src/mesa/drivers/dri/intel/intel_context.c

   1 /**************************************************************************
   2  *
   3  * Copyright 2003 Tungsten Graphics, Inc., Cedar Park, Texas.
   4  * All Rights Reserved.
   5  *
   6  * Permission is hereby granted, free of charge, to any person obtaining a
   7  * copy of this software and associated documentation files (the
   8  * "Software"), to deal in the Software without restriction, including
   9  * without limitation the rights to use, copy, modify, merge, publish,
  10  * distribute, sub license, and/or sell copies of the Software, and to
  11  * permit persons to whom the Software is furnished to do so, subject to
  12  * the following conditions:
  13  *
  14  * The above copyright notice and this permission notice (including the
  15  * next paragraph) shall be included in all copies or substantial portions
  16  * of the Software.
  17  *
  18  * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS
  19  * OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF
  20  * MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND NON-INFRINGEMENT.
  21  * IN NO EVENT SHALL TUNGSTEN GRAPHICS AND/OR ITS SUPPLIERS BE LIABLE FOR
  22  * ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN ACTION OF CONTRACT,
  23  * TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN CONNECTION WITH THE
  24  * SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE.
  25  *
  26  **************************************************************************/
  27
  28
  29 #include "main/glheader.h"
  30 #include "main/context.h"
  31 #include "main/extensions.h"
  32 #include "main/fbobject.h"
  33 #include "main/framebuffer.h"
  34 #include "main/imports.h"
  35 #include "main/points.h"
  36 #include "main/renderbuffer.h"
  37
  38 #include "swrast/swrast.h"
  39 #include "swrast_setup/swrast_setup.h"
  40 #include "tnl/tnl.h"
  41 #include "drivers/common/driverfuncs.h"
  42 #include "drivers/common/meta.h"
  43
  44 #include "intel_chipset.h"
  45 #include "intel_buffers.h"
  46 #include "intel_tex.h"
  47 #include "intel_batchbuffer.h"
  48 #include "intel_clear.h"
  49 #include "intel_extensions.h"
  50 #include "intel_pixel.h"
  51 #include "intel_regions.h"
  52 #include "intel_buffer_objects.h"
  53 #include "intel_fbo.h"
  54 #include "intel_bufmgr.h"
  55 #include "intel_screen.h"
  56 #include "intel_mipmap_tree.h"
  57
  58 #include "utils.h"
  59 #include "../glsl/ralloc.h"
  60
  61 #ifndef INTEL_DEBUG
  62 int INTEL_DEBUG = (0);
  63 #endif
  64
  65
  66 static const GLubyte *
  67 intelGetString(struct gl_context * ctx, GLenum name)
  68 {
  69    const struct intel_context *const intel = intel_context(ctx);
  70    const char *chipset;
  71    static char buffer[128];
  72
  73    switch (name) {
  74    case GL_VENDOR:
  75       return (GLubyte *) "Tungsten Graphics, Inc";
  76       break;
  77
  78    case GL_RENDERER:
  79       switch (intel->intelScreen->deviceID) {
  80       case PCI_CHIP_845_G:
  81          chipset = "Intel(R) 845G";
  82          break;
  83       case PCI_CHIP_I830_M:
  84          chipset = "Intel(R) 830M";
  85          break;
  86       case PCI_CHIP_I855_GM:
  87          chipset = "Intel(R) 852GM/855GM";
  88          break;
  89       case PCI_CHIP_I865_G:
  90          chipset = "Intel(R) 865G";
  91          break;
  92       case PCI_CHIP_I915_G:
  93          chipset = "Intel(R) 915G";
  94          break;
  95       case PCI_CHIP_E7221_G:
  96          chipset = "Intel (R) E7221G (i915)";
  97          break;
  98       case PCI_CHIP_I915_GM:
  99          chipset = "Intel(R) 915GM";
 100          break;
 101       case PCI_CHIP_I945_G:
 102          chipset = "Intel(R) 945G";
 103          break;
 104       case PCI_CHIP_I945_GM:
 105          chipset = "Intel(R) 945GM";
 106          break;
 107       case PCI_CHIP_I945_GME:
 108          chipset = "Intel(R) 945GME";
 109          break;
 110       case PCI_CHIP_G33_G:
 111          chipset = "Intel(R) G33";
 112          break;
 113       case PCI_CHIP_Q35_G:
 114          chipset = "Intel(R) Q35";
 115          break;
 116       case PCI_CHIP_Q33_G:
 117          chipset = "Intel(R) Q33";
 118          break;
 119       case PCI_CHIP_IGD_GM:
 120       case PCI_CHIP_IGD_G:
 121          chipset = "Intel(R) IGD";
 122          break;
 123       case PCI_CHIP_I965_Q:
 124          chipset = "Intel(R) 965Q";
 125          break;
 126       case PCI_CHIP_I965_G:
 127       case PCI_CHIP_I965_G_1:
 128          chipset = "Intel(R) 965G";
 129          break;
 130       case PCI_CHIP_I946_GZ:
 131          chipset = "Intel(R) 946GZ";
 132          break;
 133       case PCI_CHIP_I965_GM:
 134          chipset = "Intel(R) 965GM";
 135          break;
 136       case PCI_CHIP_I965_GME:
 137          chipset = "Intel(R) 965GME/GLE";
 138          break;
 139       case PCI_CHIP_GM45_GM:
 140          chipset = "Mobile Intel® GM45 Express Chipset";
 141          break;
 142       case PCI_CHIP_IGD_E_G:
 143          chipset = "Intel(R) Integrated Graphics Device";
 144          break;
 145       case PCI_CHIP_G45_G:
 146          chipset = "Intel(R) G45/G43";
 147          break;
 148       case PCI_CHIP_Q45_G:
 149          chipset = "Intel(R) Q45/Q43";
 150          break;
 151       case PCI_CHIP_G41_G:
 152          chipset = "Intel(R) G41";
 153          break;
 154       case PCI_CHIP_B43_G:
 155       case PCI_CHIP_B43_G1:
 156          chipset = "Intel(R) B43";
 157          break;
 158       case PCI_CHIP_ILD_G:
 159          chipset = "Intel(R) Ironlake Desktop";
 160          break;
 161       case PCI_CHIP_ILM_G:
 162          chipset = "Intel(R) Ironlake Mobile";
 163          break;
 164       case PCI_CHIP_SANDYBRIDGE_GT1:
 165       case PCI_CHIP_SANDYBRIDGE_GT2:
 166       case PCI_CHIP_SANDYBRIDGE_GT2_PLUS:
 167          chipset = "Intel(R) Sandybridge Desktop";
 168          break;
 169       case PCI_CHIP_SANDYBRIDGE_M_GT1:
 170       case PCI_CHIP_SANDYBRIDGE_M_GT2:
 171       case PCI_CHIP_SANDYBRIDGE_M_GT2_PLUS:
 172          chipset = "Intel(R) Sandybridge Mobile";
 173          break;
 174       case PCI_CHIP_SANDYBRIDGE_S:
 175          chipset = "Intel(R) Sandybridge Server";
 176          break;
 177       case PCI_CHIP_IVYBRIDGE_GT1:
 178       case PCI_CHIP_IVYBRIDGE_GT2:
 179          chipset = "Intel(R) Ivybridge Desktop";
 180          break;
 181       case PCI_CHIP_IVYBRIDGE_M_GT1:
 182       case PCI_CHIP_IVYBRIDGE_M_GT2:
 183          chipset = "Intel(R) Ivybridge Mobile";
 184          break;
 185       case PCI_CHIP_IVYBRIDGE_S_GT1:
 186          chipset = "Intel(R) Ivybridge Server";
 187          break;
 188       default:
 189          chipset = "Unknown Intel Chipset";
 190          break;
 191       }
 192
 193       (void) driGetRendererString(buffer, chipset, 0);
 194       return (GLubyte *) buffer;
 195
 196    default:
 197       return NULL;
 198    }
 199 }
 200
 201 static void
 202 intel_flush_front(struct gl_context *ctx)
 203 {
 204    struct intel_context *intel = intel_context(ctx);
 205     __DRIcontext *driContext = intel->driContext;
 206     __DRIscreen *const screen = intel->intelScreen->driScrnPriv;
 207
 208    if ((ctx->DrawBuffer->Name == 0) && intel->front_buffer_dirty) {
 209       if (screen->dri2.loader &&
 210           (screen->dri2.loader->base.version >= 2)
 211           && (screen->dri2.loader->flushFrontBuffer != NULL) &&
 212           driContext->driDrawablePriv &&
 213           driContext->driDrawablePriv->loaderPrivate) {
 214          (*screen->dri2.loader->flushFrontBuffer)(driContext->driDrawablePriv,
 215                                                   driContext->driDrawablePriv->loaderPrivate);
 216
 217          /* We set the dirty bit in intel_prepare_render() if we're
 218           * front buffer rendering once we get there.
 219           */
 220          intel->front_buffer_dirty = false;
 221       }
 222    }
 223 }
 224
 225 static unsigned
 226 intel_bits_per_pixel(const struct intel_renderbuffer *rb)
 227 {
 228    return _mesa_get_format_bytes(intel_rb_format(rb)) * 8;
 229 }
 230
 231 static void
 232 intel_query_dri2_buffers_no_separate_stencil(struct intel_context *intel,
 233                                              __DRIdrawable *drawable,
 234                                              __DRIbuffer **buffers,
 235                                              int *count);
 236
 237 static void
 238 intel_process_dri2_buffer_no_separate_stencil(struct intel_context *intel,
 239                                               __DRIdrawable *drawable,
 240                                               __DRIbuffer *buffer,
 241                                               struct intel_renderbuffer *rb,
 242                                               const char *buffer_name);
 243
 244 static void
 245 intel_query_dri2_buffers_with_separate_stencil(struct intel_context *intel,
 246                                                __DRIdrawable *drawable,
 247                                                __DRIbuffer **buffers,
 248                                                unsigned **attachments,
 249                                                int *count);
 250
 251 static void
 252 intel_process_dri2_buffer_with_separate_stencil(struct intel_context *intel,
 253                                                 __DRIdrawable *drawable,
 254                                                 __DRIbuffer *buffer,
 255                                                 struct intel_renderbuffer *rb,
 256                                                 const char *buffer_name);
 257 static void
 258 intel_verify_dri2_has_hiz(struct intel_context *intel,
 259                           __DRIdrawable *drawable,
 260                           __DRIbuffer **buffers,
 261                           unsigned **attachments,
 262                           int *count);
 263
 264 void
 265 intel_update_renderbuffers(__DRIcontext *context, __DRIdrawable *drawable)
 266 {
 267    struct gl_framebuffer *fb = drawable->driverPrivate;
 268    struct intel_renderbuffer *rb;
 269    struct intel_context *intel = context->driverPrivate;
 270    __DRIbuffer *buffers = NULL;
 271    unsigned *attachments = NULL;
 272    int i, count;
 273    const char *region_name;
 274
 275    bool try_separate_stencil =
 276       intel->has_separate_stencil &&
 277       intel->intelScreen->dri2_has_hiz != INTEL_DRI2_HAS_HIZ_FALSE &&
 278       intel->intelScreen->driScrnPriv->dri2.loader != NULL &&
 279       intel->intelScreen->driScrnPriv->dri2.loader->base.version > 2 &&
 280       intel->intelScreen->driScrnPriv->dri2.loader->getBuffersWithFormat != NULL;
 281
 282    assert(!intel->must_use_separate_stencil || try_separate_stencil);
 283
 284    /* If we're rendering to the fake front buffer, make sure all the
 285     * pending drawing has landed on the real front buffer.  Otherwise
 286     * when we eventually get to DRI2GetBuffersWithFormat the stale
 287     * real front buffer contents will get copied to the new fake front
 288     * buffer.
 289     */
 290    if (intel->is_front_buffer_rendering) {
 291       intel_flush(&intel->ctx);
 292       intel_flush_front(&intel->ctx);
 293    }
 294
 295    /* Set this up front, so that in case our buffers get invalidated
 296     * while we're getting new buffers, we don't clobber the stamp and
 297     * thus ignore the invalidate. */
 298    drawable->lastStamp = drawable->dri2.stamp;
 299
 300    if (unlikely(INTEL_DEBUG & DEBUG_DRI))
 301       fprintf(stderr, "enter %s, drawable %p\n", __func__, drawable);
 302
 303    if (try_separate_stencil) {
 304       intel_query_dri2_buffers_with_separate_stencil(intel, drawable, &buffers,
 305                                                      &attachments, &count);
 306    } else {
 307       intel_query_dri2_buffers_no_separate_stencil(intel, drawable, &buffers,
 308                                                    &count);
 309    }
 310
 311    if (buffers == NULL)
 312       return;
 313
 314    for (i = 0; i < count; i++) {
 315        switch (buffers[i].attachment) {
 316        case __DRI_BUFFER_FRONT_LEFT:
 317            rb = intel_get_renderbuffer(fb, BUFFER_FRONT_LEFT);
 318            region_name = "dri2 front buffer";
 319            break;
 320
 321        case __DRI_BUFFER_FAKE_FRONT_LEFT:
 322            rb = intel_get_renderbuffer(fb, BUFFER_FRONT_LEFT);
 323            region_name = "dri2 fake front buffer";
 324            break;
 325
 326        case __DRI_BUFFER_BACK_LEFT:
 327            rb = intel_get_renderbuffer(fb, BUFFER_BACK_LEFT);
 328            region_name = "dri2 back buffer";
 329            break;
 330
 331        case __DRI_BUFFER_DEPTH:
 332            rb = intel_get_renderbuffer(fb, BUFFER_DEPTH);
 333            region_name = "dri2 depth buffer";
 334            break;
 335
 336        case __DRI_BUFFER_HIZ:
 337            /* The hiz region resides in the depth renderbuffer. */
 338            rb = intel_get_renderbuffer(fb, BUFFER_DEPTH);
 339            region_name = "dri2 hiz buffer";
 340            break;
 341
 342        case __DRI_BUFFER_DEPTH_STENCIL:
 343            rb = intel_get_renderbuffer(fb, BUFFER_DEPTH);
 344            region_name = "dri2 depth / stencil buffer";
 345            break;
 346
 347        case __DRI_BUFFER_STENCIL:
 348            rb = intel_get_renderbuffer(fb, BUFFER_STENCIL);
 349            region_name = "dri2 stencil buffer";
 350            break;
 351
 352        case __DRI_BUFFER_ACCUM:
 353        default:
 354            fprintf(stderr,
 355                    "unhandled buffer attach event, attachment type %d\n",
 356                    buffers[i].attachment);
 357            return;
 358        }
 359
 360        if (try_separate_stencil) {
 361          intel_process_dri2_buffer_with_separate_stencil(intel, drawable,
 362                                                          &buffers[i], rb,
 363                                                          region_name);
 364        } else {
 365          intel_process_dri2_buffer_no_separate_stencil(intel, drawable,
 366                                                        &buffers[i], rb,
 367                                                        region_name);
 368        }
 369    }
 370
 371    if (try_separate_stencil
 372        && intel->intelScreen->dri2_has_hiz == INTEL_DRI2_HAS_HIZ_UNKNOWN) {
 373       intel_verify_dri2_has_hiz(intel, drawable, &buffers, &attachments,
 374                                 &count);
 375    }
 376
 377    if (attachments)
 378       free(attachments);
 379
 380    driUpdateFramebufferSize(&intel->ctx, drawable);
 381 }
 382
 383 /**
 384  * intel_prepare_render should be called anywhere that curent read/drawbuffer
 385  * state is required.
 386  */
 387 void
 388 intel_prepare_render(struct intel_context *intel)
 389 {
 390    __DRIcontext *driContext = intel->driContext;
 391    __DRIdrawable *drawable;
 392
 393    drawable = driContext->driDrawablePriv;
 394    if (drawable && drawable->dri2.stamp != driContext->dri2.draw_stamp) {
 395       if (drawable->lastStamp != drawable->dri2.stamp)
 396          intel_update_renderbuffers(driContext, drawable);
 397       intel_draw_buffer(&intel->ctx);
 398       driContext->dri2.draw_stamp = drawable->dri2.stamp;
 399    }
 400
 401    drawable = driContext->driReadablePriv;
 402    if (drawable && drawable->dri2.stamp != driContext->dri2.read_stamp) {
 403       if (drawable->lastStamp != drawable->dri2.stamp)
 404          intel_update_renderbuffers(driContext, drawable);
 405       driContext->dri2.read_stamp = drawable->dri2.stamp;
 406    }
 407
 408    /* If we're currently rendering to the front buffer, the rendering
 409     * that will happen next will probably dirty the front buffer.  So
 410     * mark it as dirty here.
 411     */
 412    if (intel->is_front_buffer_rendering)
 413       intel->front_buffer_dirty = true;
 414
 415    /* Wait for the swapbuffers before the one we just emitted, so we
 416     * don't get too many swaps outstanding for apps that are GPU-heavy
 417     * but not CPU-heavy.
 418     *
 419     * We're using intelDRI2Flush (called from the loader before
 420     * swapbuffer) and glFlush (for front buffer rendering) as the
 421     * indicator that a frame is done and then throttle when we get
 422     * here as we prepare to render the next frame.  At this point for
 423     * round trips for swap/copy and getting new buffers are done and
 424     * we'll spend less time waiting on the GPU.
 425     *
 426     * Unfortunately, we don't have a handle to the batch containing
 427     * the swap, and getting our hands on that doesn't seem worth it,
 428     * so we just us the first batch we emitted after the last swap.
 429     */
 430    if (intel->need_throttle && intel->first_post_swapbuffers_batch) {
 431       drm_intel_bo_wait_rendering(intel->first_post_swapbuffers_batch);
 432       drm_intel_bo_unreference(intel->first_post_swapbuffers_batch);
 433       intel->first_post_swapbuffers_batch = NULL;
 434       intel->need_throttle = false;
 435    }
 436 }
 437
 438 static void
 439 intel_viewport(struct gl_context *ctx, GLint x, GLint y, GLsizei w, GLsizei h)
 440 {
 441     struct intel_context *intel = intel_context(ctx);
 442     __DRIcontext *driContext = intel->driContext;
 443
 444     if (intel->saved_viewport)
 445         intel->saved_viewport(ctx, x, y, w, h);
 446
 447     if (ctx->DrawBuffer->Name == 0) {
 448        dri2InvalidateDrawable(driContext->driDrawablePriv);
 449        dri2InvalidateDrawable(driContext->driReadablePriv);
 450     }
 451 }
 452
 453 static const struct dri_debug_control debug_control[] = {
 454    { "tex",   DEBUG_TEXTURE},
 455    { "state", DEBUG_STATE},
 456    { "ioctl", DEBUG_IOCTL},
 457    { "blit",  DEBUG_BLIT},
 458    { "mip",   DEBUG_MIPTREE},
 459    { "fall",  DEBUG_FALLBACKS},
 460    { "verb",  DEBUG_VERBOSE},
 461    { "bat",   DEBUG_BATCH},
 462    { "pix",   DEBUG_PIXEL},
 463    { "buf",   DEBUG_BUFMGR},
 464    { "reg",   DEBUG_REGION},
 465    { "fbo",   DEBUG_FBO},
 466    { "gs",    DEBUG_GS},
 467    { "sync",  DEBUG_SYNC},
 468    { "prim",  DEBUG_PRIMS },
 469    { "vert",  DEBUG_VERTS },
 470    { "dri",   DEBUG_DRI },
 471    { "sf",    DEBUG_SF },
 472    { "san",   DEBUG_SANITY },
 473    { "sleep", DEBUG_SLEEP },
 474    { "stats", DEBUG_STATS },
 475    { "tile",  DEBUG_TILE },
 476    { "wm",    DEBUG_WM },
 477    { "urb",   DEBUG_URB },
 478    { "vs",    DEBUG_VS },
 479    { "clip",  DEBUG_CLIP },
 480    { NULL,    0 }
 481 };
 482
 483
 484 static void
 485 intelInvalidateState(struct gl_context * ctx, GLuint new_state)
 486 {
 487     struct intel_context *intel = intel_context(ctx);
 488
 489    _swrast_InvalidateState(ctx, new_state);
 490    _vbo_InvalidateState(ctx, new_state);
 491
 492    intel->NewGLState |= new_state;
 493
 494    if (intel->vtbl.invalidate_state)
 495       intel->vtbl.invalidate_state( intel, new_state );
 496 }
 497
 498 void
 499 intel_flush_rendering_to_batch(struct gl_context *ctx)
 500 {
 501    struct intel_context *intel = intel_context(ctx);
 502
 503    if (intel->Fallback)
 504       _swrast_flush(ctx);
 505
 506    if (intel->gen < 4)
 507       INTEL_FIREVERTICES(intel);
 508 }
 509
 510 void
 511 _intel_flush(struct gl_context *ctx, const char *file, int line)
 512 {
 513    struct intel_context *intel = intel_context(ctx);
 514
 515    intel_flush_rendering_to_batch(ctx);
 516
 517    if (intel->batch.used)
 518       _intel_batchbuffer_flush(intel, file, line);
 519 }
 520
 521 static void
 522 intel_glFlush(struct gl_context *ctx)
 523 {
 524    struct intel_context *intel = intel_context(ctx);
 525
 526    intel_flush(ctx);
 527    intel_flush_front(ctx);
 528    if (intel->is_front_buffer_rendering)
 529       intel->need_throttle = true;
 530 }
 531
 532 void
 533 intelFinish(struct gl_context * ctx)
 534 {
 535    struct intel_context *intel = intel_context(ctx);
 536
 537    intel_flush(ctx);
 538    intel_flush_front(ctx);
 539
 540    if (intel->batch.last_bo)
 541       drm_intel_bo_wait_rendering(intel->batch.last_bo);
 542 }
 543
 544 void
 545 intelInitDriverFunctions(struct dd_function_table *functions)
 546 {
 547    _mesa_init_driver_functions(functions);
 548
 549    functions->Flush = intel_glFlush;
 550    functions->Finish = intelFinish;
 551    functions->GetString = intelGetString;
 552    functions->UpdateState = intelInvalidateState;
 553
 554    intelInitTextureFuncs(functions);
 555    intelInitTextureImageFuncs(functions);
 556    intelInitTextureSubImageFuncs(functions);
 557    intelInitTextureCopyImageFuncs(functions);
 558    intelInitStateFuncs(functions);
 559    intelInitClearFuncs(functions);
 560    intelInitBufferFuncs(functions);
 561    intelInitPixelFuncs(functions);
 562    intelInitBufferObjectFuncs(functions);
 563    intel_init_syncobj_functions(functions);
 564 }
 565
 566 bool
 567 intelInitContext(struct intel_context *intel,
 568                  int api,
 569                  const struct gl_config * mesaVis,
 570                  __DRIcontext * driContextPriv,
 571                  void *sharedContextPrivate,
 572                  struct dd_function_table *functions)
 573 {
 574    struct gl_context *ctx = &intel->ctx;
 575    struct gl_context *shareCtx = (struct gl_context *) sharedContextPrivate;
 576    __DRIscreen *sPriv = driContextPriv->driScreenPriv;
 577    struct intel_screen *intelScreen = sPriv->driverPrivate;
 578    int bo_reuse_mode;
 579    struct gl_config visual;
 580
 581    /* we can't do anything without a connection to the device */
 582    if (intelScreen->bufmgr == NULL)
 583       return false;
 584
 585    /* Can't rely on invalidate events, fall back to glViewport hack */
 586    if (!driContextPriv->driScreenPriv->dri2.useInvalidate) {
 587       intel->saved_viewport = functions->Viewport;
 588       functions->Viewport = intel_viewport;
 589    }
 590
 591    if (mesaVis == NULL) {
 592       memset(&visual, 0, sizeof visual);
 593       mesaVis = &visual;
 594    }
 595
 596    if (!_mesa_initialize_context(&intel->ctx, api, mesaVis, shareCtx,
 597                                  functions, (void *) intel)) {
 598       printf("%s: failed to init mesa context\n", __FUNCTION__);
 599       return false;
 600    }
 601
 602    driContextPriv->driverPrivate = intel;
 603    intel->intelScreen = intelScreen;
 604    intel->driContext = driContextPriv;
 605    intel->driFd = sPriv->fd;
 606
 607    intel->gen = intelScreen->gen;
 608
 609    const int devID = intelScreen->deviceID;
 610
 611    if (IS_SNB_GT1(devID) || IS_IVB_GT1(devID))
 612       intel->gt = 1;
 613    else if (IS_SNB_GT2(devID) || IS_IVB_GT2(devID))
 614       intel->gt = 2;
 615    else
 616       intel->gt = 0;
 617
 618    if (IS_G4X(devID)) {
 619       intel->is_g4x = true;
 620    } else if (IS_945(devID)) {
 621       intel->is_945 = true;
 622    }
 623
 624    if (intel->gen >= 5) {
 625       intel->needs_ff_sync = true;
 626    }
 627
 628    intel->has_separate_stencil = intel->intelScreen->hw_has_separate_stencil;
 629    intel->must_use_separate_stencil = intel->intelScreen->hw_must_use_separate_stencil;
 630    intel->has_hiz = intel->intelScreen->hw_has_hiz;
 631    intel->has_llc = intel->intelScreen->hw_has_llc;
 632
 633    memset(&ctx->TextureFormatSupported,
 634           0, sizeof(ctx->TextureFormatSupported));
 635
 636    driParseConfigFiles(&intel->optionCache, &intelScreen->optionCache,
 637                        sPriv->myNum, (intel->gen >= 4) ? "i965" : "i915");
 638    if (intel->gen < 4)
 639       intel->maxBatchSize = 4096;
 640    else
 641       intel->maxBatchSize = sizeof(intel->batch.map);
 642
 643    intel->bufmgr = intelScreen->bufmgr;
 644
 645    bo_reuse_mode = driQueryOptioni(&intel->optionCache, "bo_reuse");
 646    switch (bo_reuse_mode) {
 647    case DRI_CONF_BO_REUSE_DISABLED:
 648       break;
 649    case DRI_CONF_BO_REUSE_ALL:
 650       intel_bufmgr_gem_enable_reuse(intel->bufmgr);
 651       break;
 652    }
 653
 654    /* This doesn't yet catch all non-conformant rendering, but it's a
 655     * start.
 656     */
 657    if (getenv("INTEL_STRICT_CONFORMANCE")) {
 658       unsigned int value = atoi(getenv("INTEL_STRICT_CONFORMANCE"));
 659       if (value > 0) {
 660          intel->conformance_mode = value;
 661       }
 662       else {
 663          intel->conformance_mode = 1;
 664       }
 665    }
 666
 667    if (intel->conformance_mode > 0) {
 668       ctx->Const.MinLineWidth = 1.0;
 669       ctx->Const.MinLineWidthAA = 1.0;
 670       ctx->Const.MaxLineWidth = 1.0;
 671       ctx->Const.MaxLineWidthAA = 1.0;
 672       ctx->Const.LineWidthGranularity = 1.0;
 673    }
 674    else {
 675       ctx->Const.MinLineWidth = 1.0;
 676       ctx->Const.MinLineWidthAA = 1.0;
 677       ctx->Const.MaxLineWidth = 5.0;
 678       ctx->Const.MaxLineWidthAA = 5.0;
 679       ctx->Const.LineWidthGranularity = 0.5;
 680    }
 681
 682    ctx->Const.MinPointSize = 1.0;
 683    ctx->Const.MinPointSizeAA = 1.0;
 684    ctx->Const.MaxPointSize = 255.0;
 685    ctx->Const.MaxPointSizeAA = 3.0;
 686    ctx->Const.PointSizeGranularity = 1.0;
 687
 688    ctx->Const.MaxSamples = 1.0;
 689
 690    if (intel->gen >= 6)
 691       ctx->Const.MaxClipPlanes = 8;
 692
 693    ctx->Const.StripTextureBorder = GL_TRUE;
 694
 695    /* reinitialize the context point state.
 696     * It depend on constants in __struct gl_contextRec::Const
 697     */
 698    _mesa_init_point(ctx);
 699
 700    if (intel->gen >= 4) {
 701       if (MAX_WIDTH > 8192)
 702          ctx->Const.MaxRenderbufferSize = 8192;
 703    } else {
 704       if (MAX_WIDTH > 2048)
 705          ctx->Const.MaxRenderbufferSize = 2048;
 706    }
 707
 708    /* Initialize the software rasterizer and helper modules. */
 709    _swrast_CreateContext(ctx);
 710    _vbo_CreateContext(ctx);
 711    _tnl_CreateContext(ctx);
 712    _swsetup_CreateContext(ctx);
 713
 714    /* Configure swrast to match hardware characteristics: */
 715    _swrast_allow_pixel_fog(ctx, false);
 716    _swrast_allow_vertex_fog(ctx, true);
 717
 718    _mesa_meta_init(ctx);
 719
 720    intel->hw_stencil = mesaVis->stencilBits && mesaVis->depthBits == 24;
 721    intel->hw_stipple = 1;
 722
 723    /* XXX FBO: this doesn't seem to be used anywhere */
 724    switch (mesaVis->depthBits) {
 725    case 0:                     /* what to do in this case? */
 726    case 16:
 727       intel->polygon_offset_scale = 1.0;
 728       break;
 729    case 24:
 730       intel->polygon_offset_scale = 2.0;     /* req'd to pass glean */
 731       break;
 732    default:
 733       assert(0);
 734       break;
 735    }
 736
 737    if (intel->gen >= 4)
 738       intel->polygon_offset_scale /= 0xffff;
 739
 740    intel->RenderIndex = ~0;
 741
 742    switch (ctx->API) {
 743    case API_OPENGL:
 744       intelInitExtensions(ctx);
 745       break;
 746    case API_OPENGLES:
 747       intelInitExtensionsES1(ctx);
 748       break;
 749    case API_OPENGLES2:
 750       intelInitExtensionsES2(ctx);
 751       break;
 752    }
 753
 754    INTEL_DEBUG = driParseDebugString(getenv("INTEL_DEBUG"), debug_control);
 755    if (INTEL_DEBUG & DEBUG_BUFMGR)
 756       dri_bufmgr_set_debug(intel->bufmgr, true);
 757
 758    intel_batchbuffer_init(intel);
 759
 760    intel_fbo_init(intel);
 761
 762    intel->use_texture_tiling = driQueryOptionb(&intel->optionCache,
 763                                                "texture_tiling");
 764    intel->use_early_z = driQueryOptionb(&intel->optionCache, "early_z");
 765
 766    intel->prim.primitive = ~0;
 767
 768    /* Force all software fallbacks */
 769    if (driQueryOptionb(&intel->optionCache, "no_rast")) {
 770       fprintf(stderr, "disabling 3D rasterization\n");
 771       intel->no_rast = 1;
 772    }
 773
 774    if (driQueryOptionb(&intel->optionCache, "always_flush_batch")) {
 775       fprintf(stderr, "flushing batchbuffer before/after each draw call\n");
 776       intel->always_flush_batch = 1;
 777    }
 778
 779    if (driQueryOptionb(&intel->optionCache, "always_flush_cache")) {
 780       fprintf(stderr, "flushing GPU caches before/after each draw call\n");
 781       intel->always_flush_cache = 1;
 782    }
 783
 784    return true;
 785 }
 786
 787 void
 788 intelDestroyContext(__DRIcontext * driContextPriv)
 789 {
 790    struct intel_context *intel =
 791       (struct intel_context *) driContextPriv->driverPrivate;
 792
 793    assert(intel);               /* should never be null */
 794    if (intel) {
 795       INTEL_FIREVERTICES(intel);
 796
 797       _mesa_meta_free(&intel->ctx);
 798
 799       intel->vtbl.destroy(intel);
 800
 801       _swsetup_DestroyContext(&intel->ctx);
 802       _tnl_DestroyContext(&intel->ctx);
 803       _vbo_DestroyContext(&intel->ctx);
 804
 805       _swrast_DestroyContext(&intel->ctx);
 806       intel->Fallback = 0x0;      /* don't call _swrast_Flush later */
 807
 808       intel_batchbuffer_free(intel);
 809
 810       free(intel->prim.vb);
 811       intel->prim.vb = NULL;
 812       drm_intel_bo_unreference(intel->prim.vb_bo);
 813       intel->prim.vb_bo = NULL;
 814       drm_intel_bo_unreference(intel->first_post_swapbuffers_batch);
 815       intel->first_post_swapbuffers_batch = NULL;
 816
 817       driDestroyOptionCache(&intel->optionCache);
 818
 819       /* free the Mesa context */
 820       _mesa_free_context_data(&intel->ctx);
 821
 822       _math_matrix_dtr(&intel->ViewportMatrix);
 823
 824       ralloc_free(intel);
 825       driContextPriv->driverPrivate = NULL;
 826    }
 827 }
 828
 829 GLboolean
 830 intelUnbindContext(__DRIcontext * driContextPriv)
 831 {
 832    /* Unset current context and dispath table */
 833    _mesa_make_current(NULL, NULL, NULL);
 834
 835    return true;
 836 }
 837
 838 GLboolean
 839 intelMakeCurrent(__DRIcontext * driContextPriv,
 840                  __DRIdrawable * driDrawPriv,
 841                  __DRIdrawable * driReadPriv)
 842 {
 843    struct intel_context *intel;
 844    GET_CURRENT_CONTEXT(curCtx);
 845
 846    if (driContextPriv)
 847       intel = (struct intel_context *) driContextPriv->driverPrivate;
 848    else
 849       intel = NULL;
 850
 851    /* According to the glXMakeCurrent() man page: "Pending commands to
 852     * the previous context, if any, are flushed before it is released."
 853     * But only flush if we're actually changing contexts.
 854     */
 855    if (intel_context(curCtx) && intel_context(curCtx) != intel) {
 856       _mesa_flush(curCtx);
 857    }
 858
 859    if (driContextPriv) {
 860       struct gl_framebuffer *fb, *readFb;
 861
 862       if (driDrawPriv == NULL && driReadPriv == NULL) {
 863          fb = _mesa_get_incomplete_framebuffer();
 864          readFb = _mesa_get_incomplete_framebuffer();
 865       } else {
 866          fb = driDrawPriv->driverPrivate;
 867          readFb = driReadPriv->driverPrivate;
 868          driContextPriv->dri2.draw_stamp = driDrawPriv->dri2.stamp - 1;
 869          driContextPriv->dri2.read_stamp = driReadPriv->dri2.stamp - 1;
 870       }
 871
 872       intel_prepare_render(intel);
 873       _mesa_make_current(&intel->ctx, fb, readFb);
 874
 875       /* We do this in intel_prepare_render() too, but intel->ctx.DrawBuffer
 876        * is NULL at that point.  We can't call _mesa_makecurrent()
 877        * first, since we need the buffer size for the initial
 878        * viewport.  So just call intel_draw_buffer() again here. */
 879       intel_draw_buffer(&intel->ctx);
 880    }
 881    else {
 882       _mesa_make_current(NULL, NULL, NULL);
 883    }
 884
 885    return true;
 886 }
 887
 888 /**
 889  * \brief Query DRI2 to obtain a DRIdrawable's buffers.
 890  *
 891  * To determine which DRI buffers to request, examine the renderbuffers
 892  * attached to the drawable's framebuffer. Then request the buffers with
 893  * DRI2GetBuffers() or DRI2GetBuffersWithFormat().
 894  *
 895  * This is called from intel_update_renderbuffers(). It is used only if either
 896  * the hardware or the X driver lacks separate stencil support.
 897  *
 898  * \param drawable      Drawable whose buffers are queried.
 899  * \param buffers       [out] List of buffers returned by DRI2 query.
 900  * \param buffer_count  [out] Number of buffers returned.
 901  *
 902  * \see intel_update_renderbuffers()
 903  * \see DRI2GetBuffers()
 904  * \see DRI2GetBuffersWithFormat()
 905  */
 906 static void
 907 intel_query_dri2_buffers_no_separate_stencil(struct intel_context *intel,
 908                                              __DRIdrawable *drawable,
 909                                              __DRIbuffer **buffers,
 910                                              int *buffer_count)
 911 {
 912    assert(!intel->must_use_separate_stencil);
 913
 914    __DRIscreen *screen = intel->intelScreen->driScrnPriv;
 915    struct gl_framebuffer *fb = drawable->driverPrivate;
 916
 917    if (screen->dri2.loader
 918        && screen->dri2.loader->base.version > 2
 919        && screen->dri2.loader->getBuffersWithFormat != NULL) {
 920
 921       int i = 0;
 922       const int max_attachments = 4;
 923       unsigned *attachments = calloc(2 * max_attachments, sizeof(unsigned));
 924
 925       struct intel_renderbuffer *front_rb;
 926       struct intel_renderbuffer *back_rb;
 927       struct intel_renderbuffer *depth_rb;
 928       struct intel_renderbuffer *stencil_rb;
 929
 930       front_rb = intel_get_renderbuffer(fb, BUFFER_FRONT_LEFT);
 931       back_rb = intel_get_renderbuffer(fb, BUFFER_BACK_LEFT);
 932       depth_rb = intel_get_renderbuffer(fb, BUFFER_DEPTH);
 933       stencil_rb = intel_get_renderbuffer(fb, BUFFER_STENCIL);
 934
 935       if ((intel->is_front_buffer_rendering ||
 936            intel->is_front_buffer_reading ||
 937            !back_rb) && front_rb) {
 938          attachments[i++] = __DRI_BUFFER_FRONT_LEFT;
 939          attachments[i++] = intel_bits_per_pixel(front_rb);
 940       }
 941
 942       if (back_rb) {
 943          attachments[i++] = __DRI_BUFFER_BACK_LEFT;
 944          attachments[i++] = intel_bits_per_pixel(back_rb);
 945       }
 946
 947       if (depth_rb && stencil_rb) {
 948          attachments[i++] = __DRI_BUFFER_DEPTH_STENCIL;
 949          attachments[i++] = intel_bits_per_pixel(depth_rb);
 950       } else if (depth_rb) {
 951          attachments[i++] = __DRI_BUFFER_DEPTH;
 952          attachments[i++] = intel_bits_per_pixel(depth_rb);
 953       } else if (stencil_rb) {
 954          attachments[i++] = __DRI_BUFFER_STENCIL;
 955          attachments[i++] = intel_bits_per_pixel(stencil_rb);
 956       }
 957
 958       assert(i <= 2 * max_attachments);
 959
 960       *buffers = screen->dri2.loader->getBuffersWithFormat(drawable,
 961                                                            &drawable->w,
 962                                                            &drawable->h,
 963                                                            attachments, i / 2,
 964                                                            buffer_count,
 965                                                            drawable->loaderPrivate);
 966       free(attachments);
 967
 968    } else if (screen->dri2.loader) {
 969
 970       int i = 0;
 971       const int max_attachments = 4;
 972       unsigned *attachments = calloc(max_attachments, sizeof(unsigned));
 973
 974       if (intel_get_renderbuffer(fb, BUFFER_FRONT_LEFT))
 975          attachments[i++] = __DRI_BUFFER_FRONT_LEFT;
 976       if (intel_get_renderbuffer(fb, BUFFER_BACK_LEFT))
 977          attachments[i++] = __DRI_BUFFER_BACK_LEFT;
 978       if (intel_get_renderbuffer(fb, BUFFER_DEPTH))
 979          attachments[i++] = __DRI_BUFFER_DEPTH;
 980       if (intel_get_renderbuffer(fb, BUFFER_STENCIL))
 981          attachments[i++] = __DRI_BUFFER_STENCIL;
 982
 983       assert(i <= max_attachments);
 984
 985       *buffers = screen->dri2.loader->getBuffersWithFormat(drawable,
 986                                                            &drawable->w,
 987                                                            &drawable->h,
 988                                                            attachments, i,
 989                                                            buffer_count,
 990                                                            drawable->loaderPrivate);
 991       free(attachments);
 992
 993    } else {
 994       *buffers = NULL;
 995       *buffer_count = 0;
 996    }
 997 }
 998
 999 /**
1000  * \brief Assign a DRI buffer's DRM region to a renderbuffer.
1001  *
1002  * This is called from intel_update_renderbuffers().  It is used only if
1003  * either the hardware or the X driver lacks separate stencil support.
1004  *
1005  * \par Note:
1006  *    DRI buffers whose attachment point is DRI2BufferStencil or
1007  *    DRI2BufferDepthStencil are handled as special cases.
1008  *
1009  * \param buffer_name is a human readable name, such as "dri2 front buffer",
1010  *        that is passed to intel_region_alloc_for_handle().
1011  *
1012  * \see intel_update_renderbuffers()
1013  * \see intel_region_alloc_for_handle()
1014  */
1015 static void
1016 intel_process_dri2_buffer_no_separate_stencil(struct intel_context *intel,
1017                                               __DRIdrawable *drawable,
1018                                               __DRIbuffer *buffer,
1019                                               struct intel_renderbuffer *rb,
1020                                               const char *buffer_name)
1021 {
1022    assert(!intel->must_use_separate_stencil);
1023
1024    struct gl_framebuffer *fb = drawable->driverPrivate;
1025    struct intel_renderbuffer *depth_rb = NULL;
1026
1027    if (!rb)
1028       return;
1029
1030    if (rb->mt &&
1031        rb->mt->region &&
1032        rb->mt->region->name == buffer->name)
1033       return;
1034
1035    if (unlikely(INTEL_DEBUG & DEBUG_DRI)) {
1036       fprintf(stderr,
1037               "attaching buffer %d, at %d, cpp %d, pitch %d\n",
1038               buffer->name, buffer->attachment,
1039               buffer->cpp, buffer->pitch);
1040    }
1041
1042    bool identify_depth_and_stencil = false;
1043    if (buffer->attachment == __DRI_BUFFER_STENCIL) {
1044       struct intel_renderbuffer *depth_rb =
1045          intel_get_renderbuffer(fb, BUFFER_DEPTH);
1046       identify_depth_and_stencil = depth_rb && depth_rb->mt;
1047    }
1048
1049    if (identify_depth_and_stencil) {
1050       if (unlikely(INTEL_DEBUG & DEBUG_DRI)) {
1051          fprintf(stderr, "(reusing depth buffer as stencil)\n");
1052       }
1053       intel_miptree_reference(&rb->mt, depth_rb->mt);
1054    } else {
1055       intel_miptree_release(&rb->mt);
1056       struct intel_region *region =
1057                    intel_region_alloc_for_handle(intel->intelScreen,
1058                                                  buffer->cpp,
1059                                                  drawable->w,
1060                                                  drawable->h,
1061                                                  buffer->pitch / buffer->cpp,
1062                                                  buffer->name,
1063                                                  buffer_name);
1064       if (!region)
1065          return;
1066
1067       rb->mt = intel_miptree_create_for_region(intel,
1068                                                GL_TEXTURE_2D,
1069                                                intel_rb_format(rb),
1070                                                region);
1071       intel_region_release(&region);
1072       if (!rb->mt)
1073          return;
1074    }
1075
1076    if (buffer->attachment == __DRI_BUFFER_DEPTH_STENCIL) {
1077       struct intel_renderbuffer *stencil_rb =
1078          intel_get_renderbuffer(fb, BUFFER_STENCIL);
1079
1080       if (!stencil_rb)
1081          return;
1082
1083       /* The rb passed in is the BUFFER_DEPTH attachment, and we need
1084        * to associate this region to BUFFER_STENCIL as well.
1085        */
1086       intel_miptree_reference(&stencil_rb->mt, rb->mt);
1087    }
1088 }
1089
1090 /**
1091  * \brief Query DRI2 to obtain a DRIdrawable's buffers.
1092  *
1093  * To determine which DRI buffers to request, examine the renderbuffers
1094  * attached to the drawable's framebuffer. Then request the buffers with
1095  * DRI2GetBuffersWithFormat().
1096  *
1097  * This is called from intel_update_renderbuffers(). It is used when 1) the
1098  * hardware supports separate stencil and 2) the X driver's separate stencil
1099  * support has been verified to work or is still unknown.
1100  *
1101  * \param drawable      Drawable whose buffers are queried.
1102  * \param buffers       [out] List of buffers returned by DRI2 query.
1103  * \param buffer_count  [out] Number of buffers returned.
1104  * \param attachments   [out] List of pairs (attachment_point, bits_per_pixel)
1105  *                      that were submitted in the DRI2 query. Number of pairs
1106  *                      is same as buffer_count.
1107  *
1108  * \see intel_update_renderbuffers()
1109  * \see DRI2GetBuffersWithFormat()
1110  * \see enum intel_dri2_has_hiz
1111  */
1112 static void
1113 intel_query_dri2_buffers_with_separate_stencil(struct intel_context *intel,
1114                                                __DRIdrawable *drawable,
1115                                                __DRIbuffer **buffers,
1116                                                unsigned **attachments,
1117                                                int *count)
1118 {
1119    assert(intel->has_separate_stencil);
1120
1121    __DRIscreen *screen = intel->intelScreen->driScrnPriv;
1122    struct gl_framebuffer *fb = drawable->driverPrivate;
1123
1124    const int max_attachments = 5;
1125    int i = 0;
1126
1127    *attachments = calloc(2 * max_attachments, sizeof(unsigned));
1128    if (!*attachments) {
1129       *buffers = NULL;
1130       *count = 0;
1131       return;
1132    }
1133
1134    struct intel_renderbuffer *front_rb;
1135    struct intel_renderbuffer *back_rb;
1136    struct intel_renderbuffer *depth_rb;
1137    struct intel_renderbuffer *stencil_rb;
1138
1139    front_rb = intel_get_renderbuffer(fb, BUFFER_FRONT_LEFT);
1140    back_rb = intel_get_renderbuffer(fb, BUFFER_BACK_LEFT);
1141    depth_rb = intel_get_renderbuffer(fb, BUFFER_DEPTH);
1142    stencil_rb = intel_get_renderbuffer(fb, BUFFER_STENCIL);
1143
1144    if ((intel->is_front_buffer_rendering ||
1145         intel->is_front_buffer_reading ||
1146         !back_rb) && front_rb) {
1147       (*attachments)[i++] = __DRI_BUFFER_FRONT_LEFT;
1148       (*attachments)[i++] = intel_bits_per_pixel(front_rb);
1149    }
1150
1151    if (back_rb) {
1152       (*attachments)[i++] = __DRI_BUFFER_BACK_LEFT;
1153       (*attachments)[i++] = intel_bits_per_pixel(back_rb);
1154    }
1155
1156    /*
1157     * We request a separate stencil buffer, and perhaps a hiz buffer too, even
1158     * if we do not yet know if the X driver supports it. See the comments for
1159     * 'enum intel_dri2_has_hiz'.
1160     */
1161
1162    if (depth_rb) {
1163       (*attachments)[i++] = __DRI_BUFFER_DEPTH;
1164       (*attachments)[i++] = intel_bits_per_pixel(depth_rb);
1165
1166       if (intel->vtbl.is_hiz_depth_format(intel, intel_rb_format(depth_rb))) {
1167          /* Depth and hiz buffer have same bpp. */
1168          (*attachments)[i++] = __DRI_BUFFER_HIZ;
1169          (*attachments)[i++] = intel_bits_per_pixel(depth_rb);
1170       }
1171    }
1172
1173    if (stencil_rb) {
1174       assert(intel_rb_format(stencil_rb) == MESA_FORMAT_S8);
1175       (*attachments)[i++] = __DRI_BUFFER_STENCIL;
1176       (*attachments)[i++] = intel_bits_per_pixel(stencil_rb);
1177    }
1178
1179    assert(i <= 2 * max_attachments);
1180
1181    *buffers = screen->dri2.loader->getBuffersWithFormat(drawable,
1182                                                         &drawable->w,
1183                                                         &drawable->h,
1184                                                         *attachments, i / 2,
1185                                                         count,
1186                                                         drawable->loaderPrivate);
1187
1188    if (!*buffers) {
1189       free(*attachments);
1190       *attachments = NULL;
1191       *count = 0;
1192    }
1193 }
1194
1195 /**
1196  * \brief Assign a DRI buffer's DRM region to a renderbuffer.
1197  *
1198  * This is called from intel_update_renderbuffers().  It is used when 1) the
1199  * hardware supports separate stencil and 2) the X driver's separate stencil
1200  * support has been verified to work or is still unknown.
1201  *
1202  * \par Note:
1203  *    DRI buffers whose attachment point is DRI2BufferStencil or DRI2BufferHiz
1204  *    are handled as special cases.
1205  *
1206  * \param buffer_name is a human readable name, such as "dri2 front buffer",
1207  *        that is passed to intel_region_alloc_for_handle().
1208  *
1209  * \see intel_update_renderbuffers()
1210  * \see intel_region_alloc_for_handle()
1211  * \see enum intel_dri2_has_hiz
1212  */
1213 static void
1214 intel_process_dri2_buffer_with_separate_stencil(struct intel_context *intel,
1215                                                 __DRIdrawable *drawable,
1216                                                 __DRIbuffer *buffer,
1217                                                 struct intel_renderbuffer *rb,
1218                                                 const char *buffer_name)
1219 {
1220    assert(intel->has_separate_stencil);
1221    assert(buffer->attachment != __DRI_BUFFER_DEPTH_STENCIL);
1222
1223    if (!rb)
1224       return;
1225
1226    /* If the renderbuffer's and DRIbuffer's regions match, then continue. */
1227    if ((buffer->attachment != __DRI_BUFFER_HIZ &&
1228         rb->mt &&
1229         rb->mt->region &&
1230         rb->mt->region->name == buffer->name) ||
1231        (buffer->attachment == __DRI_BUFFER_HIZ &&
1232         rb->mt &&
1233         rb->mt->hiz_mt &&
1234         rb->mt->hiz_mt->region->name == buffer->name)) {
1235       return;
1236    }
1237
1238    if (unlikely(INTEL_DEBUG & DEBUG_DRI)) {
1239       fprintf(stderr,
1240               "attaching buffer %d, at %d, cpp %d, pitch %d\n",
1241               buffer->name, buffer->attachment,
1242               buffer->cpp, buffer->pitch);
1243    }
1244
1245    int buffer_width;
1246    int buffer_height;
1247    if (buffer->attachment == __DRI_BUFFER_STENCIL) {
1248       /* The stencil buffer has quirky pitch requirements.  From Section
1249        * 2.11.5.6.2.1 3DSTATE_STENCIL_BUFFER, field "Surface Pitch":
1250        *    The pitch must be set to 2x the value computed based on width, as
1251        *    the stencil buffer is stored with two rows interleaved.
1252        *
1253        * To satisfy the pitch requirement, the X driver allocated the region
1254        * with the following dimensions.
1255        */
1256        buffer_width = ALIGN(drawable->w, 64);
1257        buffer_height = ALIGN(ALIGN(drawable->h, 2) / 2, 64);
1258    } else {
1259        buffer_width = drawable->w;
1260        buffer_height = drawable->h;
1261    }
1262
1263    /* Release the buffer storage now in case we have to return early
1264     * due to failure to allocate new storage.
1265     */
1266    if (buffer->attachment == __DRI_BUFFER_HIZ) {
1267       intel_miptree_release(&rb->mt->hiz_mt);
1268    } else {
1269       intel_miptree_release(&rb->mt);
1270    }
1271
1272    struct intel_region *region =
1273       intel_region_alloc_for_handle(intel->intelScreen,
1274                                     buffer->cpp,
1275                                     buffer_width,
1276                                     buffer_height,
1277                                     buffer->pitch / buffer->cpp,
1278                                     buffer->name,
1279                                     buffer_name);
1280    if (!region)
1281       return;
1282
1283    struct intel_mipmap_tree *mt =
1284       intel_miptree_create_for_region(intel,
1285                                       GL_TEXTURE_2D,
1286                                       intel_rb_format(rb),
1287                                       region);
1288    intel_region_release(&region);
1289
1290    /* Associate buffer with new storage. */
1291    if (buffer->attachment == __DRI_BUFFER_HIZ) {
1292       rb->mt->hiz_mt = mt;
1293    } else {
1294       rb->mt = mt;
1295    }
1296 }
1297
1298 /**
1299  * \brief Verify that the X driver supports hiz and separate stencil.
1300  *
1301  * This implements the cleanup stage of the handshake described in the
1302  * comments for 'enum intel_dri2_has_hiz'.
1303  *
1304  * This should be called from intel_update_renderbuffers() after 1) the
1305  * DRIdrawable has been queried for its buffers via DRI2GetBuffersWithFormat()
1306  * and 2) the DRM region of each returned DRIbuffer has been assigned to the
1307  * appropriate intel_renderbuffer. Furthermore, this should be called *only*
1308  * when 1) intel_update_renderbuffers() tried to used the X driver's separate
1309  * stencil functionality and 2) it has not yet been determined if the X driver
1310  * supports separate stencil.
1311  *
1312  * If we determine that the X driver does have support, then we set
1313  * intel_screen.dri2_has_hiz to true and return.
1314  *
1315  * If we determine that the X driver lacks support, and we requested
1316  * a DRI2BufferDepth and DRI2BufferStencil, then we must remedy the mistake by
1317  * taking the following actions:
1318  *    1. Discard the framebuffer's stencil and depth renderbuffers.
1319  *    2. Create a combined depth/stencil renderbuffer and attach
1320  *       it to the framebuffer's depth and stencil attachment points.
1321  *    3. Query the drawable for a new set of buffers, which consists of the
1322  *       originally requested set plus DRI2BufferDepthStencil.
1323  *    4. Assign the DRI2BufferDepthStencil's DRM region to the new
1324  *       depth/stencil renderbuffer.
1325  *
1326  * \pre intel->intelScreen->dri2_has_hiz == INTEL_DRI2_HAS_HIZ_UNKNOWN
1327  *
1328  * \param drawable      Drawable whose buffers were queried.
1329  *
1330  * \param buffers       [in/out] As input, the buffer list returned by the
1331  *                      original DRI2 query. As output, the current buffer
1332  *                      list, which may have been altered by a new DRI2 query.
1333  *
1334  * \param attachments   [in/out] As input, the attachment list submitted
1335  *                      in the original DRI2 query. As output, the attachment
1336  *                      list that was submitted in the DRI2 query that
1337  *                      obtained the current buffer list, as returned in the
1338  *                      output parameter \c buffers.  (Note: If no new query
1339  *                      was made, then the list remains unaltered).
1340  *
1341  * \param count         [out] Number of buffers in the current buffer list, as
1342  *                      returned in the output parameter \c buffers.
1343  *
1344  * \see enum intel_dri2_has_hiz
1345  * \see struct intel_screen::dri2_has_hiz
1346  * \see intel_update_renderbuffers
1347  */
1348 static void
1349 intel_verify_dri2_has_hiz(struct intel_context *intel,
1350                           __DRIdrawable *drawable,
1351                           __DRIbuffer **buffers,
1352                           unsigned **attachments,
1353                           int *count)
1354 {
1355    assert(intel->intelScreen->dri2_has_hiz == INTEL_DRI2_HAS_HIZ_UNKNOWN);
1356
1357    struct gl_framebuffer *fb = drawable->driverPrivate;
1358    struct intel_renderbuffer *stencil_rb =
1359       intel_get_renderbuffer(fb, BUFFER_STENCIL);
1360
1361    if (stencil_rb) {
1362       /*
1363        * We requested a DRI2BufferStencil without knowing if the X driver
1364        * supports it. Now, check if X handled the request correctly and clean
1365        * up if it did not. (See comments for 'enum intel_dri2_has_hiz').
1366        */
1367       struct intel_renderbuffer *depth_rb =
1368          intel_get_renderbuffer(fb, BUFFER_DEPTH);
1369       assert(intel_rb_format(stencil_rb) == MESA_FORMAT_S8);
1370       assert(depth_rb && intel_rb_format(depth_rb) == MESA_FORMAT_X8_Z24);
1371
1372       if (stencil_rb->mt->region->tiling == I915_TILING_NONE) {
1373          /*
1374           * The stencil buffer is actually W tiled. The region's tiling is
1375           * I915_TILING_NONE, however, because the GTT is incapable of W
1376           * fencing.
1377           */
1378          intel->intelScreen->dri2_has_hiz = INTEL_DRI2_HAS_HIZ_TRUE;
1379          return;
1380       } else {
1381          /*
1382           * Oops... the screen doesn't support separate stencil. Discard the
1383           * separate depth and stencil buffers and replace them with
1384           * a combined depth/stencil buffer. Discard the hiz buffer too.
1385           */
1386          intel->intelScreen->dri2_has_hiz = INTEL_DRI2_HAS_HIZ_FALSE;
1387          if (intel->must_use_separate_stencil) {
1388             _mesa_problem(&intel->ctx,
1389                           "intel_context requires separate stencil, but the "
1390                           "DRIscreen does not support it. You may need to "
1391                           "upgrade the Intel X driver to 2.16.0");
1392             abort();
1393          }
1394
1395          /* 1. Discard depth and stencil renderbuffers. */
1396          _mesa_remove_renderbuffer(fb, BUFFER_DEPTH);
1397          depth_rb = NULL;
1398          _mesa_remove_renderbuffer(fb, BUFFER_STENCIL);
1399          stencil_rb = NULL;
1400
1401          /* 2. Create new depth/stencil renderbuffer. */
1402          struct intel_renderbuffer *depth_stencil_rb =
1403             intel_create_renderbuffer(MESA_FORMAT_S8_Z24);
1404          _mesa_add_renderbuffer(fb, BUFFER_DEPTH, &depth_stencil_rb->Base.Base);
1405          _mesa_add_renderbuffer(fb, BUFFER_STENCIL, &depth_stencil_rb->Base.Base);
1406
1407          /* 3. Append DRI2BufferDepthStencil to attachment list. */
1408          int old_count = *count;
1409          unsigned int *old_attachments = *attachments;
1410          *count = old_count + 1;
1411          *attachments = malloc(2 * (*count) * sizeof(unsigned));
1412          memcpy(*attachments, old_attachments, 2 * old_count * sizeof(unsigned));
1413          free(old_attachments);
1414          (*attachments)[2 * old_count + 0] = __DRI_BUFFER_DEPTH_STENCIL;
1415          (*attachments)[2 * old_count + 1] = intel_bits_per_pixel(depth_stencil_rb);
1416
1417          /* 4. Request new set of DRI2 attachments. */
1418          __DRIscreen *screen = intel->intelScreen->driScrnPriv;
1419          *buffers = screen->dri2.loader->getBuffersWithFormat(drawable,
1420                                                               &drawable->w,
1421                                                               &drawable->h,
1422                                                               *attachments,
1423                                                               *count,
1424                                                               count,
1425                                                               drawable->loaderPrivate);
1426          if (!*buffers)
1427             return;
1428
1429          /*
1430           * I don't know how to recover from the failure assertion below.
1431           * Rather than fail gradually and unexpectedly, we should just die
1432           * now.
1433           */
1434          assert(*count == old_count + 1);
1435
1436          /* 5. Assign the DRI buffer's DRM region to the its renderbuffers. */
1437          __DRIbuffer *depth_stencil_buffer = NULL;
1438          for (int i = 0; i < *count; ++i) {
1439             if ((*buffers)[i].attachment == __DRI_BUFFER_DEPTH_STENCIL) {
1440                depth_stencil_buffer = &(*buffers)[i];
1441                break;
1442             }
1443          }
1444          struct intel_region *region =
1445             intel_region_alloc_for_handle(intel->intelScreen,
1446                                           depth_stencil_buffer->cpp,
1447                                           drawable->w,
1448                                           drawable->h,
1449                                           depth_stencil_buffer->pitch
1450                                              / depth_stencil_buffer->cpp,
1451                                           depth_stencil_buffer->name,
1452                                           "dri2 depth / stencil buffer");
1453          if (!region)
1454             return;
1455
1456          struct intel_mipmap_tree *mt =
1457                intel_miptree_create_for_region(intel,
1458                                                GL_TEXTURE_2D,
1459                                                intel_rb_format(depth_stencil_rb),
1460                                                region);
1461          intel_region_release(&region);
1462          if (!mt)
1463             return;
1464
1465          intel_miptree_reference(&intel_get_renderbuffer(fb, BUFFER_DEPTH)->mt, mt);
1466          intel_miptree_reference(&intel_get_renderbuffer(fb, BUFFER_STENCIL)->mt, mt);
1467          intel_miptree_release(&mt);
1468       }
1469    }
1470
1471    if (intel_framebuffer_has_hiz(fb)) {
1472       /*
1473        * In the future, the driver may advertise a GL config with hiz
1474        * compatible depth bits and 0 stencil bits (for example, when the
1475        * driver gains support for float32 depth buffers). When that day comes,
1476        * here we need to verify that the X driver does in fact support hiz and
1477        * clean up if it doesn't.
1478        *
1479        * Presently, however, no verification or clean up is necessary, and
1480        * execution should not reach here. If the framebuffer still has a hiz
1481        * region, then we have already set dri2_has_hiz to true after
1482        * confirming above that the stencil buffer is W tiled.
1483        */
1484       assert(0);
1485    }
1486 }