQtEGL);
};
}

#endif