src/mesa/drivers/x11/xmesaP.h

   1 /*
   2  * Mesa 3-D graphics library
   3  * Version:  6.5
   4  *
   5  * Copyright (C) 1999-2006  Brian Paul   All Rights Reserved.
   6  *
   7  * Permission is hereby granted, free of charge, to any person obtaining a
   8  * copy of this software and associated documentation files (the "Software"),
   9  * to deal in the Software without restriction, including without limitation
  10  * the rights to use, copy, modify, merge, publish, distribute, sublicense,
  11  * and/or sell copies of the Software, and to permit persons to whom the
  12  * Software is furnished to do so, subject to the following conditions:
  13  *
  14  * The above copyright notice and this permission notice shall be included
  15  * in all copies or substantial portions of the Software.
  16  *
  17  * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS
  18  * OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
  19  * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT.  IN NO EVENT SHALL
  20  * BRIAN PAUL BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN
  21  * AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN
  22  * CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE.
  23  */
  24
  25
  26 #ifndef XMESAP_H
  27 #define XMESAP_H
  28
  29
  30 #ifdef XFree86Server
  31 # include "xf86glx_util.h"
  32 #elif defined(USE_XSHM)
  33 # include <X11/extensions/XShm.h>
  34 #endif
  35 #include "GL/xmesa.h"
  36 #include "mtypes.h"
  37 #if defined(FX)
  38 #include "GL/fxmesa.h"
  39 #include "../glide/fxdrv.h"
  40 #endif
  41
  42
  43 extern _glthread_Mutex _xmesa_lock;
  44
  45
  46 /* for PF_8R8G8B24 pixel format */
  47 typedef struct {
  48    GLubyte b;
  49    GLubyte g;
  50    GLubyte r;
  51 } bgr_t;
  52
  53
  54 struct xmesa_renderbuffer;
  55
  56
  57 /* Function pointer for clearing color buffers */
  58 typedef void (*ClearFunc)( GLcontext *ctx, struct xmesa_renderbuffer *xrb,
  59                            GLint x, GLint y, GLint width, GLint height );
  60
  61
  62
  63
  64 /** Framebuffer pixel formats */
  65 enum pixel_format {
  66    PF_Index,            /**< Color Index mode */
  67    PF_Truecolor,        /**< TrueColor or DirectColor, any depth */
  68    PF_Dither_True,      /**< TrueColor with dithering */
  69    PF_8A8B8G8R,         /**< 32-bit TrueColor:  8-A, 8-B, 8-G, 8-R */
  70    PF_8R8G8B,           /**< 32-bit TrueColor:  8-R, 8-G, 8-B bits */
  71    PF_5R6G5B,           /**< 16-bit TrueColor:  5-R, 6-G, 5-B bits */
  72    PF_Dither,           /**< Color-mapped RGB with dither */
  73    PF_Lookup,           /**< Color-mapped RGB without dither */
  74    PF_HPCR,             /**< HP Color Recovery (ad@lms.be 30/08/95) */
  75    PF_1Bit,             /**< monochrome dithering of RGB */
  76    PF_Grayscale,        /**< Grayscale or StaticGray */
  77    PF_8R8G8B24,         /**< 24-bit TrueColor: 8-R, 8-G, 8-B bits */
  78    PF_Dither_5R6G5B,    /**< 16-bit dithered TrueColor: 5-R, 6-G, 5-B */
  79    PF_8A8R8G8B          /**< 32-bit TrueColor:  8-A, 8-R, 8-G, 8-B */
  80 };
  81
  82
  83 /**
  84  * Visual inforation, derived from GLvisual.
  85  * Basically corresponds to an XVisualInfo.
  86  */
  87 struct xmesa_visual {
  88    GLvisual mesa_visual;        /* Device independent visual parameters */
  89    XMesaDisplay *display;       /* The X11 display */
  90 #ifdef XFree86Server
  91    GLint ColormapEntries;
  92    GLint nplanes;
  93 #else
  94    XMesaVisualInfo visinfo;     /* X's visual info (pointer to private copy) */
  95    XVisualInfo *vishandle;      /* Only used in fakeglx.c */
  96 #endif
  97    GLint BitsPerPixel;          /* True bits per pixel for XImages */
  98
  99    GLboolean ximage_flag;       /* Use XImage for back buffer (not pixmap)? */
 100
 101    enum pixel_format dithered_pf;  /* Pixel format when dithering */
 102    enum pixel_format undithered_pf;/* Pixel format when not dithering */
 103
 104    GLfloat RedGamma;            /* Gamma values, 1.0 is default */
 105    GLfloat GreenGamma;
 106    GLfloat BlueGamma;
 107
 108    /* For PF_TRUECOLOR */
 109    GLint rshift, gshift, bshift;/* Pixel color component shifts */
 110    GLubyte Kernel[16];          /* Dither kernel */
 111    unsigned long RtoPixel[512]; /* RGB to pixel conversion */
 112    unsigned long GtoPixel[512];
 113    unsigned long BtoPixel[512];
 114    GLubyte PixelToR[256];       /* Pixel to RGB conversion */
 115    GLubyte PixelToG[256];
 116    GLubyte PixelToB[256];
 117
 118    /* For PF_HPCR */
 119    short       hpcr_rgbTbl[3][256];
 120    GLboolean   hpcr_clear_flag;
 121    GLubyte     hpcr_clear_ximage_pattern[2][16];
 122    XMesaImage *hpcr_clear_ximage;
 123    XMesaPixmap hpcr_clear_pixmap;
 124
 125    /* For PF_1BIT */
 126    int bitFlip;
 127 };
 128
 129
 130 /**
 131  * Context info, dDerived from GLcontext.
 132  * Basically corresponds to a GLXContext.
 133  */
 134 struct xmesa_context {
 135    GLcontext mesa;              /* the core library context (containment) */
 136    XMesaVisual xm_visual;       /* Describes the buffers */
 137    XMesaBuffer xm_buffer;       /* current span/point/line/triangle buffer */
 138
 139    XMesaDisplay *display;       /* == xm_visual->display */
 140    GLboolean swapbytes;         /* Host byte order != display byte order? */
 141    GLboolean direct;            /* Direct rendering context? */
 142
 143    enum pixel_format pixelformat;
 144
 145    GLubyte clearcolor[4];               /* current clearing color */
 146    unsigned long clearpixel;            /* current clearing pixel value */
 147 };
 148
 149
 150 /**
 151  * Types of X/GLX drawables we might render into.
 152  */
 153 typedef enum {
 154    WINDOW,          /* An X window */
 155    GLXWINDOW,       /* GLX window */
 156    PIXMAP,          /* GLX pixmap */
 157    PBUFFER          /* GLX Pbuffer */
 158 } BufferType;
 159
 160
 161 /** Values for db_mode: */
 162 /*@{*/
 163 #define BACK_PIXMAP     1
 164 #define BACK_XIMAGE     2
 165 /*@}*/
 166
 167
 168 /**
 169  * An xmesa_renderbuffer represents the back or front color buffer.
 170  * For the front color buffer:
 171  *    <drawable> is the X window
 172  * For the back color buffer:
 173  *    Either <ximage> or <pixmap> will be used, never both.
 174  * In any case, <drawable> always equals <pixmap>.
 175  * For stand-alone Mesa, we could merge <drawable> and <pixmap> into one
 176  * field.  We don't do that for the server-side GLcore module because
 177  * pixmaps and drawables are different and we'd need a bunch of casts.
 178  */
 179 struct xmesa_renderbuffer
 180 {
 181    struct gl_renderbuffer Base;  /* Base class */
 182
 183    XMesaBuffer Parent;  /**< The XMesaBuffer this renderbuffer belongs to */
 184    XMesaDrawable drawable;      /* Usually the X window ID */
 185    XMesaPixmap pixmap;  /* Back color buffer */
 186    XMesaImage *ximage;  /* The back buffer, if not using a Pixmap */
 187
 188    GLubyte *origin1;    /* used for PIXEL_ADDR1 macro */
 189    GLint width1;
 190    GLushort *origin2;   /* used for PIXEL_ADDR2 macro */
 191    GLint width2;
 192    GLubyte *origin3;    /* used for PIXEL_ADDR3 macro */
 193    GLint width3;
 194    GLuint *origin4;     /* used for PIXEL_ADDR4 macro */
 195    GLint width4;
 196
 197    GLint bottom;        /* used for FLIP macro, equals height - 1 */
 198
 199    ClearFunc clearFunc;
 200 };
 201
 202
 203 /**
 204  * Framebuffer information, derived from.
 205  * Basically corresponds to a GLXDrawable.
 206  */
 207 struct xmesa_buffer {
 208    GLframebuffer mesa_buffer;   /* depth, stencil, accum, etc buffers */
 209                                 /* This MUST BE FIRST! */
 210    GLboolean wasCurrent;        /* was ever the current buffer? */
 211    XMesaVisual xm_visual;       /* the X/Mesa visual */
 212
 213    XMesaDisplay *display;
 214    BufferType type;             /* window, pixmap, pbuffer or glxwindow */
 215
 216    struct xmesa_renderbuffer *frontxrb; /* front color renderbuffer */
 217    struct xmesa_renderbuffer *backxrb;  /* back color renderbuffer */
 218
 219    XMesaColormap cmap;          /* the X colormap */
 220
 221    unsigned long selectedEvents;/* for pbuffers only */
 222
 223    GLint db_mode;               /* 0 = single buffered */
 224                                 /* BACK_PIXMAP = use Pixmap for back buffer */
 225                                 /* BACK_XIMAGE = use XImage for back buffer */
 226
 227    GLuint shm;                  /* X Shared Memory extension status:    */
 228                                 /*    0 = not available                 */
 229                                 /*    1 = XImage support available      */
 230                                 /*    2 = Pixmap support available too  */
 231 #if defined(USE_XSHM) && !defined(XFree86Server)
 232    XShmSegmentInfo shminfo;
 233 #endif
 234
 235    XMesaImage *rowimage;        /* Used for optimized span writing */
 236    XMesaPixmap stipple_pixmap;  /* For polygon stippling */
 237    XMesaGC stipple_gc;          /* For polygon stippling */
 238
 239    XMesaGC gc;                  /* scratch GC for span, line, tri drawing */
 240    XMesaGC cleargc;             /* GC for clearing the color buffer */
 241    XMesaGC swapgc;              /* GC for swapping the color buffers */
 242
 243    /* The following are here instead of in the XMesaVisual
 244     * because they depend on the window's colormap.
 245     */
 246
 247    /* For PF_DITHER, PF_LOOKUP, PF_GRAYSCALE */
 248    unsigned long color_table[576];      /* RGB -> pixel value */
 249
 250    /* For PF_DITHER, PF_LOOKUP, PF_GRAYSCALE */
 251    GLubyte pixel_to_r[65536];           /* pixel value -> red */
 252    GLubyte pixel_to_g[65536];           /* pixel value -> green */
 253    GLubyte pixel_to_b[65536];           /* pixel value -> blue */
 254
 255    /* Used to do XAllocColor/XFreeColors accounting: */
 256    int num_alloced;
 257 #if defined(XFree86Server)
 258    Pixel alloced_colors[256];
 259 #else
 260    unsigned long alloced_colors[256];
 261 #endif
 262
 263 #if defined( FX )
 264    /* For 3Dfx Glide only */
 265    GLboolean FXisHackUsable;    /* Can we render into window? */
 266    GLboolean FXwindowHack;      /* Are we rendering into a window? */
 267    fxMesaContext FXctx;
 268 #endif
 269
 270    struct xmesa_buffer *Next;   /* Linked list pointer: */
 271 };
 272
 273
 274 /**
 275  * If pixelformat==PF_TRUECOLOR:
 276  */
 277 #define PACK_TRUECOLOR( PIXEL, R, G, B )        \
 278    PIXEL = xmesa->xm_visual->RtoPixel[R]        \
 279          | xmesa->xm_visual->GtoPixel[G]        \
 280          | xmesa->xm_visual->BtoPixel[B];       \
 281
 282
 283 /**
 284  * If pixelformat==PF_TRUEDITHER:
 285  */
 286 #define PACK_TRUEDITHER( PIXEL, X, Y, R, G, B )                 \
 287 {                                                               \
 288    int d = xmesa->xm_visual->Kernel[((X)&3) | (((Y)&3)<<2)];    \
 289    PIXEL = xmesa->xm_visual->RtoPixel[(R)+d]                    \
 290          | xmesa->xm_visual->GtoPixel[(G)+d]                    \
 291          | xmesa->xm_visual->BtoPixel[(B)+d];                   \
 292 }
 293
 294
 295
 296 /**
 297  * If pixelformat==PF_8A8B8G8R:
 298  */
 299 #define PACK_8A8B8G8R( R, G, B, A )     \
 300         ( ((A) << 24) | ((B) << 16) | ((G) << 8) | (R) )
 301
 302
 303 /**
 304  * Like PACK_8A8B8G8R() but don't use alpha.  This is usually an acceptable
 305  * shortcut.
 306  */
 307 #define PACK_8B8G8R( R, G, B )   ( ((B) << 16) | ((G) << 8) | (R) )
 308
 309
 310
 311 /**
 312  * If pixelformat==PF_8R8G8B:
 313  */
 314 #define PACK_8R8G8B( R, G, B)    ( ((R) << 16) | ((G) << 8) | (B) )
 315
 316
 317 /**
 318  * If pixelformat==PF_5R6G5B:
 319  */
 320 #define PACK_5R6G5B( R, G, B)    ( (((R) & 0xf8) << 8) | (((G) & 0xfc) << 3) | ((B) >> 3) )
 321
 322
 323 /**
 324  * If pixelformat==PF_8A8R8G8B:
 325  */
 326 #define PACK_8A8R8G8B( R, G, B, A )     \
 327         ( ((A) << 24) | ((R) << 16) | ((G) << 8) | (B) )
 328
 329
 330
 331 /**
 332  * If pixelformat==PF_DITHER:
 333  *
 334  * Improved 8-bit RGB dithering code contributed by Bob Mercier
 335  * (mercier@hollywood.cinenet.net).  Thanks Bob!
 336  */
 337 #ifdef DITHER666
 338 # define DITH_R   6
 339 # define DITH_G   6
 340 # define DITH_B   6
 341 # define DITH_MIX(r,g,b)  (((r) * DITH_G + (g)) * DITH_B + (b))
 342 #else
 343 # define DITH_R 5
 344 # define DITH_G 9
 345 # define DITH_B 5
 346 # define DITH_MIX(r,g,b)  (((g) << 6) | ((b) << 3) | (r))
 347 #endif
 348 #define DITH_DX 4
 349 #define DITH_DY 4
 350 #define DITH_N  (DITH_DX * DITH_DY)
 351
 352 #define _dither(C, c, d)   (((unsigned)((DITH_N * (C - 1) + 1) * c + d)) >> 12)
 353
 354 #define MAXC    256
 355 extern const int xmesa_kernel8[DITH_DY * DITH_DX];
 356
 357 /* Dither for random X,Y */
 358 #define DITHER_SETUP                                            \
 359         int __d;                                                \
 360         unsigned long *ctable = XMESA_BUFFER(ctx->DrawBuffer)->color_table;
 361
 362 #define DITHER( X, Y, R, G, B )                         \
 363         (__d = xmesa_kernel8[(((Y)&3)<<2) | ((X)&3)],   \
 364          ctable[DITH_MIX(_dither(DITH_R, (R), __d),     \
 365                          _dither(DITH_G, (G), __d),     \
 366                          _dither(DITH_B, (B), __d))])
 367
 368 /* Dither for random X, fixed Y */
 369 #define XDITHER_SETUP(Y)                                        \
 370         int __d;                                                \
 371         unsigned long *ctable = XMESA_BUFFER(ctx->DrawBuffer)->color_table;     \
 372         const int *kernel = &xmesa_kernel8[ ((Y)&3) << 2 ];
 373
 374 #define XDITHER( X, R, G, B )                           \
 375         (__d = kernel[(X)&3],                           \
 376         ctable[DITH_MIX(_dither(DITH_R, (R), __d),      \
 377                         _dither(DITH_G, (G), __d),      \
 378                         _dither(DITH_B, (B), __d))])
 379
 380
 381
 382 /*
 383  * Dithering for flat-shaded triangles.  Precompute all 16 possible
 384  * pixel values given the triangle's RGB color.  Contributed by Martin Shenk.
 385  */
 386 #define FLAT_DITHER_SETUP( R, G, B )                                    \
 387         GLushort ditherValues[16];                                      \
 388         {                                                               \
 389            unsigned long *ctable = XMESA_BUFFER(ctx->DrawBuffer)->color_table;  \
 390            int msdr = (DITH_N*((DITH_R)-1)+1) * (R);                    \
 391            int msdg = (DITH_N*((DITH_G)-1)+1) * (G);                    \
 392            int msdb = (DITH_N*((DITH_B)-1)+1) * (B);                    \
 393            int i;                                                       \
 394            for (i=0;i<16;i++) {                                         \
 395               int k = xmesa_kernel8[i];                                 \
 396               int j = DITH_MIX( (msdr+k)>>12, (msdg+k)>>12, (msdb+k)>>12 );\
 397               ditherValues[i] = (GLushort) ctable[j];                   \
 398            }                                                            \
 399         }
 400
 401 #define FLAT_DITHER_ROW_SETUP(Y)                                        \
 402         GLushort *ditherRow = ditherValues + ( ((Y)&3) << 2);
 403
 404 #define FLAT_DITHER(X)  ditherRow[(X)&3]
 405
 406
 407
 408 /**
 409  * If pixelformat==PF_LOOKUP:
 410  */
 411 #define _dither_lookup(C, c)   (((unsigned)((DITH_N * (C - 1) + 1) * c)) >> 12)
 412
 413 #define LOOKUP_SETUP                                            \
 414         unsigned long *ctable = XMESA_BUFFER(ctx->DrawBuffer)->color_table
 415
 416 #define LOOKUP( R, G, B )                               \
 417         ctable[DITH_MIX(_dither_lookup(DITH_R, (R)),    \
 418                         _dither_lookup(DITH_G, (G)),    \
 419                         _dither_lookup(DITH_B, (B)))]
 420
 421
 422 /**
 423  * If pixelformat==PF_HPCR:
 424  *
 425  *      HP Color Recovery dithering               (ad@lms.be 30/08/95)
 426  *      HP has on it's 8-bit 700-series computers, a feature called
 427  *      'Color Recovery'.  This allows near 24-bit output (so they say).
 428  *      It is enabled by selecting the 8-bit  TrueColor  visual AND
 429  *      corresponding  colormap (see tkInitWindow) AND doing some special
 430  *      dither.
 431  */
 432 extern const short xmesa_HPCR_DRGB[3][2][16];
 433
 434 #define DITHER_HPCR( X, Y, R, G, B )                                       \
 435   ( ((xmesa->xm_visual->hpcr_rgbTbl[0][R] + xmesa_HPCR_DRGB[0][(Y)&1][(X)&15]) & 0xE0)     \
 436   |(((xmesa->xm_visual->hpcr_rgbTbl[1][G] + xmesa_HPCR_DRGB[1][(Y)&1][(X)&15]) & 0xE0)>>3) \
 437   | ((xmesa->xm_visual->hpcr_rgbTbl[2][B] + xmesa_HPCR_DRGB[2][(Y)&1][(X)&15])>>6)         \
 438   )
 439
 440
 441
 442 /**
 443  * If pixelformat==PF_1BIT:
 444  */
 445 extern const int xmesa_kernel1[16];
 446
 447 #define SETUP_1BIT  int bitFlip = xmesa->xm_visual->bitFlip
 448 #define DITHER_1BIT( X, Y, R, G, B )    \
 449         (( ((int)(R)+(int)(G)+(int)(B)) > xmesa_kernel1[(((Y)&3) << 2) | ((X)&3)] ) ^ bitFlip)
 450
 451
 452
 453 /**
 454  * If pixelformat==PF_GRAYSCALE:
 455  */
 456 #define GRAY_RGB( R, G, B )   XMESA_BUFFER(ctx->DrawBuffer)->color_table[((R) + (G) + (B))/3]
 457
 458
 459
 460 /**
 461  * Converts a GL window Y coord to an X window Y coord:
 462  */
 463 #define YFLIP(XRB, Y)  ((XRB)->bottom - (Y))
 464
 465
 466 /**
 467  * Return the address of a 1, 2 or 4-byte pixel in the buffer's XImage:
 468  * X==0 is left, Y==0 is bottom.
 469  */
 470 #define PIXEL_ADDR1(XRB, X, Y)  \
 471    ( (XRB)->origin1 - (Y) * (XRB)->width1 + (X) )
 472
 473 #define PIXEL_ADDR2(XRB, X, Y)  \
 474    ( (XRB)->origin2 - (Y) * (XRB)->width2 + (X) )
 475
 476 #define PIXEL_ADDR3(XRB, X, Y)  \
 477    ( (bgr_t *) ( (XRB)->origin3 - (Y) * (XRB)->width3 + 3 * (X) ))
 478
 479 #define PIXEL_ADDR4(XRB, X, Y)  \
 480    ( (XRB)->origin4 - (Y) * (XRB)->width4 + (X) )
 481
 482
 483
 484 /*
 485  * External functions:
 486  */
 487
 488 extern struct xmesa_renderbuffer *
 489 xmesa_new_renderbuffer(GLcontext *ctx, GLuint name, const GLvisual *visual,
 490                        GLboolean backBuffer);
 491
 492 extern unsigned long
 493 xmesa_color_to_pixel( GLcontext *ctx,
 494                       GLubyte r, GLubyte g, GLubyte b, GLubyte a,
 495                       GLuint pixelFormat );
 496
 497 extern void
 498 xmesa_get_window_size(XMesaDisplay *dpy, XMesaBuffer b,
 499                       GLuint *width, GLuint *height);
 500
 501 extern void
 502 xmesa_check_and_update_buffer_size(XMesaContext xmctx, XMesaBuffer drawBuffer);
 503
 504 extern void
 505 xmesa_init_driver_functions( XMesaVisual xmvisual,
 506                              struct dd_function_table *driver );
 507
 508 extern void
 509 xmesa_update_state( GLcontext *ctx, GLbitfield new_state );
 510
 511 extern void
 512 xmesa_set_renderbuffer_funcs(struct xmesa_renderbuffer *xrb,
 513                              enum pixel_format pixelformat, GLint depth);
 514
 515 extern void
 516 xmesa_destroy_buffers_on_display(XMesaDisplay *dpy);
 517
 518
 519 /**
 520  * Using a function instead of an ordinary cast is safer.
 521  */
 522 static INLINE struct xmesa_renderbuffer *
 523 xmesa_renderbuffer(struct gl_renderbuffer *rb)
 524 {
 525    return (struct xmesa_renderbuffer *) rb;
 526 }
 527
 528
 529 /**
 530  * Return pointer to XMesaContext corresponding to a Mesa GLcontext.
 531  * Since we're using structure containment, it's just a cast!.
 532  * XXX should use inlined function for better type safety.
 533  */
 534 static INLINE XMesaContext
 535 XMESA_CONTEXT(GLcontext *ctx)
 536 {
 537    return (XMesaContext) ctx;
 538 }
 539
 540
 541 /**
 542  * Return pointer to XMesaBuffer corresponding to a Mesa GLframebuffer.
 543  * Since we're using structure containment, it's just a cast!.
 544  * XXX should use inlined function for better type safety.
 545  */
 546 static INLINE XMesaBuffer
 547 XMESA_BUFFER(GLframebuffer *b)
 548 {
 549    return (XMesaBuffer) b;
 550 }
 551
 552
 553 /* Plugged into the software rasterizer.  Try to use internal
 554  * swrast-style point, line and triangle functions.
 555  */
 556 extern void xmesa_choose_point( GLcontext *ctx );
 557 extern void xmesa_choose_line( GLcontext *ctx );
 558 extern void xmesa_choose_triangle( GLcontext *ctx );
 559
 560
 561 extern void xmesa_register_swrast_functions( GLcontext *ctx );
 562
 563
 564
 565 /* XXX this is a hack to implement shared display lists with 3Dfx */
 566 extern XMesaBuffer XMesaCreateWindowBuffer2( XMesaVisual v,
 567                                              XMesaWindow w,
 568                                              XMesaContext c );
 569
 570 /*
 571  * These are the extra routines required for integration with XFree86.
 572  * None of these routines should be user visible. -KEM
 573  */
 574 extern void XMesaSetVisualDisplay( XMesaDisplay *dpy, XMesaVisual v );
 575 extern GLboolean XMesaForceCurrent(XMesaContext c);
 576 extern GLboolean XMesaLoseCurrent(XMesaContext c);
 577 extern void XMesaReset( void );
 578
 579
 580 #define ENABLE_EXT_texure_compression_s3tc 0 /* SW texture compression */
 581
 582 #ifdef XFree86Server
 583 #define ENABLE_EXT_timer_query 0
 584 #elif defined(__STDC_VERSION__) && __STDC_VERSION__ >= 199901L
 585 #define ENABLE_EXT_timer_query 1 /* should have 64-bit GLuint64EXT */
 586 #else
 587 #define ENABLE_EXT_timer_query 0 /* may not have 64-bit GLuint64EXT */
 588 #endif
 589
 590 #endif