src/mesa/drivers/dri/i915/intel_context.c

   1 /**************************************************************************
   2  *
   3  * Copyright 2003 VMware, Inc.
   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 VMWARE 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 "util/debug.h"
  60 #include "util/ralloc.h"
  61
  62 int INTEL_DEBUG = (0);
  63
  64 const char *const i915_vendor_string = "Intel Open Source Technology Center";
  65
  66 const char *
  67 i915_get_renderer_string(unsigned deviceID)
  68 {
  69    const char *chipset;
  70    static char buffer[128];
  71
  72    switch (deviceID) {
  73 #undef CHIPSET
  74 #define CHIPSET(id, symbol, str) case id: chipset = str; break;
  75 #include "pci_ids/i915_pci_ids.h"
  76    default:
  77       chipset = "Unknown Intel Chipset";
  78       break;
  79    }
  80
  81    (void) driGetRendererString(buffer, chipset, 0);
  82    return buffer;
  83 }
  84
  85 static const GLubyte *
  86 intelGetString(struct gl_context * ctx, GLenum name)
  87 {
  88    const struct intel_context *const intel = intel_context(ctx);
  89
  90    switch (name) {
  91    case GL_VENDOR:
  92       return (GLubyte *) i915_vendor_string;
  93
  94    case GL_RENDERER:
  95       return
  96          (GLubyte *) i915_get_renderer_string(intel->intelScreen->deviceID);
  97
  98    default:
  99       return NULL;
 100    }
 101 }
 102
 103 #define flushFront(screen)      ((screen)->image.loader ? (screen)->image.loader->flushFrontBuffer : (screen)->dri2.loader->flushFrontBuffer)
 104
 105 static void
 106 intel_flush_front(struct gl_context *ctx)
 107 {
 108    struct intel_context *intel = intel_context(ctx);
 109     __DRIcontext *driContext = intel->driContext;
 110     __DRIdrawable *driDrawable = driContext->driDrawablePriv;
 111     __DRIscreen *const screen = intel->intelScreen->driScrnPriv;
 112
 113     if (intel->front_buffer_dirty && _mesa_is_winsys_fbo(ctx->DrawBuffer)) {
 114       if (flushFront(screen) &&
 115           driDrawable &&
 116           driDrawable->loaderPrivate) {
 117          flushFront(screen)(driDrawable, driDrawable->loaderPrivate);
 118
 119          /* We set the dirty bit in intel_prepare_render() if we're
 120           * front buffer rendering once we get there.
 121           */
 122          intel->front_buffer_dirty = false;
 123       }
 124    }
 125 }
 126
 127 static void
 128 intel_update_image_buffers(struct intel_context *intel, __DRIdrawable *drawable);
 129
 130 static unsigned
 131 intel_bits_per_pixel(const struct intel_renderbuffer *rb)
 132 {
 133    return _mesa_get_format_bytes(intel_rb_format(rb)) * 8;
 134 }
 135
 136 static void
 137 intel_query_dri2_buffers(struct intel_context *intel,
 138                          __DRIdrawable *drawable,
 139                          __DRIbuffer **buffers,
 140                          int *count);
 141
 142 static void
 143 intel_process_dri2_buffer(struct intel_context *intel,
 144                           __DRIdrawable *drawable,
 145                           __DRIbuffer *buffer,
 146                           struct intel_renderbuffer *rb,
 147                           const char *buffer_name);
 148
 149 static void
 150 intel_update_dri2_buffers(struct intel_context *intel, __DRIdrawable *drawable)
 151 {
 152    __DRIbuffer *buffers = NULL;
 153    int i, count;
 154    const char *region_name;
 155    struct intel_renderbuffer *rb;
 156    struct gl_framebuffer *fb = drawable->driverPrivate;
 157
 158    intel_query_dri2_buffers(intel, drawable, &buffers, &count);
 159
 160    if (buffers == NULL)
 161       return;
 162
 163    for (i = 0; i < count; i++) {
 164       switch (buffers[i].attachment) {
 165       case __DRI_BUFFER_FRONT_LEFT:
 166          rb = intel_get_renderbuffer(fb, BUFFER_FRONT_LEFT);
 167          region_name = "dri2 front buffer";
 168          break;
 169
 170       case __DRI_BUFFER_FAKE_FRONT_LEFT:
 171          rb = intel_get_renderbuffer(fb, BUFFER_FRONT_LEFT);
 172          region_name = "dri2 fake front buffer";
 173          break;
 174
 175       case __DRI_BUFFER_BACK_LEFT:
 176          rb = intel_get_renderbuffer(fb, BUFFER_BACK_LEFT);
 177          region_name = "dri2 back buffer";
 178          break;
 179
 180       case __DRI_BUFFER_DEPTH:
 181       case __DRI_BUFFER_HIZ:
 182       case __DRI_BUFFER_DEPTH_STENCIL:
 183       case __DRI_BUFFER_STENCIL:
 184       case __DRI_BUFFER_ACCUM:
 185       default:
 186          fprintf(stderr,
 187                  "unhandled buffer attach event, attachment type %d\n",
 188                  buffers[i].attachment);
 189          return;
 190       }
 191
 192       intel_process_dri2_buffer(intel, drawable, &buffers[i], rb, region_name);
 193    }
 194 }
 195
 196 void
 197 intel_update_renderbuffers(__DRIcontext *context, __DRIdrawable *drawable)
 198 {
 199    struct intel_context *intel = context->driverPrivate;
 200    __DRIscreen *screen = intel->intelScreen->driScrnPriv;
 201
 202    /* Set this up front, so that in case our buffers get invalidated
 203     * while we're getting new buffers, we don't clobber the stamp and
 204     * thus ignore the invalidate. */
 205    drawable->lastStamp = drawable->dri2.stamp;
 206
 207    if (unlikely(INTEL_DEBUG & DEBUG_DRI))
 208       fprintf(stderr, "enter %s, drawable %p\n", __func__, drawable);
 209
 210    if (screen->image.loader)
 211       intel_update_image_buffers(intel, drawable);
 212    else
 213       intel_update_dri2_buffers(intel, drawable);
 214
 215    driUpdateFramebufferSize(&intel->ctx, drawable);
 216 }
 217
 218 /**
 219  * intel_prepare_render should be called anywhere that curent read/drawbuffer
 220  * state is required.
 221  */
 222 void
 223 intel_prepare_render(struct intel_context *intel)
 224 {
 225    __DRIcontext *driContext = intel->driContext;
 226    __DRIdrawable *drawable;
 227
 228    drawable = driContext->driDrawablePriv;
 229    if (drawable && drawable->dri2.stamp != driContext->dri2.draw_stamp) {
 230       if (drawable->lastStamp != drawable->dri2.stamp)
 231          intel_update_renderbuffers(driContext, drawable);
 232       intel_draw_buffer(&intel->ctx);
 233       driContext->dri2.draw_stamp = drawable->dri2.stamp;
 234    }
 235
 236    drawable = driContext->driReadablePriv;
 237    if (drawable && drawable->dri2.stamp != driContext->dri2.read_stamp) {
 238       if (drawable->lastStamp != drawable->dri2.stamp)
 239          intel_update_renderbuffers(driContext, drawable);
 240       driContext->dri2.read_stamp = drawable->dri2.stamp;
 241    }
 242
 243    /* If we're currently rendering to the front buffer, the rendering
 244     * that will happen next will probably dirty the front buffer.  So
 245     * mark it as dirty here.
 246     */
 247    if (_mesa_is_front_buffer_drawing(intel->ctx.DrawBuffer))
 248       intel->front_buffer_dirty = true;
 249
 250    /* Wait for the swapbuffers before the one we just emitted, so we
 251     * don't get too many swaps outstanding for apps that are GPU-heavy
 252     * but not CPU-heavy.
 253     *
 254     * We're using intelDRI2Flush (called from the loader before
 255     * swapbuffer) and glFlush (for front buffer rendering) as the
 256     * indicator that a frame is done and then throttle when we get
 257     * here as we prepare to render the next frame.  At this point for
 258     * round trips for swap/copy and getting new buffers are done and
 259     * we'll spend less time waiting on the GPU.
 260     *
 261     * Unfortunately, we don't have a handle to the batch containing
 262     * the swap, and getting our hands on that doesn't seem worth it,
 263     * so we just us the first batch we emitted after the last swap.
 264     */
 265    if (intel->need_throttle && intel->first_post_swapbuffers_batch) {
 266       if (!intel->disable_throttling)
 267          drm_intel_bo_wait_rendering(intel->first_post_swapbuffers_batch);
 268       drm_intel_bo_unreference(intel->first_post_swapbuffers_batch);
 269       intel->first_post_swapbuffers_batch = NULL;
 270       intel->need_throttle = false;
 271    }
 272 }
 273
 274 static void
 275 intel_noninvalidate_viewport(struct gl_context *ctx)
 276 {
 277     struct intel_context *intel = intel_context(ctx);
 278     __DRIcontext *driContext = intel->driContext;
 279
 280     intelCalcViewport(ctx);
 281
 282     if (_mesa_is_winsys_fbo(ctx->DrawBuffer)) {
 283        dri2InvalidateDrawable(driContext->driDrawablePriv);
 284        dri2InvalidateDrawable(driContext->driReadablePriv);
 285     }
 286 }
 287
 288 static void
 289 intel_viewport(struct gl_context *ctx)
 290 {
 291     intelCalcViewport(ctx);
 292 }
 293
 294 static const struct debug_control debug_control[] = {
 295    { "tex",   DEBUG_TEXTURE},
 296    { "state", DEBUG_STATE},
 297    { "blit",  DEBUG_BLIT},
 298    { "mip",   DEBUG_MIPTREE},
 299    { "fall",  DEBUG_PERF},
 300    { "perf",  DEBUG_PERF},
 301    { "bat",   DEBUG_BATCH},
 302    { "pix",   DEBUG_PIXEL},
 303    { "buf",   DEBUG_BUFMGR},
 304    { "reg",   DEBUG_REGION},
 305    { "fbo",   DEBUG_FBO},
 306    { "fs",    DEBUG_WM },
 307    { "sync",  DEBUG_SYNC},
 308    { "dri",   DEBUG_DRI },
 309    { "stats", DEBUG_STATS },
 310    { "wm",    DEBUG_WM },
 311    { "aub",   DEBUG_AUB },
 312    { NULL,    0 }
 313 };
 314
 315
 316 static void
 317 intelInvalidateState(struct gl_context * ctx, GLuint new_state)
 318 {
 319     struct intel_context *intel = intel_context(ctx);
 320
 321     if (ctx->swrast_context)
 322        _swrast_InvalidateState(ctx, new_state);
 323    _vbo_InvalidateState(ctx, new_state);
 324
 325    intel->NewGLState |= new_state;
 326
 327    if (intel->vtbl.invalidate_state)
 328       intel->vtbl.invalidate_state( intel, new_state );
 329 }
 330
 331 void
 332 intel_flush_rendering_to_batch(struct gl_context *ctx)
 333 {
 334    struct intel_context *intel = intel_context(ctx);
 335
 336    if (intel->Fallback)
 337       _swrast_flush(ctx);
 338
 339    INTEL_FIREVERTICES(intel);
 340 }
 341
 342 void
 343 _intel_flush(struct gl_context *ctx, const char *file, int line)
 344 {
 345    struct intel_context *intel = intel_context(ctx);
 346
 347    intel_flush_rendering_to_batch(ctx);
 348
 349    if (intel->batch.used)
 350       _intel_batchbuffer_flush(intel, file, line);
 351 }
 352
 353 static void
 354 intel_glFlush(struct gl_context *ctx)
 355 {
 356    struct intel_context *intel = intel_context(ctx);
 357
 358    intel_flush(ctx);
 359    intel_flush_front(ctx);
 360    if (_mesa_is_front_buffer_drawing(ctx->DrawBuffer))
 361       intel->need_throttle = true;
 362 }
 363
 364 void
 365 intelFinish(struct gl_context * ctx)
 366 {
 367    struct intel_context *intel = intel_context(ctx);
 368
 369    intel_flush(ctx);
 370    intel_flush_front(ctx);
 371
 372    if (intel->batch.last_bo)
 373       drm_intel_bo_wait_rendering(intel->batch.last_bo);
 374 }
 375
 376 void
 377 intelInitDriverFunctions(struct dd_function_table *functions)
 378 {
 379    _mesa_init_driver_functions(functions);
 380
 381    functions->Flush = intel_glFlush;
 382    functions->Finish = intelFinish;
 383    functions->GetString = intelGetString;
 384    functions->UpdateState = intelInvalidateState;
 385
 386    intelInitTextureFuncs(functions);
 387    intelInitTextureImageFuncs(functions);
 388    intelInitTextureSubImageFuncs(functions);
 389    intelInitTextureCopyImageFuncs(functions);
 390    intelInitClearFuncs(functions);
 391    intelInitBufferFuncs(functions);
 392    intelInitPixelFuncs(functions);
 393    intelInitBufferObjectFuncs(functions);
 394    intel_init_syncobj_functions(functions);
 395 }
 396
 397 bool
 398 intelInitContext(struct intel_context *intel,
 399                  int api,
 400                  unsigned major_version,
 401                  unsigned minor_version,
 402                  uint32_t flags,
 403                  const struct gl_config * mesaVis,
 404                  __DRIcontext * driContextPriv,
 405                  void *sharedContextPrivate,
 406                  struct dd_function_table *functions,
 407                  unsigned *dri_ctx_error)
 408 {
 409    struct gl_context *ctx = &intel->ctx;
 410    struct gl_context *shareCtx = (struct gl_context *) sharedContextPrivate;
 411    __DRIscreen *sPriv = driContextPriv->driScreenPriv;
 412    struct intel_screen *intelScreen = sPriv->driverPrivate;
 413    int bo_reuse_mode;
 414
 415    /* Can't rely on invalidate events, fall back to glViewport hack */
 416    if (!driContextPriv->driScreenPriv->dri2.useInvalidate)
 417       functions->Viewport = intel_noninvalidate_viewport;
 418    else
 419       functions->Viewport = intel_viewport;
 420
 421    intel->intelScreen = intelScreen;
 422
 423    if (!_mesa_initialize_context(&intel->ctx, api, mesaVis, shareCtx,
 424                                  functions)) {
 425       *dri_ctx_error = __DRI_CTX_ERROR_NO_MEMORY;
 426       printf("%s: failed to init mesa context\n", __func__);
 427       return false;
 428    }
 429
 430    driContextPriv->driverPrivate = intel;
 431    intel->driContext = driContextPriv;
 432
 433    intel->gen = intelScreen->gen;
 434
 435    const int devID = intelScreen->deviceID;
 436
 437    intel->is_945 = IS_945(devID);
 438
 439    intel->has_swizzling = intel->intelScreen->hw_has_swizzling;
 440
 441    memset(&ctx->TextureFormatSupported,
 442           0, sizeof(ctx->TextureFormatSupported));
 443
 444    driParseConfigFiles(&intel->optionCache, &intelScreen->optionCache,
 445                        sPriv->myNum, "i915");
 446    intel->maxBatchSize = 4096;
 447
 448    /* Estimate the size of the mappable aperture into the GTT.  There's an
 449     * ioctl to get the whole GTT size, but not one to get the mappable subset.
 450     * It turns out it's basically always 256MB, though some ancient hardware
 451     * was smaller.
 452     */
 453    uint32_t gtt_size = 256 * 1024 * 1024;
 454    if (intel->gen == 2)
 455       gtt_size = 128 * 1024 * 1024;
 456
 457    /* We don't want to map two objects such that a memcpy between them would
 458     * just fault one mapping in and then the other over and over forever.  So
 459     * we would need to divide the GTT size by 2.  Additionally, some GTT is
 460     * taken up by things like the framebuffer and the ringbuffer and such, so
 461     * be more conservative.
 462     */
 463    intel->max_gtt_map_object_size = gtt_size / 4;
 464
 465    intel->bufmgr = intelScreen->bufmgr;
 466
 467    bo_reuse_mode = driQueryOptioni(&intel->optionCache, "bo_reuse");
 468    switch (bo_reuse_mode) {
 469    case DRI_CONF_BO_REUSE_DISABLED:
 470       break;
 471    case DRI_CONF_BO_REUSE_ALL:
 472       intel_bufmgr_gem_enable_reuse(intel->bufmgr);
 473       break;
 474    }
 475
 476    ctx->Const.MinLineWidth = 1.0;
 477    ctx->Const.MinLineWidthAA = 1.0;
 478    ctx->Const.MaxLineWidth = 7.0;
 479    ctx->Const.MaxLineWidthAA = 7.0;
 480    ctx->Const.LineWidthGranularity = 0.5;
 481
 482    ctx->Const.MinPointSize = 1.0;
 483    ctx->Const.MinPointSizeAA = 1.0;
 484    ctx->Const.MaxPointSize = 255.0;
 485    ctx->Const.MaxPointSizeAA = 3.0;
 486    ctx->Const.PointSizeGranularity = 1.0;
 487
 488    ctx->Const.StripTextureBorder = GL_TRUE;
 489
 490    /* reinitialize the context point state.
 491     * It depend on constants in __struct gl_contextRec::Const
 492     */
 493    _mesa_init_point(ctx);
 494
 495    ctx->Const.MaxRenderbufferSize = 2048;
 496
 497    _swrast_CreateContext(ctx);
 498    _vbo_CreateContext(ctx);
 499    if (ctx->swrast_context) {
 500       _tnl_CreateContext(ctx);
 501       _swsetup_CreateContext(ctx);
 502
 503       /* Configure swrast to match hardware characteristics: */
 504       _swrast_allow_pixel_fog(ctx, false);
 505       _swrast_allow_vertex_fog(ctx, true);
 506    }
 507
 508    _mesa_meta_init(ctx);
 509
 510    intel->hw_stipple = 1;
 511
 512    intel->RenderIndex = ~0;
 513
 514    intelInitExtensions(ctx);
 515
 516    INTEL_DEBUG = parse_debug_string(getenv("INTEL_DEBUG"), debug_control);
 517    if (INTEL_DEBUG & DEBUG_BUFMGR)
 518       dri_bufmgr_set_debug(intel->bufmgr, true);
 519    if (INTEL_DEBUG & DEBUG_PERF)
 520       intel->perf_debug = true;
 521
 522    if (INTEL_DEBUG & DEBUG_AUB)
 523       drm_intel_bufmgr_gem_set_aub_dump(intel->bufmgr, true);
 524
 525    intel_batchbuffer_init(intel);
 526
 527    intel_fbo_init(intel);
 528
 529    intel->use_early_z = driQueryOptionb(&intel->optionCache, "early_z");
 530
 531    intel->prim.primitive = ~0;
 532
 533    /* Force all software fallbacks */
 534    if (driQueryOptionb(&intel->optionCache, "no_rast")) {
 535       fprintf(stderr, "disabling 3D rasterization\n");
 536       intel->no_rast = 1;
 537    }
 538
 539    if (driQueryOptionb(&intel->optionCache, "always_flush_batch")) {
 540       fprintf(stderr, "flushing batchbuffer before/after each draw call\n");
 541       intel->always_flush_batch = 1;
 542    }
 543
 544    if (driQueryOptionb(&intel->optionCache, "always_flush_cache")) {
 545       fprintf(stderr, "flushing GPU caches before/after each draw call\n");
 546       intel->always_flush_cache = 1;
 547    }
 548
 549    if (driQueryOptionb(&intel->optionCache, "disable_throttling")) {
 550       fprintf(stderr, "disabling flush throttling\n");
 551       intel->disable_throttling = 1;
 552    }
 553
 554    return true;
 555 }
 556
 557 void
 558 intelDestroyContext(__DRIcontext * driContextPriv)
 559 {
 560    struct intel_context *intel =
 561       (struct intel_context *) driContextPriv->driverPrivate;
 562    struct gl_context *ctx = &intel->ctx;
 563
 564    assert(intel);               /* should never be null */
 565    if (intel) {
 566       INTEL_FIREVERTICES(intel);
 567
 568       /* Dump a final BMP in case the application doesn't call SwapBuffers */
 569       if (INTEL_DEBUG & DEBUG_AUB) {
 570          intel_batchbuffer_flush(intel);
 571          aub_dump_bmp(&intel->ctx);
 572       }
 573
 574       _mesa_meta_free(&intel->ctx);
 575
 576       intel->vtbl.destroy(intel);
 577
 578       if (ctx->swrast_context) {
 579          _swsetup_DestroyContext(&intel->ctx);
 580          _tnl_DestroyContext(&intel->ctx);
 581       }
 582       _vbo_DestroyContext(&intel->ctx);
 583
 584       if (ctx->swrast_context)
 585          _swrast_DestroyContext(&intel->ctx);
 586       intel->Fallback = 0x0;      /* don't call _swrast_Flush later */
 587
 588       intel_batchbuffer_free(intel);
 589
 590       free(intel->prim.vb);
 591       intel->prim.vb = NULL;
 592       drm_intel_bo_unreference(intel->prim.vb_bo);
 593       intel->prim.vb_bo = NULL;
 594       drm_intel_bo_unreference(intel->first_post_swapbuffers_batch);
 595       intel->first_post_swapbuffers_batch = NULL;
 596
 597       driDestroyOptionCache(&intel->optionCache);
 598
 599       /* free the Mesa context */
 600       _mesa_free_context_data(&intel->ctx);
 601
 602       _math_matrix_dtr(&intel->ViewportMatrix);
 603
 604       ralloc_free(intel);
 605       driContextPriv->driverPrivate = NULL;
 606    }
 607 }
 608
 609 GLboolean
 610 intelUnbindContext(__DRIcontext * driContextPriv)
 611 {
 612    /* Unset current context and dispath table */
 613    _mesa_make_current(NULL, NULL, NULL);
 614
 615    return true;
 616 }
 617
 618 GLboolean
 619 intelMakeCurrent(__DRIcontext * driContextPriv,
 620                  __DRIdrawable * driDrawPriv,
 621                  __DRIdrawable * driReadPriv)
 622 {
 623    struct intel_context *intel;
 624    GET_CURRENT_CONTEXT(curCtx);
 625
 626    if (driContextPriv)
 627       intel = (struct intel_context *) driContextPriv->driverPrivate;
 628    else
 629       intel = NULL;
 630
 631    /* According to the glXMakeCurrent() man page: "Pending commands to
 632     * the previous context, if any, are flushed before it is released."
 633     * But only flush if we're actually changing contexts.
 634     */
 635    if (intel_context(curCtx) && intel_context(curCtx) != intel) {
 636       _mesa_flush(curCtx);
 637    }
 638
 639    if (driContextPriv) {
 640       struct gl_context *ctx = &intel->ctx;
 641       struct gl_framebuffer *fb, *readFb;
 642
 643       if (driDrawPriv == NULL && driReadPriv == NULL) {
 644          fb = _mesa_get_incomplete_framebuffer();
 645          readFb = _mesa_get_incomplete_framebuffer();
 646       } else {
 647          fb = driDrawPriv->driverPrivate;
 648          readFb = driReadPriv->driverPrivate;
 649          driContextPriv->dri2.draw_stamp = driDrawPriv->dri2.stamp - 1;
 650          driContextPriv->dri2.read_stamp = driReadPriv->dri2.stamp - 1;
 651       }
 652
 653       intel_prepare_render(intel);
 654       _mesa_make_current(ctx, fb, readFb);
 655
 656       /* We do this in intel_prepare_render() too, but intel->ctx.DrawBuffer
 657        * is NULL at that point.  We can't call _mesa_makecurrent()
 658        * first, since we need the buffer size for the initial
 659        * viewport.  So just call intel_draw_buffer() again here. */
 660       intel_draw_buffer(ctx);
 661    }
 662    else {
 663       _mesa_make_current(NULL, NULL, NULL);
 664    }
 665
 666    return true;
 667 }
 668
 669 /**
 670  * \brief Query DRI2 to obtain a DRIdrawable's buffers.
 671  *
 672  * To determine which DRI buffers to request, examine the renderbuffers
 673  * attached to the drawable's framebuffer. Then request the buffers with
 674  * DRI2GetBuffers() or DRI2GetBuffersWithFormat().
 675  *
 676  * This is called from intel_update_renderbuffers().
 677  *
 678  * \param drawable      Drawable whose buffers are queried.
 679  * \param buffers       [out] List of buffers returned by DRI2 query.
 680  * \param buffer_count  [out] Number of buffers returned.
 681  *
 682  * \see intel_update_renderbuffers()
 683  * \see DRI2GetBuffers()
 684  * \see DRI2GetBuffersWithFormat()
 685  */
 686 static void
 687 intel_query_dri2_buffers(struct intel_context *intel,
 688                          __DRIdrawable *drawable,
 689                          __DRIbuffer **buffers,
 690                          int *buffer_count)
 691 {
 692    __DRIscreen *screen = intel->intelScreen->driScrnPriv;
 693    struct gl_framebuffer *fb = drawable->driverPrivate;
 694    int i = 0;
 695    unsigned attachments[8];
 696
 697    struct intel_renderbuffer *front_rb;
 698    struct intel_renderbuffer *back_rb;
 699
 700    front_rb = intel_get_renderbuffer(fb, BUFFER_FRONT_LEFT);
 701    back_rb = intel_get_renderbuffer(fb, BUFFER_BACK_LEFT);
 702
 703    memset(attachments, 0, sizeof(attachments));
 704    if ((_mesa_is_front_buffer_drawing(fb) ||
 705         _mesa_is_front_buffer_reading(fb) ||
 706         !back_rb) && front_rb) {
 707       /* If a fake front buffer is in use, then querying for
 708        * __DRI_BUFFER_FRONT_LEFT will cause the server to copy the image from
 709        * the real front buffer to the fake front buffer.  So before doing the
 710        * query, we need to make sure all the pending drawing has landed in the
 711        * real front buffer.
 712        */
 713       intel_flush(&intel->ctx);
 714       intel_flush_front(&intel->ctx);
 715
 716       attachments[i++] = __DRI_BUFFER_FRONT_LEFT;
 717       attachments[i++] = intel_bits_per_pixel(front_rb);
 718    } else if (front_rb && intel->front_buffer_dirty) {
 719       /* We have pending front buffer rendering, but we aren't querying for a
 720        * front buffer.  If the front buffer we have is a fake front buffer,
 721        * the X server is going to throw it away when it processes the query.
 722        * So before doing the query, make sure all the pending drawing has
 723        * landed in the real front buffer.
 724        */
 725       intel_flush(&intel->ctx);
 726       intel_flush_front(&intel->ctx);
 727    }
 728
 729    if (back_rb) {
 730       attachments[i++] = __DRI_BUFFER_BACK_LEFT;
 731       attachments[i++] = intel_bits_per_pixel(back_rb);
 732    }
 733
 734    assert(i <= ARRAY_SIZE(attachments));
 735
 736    *buffers = screen->dri2.loader->getBuffersWithFormat(drawable,
 737                                                         &drawable->w,
 738                                                         &drawable->h,
 739                                                         attachments, i / 2,
 740                                                         buffer_count,
 741                                                         drawable->loaderPrivate);
 742 }
 743
 744 /**
 745  * \brief Assign a DRI buffer's DRM region to a renderbuffer.
 746  *
 747  * This is called from intel_update_renderbuffers().
 748  *
 749  * \par Note:
 750  *    DRI buffers whose attachment point is DRI2BufferStencil or
 751  *    DRI2BufferDepthStencil are handled as special cases.
 752  *
 753  * \param buffer_name is a human readable name, such as "dri2 front buffer",
 754  *        that is passed to intel_region_alloc_for_handle().
 755  *
 756  * \see intel_update_renderbuffers()
 757  * \see intel_region_alloc_for_handle()
 758  */
 759 static void
 760 intel_process_dri2_buffer(struct intel_context *intel,
 761                           __DRIdrawable *drawable,
 762                           __DRIbuffer *buffer,
 763                           struct intel_renderbuffer *rb,
 764                           const char *buffer_name)
 765 {
 766    struct intel_region *region = NULL;
 767
 768    if (!rb)
 769       return;
 770
 771    /* We try to avoid closing and reopening the same BO name, because the first
 772     * use of a mapping of the buffer involves a bunch of page faulting which is
 773     * moderately expensive.
 774     */
 775    if (rb->mt &&
 776        rb->mt->region &&
 777        rb->mt->region->name == buffer->name)
 778       return;
 779
 780    if (unlikely(INTEL_DEBUG & DEBUG_DRI)) {
 781       fprintf(stderr,
 782               "attaching buffer %d, at %d, cpp %d, pitch %d\n",
 783               buffer->name, buffer->attachment,
 784               buffer->cpp, buffer->pitch);
 785    }
 786
 787    intel_miptree_release(&rb->mt);
 788    region = intel_region_alloc_for_handle(intel->intelScreen,
 789                                           buffer->cpp,
 790                                           drawable->w,
 791                                           drawable->h,
 792                                           buffer->pitch,
 793                                           buffer->name,
 794                                           buffer_name);
 795    if (!region)
 796       return;
 797
 798    rb->mt = intel_miptree_create_for_dri2_buffer(intel,
 799                                                  buffer->attachment,
 800                                                  intel_rb_format(rb),
 801                                                  region);
 802    intel_region_release(&region);
 803 }
 804
 805 /**
 806  * \brief Query DRI Image loader to obtain a DRIdrawable's buffers.
 807  *
 808  * To determine which DRI buffers to request, examine the renderbuffers
 809  * attached to the drawable's framebuffer. Then request the buffers with
 810  * dri3
 811  *
 812  * This is called from intel_update_renderbuffers().
 813  *
 814  * \param drawable      Drawable whose buffers are queried.
 815  * \param buffers       [out] List of buffers returned by DRI2 query.
 816  * \param buffer_count  [out] Number of buffers returned.
 817  *
 818  * \see intel_update_renderbuffers()
 819  */
 820
 821 static void
 822 intel_update_image_buffer(struct intel_context *intel,
 823                           __DRIdrawable *drawable,
 824                           struct intel_renderbuffer *rb,
 825                           __DRIimage *buffer,
 826                           enum __DRIimageBufferMask buffer_type)
 827 {
 828    struct intel_region *region = buffer->region;
 829
 830    if (!rb || !region)
 831       return;
 832
 833    unsigned num_samples = rb->Base.Base.NumSamples;
 834
 835    if (rb->mt &&
 836        rb->mt->region &&
 837        rb->mt->region == region)
 838       return;
 839
 840    intel_miptree_release(&rb->mt);
 841    rb->mt = intel_miptree_create_for_image_buffer(intel,
 842                                                   buffer_type,
 843                                                   intel_rb_format(rb),
 844                                                   num_samples,
 845                                                   region);
 846 }
 847
 848
 849 static void
 850 intel_update_image_buffers(struct intel_context *intel, __DRIdrawable *drawable)
 851 {
 852    struct gl_framebuffer *fb = drawable->driverPrivate;
 853    __DRIscreen *screen = intel->intelScreen->driScrnPriv;
 854    struct intel_renderbuffer *front_rb;
 855    struct intel_renderbuffer *back_rb;
 856    struct __DRIimageList images;
 857    unsigned int format;
 858    uint32_t buffer_mask = 0;
 859
 860    front_rb = intel_get_renderbuffer(fb, BUFFER_FRONT_LEFT);
 861    back_rb = intel_get_renderbuffer(fb, BUFFER_BACK_LEFT);
 862
 863    if (back_rb)
 864       format = intel_rb_format(back_rb);
 865    else if (front_rb)
 866       format = intel_rb_format(front_rb);
 867    else
 868       return;
 869
 870    if (front_rb && (_mesa_is_front_buffer_drawing(fb) ||
 871                     _mesa_is_front_buffer_reading(fb) || !back_rb)) {
 872       buffer_mask |= __DRI_IMAGE_BUFFER_FRONT;
 873    }
 874
 875    if (back_rb)
 876       buffer_mask |= __DRI_IMAGE_BUFFER_BACK;
 877
 878    (*screen->image.loader->getBuffers) (drawable,
 879                                         driGLFormatToImageFormat(format),
 880                                         &drawable->dri2.stamp,
 881                                         drawable->loaderPrivate,
 882                                         buffer_mask,
 883                                         &images);
 884
 885    if (images.image_mask & __DRI_IMAGE_BUFFER_FRONT) {
 886       drawable->w = images.front->width;
 887       drawable->h = images.front->height;
 888       intel_update_image_buffer(intel,
 889                                 drawable,
 890                                 front_rb,
 891                                 images.front,
 892                                 __DRI_IMAGE_BUFFER_FRONT);
 893    }
 894    if (images.image_mask & __DRI_IMAGE_BUFFER_BACK) {
 895       drawable->w = images.back->width;
 896       drawable->h = images.back->height;
 897       intel_update_image_buffer(intel,
 898                                 drawable,
 899                                 back_rb,
 900                                 images.back,
 901                                 __DRI_IMAGE_BUFFER_BACK);
 902    }
 903 }