src/mesa/drivers/dri/i915/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/points.h"
  36 #include "main/renderbuffer.h"
  37
  38 #include "swrast/swrast.h"
  39 #include "swrast_setup/swrast_setup.h"
  40 #include "tnl/tnl.h"
  41 #include "drivers/common/driverfuncs.h"
  42 #include "drivers/common/meta.h"
  43
  44 #include "intel_chipset.h"
  45 #include "intel_buffers.h"
  46 #include "intel_tex.h"
  47 #include "intel_batchbuffer.h"
  48 #include "intel_clear.h"
  49 #include "intel_extensions.h"
  50 #include "intel_pixel.h"
  51 #include "intel_regions.h"
  52 #include "intel_buffer_objects.h"
  53 #include "intel_fbo.h"
  54 #include "intel_bufmgr.h"
  55 #include "intel_screen.h"
  56 #include "intel_mipmap_tree.h"
  57
  58 #include "utils.h"
  59 #include "../glsl/ralloc.h"
  60
  61 #ifndef INTEL_DEBUG
  62 int INTEL_DEBUG = (0);
  63 #endif
  64
  65
  66 static const GLubyte *
  67 intelGetString(struct gl_context * ctx, GLenum name)
  68 {
  69    const struct intel_context *const intel = intel_context(ctx);
  70    const char *chipset;
  71    static char buffer[128];
  72
  73    switch (name) {
  74    case GL_VENDOR:
  75       return (GLubyte *) "Intel Open Source Technology Center";
  76       break;
  77
  78    case GL_RENDERER:
  79       switch (intel->intelScreen->deviceID) {
  80 #undef CHIPSET
  81 #define CHIPSET(id, symbol, str) case id: chipset = str; break;
  82 #include "pci_ids/i915_pci_ids.h"
  83 #include "pci_ids/i965_pci_ids.h"
  84       default:
  85          chipset = "Unknown Intel Chipset";
  86          break;
  87       }
  88
  89       (void) driGetRendererString(buffer, chipset, 0);
  90       return (GLubyte *) buffer;
  91
  92    default:
  93       return NULL;
  94    }
  95 }
  96
  97 static void
  98 intel_flush_front(struct gl_context *ctx)
  99 {
 100    struct intel_context *intel = intel_context(ctx);
 101     __DRIcontext *driContext = intel->driContext;
 102     __DRIdrawable *driDrawable = driContext->driDrawablePriv;
 103     __DRIscreen *const screen = intel->intelScreen->driScrnPriv;
 104
 105     if (intel->front_buffer_dirty && _mesa_is_winsys_fbo(ctx->DrawBuffer)) {
 106       if (screen->dri2.loader->flushFrontBuffer != NULL &&
 107           driDrawable &&
 108           driDrawable->loaderPrivate) {
 109          screen->dri2.loader->flushFrontBuffer(driDrawable,
 110                                                driDrawable->loaderPrivate);
 111
 112          /* We set the dirty bit in intel_prepare_render() if we're
 113           * front buffer rendering once we get there.
 114           */
 115          intel->front_buffer_dirty = false;
 116       }
 117    }
 118 }
 119
 120 static unsigned
 121 intel_bits_per_pixel(const struct intel_renderbuffer *rb)
 122 {
 123    return _mesa_get_format_bytes(intel_rb_format(rb)) * 8;
 124 }
 125
 126 static void
 127 intel_query_dri2_buffers(struct intel_context *intel,
 128                          __DRIdrawable *drawable,
 129                          __DRIbuffer **buffers,
 130                          int *count);
 131
 132 static void
 133 intel_process_dri2_buffer(struct intel_context *intel,
 134                           __DRIdrawable *drawable,
 135                           __DRIbuffer *buffer,
 136                           struct intel_renderbuffer *rb,
 137                           const char *buffer_name);
 138
 139 void
 140 intel_update_renderbuffers(__DRIcontext *context, __DRIdrawable *drawable)
 141 {
 142    struct gl_framebuffer *fb = drawable->driverPrivate;
 143    struct intel_renderbuffer *rb;
 144    struct intel_context *intel = context->driverPrivate;
 145    __DRIbuffer *buffers = NULL;
 146    int i, count;
 147    const char *region_name;
 148
 149    /* Set this up front, so that in case our buffers get invalidated
 150     * while we're getting new buffers, we don't clobber the stamp and
 151     * thus ignore the invalidate. */
 152    drawable->lastStamp = drawable->dri2.stamp;
 153
 154    if (unlikely(INTEL_DEBUG & DEBUG_DRI))
 155       fprintf(stderr, "enter %s, drawable %p\n", __func__, drawable);
 156
 157    intel_query_dri2_buffers(intel, drawable, &buffers, &count);
 158
 159    if (buffers == NULL)
 160       return;
 161
 162    for (i = 0; i < count; i++) {
 163        switch (buffers[i].attachment) {
 164        case __DRI_BUFFER_FRONT_LEFT:
 165            rb = intel_get_renderbuffer(fb, BUFFER_FRONT_LEFT);
 166            region_name = "dri2 front buffer";
 167            break;
 168
 169        case __DRI_BUFFER_FAKE_FRONT_LEFT:
 170            rb = intel_get_renderbuffer(fb, BUFFER_FRONT_LEFT);
 171            region_name = "dri2 fake front buffer";
 172            break;
 173
 174        case __DRI_BUFFER_BACK_LEFT:
 175            rb = intel_get_renderbuffer(fb, BUFFER_BACK_LEFT);
 176            region_name = "dri2 back buffer";
 177            break;
 178
 179        case __DRI_BUFFER_DEPTH:
 180        case __DRI_BUFFER_HIZ:
 181        case __DRI_BUFFER_DEPTH_STENCIL:
 182        case __DRI_BUFFER_STENCIL:
 183        case __DRI_BUFFER_ACCUM:
 184        default:
 185            fprintf(stderr,
 186                    "unhandled buffer attach event, attachment type %d\n",
 187                    buffers[i].attachment);
 188            return;
 189        }
 190
 191        intel_process_dri2_buffer(intel, drawable, &buffers[i], rb, region_name);
 192    }
 193
 194    driUpdateFramebufferSize(&intel->ctx, drawable);
 195 }
 196
 197 /**
 198  * intel_prepare_render should be called anywhere that curent read/drawbuffer
 199  * state is required.
 200  */
 201 void
 202 intel_prepare_render(struct intel_context *intel)
 203 {
 204    __DRIcontext *driContext = intel->driContext;
 205    __DRIdrawable *drawable;
 206
 207    drawable = driContext->driDrawablePriv;
 208    if (drawable && drawable->dri2.stamp != driContext->dri2.draw_stamp) {
 209       if (drawable->lastStamp != drawable->dri2.stamp)
 210          intel_update_renderbuffers(driContext, drawable);
 211       intel_draw_buffer(&intel->ctx);
 212       driContext->dri2.draw_stamp = drawable->dri2.stamp;
 213    }
 214
 215    drawable = driContext->driReadablePriv;
 216    if (drawable && drawable->dri2.stamp != driContext->dri2.read_stamp) {
 217       if (drawable->lastStamp != drawable->dri2.stamp)
 218          intel_update_renderbuffers(driContext, drawable);
 219       driContext->dri2.read_stamp = drawable->dri2.stamp;
 220    }
 221
 222    /* If we're currently rendering to the front buffer, the rendering
 223     * that will happen next will probably dirty the front buffer.  So
 224     * mark it as dirty here.
 225     */
 226    if (intel->is_front_buffer_rendering)
 227       intel->front_buffer_dirty = true;
 228
 229    /* Wait for the swapbuffers before the one we just emitted, so we
 230     * don't get too many swaps outstanding for apps that are GPU-heavy
 231     * but not CPU-heavy.
 232     *
 233     * We're using intelDRI2Flush (called from the loader before
 234     * swapbuffer) and glFlush (for front buffer rendering) as the
 235     * indicator that a frame is done and then throttle when we get
 236     * here as we prepare to render the next frame.  At this point for
 237     * round trips for swap/copy and getting new buffers are done and
 238     * we'll spend less time waiting on the GPU.
 239     *
 240     * Unfortunately, we don't have a handle to the batch containing
 241     * the swap, and getting our hands on that doesn't seem worth it,
 242     * so we just us the first batch we emitted after the last swap.
 243     */
 244    if (intel->need_throttle && intel->first_post_swapbuffers_batch) {
 245       if (!intel->disable_throttling)
 246          drm_intel_bo_wait_rendering(intel->first_post_swapbuffers_batch);
 247       drm_intel_bo_unreference(intel->first_post_swapbuffers_batch);
 248       intel->first_post_swapbuffers_batch = NULL;
 249       intel->need_throttle = false;
 250    }
 251 }
 252
 253 static void
 254 intel_viewport(struct gl_context *ctx, GLint x, GLint y, GLsizei w, GLsizei h)
 255 {
 256     struct intel_context *intel = intel_context(ctx);
 257     __DRIcontext *driContext = intel->driContext;
 258
 259     if (intel->saved_viewport)
 260         intel->saved_viewport(ctx, x, y, w, h);
 261
 262     if (_mesa_is_winsys_fbo(ctx->DrawBuffer)) {
 263        dri2InvalidateDrawable(driContext->driDrawablePriv);
 264        dri2InvalidateDrawable(driContext->driReadablePriv);
 265     }
 266 }
 267
 268 static const struct dri_debug_control debug_control[] = {
 269    { "tex",   DEBUG_TEXTURE},
 270    { "state", DEBUG_STATE},
 271    { "ioctl", DEBUG_IOCTL},
 272    { "blit",  DEBUG_BLIT},
 273    { "mip",   DEBUG_MIPTREE},
 274    { "fall",  DEBUG_PERF},
 275    { "perf",  DEBUG_PERF},
 276    { "bat",   DEBUG_BATCH},
 277    { "pix",   DEBUG_PIXEL},
 278    { "buf",   DEBUG_BUFMGR},
 279    { "reg",   DEBUG_REGION},
 280    { "fbo",   DEBUG_FBO},
 281    { "fs",    DEBUG_WM },
 282    { "gs",    DEBUG_GS},
 283    { "sync",  DEBUG_SYNC},
 284    { "prim",  DEBUG_PRIMS },
 285    { "vert",  DEBUG_VERTS },
 286    { "dri",   DEBUG_DRI },
 287    { "sf",    DEBUG_SF },
 288    { "stats", DEBUG_STATS },
 289    { "wm",    DEBUG_WM },
 290    { "urb",   DEBUG_URB },
 291    { "vs",    DEBUG_VS },
 292    { "clip",  DEBUG_CLIP },
 293    { "aub",   DEBUG_AUB },
 294    { "no16",  DEBUG_NO16 },
 295    { "blorp", DEBUG_BLORP },
 296    { NULL,    0 }
 297 };
 298
 299
 300 static void
 301 intelInvalidateState(struct gl_context * ctx, GLuint new_state)
 302 {
 303     struct intel_context *intel = intel_context(ctx);
 304
 305     if (ctx->swrast_context)
 306        _swrast_InvalidateState(ctx, new_state);
 307    _vbo_InvalidateState(ctx, new_state);
 308
 309    intel->NewGLState |= new_state;
 310
 311    if (intel->vtbl.invalidate_state)
 312       intel->vtbl.invalidate_state( intel, new_state );
 313 }
 314
 315 void
 316 intel_flush_rendering_to_batch(struct gl_context *ctx)
 317 {
 318    struct intel_context *intel = intel_context(ctx);
 319
 320    if (intel->Fallback)
 321       _swrast_flush(ctx);
 322
 323    INTEL_FIREVERTICES(intel);
 324 }
 325
 326 void
 327 _intel_flush(struct gl_context *ctx, const char *file, int line)
 328 {
 329    struct intel_context *intel = intel_context(ctx);
 330
 331    intel_flush_rendering_to_batch(ctx);
 332
 333    if (intel->batch.used)
 334       _intel_batchbuffer_flush(intel, file, line);
 335 }
 336
 337 static void
 338 intel_glFlush(struct gl_context *ctx)
 339 {
 340    struct intel_context *intel = intel_context(ctx);
 341
 342    intel_flush(ctx);
 343    intel_flush_front(ctx);
 344    if (intel->is_front_buffer_rendering)
 345       intel->need_throttle = true;
 346 }
 347
 348 void
 349 intelFinish(struct gl_context * ctx)
 350 {
 351    struct intel_context *intel = intel_context(ctx);
 352
 353    intel_flush(ctx);
 354    intel_flush_front(ctx);
 355
 356    if (intel->batch.last_bo)
 357       drm_intel_bo_wait_rendering(intel->batch.last_bo);
 358 }
 359
 360 void
 361 intelInitDriverFunctions(struct dd_function_table *functions)
 362 {
 363    _mesa_init_driver_functions(functions);
 364
 365    functions->Flush = intel_glFlush;
 366    functions->Finish = intelFinish;
 367    functions->GetString = intelGetString;
 368    functions->UpdateState = intelInvalidateState;
 369
 370    intelInitTextureFuncs(functions);
 371    intelInitTextureImageFuncs(functions);
 372    intelInitTextureSubImageFuncs(functions);
 373    intelInitTextureCopyImageFuncs(functions);
 374    intelInitClearFuncs(functions);
 375    intelInitBufferFuncs(functions);
 376    intelInitPixelFuncs(functions);
 377    intelInitBufferObjectFuncs(functions);
 378    intel_init_syncobj_functions(functions);
 379 }
 380
 381 static bool
 382 validate_context_version(struct intel_screen *screen,
 383                          int mesa_api,
 384                          unsigned major_version,
 385                          unsigned minor_version,
 386                          unsigned *dri_ctx_error)
 387 {
 388    unsigned req_version = 10 * major_version + minor_version;
 389    unsigned max_version = 0;
 390
 391    switch (mesa_api) {
 392    case API_OPENGL_COMPAT:
 393       max_version = screen->max_gl_compat_version;
 394       break;
 395    case API_OPENGL_CORE:
 396       max_version = screen->max_gl_core_version;
 397       break;
 398    case API_OPENGLES:
 399       max_version = screen->max_gl_es1_version;
 400       break;
 401    case API_OPENGLES2:
 402       max_version = screen->max_gl_es2_version;
 403       break;
 404    default:
 405       max_version = 0;
 406       break;
 407    }
 408
 409    if (max_version == 0) {
 410       *dri_ctx_error = __DRI_CTX_ERROR_BAD_API;
 411       return false;
 412    } else if (req_version > max_version) {
 413       *dri_ctx_error = __DRI_CTX_ERROR_BAD_VERSION;
 414       return false;
 415    }
 416
 417    return true;
 418 }
 419
 420 bool
 421 intelInitContext(struct intel_context *intel,
 422                  int api,
 423                  unsigned major_version,
 424                  unsigned minor_version,
 425                  const struct gl_config * mesaVis,
 426                  __DRIcontext * driContextPriv,
 427                  void *sharedContextPrivate,
 428                  struct dd_function_table *functions,
 429                  unsigned *dri_ctx_error)
 430 {
 431    struct gl_context *ctx = &intel->ctx;
 432    struct gl_context *shareCtx = (struct gl_context *) sharedContextPrivate;
 433    __DRIscreen *sPriv = driContextPriv->driScreenPriv;
 434    struct intel_screen *intelScreen = sPriv->driverPrivate;
 435    int bo_reuse_mode;
 436    struct gl_config visual;
 437
 438    /* we can't do anything without a connection to the device */
 439    if (intelScreen->bufmgr == NULL) {
 440       *dri_ctx_error = __DRI_CTX_ERROR_NO_MEMORY;
 441       return false;
 442    }
 443
 444    if (!validate_context_version(intelScreen,
 445                                  api, major_version, minor_version,
 446                                  dri_ctx_error))
 447       return false;
 448
 449    /* Can't rely on invalidate events, fall back to glViewport hack */
 450    if (!driContextPriv->driScreenPriv->dri2.useInvalidate) {
 451       intel->saved_viewport = functions->Viewport;
 452       functions->Viewport = intel_viewport;
 453    }
 454
 455    if (mesaVis == NULL) {
 456       memset(&visual, 0, sizeof visual);
 457       mesaVis = &visual;
 458    }
 459
 460    intel->intelScreen = intelScreen;
 461
 462    if (!_mesa_initialize_context(&intel->ctx, api, mesaVis, shareCtx,
 463                                  functions)) {
 464       *dri_ctx_error = __DRI_CTX_ERROR_NO_MEMORY;
 465       printf("%s: failed to init mesa context\n", __FUNCTION__);
 466       return false;
 467    }
 468
 469    driContextPriv->driverPrivate = intel;
 470    intel->driContext = driContextPriv;
 471    intel->driFd = sPriv->fd;
 472
 473    intel->gen = intelScreen->gen;
 474
 475    const int devID = intelScreen->deviceID;
 476
 477    intel->is_945 = IS_945(devID);
 478
 479    intel->has_swizzling = intel->intelScreen->hw_has_swizzling;
 480
 481    memset(&ctx->TextureFormatSupported,
 482           0, sizeof(ctx->TextureFormatSupported));
 483
 484    driParseConfigFiles(&intel->optionCache, &intelScreen->optionCache,
 485                        sPriv->myNum, "i915");
 486    intel->maxBatchSize = 4096;
 487
 488    /* Estimate the size of the mappable aperture into the GTT.  There's an
 489     * ioctl to get the whole GTT size, but not one to get the mappable subset.
 490     * It turns out it's basically always 256MB, though some ancient hardware
 491     * was smaller.
 492     */
 493    uint32_t gtt_size = 256 * 1024 * 1024;
 494    if (intel->gen == 2)
 495       gtt_size = 128 * 1024 * 1024;
 496
 497    /* We don't want to map two objects such that a memcpy between them would
 498     * just fault one mapping in and then the other over and over forever.  So
 499     * we would need to divide the GTT size by 2.  Additionally, some GTT is
 500     * taken up by things like the framebuffer and the ringbuffer and such, so
 501     * be more conservative.
 502     */
 503    intel->max_gtt_map_object_size = gtt_size / 4;
 504
 505    intel->bufmgr = intelScreen->bufmgr;
 506
 507    bo_reuse_mode = driQueryOptioni(&intel->optionCache, "bo_reuse");
 508    switch (bo_reuse_mode) {
 509    case DRI_CONF_BO_REUSE_DISABLED:
 510       break;
 511    case DRI_CONF_BO_REUSE_ALL:
 512       intel_bufmgr_gem_enable_reuse(intel->bufmgr);
 513       break;
 514    }
 515
 516    ctx->Const.MinLineWidth = 1.0;
 517    ctx->Const.MinLineWidthAA = 1.0;
 518    ctx->Const.MaxLineWidth = 5.0;
 519    ctx->Const.MaxLineWidthAA = 5.0;
 520    ctx->Const.LineWidthGranularity = 0.5;
 521
 522    ctx->Const.MinPointSize = 1.0;
 523    ctx->Const.MinPointSizeAA = 1.0;
 524    ctx->Const.MaxPointSize = 255.0;
 525    ctx->Const.MaxPointSizeAA = 3.0;
 526    ctx->Const.PointSizeGranularity = 1.0;
 527
 528    ctx->Const.StripTextureBorder = GL_TRUE;
 529
 530    /* reinitialize the context point state.
 531     * It depend on constants in __struct gl_contextRec::Const
 532     */
 533    _mesa_init_point(ctx);
 534
 535    ctx->Const.MaxRenderbufferSize = 2048;
 536
 537    _swrast_CreateContext(ctx);
 538    _vbo_CreateContext(ctx);
 539    if (ctx->swrast_context) {
 540       _tnl_CreateContext(ctx);
 541       _swsetup_CreateContext(ctx);
 542
 543       /* Configure swrast to match hardware characteristics: */
 544       _swrast_allow_pixel_fog(ctx, false);
 545       _swrast_allow_vertex_fog(ctx, true);
 546    }
 547
 548    _mesa_meta_init(ctx);
 549
 550    intel->hw_stencil = mesaVis->stencilBits && mesaVis->depthBits == 24;
 551    intel->hw_stipple = 1;
 552
 553    intel->RenderIndex = ~0;
 554
 555    intelInitExtensions(ctx);
 556
 557    INTEL_DEBUG = driParseDebugString(getenv("INTEL_DEBUG"), debug_control);
 558    if (INTEL_DEBUG & DEBUG_BUFMGR)
 559       dri_bufmgr_set_debug(intel->bufmgr, true);
 560    if (INTEL_DEBUG & DEBUG_PERF)
 561       intel->perf_debug = true;
 562
 563    if (INTEL_DEBUG & DEBUG_AUB)
 564       drm_intel_bufmgr_gem_set_aub_dump(intel->bufmgr, true);
 565
 566    intel_batchbuffer_init(intel);
 567
 568    intel_fbo_init(intel);
 569
 570    intel->use_early_z = driQueryOptionb(&intel->optionCache, "early_z");
 571
 572    intel->prim.primitive = ~0;
 573
 574    /* Force all software fallbacks */
 575    if (driQueryOptionb(&intel->optionCache, "no_rast")) {
 576       fprintf(stderr, "disabling 3D rasterization\n");
 577       intel->no_rast = 1;
 578    }
 579
 580    if (driQueryOptionb(&intel->optionCache, "always_flush_batch")) {
 581       fprintf(stderr, "flushing batchbuffer before/after each draw call\n");
 582       intel->always_flush_batch = 1;
 583    }
 584
 585    if (driQueryOptionb(&intel->optionCache, "always_flush_cache")) {
 586       fprintf(stderr, "flushing GPU caches before/after each draw call\n");
 587       intel->always_flush_cache = 1;
 588    }
 589
 590    if (driQueryOptionb(&intel->optionCache, "disable_throttling")) {
 591       fprintf(stderr, "disabling flush throttling\n");
 592       intel->disable_throttling = 1;
 593    }
 594
 595    return true;
 596 }
 597
 598 void
 599 intelDestroyContext(__DRIcontext * driContextPriv)
 600 {
 601    struct intel_context *intel =
 602       (struct intel_context *) driContextPriv->driverPrivate;
 603    struct gl_context *ctx = &intel->ctx;
 604
 605    assert(intel);               /* should never be null */
 606    if (intel) {
 607       INTEL_FIREVERTICES(intel);
 608
 609       /* Dump a final BMP in case the application doesn't call SwapBuffers */
 610       if (INTEL_DEBUG & DEBUG_AUB) {
 611          intel_batchbuffer_flush(intel);
 612          aub_dump_bmp(&intel->ctx);
 613       }
 614
 615       _mesa_meta_free(&intel->ctx);
 616
 617       intel->vtbl.destroy(intel);
 618
 619       if (ctx->swrast_context) {
 620          _swsetup_DestroyContext(&intel->ctx);
 621          _tnl_DestroyContext(&intel->ctx);
 622       }
 623       _vbo_DestroyContext(&intel->ctx);
 624
 625       if (ctx->swrast_context)
 626          _swrast_DestroyContext(&intel->ctx);
 627       intel->Fallback = 0x0;      /* don't call _swrast_Flush later */
 628
 629       intel_batchbuffer_free(intel);
 630
 631       free(intel->prim.vb);
 632       intel->prim.vb = NULL;
 633       drm_intel_bo_unreference(intel->prim.vb_bo);
 634       intel->prim.vb_bo = NULL;
 635       drm_intel_bo_unreference(intel->first_post_swapbuffers_batch);
 636       intel->first_post_swapbuffers_batch = NULL;
 637
 638       driDestroyOptionCache(&intel->optionCache);
 639
 640       /* free the Mesa context */
 641       _mesa_free_context_data(&intel->ctx);
 642
 643       _math_matrix_dtr(&intel->ViewportMatrix);
 644
 645       ralloc_free(intel);
 646       driContextPriv->driverPrivate = NULL;
 647    }
 648 }
 649
 650 GLboolean
 651 intelUnbindContext(__DRIcontext * driContextPriv)
 652 {
 653    /* Unset current context and dispath table */
 654    _mesa_make_current(NULL, NULL, NULL);
 655
 656    return true;
 657 }
 658
 659 /**
 660  * Fixes up the context for GLES23 with our default-to-sRGB-capable behavior
 661  * on window system framebuffers.
 662  *
 663  * Desktop GL is fairly reasonable in its handling of sRGB: You can ask if
 664  * your renderbuffer can do sRGB encode, and you can flip a switch that does
 665  * sRGB encode if the renderbuffer can handle it.  You can ask specifically
 666  * for a visual where you're guaranteed to be capable, but it turns out that
 667  * everyone just makes all their ARGB8888 visuals capable and doesn't offer
 668  * incapable ones, becuase there's no difference between the two in resources
 669  * used.  Applications thus get built that accidentally rely on the default
 670  * visual choice being sRGB, so we make ours sRGB capable.  Everything sounds
 671  * great...
 672  *
 673  * But for GLES2/3, they decided that it was silly to not turn on sRGB encode
 674  * for sRGB renderbuffers you made with the GL_EXT_texture_sRGB equivalent.
 675  * So they removed the enable knob and made it "if the renderbuffer is sRGB
 676  * capable, do sRGB encode".  Then, for your window system renderbuffers, you
 677  * can ask for sRGB visuals and get sRGB encode, or not ask for sRGB visuals
 678  * and get no sRGB encode (assuming that both kinds of visual are available).
 679  * Thus our choice to support sRGB by default on our visuals for desktop would
 680  * result in broken rendering of GLES apps that aren't expecting sRGB encode.
 681  *
 682  * Unfortunately, renderbuffer setup happens before a context is created.  So
 683  * in intel_screen.c we always set up sRGB, and here, if you're a GLES2/3
 684  * context (without an sRGB visual, though we don't have sRGB visuals exposed
 685  * yet), we go turn that back off before anyone finds out.
 686  */
 687 static void
 688 intel_gles3_srgb_workaround(struct intel_context *intel,
 689                             struct gl_framebuffer *fb)
 690 {
 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 intel_context *intel;
 714    GET_CURRENT_CONTEXT(curCtx);
 715
 716    if (driContextPriv)
 717       intel = (struct intel_context *) driContextPriv->driverPrivate;
 718    else
 719       intel = 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 (intel_context(curCtx) && intel_context(curCtx) != intel) {
 726       _mesa_flush(curCtx);
 727    }
 728
 729    if (driContextPriv) {
 730       struct gl_context *ctx = &intel->ctx;
 731       struct gl_framebuffer *fb, *readFb;
 732
 733       if (driDrawPriv == NULL && driReadPriv == NULL) {
 734          fb = _mesa_get_incomplete_framebuffer();
 735          readFb = _mesa_get_incomplete_framebuffer();
 736       } else {
 737          fb = driDrawPriv->driverPrivate;
 738          readFb = driReadPriv->driverPrivate;
 739          driContextPriv->dri2.draw_stamp = driDrawPriv->dri2.stamp - 1;
 740          driContextPriv->dri2.read_stamp = driReadPriv->dri2.stamp - 1;
 741       }
 742
 743       intel_prepare_render(intel);
 744       _mesa_make_current(ctx, fb, readFb);
 745
 746       intel_gles3_srgb_workaround(intel, ctx->WinSysDrawBuffer);
 747       intel_gles3_srgb_workaround(intel, ctx->WinSysReadBuffer);
 748
 749       /* We do this in intel_prepare_render() too, but intel->ctx.DrawBuffer
 750        * is NULL at that point.  We can't call _mesa_makecurrent()
 751        * first, since we need the buffer size for the initial
 752        * viewport.  So just call intel_draw_buffer() again here. */
 753       intel_draw_buffer(ctx);
 754    }
 755    else {
 756       _mesa_make_current(NULL, NULL, NULL);
 757    }
 758
 759    return true;
 760 }
 761
 762 /**
 763  * \brief Query DRI2 to obtain a DRIdrawable's buffers.
 764  *
 765  * To determine which DRI buffers to request, examine the renderbuffers
 766  * attached to the drawable's framebuffer. Then request the buffers with
 767  * DRI2GetBuffers() or DRI2GetBuffersWithFormat().
 768  *
 769  * This is called from intel_update_renderbuffers().
 770  *
 771  * \param drawable      Drawable whose buffers are queried.
 772  * \param buffers       [out] List of buffers returned by DRI2 query.
 773  * \param buffer_count  [out] Number of buffers returned.
 774  *
 775  * \see intel_update_renderbuffers()
 776  * \see DRI2GetBuffers()
 777  * \see DRI2GetBuffersWithFormat()
 778  */
 779 static void
 780 intel_query_dri2_buffers(struct intel_context *intel,
 781                          __DRIdrawable *drawable,
 782                          __DRIbuffer **buffers,
 783                          int *buffer_count)
 784 {
 785    __DRIscreen *screen = intel->intelScreen->driScrnPriv;
 786    struct gl_framebuffer *fb = drawable->driverPrivate;
 787    int i = 0;
 788    unsigned attachments[8];
 789
 790    struct intel_renderbuffer *front_rb;
 791    struct intel_renderbuffer *back_rb;
 792
 793    front_rb = intel_get_renderbuffer(fb, BUFFER_FRONT_LEFT);
 794    back_rb = intel_get_renderbuffer(fb, BUFFER_BACK_LEFT);
 795
 796    memset(attachments, 0, sizeof(attachments));
 797    if ((intel->is_front_buffer_rendering ||
 798         intel->is_front_buffer_reading ||
 799         !back_rb) && front_rb) {
 800       /* If a fake front buffer is in use, then querying for
 801        * __DRI_BUFFER_FRONT_LEFT will cause the server to copy the image from
 802        * the real front buffer to the fake front buffer.  So before doing the
 803        * query, we need to make sure all the pending drawing has landed in the
 804        * real front buffer.
 805        */
 806       intel_flush(&intel->ctx);
 807       intel_flush_front(&intel->ctx);
 808
 809       attachments[i++] = __DRI_BUFFER_FRONT_LEFT;
 810       attachments[i++] = intel_bits_per_pixel(front_rb);
 811    } else if (front_rb && intel->front_buffer_dirty) {
 812       /* We have pending front buffer rendering, but we aren't querying for a
 813        * front buffer.  If the front buffer we have is a fake front buffer,
 814        * the X server is going to throw it away when it processes the query.
 815        * So before doing the query, make sure all the pending drawing has
 816        * landed in the real front buffer.
 817        */
 818       intel_flush(&intel->ctx);
 819       intel_flush_front(&intel->ctx);
 820    }
 821
 822    if (back_rb) {
 823       attachments[i++] = __DRI_BUFFER_BACK_LEFT;
 824       attachments[i++] = intel_bits_per_pixel(back_rb);
 825    }
 826
 827    assert(i <= ARRAY_SIZE(attachments));
 828
 829    *buffers = screen->dri2.loader->getBuffersWithFormat(drawable,
 830                                                         &drawable->w,
 831                                                         &drawable->h,
 832                                                         attachments, i / 2,
 833                                                         buffer_count,
 834                                                         drawable->loaderPrivate);
 835 }
 836
 837 /**
 838  * \brief Assign a DRI buffer's DRM region to a renderbuffer.
 839  *
 840  * This is called from intel_update_renderbuffers().
 841  *
 842  * \par Note:
 843  *    DRI buffers whose attachment point is DRI2BufferStencil or
 844  *    DRI2BufferDepthStencil are handled as special cases.
 845  *
 846  * \param buffer_name is a human readable name, such as "dri2 front buffer",
 847  *        that is passed to intel_region_alloc_for_handle().
 848  *
 849  * \see intel_update_renderbuffers()
 850  * \see intel_region_alloc_for_handle()
 851  */
 852 static void
 853 intel_process_dri2_buffer(struct intel_context *intel,
 854                           __DRIdrawable *drawable,
 855                           __DRIbuffer *buffer,
 856                           struct intel_renderbuffer *rb,
 857                           const char *buffer_name)
 858 {
 859    struct intel_region *region = NULL;
 860
 861    if (!rb)
 862       return;
 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 (rb->mt &&
 869        rb->mt->region &&
 870        rb->mt->region->name == buffer->name)
 871       return;
 872
 873    if (unlikely(INTEL_DEBUG & DEBUG_DRI)) {
 874       fprintf(stderr,
 875               "attaching buffer %d, at %d, cpp %d, pitch %d\n",
 876               buffer->name, buffer->attachment,
 877               buffer->cpp, buffer->pitch);
 878    }
 879
 880    intel_miptree_release(&rb->mt);
 881    region = intel_region_alloc_for_handle(intel->intelScreen,
 882                                           buffer->cpp,
 883                                           drawable->w,
 884                                           drawable->h,
 885                                           buffer->pitch,
 886                                           buffer->name,
 887                                           buffer_name);
 888    if (!region)
 889       return;
 890
 891    rb->mt = intel_miptree_create_for_dri2_buffer(intel,
 892                                                  buffer->attachment,
 893                                                  intel_rb_format(rb),
 894                                                  region);
 895    intel_region_release(&region);
 896 }