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)
 318 {
 319    GLuint new_state = ctx->NewState;
 320     struct intel_context *intel = intel_context(ctx);
 321
 322     if (ctx->swrast_context)
 323        _swrast_InvalidateState(ctx, new_state);
 324
 325    intel->NewGLState |= new_state;
 326
 327    if (new_state & (_NEW_SCISSOR | _NEW_BUFFERS | _NEW_VIEWPORT))
 328       _mesa_update_draw_buffer_bounds(ctx, ctx->DrawBuffer);
 329
 330    if (intel->vtbl.invalidate_state)
 331       intel->vtbl.invalidate_state( intel, new_state );
 332 }
 333
 334 void
 335 intel_flush_rendering_to_batch(struct gl_context *ctx)
 336 {
 337    struct intel_context *intel = intel_context(ctx);
 338
 339    if (intel->Fallback)
 340       _swrast_flush(ctx);
 341
 342    INTEL_FIREVERTICES(intel);
 343 }
 344
 345 void
 346 _intel_flush(struct gl_context *ctx, const char *file, int line)
 347 {
 348    struct intel_context *intel = intel_context(ctx);
 349
 350    intel_flush_rendering_to_batch(ctx);
 351
 352    if (intel->batch.used)
 353       _intel_batchbuffer_flush(intel, file, line);
 354 }
 355
 356 static void
 357 intel_glFlush(struct gl_context *ctx)
 358 {
 359    struct intel_context *intel = intel_context(ctx);
 360
 361    intel_flush(ctx);
 362    intel_flush_front(ctx);
 363    if (_mesa_is_front_buffer_drawing(ctx->DrawBuffer))
 364       intel->need_throttle = true;
 365 }
 366
 367 void
 368 intelFinish(struct gl_context * ctx)
 369 {
 370    struct intel_context *intel = intel_context(ctx);
 371
 372    intel_flush(ctx);
 373    intel_flush_front(ctx);
 374
 375    if (intel->batch.last_bo)
 376       drm_intel_bo_wait_rendering(intel->batch.last_bo);
 377 }
 378
 379 void
 380 intelInitDriverFunctions(struct dd_function_table *functions)
 381 {
 382    _mesa_init_driver_functions(functions);
 383    _tnl_init_driver_draw_function(functions);
 384
 385    functions->Flush = intel_glFlush;
 386    functions->Finish = intelFinish;
 387    functions->GetString = intelGetString;
 388    functions->UpdateState = intelInvalidateState;
 389
 390    intelInitTextureFuncs(functions);
 391    intelInitTextureImageFuncs(functions);
 392    intelInitTextureSubImageFuncs(functions);
 393    intelInitTextureCopyImageFuncs(functions);
 394    intelInitClearFuncs(functions);
 395    intelInitBufferFuncs(functions);
 396    intelInitPixelFuncs(functions);
 397    intelInitBufferObjectFuncs(functions);
 398    intel_init_syncobj_functions(functions);
 399 }
 400
 401 bool
 402 intelInitContext(struct intel_context *intel,
 403                  int api,
 404                  unsigned major_version,
 405                  unsigned minor_version,
 406                  uint32_t flags,
 407                  const struct gl_config * mesaVis,
 408                  __DRIcontext * driContextPriv,
 409                  void *sharedContextPrivate,
 410                  struct dd_function_table *functions,
 411                  unsigned *dri_ctx_error)
 412 {
 413    struct gl_context *ctx = &intel->ctx;
 414    struct gl_context *shareCtx = (struct gl_context *) sharedContextPrivate;
 415    __DRIscreen *sPriv = driContextPriv->driScreenPriv;
 416    struct intel_screen *intelScreen = sPriv->driverPrivate;
 417    int bo_reuse_mode;
 418
 419    /* Can't rely on invalidate events, fall back to glViewport hack */
 420    if (!driContextPriv->driScreenPriv->dri2.useInvalidate)
 421       functions->Viewport = intel_noninvalidate_viewport;
 422    else
 423       functions->Viewport = intel_viewport;
 424
 425    intel->intelScreen = intelScreen;
 426
 427    if (!_mesa_initialize_context(&intel->ctx, api, mesaVis, shareCtx,
 428                                  functions)) {
 429       *dri_ctx_error = __DRI_CTX_ERROR_NO_MEMORY;
 430       printf("%s: failed to init mesa context\n", __func__);
 431       return false;
 432    }
 433
 434    driContextSetFlags(&intel->ctx, flags);
 435
 436    driContextPriv->driverPrivate = intel;
 437    intel->driContext = driContextPriv;
 438
 439    intel->gen = intelScreen->gen;
 440
 441    const int devID = intelScreen->deviceID;
 442
 443    intel->is_945 = IS_945(devID);
 444
 445    memset(&ctx->TextureFormatSupported,
 446           0, sizeof(ctx->TextureFormatSupported));
 447
 448    driParseConfigFiles(&intel->optionCache, &intelScreen->optionCache,
 449                        sPriv->myNum, "i915", NULL);
 450    intel->maxBatchSize = 4096;
 451
 452    /* Estimate the size of the mappable aperture into the GTT.  There's an
 453     * ioctl to get the whole GTT size, but not one to get the mappable subset.
 454     * It turns out it's basically always 256MB, though some ancient hardware
 455     * was smaller.
 456     */
 457    uint32_t gtt_size = 256 * 1024 * 1024;
 458    if (intel->gen == 2)
 459       gtt_size = 128 * 1024 * 1024;
 460
 461    /* We don't want to map two objects such that a memcpy between them would
 462     * just fault one mapping in and then the other over and over forever.  So
 463     * we would need to divide the GTT size by 2.  Additionally, some GTT is
 464     * taken up by things like the framebuffer and the ringbuffer and such, so
 465     * be more conservative.
 466     */
 467    intel->max_gtt_map_object_size = gtt_size / 4;
 468
 469    intel->bufmgr = intelScreen->bufmgr;
 470
 471    bo_reuse_mode = driQueryOptioni(&intel->optionCache, "bo_reuse");
 472    switch (bo_reuse_mode) {
 473    case DRI_CONF_BO_REUSE_DISABLED:
 474       break;
 475    case DRI_CONF_BO_REUSE_ALL:
 476       intel_bufmgr_gem_enable_reuse(intel->bufmgr);
 477       break;
 478    }
 479
 480    ctx->Const.MinLineWidth = 1.0;
 481    ctx->Const.MinLineWidthAA = 1.0;
 482    ctx->Const.MaxLineWidth = 7.0;
 483    ctx->Const.MaxLineWidthAA = 7.0;
 484    ctx->Const.LineWidthGranularity = 0.5;
 485
 486    ctx->Const.MinPointSize = 1.0;
 487    ctx->Const.MinPointSizeAA = 1.0;
 488    ctx->Const.MaxPointSize = 255.0;
 489    ctx->Const.MaxPointSizeAA = 3.0;
 490    ctx->Const.PointSizeGranularity = 1.0;
 491
 492    ctx->Const.StripTextureBorder = GL_TRUE;
 493
 494    /* reinitialize the context point state.
 495     * It depend on constants in __struct gl_contextRec::Const
 496     */
 497    _mesa_init_point(ctx);
 498
 499    ctx->Const.MaxRenderbufferSize = 2048;
 500
 501    _swrast_CreateContext(ctx);
 502    _vbo_CreateContext(ctx);
 503    if (ctx->swrast_context) {
 504       _tnl_CreateContext(ctx);
 505       _swsetup_CreateContext(ctx);
 506
 507       /* Configure swrast to match hardware characteristics: */
 508       _swrast_allow_pixel_fog(ctx, false);
 509       _swrast_allow_vertex_fog(ctx, true);
 510    }
 511
 512    _mesa_meta_init(ctx);
 513
 514    intel->hw_stipple = 1;
 515
 516    intel->RenderIndex = ~0;
 517
 518    intelInitExtensions(ctx);
 519
 520    INTEL_DEBUG = parse_debug_string(getenv("INTEL_DEBUG"), debug_control);
 521    if (INTEL_DEBUG & DEBUG_BUFMGR)
 522       dri_bufmgr_set_debug(intel->bufmgr, true);
 523    if (INTEL_DEBUG & DEBUG_PERF)
 524       intel->perf_debug = true;
 525
 526    if (INTEL_DEBUG & DEBUG_AUB)
 527       drm_intel_bufmgr_gem_set_aub_dump(intel->bufmgr, true);
 528
 529    intel_batchbuffer_init(intel);
 530
 531    intel_fbo_init(intel);
 532
 533    intel->prim.primitive = ~0;
 534
 535    /* Force all software fallbacks */
 536    if (getenv("INTEL_NO_RAST")) {
 537       fprintf(stderr, "disabling 3D rasterization\n");
 538       intel->no_rast = 1;
 539    }
 540
 541    if (driQueryOptionb(&intel->optionCache, "always_flush_batch")) {
 542       fprintf(stderr, "flushing batchbuffer before/after each draw call\n");
 543       intel->always_flush_batch = 1;
 544    }
 545
 546    if (driQueryOptionb(&intel->optionCache, "always_flush_cache")) {
 547       fprintf(stderr, "flushing GPU caches before/after each draw call\n");
 548       intel->always_flush_cache = 1;
 549    }
 550
 551    if (driQueryOptionb(&intel->optionCache, "disable_throttling")) {
 552       fprintf(stderr, "disabling flush throttling\n");
 553       intel->disable_throttling = 1;
 554    }
 555
 556    return true;
 557 }
 558
 559 void
 560 intelDestroyContext(__DRIcontext * driContextPriv)
 561 {
 562    struct intel_context *intel =
 563       (struct intel_context *) driContextPriv->driverPrivate;
 564    struct gl_context *ctx = &intel->ctx;
 565
 566    assert(intel);               /* should never be null */
 567    if (intel) {
 568       INTEL_FIREVERTICES(intel);
 569
 570       /* Dump a final BMP in case the application doesn't call SwapBuffers */
 571       if (INTEL_DEBUG & DEBUG_AUB) {
 572          intel_batchbuffer_flush(intel);
 573          aub_dump_bmp(&intel->ctx);
 574       }
 575
 576       _mesa_meta_free(&intel->ctx);
 577
 578       intel->vtbl.destroy(intel);
 579
 580       if (ctx->swrast_context) {
 581          _swsetup_DestroyContext(&intel->ctx);
 582          _tnl_DestroyContext(&intel->ctx);
 583       }
 584       _vbo_DestroyContext(&intel->ctx);
 585
 586       if (ctx->swrast_context)
 587          _swrast_DestroyContext(&intel->ctx);
 588       intel->Fallback = 0x0;      /* don't call _swrast_Flush later */
 589
 590       intel_batchbuffer_free(intel);
 591
 592       free(intel->prim.vb);
 593       intel->prim.vb = NULL;
 594       drm_intel_bo_unreference(intel->prim.vb_bo);
 595       intel->prim.vb_bo = NULL;
 596       drm_intel_bo_unreference(intel->first_post_swapbuffers_batch);
 597       intel->first_post_swapbuffers_batch = NULL;
 598
 599       driDestroyOptionCache(&intel->optionCache);
 600
 601       /* free the Mesa context */
 602       _mesa_free_context_data(&intel->ctx, true);
 603
 604       _math_matrix_dtr(&intel->ViewportMatrix);
 605
 606       ralloc_free(intel);
 607       driContextPriv->driverPrivate = NULL;
 608    }
 609 }
 610
 611 GLboolean
 612 intelUnbindContext(__DRIcontext * driContextPriv)
 613 {
 614    /* Unset current context and dispath table */
 615    _mesa_make_current(NULL, NULL, NULL);
 616
 617    return true;
 618 }
 619
 620 GLboolean
 621 intelMakeCurrent(__DRIcontext * driContextPriv,
 622                  __DRIdrawable * driDrawPriv,
 623                  __DRIdrawable * driReadPriv)
 624 {
 625    struct intel_context *intel;
 626
 627    if (driContextPriv)
 628       intel = (struct intel_context *) driContextPriv->driverPrivate;
 629    else
 630       intel = NULL;
 631
 632    if (driContextPriv) {
 633       struct gl_context *ctx = &intel->ctx;
 634       struct gl_framebuffer *fb, *readFb;
 635
 636       if (driDrawPriv == NULL && driReadPriv == NULL) {
 637          fb = _mesa_get_incomplete_framebuffer();
 638          readFb = _mesa_get_incomplete_framebuffer();
 639       } else {
 640          fb = driDrawPriv->driverPrivate;
 641          readFb = driReadPriv->driverPrivate;
 642          driContextPriv->dri2.draw_stamp = driDrawPriv->dri2.stamp - 1;
 643          driContextPriv->dri2.read_stamp = driReadPriv->dri2.stamp - 1;
 644       }
 645
 646       intel_prepare_render(intel);
 647       _mesa_make_current(ctx, fb, readFb);
 648
 649       /* We do this in intel_prepare_render() too, but intel->ctx.DrawBuffer
 650        * is NULL at that point.  We can't call _mesa_makecurrent()
 651        * first, since we need the buffer size for the initial
 652        * viewport.  So just call intel_draw_buffer() again here. */
 653       intel_draw_buffer(ctx);
 654    }
 655    else {
 656       _mesa_make_current(NULL, NULL, NULL);
 657    }
 658
 659    return true;
 660 }
 661
 662 /**
 663  * \brief Query DRI2 to obtain a DRIdrawable's buffers.
 664  *
 665  * To determine which DRI buffers to request, examine the renderbuffers
 666  * attached to the drawable's framebuffer. Then request the buffers with
 667  * DRI2GetBuffers() or DRI2GetBuffersWithFormat().
 668  *
 669  * This is called from intel_update_renderbuffers().
 670  *
 671  * \param drawable      Drawable whose buffers are queried.
 672  * \param buffers       [out] List of buffers returned by DRI2 query.
 673  * \param buffer_count  [out] Number of buffers returned.
 674  *
 675  * \see intel_update_renderbuffers()
 676  * \see DRI2GetBuffers()
 677  * \see DRI2GetBuffersWithFormat()
 678  */
 679 static void
 680 intel_query_dri2_buffers(struct intel_context *intel,
 681                          __DRIdrawable *drawable,
 682                          __DRIbuffer **buffers,
 683                          int *buffer_count)
 684 {
 685    __DRIscreen *screen = intel->intelScreen->driScrnPriv;
 686    struct gl_framebuffer *fb = drawable->driverPrivate;
 687    int i = 0;
 688    unsigned attachments[8];
 689
 690    struct intel_renderbuffer *front_rb;
 691    struct intel_renderbuffer *back_rb;
 692
 693    front_rb = intel_get_renderbuffer(fb, BUFFER_FRONT_LEFT);
 694    back_rb = intel_get_renderbuffer(fb, BUFFER_BACK_LEFT);
 695
 696    memset(attachments, 0, sizeof(attachments));
 697    if ((_mesa_is_front_buffer_drawing(fb) ||
 698         _mesa_is_front_buffer_reading(fb) ||
 699         !back_rb) && front_rb) {
 700       /* If a fake front buffer is in use, then querying for
 701        * __DRI_BUFFER_FRONT_LEFT will cause the server to copy the image from
 702        * the real front buffer to the fake front buffer.  So before doing the
 703        * query, we need to make sure all the pending drawing has landed in the
 704        * real front buffer.
 705        */
 706       intel_flush(&intel->ctx);
 707       intel_flush_front(&intel->ctx);
 708
 709       attachments[i++] = __DRI_BUFFER_FRONT_LEFT;
 710       attachments[i++] = intel_bits_per_pixel(front_rb);
 711    } else if (front_rb && intel->front_buffer_dirty) {
 712       /* We have pending front buffer rendering, but we aren't querying for a
 713        * front buffer.  If the front buffer we have is a fake front buffer,
 714        * the X server is going to throw it away when it processes the query.
 715        * So before doing the query, make sure all the pending drawing has
 716        * landed in the real front buffer.
 717        */
 718       intel_flush(&intel->ctx);
 719       intel_flush_front(&intel->ctx);
 720    }
 721
 722    if (back_rb) {
 723       attachments[i++] = __DRI_BUFFER_BACK_LEFT;
 724       attachments[i++] = intel_bits_per_pixel(back_rb);
 725    }
 726
 727    assert(i <= ARRAY_SIZE(attachments));
 728
 729    *buffers = screen->dri2.loader->getBuffersWithFormat(drawable,
 730                                                         &drawable->w,
 731                                                         &drawable->h,
 732                                                         attachments, i / 2,
 733                                                         buffer_count,
 734                                                         drawable->loaderPrivate);
 735 }
 736
 737 /**
 738  * \brief Assign a DRI buffer's DRM region to a renderbuffer.
 739  *
 740  * This is called from intel_update_renderbuffers().
 741  *
 742  * \par Note:
 743  *    DRI buffers whose attachment point is DRI2BufferStencil or
 744  *    DRI2BufferDepthStencil are handled as special cases.
 745  *
 746  * \param buffer_name is a human readable name, such as "dri2 front buffer",
 747  *        that is passed to intel_region_alloc_for_handle().
 748  *
 749  * \see intel_update_renderbuffers()
 750  * \see intel_region_alloc_for_handle()
 751  */
 752 static void
 753 intel_process_dri2_buffer(struct intel_context *intel,
 754                           __DRIdrawable *drawable,
 755                           __DRIbuffer *buffer,
 756                           struct intel_renderbuffer *rb,
 757                           const char *buffer_name)
 758 {
 759    struct intel_region *region = NULL;
 760
 761    if (!rb)
 762       return;
 763
 764    /* We try to avoid closing and reopening the same BO name, because the first
 765     * use of a mapping of the buffer involves a bunch of page faulting which is
 766     * moderately expensive.
 767     */
 768    if (rb->mt &&
 769        rb->mt->region &&
 770        rb->mt->region->name == buffer->name)
 771       return;
 772
 773    if (unlikely(INTEL_DEBUG & DEBUG_DRI)) {
 774       fprintf(stderr,
 775               "attaching buffer %d, at %d, cpp %d, pitch %d\n",
 776               buffer->name, buffer->attachment,
 777               buffer->cpp, buffer->pitch);
 778    }
 779
 780    intel_miptree_release(&rb->mt);
 781    region = intel_region_alloc_for_handle(intel->intelScreen,
 782                                           buffer->cpp,
 783                                           drawable->w,
 784                                           drawable->h,
 785                                           buffer->pitch,
 786                                           buffer->name,
 787                                           buffer_name);
 788    if (!region)
 789       return;
 790
 791    rb->mt = intel_miptree_create_for_dri2_buffer(intel,
 792                                                  buffer->attachment,
 793                                                  intel_rb_format(rb),
 794                                                  region);
 795    intel_region_release(&region);
 796 }
 797
 798 /**
 799  * \brief Query DRI Image loader to obtain a DRIdrawable's buffers.
 800  *
 801  * To determine which DRI buffers to request, examine the renderbuffers
 802  * attached to the drawable's framebuffer. Then request the buffers with
 803  * dri3
 804  *
 805  * This is called from intel_update_renderbuffers().
 806  *
 807  * \param drawable      Drawable whose buffers are queried.
 808  * \param buffers       [out] List of buffers returned by DRI2 query.
 809  * \param buffer_count  [out] Number of buffers returned.
 810  *
 811  * \see intel_update_renderbuffers()
 812  */
 813
 814 static void
 815 intel_update_image_buffer(struct intel_context *intel,
 816                           __DRIdrawable *drawable,
 817                           struct intel_renderbuffer *rb,
 818                           __DRIimage *buffer,
 819                           enum __DRIimageBufferMask buffer_type)
 820 {
 821    struct intel_region *region = buffer->region;
 822
 823    if (!rb || !region)
 824       return;
 825
 826    unsigned num_samples = rb->Base.Base.NumSamples;
 827
 828    if (rb->mt &&
 829        rb->mt->region &&
 830        rb->mt->region == region)
 831       return;
 832
 833    intel_miptree_release(&rb->mt);
 834    rb->mt = intel_miptree_create_for_image_buffer(intel,
 835                                                   buffer_type,
 836                                                   intel_rb_format(rb),
 837                                                   num_samples,
 838                                                   region);
 839 }
 840
 841
 842 static void
 843 intel_update_image_buffers(struct intel_context *intel, __DRIdrawable *drawable)
 844 {
 845    struct gl_framebuffer *fb = drawable->driverPrivate;
 846    __DRIscreen *screen = intel->intelScreen->driScrnPriv;
 847    struct intel_renderbuffer *front_rb;
 848    struct intel_renderbuffer *back_rb;
 849    struct __DRIimageList images;
 850    unsigned int format;
 851    uint32_t buffer_mask = 0;
 852    int ret;
 853
 854    front_rb = intel_get_renderbuffer(fb, BUFFER_FRONT_LEFT);
 855    back_rb = intel_get_renderbuffer(fb, BUFFER_BACK_LEFT);
 856
 857    if (back_rb)
 858       format = intel_rb_format(back_rb);
 859    else if (front_rb)
 860       format = intel_rb_format(front_rb);
 861    else
 862       return;
 863
 864    if (front_rb && (_mesa_is_front_buffer_drawing(fb) ||
 865                     _mesa_is_front_buffer_reading(fb) || !back_rb)) {
 866       buffer_mask |= __DRI_IMAGE_BUFFER_FRONT;
 867    }
 868
 869    if (back_rb)
 870       buffer_mask |= __DRI_IMAGE_BUFFER_BACK;
 871
 872    ret = screen->image.loader->getBuffers(drawable,
 873                                           driGLFormatToImageFormat(format),
 874                                           &drawable->dri2.stamp,
 875                                           drawable->loaderPrivate,
 876                                           buffer_mask,
 877                                           &images);
 878    if (!ret)
 879       return;
 880
 881    if (images.image_mask & __DRI_IMAGE_BUFFER_FRONT) {
 882       drawable->w = images.front->width;
 883       drawable->h = images.front->height;
 884       intel_update_image_buffer(intel,
 885                                 drawable,
 886                                 front_rb,
 887                                 images.front,
 888                                 __DRI_IMAGE_BUFFER_FRONT);
 889    }
 890    if (images.image_mask & __DRI_IMAGE_BUFFER_BACK) {
 891       drawable->w = images.back->width;
 892       drawable->h = images.back->height;
 893       intel_update_image_buffer(intel,
 894                                 drawable,
 895                                 back_rb,
 896                                 images.back,
 897                                 __DRI_IMAGE_BUFFER_BACK);
 898    }
 899 }