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    if (brw->gen < 6) {
  98       /* MSAA and fast color clear are not supported, so don't waste time
  99        * checking whether a resolve is needed.
 100        */
 101       return;
 102    }
 103
 104    struct gl_framebuffer *fb = drawable->driverPrivate;
 105    struct intel_renderbuffer *rb;
 106
 107    /* Usually, only the back buffer will need to be downsampled. However,
 108     * the front buffer will also need it if the user has rendered into it.
 109     */
 110    static const gl_buffer_index buffers[2] = {
 111          BUFFER_BACK_LEFT,
 112          BUFFER_FRONT_LEFT,
 113    };
 114
 115    for (int i = 0; i < 2; ++i) {
 116       rb = intel_get_renderbuffer(fb, buffers[i]);
 117       if (rb == NULL || rb->mt == NULL)
 118          continue;
 119       if (rb->mt->num_samples <= 1)
 120          intel_miptree_resolve_color(brw, rb->mt);
 121       else
 122          intel_miptree_downsample(brw, rb->mt);
 123    }
 124 }
 125
 126 static void
 127 intel_flush_front(struct gl_context *ctx)
 128 {
 129    struct brw_context *brw = brw_context(ctx);
 130     __DRIcontext *driContext = brw->driContext;
 131     __DRIdrawable *driDrawable = driContext->driDrawablePriv;
 132     __DRIscreen *const screen = brw->intelScreen->driScrnPriv;
 133
 134     if (brw->front_buffer_dirty && _mesa_is_winsys_fbo(ctx->DrawBuffer)) {
 135       if (screen->dri2.loader->flushFrontBuffer != NULL &&
 136           driDrawable &&
 137           driDrawable->loaderPrivate) {
 138
 139          /* Resolve before flushing FAKE_FRONT_LEFT to FRONT_LEFT.
 140           *
 141           * This potentially resolves both front and back buffer. It
 142           * is unnecessary to resolve the back, but harms nothing except
 143           * performance. And no one cares about front-buffer render
 144           * performance.
 145           */
 146          intel_resolve_for_dri2_flush(brw, driDrawable);
 147
 148          screen->dri2.loader->flushFrontBuffer(driDrawable,
 149                                                driDrawable->loaderPrivate);
 150
 151          /* We set the dirty bit in intel_prepare_render() if we're
 152           * front buffer rendering once we get there.
 153           */
 154          brw->front_buffer_dirty = false;
 155       }
 156    }
 157 }
 158
 159 static unsigned
 160 intel_bits_per_pixel(const struct intel_renderbuffer *rb)
 161 {
 162    return _mesa_get_format_bytes(intel_rb_format(rb)) * 8;
 163 }
 164
 165 static void
 166 intel_query_dri2_buffers(struct brw_context *brw,
 167                          __DRIdrawable *drawable,
 168                          __DRIbuffer **buffers,
 169                          int *count);
 170
 171 static void
 172 intel_process_dri2_buffer(struct brw_context *brw,
 173                           __DRIdrawable *drawable,
 174                           __DRIbuffer *buffer,
 175                           struct intel_renderbuffer *rb,
 176                           const char *buffer_name);
 177
 178 void
 179 intel_update_renderbuffers(__DRIcontext *context, __DRIdrawable *drawable)
 180 {
 181    struct gl_framebuffer *fb = drawable->driverPrivate;
 182    struct intel_renderbuffer *rb;
 183    struct brw_context *brw = context->driverPrivate;
 184    __DRIbuffer *buffers = NULL;
 185    int i, count;
 186    const char *region_name;
 187
 188    /* Set this up front, so that in case our buffers get invalidated
 189     * while we're getting new buffers, we don't clobber the stamp and
 190     * thus ignore the invalidate. */
 191    drawable->lastStamp = drawable->dri2.stamp;
 192
 193    if (unlikely(INTEL_DEBUG & DEBUG_DRI))
 194       fprintf(stderr, "enter %s, drawable %p\n", __func__, drawable);
 195
 196    intel_query_dri2_buffers(brw, drawable, &buffers, &count);
 197
 198    if (buffers == NULL)
 199       return;
 200
 201    for (i = 0; i < count; i++) {
 202        switch (buffers[i].attachment) {
 203        case __DRI_BUFFER_FRONT_LEFT:
 204            rb = intel_get_renderbuffer(fb, BUFFER_FRONT_LEFT);
 205            region_name = "dri2 front buffer";
 206            break;
 207
 208        case __DRI_BUFFER_FAKE_FRONT_LEFT:
 209            rb = intel_get_renderbuffer(fb, BUFFER_FRONT_LEFT);
 210            region_name = "dri2 fake front buffer";
 211            break;
 212
 213        case __DRI_BUFFER_BACK_LEFT:
 214            rb = intel_get_renderbuffer(fb, BUFFER_BACK_LEFT);
 215            region_name = "dri2 back buffer";
 216            break;
 217
 218        case __DRI_BUFFER_DEPTH:
 219        case __DRI_BUFFER_HIZ:
 220        case __DRI_BUFFER_DEPTH_STENCIL:
 221        case __DRI_BUFFER_STENCIL:
 222        case __DRI_BUFFER_ACCUM:
 223        default:
 224            fprintf(stderr,
 225                    "unhandled buffer attach event, attachment type %d\n",
 226                    buffers[i].attachment);
 227            return;
 228        }
 229
 230        intel_process_dri2_buffer(brw, drawable, &buffers[i], rb, region_name);
 231    }
 232
 233    driUpdateFramebufferSize(&brw->ctx, drawable);
 234 }
 235
 236 /**
 237  * intel_prepare_render should be called anywhere that curent read/drawbuffer
 238  * state is required.
 239  */
 240 void
 241 intel_prepare_render(struct brw_context *brw)
 242 {
 243    __DRIcontext *driContext = brw->driContext;
 244    __DRIdrawable *drawable;
 245
 246    drawable = driContext->driDrawablePriv;
 247    if (drawable && drawable->dri2.stamp != driContext->dri2.draw_stamp) {
 248       if (drawable->lastStamp != drawable->dri2.stamp)
 249          intel_update_renderbuffers(driContext, drawable);
 250       driContext->dri2.draw_stamp = drawable->dri2.stamp;
 251    }
 252
 253    drawable = driContext->driReadablePriv;
 254    if (drawable && drawable->dri2.stamp != driContext->dri2.read_stamp) {
 255       if (drawable->lastStamp != drawable->dri2.stamp)
 256          intel_update_renderbuffers(driContext, drawable);
 257       driContext->dri2.read_stamp = drawable->dri2.stamp;
 258    }
 259
 260    /* If we're currently rendering to the front buffer, the rendering
 261     * that will happen next will probably dirty the front buffer.  So
 262     * mark it as dirty here.
 263     */
 264    if (brw->is_front_buffer_rendering)
 265       brw->front_buffer_dirty = true;
 266
 267    /* Wait for the swapbuffers before the one we just emitted, so we
 268     * don't get too many swaps outstanding for apps that are GPU-heavy
 269     * but not CPU-heavy.
 270     *
 271     * We're using intelDRI2Flush (called from the loader before
 272     * swapbuffer) and glFlush (for front buffer rendering) as the
 273     * indicator that a frame is done and then throttle when we get
 274     * here as we prepare to render the next frame.  At this point for
 275     * round trips for swap/copy and getting new buffers are done and
 276     * we'll spend less time waiting on the GPU.
 277     *
 278     * Unfortunately, we don't have a handle to the batch containing
 279     * the swap, and getting our hands on that doesn't seem worth it,
 280     * so we just us the first batch we emitted after the last swap.
 281     */
 282    if (brw->need_throttle && brw->first_post_swapbuffers_batch) {
 283       if (!brw->disable_throttling)
 284          drm_intel_bo_wait_rendering(brw->first_post_swapbuffers_batch);
 285       drm_intel_bo_unreference(brw->first_post_swapbuffers_batch);
 286       brw->first_post_swapbuffers_batch = NULL;
 287       brw->need_throttle = false;
 288    }
 289 }
 290
 291 static void
 292 intel_viewport(struct gl_context *ctx, GLint x, GLint y, GLsizei w, GLsizei h)
 293 {
 294     struct brw_context *brw = brw_context(ctx);
 295     __DRIcontext *driContext = brw->driContext;
 296
 297     if (brw->saved_viewport)
 298         brw->saved_viewport(ctx, x, y, w, h);
 299
 300     if (_mesa_is_winsys_fbo(ctx->DrawBuffer)) {
 301        dri2InvalidateDrawable(driContext->driDrawablePriv);
 302        dri2InvalidateDrawable(driContext->driReadablePriv);
 303     }
 304 }
 305
 306 static const struct dri_debug_control debug_control[] = {
 307    { "tex",   DEBUG_TEXTURE},
 308    { "state", DEBUG_STATE},
 309    { "ioctl", DEBUG_IOCTL},
 310    { "blit",  DEBUG_BLIT},
 311    { "mip",   DEBUG_MIPTREE},
 312    { "fall",  DEBUG_PERF},
 313    { "perf",  DEBUG_PERF},
 314    { "bat",   DEBUG_BATCH},
 315    { "pix",   DEBUG_PIXEL},
 316    { "buf",   DEBUG_BUFMGR},
 317    { "reg",   DEBUG_REGION},
 318    { "fbo",   DEBUG_FBO},
 319    { "fs",    DEBUG_WM },
 320    { "gs",    DEBUG_GS},
 321    { "sync",  DEBUG_SYNC},
 322    { "prim",  DEBUG_PRIMS },
 323    { "vert",  DEBUG_VERTS },
 324    { "dri",   DEBUG_DRI },
 325    { "sf",    DEBUG_SF },
 326    { "stats", DEBUG_STATS },
 327    { "wm",    DEBUG_WM },
 328    { "urb",   DEBUG_URB },
 329    { "vs",    DEBUG_VS },
 330    { "clip",  DEBUG_CLIP },
 331    { "aub",   DEBUG_AUB },
 332    { "shader_time", DEBUG_SHADER_TIME },
 333    { "no16",  DEBUG_NO16 },
 334    { "blorp", DEBUG_BLORP },
 335    { "vue",   DEBUG_VUE },
 336    { NULL,    0 }
 337 };
 338
 339
 340 static void
 341 intelInvalidateState(struct gl_context * ctx, GLuint new_state)
 342 {
 343    struct brw_context *brw = brw_context(ctx);
 344
 345     if (ctx->swrast_context)
 346        _swrast_InvalidateState(ctx, new_state);
 347    _vbo_InvalidateState(ctx, new_state);
 348
 349    brw->NewGLState |= new_state;
 350 }
 351
 352 void
 353 _intel_flush(struct gl_context *ctx, const char *file, int line)
 354 {
 355    struct brw_context *brw = brw_context(ctx);
 356
 357    if (brw->batch.used)
 358       _intel_batchbuffer_flush(brw, file, line);
 359 }
 360
 361 static void
 362 intel_glFlush(struct gl_context *ctx)
 363 {
 364    struct brw_context *brw = brw_context(ctx);
 365
 366    intel_flush(ctx);
 367    intel_flush_front(ctx);
 368    if (brw->is_front_buffer_rendering)
 369       brw->need_throttle = true;
 370 }
 371
 372 void
 373 intelFinish(struct gl_context * ctx)
 374 {
 375    struct brw_context *brw = brw_context(ctx);
 376
 377    intel_flush(ctx);
 378    intel_flush_front(ctx);
 379
 380    if (brw->batch.last_bo)
 381       drm_intel_bo_wait_rendering(brw->batch.last_bo);
 382 }
 383
 384 void
 385 intelInitDriverFunctions(struct dd_function_table *functions)
 386 {
 387    _mesa_init_driver_functions(functions);
 388
 389    functions->Flush = intel_glFlush;
 390    functions->Finish = intelFinish;
 391    functions->GetString = intelGetString;
 392    functions->UpdateState = intelInvalidateState;
 393
 394    intelInitTextureFuncs(functions);
 395    intelInitTextureImageFuncs(functions);
 396    intelInitTextureSubImageFuncs(functions);
 397    intelInitTextureCopyImageFuncs(functions);
 398    intelInitClearFuncs(functions);
 399    intelInitBufferFuncs(functions);
 400    intelInitPixelFuncs(functions);
 401    intelInitBufferObjectFuncs(functions);
 402    intel_init_syncobj_functions(functions);
 403    brw_init_object_purgeable_functions(functions);
 404 }
 405
 406 static bool
 407 validate_context_version(struct intel_screen *screen,
 408                          int mesa_api,
 409                          unsigned major_version,
 410                          unsigned minor_version,
 411                          unsigned *dri_ctx_error)
 412 {
 413    unsigned req_version = 10 * major_version + minor_version;
 414    unsigned max_version = 0;
 415
 416    switch (mesa_api) {
 417    case API_OPENGL_COMPAT:
 418       max_version = screen->max_gl_compat_version;
 419       break;
 420    case API_OPENGL_CORE:
 421       max_version = screen->max_gl_core_version;
 422       break;
 423    case API_OPENGLES:
 424       max_version = screen->max_gl_es1_version;
 425       break;
 426    case API_OPENGLES2:
 427       max_version = screen->max_gl_es2_version;
 428       break;
 429    default:
 430       max_version = 0;
 431       break;
 432    }
 433
 434    if (max_version == 0) {
 435       *dri_ctx_error = __DRI_CTX_ERROR_BAD_API;
 436       return false;
 437    } else if (req_version > max_version) {
 438       *dri_ctx_error = __DRI_CTX_ERROR_BAD_VERSION;
 439       return false;
 440    }
 441
 442    return true;
 443 }
 444
 445 bool
 446 intelInitContext(struct brw_context *brw,
 447                  int api,
 448                  unsigned major_version,
 449                  unsigned minor_version,
 450                  const struct gl_config * mesaVis,
 451                  __DRIcontext * driContextPriv,
 452                  void *sharedContextPrivate,
 453                  struct dd_function_table *functions,
 454                  unsigned *dri_ctx_error)
 455 {
 456    struct gl_context *ctx = &brw->ctx;
 457    struct gl_context *shareCtx = (struct gl_context *) sharedContextPrivate;
 458    __DRIscreen *sPriv = driContextPriv->driScreenPriv;
 459    struct intel_screen *intelScreen = sPriv->driverPrivate;
 460    int bo_reuse_mode;
 461    struct gl_config visual;
 462
 463    /* we can't do anything without a connection to the device */
 464    if (intelScreen->bufmgr == NULL) {
 465       *dri_ctx_error = __DRI_CTX_ERROR_NO_MEMORY;
 466       return false;
 467    }
 468
 469    if (!validate_context_version(intelScreen,
 470                                  api, major_version, minor_version,
 471                                  dri_ctx_error))
 472       return false;
 473
 474    /* Can't rely on invalidate events, fall back to glViewport hack */
 475    if (!driContextPriv->driScreenPriv->dri2.useInvalidate) {
 476       brw->saved_viewport = functions->Viewport;
 477       functions->Viewport = intel_viewport;
 478    }
 479
 480    if (mesaVis == NULL) {
 481       memset(&visual, 0, sizeof visual);
 482       mesaVis = &visual;
 483    }
 484
 485    brw->intelScreen = intelScreen;
 486    brw->bufmgr = intelScreen->bufmgr;
 487
 488    if (!_mesa_initialize_context(&brw->ctx, api, mesaVis, shareCtx,
 489                                  functions)) {
 490       *dri_ctx_error = __DRI_CTX_ERROR_NO_MEMORY;
 491       printf("%s: failed to init mesa context\n", __FUNCTION__);
 492       return false;
 493    }
 494
 495    driContextPriv->driverPrivate = brw;
 496    brw->driContext = driContextPriv;
 497
 498    brw->gen = intelScreen->gen;
 499
 500    const int devID = intelScreen->deviceID;
 501    if (IS_SNB_GT1(devID) || IS_IVB_GT1(devID) || IS_HSW_GT1(devID))
 502       brw->gt = 1;
 503    else if (IS_SNB_GT2(devID) || IS_IVB_GT2(devID) || IS_HSW_GT2(devID))
 504       brw->gt = 2;
 505    else if (IS_HSW_GT3(devID))
 506       brw->gt = 3;
 507    else
 508       brw->gt = 0;
 509
 510    if (IS_HASWELL(devID)) {
 511       brw->is_haswell = true;
 512    } else if (IS_BAYTRAIL(devID)) {
 513       brw->is_baytrail = true;
 514       brw->gt = 1;
 515    } else if (IS_G4X(devID)) {
 516       brw->is_g4x = true;
 517    }
 518
 519    brw->has_separate_stencil = brw->intelScreen->hw_has_separate_stencil;
 520    brw->must_use_separate_stencil = brw->intelScreen->hw_must_use_separate_stencil;
 521    brw->has_hiz = brw->gen >= 6;
 522    brw->has_llc = brw->intelScreen->hw_has_llc;
 523    brw->has_swizzling = brw->intelScreen->hw_has_swizzling;
 524
 525    memset(&ctx->TextureFormatSupported,
 526           0, sizeof(ctx->TextureFormatSupported));
 527
 528    driParseConfigFiles(&brw->optionCache, &intelScreen->optionCache,
 529                        sPriv->myNum, "i965");
 530
 531    /* Estimate the size of the mappable aperture into the GTT.  There's an
 532     * ioctl to get the whole GTT size, but not one to get the mappable subset.
 533     * It turns out it's basically always 256MB, though some ancient hardware
 534     * was smaller.
 535     */
 536    uint32_t gtt_size = 256 * 1024 * 1024;
 537
 538    /* We don't want to map two objects such that a memcpy between them would
 539     * just fault one mapping in and then the other over and over forever.  So
 540     * we would need to divide the GTT size by 2.  Additionally, some GTT is
 541     * taken up by things like the framebuffer and the ringbuffer and such, so
 542     * be more conservative.
 543     */
 544    brw->max_gtt_map_object_size = gtt_size / 4;
 545
 546    bo_reuse_mode = driQueryOptioni(&brw->optionCache, "bo_reuse");
 547    switch (bo_reuse_mode) {
 548    case DRI_CONF_BO_REUSE_DISABLED:
 549       break;
 550    case DRI_CONF_BO_REUSE_ALL:
 551       intel_bufmgr_gem_enable_reuse(brw->bufmgr);
 552       break;
 553    }
 554
 555    /* Initialize the software rasterizer and helper modules.
 556     *
 557     * As of GL 3.1 core, the gen4+ driver doesn't need the swrast context for
 558     * software fallbacks (which we have to support on legacy GL to do weird
 559     * glDrawPixels(), glBitmap(), and other functions).
 560     */
 561    if (api != API_OPENGL_CORE && api != API_OPENGLES2) {
 562       _swrast_CreateContext(ctx);
 563    }
 564
 565    _vbo_CreateContext(ctx);
 566    if (ctx->swrast_context) {
 567       _tnl_CreateContext(ctx);
 568       _swsetup_CreateContext(ctx);
 569
 570       /* Configure swrast to match hardware characteristics: */
 571       _swrast_allow_pixel_fog(ctx, false);
 572       _swrast_allow_vertex_fog(ctx, true);
 573    }
 574
 575    _mesa_meta_init(ctx);
 576
 577    intelInitExtensions(ctx);
 578
 579    INTEL_DEBUG = driParseDebugString(getenv("INTEL_DEBUG"), debug_control);
 580    if (INTEL_DEBUG & DEBUG_BUFMGR)
 581       dri_bufmgr_set_debug(brw->bufmgr, true);
 582    if ((INTEL_DEBUG & DEBUG_SHADER_TIME) && brw->gen < 7) {
 583       fprintf(stderr,
 584               "shader_time debugging requires gen7 (Ivybridge) or better.\n");
 585       INTEL_DEBUG &= ~DEBUG_SHADER_TIME;
 586    }
 587    if (INTEL_DEBUG & DEBUG_PERF)
 588       brw->perf_debug = true;
 589
 590    if (INTEL_DEBUG & DEBUG_AUB)
 591       drm_intel_bufmgr_gem_set_aub_dump(brw->bufmgr, true);
 592
 593    intel_batchbuffer_init(brw);
 594
 595    intel_fbo_init(brw);
 596
 597    if (!driQueryOptionb(&brw->optionCache, "hiz")) {
 598        brw->has_hiz = false;
 599        /* On gen6, you can only do separate stencil with HIZ. */
 600        if (brw->gen == 6)
 601           brw->has_separate_stencil = false;
 602    }
 603
 604    if (driQueryOptionb(&brw->optionCache, "always_flush_batch")) {
 605       fprintf(stderr, "flushing batchbuffer before/after each draw call\n");
 606       brw->always_flush_batch = 1;
 607    }
 608
 609    if (driQueryOptionb(&brw->optionCache, "always_flush_cache")) {
 610       fprintf(stderr, "flushing GPU caches before/after each draw call\n");
 611       brw->always_flush_cache = 1;
 612    }
 613
 614    if (driQueryOptionb(&brw->optionCache, "disable_throttling")) {
 615       fprintf(stderr, "disabling flush throttling\n");
 616       brw->disable_throttling = 1;
 617    }
 618
 619    return true;
 620 }
 621
 622 void
 623 intelDestroyContext(__DRIcontext * driContextPriv)
 624 {
 625    struct brw_context *brw =
 626       (struct brw_context *) driContextPriv->driverPrivate;
 627    struct gl_context *ctx = &brw->ctx;
 628
 629    assert(brw); /* should never be null */
 630    if (brw) {
 631       /* Dump a final BMP in case the application doesn't call SwapBuffers */
 632       if (INTEL_DEBUG & DEBUG_AUB) {
 633          intel_batchbuffer_flush(brw);
 634          aub_dump_bmp(&brw->ctx);
 635       }
 636
 637       _mesa_meta_free(&brw->ctx);
 638
 639       brw->vtbl.destroy(brw);
 640
 641       if (ctx->swrast_context) {
 642          _swsetup_DestroyContext(&brw->ctx);
 643          _tnl_DestroyContext(&brw->ctx);
 644       }
 645       _vbo_DestroyContext(&brw->ctx);
 646
 647       if (ctx->swrast_context)
 648          _swrast_DestroyContext(&brw->ctx);
 649
 650       intel_batchbuffer_free(brw);
 651
 652       drm_intel_bo_unreference(brw->first_post_swapbuffers_batch);
 653       brw->first_post_swapbuffers_batch = NULL;
 654
 655       driDestroyOptionCache(&brw->optionCache);
 656
 657       /* free the Mesa context */
 658       _mesa_free_context_data(&brw->ctx);
 659
 660       ralloc_free(brw);
 661       driContextPriv->driverPrivate = NULL;
 662    }
 663 }
 664
 665 GLboolean
 666 intelUnbindContext(__DRIcontext * driContextPriv)
 667 {
 668    /* Unset current context and dispath table */
 669    _mesa_make_current(NULL, NULL, NULL);
 670
 671    return true;
 672 }
 673
 674 /**
 675  * Fixes up the context for GLES23 with our default-to-sRGB-capable behavior
 676  * on window system framebuffers.
 677  *
 678  * Desktop GL is fairly reasonable in its handling of sRGB: You can ask if
 679  * your renderbuffer can do sRGB encode, and you can flip a switch that does
 680  * sRGB encode if the renderbuffer can handle it.  You can ask specifically
 681  * for a visual where you're guaranteed to be capable, but it turns out that
 682  * everyone just makes all their ARGB8888 visuals capable and doesn't offer
 683  * incapable ones, becuase there's no difference between the two in resources
 684  * used.  Applications thus get built that accidentally rely on the default
 685  * visual choice being sRGB, so we make ours sRGB capable.  Everything sounds
 686  * great...
 687  *
 688  * But for GLES2/3, they decided that it was silly to not turn on sRGB encode
 689  * for sRGB renderbuffers you made with the GL_EXT_texture_sRGB equivalent.
 690  * So they removed the enable knob and made it "if the renderbuffer is sRGB
 691  * capable, do sRGB encode".  Then, for your window system renderbuffers, you
 692  * can ask for sRGB visuals and get sRGB encode, or not ask for sRGB visuals
 693  * and get no sRGB encode (assuming that both kinds of visual are available).
 694  * Thus our choice to support sRGB by default on our visuals for desktop would
 695  * result in broken rendering of GLES apps that aren't expecting sRGB encode.
 696  *
 697  * Unfortunately, renderbuffer setup happens before a context is created.  So
 698  * in intel_screen.c we always set up sRGB, and here, if you're a GLES2/3
 699  * context (without an sRGB visual, though we don't have sRGB visuals exposed
 700  * yet), we go turn that back off before anyone finds out.
 701  */
 702 static void
 703 intel_gles3_srgb_workaround(struct brw_context *brw,
 704                             struct gl_framebuffer *fb)
 705 {
 706    struct gl_context *ctx = &brw->ctx;
 707
 708    if (_mesa_is_desktop_gl(ctx) || !fb->Visual.sRGBCapable)
 709       return;
 710
 711    /* Some day when we support the sRGB capable bit on visuals available for
 712     * GLES, we'll need to respect that and not disable things here.
 713     */
 714    fb->Visual.sRGBCapable = false;
 715    for (int i = 0; i < BUFFER_COUNT; i++) {
 716       if (fb->Attachment[i].Renderbuffer &&
 717           fb->Attachment[i].Renderbuffer->Format == MESA_FORMAT_SARGB8) {
 718          fb->Attachment[i].Renderbuffer->Format = MESA_FORMAT_ARGB8888;
 719       }
 720    }
 721 }
 722
 723 GLboolean
 724 intelMakeCurrent(__DRIcontext * driContextPriv,
 725                  __DRIdrawable * driDrawPriv,
 726                  __DRIdrawable * driReadPriv)
 727 {
 728    struct brw_context *brw;
 729    GET_CURRENT_CONTEXT(curCtx);
 730
 731    if (driContextPriv)
 732       brw = (struct brw_context *) driContextPriv->driverPrivate;
 733    else
 734       brw = NULL;
 735
 736    /* According to the glXMakeCurrent() man page: "Pending commands to
 737     * the previous context, if any, are flushed before it is released."
 738     * But only flush if we're actually changing contexts.
 739     */
 740    if (brw_context(curCtx) && brw_context(curCtx) != brw) {
 741       _mesa_flush(curCtx);
 742    }
 743
 744    if (driContextPriv) {
 745       struct gl_context *ctx = &brw->ctx;
 746       struct gl_framebuffer *fb, *readFb;
 747
 748       if (driDrawPriv == NULL && driReadPriv == NULL) {
 749          fb = _mesa_get_incomplete_framebuffer();
 750          readFb = _mesa_get_incomplete_framebuffer();
 751       } else {
 752          fb = driDrawPriv->driverPrivate;
 753          readFb = driReadPriv->driverPrivate;
 754          driContextPriv->dri2.draw_stamp = driDrawPriv->dri2.stamp - 1;
 755          driContextPriv->dri2.read_stamp = driReadPriv->dri2.stamp - 1;
 756       }
 757
 758       /* The sRGB workaround changes the renderbuffer's format. We must change
 759        * the format before the renderbuffer's miptree get's allocated, otherwise
 760        * the formats of the renderbuffer and its miptree will differ.
 761        */
 762       intel_gles3_srgb_workaround(brw, fb);
 763       intel_gles3_srgb_workaround(brw, readFb);
 764
 765       intel_prepare_render(brw);
 766       _mesa_make_current(ctx, fb, readFb);
 767    }
 768    else {
 769       _mesa_make_current(NULL, NULL, NULL);
 770    }
 771
 772    return true;
 773 }
 774
 775 /**
 776  * \brief Query DRI2 to obtain a DRIdrawable's buffers.
 777  *
 778  * To determine which DRI buffers to request, examine the renderbuffers
 779  * attached to the drawable's framebuffer. Then request the buffers with
 780  * DRI2GetBuffers() or DRI2GetBuffersWithFormat().
 781  *
 782  * This is called from intel_update_renderbuffers().
 783  *
 784  * \param drawable      Drawable whose buffers are queried.
 785  * \param buffers       [out] List of buffers returned by DRI2 query.
 786  * \param buffer_count  [out] Number of buffers returned.
 787  *
 788  * \see intel_update_renderbuffers()
 789  * \see DRI2GetBuffers()
 790  * \see DRI2GetBuffersWithFormat()
 791  */
 792 static void
 793 intel_query_dri2_buffers(struct brw_context *brw,
 794                          __DRIdrawable *drawable,
 795                          __DRIbuffer **buffers,
 796                          int *buffer_count)
 797 {
 798    __DRIscreen *screen = brw->intelScreen->driScrnPriv;
 799    struct gl_framebuffer *fb = drawable->driverPrivate;
 800    int i = 0;
 801    unsigned attachments[8];
 802
 803    struct intel_renderbuffer *front_rb;
 804    struct intel_renderbuffer *back_rb;
 805
 806    front_rb = intel_get_renderbuffer(fb, BUFFER_FRONT_LEFT);
 807    back_rb = intel_get_renderbuffer(fb, BUFFER_BACK_LEFT);
 808
 809    memset(attachments, 0, sizeof(attachments));
 810    if ((brw->is_front_buffer_rendering ||
 811         brw->is_front_buffer_reading ||
 812         !back_rb) && front_rb) {
 813       /* If a fake front buffer is in use, then querying for
 814        * __DRI_BUFFER_FRONT_LEFT will cause the server to copy the image from
 815        * the real front buffer to the fake front buffer.  So before doing the
 816        * query, we need to make sure all the pending drawing has landed in the
 817        * real front buffer.
 818        */
 819       intel_flush(&brw->ctx);
 820       intel_flush_front(&brw->ctx);
 821
 822       attachments[i++] = __DRI_BUFFER_FRONT_LEFT;
 823       attachments[i++] = intel_bits_per_pixel(front_rb);
 824    } else if (front_rb && brw->front_buffer_dirty) {
 825       /* We have pending front buffer rendering, but we aren't querying for a
 826        * front buffer.  If the front buffer we have is a fake front buffer,
 827        * the X server is going to throw it away when it processes the query.
 828        * So before doing the query, make sure all the pending drawing has
 829        * landed in the real front buffer.
 830        */
 831       intel_flush(&brw->ctx);
 832       intel_flush_front(&brw->ctx);
 833    }
 834
 835    if (back_rb) {
 836       attachments[i++] = __DRI_BUFFER_BACK_LEFT;
 837       attachments[i++] = intel_bits_per_pixel(back_rb);
 838    }
 839
 840    assert(i <= ARRAY_SIZE(attachments));
 841
 842    *buffers = screen->dri2.loader->getBuffersWithFormat(drawable,
 843                                                         &drawable->w,
 844                                                         &drawable->h,
 845                                                         attachments, i / 2,
 846                                                         buffer_count,
 847                                                         drawable->loaderPrivate);
 848 }
 849
 850 /**
 851  * \brief Assign a DRI buffer's DRM region to a renderbuffer.
 852  *
 853  * This is called from intel_update_renderbuffers().
 854  *
 855  * \par Note:
 856  *    DRI buffers whose attachment point is DRI2BufferStencil or
 857  *    DRI2BufferDepthStencil are handled as special cases.
 858  *
 859  * \param buffer_name is a human readable name, such as "dri2 front buffer",
 860  *        that is passed to intel_region_alloc_for_handle().
 861  *
 862  * \see intel_update_renderbuffers()
 863  * \see intel_region_alloc_for_handle()
 864  */
 865 static void
 866 intel_process_dri2_buffer(struct brw_context *brw,
 867                           __DRIdrawable *drawable,
 868                           __DRIbuffer *buffer,
 869                           struct intel_renderbuffer *rb,
 870                           const char *buffer_name)
 871 {
 872    struct intel_region *region = NULL;
 873
 874    if (!rb)
 875       return;
 876
 877    unsigned num_samples = rb->Base.Base.NumSamples;
 878
 879    /* We try to avoid closing and reopening the same BO name, because the first
 880     * use of a mapping of the buffer involves a bunch of page faulting which is
 881     * moderately expensive.
 882     */
 883    if (num_samples == 0) {
 884        if (rb->mt &&
 885            rb->mt->region &&
 886            rb->mt->region->name == buffer->name)
 887           return;
 888    } else {
 889        if (rb->mt &&
 890            rb->mt->singlesample_mt &&
 891            rb->mt->singlesample_mt->region &&
 892            rb->mt->singlesample_mt->region->name == buffer->name)
 893           return;
 894    }
 895
 896    if (unlikely(INTEL_DEBUG & DEBUG_DRI)) {
 897       fprintf(stderr,
 898               "attaching buffer %d, at %d, cpp %d, pitch %d\n",
 899               buffer->name, buffer->attachment,
 900               buffer->cpp, buffer->pitch);
 901    }
 902
 903    intel_miptree_release(&rb->mt);
 904    region = intel_region_alloc_for_handle(brw->intelScreen,
 905                                           buffer->cpp,
 906                                           drawable->w,
 907                                           drawable->h,
 908                                           buffer->pitch,
 909                                           buffer->name,
 910                                           buffer_name);
 911    if (!region)
 912       return;
 913
 914    rb->mt = intel_miptree_create_for_dri2_buffer(brw,
 915                                                  buffer->attachment,
 916                                                  intel_rb_format(rb),
 917                                                  num_samples,
 918                                                  region);
 919    intel_region_release(&region);
 920 }