    #ifndef __wglext_h_
    #define __wglext_h_

    #ifdef __cplusplus
    extern "C" {
    #endif

    /*
    ** License Applicability. Except to the extent portions of this file are
    ** made subject to an alternative license as permitted in the SGI Free
    ** Software License B, Version 1.1 (the "License"), the contents of this
    ** file are subject only to the provisions of the License. You may not use
    ** this file except in compliance with the License. You may obtain a copy
    ** of the License at Silicon Graphics, Inc., attn: Legal Services, 1600
    ** Amphitheatre Parkway, Mountain View, CA 94043-1351, or at:
    **
    ** http://oss.sgi.com/projects/FreeB
    **
    ** Note that, as provided in the License, the Software is distributed on an
    ** "AS IS" basis, with ALL EXPRESS AND IMPLIED WARRANTIES AND CONDITIONS
    ** DISCLAIMED, INCLUDING, WITHOUT LIMITATION, ANY IMPLIED WARRANTIES AND
    ** CONDITIONS OF MERCHANTABILITY, SATISFACTORY QUALITY, FITNESS FOR A
    ** PARTICULAR PURPOSE, AND NON-INFRINGEMENT.
    **
    ** Original Code. The Original Code is: OpenGL Sample Implementation,
    ** Version 1.2.1, released January 26, 2000, developed by Silicon Graphics,
    ** Inc. The Original Code is Copyright (c) 1991-2004 Silicon Graphics, Inc.
    ** Copyright in any portions created by third parties is as indicated
    ** elsewhere herein. All Rights Reserved.
    **
    ** Additional Notice Provisions: This software was created using the
    ** OpenGL(R) version 1.2.1 Sample Implementation published by SGI, but has
    ** not been independently verified as being compliant with the OpenGL(R)
    ** version 1.2.1 Specification.
    */

    #if defined(_WIN32) && !defined(APIENTRY) && !defined(__CYGWIN__) && !defined(__SCITECH_SNAP__)
    #define WIN32_LEAN_AND_MEAN 1
    #include <windows.h>
    #endif

    #ifndef APIENTRY
    #define APIENTRY
    #endif
    #ifndef APIENTRYP
    #define APIENTRYP APIENTRY *
    #endif
    #ifndef GLAPI
    #define GLAPI extern
    #endif

    /*************************************************************/

    /* Header file version number */
    /* wglext.h last updated 2005/01/07 */
    /* Current version at http://oss.sgi.com/projects/ogl-sample/registry/ */
    #define WGL_WGLEXT_VERSION 6

    #ifndef WGL_ARB_buffer_region
    #define WGL_FRONT_COLOR_BUFFER_BIT_ARB 0x00000001
    #define WGL_BACK_COLOR_BUFFER_BIT_ARB  0x00000002
    #define WGL_DEPTH_BUFFER_BIT_ARB       0x00000004
    #define WGL_STENCIL_BUFFER_BIT_ARB     0x00000008
    #endif

    #ifndef WGL_ARB_multisample
    #define WGL_SAMPLE_BUFFERS_ARB         0x2041
    #define WGL_SAMPLES_ARB                0x2042
    #endif

    #ifndef WGL_ARB_extensions_string
    #endif

    #ifndef WGL_ARB_pixel_format
    #define WGL_NUMBER_PIXEL_FORMATS_ARB   0x2000
    #define WGL_DRAW_TO_WINDOW_ARB         0x2001
    #define WGL_DRAW_TO_BITMAP_ARB         0x2002
    #define WGL_ACCELERATION_ARB           0x2003
    #define WGL_NEED_PALETTE_ARB           0x2004
    #define WGL_NEED_SYSTEM_PALETTE_ARB    0x2005
    #define WGL_SWAP_LAYER_BUFFERS_ARB     0x2006
    #define WGL_SWAP_METHOD_ARB            0x2007
    #define WGL_NUMBER_OVERLAYS_ARB        0x2008
    #define WGL_NUMBER_UNDERLAYS_ARB       0x2009
    #define WGL_TRANSPARENT_ARB            0x200A
    #define WGL_TRANSPARENT_RED_VALUE_ARB  0x2037
    #define WGL_TRANSPARENT_GREEN_VALUE_ARB 0x2038
    #define WGL_TRANSPARENT_BLUE_VALUE_ARB 0x2039
    #define WGL_TRANSPARENT_ALPHA_VALUE_ARB 0x203A
    #define WGL_TRANSPARENT_INDEX_VALUE_ARB 0x203B
    #define WGL_SHARE_DEPTH_ARB            0x200C
    #define WGL_SHARE_STENCIL_ARB          0x200D
    #define WGL_SHARE_ACCUM_ARB            0x200E
    #define WGL_SUPPORT_GDI_ARB            0x200F
    #define WGL_SUPPORT_OPENGL_ARB         0x2010
    #define WGL_DOUBLE_BUFFER_ARB          0x2011
    #define WGL_STEREO_ARB                 0x2012
    #define WGL_PIXEL_TYPE_ARB             0x2013
    #define WGL_COLOR_BITS_ARB             0x2014
    #define WGL_RED_BITS_ARB               0x2015
    #define WGL_RED_SHIFT_ARB              0x2016
    #define WGL_GREEN_BITS_ARB             0x2017
    #define WGL_GREEN_SHIFT_ARB            0x2018
    #define WGL_BLUE_BITS_ARB              0x2019
    #define WGL_BLUE_SHIFT_ARB             0x201A
    #define WGL_ALPHA_BITS_ARB             0x201B
    #define WGL_ALPHA_SHIFT_ARB            0x201C
    #define WGL_ACCUM_BITS_ARB             0x201D
    #define WGL_ACCUM_RED_BITS_ARB         0x201E
    #define WGL_ACCUM_GREEN_BITS_ARB       0x201F
    #define WGL_ACCUM_BLUE_BITS_ARB        0x2020
    #define WGL_ACCUM_ALPHA_BITS_ARB       0x2021
    #define WGL_DEPTH_BITS_ARB             0x2022
    #define WGL_STENCIL_BITS_ARB           0x2023
    #define WGL_AUX_BUFFERS_ARB            0x2024
    #define WGL_NO_ACCELERATION_ARB        0x2025
    #define WGL_GENERIC_ACCELERATION_ARB   0x2026
    #define WGL_FULL_ACCELERATION_ARB      0x2027
    #define WGL_SWAP_EXCHANGE_ARB          0x2028
    #define WGL_SWAP_COPY_ARB              0x2029
    #define WGL_SWAP_UNDEFINED_ARB         0x202A
    #define WGL_TYPE_RGBA_ARB              0x202B
    #define WGL_TYPE_COLORINDEX_ARB        0x202C
    #endif

    #ifndef WGL_ARB_make_current_read
    #define ERROR_INVALID_PIXEL_TYPE_ARB   0x2043
    #define ERROR_INCOMPATIBLE_DEVICE_CONTEXTS_ARB 0x2054
    #endif

    #ifndef WGL_ARB_pbuffer
    #define WGL_DRAW_TO_PBUFFER_ARB        0x202D
    #define WGL_MAX_PBUFFER_PIXELS_ARB     0x202E
    #define WGL_MAX_PBUFFER_WIDTH_ARB      0x202F
    #define WGL_MAX_PBUFFER_HEIGHT_ARB     0x2030
    #define WGL_PBUFFER_LARGEST_ARB        0x2033
    #define WGL_PBUFFER_WIDTH_ARB          0x2034
    #define WGL_PBUFFER_HEIGHT_ARB         0x2035
    #define WGL_PBUFFER_LOST_ARB           0x2036
    #endif

    #ifndef WGL_ARB_render_texture
    #define WGL_BIND_TO_TEXTURE_RGB_ARB    0x2070
    #define WGL_BIND_TO_TEXTURE_RGBA_ARB   0x2071
    #define WGL_TEXTURE_FORMAT_ARB         0x2072
    #define WGL_TEXTURE_TARGET_ARB         0x2073
    #define WGL_MIPMAP_TEXTURE_ARB         0x2074
    #define WGL_TEXTURE_RGB_ARB            0x2075
    #define WGL_TEXTURE_RGBA_ARB           0x2076
    #define WGL_NO_TEXTURE_ARB             0x2077
    #define WGL_TEXTURE_CUBE_MAP_ARB       0x2078
    #define WGL_TEXTURE_1D_ARB             0x2079
    #define WGL_TEXTURE_2D_ARB             0x207A
    #define WGL_MIPMAP_LEVEL_ARB           0x207B
    #define WGL_CUBE_MAP_FACE_ARB          0x207C
    #define WGL_TEXTURE_CUBE_MAP_POSITIVE_X_ARB 0x207D
    #define WGL_TEXTURE_CUBE_MAP_NEGATIVE_X_ARB 0x207E
    #define WGL_TEXTURE_CUBE_MAP_POSITIVE_Y_ARB 0x207F
    #define WGL_TEXTURE_CUBE_MAP_NEGATIVE_Y_ARB 0x2080
    #define WGL_TEXTURE_CUBE_MAP_POSITIVE_Z_ARB 0x2081
    #define WGL_TEXTURE_CUBE_MAP_NEGATIVE_Z_ARB 0x2082
    #define WGL_FRONT_LEFT_ARB             0x2083
    #define WGL_FRONT_RIGHT_ARB            0x2084
    #define WGL_BACK_LEFT_ARB              0x2085
    #define WGL_BACK_RIGHT_ARB             0x2086
    #define WGL_AUX0_ARB                   0x2087
    #define WGL_AUX1_ARB                   0x2088
    #define WGL_AUX2_ARB                   0x2089
    #define WGL_AUX3_ARB                   0x208A
    #define WGL_AUX4_ARB                   0x208B
    #define WGL_AUX5_ARB                   0x208C
    #define WGL_AUX6_ARB                   0x208D
    #define WGL_AUX7_ARB                   0x208E
    #define WGL_AUX8_ARB                   0x208F
    #define WGL_AUX9_ARB                   0x2090
    #endif

    #ifndef WGL_ARB_pixel_format_float
    #define WGL_TYPE_RGBA_FLOAT_ARB        0x21A0
    #endif

    #ifndef WGL_EXT_make_current_read
    #define ERROR_INVALID_PIXEL_TYPE_EXT   0x2043
    #endif

    #ifndef WGL_EXT_pixel_format
    #define WGL_NUMBER_PIXEL_FORMATS_EXT   0x2000
    #define WGL_DRAW_TO_WINDOW_EXT         0x2001
    #define WGL_DRAW_TO_BITMAP_EXT         0x2002
    #define WGL_ACCELERATION_EXT           0x2003
    #define WGL_NEED_PALETTE_EXT           0x2004
    #define WGL_NEED_SYSTEM_PALETTE_EXT    0x2005
    #define WGL_SWAP_LAYER_BUFFERS_EXT     0x2006
    #define WGL_SWAP_METHOD_EXT            0x2007
    #define WGL_NUMBER_OVERLAYS_EXT        0x2008
    #define WGL_NUMBER_UNDERLAYS_EXT       0x2009
    #define WGL_TRANSPARENT_EXT            0x200A
    #define WGL_TRANSPARENT_VALUE_EXT      0x200B
    #define WGL_SHARE_DEPTH_EXT            0x200C
    #define WGL_SHARE_STENCIL_EXT          0x200D
    #define WGL_SHARE_ACCUM_EXT            0x200E
    #define WGL_SUPPORT_GDI_EXT            0x200F
    #define WGL_SUPPORT_OPENGL_EXT         0x2010
    #define WGL_DOUBLE_BUFFER_EXT          0x2011
    #define WGL_STEREO_EXT                 0x2012
    #define WGL_PIXEL_TYPE_EXT             0x2013
    #define WGL_COLOR_BITS_EXT             0x2014
    #define WGL_RED_BITS_EXT               0x2015
    #define WGL_RED_SHIFT_EXT              0x2016
    #define WGL_GREEN_BITS_EXT             0x2017
    #define WGL_GREEN_SHIFT_EXT            0x2018
    #define WGL_BLUE_BITS_EXT              0x2019
    #define WGL_BLUE_SHIFT_EXT             0x201A
    #define WGL_ALPHA_BITS_EXT             0x201B
    #define WGL_ALPHA_SHIFT_EXT            0x201C
    #define WGL_ACCUM_BITS_EXT             0x201D
    #define WGL_ACCUM_RED_BITS_EXT         0x201E
    #define WGL_ACCUM_GREEN_BITS_EXT       0x201F
    #define WGL_ACCUM_BLUE_BITS_EXT        0x2020
    #define WGL_ACCUM_ALPHA_BITS_EXT       0x2021
    #define WGL_DEPTH_BITS_EXT             0x2022
    #define WGL_STENCIL_BITS_EXT           0x2023
    #define WGL_AUX_BUFFERS_EXT            0x2024
    #define WGL_NO_ACCELERATION_EXT        0x2025
    #define WGL_GENERIC_ACCELERATION_EXT   0x2026
    #define WGL_FULL_ACCELERATION_EXT      0x2027
    #define WGL_SWAP_EXCHANGE_EXT          0x2028
    #define WGL_SWAP_COPY_EXT              0x2029
    #define WGL_SWAP_UNDEFINED_EXT         0x202A
    #define WGL_TYPE_RGBA_EXT              0x202B
    #define WGL_TYPE_COLORINDEX_EXT        0x202C
    #endif

    #ifndef WGL_EXT_pbuffer
    #define WGL_DRAW_TO_PBUFFER_EXT        0x202D
    #define WGL_MAX_PBUFFER_PIXELS_EXT     0x202E
    #define WGL_MAX_PBUFFER_WIDTH_EXT      0x202F
    #define WGL_MAX_PBUFFER_HEIGHT_EXT     0x2030
    #define WGL_OPTIMAL_PBUFFER_WIDTH_EXT  0x2031
    #define WGL_OPTIMAL_PBUFFER_HEIGHT_EXT 0x2032
    #define WGL_PBUFFER_LARGEST_EXT        0x2033
    #define WGL_PBUFFER_WIDTH_EXT          0x2034
    #define WGL_PBUFFER_HEIGHT_EXT         0x2035
    #endif

    #ifndef WGL_EXT_depth_float
    #define WGL_DEPTH_FLOAT_EXT            0x2040
    #endif

    #ifndef WGL_3DFX_multisample
    #define WGL_SAMPLE_BUFFERS_3DFX        0x2060
    #define WGL_SAMPLES_3DFX               0x2061
    #endif

    #ifndef WGL_EXT_multisample
    #define WGL_SAMPLE_BUFFERS_EXT         0x2041
    #define WGL_SAMPLES_EXT                0x2042
    #endif

    #ifndef WGL_I3D_digital_video_control
    #define WGL_DIGITAL_VIDEO_CURSOR_ALPHA_FRAMEBUFFER_I3D 0x2050
    #define WGL_DIGITAL_VIDEO_CURSOR_ALPHA_VALUE_I3D 0x2051
    #define WGL_DIGITAL_VIDEO_CURSOR_INCLUDED_I3D 0x2052
    #define WGL_DIGITAL_VIDEO_GAMMA_CORRECTED_I3D 0x2053
    #endif

    #ifndef WGL_I3D_gamma
    #define WGL_GAMMA_TABLE_SIZE_I3D       0x204E
    #define WGL_GAMMA_EXCLUDE_DESKTOP_I3D  0x204F
    #endif

    #ifndef WGL_I3D_genlock
    #define WGL_GENLOCK_SOURCE_MULTIVIEW_I3D 0x2044
    #define WGL_GENLOCK_SOURCE_EXTENAL_SYNC_I3D 0x2045
    #define WGL_GENLOCK_SOURCE_EXTENAL_FIELD_I3D 0x2046
    #define WGL_GENLOCK_SOURCE_EXTENAL_TTL_I3D 0x2047
    #define WGL_GENLOCK_SOURCE_DIGITAL_SYNC_I3D 0x2048
    #define WGL_GENLOCK_SOURCE_DIGITAL_FIELD_I3D 0x2049
    #define WGL_GENLOCK_SOURCE_EDGE_FALLING_I3D 0x204A
    #define WGL_GENLOCK_SOURCE_EDGE_RISING_I3D 0x204B
    #define WGL_GENLOCK_SOURCE_EDGE_BOTH_I3D 0x204C
    #endif

    #ifndef WGL_I3D_image_buffer
    #define WGL_IMAGE_BUFFER_MIN_ACCESS_I3D 0x00000001
    #define WGL_IMAGE_BUFFER_LOCK_I3D      0x00000002
    #endif

    #ifndef WGL_I3D_swap_frame_lock
    #endif

    #ifndef WGL_NV_render_depth_texture
    #define WGL_BIND_TO_TEXTURE_DEPTH_NV   0x20A3
    #define WGL_BIND_TO_TEXTURE_RECTANGLE_DEPTH_NV 0x20A4
    #define WGL_DEPTH_TEXTURE_FORMAT_NV    0x20A5
    #define WGL_TEXTURE_DEPTH_COMPONENT_NV 0x20A6
    #define WGL_DEPTH_COMPONENT_NV         0x20A7
    #endif

    #ifndef WGL_NV_render_texture_rectangle
    #define WGL_BIND_TO_TEXTURE_RECTANGLE_RGB_NV 0x20A0
    #define WGL_BIND_TO_TEXTURE_RECTANGLE_RGBA_NV 0x20A1
    #define WGL_TEXTURE_RECTANGLE_NV       0x20A2
    #endif

    #ifndef WGL_ATI_pixel_format_float
    #define WGL_TYPE_RGBA_FLOAT_ATI        0x21A0
    #endif

    #ifndef WGL_NV_float_buffer
    #define WGL_FLOAT_COMPONENTS_NV        0x20B0
    #define WGL_BIND_TO_TEXTURE_RECTANGLE_FLOAT_R_NV 0x20B1
    #define WGL_BIND_TO_TEXTURE_RECTANGLE_FLOAT_RG_NV 0x20B2
    #define WGL_BIND_TO_TEXTURE_RECTANGLE_FLOAT_RGB_NV 0x20B3
    #define WGL_BIND_TO_TEXTURE_RECTANGLE_FLOAT_RGBA_NV 0x20B4
    #define WGL_TEXTURE_FLOAT_R_NV         0x20B5
    #define WGL_TEXTURE_FLOAT_RG_NV        0x20B6
    #define WGL_TEXTURE_FLOAT_RGB_NV       0x20B7
    #define WGL_TEXTURE_FLOAT_RGBA_NV      0x20B8
    #endif

    /*************************************************************/

    #ifndef WGL_ARB_pbuffer
    DECLARE_HANDLE(HPBUFFERARB);
    #endif
    #ifndef WGL_EXT_pbuffer
    DECLARE_HANDLE(HPBUFFEREXT);
    #endif

    #ifndef WGL_ARB_buffer_region
    #define WGL_ARB_buffer_region 1
    #ifdef WGL_WGLEXT_PROTOTYPES
    extern HANDLE WINAPI wglCreateBufferRegionARB (HDC, int, UINT);
    extern VOID WINAPI wglDeleteBufferRegionARB (HANDLE);
    extern BOOL WINAPI wglSaveBufferRegionARB (HANDLE, int, int, int, int);
    extern BOOL WINAPI wglRestoreBufferRegionARB (HANDLE, int, int, int, int, int, int);
    #endif /* WGL_WGLEXT_PROTOTYPES */
    typedef HANDLE (WINAPI * PFNWGLCREATEBUFFERREGIONARBPROC) (HDC hDC, int iLayerPlane, UINT uType);
    typedef VOID (WINAPI * PFNWGLDELETEBUFFERREGIONARBPROC) (HANDLE hRegion);
    typedef BOOL (WINAPI * PFNWGLSAVEBUFFERREGIONARBPROC) (HANDLE hRegion, int x, int y, int width, int height);
    typedef BOOL (WINAPI * PFNWGLRESTOREBUFFERREGIONARBPROC) (HANDLE hRegion, int x, int y, int width, int height, int xSrc, int ySrc);
    #endif

    #ifndef WGL_ARB_multisample
    #define WGL_ARB_multisample 1
    #endif

    #ifndef WGL_ARB_extensions_string
    #define WGL_ARB_extensions_string 1
    #ifdef WGL_WGLEXT_PROTOTYPES
    extern const char * WINAPI wglGetExtensionsStringARB (HDC);
    #endif /* WGL_WGLEXT_PROTOTYPES */
    typedef const char * (WINAPI * PFNWGLGETEXTENSIONSSTRINGARBPROC) (HDC hdc);
    #endif

    #ifndef WGL_ARB_pixel_format
    #define WGL_ARB_pixel_format 1
    #ifdef WGL_WGLEXT_PROTOTYPES
    extern BOOL WINAPI wglGetPixelFormatAttribivARB (HDC, int, int, UINT, const int *, int *);
    extern BOOL WINAPI wglGetPixelFormatAttribfvARB (HDC, int, int, UINT, const int *, FLOAT *);
    extern BOOL WINAPI wglChoosePixelFormatARB (HDC, const int *, const FLOAT *, UINT, int *, UINT *);
    #endif /* WGL_WGLEXT_PROTOTYPES */
    typedef BOOL (WINAPI * PFNWGLGETPIXELFORMATATTRIBIVARBPROC) (HDC hdc, int iPixelFormat, int iLayerPlane, UINT nAttributes, const int *piAttributes, int *piValues);
    typedef BOOL (WINAPI * PFNWGLGETPIXELFORMATATTRIBFVARBPROC) (HDC hdc, int iPixelFormat, int iLayerPlane, UINT nAttributes, const int *piAttributes, FLOAT *pfValues);
    typedef BOOL (WINAPI * PFNWGLCHOOSEPIXELFORMATARBPROC) (HDC hdc, const int *piAttribIList, const FLOAT *pfAttribFList, UINT nMaxFormats, int *piFormats, UINT *nNumFormats);
    #endif

    #ifndef WGL_ARB_make_current_read
    #define WGL_ARB_make_current_read 1
    #ifdef WGL_WGLEXT_PROTOTYPES
    extern BOOL WINAPI wglMakeContextCurrentARB (HDC, HDC, HGLRC);
    extern HDC WINAPI wglGetCurrentReadDCARB (void);
    #endif /* WGL_WGLEXT_PROTOTYPES */
    typedef BOOL (WINAPI * PFNWGLMAKECONTEXTCURRENTARBPROC) (HDC hDrawDC, HDC hReadDC, HGLRC hglrc);
    typedef HDC (WINAPI * PFNWGLGETCURRENTREADDCARBPROC) (void);
    #endif

    #ifndef WGL_ARB_pbuffer
    #define WGL_ARB_pbuffer 1
    #ifdef WGL_WGLEXT_PROTOTYPES
    extern HPBUFFERARB WINAPI wglCreatePbufferARB (HDC, int, int, int, const int *);
    extern HDC WINAPI wglGetPbufferDCARB (HPBUFFERARB);
    extern int WINAPI wglReleasePbufferDCARB (HPBUFFERARB, HDC);
    extern BOOL WINAPI wglDestroyPbufferARB (HPBUFFERARB);
    extern BOOL WINAPI wglQueryPbufferARB (HPBUFFERARB, int, int *);
    #endif /* WGL_WGLEXT_PROTOTYPES */
    typedef HPBUFFERARB (WINAPI * PFNWGLCREATEPBUFFERARBPROC) (HDC hDC, int iPixelFormat, int iWidth, int iHeight, const int *piAttribList);
    typedef HDC (WINAPI * PFNWGLGETPBUFFERDCARBPROC) (HPBUFFERARB hPbuffer);
    typedef int (WINAPI * PFNWGLRELEASEPBUFFERDCARBPROC) (HPBUFFERARB hPbuffer, HDC hDC);
    typedef BOOL (WINAPI * PFNWGLDESTROYPBUFFERARBPROC) (HPBUFFERARB hPbuffer);
    typedef BOOL (WINAPI * PFNWGLQUERYPBUFFERARBPROC) (HPBUFFERARB hPbuffer, int iAttribute, int *piValue);
    #endif

    #ifndef WGL_ARB_render_texture
    #define WGL_ARB_render_texture 1
    #ifdef WGL_WGLEXT_PROTOTYPES
    extern BOOL WINAPI wglBindTexImageARB (HPBUFFERARB, int);
    extern BOOL WINAPI wglReleaseTexImageARB (HPBUFFERARB, int);
    extern BOOL WINAPI wglSetPbufferAttribARB (HPBUFFERARB, const int *);
    #endif /* WGL_WGLEXT_PROTOTYPES */
    typedef BOOL (WINAPI * PFNWGLBINDTEXIMAGEARBPROC) (HPBUFFERARB hPbuffer, int iBuffer);
    typedef BOOL (WINAPI * PFNWGLRELEASETEXIMAGEARBPROC) (HPBUFFERARB hPbuffer, int iBuffer);
    typedef BOOL (WINAPI * PFNWGLSETPBUFFERATTRIBARBPROC) (HPBUFFERARB hPbuffer, const int *piAttribList);
    #endif

    #ifndef WGL_ARB_pixel_format_float
    #define WGL_ARB_pixel_format_float 1
    #endif

    #ifndef WGL_EXT_display_color_table
    #define WGL_EXT_display_color_table 1
    #ifdef WGL_WGLEXT_PROTOTYPES
    extern GLboolean WINAPI wglCreateDisplayColorTableEXT (GLushort);
    extern GLboolean WINAPI wglLoadDisplayColorTableEXT (const GLushort *, GLuint);
    extern GLboolean WINAPI wglBindDisplayColorTableEXT (GLushort);
    extern VOID WINAPI wglDestroyDisplayColorTableEXT (GLushort);
    #endif /* WGL_WGLEXT_PROTOTYPES */
    typedef GLboolean (WINAPI * PFNWGLCREATEDISPLAYCOLORTABLEEXTPROC) (GLushort id);
    typedef GLboolean (WINAPI * PFNWGLLOADDISPLAYCOLORTABLEEXTPROC) (const GLushort *table, GLuint length);
    typedef GLboolean (WINAPI * PFNWGLBINDDISPLAYCOLORTABLEEXTPROC) (GLushort id);
    typedef VOID (WINAPI * PFNWGLDESTROYDISPLAYCOLORTABLEEXTPROC) (GLushort id);
    #endif

    #ifndef WGL_EXT_extensions_string
    #define WGL_EXT_extensions_string 1
    #ifdef WGL_WGLEXT_PROTOTYPES
    extern const char * WINAPI wglGetExtensionsStringEXT (void);
    #endif /* WGL_WGLEXT_PROTOTYPES */
    typedef const char * (WINAPI * PFNWGLGETEXTENSIONSSTRINGEXTPROC) (void);
    #endif

    #ifndef WGL_EXT_make_current_read
    #define WGL_EXT_make_current_read 1
    #ifdef WGL_WGLEXT_PROTOTYPES
    extern BOOL WINAPI wglMakeContextCurrentEXT (HDC, HDC, HGLRC);
    extern HDC WINAPI wglGetCurrentReadDCEXT (void);
    #endif /* WGL_WGLEXT_PROTOTYPES */
    typedef BOOL (WINAPI * PFNWGLMAKECONTEXTCURRENTEXTPROC) (HDC hDrawDC, HDC hReadDC, HGLRC hglrc);
    typedef HDC (WINAPI * PFNWGLGETCURRENTREADDCEXTPROC) (void);
    #endif

    #ifndef WGL_EXT_pbuffer
    #define WGL_EXT_pbuffer 1
    #ifdef WGL_WGLEXT_PROTOTYPES
    extern HPBUFFEREXT WINAPI wglCreatePbufferEXT (HDC, int, int, int, const int *);
    extern HDC WINAPI wglGetPbufferDCEXT (HPBUFFEREXT);
    extern int WINAPI wglReleasePbufferDCEXT (HPBUFFEREXT, HDC);
    extern BOOL WINAPI wglDestroyPbufferEXT (HPBUFFEREXT);
    extern BOOL WINAPI wglQueryPbufferEXT (HPBUFFEREXT, int, int *);
    #endif /* WGL_WGLEXT_PROTOTYPES */
    typedef HPBUFFEREXT (WINAPI * PFNWGLCREATEPBUFFEREXTPROC) (HDC hDC, int iPixelFormat, int iWidth, int iHeight, const int *piAttribList);
    typedef HDC (WINAPI * PFNWGLGETPBUFFERDCEXTPROC) (HPBUFFEREXT hPbuffer);
    typedef int (WINAPI * PFNWGLRELEASEPBUFFERDCEXTPROC) (HPBUFFEREXT hPbuffer, HDC hDC);
    typedef BOOL (WINAPI * PFNWGLDESTROYPBUFFEREXTPROC) (HPBUFFEREXT hPbuffer);
    typedef BOOL (WINAPI * PFNWGLQUERYPBUFFEREXTPROC) (HPBUFFEREXT hPbuffer, int iAttribute, int *piValue);
    #endif

    #ifndef WGL_EXT_pixel_format
    #define WGL_EXT_pixel_format 1
    #ifdef WGL_WGLEXT_PROTOTYPES
    extern BOOL WINAPI wglGetPixelFormatAttribivEXT (HDC, int, int, UINT, int *, int *);
    extern BOOL WINAPI wglGetPixelFormatAttribfvEXT (HDC, int, int, UINT, int *, FLOAT *);
    extern BOOL WINAPI wglChoosePixelFormatEXT (HDC, const int *, const FLOAT *, UINT, int *, UINT *);
    #endif /* WGL_WGLEXT_PROTOTYPES */
    typedef BOOL (WINAPI * PFNWGLGETPIXELFORMATATTRIBIVEXTPROC) (HDC hdc, int iPixelFormat, int iLayerPlane, UINT nAttributes, int *piAttributes, int *piValues);
    typedef BOOL (WINAPI * PFNWGLGETPIXELFORMATATTRIBFVEXTPROC) (HDC hdc, int iPixelFormat, int iLayerPlane, UINT nAttributes, int *piAttributes, FLOAT *pfValues);
    typedef BOOL (WINAPI * PFNWGLCHOOSEPIXELFORMATEXTPROC) (HDC hdc, const int *piAttribIList, const FLOAT *pfAttribFList, UINT nMaxFormats, int *piFormats, UINT *nNumFormats);
    #endif

    #ifndef WGL_EXT_swap_control
    #define WGL_EXT_swap_control 1
    #ifdef WGL_WGLEXT_PROTOTYPES
    extern BOOL WINAPI wglSwapIntervalEXT (int);
    extern int WINAPI wglGetSwapIntervalEXT (void);
    #endif /* WGL_WGLEXT_PROTOTYPES */
    typedef BOOL (WINAPI * PFNWGLSWAPINTERVALEXTPROC) (int interval);
    typedef int (WINAPI * PFNWGLGETSWAPINTERVALEXTPROC) (void);
    #endif

    #ifndef WGL_EXT_depth_float
    #define WGL_EXT_depth_float 1
    #endif

    #ifndef WGL_NV_vertex_array_range
    #define WGL_NV_vertex_array_range 1
    #ifdef WGL_WGLEXT_PROTOTYPES
    extern void* WINAPI wglAllocateMemoryNV (GLsizei, GLfloat, GLfloat, GLfloat);
    extern void WINAPI wglFreeMemoryNV (void *);
    #endif /* WGL_WGLEXT_PROTOTYPES */
    typedef void* (WINAPI * PFNWGLALLOCATEMEMORYNVPROC) (GLsizei size, GLfloat readfreq, GLfloat writefreq, GLfloat priority);
    typedef void (WINAPI * PFNWGLFREEMEMORYNVPROC) (void *pointer);
    #endif

    #ifndef WGL_3DFX_multisample
    #define WGL_3DFX_multisample 1
    #endif

    #ifndef WGL_EXT_multisample
    #define WGL_EXT_multisample 1
    #endif

    #ifndef WGL_OML_sync_control
    #define WGL_OML_sync_control 1
    #ifdef WGL_WGLEXT_PROTOTYPES
    extern BOOL WINAPI wglGetSyncValuesOML (HDC, INT64 *, INT64 *, INT64 *);
    extern BOOL WINAPI wglGetMscRateOML (HDC, INT32 *, INT32 *);
    extern INT64 WINAPI wglSwapBuffersMscOML (HDC, INT64, INT64, INT64);
    extern INT64 WINAPI wglSwapLayerBuffersMscOML (HDC, int, INT64, INT64, INT64);
    extern BOOL WINAPI wglWaitForMscOML (HDC, INT64, INT64, INT64, INT64 *, INT64 *, INT64 *);
    extern BOOL WINAPI wglWaitForSbcOML (HDC, INT64, INT64 *, INT64 *, INT64 *);
    #endif /* WGL_WGLEXT_PROTOTYPES */
    typedef BOOL (WINAPI * PFNWGLGETSYNCVALUESOMLPROC) (HDC hdc, INT64 *ust, INT64 *msc, INT64 *sbc);
    typedef BOOL (WINAPI * PFNWGLGETMSCRATEOMLPROC) (HDC hdc, INT32 *numerator, INT32 *denominator);
    typedef INT64 (WINAPI * PFNWGLSWAPBUFFERSMSCOMLPROC) (HDC hdc, INT64 target_msc, INT64 divisor, INT64 remainder);
    typedef INT64 (WINAPI * PFNWGLSWAPLAYERBUFFERSMSCOMLPROC) (HDC hdc, int fuPlanes, INT64 target_msc, INT64 divisor, INT64 remainder);
    typedef BOOL (WINAPI * PFNWGLWAITFORMSCOMLPROC) (HDC hdc, INT64 target_msc, INT64 divisor, INT64 remainder, INT64 *ust, INT64 *msc, INT64 *sbc);
    typedef BOOL (WINAPI * PFNWGLWAITFORSBCOMLPROC) (HDC hdc, INT64 target_sbc, INT64 *ust, INT64 *msc, INT64 *sbc);
    #endif

    #ifndef WGL_I3D_digital_video_control
    #define WGL_I3D_digital_video_control 1
    #ifdef WGL_WGLEXT_PROTOTYPES
    extern BOOL WINAPI wglGetDigitalVideoParametersI3D (HDC, int, int *);
    extern BOOL WINAPI wglSetDigitalVideoParametersI3D (HDC, int, const int *);
    #endif /* WGL_WGLEXT_PROTOTYPES */
    typedef BOOL (WINAPI * PFNWGLGETDIGITALVIDEOPARAMETERSI3DPROC) (HDC hDC, int iAttribute, int *piValue);
    typedef BOOL (WINAPI * PFNWGLSETDIGITALVIDEOPARAMETERSI3DPROC) (HDC hDC, int iAttribute, const int *piValue);
    #endif

    #ifndef WGL_I3D_gamma
    #define WGL_I3D_gamma 1
    #ifdef WGL_WGLEXT_PROTOTYPES
    extern BOOL WINAPI wglGetGammaTableParametersI3D (HDC, int, int *);
    extern BOOL WINAPI wglSetGammaTableParametersI3D (HDC, int, const int *);
    extern BOOL WINAPI wglGetGammaTableI3D (HDC, int, USHORT *, USHORT *, USHORT *);
    extern BOOL WINAPI wglSetGammaTableI3D (HDC, int, const USHORT *, const USHORT *, const USHORT *);
    #endif /* WGL_WGLEXT_PROTOTYPES */
    typedef BOOL (WINAPI * PFNWGLGETGAMMATABLEPARAMETERSI3DPROC) (HDC hDC, int iAttribute, int *piValue);
    typedef BOOL (WINAPI * PFNWGLSETGAMMATABLEPARAMETERSI3DPROC) (HDC hDC, int iAttribute, const int *piValue);
    typedef BOOL (WINAPI * PFNWGLGETGAMMATABLEI3DPROC) (HDC hDC, int iEntries, USHORT *puRed, USHORT *puGreen, USHORT *puBlue);
    typedef BOOL (WINAPI * PFNWGLSETGAMMATABLEI3DPROC) (HDC hDC, int iEntries, const USHORT *puRed, const USHORT *puGreen, const USHORT *puBlue);
    #endif

    #ifndef WGL_I3D_genlock
    #define WGL_I3D_genlock 1
    #ifdef WGL_WGLEXT_PROTOTYPES
    extern BOOL WINAPI wglEnableGenlockI3D (HDC);
    extern BOOL WINAPI wglDisableGenlockI3D (HDC);
    extern BOOL WINAPI wglIsEnabledGenlockI3D (HDC, BOOL *);
    extern BOOL WINAPI wglGenlockSourceI3D (HDC, UINT);
    extern BOOL WINAPI wglGetGenlockSourceI3D (HDC, UINT *);
    extern BOOL WINAPI wglGenlockSourceEdgeI3D (HDC, UINT);
    extern BOOL WINAPI wglGetGenlockSourceEdgeI3D (HDC, UINT *);
    extern BOOL WINAPI wglGenlockSampleRateI3D (HDC, UINT);
    extern BOOL WINAPI wglGetGenlockSampleRateI3D (HDC, UINT *);
    extern BOOL WINAPI wglGenlockSourceDelayI3D (HDC, UINT);
    extern BOOL WINAPI wglGetGenlockSourceDelayI3D (HDC, UINT *);
    extern BOOL WINAPI wglQueryGenlockMaxSourceDelayI3D (HDC, UINT *, UINT *);
    #endif /* WGL_WGLEXT_PROTOTYPES */
    typedef BOOL (WINAPI * PFNWGLENABLEGENLOCKI3DPROC) (HDC hDC);
    typedef BOOL (WINAPI * PFNWGLDISABLEGENLOCKI3DPROC) (HDC hDC);
    typedef BOOL (WINAPI * PFNWGLISENABLEDGENLOCKI3DPROC) (HDC hDC, BOOL *pFlag);
    typedef BOOL (WINAPI * PFNWGLGENLOCKSOURCEI3DPROC) (HDC hDC, UINT uSource);
    typedef BOOL (WINAPI * PFNWGLGETGENLOCKSOURCEI3DPROC) (HDC hDC, UINT *uSource);
    typedef BOOL (WINAPI * PFNWGLGENLOCKSOURCEEDGEI3DPROC) (HDC hDC, UINT uEdge);
    typedef BOOL (WINAPI * PFNWGLGETGENLOCKSOURCEEDGEI3DPROC) (HDC hDC, UINT *uEdge);
    typedef BOOL (WINAPI * PFNWGLGENLOCKSAMPLERATEI3DPROC) (HDC hDC, UINT uRate);
    typedef BOOL (WINAPI * PFNWGLGETGENLOCKSAMPLERATEI3DPROC) (HDC hDC, UINT *uRate);
    typedef BOOL (WINAPI * PFNWGLGENLOCKSOURCEDELAYI3DPROC) (HDC hDC, UINT uDelay);
    typedef BOOL (WINAPI * PFNWGLGETGENLOCKSOURCEDELAYI3DPROC) (HDC hDC, UINT *uDelay);
    typedef BOOL (WINAPI * PFNWGLQUERYGENLOCKMAXSOURCEDELAYI3DPROC) (HDC hDC, UINT *uMaxLineDelay, UINT *uMaxPixelDelay);
    #endif

    #ifndef WGL_I3D_image_buffer
    #define WGL_I3D_image_buffer 1
    #ifdef WGL_WGLEXT_PROTOTYPES
    extern LPVOID WINAPI wglCreateImageBufferI3D (HDC, DWORD, UINT);
    extern BOOL WINAPI wglDestroyImageBufferI3D (HDC, LPVOID);
    extern BOOL WINAPI wglAssociateImageBufferEventsI3D (HDC, const HANDLE *, const LPVOID *, const DWORD *, UINT);
    extern BOOL WINAPI wglReleaseImageBufferEventsI3D (HDC, const LPVOID *, UINT);
    #endif /* WGL_WGLEXT_PROTOTYPES */
    typedef LPVOID (WINAPI * PFNWGLCREATEIMAGEBUFFERI3DPROC) (HDC hDC, DWORD dwSize, UINT uFlags);
    typedef BOOL (WINAPI * PFNWGLDESTROYIMAGEBUFFERI3DPROC) (HDC hDC, LPVOID pAddress);
    typedef BOOL (WINAPI * PFNWGLASSOCIATEIMAGEBUFFEREVENTSI3DPROC) (HDC hDC, const HANDLE *pEvent, const LPVOID *pAddress, const DWORD *pSize, UINT count);
    typedef BOOL (WINAPI * PFNWGLRELEASEIMAGEBUFFEREVENTSI3DPROC) (HDC hDC, const LPVOID *pAddress, UINT count);
    #endif

    #ifndef WGL_I3D_swap_frame_lock
    #define WGL_I3D_swap_frame_lock 1
    #ifdef WGL_WGLEXT_PROTOTYPES
    extern BOOL WINAPI wglEnableFrameLockI3D (void);
    extern BOOL WINAPI wglDisableFrameLockI3D (void);
    extern BOOL WINAPI wglIsEnabledFrameLockI3D (BOOL *);
    extern BOOL WINAPI wglQueryFrameLockMasterI3D (BOOL *);
    #endif /* WGL_WGLEXT_PROTOTYPES */
    typedef BOOL (WINAPI * PFNWGLENABLEFRAMELOCKI3DPROC) (void);
    typedef BOOL (WINAPI * PFNWGLDISABLEFRAMELOCKI3DPROC) (void);
    typedef BOOL (WINAPI * PFNWGLISENABLEDFRAMELOCKI3DPROC) (BOOL *pFlag);
    typedef BOOL (WINAPI * PFNWGLQUERYFRAMELOCKMASTERI3DPROC) (BOOL *pFlag);
    #endif

    #ifndef WGL_I3D_swap_frame_usage
    #define WGL_I3D_swap_frame_usage 1
    #ifdef WGL_WGLEXT_PROTOTYPES
    extern BOOL WINAPI wglGetFrameUsageI3D (float *);
    extern BOOL WINAPI wglBeginFrameTrackingI3D (void);
    extern BOOL WINAPI wglEndFrameTrackingI3D (void);
    extern BOOL WINAPI wglQueryFrameTrackingI3D (DWORD *, DWORD *, float *);
    #endif /* WGL_WGLEXT_PROTOTYPES */
    typedef BOOL (WINAPI * PFNWGLGETFRAMEUSAGEI3DPROC) (float *pUsage);
    typedef BOOL (WINAPI * PFNWGLBEGINFRAMETRACKINGI3DPROC) (void);
    typedef BOOL (WINAPI * PFNWGLENDFRAMETRACKINGI3DPROC) (void);
    typedef BOOL (WINAPI * PFNWGLQUERYFRAMETRACKINGI3DPROC) (DWORD *pFrameCount, DWORD *pMissedFrames, float *pLastMissedUsage);
    #endif

    #ifndef WGL_ATI_pixel_format_float
    #define WGL_ATI_pixel_format_float 1
    #endif

    #ifndef WGL_NV_float_buffer
    #define WGL_NV_float_buffer 1
    #endif

    #ifdef __cplusplus
    }
    #endif

    #endif