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

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