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