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