src/mesa/drivers/dri/i965/intel_context.c

   1 /**************************************************************************
   2  *
   3  * Copyright 2003 Tungsten Graphics, Inc., Cedar Park, Texas.
   4  * All Rights Reserved.
   5  *
   6  * Permission is hereby granted, free of charge, to any person obtaining a
   7  * copy of this software and associated documentation files (the
   8  * "Software"), to deal in the Software without restriction, including
   9  * without limitation the rights to use, copy, modify, merge, publish,
  10  * distribute, sub license, and/or sell copies of the Software, and to
  11  * permit persons to whom the Software is furnished to do so, subject to
  12  * the following conditions:
  13  *
  14  * The above copyright notice and this permission notice (including the
  15  * next paragraph) shall be included in all copies or substantial portions
  16  * of the Software.
  17  *
  18  * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS
  19  * OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF
  20  * MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND NON-INFRINGEMENT.
  21  * IN NO EVENT SHALL TUNGSTEN GRAPHICS AND/OR ITS SUPPLIERS BE LIABLE FOR
  22  * ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN ACTION OF CONTRACT,
  23  * TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN CONNECTION WITH THE
  24  * SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE.
  25  *
  26  **************************************************************************/
  27
  28
  29 #include "main/glheader.h"
  30 #include "main/context.h"
  31 #include "main/extensions.h"
  32 #include "main/fbobject.h"
  33 #include "main/framebuffer.h"
  34 #include "main/imports.h"
  35 #include "main/renderbuffer.h"
  36
  37 #include "swrast/swrast.h"
  38 #include "swrast_setup/swrast_setup.h"
  39 #include "tnl/tnl.h"
  40 #include "drivers/common/driverfuncs.h"
  41 #include "drivers/common/meta.h"
  42
  43 #include "intel_chipset.h"
  44 #include "intel_buffers.h"
  45 #include "intel_tex.h"
  46 #include "intel_batchbuffer.h"
  47 #include "intel_pixel.h"
  48 #include "intel_regions.h"
  49 #include "intel_buffer_objects.h"
  50 #include "intel_fbo.h"
  51 #include "intel_bufmgr.h"
  52 #include "intel_screen.h"
  53 #include "intel_mipmap_tree.h"
  54
  55 #include "utils.h"
  56 #include "../glsl/ralloc.h"
  57
  58 #ifndef INTEL_DEBUG
  59 int INTEL_DEBUG = (0);
  60 #endif
  61
  62
  63 static const GLubyte *
  64 intelGetString(struct gl_context * ctx, GLenum name)
  65 {
  66    const struct intel_context *const intel = intel_context(ctx);
  67    const char *chipset;
  68    static char buffer[128];
  69
  70    switch (name) {
  71    case GL_VENDOR:
  72       return (GLubyte *) "Intel Open Source Technology Center";
  73       break;
  74
  75    case GL_RENDERER:
  76       switch (intel->intelScreen->deviceID) {
  77 #undef CHIPSET
  78 #define CHIPSET(id, symbol, str) case id: chipset = str; break;
  79 #include "pci_ids/i965_pci_ids.h"
  80       default:
  81          chipset = "Unknown Intel Chipset";
  82          break;
  83       }
  84
  85       (void) driGetRendererString(buffer, chipset, 0);
  86       return (GLubyte *) buffer;
  87
  88    default:
  89       return NULL;
  90    }
  91 }
  92
  93 void
  94 intel_resolve_for_dri2_flush(struct brw_context *brw,
  95                              __DRIdrawable *drawable)
  96 {
  97    struct intel_context *intel = &brw->intel;
  98    if (intel->gen < 6) {
  99       /* MSAA and fast color clear are not supported, so don't waste time
 100        * checking whether a resolve is needed.
 101        */
 102       return;
 103    }
 104
 105    struct gl_framebuffer *fb = drawable->driverPrivate;
 106    struct intel_renderbuffer *rb;
 107
 108    /* Usually, only the back buffer will need to be downsampled. However,
 109     * the front buffer will also need it if the user has rendered into it.
 110     */
 111    static const gl_buffer_index buffers[2] = {
 112          BUFFER_BACK_LEFT,
 113          BUFFER_FRONT_LEFT,
 114    };
 115
 116    for (int i = 0; i < 2; ++i) {
 117       rb = intel_get_renderbuffer(fb, buffers[i]);
 118       if (rb == NULL || rb->mt == NULL)
 119          continue;
 120       if (rb->mt->num_samples <= 1)
 121          intel_miptree_resolve_color(brw, rb->mt);
 122       else
 123          intel_miptree_downsample(brw, rb->mt);
 124    }
 125 }
 126
 127 static void
 128 intel_flush_front(struct gl_context *ctx)
 129 {
 130    struct brw_context *brw = brw_context(ctx);
 131    struct intel_context *intel = intel_context(ctx);
 132     __DRIcontext *driContext = intel->driContext;
 133     __DRIdrawable *driDrawable = driContext->driDrawablePriv;
 134     __DRIscreen *const screen = intel->intelScreen->driScrnPriv;
 135
 136     if (intel->front_buffer_dirty && _mesa_is_winsys_fbo(ctx->DrawBuffer)) {
 137       if (screen->dri2.loader->flushFrontBuffer != NULL &&
 138           driDrawable &&
 139           driDrawable->loaderPrivate) {
 140
 141          /* Resolve before flushing FAKE_FRONT_LEFT to FRONT_LEFT.
 142           *
 143           * This potentially resolves both front and back buffer. It
 144           * is unnecessary to resolve the back, but harms nothing except
 145           * performance. And no one cares about front-buffer render
 146           * performance.
 147           */
 148          intel_resolve_for_dri2_flush(brw, driDrawable);
 149
 150          screen->dri2.loader->flushFrontBuffer(driDrawable,
 151                                                driDrawable->loaderPrivate);
 152
 153          /* We set the dirty bit in intel_prepare_render() if we're
 154           * front buffer rendering once we get there.
 155           */
 156          intel->front_buffer_dirty = false;
 157       }
 158    }
 159 }
 160
 161 static unsigned
 162 intel_bits_per_pixel(const struct intel_renderbuffer *rb)
 163 {
 164    return _mesa_get_format_bytes(intel_rb_format(rb)) * 8;
 165 }
 166
 167 static void
 168 intel_query_dri2_buffers(struct brw_context *brw,
 169                          __DRIdrawable *drawable,
 170                          __DRIbuffer **buffers,
 171                          int *count);
 172
 173 static void
 174 intel_process_dri2_buffer(struct brw_context *brw,
 175                           __DRIdrawable *drawable,
 176                           __DRIbuffer *buffer,
 177                           struct intel_renderbuffer *rb,
 178                           const char *buffer_name);
 179
 180 void
 181 intel_update_renderbuffers(__DRIcontext *context, __DRIdrawable *drawable)
 182 {
 183    struct gl_framebuffer *fb = drawable->driverPrivate;
 184    struct intel_renderbuffer *rb;
 185    struct brw_context *brw = context->driverPrivate;
 186    struct intel_context *intel = &brw->intel;
 187    __DRIbuffer *buffers = NULL;
 188    int i, count;
 189    const char *region_name;
 190
 191    /* Set this up front, so that in case our buffers get invalidated
 192     * while we're getting new buffers, we don't clobber the stamp and
 193     * thus ignore the invalidate. */
 194    drawable->lastStamp = drawable->dri2.stamp;
 195
 196    if (unlikely(INTEL_DEBUG & DEBUG_DRI))
 197       fprintf(stderr, "enter %s, drawable %p\n", __func__, drawable);
 198
 199    intel_query_dri2_buffers(brw, drawable, &buffers, &count);
 200
 201    if (buffers == NULL)
 202       return;
 203
 204    for (i = 0; i < count; i++) {
 205        switch (buffers[i].attachment) {
 206        case __DRI_BUFFER_FRONT_LEFT:
 207            rb = intel_get_renderbuffer(fb, BUFFER_FRONT_LEFT);
 208            region_name = "dri2 front buffer";
 209            break;
 210
 211        case __DRI_BUFFER_FAKE_FRONT_LEFT:
 212            rb = intel_get_renderbuffer(fb, BUFFER_FRONT_LEFT);
 213            region_name = "dri2 fake front buffer";
 214            break;
 215
 216        case __DRI_BUFFER_BACK_LEFT:
 217            rb = intel_get_renderbuffer(fb, BUFFER_BACK_LEFT);
 218            region_name = "dri2 back buffer";
 219            break;
 220
 221        case __DRI_BUFFER_DEPTH:
 222        case __DRI_BUFFER_HIZ:
 223        case __DRI_BUFFER_DEPTH_STENCIL:
 224        case __DRI_BUFFER_STENCIL:
 225        case __DRI_BUFFER_ACCUM:
 226        default:
 227            fprintf(stderr,
 228                    "unhandled buffer attach event, attachment type %d\n",
 229                    buffers[i].attachment);
 230            return;
 231        }
 232
 233        intel_process_dri2_buffer(brw, drawable, &buffers[i], rb, region_name);
 234    }
 235
 236    driUpdateFramebufferSize(&intel->ctx, drawable);
 237 }
 238
 239 /**
 240  * intel_prepare_render should be called anywhere that curent read/drawbuffer
 241  * state is required.
 242  */
 243 void
 244 intel_prepare_render(struct brw_context *brw)
 245 {
 246    struct intel_context *intel = &brw->intel;
 247    __DRIcontext *driContext = intel->driContext;
 248    __DRIdrawable *drawable;
 249
 250    drawable = driContext->driDrawablePriv;
 251    if (drawable && drawable->dri2.stamp != driContext->dri2.draw_stamp) {
 252       if (drawable->lastStamp != drawable->dri2.stamp)
 253          intel_update_renderbuffers(driContext, drawable);
 254       driContext->dri2.draw_stamp = drawable->dri2.stamp;
 255    }
 256
 257    drawable = driContext->driReadablePriv;
 258    if (drawable && drawable->dri2.stamp != driContext->dri2.read_stamp) {
 259       if (drawable->lastStamp != drawable->dri2.stamp)
 260          intel_update_renderbuffers(driContext, drawable);
 261       driContext->dri2.read_stamp = drawable->dri2.stamp;
 262    }
 263
 264    /* If we're currently rendering to the front buffer, the rendering
 265     * that will happen next will probably dirty the front buffer.  So
 266     * mark it as dirty here.
 267     */
 268    if (intel->is_front_buffer_rendering)
 269       intel->front_buffer_dirty = true;
 270
 271    /* Wait for the swapbuffers before the one we just emitted, so we
 272     * don't get too many swaps outstanding for apps that are GPU-heavy
 273     * but not CPU-heavy.
 274     *
 275     * We're using intelDRI2Flush (called from the loader before
 276     * swapbuffer) and glFlush (for front buffer rendering) as the
 277     * indicator that a frame is done and then throttle when we get
 278     * here as we prepare to render the next frame.  At this point for
 279     * round trips for swap/copy and getting new buffers are done and
 280     * we'll spend less time waiting on the GPU.
 281     *
 282     * Unfortunately, we don't have a handle to the batch containing
 283     * the swap, and getting our hands on that doesn't seem worth it,
 284     * so we just us the first batch we emitted after the last swap.
 285     */
 286    if (intel->need_throttle && intel->first_post_swapbuffers_batch) {
 287       if (!intel->disable_throttling)
 288          drm_intel_bo_wait_rendering(intel->first_post_swapbuffers_batch);
 289       drm_intel_bo_unreference(intel->first_post_swapbuffers_batch);
 290       intel->first_post_swapbuffers_batch = NULL;
 291       intel->need_throttle = false;
 292    }
 293 }
 294
 295 static const struct dri_debug_control debug_control[] = {
 296    { "tex",   DEBUG_TEXTURE},
 297    { "state", DEBUG_STATE},
 298    { "ioctl", DEBUG_IOCTL},
 299    { "blit",  DEBUG_BLIT},
 300    { "mip",   DEBUG_MIPTREE},
 301    { "fall",  DEBUG_PERF},
 302    { "perf",  DEBUG_PERF},
 303    { "bat",   DEBUG_BATCH},
 304    { "pix",   DEBUG_PIXEL},
 305    { "buf",   DEBUG_BUFMGR},
 306    { "reg",   DEBUG_REGION},
 307    { "fbo",   DEBUG_FBO},
 308    { "fs",    DEBUG_WM },
 309    { "gs",    DEBUG_GS},
 310    { "sync",  DEBUG_SYNC},
 311    { "prim",  DEBUG_PRIMS },
 312    { "vert",  DEBUG_VERTS },
 313    { "dri",   DEBUG_DRI },
 314    { "sf",    DEBUG_SF },
 315    { "stats", DEBUG_STATS },
 316    { "wm",    DEBUG_WM },
 317    { "urb",   DEBUG_URB },
 318    { "vs",    DEBUG_VS },
 319    { "clip",  DEBUG_CLIP },
 320    { "aub",   DEBUG_AUB },
 321    { "shader_time", DEBUG_SHADER_TIME },
 322    { "no16",  DEBUG_NO16 },
 323    { "blorp", DEBUG_BLORP },
 324    { NULL,    0 }
 325 };
 326
 327
 328 static void
 329 intelInvalidateState(struct gl_context * ctx, GLuint new_state)
 330 {
 331     struct intel_context *intel = intel_context(ctx);
 332
 333     if (ctx->swrast_context)
 334        _swrast_InvalidateState(ctx, new_state);
 335    _vbo_InvalidateState(ctx, new_state);
 336
 337    intel->NewGLState |= new_state;
 338 }
 339
 340 void
 341 _intel_flush(struct gl_context *ctx, const char *file, int line)
 342 {
 343    struct brw_context *brw = brw_context(ctx);
 344    struct intel_context *intel = intel_context(ctx);
 345
 346    if (intel->batch.used)
 347       _intel_batchbuffer_flush(brw, file, line);
 348 }
 349
 350 static void
 351 intel_glFlush(struct gl_context *ctx)
 352 {
 353    struct intel_context *intel = intel_context(ctx);
 354
 355    intel_flush(ctx);
 356    intel_flush_front(ctx);
 357    if (intel->is_front_buffer_rendering)
 358       intel->need_throttle = true;
 359 }
 360
 361 void
 362 intelFinish(struct gl_context * ctx)
 363 {
 364    struct intel_context *intel = intel_context(ctx);
 365
 366    intel_flush(ctx);
 367    intel_flush_front(ctx);
 368
 369    if (intel->batch.last_bo)
 370       drm_intel_bo_wait_rendering(intel->batch.last_bo);
 371 }
 372
 373 void
 374 intelInitDriverFunctions(struct dd_function_table *functions)
 375 {
 376    _mesa_init_driver_functions(functions);
 377
 378    functions->Flush = intel_glFlush;
 379    functions->Finish = intelFinish;
 380    functions->GetString = intelGetString;
 381    functions->UpdateState = intelInvalidateState;
 382
 383    intelInitTextureFuncs(functions);
 384    intelInitTextureImageFuncs(functions);
 385    intelInitTextureSubImageFuncs(functions);
 386    intelInitTextureCopyImageFuncs(functions);
 387    intelInitClearFuncs(functions);
 388    intelInitBufferFuncs(functions);
 389    intelInitPixelFuncs(functions);
 390    intelInitBufferObjectFuncs(functions);
 391    intel_init_syncobj_functions(functions);
 392 }
 393
 394 static bool
 395 validate_context_version(struct intel_screen *screen,
 396                          int mesa_api,
 397                          unsigned major_version,
 398                          unsigned minor_version,
 399                          unsigned *dri_ctx_error)
 400 {
 401    unsigned req_version = 10 * major_version + minor_version;
 402    unsigned max_version = 0;
 403
 404    switch (mesa_api) {
 405    case API_OPENGL_COMPAT:
 406       max_version = screen->max_gl_compat_version;
 407       break;
 408    case API_OPENGL_CORE:
 409       max_version = screen->max_gl_core_version;
 410       break;
 411    case API_OPENGLES:
 412       max_version = screen->max_gl_es1_version;
 413       break;
 414    case API_OPENGLES2:
 415       max_version = screen->max_gl_es2_version;
 416       break;
 417    default:
 418       max_version = 0;
 419       break;
 420    }
 421
 422    if (max_version == 0) {
 423       *dri_ctx_error = __DRI_CTX_ERROR_BAD_API;
 424       return false;
 425    } else if (req_version > max_version) {
 426       *dri_ctx_error = __DRI_CTX_ERROR_BAD_VERSION;
 427       return false;
 428    }
 429
 430    return true;
 431 }
 432
 433 bool
 434 intelInitContext(struct brw_context *brw,
 435                  int api,
 436                  unsigned major_version,
 437                  unsigned minor_version,
 438                  const struct gl_config * mesaVis,
 439                  __DRIcontext * driContextPriv,
 440                  void *sharedContextPrivate,
 441                  struct dd_function_table *functions,
 442                  unsigned *dri_ctx_error)
 443 {
 444    struct intel_context *intel = &brw->intel;
 445    struct gl_context *ctx = &intel->ctx;
 446    struct gl_context *shareCtx = (struct gl_context *) sharedContextPrivate;
 447    __DRIscreen *sPriv = driContextPriv->driScreenPriv;
 448    struct intel_screen *intelScreen = sPriv->driverPrivate;
 449    int bo_reuse_mode;
 450    struct gl_config visual;
 451
 452    /* we can't do anything without a connection to the device */
 453    if (intelScreen->bufmgr == NULL) {
 454       *dri_ctx_error = __DRI_CTX_ERROR_NO_MEMORY;
 455       return false;
 456    }
 457
 458    if (!validate_context_version(intelScreen,
 459                                  api, major_version, minor_version,
 460                                  dri_ctx_error))
 461       return false;
 462
 463    if (mesaVis == NULL) {
 464       memset(&visual, 0, sizeof visual);
 465       mesaVis = &visual;
 466    }
 467
 468    intel->intelScreen = intelScreen;
 469
 470    if (!_mesa_initialize_context(&intel->ctx, api, mesaVis, shareCtx,
 471                                  functions)) {
 472       *dri_ctx_error = __DRI_CTX_ERROR_NO_MEMORY;
 473       printf("%s: failed to init mesa context\n", __FUNCTION__);
 474       return false;
 475    }
 476
 477    driContextPriv->driverPrivate = intel;
 478    intel->driContext = driContextPriv;
 479    intel->driFd = sPriv->fd;
 480
 481    intel->gen = intelScreen->gen;
 482
 483    const int devID = intelScreen->deviceID;
 484    if (IS_SNB_GT1(devID) || IS_IVB_GT1(devID) || IS_HSW_GT1(devID))
 485       intel->gt = 1;
 486    else if (IS_SNB_GT2(devID) || IS_IVB_GT2(devID) || IS_HSW_GT2(devID))
 487       intel->gt = 2;
 488    else if (IS_HSW_GT3(devID))
 489       intel->gt = 3;
 490    else
 491       intel->gt = 0;
 492
 493    if (IS_HASWELL(devID)) {
 494       intel->is_haswell = true;
 495    } else if (IS_BAYTRAIL(devID)) {
 496       intel->is_baytrail = true;
 497       intel->gt = 1;
 498    } else if (IS_G4X(devID)) {
 499       intel->is_g4x = true;
 500    }
 501
 502    intel->has_separate_stencil = intel->intelScreen->hw_has_separate_stencil;
 503    intel->must_use_separate_stencil = intel->intelScreen->hw_must_use_separate_stencil;
 504    intel->has_hiz = intel->gen >= 6;
 505    intel->has_llc = intel->intelScreen->hw_has_llc;
 506    intel->has_swizzling = intel->intelScreen->hw_has_swizzling;
 507
 508    memset(&ctx->TextureFormatSupported,
 509           0, sizeof(ctx->TextureFormatSupported));
 510
 511    driParseConfigFiles(&brw->optionCache, &intelScreen->optionCache,
 512                        sPriv->myNum, "i965");
 513
 514    /* Estimate the size of the mappable aperture into the GTT.  There's an
 515     * ioctl to get the whole GTT size, but not one to get the mappable subset.
 516     * It turns out it's basically always 256MB, though some ancient hardware
 517     * was smaller.
 518     */
 519    uint32_t gtt_size = 256 * 1024 * 1024;
 520
 521    /* We don't want to map two objects such that a memcpy between them would
 522     * just fault one mapping in and then the other over and over forever.  So
 523     * we would need to divide the GTT size by 2.  Additionally, some GTT is
 524     * taken up by things like the framebuffer and the ringbuffer and such, so
 525     * be more conservative.
 526     */
 527    intel->max_gtt_map_object_size = gtt_size / 4;
 528
 529    intel->bufmgr = intelScreen->bufmgr;
 530
 531    bo_reuse_mode = driQueryOptioni(&brw->optionCache, "bo_reuse");
 532    switch (bo_reuse_mode) {
 533    case DRI_CONF_BO_REUSE_DISABLED:
 534       break;
 535    case DRI_CONF_BO_REUSE_ALL:
 536       intel_bufmgr_gem_enable_reuse(intel->bufmgr);
 537       break;
 538    }
 539
 540    /* Initialize the software rasterizer and helper modules.
 541     *
 542     * As of GL 3.1 core, the gen4+ driver doesn't need the swrast context for
 543     * software fallbacks (which we have to support on legacy GL to do weird
 544     * glDrawPixels(), glBitmap(), and other functions).
 545     */
 546    if (api != API_OPENGL_CORE) {
 547       _swrast_CreateContext(ctx);
 548    }
 549
 550    _vbo_CreateContext(ctx);
 551    if (ctx->swrast_context) {
 552       _tnl_CreateContext(ctx);
 553       _swsetup_CreateContext(ctx);
 554
 555       /* Configure swrast to match hardware characteristics: */
 556       _swrast_allow_pixel_fog(ctx, false);
 557       _swrast_allow_vertex_fog(ctx, true);
 558    }
 559
 560    _mesa_meta_init(ctx);
 561
 562    intelInitExtensions(ctx);
 563
 564    INTEL_DEBUG = driParseDebugString(getenv("INTEL_DEBUG"), debug_control);
 565    if (INTEL_DEBUG & DEBUG_BUFMGR)
 566       dri_bufmgr_set_debug(intel->bufmgr, true);
 567    if ((INTEL_DEBUG & DEBUG_SHADER_TIME) && intel->gen < 7) {
 568       fprintf(stderr,
 569               "shader_time debugging requires gen7 (Ivybridge) or better.\n");
 570       INTEL_DEBUG &= ~DEBUG_SHADER_TIME;
 571    }
 572    if (INTEL_DEBUG & DEBUG_PERF)
 573       intel->perf_debug = true;
 574
 575    if (INTEL_DEBUG & DEBUG_AUB)
 576       drm_intel_bufmgr_gem_set_aub_dump(intel->bufmgr, true);
 577
 578    intel_batchbuffer_init(brw);
 579
 580    intel_fbo_init(brw);
 581
 582    if (!driQueryOptionb(&brw->optionCache, "hiz")) {
 583        intel->has_hiz = false;
 584        /* On gen6, you can only do separate stencil with HIZ. */
 585        if (intel->gen == 6)
 586           intel->has_separate_stencil = false;
 587    }
 588
 589    if (driQueryOptionb(&brw->optionCache, "always_flush_batch")) {
 590       fprintf(stderr, "flushing batchbuffer before/after each draw call\n");
 591       intel->always_flush_batch = 1;
 592    }
 593
 594    if (driQueryOptionb(&brw->optionCache, "always_flush_cache")) {
 595       fprintf(stderr, "flushing GPU caches before/after each draw call\n");
 596       intel->always_flush_cache = 1;
 597    }
 598
 599    if (driQueryOptionb(&brw->optionCache, "disable_throttling")) {
 600       fprintf(stderr, "disabling flush throttling\n");
 601       intel->disable_throttling = 1;
 602    }
 603
 604    return true;
 605 }
 606
 607 void
 608 intelDestroyContext(__DRIcontext * driContextPriv)
 609 {
 610    struct brw_context *brw =
 611       (struct brw_context *) driContextPriv->driverPrivate;
 612    struct intel_context *intel = &brw->intel;
 613    struct gl_context *ctx = &intel->ctx;
 614
 615    assert(intel);               /* should never be null */
 616    if (intel) {
 617       /* Dump a final BMP in case the application doesn't call SwapBuffers */
 618       if (INTEL_DEBUG & DEBUG_AUB) {
 619          intel_batchbuffer_flush(brw);
 620          aub_dump_bmp(&intel->ctx);
 621       }
 622
 623       _mesa_meta_free(&intel->ctx);
 624
 625       brw->vtbl.destroy(brw);
 626
 627       if (ctx->swrast_context) {
 628          _swsetup_DestroyContext(&intel->ctx);
 629          _tnl_DestroyContext(&intel->ctx);
 630       }
 631       _vbo_DestroyContext(&intel->ctx);
 632
 633       if (ctx->swrast_context)
 634          _swrast_DestroyContext(&intel->ctx);
 635
 636       intel_batchbuffer_free(brw);
 637
 638       drm_intel_bo_unreference(intel->first_post_swapbuffers_batch);
 639       intel->first_post_swapbuffers_batch = NULL;
 640
 641       driDestroyOptionCache(&brw->optionCache);
 642
 643       /* free the Mesa context */
 644       _mesa_free_context_data(&intel->ctx);
 645
 646       ralloc_free(intel);
 647       driContextPriv->driverPrivate = NULL;
 648    }
 649 }
 650
 651 GLboolean
 652 intelUnbindContext(__DRIcontext * driContextPriv)
 653 {
 654    /* Unset current context and dispath table */
 655    _mesa_make_current(NULL, NULL, NULL);
 656
 657    return true;
 658 }
 659
 660 /**
 661  * Fixes up the context for GLES23 with our default-to-sRGB-capable behavior
 662  * on window system framebuffers.
 663  *
 664  * Desktop GL is fairly reasonable in its handling of sRGB: You can ask if
 665  * your renderbuffer can do sRGB encode, and you can flip a switch that does
 666  * sRGB encode if the renderbuffer can handle it.  You can ask specifically
 667  * for a visual where you're guaranteed to be capable, but it turns out that
 668  * everyone just makes all their ARGB8888 visuals capable and doesn't offer
 669  * incapable ones, becuase there's no difference between the two in resources
 670  * used.  Applications thus get built that accidentally rely on the default
 671  * visual choice being sRGB, so we make ours sRGB capable.  Everything sounds
 672  * great...
 673  *
 674  * But for GLES2/3, they decided that it was silly to not turn on sRGB encode
 675  * for sRGB renderbuffers you made with the GL_EXT_texture_sRGB equivalent.
 676  * So they removed the enable knob and made it "if the renderbuffer is sRGB
 677  * capable, do sRGB encode".  Then, for your window system renderbuffers, you
 678  * can ask for sRGB visuals and get sRGB encode, or not ask for sRGB visuals
 679  * and get no sRGB encode (assuming that both kinds of visual are available).
 680  * Thus our choice to support sRGB by default on our visuals for desktop would
 681  * result in broken rendering of GLES apps that aren't expecting sRGB encode.
 682  *
 683  * Unfortunately, renderbuffer setup happens before a context is created.  So
 684  * in intel_screen.c we always set up sRGB, and here, if you're a GLES2/3
 685  * context (without an sRGB visual, though we don't have sRGB visuals exposed
 686  * yet), we go turn that back off before anyone finds out.
 687  */
 688 static void
 689 intel_gles3_srgb_workaround(struct brw_context *brw,
 690                             struct gl_framebuffer *fb)
 691 {
 692    struct intel_context *intel = &brw->intel;
 693    struct gl_context *ctx = &intel->ctx;
 694
 695    if (_mesa_is_desktop_gl(ctx) || !fb->Visual.sRGBCapable)
 696       return;
 697
 698    /* Some day when we support the sRGB capable bit on visuals available for
 699     * GLES, we'll need to respect that and not disable things here.
 700     */
 701    fb->Visual.sRGBCapable = false;
 702    for (int i = 0; i < BUFFER_COUNT; i++) {
 703       if (fb->Attachment[i].Renderbuffer &&
 704           fb->Attachment[i].Renderbuffer->Format == MESA_FORMAT_SARGB8) {
 705          fb->Attachment[i].Renderbuffer->Format = MESA_FORMAT_ARGB8888;
 706       }
 707    }
 708 }
 709
 710 GLboolean
 711 intelMakeCurrent(__DRIcontext * driContextPriv,
 712                  __DRIdrawable * driDrawPriv,
 713                  __DRIdrawable * driReadPriv)
 714 {
 715    struct brw_context *brw;
 716    GET_CURRENT_CONTEXT(curCtx);
 717
 718    if (driContextPriv)
 719       brw = (struct brw_context *) driContextPriv->driverPrivate;
 720    else
 721       brw = NULL;
 722
 723    /* According to the glXMakeCurrent() man page: "Pending commands to
 724     * the previous context, if any, are flushed before it is released."
 725     * But only flush if we're actually changing contexts.
 726     */
 727    if (brw_context(curCtx) && brw_context(curCtx) != brw) {
 728       _mesa_flush(curCtx);
 729    }
 730
 731    struct intel_context *intel = &brw->intel;
 732
 733    if (driContextPriv) {
 734       struct gl_context *ctx = &intel->ctx;
 735       struct gl_framebuffer *fb, *readFb;
 736
 737       if (driDrawPriv == NULL && driReadPriv == NULL) {
 738          fb = _mesa_get_incomplete_framebuffer();
 739          readFb = _mesa_get_incomplete_framebuffer();
 740       } else {
 741          fb = driDrawPriv->driverPrivate;
 742          readFb = driReadPriv->driverPrivate;
 743          driContextPriv->dri2.draw_stamp = driDrawPriv->dri2.stamp - 1;
 744          driContextPriv->dri2.read_stamp = driReadPriv->dri2.stamp - 1;
 745       }
 746
 747       intel_prepare_render(brw);
 748       _mesa_make_current(ctx, fb, readFb);
 749
 750       intel_gles3_srgb_workaround(brw, ctx->WinSysDrawBuffer);
 751       intel_gles3_srgb_workaround(brw, ctx->WinSysReadBuffer);
 752    }
 753    else {
 754       _mesa_make_current(NULL, NULL, NULL);
 755    }
 756
 757    return true;
 758 }
 759
 760 /**
 761  * \brief Query DRI2 to obtain a DRIdrawable's buffers.
 762  *
 763  * To determine which DRI buffers to request, examine the renderbuffers
 764  * attached to the drawable's framebuffer. Then request the buffers with
 765  * DRI2GetBuffers() or DRI2GetBuffersWithFormat().
 766  *
 767  * This is called from intel_update_renderbuffers().
 768  *
 769  * \param drawable      Drawable whose buffers are queried.
 770  * \param buffers       [out] List of buffers returned by DRI2 query.
 771  * \param buffer_count  [out] Number of buffers returned.
 772  *
 773  * \see intel_update_renderbuffers()
 774  * \see DRI2GetBuffers()
 775  * \see DRI2GetBuffersWithFormat()
 776  */
 777 static void
 778 intel_query_dri2_buffers(struct brw_context *brw,
 779                          __DRIdrawable *drawable,
 780                          __DRIbuffer **buffers,
 781                          int *buffer_count)
 782 {
 783    struct intel_context *intel = &brw->intel;
 784    __DRIscreen *screen = intel->intelScreen->driScrnPriv;
 785    struct gl_framebuffer *fb = drawable->driverPrivate;
 786    int i = 0;
 787    unsigned attachments[8];
 788
 789    struct intel_renderbuffer *front_rb;
 790    struct intel_renderbuffer *back_rb;
 791
 792    front_rb = intel_get_renderbuffer(fb, BUFFER_FRONT_LEFT);
 793    back_rb = intel_get_renderbuffer(fb, BUFFER_BACK_LEFT);
 794
 795    memset(attachments, 0, sizeof(attachments));
 796    if ((intel->is_front_buffer_rendering ||
 797         intel->is_front_buffer_reading ||
 798         !back_rb) && front_rb) {
 799       /* If a fake front buffer is in use, then querying for
 800        * __DRI_BUFFER_FRONT_LEFT will cause the server to copy the image from
 801        * the real front buffer to the fake front buffer.  So before doing the
 802        * query, we need to make sure all the pending drawing has landed in the
 803        * real front buffer.
 804        */
 805       intel_flush(&intel->ctx);
 806       intel_flush_front(&intel->ctx);
 807
 808       attachments[i++] = __DRI_BUFFER_FRONT_LEFT;
 809       attachments[i++] = intel_bits_per_pixel(front_rb);
 810    } else if (front_rb && intel->front_buffer_dirty) {
 811       /* We have pending front buffer rendering, but we aren't querying for a
 812        * front buffer.  If the front buffer we have is a fake front buffer,
 813        * the X server is going to throw it away when it processes the query.
 814        * So before doing the query, make sure all the pending drawing has
 815        * landed in the real front buffer.
 816        */
 817       intel_flush(&intel->ctx);
 818       intel_flush_front(&intel->ctx);
 819    }
 820
 821    if (back_rb) {
 822       attachments[i++] = __DRI_BUFFER_BACK_LEFT;
 823       attachments[i++] = intel_bits_per_pixel(back_rb);
 824    }
 825
 826    assert(i <= ARRAY_SIZE(attachments));
 827
 828    *buffers = screen->dri2.loader->getBuffersWithFormat(drawable,
 829                                                         &drawable->w,
 830                                                         &drawable->h,
 831                                                         attachments, i / 2,
 832                                                         buffer_count,
 833                                                         drawable->loaderPrivate);
 834 }
 835
 836 /**
 837  * \brief Assign a DRI buffer's DRM region to a renderbuffer.
 838  *
 839  * This is called from intel_update_renderbuffers().
 840  *
 841  * \par Note:
 842  *    DRI buffers whose attachment point is DRI2BufferStencil or
 843  *    DRI2BufferDepthStencil are handled as special cases.
 844  *
 845  * \param buffer_name is a human readable name, such as "dri2 front buffer",
 846  *        that is passed to intel_region_alloc_for_handle().
 847  *
 848  * \see intel_update_renderbuffers()
 849  * \see intel_region_alloc_for_handle()
 850  */
 851 static void
 852 intel_process_dri2_buffer(struct brw_context *brw,
 853                           __DRIdrawable *drawable,
 854                           __DRIbuffer *buffer,
 855                           struct intel_renderbuffer *rb,
 856                           const char *buffer_name)
 857 {
 858    struct intel_context *intel = &brw->intel;
 859    struct intel_region *region = NULL;
 860
 861    if (!rb)
 862       return;
 863
 864    unsigned num_samples = rb->Base.Base.NumSamples;
 865
 866    /* We try to avoid closing and reopening the same BO name, because the first
 867     * use of a mapping of the buffer involves a bunch of page faulting which is
 868     * moderately expensive.
 869     */
 870    if (num_samples == 0) {
 871        if (rb->mt &&
 872            rb->mt->region &&
 873            rb->mt->region->name == buffer->name)
 874           return;
 875    } else {
 876        if (rb->mt &&
 877            rb->mt->singlesample_mt &&
 878            rb->mt->singlesample_mt->region &&
 879            rb->mt->singlesample_mt->region->name == buffer->name)
 880           return;
 881    }
 882
 883    if (unlikely(INTEL_DEBUG & DEBUG_DRI)) {
 884       fprintf(stderr,
 885               "attaching buffer %d, at %d, cpp %d, pitch %d\n",
 886               buffer->name, buffer->attachment,
 887               buffer->cpp, buffer->pitch);
 888    }
 889
 890    intel_miptree_release(&rb->mt);
 891    region = intel_region_alloc_for_handle(intel->intelScreen,
 892                                           buffer->cpp,
 893                                           drawable->w,
 894                                           drawable->h,
 895                                           buffer->pitch,
 896                                           buffer->name,
 897                                           buffer_name);
 898    if (!region)
 899       return;
 900
 901    rb->mt = intel_miptree_create_for_dri2_buffer(brw,
 902                                                  buffer->attachment,
 903                                                  intel_rb_format(rb),
 904                                                  num_samples,
 905                                                  region);
 906    intel_region_release(&region);
 907 }