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 extern XMesaBuffer XMesaBufferList;
  46
  47 /* for PF_8R8G8B24 pixel format */
  48 typedef struct {
  49    GLubyte b;
  50    GLubyte g;
  51    GLubyte r;
  52 } bgr_t;
  53
  54
  55 struct xmesa_renderbuffer;
  56
  57
  58 /* Function pointer for clearing color buffers */
  59 typedef void (*ClearFunc)( GLcontext *ctx, struct xmesa_renderbuffer *xrb,
  60                            GLint x, GLint y, GLint width, GLint height );
  61
  62
  63
  64
  65 /** Framebuffer pixel formats */
  66 enum pixel_format {
  67    PF_Index,            /**< Color Index mode */
  68    PF_Truecolor,        /**< TrueColor or DirectColor, any depth */
  69    PF_Dither_True,      /**< TrueColor with dithering */
  70    PF_8A8B8G8R,         /**< 32-bit TrueColor:  8-A, 8-B, 8-G, 8-R */
  71    PF_8R8G8B,           /**< 32-bit TrueColor:  8-R, 8-G, 8-B bits */
  72    PF_5R6G5B,           /**< 16-bit TrueColor:  5-R, 6-G, 5-B bits */
  73    PF_Dither,           /**< Color-mapped RGB with dither */
  74    PF_Lookup,           /**< Color-mapped RGB without dither */
  75    PF_HPCR,             /**< HP Color Recovery (ad@lms.be 30/08/95) */
  76    PF_1Bit,             /**< monochrome dithering of RGB */
  77    PF_Grayscale,        /**< Grayscale or StaticGray */
  78    PF_8R8G8B24,         /**< 24-bit TrueColor: 8-R, 8-G, 8-B bits */
  79    PF_Dither_5R6G5B,    /**< 16-bit dithered TrueColor: 5-R, 6-G, 5-B */
  80    PF_8A8R8G8B          /**< 32-bit TrueColor:  8-A, 8-R, 8-G, 8-B */
  81 };
  82
  83
  84 /**
  85  * Visual inforation, derived from GLvisual.
  86  * Basically corresponds to an XVisualInfo.
  87  */
  88 struct xmesa_visual {
  89    GLvisual mesa_visual;        /* Device independent visual parameters */
  90    XMesaDisplay *display;       /* The X11 display */
  91 #ifdef XFree86Server
  92    GLint ColormapEntries;
  93    GLint nplanes;
  94 #else
  95    XMesaVisualInfo visinfo;     /* X's visual info (pointer to private copy) */
  96    XVisualInfo *vishandle;      /* Only used in fakeglx.c */
  97 #endif
  98    GLint BitsPerPixel;          /* True bits per pixel for XImages */
  99
 100    GLboolean ximage_flag;       /* Use XImage for back buffer (not pixmap)? */
 101
 102    enum pixel_format dithered_pf;  /* Pixel format when dithering */
 103    enum pixel_format undithered_pf;/* Pixel format when not dithering */
 104
 105    GLfloat RedGamma;            /* Gamma values, 1.0 is default */
 106    GLfloat GreenGamma;
 107    GLfloat BlueGamma;
 108
 109    /* For PF_TRUECOLOR */
 110    GLint rshift, gshift, bshift;/* Pixel color component shifts */
 111    GLubyte Kernel[16];          /* Dither kernel */
 112    unsigned long RtoPixel[512]; /* RGB to pixel conversion */
 113    unsigned long GtoPixel[512];
 114    unsigned long BtoPixel[512];
 115    GLubyte PixelToR[256];       /* Pixel to RGB conversion */
 116    GLubyte PixelToG[256];
 117    GLubyte PixelToB[256];
 118
 119    /* For PF_HPCR */
 120    short       hpcr_rgbTbl[3][256];
 121    GLboolean   hpcr_clear_flag;
 122    GLubyte     hpcr_clear_ximage_pattern[2][16];
 123    XMesaImage *hpcr_clear_ximage;
 124    XMesaPixmap hpcr_clear_pixmap;
 125
 126    /* For PF_1BIT */
 127    int bitFlip;
 128 };
 129
 130
 131 /**
 132  * Context info, dDerived from GLcontext.
 133  * Basically corresponds to a GLXContext.
 134  */
 135 struct xmesa_context {
 136    GLcontext mesa;              /* the core library context (containment) */
 137    XMesaVisual xm_visual;       /* Describes the buffers */
 138    XMesaBuffer xm_buffer;       /* current span/point/line/triangle buffer */
 139
 140    XMesaDisplay *display;       /* == xm_visual->display */
 141    GLboolean swapbytes;         /* Host byte order != display byte order? */
 142    GLboolean direct;            /* Direct rendering context? */
 143
 144    enum pixel_format pixelformat;
 145
 146    GLubyte clearcolor[4];               /* current clearing color */
 147    unsigned long clearpixel;            /* current clearing pixel value */
 148 };
 149
 150
 151 /**
 152  * Types of X/GLX drawables we might render into.
 153  */
 154 typedef enum {
 155    WINDOW,          /* An X window */
 156    GLXWINDOW,       /* GLX window */
 157    PIXMAP,          /* GLX pixmap */
 158    PBUFFER          /* GLX Pbuffer */
 159 } BufferType;
 160
 161
 162 /** Values for db_mode: */
 163 /*@{*/
 164 #define BACK_PIXMAP     1
 165 #define BACK_XIMAGE     2
 166 /*@}*/
 167
 168
 169 /**
 170  * An xmesa_renderbuffer represents the back or front color buffer.
 171  * For the front color buffer:
 172  *    <drawable> is the X window
 173  * For the back color buffer:
 174  *    Either <ximage> or <pixmap> will be used, never both.
 175  * In any case, <drawable> always equals <pixmap>.
 176  * For stand-alone Mesa, we could merge <drawable> and <pixmap> into one
 177  * field.  We don't do that for the server-side GLcore module because
 178  * pixmaps and drawables are different and we'd need a bunch of casts.
 179  */
 180 struct xmesa_renderbuffer
 181 {
 182    struct gl_renderbuffer Base;  /* Base class */
 183
 184    XMesaBuffer Parent;  /**< The XMesaBuffer this renderbuffer belongs to */
 185    XMesaDrawable drawable;      /* Usually the X window ID */
 186    XMesaPixmap pixmap;  /* Back color buffer */
 187    XMesaImage *ximage;  /* The back buffer, if not using a Pixmap */
 188
 189    GLubyte *origin1;    /* used for PIXEL_ADDR1 macro */
 190    GLint width1;
 191    GLushort *origin2;   /* used for PIXEL_ADDR2 macro */
 192    GLint width2;
 193    GLubyte *origin3;    /* used for PIXEL_ADDR3 macro */
 194    GLint width3;
 195    GLuint *origin4;     /* used for PIXEL_ADDR4 macro */
 196    GLint width4;
 197
 198    GLint bottom;        /* used for FLIP macro, equals height - 1 */
 199
 200    ClearFunc clearFunc;
 201 };
 202
 203
 204 /**
 205  * Framebuffer information, derived from.
 206  * Basically corresponds to a GLXDrawable.
 207  */
 208 struct xmesa_buffer {
 209    GLframebuffer mesa_buffer;   /* depth, stencil, accum, etc buffers */
 210                                 /* This MUST BE FIRST! */
 211    GLboolean wasCurrent;        /* was ever the current buffer? */
 212    XMesaVisual xm_visual;       /* the X/Mesa visual */
 213
 214    XMesaDisplay *display;
 215    BufferType type;             /* window, pixmap, pbuffer or glxwindow */
 216
 217    struct xmesa_renderbuffer *frontxrb; /* front color renderbuffer */
 218    struct xmesa_renderbuffer *backxrb;  /* back color renderbuffer */
 219
 220    XMesaColormap cmap;          /* the X colormap */
 221
 222    unsigned long selectedEvents;/* for pbuffers only */
 223
 224    GLint db_mode;               /* 0 = single buffered */
 225                                 /* BACK_PIXMAP = use Pixmap for back buffer */
 226                                 /* BACK_XIMAGE = use XImage for back buffer */
 227    GLboolean swAlpha;
 228
 229    GLuint shm;                  /* X Shared Memory extension status:    */
 230                                 /*    0 = not available                 */
 231                                 /*    1 = XImage support available      */
 232                                 /*    2 = Pixmap support available too  */
 233 #if defined(USE_XSHM) && !defined(XFree86Server)
 234    XShmSegmentInfo shminfo;
 235 #endif
 236
 237    XMesaImage *rowimage;        /* Used for optimized span writing */
 238    XMesaPixmap stipple_pixmap;  /* For polygon stippling */
 239    XMesaGC stipple_gc;          /* For polygon stippling */
 240
 241    XMesaGC gc;                  /* scratch GC for span, line, tri drawing */
 242    XMesaGC cleargc;             /* GC for clearing the color buffer */
 243    XMesaGC swapgc;              /* GC for swapping the color buffers */
 244
 245    /* The following are here instead of in the XMesaVisual
 246     * because they depend on the window's colormap.
 247     */
 248
 249    /* For PF_DITHER, PF_LOOKUP, PF_GRAYSCALE */
 250    unsigned long color_table[576];      /* RGB -> pixel value */
 251
 252    /* For PF_DITHER, PF_LOOKUP, PF_GRAYSCALE */
 253    GLubyte pixel_to_r[65536];           /* pixel value -> red */
 254    GLubyte pixel_to_g[65536];           /* pixel value -> green */
 255    GLubyte pixel_to_b[65536];           /* pixel value -> blue */
 256
 257    /* Used to do XAllocColor/XFreeColors accounting: */
 258    int num_alloced;
 259 #if defined(XFree86Server)
 260    Pixel alloced_colors[256];
 261 #else
 262    unsigned long alloced_colors[256];
 263 #endif
 264
 265 #if defined( FX )
 266    /* For 3Dfx Glide only */
 267    GLboolean FXisHackUsable;    /* Can we render into window? */
 268    GLboolean FXwindowHack;      /* Are we rendering into a window? */
 269    fxMesaContext FXctx;
 270 #endif
 271
 272    struct xmesa_buffer *Next;   /* Linked list pointer: */
 273 };
 274
 275
 276 /**
 277  * If pixelformat==PF_TRUECOLOR:
 278  */
 279 #define PACK_TRUECOLOR( PIXEL, R, G, B )        \
 280    PIXEL = xmesa->xm_visual->RtoPixel[R]        \
 281          | xmesa->xm_visual->GtoPixel[G]        \
 282          | xmesa->xm_visual->BtoPixel[B];       \
 283
 284
 285 /**
 286  * If pixelformat==PF_TRUEDITHER:
 287  */
 288 #define PACK_TRUEDITHER( PIXEL, X, Y, R, G, B )                 \
 289 {                                                               \
 290    int d = xmesa->xm_visual->Kernel[((X)&3) | (((Y)&3)<<2)];    \
 291    PIXEL = xmesa->xm_visual->RtoPixel[(R)+d]                    \
 292          | xmesa->xm_visual->GtoPixel[(G)+d]                    \
 293          | xmesa->xm_visual->BtoPixel[(B)+d];                   \
 294 }
 295
 296
 297
 298 /**
 299  * If pixelformat==PF_8A8B8G8R:
 300  */
 301 #define PACK_8A8B8G8R( R, G, B, A )     \
 302         ( ((A) << 24) | ((B) << 16) | ((G) << 8) | (R) )
 303
 304
 305 /**
 306  * Like PACK_8A8B8G8R() but don't use alpha.  This is usually an acceptable
 307  * shortcut.
 308  */
 309 #define PACK_8B8G8R( R, G, B )   ( ((B) << 16) | ((G) << 8) | (R) )
 310
 311
 312
 313 /**
 314  * If pixelformat==PF_8R8G8B:
 315  */
 316 #define PACK_8R8G8B( R, G, B)    ( ((R) << 16) | ((G) << 8) | (B) )
 317
 318
 319 /**
 320  * If pixelformat==PF_5R6G5B:
 321  */
 322 #define PACK_5R6G5B( R, G, B)    ( (((R) & 0xf8) << 8) | (((G) & 0xfc) << 3) | ((B) >> 3) )
 323
 324
 325 /**
 326  * If pixelformat==PF_8A8R8G8B:
 327  */
 328 #define PACK_8A8R8G8B( R, G, B, A )     \
 329         ( ((A) << 24) | ((R) << 16) | ((G) << 8) | (B) )
 330
 331
 332
 333 /**
 334  * If pixelformat==PF_DITHER:
 335  *
 336  * Improved 8-bit RGB dithering code contributed by Bob Mercier
 337  * (mercier@hollywood.cinenet.net).  Thanks Bob!
 338  */
 339 #ifdef DITHER666
 340 # define DITH_R   6
 341 # define DITH_G   6
 342 # define DITH_B   6
 343 # define DITH_MIX(r,g,b)  (((r) * DITH_G + (g)) * DITH_B + (b))
 344 #else
 345 # define DITH_R 5
 346 # define DITH_G 9
 347 # define DITH_B 5
 348 # define DITH_MIX(r,g,b)  (((g) << 6) | ((b) << 3) | (r))
 349 #endif
 350 #define DITH_DX 4
 351 #define DITH_DY 4
 352 #define DITH_N  (DITH_DX * DITH_DY)
 353
 354 #define _dither(C, c, d)   (((unsigned)((DITH_N * (C - 1) + 1) * c + d)) >> 12)
 355
 356 #define MAXC    256
 357 extern const int xmesa_kernel8[DITH_DY * DITH_DX];
 358
 359 /* Dither for random X,Y */
 360 #define DITHER_SETUP                                            \
 361         int __d;                                                \
 362         unsigned long *ctable = XMESA_BUFFER(ctx->DrawBuffer)->color_table;
 363
 364 #define DITHER( X, Y, R, G, B )                         \
 365         (__d = xmesa_kernel8[(((Y)&3)<<2) | ((X)&3)],   \
 366          ctable[DITH_MIX(_dither(DITH_R, (R), __d),     \
 367                          _dither(DITH_G, (G), __d),     \
 368                          _dither(DITH_B, (B), __d))])
 369
 370 /* Dither for random X, fixed Y */
 371 #define XDITHER_SETUP(Y)                                        \
 372         int __d;                                                \
 373         unsigned long *ctable = XMESA_BUFFER(ctx->DrawBuffer)->color_table;     \
 374         const int *kernel = &xmesa_kernel8[ ((Y)&3) << 2 ];
 375
 376 #define XDITHER( X, R, G, B )                           \
 377         (__d = kernel[(X)&3],                           \
 378         ctable[DITH_MIX(_dither(DITH_R, (R), __d),      \
 379                         _dither(DITH_G, (G), __d),      \
 380                         _dither(DITH_B, (B), __d))])
 381
 382
 383
 384 /*
 385  * Dithering for flat-shaded triangles.  Precompute all 16 possible
 386  * pixel values given the triangle's RGB color.  Contributed by Martin Shenk.
 387  */
 388 #define FLAT_DITHER_SETUP( R, G, B )                                    \
 389         GLushort ditherValues[16];                                      \
 390         {                                                               \
 391            unsigned long *ctable = XMESA_BUFFER(ctx->DrawBuffer)->color_table;  \
 392            int msdr = (DITH_N*((DITH_R)-1)+1) * (R);                    \
 393            int msdg = (DITH_N*((DITH_G)-1)+1) * (G);                    \
 394            int msdb = (DITH_N*((DITH_B)-1)+1) * (B);                    \
 395            int i;                                                       \
 396            for (i=0;i<16;i++) {                                         \
 397               int k = xmesa_kernel8[i];                                 \
 398               int j = DITH_MIX( (msdr+k)>>12, (msdg+k)>>12, (msdb+k)>>12 );\
 399               ditherValues[i] = (GLushort) ctable[j];                   \
 400            }                                                            \
 401         }
 402
 403 #define FLAT_DITHER_ROW_SETUP(Y)                                        \
 404         GLushort *ditherRow = ditherValues + ( ((Y)&3) << 2);
 405
 406 #define FLAT_DITHER(X)  ditherRow[(X)&3]
 407
 408
 409
 410 /**
 411  * If pixelformat==PF_LOOKUP:
 412  */
 413 #define _dither_lookup(C, c)   (((unsigned)((DITH_N * (C - 1) + 1) * c)) >> 12)
 414
 415 #define LOOKUP_SETUP                                            \
 416         unsigned long *ctable = XMESA_BUFFER(ctx->DrawBuffer)->color_table
 417
 418 #define LOOKUP( R, G, B )                               \
 419         ctable[DITH_MIX(_dither_lookup(DITH_R, (R)),    \
 420                         _dither_lookup(DITH_G, (G)),    \
 421                         _dither_lookup(DITH_B, (B)))]
 422
 423
 424 /**
 425  * If pixelformat==PF_HPCR:
 426  *
 427  *      HP Color Recovery dithering               (ad@lms.be 30/08/95)
 428  *      HP has on it's 8-bit 700-series computers, a feature called
 429  *      'Color Recovery'.  This allows near 24-bit output (so they say).
 430  *      It is enabled by selecting the 8-bit  TrueColor  visual AND
 431  *      corresponding  colormap (see tkInitWindow) AND doing some special
 432  *      dither.
 433  */
 434 extern const short xmesa_HPCR_DRGB[3][2][16];
 435
 436 #define DITHER_HPCR( X, Y, R, G, B )                                       \
 437   ( ((xmesa->xm_visual->hpcr_rgbTbl[0][R] + xmesa_HPCR_DRGB[0][(Y)&1][(X)&15]) & 0xE0)     \
 438   |(((xmesa->xm_visual->hpcr_rgbTbl[1][G] + xmesa_HPCR_DRGB[1][(Y)&1][(X)&15]) & 0xE0)>>3) \
 439   | ((xmesa->xm_visual->hpcr_rgbTbl[2][B] + xmesa_HPCR_DRGB[2][(Y)&1][(X)&15])>>6)         \
 440   )
 441
 442
 443
 444 /**
 445  * If pixelformat==PF_1BIT:
 446  */
 447 extern const int xmesa_kernel1[16];
 448
 449 #define SETUP_1BIT  int bitFlip = xmesa->xm_visual->bitFlip
 450 #define DITHER_1BIT( X, Y, R, G, B )    \
 451         (( ((int)(R)+(int)(G)+(int)(B)) > xmesa_kernel1[(((Y)&3) << 2) | ((X)&3)] ) ^ bitFlip)
 452
 453
 454
 455 /**
 456  * If pixelformat==PF_GRAYSCALE:
 457  */
 458 #define GRAY_RGB( R, G, B )   XMESA_BUFFER(ctx->DrawBuffer)->color_table[((R) + (G) + (B))/3]
 459
 460
 461
 462 /**
 463  * Converts a GL window Y coord to an X window Y coord:
 464  */
 465 #define YFLIP(XRB, Y)  ((XRB)->bottom - (Y))
 466
 467
 468 /**
 469  * Return the address of a 1, 2 or 4-byte pixel in the buffer's XImage:
 470  * X==0 is left, Y==0 is bottom.
 471  */
 472 #define PIXEL_ADDR1(XRB, X, Y)  \
 473    ( (XRB)->origin1 - (Y) * (XRB)->width1 + (X) )
 474
 475 #define PIXEL_ADDR2(XRB, X, Y)  \
 476    ( (XRB)->origin2 - (Y) * (XRB)->width2 + (X) )
 477
 478 #define PIXEL_ADDR3(XRB, X, Y)  \
 479    ( (bgr_t *) ( (XRB)->origin3 - (Y) * (XRB)->width3 + 3 * (X) ))
 480
 481 #define PIXEL_ADDR4(XRB, X, Y)  \
 482    ( (XRB)->origin4 - (Y) * (XRB)->width4 + (X) )
 483
 484
 485
 486 /*
 487  * External functions:
 488  */
 489
 490 extern struct xmesa_renderbuffer *
 491 xmesa_new_renderbuffer(GLcontext *ctx, GLuint name, const GLvisual *visual,
 492                        GLboolean backBuffer);
 493
 494 extern void
 495 xmesa_delete_framebuffer(struct gl_framebuffer *fb);
 496
 497 extern XMesaBuffer
 498 xmesa_find_buffer(XMesaDisplay *dpy, XMesaColormap cmap, XMesaBuffer notThis);
 499
 500 extern unsigned long
 501 xmesa_color_to_pixel( GLcontext *ctx,
 502                       GLubyte r, GLubyte g, GLubyte b, GLubyte a,
 503                       GLuint pixelFormat );
 504
 505 extern void
 506 xmesa_get_window_size(XMesaDisplay *dpy, XMesaBuffer b,
 507                       GLuint *width, GLuint *height);
 508
 509 extern void
 510 xmesa_check_and_update_buffer_size(XMesaContext xmctx, XMesaBuffer drawBuffer);
 511
 512 extern void
 513 xmesa_init_driver_functions( XMesaVisual xmvisual,
 514                              struct dd_function_table *driver );
 515
 516 extern void
 517 xmesa_update_state( GLcontext *ctx, GLbitfield new_state );
 518
 519 extern void
 520 xmesa_set_renderbuffer_funcs(struct xmesa_renderbuffer *xrb,
 521                              enum pixel_format pixelformat, GLint depth);
 522
 523 extern void
 524 xmesa_destroy_buffers_on_display(XMesaDisplay *dpy);
 525
 526
 527 /**
 528  * Using a function instead of an ordinary cast is safer.
 529  */
 530 static INLINE struct xmesa_renderbuffer *
 531 xmesa_renderbuffer(struct gl_renderbuffer *rb)
 532 {
 533    return (struct xmesa_renderbuffer *) rb;
 534 }
 535
 536
 537 /**
 538  * Return pointer to XMesaContext corresponding to a Mesa GLcontext.
 539  * Since we're using structure containment, it's just a cast!.
 540  * XXX should use inlined function for better type safety.
 541  */
 542 static INLINE XMesaContext
 543 XMESA_CONTEXT(GLcontext *ctx)
 544 {
 545    return (XMesaContext) ctx;
 546 }
 547
 548
 549 /**
 550  * Return pointer to XMesaBuffer corresponding to a Mesa GLframebuffer.
 551  * Since we're using structure containment, it's just a cast!.
 552  * XXX should use inlined function for better type safety.
 553  */
 554 static INLINE XMesaBuffer
 555 XMESA_BUFFER(GLframebuffer *b)
 556 {
 557    return (XMesaBuffer) b;
 558 }
 559
 560
 561 /* Plugged into the software rasterizer.  Try to use internal
 562  * swrast-style point, line and triangle functions.
 563  */
 564 extern void xmesa_choose_point( GLcontext *ctx );
 565 extern void xmesa_choose_line( GLcontext *ctx );
 566 extern void xmesa_choose_triangle( GLcontext *ctx );
 567
 568
 569 extern void xmesa_register_swrast_functions( GLcontext *ctx );
 570
 571
 572
 573 /* XXX this is a hack to implement shared display lists with 3Dfx */
 574 extern XMesaBuffer XMesaCreateWindowBuffer2( XMesaVisual v,
 575                                              XMesaWindow w,
 576                                              XMesaContext c );
 577
 578 /*
 579  * These are the extra routines required for integration with XFree86.
 580  * None of these routines should be user visible. -KEM
 581  */
 582 extern void XMesaSetVisualDisplay( XMesaDisplay *dpy, XMesaVisual v );
 583 extern GLboolean XMesaForceCurrent(XMesaContext c);
 584 extern GLboolean XMesaLoseCurrent(XMesaContext c);
 585 extern void XMesaReset( void );
 586
 587
 588 #define ENABLE_EXT_texure_compression_s3tc 0 /* SW texture compression */
 589
 590 #ifdef XFree86Server
 591 #define ENABLE_EXT_timer_query 0
 592 #elif defined(__STDC_VERSION__) && __STDC_VERSION__ >= 199901L
 593 #define ENABLE_EXT_timer_query 1 /* should have 64-bit GLuint64EXT */
 594 #else
 595 #define ENABLE_EXT_timer_query 0 /* may not have 64-bit GLuint64EXT */
 596 #endif
 597
 598 #endif