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

   1 /*
   2  * Copyright 1998-1999 Precision Insight, Inc., Cedar Park, Texas.
   3  * All Rights Reserved.
   4  *
   5  * Permission is hereby granted, free of charge, to any person obtaining a
   6  * copy of this software and associated documentation files (the
   7  * "Software"), to deal in the Software without restriction, including
   8  * without limitation the rights to use, copy, modify, merge, publish,
   9  * distribute, sub license, and/or sell copies of the Software, and to
  10  * permit persons to whom the Software is furnished to do so, subject to
  11  * the following conditions:
  12  *
  13  * The above copyright notice and this permission notice (including the
  14  * next paragraph) shall be included in all copies or substantial portions
  15  * 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
  19  * MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND NON-INFRINGEMENT.
  20  * IN NO EVENT SHALL PRECISION INSIGHT AND/OR ITS SUPPLIERS BE LIABLE FOR
  21  * ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN ACTION OF CONTRACT,
  22  * TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN CONNECTION WITH THE
  23  * SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE.
  24  */
  25
  26 /**
  27  * \file dri_util.h
  28  * DRI utility functions definitions.
  29  *
  30  * This module acts as glue between GLX and the actual hardware driver.  A DRI
  31  * driver doesn't really \e have to use any of this - it's optional.  But, some
  32  * useful stuff is done here that otherwise would have to be duplicated in most
  33  * drivers.
  34  *
  35  * Basically, these utility functions take care of some of the dirty details of
  36  * screen initialization, context creation, context binding, DRM setup, etc.
  37  *
  38  * These functions are compiled into each DRI driver so libGL.so knows nothing
  39  * about them.
  40  *
  41  * \sa dri_util.c.
  42  *
  43  * \author Kevin E. Martin <kevin@precisioninsight.com>
  44  * \author Brian Paul <brian@precisioninsight.com>
  45  */
  46
  47 #ifndef _DRI_UTIL_H_
  48 #define _DRI_UTIL_H_
  49
  50 #include <GL/gl.h>
  51 #include <drm.h>
  52 #include <drm_sarea.h>
  53 #include <xf86drm.h>
  54 #include "main/glheader.h"
  55 #include "main/mtypes.h"
  56 #include "GL/internal/glcore.h"
  57 #include "GL/internal/dri_interface.h"
  58
  59 #define GLX_BAD_CONTEXT                    5
  60
  61 typedef struct __DRIswapInfoRec        __DRIswapInfo;
  62
  63 /**
  64  * Extensions.
  65  */
  66 extern const __DRIlegacyExtension driLegacyExtension;
  67 extern const __DRIcoreExtension driCoreExtension;
  68 extern const __DRIdri2Extension driDRI2Extension;
  69 extern const __DRIextension driReadDrawableExtension;
  70 extern const __DRIcopySubBufferExtension driCopySubBufferExtension;
  71 extern const __DRIswapControlExtension driSwapControlExtension;
  72 extern const __DRIframeTrackingExtension driFrameTrackingExtension;
  73 extern const __DRImediaStreamCounterExtension driMediaStreamCounterExtension;
  74
  75 /**
  76  * Used by DRI_VALIDATE_DRAWABLE_INFO
  77  */
  78 #define DRI_VALIDATE_DRAWABLE_INFO_ONCE(pDrawPriv)              \
  79     do {                                                        \
  80         if (*(pDrawPriv->pStamp) != pDrawPriv->lastStamp) {     \
  81             __driUtilUpdateDrawableInfo(pDrawPriv);             \
  82         }                                                       \
  83     } while (0)
  84
  85
  86 /**
  87  * Utility macro to validate the drawable information.
  88  *
  89  * See __DRIdrawable::pStamp and __DRIdrawable::lastStamp.
  90  */
  91 #define DRI_VALIDATE_DRAWABLE_INFO(psp, pdp)                            \
  92 do {                                                                    \
  93     while (*(pdp->pStamp) != pdp->lastStamp) {                          \
  94         register unsigned int hwContext = psp->pSAREA->lock.lock &      \
  95                      ~(DRM_LOCK_HELD | DRM_LOCK_CONT);                  \
  96         DRM_UNLOCK(psp->fd, &psp->pSAREA->lock, hwContext);             \
  97                                                                         \
  98         DRM_SPINLOCK(&psp->pSAREA->drawable_lock, psp->drawLockID);     \
  99         DRI_VALIDATE_DRAWABLE_INFO_ONCE(pdp);                           \
 100         DRM_SPINUNLOCK(&psp->pSAREA->drawable_lock, psp->drawLockID);   \
 101                                                                         \
 102         DRM_LIGHT_LOCK(psp->fd, &psp->pSAREA->lock, hwContext);         \
 103     }                                                                   \
 104 } while (0)
 105
 106 /**
 107  * Same as above, but for two drawables simultaneously.
 108  *
 109  */
 110
 111 #define DRI_VALIDATE_TWO_DRAWABLES_INFO(psp, pdp, prp)                  \
 112 do {                                                            \
 113     while (*((pdp)->pStamp) != (pdp)->lastStamp ||                      \
 114            *((prp)->pStamp) != (prp)->lastStamp) {                      \
 115         register unsigned int hwContext = (psp)->pSAREA->lock.lock &    \
 116             ~(DRM_LOCK_HELD | DRM_LOCK_CONT);                           \
 117         DRM_UNLOCK((psp)->fd, &(psp)->pSAREA->lock, hwContext);         \
 118                                                                         \
 119         DRM_SPINLOCK(&(psp)->pSAREA->drawable_lock, (psp)->drawLockID); \
 120         DRI_VALIDATE_DRAWABLE_INFO_ONCE(pdp);                           \
 121         DRI_VALIDATE_DRAWABLE_INFO_ONCE(prp);                           \
 122         DRM_SPINUNLOCK(&(psp)->pSAREA->drawable_lock, (psp)->drawLockID); \
 123                                                                         \
 124         DRM_LIGHT_LOCK((psp)->fd, &(psp)->pSAREA->lock, hwContext);     \
 125     }                                                                   \
 126 } while (0)
 127
 128
 129 /**
 130  * Driver callback functions.
 131  *
 132  * Each DRI driver must have one of these structures with all the pointers set
 133  * to appropriate functions within the driver.
 134  *
 135  * When glXCreateContext() is called, for example, it'll call a helper function
 136  * dri_util.c which in turn will jump through the \a CreateContext pointer in
 137  * this structure.
 138  */
 139 struct __DriverAPIRec {
 140     const __DRIconfig **(*InitScreen) (__DRIscreen * priv);
 141
 142     /**
 143      * Screen destruction callback
 144      */
 145     void (*DestroyScreen)(__DRIscreen *driScrnPriv);
 146
 147     /**
 148      * Context creation callback
 149      */
 150     GLboolean (*CreateContext)(gl_api api,
 151                                const __GLcontextModes *glVis,
 152                                __DRIcontext *driContextPriv,
 153                                void *sharedContextPrivate);
 154
 155     /**
 156      * Context destruction callback
 157      */
 158     void (*DestroyContext)(__DRIcontext *driContextPriv);
 159
 160     /**
 161      * Buffer (drawable) creation callback
 162      */
 163     GLboolean (*CreateBuffer)(__DRIscreen *driScrnPriv,
 164                               __DRIdrawable *driDrawPriv,
 165                               const __GLcontextModes *glVis,
 166                               GLboolean pixmapBuffer);
 167
 168     /**
 169      * Buffer (drawable) destruction callback
 170      */
 171     void (*DestroyBuffer)(__DRIdrawable *driDrawPriv);
 172
 173     /**
 174      * Buffer swapping callback
 175      */
 176     void (*SwapBuffers)(__DRIdrawable *driDrawPriv);
 177
 178     /**
 179      * Context activation callback
 180      */
 181     GLboolean (*MakeCurrent)(__DRIcontext *driContextPriv,
 182                              __DRIdrawable *driDrawPriv,
 183                              __DRIdrawable *driReadPriv);
 184
 185     /**
 186      * Context unbinding callback
 187      */
 188     GLboolean (*UnbindContext)(__DRIcontext *driContextPriv);
 189
 190     /**
 191      * Retrieves statistics about buffer swap operations.  Required if
 192      * GLX_OML_sync_control or GLX_MESA_swap_frame_usage is supported.
 193      */
 194     int (*GetSwapInfo)( __DRIdrawable *dPriv, __DRIswapInfo * sInfo );
 195
 196
 197     /**
 198      * These are required if GLX_OML_sync_control is supported.
 199      */
 200     /*@{*/
 201     int (*WaitForMSC)( __DRIdrawable *priv, int64_t target_msc,
 202                        int64_t divisor, int64_t remainder,
 203                        int64_t * msc );
 204     int (*WaitForSBC)( __DRIdrawable *priv, int64_t target_sbc,
 205                        int64_t * msc, int64_t * sbc );
 206
 207     int64_t (*SwapBuffersMSC)( __DRIdrawable *priv, int64_t target_msc,
 208                                int64_t divisor, int64_t remainder );
 209     /*@}*/
 210     void (*CopySubBuffer)(__DRIdrawable *driDrawPriv,
 211                           int x, int y, int w, int h);
 212
 213     /**
 214      * New version of GetMSC so we can pass drawable data to the low
 215      * level DRM driver (e.g. pipe info).  Required if
 216      * GLX_SGI_video_sync or GLX_OML_sync_control is supported.
 217      */
 218     int (*GetDrawableMSC) ( __DRIscreen * priv,
 219                             __DRIdrawable *drawablePrivate,
 220                             int64_t *count);
 221
 222
 223
 224     /* DRI2 Entry point */
 225     const __DRIconfig **(*InitScreen2) (__DRIscreen * priv);
 226 };
 227
 228 extern const struct __DriverAPIRec driDriverAPI;
 229
 230
 231 struct __DRIswapInfoRec {
 232     /**
 233      * Number of swapBuffers operations that have been *completed*.
 234      */
 235     uint64_t swap_count;
 236
 237     /**
 238      * Unadjusted system time of the last buffer swap.  This is the time
 239      * when the swap completed, not the time when swapBuffers was called.
 240      */
 241     int64_t   swap_ust;
 242
 243     /**
 244      * Number of swap operations that occurred after the swap deadline.  That
 245      * is if a swap happens more than swap_interval frames after the previous
 246      * swap, it has missed its deadline.  If swap_interval is 0, then the
 247      * swap deadline is 1 frame after the previous swap.
 248      */
 249     uint64_t swap_missed_count;
 250
 251     /**
 252      * Amount of time used by the last swap that missed its deadline.  This
 253      * is calculated as (__glXGetUST() - swap_ust) / (swap_interval *
 254      * time_for_single_vrefresh)).  If the actual value of swap_interval is
 255      * 0, then 1 is used instead.  If swap_missed_count is non-zero, this
 256      * should be greater-than 1.0.
 257      */
 258     float     swap_missed_usage;
 259 };
 260
 261
 262 /**
 263  * Per-drawable private DRI driver information.
 264  */
 265 struct __DRIdrawableRec {
 266     /**
 267      * Kernel drawable handle
 268      */
 269     drm_drawable_t hHWDrawable;
 270
 271     /**
 272      * Driver's private drawable information.
 273      *
 274      * This structure is opaque.
 275      */
 276     void *driverPrivate;
 277
 278     /**
 279      * Private data from the loader.  We just hold on to it and pass
 280      * it back when calling into loader provided functions.
 281      */
 282     void *loaderPrivate;
 283
 284     /**
 285      * Reference count for number of context's currently bound to this
 286      * drawable.
 287      *
 288      * Once it reaches zero, the drawable can be destroyed.
 289      *
 290      * \note This behavior will change with GLX 1.3.
 291      */
 292     int refcount;
 293
 294     /**
 295      * Index of this drawable information in the SAREA.
 296      */
 297     unsigned int index;
 298
 299     /**
 300      * Pointer to the "drawable has changed ID" stamp in the SAREA (or
 301      * to dri2.stamp if DRI2 is being used).
 302      */
 303     unsigned int *pStamp;
 304
 305     /**
 306      * Last value of the stamp.
 307      *
 308      * If this differs from the value stored at __DRIdrawable::pStamp,
 309      * then the drawable information has been modified by the X server, and the
 310      * drawable information (below) should be retrieved from the X server.
 311      */
 312     unsigned int lastStamp;
 313
 314     /**
 315      * \name Drawable
 316      *
 317      * Drawable information used in software fallbacks.
 318      */
 319     /*@{*/
 320     int x;
 321     int y;
 322     int w;
 323     int h;
 324     int numClipRects;
 325     drm_clip_rect_t *pClipRects;
 326     /*@}*/
 327
 328     /**
 329      * \name Back and depthbuffer
 330      *
 331      * Information about the back and depthbuffer where different from above.
 332      */
 333     /*@{*/
 334     int backX;
 335     int backY;
 336     int backClipRectType;
 337     int numBackClipRects;
 338     drm_clip_rect_t *pBackClipRects;
 339     /*@}*/
 340
 341     /**
 342      * \name Vertical blank tracking information
 343      * Used for waiting on vertical blank events.
 344      */
 345     /*@{*/
 346     unsigned int vblSeq;
 347     unsigned int vblFlags;
 348     /*@}*/
 349
 350     /**
 351      * \name Monotonic MSC tracking
 352      *
 353      * Low level driver is responsible for updating msc_base and
 354      * vblSeq values so that higher level code can calculate
 355      * a new msc value or msc target for a WaitMSC call.  The new value
 356      * will be:
 357      *   msc = msc_base + get_vblank_count() - vblank_base;
 358      *
 359      * And for waiting on a value, core code will use:
 360      *   actual_target = target_msc - msc_base + vblank_base;
 361      */
 362     /*@{*/
 363     int64_t vblank_base;
 364     int64_t msc_base;
 365     /*@}*/
 366
 367     /**
 368      * Pointer to context to which this drawable is currently bound.
 369      */
 370     __DRIcontext *driContextPriv;
 371
 372     /**
 373      * Pointer to screen on which this drawable was created.
 374      */
 375     __DRIscreen *driScreenPriv;
 376
 377     /**
 378      * Controls swap interval as used by GLX_SGI_swap_control and
 379      * GLX_MESA_swap_control.
 380      */
 381     unsigned int swap_interval;
 382
 383     struct {
 384         unsigned int stamp;
 385         drm_clip_rect_t clipRect;
 386     } dri2;
 387 };
 388
 389 /**
 390  * Per-context private driver information.
 391  */
 392 struct __DRIcontextRec {
 393     /**
 394      * Kernel context handle used to access the device lock.
 395      */
 396     drm_context_t hHWContext;
 397
 398     /**
 399      * Device driver's private context data.  This structure is opaque.
 400      */
 401     void *driverPrivate;
 402
 403     /**
 404      * Pointer to drawable currently bound to this context for drawing.
 405      */
 406     __DRIdrawable *driDrawablePriv;
 407
 408     /**
 409      * Pointer to drawable currently bound to this context for reading.
 410      */
 411     __DRIdrawable *driReadablePriv;
 412
 413     /**
 414      * Pointer to screen on which this context was created.
 415      */
 416     __DRIscreen *driScreenPriv;
 417
 418     /**
 419      * The loaders's private context data.  This structure is opaque.
 420      */
 421     void *loaderPrivate;
 422
 423     struct {
 424         int draw_stamp;
 425         int read_stamp;
 426     } dri2;
 427 };
 428
 429 /**
 430  * Per-screen private driver information.
 431  */
 432 struct __DRIscreenRec {
 433     /**
 434      * Current screen's number
 435      */
 436     int myNum;
 437
 438     /**
 439      * Callback functions into the hardware-specific DRI driver code.
 440      */
 441     struct __DriverAPIRec DriverAPI;
 442
 443     const __DRIextension **extensions;
 444     /**
 445      * DDX / 2D driver version information.
 446      */
 447     __DRIversion ddx_version;
 448
 449     /**
 450      * DRI X extension version information.
 451      */
 452     __DRIversion dri_version;
 453
 454     /**
 455      * DRM (kernel module) version information.
 456      */
 457     __DRIversion drm_version;
 458
 459     /**
 460      * ID used when the client sets the drawable lock.
 461      *
 462      * The X server uses this value to detect if the client has died while
 463      * holding the drawable lock.
 464      */
 465     int drawLockID;
 466
 467     /**
 468      * File descriptor returned when the kernel device driver is opened.
 469      *
 470      * Used to:
 471      *   - authenticate client to kernel
 472      *   - map the frame buffer, SAREA, etc.
 473      *   - close the kernel device driver
 474      */
 475     int fd;
 476
 477     /**
 478      * SAREA pointer
 479      *
 480      * Used to access:
 481      *   - the device lock
 482      *   - the device-independent per-drawable and per-context(?) information
 483      */
 484     drm_sarea_t *pSAREA;
 485
 486     /**
 487      * \name Direct frame buffer access information
 488      * Used for software fallbacks.
 489      */
 490     /*@{*/
 491     unsigned char *pFB;
 492     int fbSize;
 493     int fbOrigin;
 494     int fbStride;
 495     int fbWidth;
 496     int fbHeight;
 497     int fbBPP;
 498     /*@}*/
 499
 500     /**
 501      * \name Device-dependent private information (stored in the SAREA).
 502      *
 503      * This data is accessed by the client driver only.
 504      */
 505     /*@{*/
 506     void *pDevPriv;
 507     int devPrivSize;
 508     /*@}*/
 509
 510     /**
 511      * Device-dependent private information (not stored in the SAREA).
 512      *
 513      * This pointer is never touched by the DRI layer.
 514      */
 515     void *private;
 516
 517     /* Extensions provided by the loader. */
 518     const __DRIgetDrawableInfoExtension *getDrawableInfo;
 519     const __DRIsystemTimeExtension *systemTime;
 520     const __DRIdamageExtension *damage;
 521
 522     struct {
 523         /* Flag to indicate that this is a DRI2 screen.  Many of the above
 524          * fields will not be valid or initializaed in that case. */
 525         int enabled;
 526         __DRIdri2LoaderExtension *loader;
 527         __DRIimageLookupExtension *image;
 528     } dri2;
 529
 530     /* The lock actually in use, old sarea or DRI2 */
 531     drmLock *lock;
 532
 533    unsigned int api_mask;
 534 };
 535
 536 extern void
 537 __driUtilUpdateDrawableInfo(__DRIdrawable *pdp);
 538
 539 extern float
 540 driCalculateSwapUsage( __DRIdrawable *dPriv,
 541                        int64_t last_swap_ust, int64_t current_ust );
 542
 543 extern GLint
 544 driIntersectArea( drm_clip_rect_t rect1, drm_clip_rect_t rect2 );
 545
 546 extern void
 547 dri2InvalidateDrawable(__DRIdrawable *drawable);
 548
 549 #endif /* _DRI_UTIL_H_ */