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/ralloc.h"
  60
  61 int INTEL_DEBUG = (0);
  62
  63 const char *const i915_vendor_string = "Intel Open Source Technology Center";
  64
  65 const char *
  66 i915_get_renderer_string(unsigned deviceID)
  67 {
  68    const char *chipset;
  69    static char buffer[128];
  70
  71    switch (deviceID) {
  72 #undef CHIPSET
  73 #define CHIPSET(id, symbol, str) case id: chipset = str; break;
  74 #include "pci_ids/i915_pci_ids.h"
  75    default:
  76       chipset = "Unknown Intel Chipset";
  77       break;
  78    }
  79
  80    (void) driGetRendererString(buffer, chipset, 0);
  81    return buffer;
  82 }
  83
  84 static const GLubyte *
  85 intelGetString(struct gl_context * ctx, GLenum name)
  86 {
  87    const struct intel_context *const intel = intel_context(ctx);
  88
  89    switch (name) {
  90    case GL_VENDOR:
  91       return (GLubyte *) i915_vendor_string;
  92
  93    case GL_RENDERER:
  94       return
  95          (GLubyte *) i915_get_renderer_string(intel->intelScreen->deviceID);
  96
  97    default:
  98       return NULL;
  99    }
 100 }
 101
 102 #define flushFront(screen)      ((screen)->image.loader ? (screen)->image.loader->flushFrontBuffer : (screen)->dri2.loader->flushFrontBuffer)
 103
 104 static void
 105 intel_flush_front(struct gl_context *ctx)
 106 {
 107    struct intel_context *intel = intel_context(ctx);
 108     __DRIcontext *driContext = intel->driContext;
 109     __DRIdrawable *driDrawable = driContext->driDrawablePriv;
 110     __DRIscreen *const screen = intel->intelScreen->driScrnPriv;
 111
 112     if (intel->front_buffer_dirty && _mesa_is_winsys_fbo(ctx->DrawBuffer)) {
 113       if (flushFront(screen) &&
 114           driDrawable &&
 115           driDrawable->loaderPrivate) {
 116          flushFront(screen)(driDrawable, driDrawable->loaderPrivate);
 117
 118          /* We set the dirty bit in intel_prepare_render() if we're
 119           * front buffer rendering once we get there.
 120           */
 121          intel->front_buffer_dirty = false;
 122       }
 123    }
 124 }
 125
 126 static void
 127 intel_update_image_buffers(struct intel_context *intel, __DRIdrawable *drawable);
 128
 129 static unsigned
 130 intel_bits_per_pixel(const struct intel_renderbuffer *rb)
 131 {
 132    return _mesa_get_format_bytes(intel_rb_format(rb)) * 8;
 133 }
 134
 135 static void
 136 intel_query_dri2_buffers(struct intel_context *intel,
 137                          __DRIdrawable *drawable,
 138                          __DRIbuffer **buffers,
 139                          int *count);
 140
 141 static void
 142 intel_process_dri2_buffer(struct intel_context *intel,
 143                           __DRIdrawable *drawable,
 144                           __DRIbuffer *buffer,
 145                           struct intel_renderbuffer *rb,
 146                           const char *buffer_name);
 147
 148 static void
 149 intel_update_dri2_buffers(struct intel_context *intel, __DRIdrawable *drawable)
 150 {
 151    __DRIbuffer *buffers = NULL;
 152    int i, count;
 153    const char *region_name;
 154    struct intel_renderbuffer *rb;
 155    struct gl_framebuffer *fb = drawable->driverPrivate;
 156
 157    intel_query_dri2_buffers(intel, drawable, &buffers, &count);
 158
 159    if (buffers == NULL)
 160       return;
 161
 162    for (i = 0; i < count; i++) {
 163       switch (buffers[i].attachment) {
 164       case __DRI_BUFFER_FRONT_LEFT:
 165          rb = intel_get_renderbuffer(fb, BUFFER_FRONT_LEFT);
 166          region_name = "dri2 front buffer";
 167          break;
 168
 169       case __DRI_BUFFER_FAKE_FRONT_LEFT:
 170          rb = intel_get_renderbuffer(fb, BUFFER_FRONT_LEFT);
 171          region_name = "dri2 fake front buffer";
 172          break;
 173
 174       case __DRI_BUFFER_BACK_LEFT:
 175          rb = intel_get_renderbuffer(fb, BUFFER_BACK_LEFT);
 176          region_name = "dri2 back buffer";
 177          break;
 178
 179       case __DRI_BUFFER_DEPTH:
 180       case __DRI_BUFFER_HIZ:
 181       case __DRI_BUFFER_DEPTH_STENCIL:
 182       case __DRI_BUFFER_STENCIL:
 183       case __DRI_BUFFER_ACCUM:
 184       default:
 185          fprintf(stderr,
 186                  "unhandled buffer attach event, attachment type %d\n",
 187                  buffers[i].attachment);
 188          return;
 189       }
 190
 191       intel_process_dri2_buffer(intel, drawable, &buffers[i], rb, region_name);
 192    }
 193 }
 194
 195 void
 196 intel_update_renderbuffers(__DRIcontext *context, __DRIdrawable *drawable)
 197 {
 198    struct intel_context *intel = context->driverPrivate;
 199    __DRIscreen *screen = intel->intelScreen->driScrnPriv;
 200
 201    /* Set this up front, so that in case our buffers get invalidated
 202     * while we're getting new buffers, we don't clobber the stamp and
 203     * thus ignore the invalidate. */
 204    drawable->lastStamp = drawable->dri2.stamp;
 205
 206    if (unlikely(INTEL_DEBUG & DEBUG_DRI))
 207       fprintf(stderr, "enter %s, drawable %p\n", __func__, drawable);
 208
 209    if (screen->image.loader)
 210       intel_update_image_buffers(intel, drawable);
 211    else
 212       intel_update_dri2_buffers(intel, drawable);
 213
 214    driUpdateFramebufferSize(&intel->ctx, drawable);
 215 }
 216
 217 /**
 218  * intel_prepare_render should be called anywhere that curent read/drawbuffer
 219  * state is required.
 220  */
 221 void
 222 intel_prepare_render(struct intel_context *intel)
 223 {
 224    __DRIcontext *driContext = intel->driContext;
 225    __DRIdrawable *drawable;
 226
 227    drawable = driContext->driDrawablePriv;
 228    if (drawable && drawable->dri2.stamp != driContext->dri2.draw_stamp) {
 229       if (drawable->lastStamp != drawable->dri2.stamp)
 230          intel_update_renderbuffers(driContext, drawable);
 231       intel_draw_buffer(&intel->ctx);
 232       driContext->dri2.draw_stamp = drawable->dri2.stamp;
 233    }
 234
 235    drawable = driContext->driReadablePriv;
 236    if (drawable && drawable->dri2.stamp != driContext->dri2.read_stamp) {
 237       if (drawable->lastStamp != drawable->dri2.stamp)
 238          intel_update_renderbuffers(driContext, drawable);
 239       driContext->dri2.read_stamp = drawable->dri2.stamp;
 240    }
 241
 242    /* If we're currently rendering to the front buffer, the rendering
 243     * that will happen next will probably dirty the front buffer.  So
 244     * mark it as dirty here.
 245     */
 246    if (intel->is_front_buffer_rendering)
 247       intel->front_buffer_dirty = true;
 248
 249    /* Wait for the swapbuffers before the one we just emitted, so we
 250     * don't get too many swaps outstanding for apps that are GPU-heavy
 251     * but not CPU-heavy.
 252     *
 253     * We're using intelDRI2Flush (called from the loader before
 254     * swapbuffer) and glFlush (for front buffer rendering) as the
 255     * indicator that a frame is done and then throttle when we get
 256     * here as we prepare to render the next frame.  At this point for
 257     * round trips for swap/copy and getting new buffers are done and
 258     * we'll spend less time waiting on the GPU.
 259     *
 260     * Unfortunately, we don't have a handle to the batch containing
 261     * the swap, and getting our hands on that doesn't seem worth it,
 262     * so we just us the first batch we emitted after the last swap.
 263     */
 264    if (intel->need_throttle && intel->first_post_swapbuffers_batch) {
 265       if (!intel->disable_throttling)
 266          drm_intel_bo_wait_rendering(intel->first_post_swapbuffers_batch);
 267       drm_intel_bo_unreference(intel->first_post_swapbuffers_batch);
 268       intel->first_post_swapbuffers_batch = NULL;
 269       intel->need_throttle = false;
 270    }
 271 }
 272
 273 static void
 274 intel_noninvalidate_viewport(struct gl_context *ctx)
 275 {
 276     struct intel_context *intel = intel_context(ctx);
 277     __DRIcontext *driContext = intel->driContext;
 278
 279     intelCalcViewport(ctx);
 280
 281     if (_mesa_is_winsys_fbo(ctx->DrawBuffer)) {
 282        dri2InvalidateDrawable(driContext->driDrawablePriv);
 283        dri2InvalidateDrawable(driContext->driReadablePriv);
 284     }
 285 }
 286
 287 static void
 288 intel_viewport(struct gl_context *ctx)
 289 {
 290     intelCalcViewport(ctx);
 291 }
 292
 293 static const struct dri_debug_control debug_control[] = {
 294    { "tex",   DEBUG_TEXTURE},
 295    { "state", DEBUG_STATE},
 296    { "blit",  DEBUG_BLIT},
 297    { "mip",   DEBUG_MIPTREE},
 298    { "fall",  DEBUG_PERF},
 299    { "perf",  DEBUG_PERF},
 300    { "bat",   DEBUG_BATCH},
 301    { "pix",   DEBUG_PIXEL},
 302    { "buf",   DEBUG_BUFMGR},
 303    { "reg",   DEBUG_REGION},
 304    { "fbo",   DEBUG_FBO},
 305    { "fs",    DEBUG_WM },
 306    { "sync",  DEBUG_SYNC},
 307    { "dri",   DEBUG_DRI },
 308    { "stats", DEBUG_STATS },
 309    { "wm",    DEBUG_WM },
 310    { "aub",   DEBUG_AUB },
 311    { NULL,    0 }
 312 };
 313
 314
 315 static void
 316 intelInvalidateState(struct gl_context * ctx, GLuint new_state)
 317 {
 318     struct intel_context *intel = intel_context(ctx);
 319
 320     if (ctx->swrast_context)
 321        _swrast_InvalidateState(ctx, new_state);
 322    _vbo_InvalidateState(ctx, new_state);
 323
 324    intel->NewGLState |= new_state;
 325
 326    if (intel->vtbl.invalidate_state)
 327       intel->vtbl.invalidate_state( intel, new_state );
 328 }
 329
 330 void
 331 intel_flush_rendering_to_batch(struct gl_context *ctx)
 332 {
 333    struct intel_context *intel = intel_context(ctx);
 334
 335    if (intel->Fallback)
 336       _swrast_flush(ctx);
 337
 338    INTEL_FIREVERTICES(intel);
 339 }
 340
 341 void
 342 _intel_flush(struct gl_context *ctx, const char *file, int line)
 343 {
 344    struct intel_context *intel = intel_context(ctx);
 345
 346    intel_flush_rendering_to_batch(ctx);
 347
 348    if (intel->batch.used)
 349       _intel_batchbuffer_flush(intel, file, line);
 350 }
 351
 352 static void
 353 intel_glFlush(struct gl_context *ctx)
 354 {
 355    struct intel_context *intel = intel_context(ctx);
 356
 357    intel_flush(ctx);
 358    intel_flush_front(ctx);
 359    if (intel->is_front_buffer_rendering)
 360       intel->need_throttle = true;
 361 }
 362
 363 void
 364 intelFinish(struct gl_context * ctx)
 365 {
 366    struct intel_context *intel = intel_context(ctx);
 367
 368    intel_flush(ctx);
 369    intel_flush_front(ctx);
 370
 371    if (intel->batch.last_bo)
 372       drm_intel_bo_wait_rendering(intel->batch.last_bo);
 373 }
 374
 375 void
 376 intelInitDriverFunctions(struct dd_function_table *functions)
 377 {
 378    _mesa_init_driver_functions(functions);
 379
 380    functions->Flush = intel_glFlush;
 381    functions->Finish = intelFinish;
 382    functions->GetString = intelGetString;
 383    functions->UpdateState = intelInvalidateState;
 384
 385    intelInitTextureFuncs(functions);
 386    intelInitTextureImageFuncs(functions);
 387    intelInitTextureSubImageFuncs(functions);
 388    intelInitTextureCopyImageFuncs(functions);
 389    intelInitClearFuncs(functions);
 390    intelInitBufferFuncs(functions);
 391    intelInitPixelFuncs(functions);
 392    intelInitBufferObjectFuncs(functions);
 393    intel_init_syncobj_functions(functions);
 394 }
 395
 396 bool
 397 intelInitContext(struct intel_context *intel,
 398                  int api,
 399                  unsigned major_version,
 400                  unsigned minor_version,
 401                  uint32_t flags,
 402                  const struct gl_config * mesaVis,
 403                  __DRIcontext * driContextPriv,
 404                  void *sharedContextPrivate,
 405                  struct dd_function_table *functions,
 406                  unsigned *dri_ctx_error)
 407 {
 408    struct gl_context *ctx = &intel->ctx;
 409    struct gl_context *shareCtx = (struct gl_context *) sharedContextPrivate;
 410    __DRIscreen *sPriv = driContextPriv->driScreenPriv;
 411    struct intel_screen *intelScreen = sPriv->driverPrivate;
 412    int bo_reuse_mode;
 413
 414    /* Can't rely on invalidate events, fall back to glViewport hack */
 415    if (!driContextPriv->driScreenPriv->dri2.useInvalidate)
 416       functions->Viewport = intel_noninvalidate_viewport;
 417    else
 418       functions->Viewport = intel_viewport;
 419
 420    intel->intelScreen = intelScreen;
 421
 422    if (!_mesa_initialize_context(&intel->ctx, api, mesaVis, shareCtx,
 423                                  functions)) {
 424       *dri_ctx_error = __DRI_CTX_ERROR_NO_MEMORY;
 425       printf("%s: failed to init mesa context\n", __func__);
 426       return false;
 427    }
 428
 429    driContextPriv->driverPrivate = intel;
 430    intel->driContext = driContextPriv;
 431
 432    intel->gen = intelScreen->gen;
 433
 434    const int devID = intelScreen->deviceID;
 435
 436    intel->is_945 = IS_945(devID);
 437
 438    intel->has_swizzling = intel->intelScreen->hw_has_swizzling;
 439
 440    memset(&ctx->TextureFormatSupported,
 441           0, sizeof(ctx->TextureFormatSupported));
 442
 443    driParseConfigFiles(&intel->optionCache, &intelScreen->optionCache,
 444                        sPriv->myNum, "i915");
 445    intel->maxBatchSize = 4096;
 446
 447    /* Estimate the size of the mappable aperture into the GTT.  There's an
 448     * ioctl to get the whole GTT size, but not one to get the mappable subset.
 449     * It turns out it's basically always 256MB, though some ancient hardware
 450     * was smaller.
 451     */
 452    uint32_t gtt_size = 256 * 1024 * 1024;
 453    if (intel->gen == 2)
 454       gtt_size = 128 * 1024 * 1024;
 455
 456    /* We don't want to map two objects such that a memcpy between them would
 457     * just fault one mapping in and then the other over and over forever.  So
 458     * we would need to divide the GTT size by 2.  Additionally, some GTT is
 459     * taken up by things like the framebuffer and the ringbuffer and such, so
 460     * be more conservative.
 461     */
 462    intel->max_gtt_map_object_size = gtt_size / 4;
 463
 464    intel->bufmgr = intelScreen->bufmgr;
 465
 466    bo_reuse_mode = driQueryOptioni(&intel->optionCache, "bo_reuse");
 467    switch (bo_reuse_mode) {
 468    case DRI_CONF_BO_REUSE_DISABLED:
 469       break;
 470    case DRI_CONF_BO_REUSE_ALL:
 471       intel_bufmgr_gem_enable_reuse(intel->bufmgr);
 472       break;
 473    }
 474
 475    ctx->Const.MinLineWidth = 1.0;
 476    ctx->Const.MinLineWidthAA = 1.0;
 477    ctx->Const.MaxLineWidth = 5.0;
 478    ctx->Const.MaxLineWidthAA = 5.0;
 479    ctx->Const.LineWidthGranularity = 0.5;
 480
 481    ctx->Const.MinPointSize = 1.0;
 482    ctx->Const.MinPointSizeAA = 1.0;
 483    ctx->Const.MaxPointSize = 255.0;
 484    ctx->Const.MaxPointSizeAA = 3.0;
 485    ctx->Const.PointSizeGranularity = 1.0;
 486
 487    ctx->Const.StripTextureBorder = GL_TRUE;
 488
 489    /* reinitialize the context point state.
 490     * It depend on constants in __struct gl_contextRec::Const
 491     */
 492    _mesa_init_point(ctx);
 493
 494    ctx->Const.MaxRenderbufferSize = 2048;
 495
 496    _swrast_CreateContext(ctx);
 497    _vbo_CreateContext(ctx);
 498    if (ctx->swrast_context) {
 499       _tnl_CreateContext(ctx);
 500       _swsetup_CreateContext(ctx);
 501
 502       /* Configure swrast to match hardware characteristics: */
 503       _swrast_allow_pixel_fog(ctx, false);
 504       _swrast_allow_vertex_fog(ctx, true);
 505    }
 506
 507    _mesa_meta_init(ctx);
 508
 509    intel->hw_stipple = 1;
 510
 511    intel->RenderIndex = ~0;
 512
 513    intelInitExtensions(ctx);
 514
 515    INTEL_DEBUG = driParseDebugString(getenv("INTEL_DEBUG"), debug_control);
 516    if (INTEL_DEBUG & DEBUG_BUFMGR)
 517       dri_bufmgr_set_debug(intel->bufmgr, true);
 518    if (INTEL_DEBUG & DEBUG_PERF)
 519       intel->perf_debug = true;
 520
 521    if (INTEL_DEBUG & DEBUG_AUB)
 522       drm_intel_bufmgr_gem_set_aub_dump(intel->bufmgr, true);
 523
 524    intel_batchbuffer_init(intel);
 525
 526    intel_fbo_init(intel);
 527
 528    intel->use_early_z = driQueryOptionb(&intel->optionCache, "early_z");
 529
 530    intel->prim.primitive = ~0;
 531
 532    /* Force all software fallbacks */
 533    if (driQueryOptionb(&intel->optionCache, "no_rast")) {
 534       fprintf(stderr, "disabling 3D rasterization\n");
 535       intel->no_rast = 1;
 536    }
 537
 538    if (driQueryOptionb(&intel->optionCache, "always_flush_batch")) {
 539       fprintf(stderr, "flushing batchbuffer before/after each draw call\n");
 540       intel->always_flush_batch = 1;
 541    }
 542
 543    if (driQueryOptionb(&intel->optionCache, "always_flush_cache")) {
 544       fprintf(stderr, "flushing GPU caches before/after each draw call\n");
 545       intel->always_flush_cache = 1;
 546    }
 547
 548    if (driQueryOptionb(&intel->optionCache, "disable_throttling")) {
 549       fprintf(stderr, "disabling flush throttling\n");
 550       intel->disable_throttling = 1;
 551    }
 552
 553    return true;
 554 }
 555
 556 void
 557 intelDestroyContext(__DRIcontext * driContextPriv)
 558 {
 559    struct intel_context *intel =
 560       (struct intel_context *) driContextPriv->driverPrivate;
 561    struct gl_context *ctx = &intel->ctx;
 562
 563    assert(intel);               /* should never be null */
 564    if (intel) {
 565       INTEL_FIREVERTICES(intel);
 566
 567       /* Dump a final BMP in case the application doesn't call SwapBuffers */
 568       if (INTEL_DEBUG & DEBUG_AUB) {
 569          intel_batchbuffer_flush(intel);
 570          aub_dump_bmp(&intel->ctx);
 571       }
 572
 573       _mesa_meta_free(&intel->ctx);
 574
 575       intel->vtbl.destroy(intel);
 576
 577       if (ctx->swrast_context) {
 578          _swsetup_DestroyContext(&intel->ctx);
 579          _tnl_DestroyContext(&intel->ctx);
 580       }
 581       _vbo_DestroyContext(&intel->ctx);
 582
 583       if (ctx->swrast_context)
 584          _swrast_DestroyContext(&intel->ctx);
 585       intel->Fallback = 0x0;      /* don't call _swrast_Flush later */
 586
 587       intel_batchbuffer_free(intel);
 588
 589       free(intel->prim.vb);
 590       intel->prim.vb = NULL;
 591       drm_intel_bo_unreference(intel->prim.vb_bo);
 592       intel->prim.vb_bo = NULL;
 593       drm_intel_bo_unreference(intel->first_post_swapbuffers_batch);
 594       intel->first_post_swapbuffers_batch = NULL;
 595
 596       driDestroyOptionCache(&intel->optionCache);
 597
 598       /* free the Mesa context */
 599       _mesa_free_context_data(&intel->ctx);
 600
 601       _math_matrix_dtr(&intel->ViewportMatrix);
 602
 603       ralloc_free(intel);
 604       driContextPriv->driverPrivate = NULL;
 605    }
 606 }
 607
 608 GLboolean
 609 intelUnbindContext(__DRIcontext * driContextPriv)
 610 {
 611    /* Unset current context and dispath table */
 612    _mesa_make_current(NULL, NULL, NULL);
 613
 614    return true;
 615 }
 616
 617 GLboolean
 618 intelMakeCurrent(__DRIcontext * driContextPriv,
 619                  __DRIdrawable * driDrawPriv,
 620                  __DRIdrawable * driReadPriv)
 621 {
 622    struct intel_context *intel;
 623    GET_CURRENT_CONTEXT(curCtx);
 624
 625    if (driContextPriv)
 626       intel = (struct intel_context *) driContextPriv->driverPrivate;
 627    else
 628       intel = NULL;
 629
 630    /* According to the glXMakeCurrent() man page: "Pending commands to
 631     * the previous context, if any, are flushed before it is released."
 632     * But only flush if we're actually changing contexts.
 633     */
 634    if (intel_context(curCtx) && intel_context(curCtx) != intel) {
 635       _mesa_flush(curCtx);
 636    }
 637
 638    if (driContextPriv) {
 639       struct gl_context *ctx = &intel->ctx;
 640       struct gl_framebuffer *fb, *readFb;
 641
 642       if (driDrawPriv == NULL && driReadPriv == NULL) {
 643          fb = _mesa_get_incomplete_framebuffer();
 644          readFb = _mesa_get_incomplete_framebuffer();
 645       } else {
 646          fb = driDrawPriv->driverPrivate;
 647          readFb = driReadPriv->driverPrivate;
 648          driContextPriv->dri2.draw_stamp = driDrawPriv->dri2.stamp - 1;
 649          driContextPriv->dri2.read_stamp = driReadPriv->dri2.stamp - 1;
 650       }
 651
 652       intel_prepare_render(intel);
 653       _mesa_make_current(ctx, fb, readFb);
 654
 655       /* We do this in intel_prepare_render() too, but intel->ctx.DrawBuffer
 656        * is NULL at that point.  We can't call _mesa_makecurrent()
 657        * first, since we need the buffer size for the initial
 658        * viewport.  So just call intel_draw_buffer() again here. */
 659       intel_draw_buffer(ctx);
 660    }
 661    else {
 662       _mesa_make_current(NULL, NULL, NULL);
 663    }
 664
 665    return true;
 666 }
 667
 668 /**
 669  * \brief Query DRI2 to obtain a DRIdrawable's buffers.
 670  *
 671  * To determine which DRI buffers to request, examine the renderbuffers
 672  * attached to the drawable's framebuffer. Then request the buffers with
 673  * DRI2GetBuffers() or DRI2GetBuffersWithFormat().
 674  *
 675  * This is called from intel_update_renderbuffers().
 676  *
 677  * \param drawable      Drawable whose buffers are queried.
 678  * \param buffers       [out] List of buffers returned by DRI2 query.
 679  * \param buffer_count  [out] Number of buffers returned.
 680  *
 681  * \see intel_update_renderbuffers()
 682  * \see DRI2GetBuffers()
 683  * \see DRI2GetBuffersWithFormat()
 684  */
 685 static void
 686 intel_query_dri2_buffers(struct intel_context *intel,
 687                          __DRIdrawable *drawable,
 688                          __DRIbuffer **buffers,
 689                          int *buffer_count)
 690 {
 691    __DRIscreen *screen = intel->intelScreen->driScrnPriv;
 692    struct gl_framebuffer *fb = drawable->driverPrivate;
 693    int i = 0;
 694    unsigned attachments[8];
 695
 696    struct intel_renderbuffer *front_rb;
 697    struct intel_renderbuffer *back_rb;
 698
 699    front_rb = intel_get_renderbuffer(fb, BUFFER_FRONT_LEFT);
 700    back_rb = intel_get_renderbuffer(fb, BUFFER_BACK_LEFT);
 701
 702    memset(attachments, 0, sizeof(attachments));
 703    if ((intel->is_front_buffer_rendering ||
 704         intel->is_front_buffer_reading ||
 705         !back_rb) && front_rb) {
 706       /* If a fake front buffer is in use, then querying for
 707        * __DRI_BUFFER_FRONT_LEFT will cause the server to copy the image from
 708        * the real front buffer to the fake front buffer.  So before doing the
 709        * query, we need to make sure all the pending drawing has landed in the
 710        * real front buffer.
 711        */
 712       intel_flush(&intel->ctx);
 713       intel_flush_front(&intel->ctx);
 714
 715       attachments[i++] = __DRI_BUFFER_FRONT_LEFT;
 716       attachments[i++] = intel_bits_per_pixel(front_rb);
 717    } else if (front_rb && intel->front_buffer_dirty) {
 718       /* We have pending front buffer rendering, but we aren't querying for a
 719        * front buffer.  If the front buffer we have is a fake front buffer,
 720        * the X server is going to throw it away when it processes the query.
 721        * So before doing the query, make sure all the pending drawing has
 722        * landed in the real front buffer.
 723        */
 724       intel_flush(&intel->ctx);
 725       intel_flush_front(&intel->ctx);
 726    }
 727
 728    if (back_rb) {
 729       attachments[i++] = __DRI_BUFFER_BACK_LEFT;
 730       attachments[i++] = intel_bits_per_pixel(back_rb);
 731    }
 732
 733    assert(i <= ARRAY_SIZE(attachments));
 734
 735    *buffers = screen->dri2.loader->getBuffersWithFormat(drawable,
 736                                                         &drawable->w,
 737                                                         &drawable->h,
 738                                                         attachments, i / 2,
 739                                                         buffer_count,
 740                                                         drawable->loaderPrivate);
 741 }
 742
 743 /**
 744  * \brief Assign a DRI buffer's DRM region to a renderbuffer.
 745  *
 746  * This is called from intel_update_renderbuffers().
 747  *
 748  * \par Note:
 749  *    DRI buffers whose attachment point is DRI2BufferStencil or
 750  *    DRI2BufferDepthStencil are handled as special cases.
 751  *
 752  * \param buffer_name is a human readable name, such as "dri2 front buffer",
 753  *        that is passed to intel_region_alloc_for_handle().
 754  *
 755  * \see intel_update_renderbuffers()
 756  * \see intel_region_alloc_for_handle()
 757  */
 758 static void
 759 intel_process_dri2_buffer(struct intel_context *intel,
 760                           __DRIdrawable *drawable,
 761                           __DRIbuffer *buffer,
 762                           struct intel_renderbuffer *rb,
 763                           const char *buffer_name)
 764 {
 765    struct intel_region *region = NULL;
 766
 767    if (!rb)
 768       return;
 769
 770    /* We try to avoid closing and reopening the same BO name, because the first
 771     * use of a mapping of the buffer involves a bunch of page faulting which is
 772     * moderately expensive.
 773     */
 774    if (rb->mt &&
 775        rb->mt->region &&
 776        rb->mt->region->name == buffer->name)
 777       return;
 778
 779    if (unlikely(INTEL_DEBUG & DEBUG_DRI)) {
 780       fprintf(stderr,
 781               "attaching buffer %d, at %d, cpp %d, pitch %d\n",
 782               buffer->name, buffer->attachment,
 783               buffer->cpp, buffer->pitch);
 784    }
 785
 786    intel_miptree_release(&rb->mt);
 787    region = intel_region_alloc_for_handle(intel->intelScreen,
 788                                           buffer->cpp,
 789                                           drawable->w,
 790                                           drawable->h,
 791                                           buffer->pitch,
 792                                           buffer->name,
 793                                           buffer_name);
 794    if (!region)
 795       return;
 796
 797    rb->mt = intel_miptree_create_for_dri2_buffer(intel,
 798                                                  buffer->attachment,
 799                                                  intel_rb_format(rb),
 800                                                  region);
 801    intel_region_release(&region);
 802 }
 803
 804 /**
 805  * \brief Query DRI Image loader to obtain a DRIdrawable's buffers.
 806  *
 807  * To determine which DRI buffers to request, examine the renderbuffers
 808  * attached to the drawable's framebuffer. Then request the buffers with
 809  * dri3
 810  *
 811  * This is called from intel_update_renderbuffers().
 812  *
 813  * \param drawable      Drawable whose buffers are queried.
 814  * \param buffers       [out] List of buffers returned by DRI2 query.
 815  * \param buffer_count  [out] Number of buffers returned.
 816  *
 817  * \see intel_update_renderbuffers()
 818  */
 819
 820 static void
 821 intel_update_image_buffer(struct intel_context *intel,
 822                           __DRIdrawable *drawable,
 823                           struct intel_renderbuffer *rb,
 824                           __DRIimage *buffer,
 825                           enum __DRIimageBufferMask buffer_type)
 826 {
 827    struct intel_region *region = buffer->region;
 828
 829    if (!rb || !region)
 830       return;
 831
 832    unsigned num_samples = rb->Base.Base.NumSamples;
 833
 834    if (rb->mt &&
 835        rb->mt->region &&
 836        rb->mt->region == region)
 837       return;
 838
 839    intel_miptree_release(&rb->mt);
 840    rb->mt = intel_miptree_create_for_image_buffer(intel,
 841                                                   buffer_type,
 842                                                   intel_rb_format(rb),
 843                                                   num_samples,
 844                                                   region);
 845 }
 846
 847
 848 static void
 849 intel_update_image_buffers(struct intel_context *intel, __DRIdrawable *drawable)
 850 {
 851    struct gl_framebuffer *fb = drawable->driverPrivate;
 852    __DRIscreen *screen = intel->intelScreen->driScrnPriv;
 853    struct intel_renderbuffer *front_rb;
 854    struct intel_renderbuffer *back_rb;
 855    struct __DRIimageList images;
 856    unsigned int format;
 857    uint32_t buffer_mask = 0;
 858
 859    front_rb = intel_get_renderbuffer(fb, BUFFER_FRONT_LEFT);
 860    back_rb = intel_get_renderbuffer(fb, BUFFER_BACK_LEFT);
 861
 862    if (back_rb)
 863       format = intel_rb_format(back_rb);
 864    else if (front_rb)
 865       format = intel_rb_format(front_rb);
 866    else
 867       return;
 868
 869    if ((intel->is_front_buffer_rendering || intel->is_front_buffer_reading || !back_rb) && front_rb)
 870       buffer_mask |= __DRI_IMAGE_BUFFER_FRONT;
 871
 872    if (back_rb)
 873       buffer_mask |= __DRI_IMAGE_BUFFER_BACK;
 874
 875    (*screen->image.loader->getBuffers) (drawable,
 876                                         driGLFormatToImageFormat(format),
 877                                         &drawable->dri2.stamp,
 878                                         drawable->loaderPrivate,
 879                                         buffer_mask,
 880                                         &images);
 881
 882    if (images.image_mask & __DRI_IMAGE_BUFFER_FRONT) {
 883       drawable->w = images.front->width;
 884       drawable->h = images.front->height;
 885       intel_update_image_buffer(intel,
 886                                 drawable,
 887                                 front_rb,
 888                                 images.front,
 889                                 __DRI_IMAGE_BUFFER_FRONT);
 890    }
 891    if (images.image_mask & __DRI_IMAGE_BUFFER_BACK) {
 892       drawable->w = images.back->width;
 893       drawable->h = images.back->height;
 894       intel_update_image_buffer(intel,
 895                                 drawable,
 896                                 back_rb,
 897                                 images.back,
 898                                 __DRI_IMAGE_BUFFER_BACK);
 899    }
 900 }