#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) 1991-2000 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__)
#define WIN32_LEAN_AND_MEAN 1
#include <windows.h>
#endif

#ifndef APIENTRY
#define APIENTRY
#endif

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

/* Header file version number */
#define WGL_WGLEXT_VERSION 1

#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_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_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_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_EXT_depth_float
#define WGL_DEPTH_FLOAT_EXT                0x2040
#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_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_NV_render_depth_texture
#define WGL_TEXTURE_DEPTH_COMPONENT_NV          0x20A6
#define WGL_DEPTH_TEXTURE_FORMAT_NV             0x20A5
#define WGL_BIND_TO_TEXTURE_DEPTH_NV            0x20A3
#define WGL_BIND_TO_TEXTURE_RECTANGLE_DEPTH_NV  0x20A4
#define WGL_DEPTH_COMPONENT_NV                  0x20A7
#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_ARB_multisample
#define WGL_SAMPLE_BUFFERS_ARB	0x2041
#define WGL_SAMPLES_ARB		0x2042
#endif

#ifndef WGL_ATI_pixel_format_float
#define GL_RGBA_FLOAT_MODE_ATI             0x8820
#define GL_COLOR_CLEAR_UNCLAMPED_VALUE_ATI 0x8835
#define WGL_TYPE_RGBA_FLOAT_ATI            0x21A0
#endif

#ifndef WGL_I3D_unknown_genlock_extension_name
#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_unknown_gamma_extension_name
#define WGL_GAMMA_TABLE_SIZE_I3D       0x204E
#define WGL_GAMMA_EXCLUDE_DESKTOP_I3D  0x204F
#endif

#ifndef WGL_I3D_unknown_digital_video_cursor_extension_name
#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_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_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);
extern PFNWGLGETEXTENSIONSSTRINGARBPROC    wglGetExtensionsStringARB;
#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);
extern PFNWGLGETPIXELFORMATATTRIBIVARBPROC wglGetPixelFormatAttribivARB;
extern PFNWGLGETPIXELFORMATATTRIBFVARBPROC wglGetPixelFormatAttribfvARB;
extern PFNWGLCHOOSEPIXELFORMATARBPROC      wglChoosePixelFormatARB;
#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);
extern PFNWGLCREATEPBUFFERARBPROC          wglCreatePbufferARB;
extern PFNWGLGETPBUFFERDCARBPROC           wglGetPbufferDCARB;
extern PFNWGLRELEASEPBUFFERDCARBPROC       wglReleasePbufferDCARB;
extern PFNWGLDESTROYPBUFFERARBPROC         wglDestroyPbufferARB;
extern PFNWGLQUERYPBUFFERARBPROC           wglQueryPbufferARB;
#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_3DFX_multisample
#define WGL_3DFX_multisample 1
#endif

#ifndef WGL_EXT_multisample
#define WGL_EXT_multisample 1
#endif

/* added by Cass -- but this should already be in here! */
#ifndef WGL_NV_allocate_memory
#define WGL_NV_allocate_memory 1
#ifdef WGL_WGLEXT_PROTOTYPES
extern void * wglAllocateMemoryNV(int size, float readfreq, float writefreq, float priority);
extern void wglFreeMemoryNV(void * pointer); 
#endif
typedef void * (APIENTRY * PFNWGLALLOCATEMEMORYNVPROC) (int size, float readfreq, float writefreq, float priority);
typedef void (APIENTRY * PFNWGLFREEMEMORYNVPROC) (void *pointer);
#endif

#ifndef WGL_ARB_render_texture
#define WGL_ARB_render_texture 1
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_NV_float_buffer
#define WGL_NV_float_buffer 1
#endif

#ifndef WGL_NV_render_texture_rectangle
#define WGL_NV_render_texture_rectangle 1
#endif

#ifndef WGL_NV_render_depth_texture
#define WGL_NV_render_depth_texture 1
#endif

#ifndef WGL_ARB_multisample
#define WGL_ARB_multisample 1
#endif

#ifndef WGL_ATI_pixel_format_float
#define WGL_ATI_pixel_format_float 1
#endif

#ifdef __cplusplus
}
#endif

#include <string>
void InitWGLExtensions(HINSTANCE);
bool WGLExtensionSupported(const std::string& extName);

#endif


