src/mesa/drivers/dri/common/dri_util.h

   1 /* $XFree86: xc/lib/GL/dri/dri_util.h,v 1.1 2002/02/22 21:32:52 dawes Exp $ */
   2 /**
   3  * \file dri_util.h
   4  * DRI utility functions definitions.
   5  *
   6  * This module acts as glue between GLX and the actual hardware driver.  A DRI
   7  * driver doesn't really \e have to use any of this - it's optional.  But, some
   8  * useful stuff is done here that otherwise would have to be duplicated in most
   9  * drivers.
  10  *
  11  * Basically, these utility functions take care of some of the dirty details of
  12  * screen initialization, context creation, context binding, DRM setup, etc.
  13  *
  14  * These functions are compiled into each DRI driver so libGL.so knows nothing
  15  * about them.
  16  *
  17  * \sa dri_util.c.
  18  *
  19  * \author Kevin E. Martin <kevin@precisioninsight.com>
  20  * \author Brian Paul <brian@precisioninsight.com>
  21  */
  22
  23 /*
  24  * Copyright 1998-1999 Precision Insight, Inc., Cedar Park, Texas.
  25  * All Rights Reserved.
  26  *
  27  * Permission is hereby granted, free of charge, to any person obtaining a
  28  * copy of this software and associated documentation files (the
  29  * "Software"), to deal in the Software without restriction, including
  30  * without limitation the rights to use, copy, modify, merge, publish,
  31  * distribute, sub license, and/or sell copies of the Software, and to
  32  * permit persons to whom the Software is furnished to do so, subject to
  33  * the following conditions:
  34  *
  35  * The above copyright notice and this permission notice (including the
  36  * next paragraph) shall be included in all copies or substantial portions
  37  * of the Software.
  38  *
  39  * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS
  40  * OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF
  41  * MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND NON-INFRINGEMENT.
  42  * IN NO EVENT SHALL PRECISION INSIGHT AND/OR ITS SUPPLIERS BE LIABLE FOR
  43  * ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN ACTION OF CONTRACT,
  44  * TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN CONNECTION WITH THE
  45  * SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE.
  46  */
  47
  48
  49 #ifndef _DRI_UTIL_H_
  50 #define _DRI_UTIL_H_
  51
  52 #ifdef GLX_DIRECT_RENDERING
  53
  54 #define CAPI  /* XXX this should be globally defined somewhere */
  55
  56 #include <inttypes.h>
  57 #include "glxclient.h"           /* for GLXDrawable */
  58 /* temporary */
  59 /* typedef Bool ( * PFNGLXGETMSCRATEOMLPROC) (Display *dpy, GLXDrawable drawable, int32_t *numerator, int32_t *denominator); */
  60 #include "drm.h"             /* for drm_clip_rect_t */
  61 #include "sarea.h"               /* for XF86DRISAREAPtr */
  62 #include "GL/internal/glcore.h"  /* for __GLcontextModes */
  63
  64
  65 typedef struct __DRIdisplayPrivateRec  __DRIdisplayPrivate;
  66 typedef struct __DRIscreenPrivateRec   __DRIscreenPrivate;
  67 typedef struct __DRIcontextPrivateRec  __DRIcontextPrivate;
  68 typedef struct __DRIdrawablePrivateRec __DRIdrawablePrivate;
  69 typedef struct __DRIswapInfoRec        __DRIswapInfo;
  70
  71
  72 /**
  73  * Used by DRI_VALIDATE_DRAWABLE_INFO
  74  */
  75 #define DRI_VALIDATE_DRAWABLE_INFO_ONCE(pDrawPriv)              \
  76     do {                                                        \
  77         if (*(pDrawPriv->pStamp) != pDrawPriv->lastStamp) {     \
  78             __driUtilUpdateDrawableInfo(pDrawPriv);             \
  79         }                                                       \
  80     } while (0)
  81
  82
  83 /**
  84  * Utility macro to validate the drawable information.
  85  *
  86  * See __DRIdrawablePrivate::pStamp and __DRIdrawablePrivate::lastStamp.
  87  */
  88 #define DRI_VALIDATE_DRAWABLE_INFO(psp, pdp)                            \
  89 do {                                                                    \
  90     while (*(pdp->pStamp) != pdp->lastStamp) {                          \
  91         DRM_UNLOCK(psp->fd, &psp->pSAREA->lock,                         \
  92                    pdp->driContextPriv->hHWContext);                    \
  93                                                                         \
  94         DRM_SPINLOCK(&psp->pSAREA->drawable_lock, psp->drawLockID);     \
  95         DRI_VALIDATE_DRAWABLE_INFO_ONCE(pdp);                           \
  96         DRM_SPINUNLOCK(&psp->pSAREA->drawable_lock, psp->drawLockID);   \
  97                                                                         \
  98         DRM_LIGHT_LOCK(psp->fd, &psp->pSAREA->lock,                     \
  99                        pdp->driContextPriv->hHWContext);                \
 100     }                                                                   \
 101 } while (0)
 102
 103
 104 /**
 105  * Driver callback functions.
 106  *
 107  * Each DRI driver must have one of these structures with all the pointers set
 108  * to appropriate functions within the driver.
 109  *
 110  * When glXCreateContext() is called, for example, it'll call a helper function
 111  * dri_util.c which in turn will jump through the \a CreateContext pointer in
 112  * this structure.
 113  */
 114 struct __DriverAPIRec {
 115     /**
 116      * Driver initialization callback
 117      */
 118     GLboolean (*InitDriver)(__DRIscreenPrivate *driScrnPriv);
 119
 120     /**
 121      * Screen destruction callback
 122      */
 123     void (*DestroyScreen)(__DRIscreenPrivate *driScrnPriv);
 124
 125     /**
 126      * Context creation callback
 127      */
 128     GLboolean (*CreateContext)(const __GLcontextModes *glVis,
 129                                __DRIcontextPrivate *driContextPriv,
 130                                void *sharedContextPrivate);
 131
 132     /**
 133      * Context destruction callback
 134      */
 135     void (*DestroyContext)(__DRIcontextPrivate *driContextPriv);
 136
 137     /**
 138      * Buffer (drawable) creation callback
 139      */
 140     GLboolean (*CreateBuffer)(__DRIscreenPrivate *driScrnPriv,
 141                               __DRIdrawablePrivate *driDrawPriv,
 142                               const __GLcontextModes *glVis,
 143                               GLboolean pixmapBuffer);
 144
 145     /**
 146      * Buffer (drawable) destruction callback
 147      */
 148     void (*DestroyBuffer)(__DRIdrawablePrivate *driDrawPriv);
 149
 150     /**
 151      * Buffer swapping callback
 152      */
 153     void (*SwapBuffers)(__DRIdrawablePrivate *driDrawPriv);
 154
 155     /**
 156      * Context activation callback
 157      */
 158     GLboolean (*MakeCurrent)(__DRIcontextPrivate *driContextPriv,
 159                              __DRIdrawablePrivate *driDrawPriv,
 160                              __DRIdrawablePrivate *driReadPriv);
 161
 162     /**
 163      * Context unbinding callback
 164      */
 165     GLboolean (*UnbindContext)(__DRIcontextPrivate *driContextPriv);
 166
 167     /**
 168      * Full screen mode opening callback.
 169      *
 170      * \deprecated
 171      * Full screen functionality is no longer used by DRI.  Drivers should
 172      * simply install a function returning \c GL_TRUE for backwards
 173      * compatability.
 174      *
 175      * \todo
 176      * Nothing calls this function anymore.  Since this data structure is only
 177      * accessed with in the driver (i.e., libGL never sees it), we need to
 178      * remove the other cases that set this field and remove the field.
 179      */
 180     GLboolean (*OpenFullScreen)(__DRIcontextPrivate *driContextPriv);
 181
 182     /**
 183      * Full screen mode closing callback.
 184      *
 185      * \deprecated
 186      * Full screen functionality is no longer used by DRI.  Drivers should
 187      * simply install a function returning \c GL_TRUE for backwards
 188      * compatability.
 189      *
 190      * \todo
 191      * Nothing calls this function anymore.  Since this data structure is only
 192      * accessed with in the driver (i.e., libGL never sees it), we need to
 193      * remove the other cases that set this field and remove the field.
 194      */
 195     GLboolean (*CloseFullScreen)(__DRIcontextPrivate *driContextPriv);
 196
 197     /**
 198      * Retrieves statistics about buffer swap operations.  Required if
 199      * GLX_OML_sync_control or GLX_MESA_swap_frame_usage is supported.
 200      */
 201     int (*GetSwapInfo)( __DRIdrawablePrivate *dPriv, __DRIswapInfo * sInfo );
 202
 203
 204     /**
 205      * Required if GLX_SGI_video_sync or GLX_OML_sync_control is
 206      * supported.
 207      */
 208     int (*GetMSC)( __DRIscreenPrivate * priv, int64_t * count );
 209
 210     /**
 211      * These are required if GLX_OML_sync_control is supported.
 212      */
 213     /*@{*/
 214     int (*WaitForMSC)( __DRIdrawablePrivate *priv, int64_t target_msc,
 215                        int64_t divisor, int64_t remainder,
 216                        int64_t * msc );
 217     int (*WaitForSBC)( __DRIdrawablePrivate *priv, int64_t target_sbc,
 218                        int64_t * msc, int64_t * sbc );
 219
 220     int64_t (*SwapBuffersMSC)( __DRIdrawablePrivate *priv, int64_t target_msc,
 221                                int64_t divisor, int64_t remainder );
 222     /*@}*/
 223 };
 224
 225
 226 struct __DRIswapInfoRec {
 227     /**
 228      * Number of swapBuffers operations that have been *completed*.
 229      */
 230     uint64_t  swap_count;
 231
 232     /**
 233      * Unadjusted system time of the last buffer swap.  This is the time
 234      * when the swap completed, not the time when swapBuffers was called.
 235      */
 236     int64_t   swap_ust;
 237
 238     /**
 239      * Number of swap operations that occurred after the swap deadline.  That
 240      * is if a swap happens more than swap_interval frames after the previous
 241      * swap, it has missed its deadline.  If swap_interval is 0, then the
 242      * swap deadline is 1 frame after the previous swap.
 243      */
 244     uint64_t  swap_missed_count;
 245
 246     /**
 247      * Amount of time used by the last swap that missed its deadline.  This
 248      * is calculated as (__glXGetUST() - swap_ust) / (swap_interval *
 249      * time_for_single_vrefresh)).  If the actual value of swap_interval is
 250      * 0, then 1 is used instead.  If swap_missed_count is non-zero, this
 251      * should be greater-than 1.0.
 252      */
 253     float     swap_missed_usage;
 254 };
 255
 256
 257 /**
 258  * Per-drawable private DRI driver information.
 259  */
 260 struct __DRIdrawablePrivateRec {
 261     /**
 262      * Kernel drawable handle
 263      */
 264     drmDrawable hHWDrawable;
 265
 266     /**
 267      * Driver's private drawable information.
 268      *
 269      * This structure is opaque.
 270      */
 271     void *driverPrivate;
 272
 273     /**
 274      * X's drawable ID associated with this private drawable.
 275      */
 276     __DRIid draw;
 277     __DRIdrawable *pdraw;
 278
 279     /**
 280      * Reference count for number of context's currently bound to this
 281      * drawable.
 282      *
 283      * Once it reaches zero, the drawable can be destroyed.
 284      *
 285      * \note This behavior will change with GLX 1.3.
 286      */
 287     int refcount;
 288
 289     /**
 290      * Index of this drawable information in the SAREA.
 291      */
 292     unsigned int index;
 293
 294     /**
 295      * Pointer to the "drawable has changed ID" stamp in the SAREA.
 296      */
 297     unsigned int *pStamp;
 298
 299     /**
 300      * Last value of the stamp.
 301      *
 302      * If this differs from the value stored at __DRIdrawablePrivate::pStamp,
 303      * then the drawable information has been modified by the X server, and the
 304      * drawable information (below) should be retrieved from the X server.
 305      */
 306     unsigned int lastStamp;
 307
 308     /**
 309      * \name Drawable
 310      *
 311      * Drawable information used in software fallbacks.
 312      */
 313     /*@{*/
 314     int x;
 315     int y;
 316     int w;
 317     int h;
 318     int numClipRects;
 319     drm_clip_rect_t *pClipRects;
 320     /*@}*/
 321
 322     /**
 323      * \name Back and depthbuffer
 324      *
 325      * Information about the back and depthbuffer where different from above.
 326      */
 327     /*@{*/
 328     int backX;
 329     int backY;
 330     int backClipRectType;
 331     int numBackClipRects;
 332     drm_clip_rect_t *pBackClipRects;
 333     /*@}*/
 334
 335     /**
 336      * Pointer to context to which this drawable is currently bound.
 337      */
 338     __DRIcontextPrivate *driContextPriv;
 339
 340     /**
 341      * Pointer to screen on which this drawable was created.
 342      */
 343     __DRIscreenPrivate *driScreenPriv;
 344
 345     /**
 346      * \name Display and screen information.
 347      *
 348      * Basically just need these for when the locking code needs to call
 349      * __driUtilUpdateDrawableInfo() which calls XF86DRIGetDrawableInfo().
 350      */
 351     /*@{*/
 352     __DRInativeDisplay *display;
 353     int screen;
 354     /*@}*/
 355
 356     /**
 357      * Called via glXSwapBuffers().
 358      */
 359     void (*swapBuffers)( __DRIdrawablePrivate *dPriv );
 360
 361     /**
 362      * Get information about the location, size, and clip rects of the
 363      * drawable within the display.
 364      */
 365     PFNGLXGETDRAWABLEINFOPROC getInfo;
 366 };
 367
 368 /**
 369  * Per-context private driver information.
 370  */
 371 struct __DRIcontextPrivateRec {
 372     /**
 373      * Kernel context handle used to access the device lock.
 374      */
 375     XID contextID;
 376
 377     /**
 378      * Kernel context handle used to access the device lock.
 379      */
 380     drmContext hHWContext;
 381
 382     /**
 383      * Device driver's private context data.  This structure is opaque.
 384      */
 385     void *driverPrivate;
 386
 387     /**
 388      * This context's display pointer.
 389      */
 390     __DRInativeDisplay *display;
 391
 392     /**
 393      * Pointer to drawable currently bound to this context.
 394      */
 395     __DRIdrawablePrivate *driDrawablePriv;
 396
 397     /**
 398      * Pointer to screen on which this context was created.
 399      */
 400     __DRIscreenPrivate *driScreenPriv;
 401 };
 402
 403 /**
 404  * Per-screen private driver information.
 405  */
 406 struct __DRIscreenPrivateRec {
 407     /**
 408      * Display for this screen
 409      */
 410     __DRInativeDisplay *display;
 411
 412     /**
 413      * Current screen's number
 414      */
 415     int myNum;
 416
 417     /**
 418      * Callback functions into the hardware-specific DRI driver code.
 419      */
 420     struct __DriverAPIRec DriverAPI;
 421
 422     /**
 423      * \name DDX version
 424      * DDX / 2D driver version information.
 425      * \todo Replace these fields with a \c __DRIversionRec.
 426      */
 427     /*@{*/
 428     int ddxMajor;
 429     int ddxMinor;
 430     int ddxPatch;
 431     /*@}*/
 432
 433     /**
 434      * \name DRI version
 435      * DRI X extension version information.
 436      * \todo Replace these fields with a \c __DRIversionRec.
 437      */
 438     /*@{*/
 439     int driMajor;
 440     int driMinor;
 441     int driPatch;
 442     /*@}*/
 443
 444     /**
 445      * \name DRM version
 446      * DRM (kernel module) version information.
 447      * \todo Replace these fields with a \c __DRIversionRec.
 448      */
 449     /*@{*/
 450     int drmMajor;
 451     int drmMinor;
 452     int drmPatch;
 453     /*@}*/
 454
 455     /**
 456      * ID used when the client sets the drawable lock.
 457      *
 458      * The X server uses this value to detect if the client has died while
 459      * holding the drawable lock.
 460      */
 461     int drawLockID;
 462
 463     /**
 464      * File descriptor returned when the kernel device driver is opened.
 465      *
 466      * Used to:
 467      *   - authenticate client to kernel
 468      *   - map the frame buffer, SAREA, etc.
 469      *   - close the kernel device driver
 470      */
 471     int fd;
 472
 473     /**
 474      * SAREA pointer
 475      *
 476      * Used to access:
 477      *   - the device lock
 478      *   - the device-independent per-drawable and per-context(?) information
 479      */
 480     XF86DRISAREAPtr pSAREA;
 481
 482     /**
 483      * \name Direct frame buffer access information
 484      * Used for software fallbacks.
 485      */
 486     /*@{*/
 487     unsigned char *pFB;
 488     int fbSize;
 489     int fbOrigin;
 490     int fbStride;
 491     int fbWidth;
 492     int fbHeight;
 493     int fbBPP;
 494     /*@}*/
 495
 496     /**
 497      * \name Device-dependent private information (stored in the SAREA).
 498      *
 499      * This data is accessed by the client driver only.
 500      */
 501     /*@{*/
 502     void *pDevPriv;
 503     int devPrivSize;
 504     /*@}*/
 505
 506     /**
 507      * Dummy context to which drawables are bound when not bound to any
 508      * other context.
 509      *
 510      * A dummy hHWContext is created for this context, and is used by the GL
 511      * core when a hardware lock is required but the drawable is not currently
 512      * bound (e.g., potentially during a SwapBuffers request).  The dummy
 513      * context is created when the first "real" context is created on this
 514      * screen.
 515      */
 516     __DRIcontextPrivate dummyContextPriv;
 517
 518     /**
 519      * Hash table to hold the drawable information for this screen.
 520      */
 521     void *drawHash;
 522
 523     /**
 524      * Device-dependent private information (not stored in the SAREA).
 525      *
 526      * This pointer is never touched by the DRI layer.
 527      */
 528     void *private;
 529
 530     /**
 531      * GLX visuals / FBConfigs for this screen.  These are stored as a
 532      * linked list.
 533      *
 534      * \note
 535      * This field is \b only used in conjunction with the old interfaces.  If
 536      * the new interfaces are used, this field will be set to \c NULL and will
 537      * not be dereferenced.
 538      */
 539     __GLcontextModes *modes;
 540
 541     /**
 542      * Pointer back to the \c __DRIscreen that contains this structure.
 543      */
 544
 545     __DRIscreen *psc;
 546 };
 547
 548
 549
 550 extern void
 551 __driUtilMessage(const char *f, ...);
 552
 553
 554 extern void
 555 __driUtilUpdateDrawableInfo(__DRIdrawablePrivate *pdp);
 556
 557
 558 extern __DRIscreenPrivate * __driUtilCreateNewScreen( __DRInativeDisplay *dpy,
 559     int scrn, __DRIscreen *psc, __GLcontextModes * modes,
 560     const __DRIversion * ddx_version, const __DRIversion * dri_version,
 561     const __DRIversion * drm_version, const __DRIframebuffer * frame_buffer,
 562     drmAddress pSAREA, int fd, int internal_api_version,
 563     const struct __DriverAPIRec *driverAPI );
 564
 565 #ifndef DRI_NEW_INTERFACE_ONLY
 566 extern __DRIscreenPrivate *
 567 __driUtilCreateScreen(Display *dpy, int scrn, __DRIscreen *psc,
 568                       int numConfigs, __GLXvisualConfig *config,
 569                       const struct __DriverAPIRec *driverAPI);
 570 #endif /* DRI_NEW_INTERFACE_ONLY */
 571
 572 /* Test the version of the internal GLX API.  Returns a value like strcmp. */
 573 extern int
 574 driCompareGLXAPIVersion( GLuint required_version );
 575
 576 extern float
 577 driCalculateSwapUsage( __DRIdrawablePrivate *dPriv,
 578                        int64_t last_swap_ust, int64_t current_ust );
 579
 580 #endif /* GLX_DIRECT_RENDERING */
 581
 582 #endif /* _DRI_UTIL_H_ */