text: //========================================================================
  // GLFW 3.4 EGL - www.glfw.org
  //------------------------------------------------------------------------
  // Copyright (c) 2002-2006 Marcus Geelnard
  // Copyright (c) 2006-2017 Camilla Löwy <elmindreda@glfw.org>
  //
  // This software is provided 'as-is', without any express or implied
  // warranty. In no event will the authors be held liable for any damages
  // arising from the use of this software.
  //
  // Permission is granted to anyone to use this software for any purpose,
  // including commercial applications, and to alter it and redistribute it
  // freely, subject to the following restrictions:
  //
  // 1. The origin of this software must not be misrepresented; you must not
  //    claim that you wrote the original software. If you use this software
  //    in a product, an acknowledgment in the product documentation would
  //    be appreciated but is not required.
  //
  // 2. Altered source versions must be plainly marked as such, and must not
  //    be misrepresented as being the original software.
  //
  // 3. This notice may not be removed or altered from any source
  //    distribution.
  //
  //========================================================================
  
  #if defined(_GLFW_WIN32)
   #define EGLAPIENTRY __stdcall
  #else
   #define EGLAPIENTRY
  #endif
  
  #define EGL_SUCCESS 0x3000
  #define EGL_NOT_INITIALIZED 0x3001
  #define EGL_BAD_ACCESS 0x3002
  #define EGL_BAD_ALLOC 0x3003
  #define EGL_BAD_ATTRIBUTE 0x3004
  #define EGL_BAD_CONFIG 0x3005
  #define EGL_BAD_CONTEXT 0x3006
  #define EGL_BAD_CURRENT_SURFACE 0x3007
  #define EGL_BAD_DISPLAY 0x3008
  #define EGL_BAD_MATCH 0x3009
  #define EGL_BAD_NATIVE_PIXMAP 0x300a
  #define EGL_BAD_NATIVE_WINDOW 0x300b
  #define EGL_BAD_PARAMETER 0x300c
  #define EGL_BAD_SURFACE 0x300d
  #define EGL_CONTEXT_LOST 0x300e
  #define EGL_COLOR_BUFFER_TYPE 0x303f
  #define EGL_RGB_BUFFER 0x308e
  #define EGL_SURFACE_TYPE 0x3033
  #define EGL_WINDOW_BIT 0x0004
  #define EGL_RENDERABLE_TYPE 0x3040
  #define EGL_OPENGL_ES_BIT 0x0001
  #define EGL_OPENGL_ES2_BIT 0x0004
  #define EGL_OPENGL_BIT 0x0008
  #define EGL_ALPHA_SIZE 0x3021
  #define EGL_BLUE_SIZE 0x3022
  #define EGL_GREEN_SIZE 0x3023
  #define EGL_RED_SIZE 0x3024
  #define EGL_DEPTH_SIZE 0x3025
  #define EGL_STENCIL_SIZE 0x3026
  #define EGL_SAMPLES 0x3031
  #define EGL_OPENGL_ES_API 0x30a0
  #define EGL_OPENGL_API 0x30a2
  #define EGL_NONE 0x3038
  #define EGL_RENDER_BUFFER 0x3086
  #define EGL_SINGLE_BUFFER 0x3085
  #define EGL_EXTENSIONS 0x3055
  #define EGL_CONTEXT_CLIENT_VERSION 0x3098
  #define EGL_NATIVE_VISUAL_ID 0x302e
  #define EGL_NO_SURFACE ((EGLSurface) 0)
  #define EGL_NO_DISPLAY ((EGLDisplay) 0)
  #define EGL_NO_CONTEXT ((EGLContext) 0)
  #define EGL_DEFAULT_DISPLAY ((EGLNativeDisplayType) 0)
  
  #define EGL_CONTEXT_OPENGL_FORWARD_COMPATIBLE_BIT_KHR 0x00000002
  #define EGL_CONTEXT_OPENGL_CORE_PROFILE_BIT_KHR 0x00000001
  #define EGL_CONTEXT_OPENGL_COMPATIBILITY_PROFILE_BIT_KHR 0x00000002
  #define EGL_CONTEXT_OPENGL_DEBUG_BIT_KHR 0x00000001
  #define EGL_CONTEXT_OPENGL_RESET_NOTIFICATION_STRATEGY_KHR 0x31bd
  #define EGL_NO_RESET_NOTIFICATION_KHR 0x31be
  #define EGL_LOSE_CONTEXT_ON_RESET_KHR 0x31bf
  #define EGL_CONTEXT_OPENGL_ROBUST_ACCESS_BIT_KHR 0x00000004
  #define EGL_CONTEXT_MAJOR_VERSION_KHR 0x3098
  #define EGL_CONTEXT_MINOR_VERSION_KHR 0x30fb
  #define EGL_CONTEXT_OPENGL_PROFILE_MASK_KHR 0x30fd
  #define EGL_CONTEXT_FLAGS_KHR 0x30fc
  #define EGL_CONTEXT_OPENGL_NO_ERROR_KHR 0x31b3
  #define EGL_GL_COLORSPACE_KHR 0x309d
  #define EGL_GL_COLORSPACE_SRGB_KHR 0x3089
  #define EGL_CONTEXT_RELEASE_BEHAVIOR_KHR 0x2097
  #define EGL_CONTEXT_RELEASE_BEHAVIOR_NONE_KHR 0
  #define EGL_CONTEXT_RELEASE_BEHAVIOR_FLUSH_KHR 0x2098
  #define EGL_PLATFORM_X11_EXT 0x31d5
  #define EGL_PLATFORM_WAYLAND_EXT 0x31d8
  #define EGL_PLATFORM_ANGLE_ANGLE 0x3202
  #define EGL_PLATFORM_ANGLE_TYPE_ANGLE 0x3203
  #define EGL_PLATFORM_ANGLE_TYPE_OPENGL_ANGLE 0x320d
  #define EGL_PLATFORM_ANGLE_TYPE_OPENGLES_ANGLE 0x320e
  #define EGL_PLATFORM_ANGLE_TYPE_D3D9_ANGLE 0x3207
  #define EGL_PLATFORM_ANGLE_TYPE_D3D11_ANGLE 0x3208
  #define EGL_PLATFORM_ANGLE_TYPE_VULKAN_ANGLE 0x3450
  #define EGL_PLATFORM_ANGLE_TYPE_METAL_ANGLE 0x3489
  #define EGL_PLATFORM_ANGLE_NATIVE_PLATFORM_TYPE_ANGLE 0x348f
  
  typedef int EGLint;
  typedef unsigned int EGLBoolean;
  typedef unsigned int EGLenum;
  typedef void* EGLConfig;
  typedef void* EGLContext;
  typedef void* EGLDisplay;
  typedef void* EGLSurface;
  
  typedef void* EGLNativeDisplayType;
  typedef void* EGLNativeWindowType;
  
  // EGL function pointer typedefs
  typedef EGLBoolean (EGLAPIENTRY * PFN_eglGetConfigAttrib)(EGLDisplay,EGLConfig,EGLint,EGLint*);
  typedef EGLBoolean (EGLAPIENTRY * PFN_eglGetConfigs)(EGLDisplay,EGLConfig*,EGLint,EGLint*);
  typedef EGLDisplay (EGLAPIENTRY * PFN_eglGetDisplay)(EGLNativeDisplayType);
  typedef EGLint (EGLAPIENTRY * PFN_eglGetError)(void);
  typedef EGLBoolean (EGLAPIENTRY * PFN_eglInitialize)(EGLDisplay,EGLint*,EGLint*);
  typedef EGLBoolean (EGLAPIENTRY * PFN_eglTerminate)(EGLDisplay);
  typedef EGLBoolean (EGLAPIENTRY * PFN_eglBindAPI)(EGLenum);
  typedef EGLContext (EGLAPIENTRY * PFN_eglCreateContext)(EGLDisplay,EGLConfig,EGLContext,const EGLint*);
  typedef EGLBoolean (EGLAPIENTRY * PFN_eglDestroySurface)(EGLDisplay,EGLSurface);
  typedef EGLBoolean (EGLAPIENTRY * PFN_eglDestroyContext)(EGLDisplay,EGLContext);
  typedef EGLSurface (EGLAPIENTRY * PFN_eglCreateWindowSurface)(EGLDisplay,EGLConfig,EGLNativeWindowType,const EGLint*);
  typedef EGLBoolean (EGLAPIENTRY * PFN_eglMakeCurrent)(EGLDisplay,EGLSurface,EGLSurface,EGLContext);
  typedef EGLBoolean (EGLAPIENTRY * PFN_eglSwapBuffers)(EGLDisplay,EGLSurface);
  typedef EGLBoolean (EGLAPIENTRY * PFN_eglSwapInterval)(EGLDisplay,EGLint);
  typedef const char* (EGLAPIENTRY * PFN_eglQueryString)(EGLDisplay,EGLint);
  typedef GLFWglproc (EGLAPIENTRY * PFN_eglGetProcAddress)(const char*);
  #define eglGetConfigAttrib _glfw.egl.GetConfigAttrib
  #define eglGetConfigs _glfw.egl.GetConfigs
  #define eglGetDisplay _glfw.egl.GetDisplay
  #define eglGetError _glfw.egl.GetError
  #define eglInitialize _glfw.egl.Initialize
  #define eglTerminate _glfw.egl.Terminate
  #define eglBindAPI _glfw.egl.BindAPI
  #define eglCreateContext _glfw.egl.CreateContext
  #define eglDestroySurface _glfw.egl.DestroySurface
  #define eglDestroyContext _glfw.egl.DestroyContext
  #define eglCreateWindowSurface _glfw.egl.CreateWindowSurface
  #define eglMakeCurrent _glfw.egl.MakeCurrent
  #define eglSwapBuffers _glfw.egl.SwapBuffers
  #define eglSwapInterval _glfw.egl.SwapInterval
  #define eglQueryString _glfw.egl.QueryString
  #define eglGetProcAddress _glfw.egl.GetProcAddress
  
  typedef EGLDisplay (EGLAPIENTRY * PFNEGLGETPLATFORMDISPLAYEXTPROC)(EGLenum,void*,const EGLint*);
  typedef EGLSurface (EGLAPIENTRY * PFNEGLCREATEPLATFORMWINDOWSURFACEEXTPROC)(EGLDisplay,EGLConfig,void*,const EGLint*);
  #define eglGetPlatformDisplayEXT _glfw.egl.GetPlatformDisplayEXT
  #define eglCreatePlatformWindowSurfaceEXT _glfw.egl.CreatePlatformWindowSurfaceEXT
  
  // EGL-specific per-context data
  //
  typedef struct _GLFWcontextEGL
  {
     EGLConfig        config;
     EGLContext       handle;
     EGLSurface       surface;
  
     void*            client;
  
  } _GLFWcontextEGL;
  
  // EGL-specific global data
  //
  typedef struct _GLFWlibraryEGL
  {
      EGLenum         platform;
      EGLDisplay      display;
      EGLint          major, minor;
      GLFWbool        prefix;
  
      GLFWbool        KHR_create_context;
      GLFWbool        KHR_create_context_no_error;
      GLFWbool        KHR_gl_colorspace;
      GLFWbool        KHR_get_all_proc_addresses;
      GLFWbool        KHR_context_flush_control;
      GLFWbool        EXT_client_extensions;
      GLFWbool        EXT_platform_base;
      GLFWbool        EXT_platform_x11;
      GLFWbool        EXT_platform_wayland;
      GLFWbool        ANGLE_platform_angle;
      GLFWbool        ANGLE_platform_angle_opengl;
      GLFWbool        ANGLE_platform_angle_d3d;
      GLFWbool        ANGLE_platform_angle_vulkan;
      GLFWbool        ANGLE_platform_angle_metal;
  
      void*           handle;
  
      PFN_eglGetConfigAttrib      GetConfigAttrib;
      PFN_eglGetConfigs           GetConfigs;
      PFN_eglGetDisplay           GetDisplay;
      PFN_eglGetError             GetError;
      PFN_eglInitialize           Initialize;
      PFN_eglTerminate            Terminate;
      PFN_eglBindAPI              BindAPI;
      PFN_eglCreateContext        CreateContext;
      PFN_eglDestroySurface       DestroySurface;
      PFN_eglDestroyContext       DestroyContext;
      PFN_eglCreateWindowSurface  CreateWindowSurface;
      PFN_eglMakeCurrent          MakeCurrent;
      PFN_eglSwapBuffers          SwapBuffers;
      PFN_eglSwapInterval         SwapInterval;
      PFN_eglQueryString          QueryString;
      PFN_eglGetProcAddress       GetProcAddress;
  
      PFNEGLGETPLATFORMDISPLAYEXTPROC GetPlatformDisplayEXT;
      PFNEGLCREATEPLATFORMWINDOWSURFACEEXTPROC CreatePlatformWindowSurfaceEXT;
  
  } _GLFWlibraryEGL;
  
  
  GLFWbool _glfwInitEGL(void);
  void _glfwTerminateEGL(void);
  GLFWbool _glfwCreateContextEGL(_GLFWwindow* window,
                                 const _GLFWctxconfig* ctxconfig,
                                 const _GLFWfbconfig* fbconfig);
  #if defined(_GLFW_X11)
  GLFWbool _glfwChooseVisualEGL(const _GLFWwndconfig* wndconfig,
                                const _GLFWctxconfig* ctxconfig,
                                const _GLFWfbconfig* fbconfig,
                                Visual** visual, int* depth);
  #endif /*_GLFW_X11*/
  
  