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 "../glsl/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", __FUNCTION__);
 426       return false;
 427    }
 428
 429    driContextPriv->driverPrivate = intel;
 430    intel->driContext = driContextPriv;
 431    intel->driFd = sPriv->fd;
 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 = 5.0;
 479    ctx->Const.MaxLineWidthAA = 5.0;
 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_stencil = mesaVis && mesaVis->stencilBits && mesaVis->depthBits == 24;
 511    intel->hw_stipple = 1;
 512
 513    intel->RenderIndex = ~0;
 514
 515    intelInitExtensions(ctx);
 516
 517    INTEL_DEBUG = driParseDebugString(getenv("INTEL_DEBUG"), debug_control);
 518    if (INTEL_DEBUG & DEBUG_BUFMGR)
 519       dri_bufmgr_set_debug(intel->bufmgr, true);
 520    if (INTEL_DEBUG & DEBUG_PERF)
 521       intel->perf_debug = true;
 522
 523    if (INTEL_DEBUG & DEBUG_AUB)
 524       drm_intel_bufmgr_gem_set_aub_dump(intel->bufmgr, true);
 525
 526    intel_batchbuffer_init(intel);
 527
 528    intel_fbo_init(intel);
 529
 530    intel->use_early_z = driQueryOptionb(&intel->optionCache, "early_z");
 531
 532    intel->prim.primitive = ~0;
 533
 534    /* Force all software fallbacks */
 535    if (driQueryOptionb(&intel->optionCache, "no_rast")) {
 536       fprintf(stderr, "disabling 3D rasterization\n");
 537       intel->no_rast = 1;
 538    }
 539
 540    if (driQueryOptionb(&intel->optionCache, "always_flush_batch")) {
 541       fprintf(stderr, "flushing batchbuffer before/after each draw call\n");
 542       intel->always_flush_batch = 1;
 543    }
 544
 545    if (driQueryOptionb(&intel->optionCache, "always_flush_cache")) {
 546       fprintf(stderr, "flushing GPU caches before/after each draw call\n");
 547       intel->always_flush_cache = 1;
 548    }
 549
 550    if (driQueryOptionb(&intel->optionCache, "disable_throttling")) {
 551       fprintf(stderr, "disabling flush throttling\n");
 552       intel->disable_throttling = 1;
 553    }
 554
 555    return true;
 556 }
 557
 558 void
 559 intelDestroyContext(__DRIcontext * driContextPriv)
 560 {
 561    struct intel_context *intel =
 562       (struct intel_context *) driContextPriv->driverPrivate;
 563    struct gl_context *ctx = &intel->ctx;
 564
 565    assert(intel);               /* should never be null */
 566    if (intel) {
 567       INTEL_FIREVERTICES(intel);
 568
 569       /* Dump a final BMP in case the application doesn't call SwapBuffers */
 570       if (INTEL_DEBUG & DEBUG_AUB) {
 571          intel_batchbuffer_flush(intel);
 572          aub_dump_bmp(&intel->ctx);
 573       }
 574
 575       _mesa_meta_free(&intel->ctx);
 576
 577       intel->vtbl.destroy(intel);
 578
 579       if (ctx->swrast_context) {
 580          _swsetup_DestroyContext(&intel->ctx);
 581          _tnl_DestroyContext(&intel->ctx);
 582       }
 583       _vbo_DestroyContext(&intel->ctx);
 584
 585       if (ctx->swrast_context)
 586          _swrast_DestroyContext(&intel->ctx);
 587       intel->Fallback = 0x0;      /* don't call _swrast_Flush later */
 588
 589       intel_batchbuffer_free(intel);
 590
 591       free(intel->prim.vb);
 592       intel->prim.vb = NULL;
 593       drm_intel_bo_unreference(intel->prim.vb_bo);
 594       intel->prim.vb_bo = NULL;
 595       drm_intel_bo_unreference(intel->first_post_swapbuffers_batch);
 596       intel->first_post_swapbuffers_batch = NULL;
 597
 598       driDestroyOptionCache(&intel->optionCache);
 599
 600       /* free the Mesa context */
 601       _mesa_free_context_data(&intel->ctx);
 602
 603       _math_matrix_dtr(&intel->ViewportMatrix);
 604
 605       ralloc_free(intel);
 606       driContextPriv->driverPrivate = NULL;
 607    }
 608 }
 609
 610 GLboolean
 611 intelUnbindContext(__DRIcontext * driContextPriv)
 612 {
 613    /* Unset current context and dispath table */
 614    _mesa_make_current(NULL, NULL, NULL);
 615
 616    return true;
 617 }
 618
 619 GLboolean
 620 intelMakeCurrent(__DRIcontext * driContextPriv,
 621                  __DRIdrawable * driDrawPriv,
 622                  __DRIdrawable * driReadPriv)
 623 {
 624    struct intel_context *intel;
 625    GET_CURRENT_CONTEXT(curCtx);
 626
 627    if (driContextPriv)
 628       intel = (struct intel_context *) driContextPriv->driverPrivate;
 629    else
 630       intel = NULL;
 631
 632    /* According to the glXMakeCurrent() man page: "Pending commands to
 633     * the previous context, if any, are flushed before it is released."
 634     * But only flush if we're actually changing contexts.
 635     */
 636    if (intel_context(curCtx) && intel_context(curCtx) != intel) {
 637       _mesa_flush(curCtx);
 638    }
 639
 640    if (driContextPriv) {
 641       struct gl_context *ctx = &intel->ctx;
 642       struct gl_framebuffer *fb, *readFb;
 643
 644       if (driDrawPriv == NULL && driReadPriv == NULL) {
 645          fb = _mesa_get_incomplete_framebuffer();
 646          readFb = _mesa_get_incomplete_framebuffer();
 647       } else {
 648          fb = driDrawPriv->driverPrivate;
 649          readFb = driReadPriv->driverPrivate;
 650          driContextPriv->dri2.draw_stamp = driDrawPriv->dri2.stamp - 1;
 651          driContextPriv->dri2.read_stamp = driReadPriv->dri2.stamp - 1;
 652       }
 653
 654       intel_prepare_render(intel);
 655       _mesa_make_current(ctx, fb, readFb);
 656
 657       /* We do this in intel_prepare_render() too, but intel->ctx.DrawBuffer
 658        * is NULL at that point.  We can't call _mesa_makecurrent()
 659        * first, since we need the buffer size for the initial
 660        * viewport.  So just call intel_draw_buffer() again here. */
 661       intel_draw_buffer(ctx);
 662    }
 663    else {
 664       _mesa_make_current(NULL, NULL, NULL);
 665    }
 666
 667    return true;
 668 }
 669
 670 /**
 671  * \brief Query DRI2 to obtain a DRIdrawable's buffers.
 672  *
 673  * To determine which DRI buffers to request, examine the renderbuffers
 674  * attached to the drawable's framebuffer. Then request the buffers with
 675  * DRI2GetBuffers() or DRI2GetBuffersWithFormat().
 676  *
 677  * This is called from intel_update_renderbuffers().
 678  *
 679  * \param drawable      Drawable whose buffers are queried.
 680  * \param buffers       [out] List of buffers returned by DRI2 query.
 681  * \param buffer_count  [out] Number of buffers returned.
 682  *
 683  * \see intel_update_renderbuffers()
 684  * \see DRI2GetBuffers()
 685  * \see DRI2GetBuffersWithFormat()
 686  */
 687 static void
 688 intel_query_dri2_buffers(struct intel_context *intel,
 689                          __DRIdrawable *drawable,
 690                          __DRIbuffer **buffers,
 691                          int *buffer_count)
 692 {
 693    __DRIscreen *screen = intel->intelScreen->driScrnPriv;
 694    struct gl_framebuffer *fb = drawable->driverPrivate;
 695    int i = 0;
 696    unsigned attachments[8];
 697
 698    struct intel_renderbuffer *front_rb;
 699    struct intel_renderbuffer *back_rb;
 700
 701    front_rb = intel_get_renderbuffer(fb, BUFFER_FRONT_LEFT);
 702    back_rb = intel_get_renderbuffer(fb, BUFFER_BACK_LEFT);
 703
 704    memset(attachments, 0, sizeof(attachments));
 705    if ((intel->is_front_buffer_rendering ||
 706         intel->is_front_buffer_reading ||
 707         !back_rb) && front_rb) {
 708       /* If a fake front buffer is in use, then querying for
 709        * __DRI_BUFFER_FRONT_LEFT will cause the server to copy the image from
 710        * the real front buffer to the fake front buffer.  So before doing the
 711        * query, we need to make sure all the pending drawing has landed in the
 712        * real front buffer.
 713        */
 714       intel_flush(&intel->ctx);
 715       intel_flush_front(&intel->ctx);
 716
 717       attachments[i++] = __DRI_BUFFER_FRONT_LEFT;
 718       attachments[i++] = intel_bits_per_pixel(front_rb);
 719    } else if (front_rb && intel->front_buffer_dirty) {
 720       /* We have pending front buffer rendering, but we aren't querying for a
 721        * front buffer.  If the front buffer we have is a fake front buffer,
 722        * the X server is going to throw it away when it processes the query.
 723        * So before doing the query, make sure all the pending drawing has
 724        * landed in the real front buffer.
 725        */
 726       intel_flush(&intel->ctx);
 727       intel_flush_front(&intel->ctx);
 728    }
 729
 730    if (back_rb) {
 731       attachments[i++] = __DRI_BUFFER_BACK_LEFT;
 732       attachments[i++] = intel_bits_per_pixel(back_rb);
 733    }
 734
 735    assert(i <= ARRAY_SIZE(attachments));
 736
 737    *buffers = screen->dri2.loader->getBuffersWithFormat(drawable,
 738                                                         &drawable->w,
 739                                                         &drawable->h,
 740                                                         attachments, i / 2,
 741                                                         buffer_count,
 742                                                         drawable->loaderPrivate);
 743 }
 744
 745 /**
 746  * \brief Assign a DRI buffer's DRM region to a renderbuffer.
 747  *
 748  * This is called from intel_update_renderbuffers().
 749  *
 750  * \par Note:
 751  *    DRI buffers whose attachment point is DRI2BufferStencil or
 752  *    DRI2BufferDepthStencil are handled as special cases.
 753  *
 754  * \param buffer_name is a human readable name, such as "dri2 front buffer",
 755  *        that is passed to intel_region_alloc_for_handle().
 756  *
 757  * \see intel_update_renderbuffers()
 758  * \see intel_region_alloc_for_handle()
 759  */
 760 static void
 761 intel_process_dri2_buffer(struct intel_context *intel,
 762                           __DRIdrawable *drawable,
 763                           __DRIbuffer *buffer,
 764                           struct intel_renderbuffer *rb,
 765                           const char *buffer_name)
 766 {
 767    struct intel_region *region = NULL;
 768
 769    if (!rb)
 770       return;
 771
 772    /* We try to avoid closing and reopening the same BO name, because the first
 773     * use of a mapping of the buffer involves a bunch of page faulting which is
 774     * moderately expensive.
 775     */
 776    if (rb->mt &&
 777        rb->mt->region &&
 778        rb->mt->region->name == buffer->name)
 779       return;
 780
 781    if (unlikely(INTEL_DEBUG & DEBUG_DRI)) {
 782       fprintf(stderr,
 783               "attaching buffer %d, at %d, cpp %d, pitch %d\n",
 784               buffer->name, buffer->attachment,
 785               buffer->cpp, buffer->pitch);
 786    }
 787
 788    intel_miptree_release(&rb->mt);
 789    region = intel_region_alloc_for_handle(intel->intelScreen,
 790                                           buffer->cpp,
 791                                           drawable->w,
 792                                           drawable->h,
 793                                           buffer->pitch,
 794                                           buffer->name,
 795                                           buffer_name);
 796    if (!region)
 797       return;
 798
 799    rb->mt = intel_miptree_create_for_dri2_buffer(intel,
 800                                                  buffer->attachment,
 801                                                  intel_rb_format(rb),
 802                                                  region);
 803    intel_region_release(&region);
 804 }
 805
 806 /**
 807  * \brief Query DRI Image loader to obtain a DRIdrawable's buffers.
 808  *
 809  * To determine which DRI buffers to request, examine the renderbuffers
 810  * attached to the drawable's framebuffer. Then request the buffers with
 811  * dri3
 812  *
 813  * This is called from intel_update_renderbuffers().
 814  *
 815  * \param drawable      Drawable whose buffers are queried.
 816  * \param buffers       [out] List of buffers returned by DRI2 query.
 817  * \param buffer_count  [out] Number of buffers returned.
 818  *
 819  * \see intel_update_renderbuffers()
 820  */
 821
 822 static void
 823 intel_update_image_buffer(struct intel_context *intel,
 824                           __DRIdrawable *drawable,
 825                           struct intel_renderbuffer *rb,
 826                           __DRIimage *buffer,
 827                           enum __DRIimageBufferMask buffer_type)
 828 {
 829    struct intel_region *region = buffer->region;
 830
 831    if (!rb || !region)
 832       return;
 833
 834    unsigned num_samples = rb->Base.Base.NumSamples;
 835
 836    if (rb->mt &&
 837        rb->mt->region &&
 838        rb->mt->region == region)
 839       return;
 840
 841    intel_miptree_release(&rb->mt);
 842    rb->mt = intel_miptree_create_for_image_buffer(intel,
 843                                                   buffer_type,
 844                                                   intel_rb_format(rb),
 845                                                   num_samples,
 846                                                   region);
 847 }
 848
 849
 850 static void
 851 intel_update_image_buffers(struct intel_context *intel, __DRIdrawable *drawable)
 852 {
 853    struct gl_framebuffer *fb = drawable->driverPrivate;
 854    __DRIscreen *screen = intel->intelScreen->driScrnPriv;
 855    struct intel_renderbuffer *front_rb;
 856    struct intel_renderbuffer *back_rb;
 857    struct __DRIimageList images;
 858    unsigned int format;
 859    uint32_t buffer_mask = 0;
 860
 861    front_rb = intel_get_renderbuffer(fb, BUFFER_FRONT_LEFT);
 862    back_rb = intel_get_renderbuffer(fb, BUFFER_BACK_LEFT);
 863
 864    if (back_rb)
 865       format = intel_rb_format(back_rb);
 866    else if (front_rb)
 867       format = intel_rb_format(front_rb);
 868    else
 869       return;
 870
 871    if ((intel->is_front_buffer_rendering || intel->is_front_buffer_reading || !back_rb) && front_rb)
 872       buffer_mask |= __DRI_IMAGE_BUFFER_FRONT;
 873
 874    if (back_rb)
 875       buffer_mask |= __DRI_IMAGE_BUFFER_BACK;
 876
 877    (*screen->image.loader->getBuffers) (drawable,
 878                                         driGLFormatToImageFormat(format),
 879                                         &drawable->dri2.stamp,
 880                                         drawable->loaderPrivate,
 881                                         buffer_mask,
 882                                         &images);
 883
 884    if (images.image_mask & __DRI_IMAGE_BUFFER_FRONT) {
 885       drawable->w = images.front->width;
 886       drawable->h = images.front->height;
 887       intel_update_image_buffer(intel,
 888                                 drawable,
 889                                 front_rb,
 890                                 images.front,
 891                                 __DRI_IMAGE_BUFFER_FRONT);
 892    }
 893    if (images.image_mask & __DRI_IMAGE_BUFFER_BACK) {
 894       drawable->w = images.back->width;
 895       drawable->h = images.back->height;
 896       intel_update_image_buffer(intel,
 897                                 drawable,
 898                                 back_rb,
 899                                 images.back,
 900                                 __DRI_IMAGE_BUFFER_BACK);
 901    }
 902 }