#ifndef __gl_core_h_
#define __gl_core_h_

/*
** 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: The application programming interfaces
** established by SGI in conjunction with the Original Code are The
** OpenGL(R) Graphics System: A Specification (Version 1.2.1), released
** April 1, 1999; The OpenGL(R) Graphics System Utility Library (Version
** 1.3), released November 4, 1998; and OpenGL(R) Graphics with the X
** Window System(R) (Version 1.3), released October 19, 1998. 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.
**
*/

#include <sys/types.h>

#define GL_CORE_SGI  1
#define GL_CORE_MESA 2
#define GL_CORE_APPLE 4
#define GL_CORE_WINDOWS 8

typedef struct __GLcontextRec __GLcontext;

/*
** This file defines the interface between the GL core and the surrounding
** "operating system" that supports it (currently the GLX or WGL extensions).
**
** Members (data and function pointers) are documented as imported or
** exported according to how they are used by the core rendering functions.
** Imported members are initialized by the "operating system" and used by
** the core functions.  Exported members are initialized by the core functions
** and used by the "operating system".
*/

/**
 * Mode and limit information for a context.  This information is
 * kept around in the context so that values can be used during
 * command execution, and for returning information about the
 * context to the application.
 * 
 * Instances of this structure are shared by the driver and the loader.  To
 * maintain binary compatability, new fields \b must be added only to the
 * end of the structure.
 * 
 * \sa _gl_context_modes_create
 */
typedef struct __GLcontextModesRec {
    struct __GLcontextModesRec * next;

    GLboolean rgbMode;
    GLboolean floatMode;
    GLboolean colorIndexMode;
    GLuint doubleBufferMode;
    GLuint stereoMode;

    GLboolean haveAccumBuffer;
    GLboolean haveDepthBuffer;
    GLboolean haveStencilBuffer;

    GLint redBits, greenBits, blueBits, alphaBits;	/* bits per comp */
    GLuint redMask, greenMask, blueMask, alphaMask;
    GLint rgbBits;		/* total bits for rgb */
    GLint indexBits;		/* total bits for colorindex */

    GLint accumRedBits, accumGreenBits, accumBlueBits, accumAlphaBits;
    GLint depthBits;
    GLint stencilBits;

    GLint numAuxBuffers;

    GLint level;

    GLint pixmapMode;

    /* GLX */
    GLint visualID;
    GLint visualType;     /**< One of the GLX X visual types. (i.e., 
			   * \c GLX_TRUE_COLOR, etc.)
			   */

    /* EXT_visual_rating / GLX 1.2 */
    GLint visualRating;

    /* EXT_visual_info / GLX 1.2 */
    GLint transparentPixel;
				/*    colors are floats scaled to ints */
    GLint transparentRed, transparentGreen, transparentBlue, transparentAlpha;
    GLint transparentIndex;

    /* ARB_multisample / SGIS_multisample */
    GLint sampleBuffers;
    GLint samples;

    /* SGIX_fbconfig / GLX 1.3 */
    GLint drawableType;
    GLint renderType;
    GLint xRenderable;
    GLint fbconfigID;

    /* SGIX_pbuffer / GLX 1.3 */
    GLint maxPbufferWidth;
    GLint maxPbufferHeight;
    GLint maxPbufferPixels;
    GLint optimalPbufferWidth;   /* Only for SGIX_pbuffer. */
    GLint optimalPbufferHeight;  /* Only for SGIX_pbuffer. */

    /* SGIX_visual_select_group */
    GLint visualSelectGroup;

    /* OML_swap_method */
    GLint swapMethod;

    GLint screen;

    /* EXT_texture_from_pixmap */
    GLint bindToTextureRgb;
    GLint bindToTextureRgba;
    GLint bindToMipmapTexture;
    GLint bindToTextureTargets;
    GLint yInverted;
} __GLcontextModes;

/* Several fields of __GLcontextModes can take these as values.  Since
 * GLX header files may not be available everywhere they need to be used,
 * redefine them here.
 */
#define GLX_NONE                           0x8000
#define GLX_SLOW_CONFIG                    0x8001
#define GLX_TRUE_COLOR                     0x8002
#define GLX_DIRECT_COLOR                   0x8003
#define GLX_PSEUDO_COLOR                   0x8004
#define GLX_STATIC_COLOR                   0x8005
#define GLX_GRAY_SCALE                     0x8006
#define GLX_STATIC_GRAY                    0x8007
#define GLX_TRANSPARENT_RGB                0x8008
#define GLX_TRANSPARENT_INDEX              0x8009
#define GLX_NON_CONFORMANT_CONFIG          0x800D
#define GLX_SWAP_EXCHANGE_OML              0x8061
#define GLX_SWAP_COPY_OML                  0x8062
#define GLX_SWAP_UNDEFINED_OML             0x8063

#define GLX_DONT_CARE                      0xFFFFFFFF

#define GLX_RGBA_BIT                       0x00000001
#define GLX_COLOR_INDEX_BIT                0x00000002
#define GLX_WINDOW_BIT                     0x00000001
#define GLX_PIXMAP_BIT                     0x00000002
#define GLX_PBUFFER_BIT                    0x00000004

#define GLX_BIND_TO_TEXTURE_RGB_EXT        0x20D0
#define GLX_BIND_TO_TEXTURE_RGBA_EXT       0x20D1
#define GLX_BIND_TO_MIPMAP_TEXTURE_EXT     0x20D2
#define GLX_BIND_TO_TEXTURE_TARGETS_EXT    0x20D3
#define GLX_Y_INVERTED_EXT                 0x20D4

#define GLX_TEXTURE_1D_BIT_EXT             0x00000001
#define GLX_TEXTURE_2D_BIT_EXT             0x00000002
#define GLX_TEXTURE_RECTANGLE_BIT_EXT      0x00000004


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

#ifdef _NEED_GL_CORE_IF

/**
 * The GLcore interface (a subset of the XMesa interface)
 */
#define __GL_CORE "GL_Core"

typedef struct __GLcoreModuleRec {
    /*
     * XMesaVisual
     */
    XMesaVisual (*XMesaCreateVisual)( ScreenPtr display,
                                      VisualPtr visinfo,
                                      GLboolean rgb_flag,
                                      GLboolean alpha_flag,
                                      GLboolean db_flag,
                                      GLboolean stereo_flag,
                                      GLboolean ximage_flag,
                                      GLint depth_size,
                                      GLint stencil_size,
                                      GLint accum_red_size,
                                      GLint accum_green_size,
                                      GLint accum_blue_size,
                                      GLint accum_alpha_size,
                                      GLint num_samples,
                                      GLint level,
                                      GLint visualCaveat );

    void (*XMesaDestroyVisual)( XMesaVisual v );

    /*
     * XMesaBuffer
     */
    XMesaBuffer (*XMesaCreateWindowBuffer)( XMesaVisual v,
					    WindowPtr w );

    XMesaBuffer (*XMesaCreatePixmapBuffer)( XMesaVisual v,
					    PixmapPtr p,
					    ColormapPtr cmap );

    void (*XMesaDestroyBuffer)( XMesaBuffer b );

    void (*XMesaSwapBuffers)( XMesaBuffer b );

    void (*XMesaResizeBuffers)( XMesaBuffer b );

    /*
     * XMesaContext
     */
    XMesaContext (*XMesaCreateContext)( XMesaVisual v,
					XMesaContext share_list );

    void (*XMesaDestroyContext)( XMesaContext c );

    GLboolean (*XMesaCopyContext)( XMesaContext src,
				   XMesaContext dst,
				   GLuint mask );

    GLboolean (*XMesaMakeCurrent2)( XMesaContext c,
				    XMesaBuffer drawBuffer,
				    XMesaBuffer readBuffer );

    GLboolean (*XMesaForceCurrent)( XMesaContext c );

    GLboolean (*XMesaLoseCurrent)( XMesaContext c );

} __GLcoreModule;

#endif /* _NEED_GL_CORE_IF */

#endif /* __gl_core_h_ */