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       default:
  84          chipset = "Unknown Intel Chipset";
  85          break;
  86       }
  87
  88       (void) driGetRendererString(buffer, chipset, 0);
  89       return (GLubyte *) buffer;
  90
  91    default:
  92       return NULL;
  93    }
  94 }
  95
  96 static void
  97 intel_flush_front(struct gl_context *ctx)
  98 {
  99    struct intel_context *intel = intel_context(ctx);
 100     __DRIcontext *driContext = intel->driContext;
 101     __DRIdrawable *driDrawable = driContext->driDrawablePriv;
 102     __DRIscreen *const screen = intel->intelScreen->driScrnPriv;
 103
 104     if (intel->front_buffer_dirty && _mesa_is_winsys_fbo(ctx->DrawBuffer)) {
 105       if (screen->dri2.loader->flushFrontBuffer != NULL &&
 106           driDrawable &&
 107           driDrawable->loaderPrivate) {
 108          screen->dri2.loader->flushFrontBuffer(driDrawable,
 109                                                driDrawable->loaderPrivate);
 110
 111          /* We set the dirty bit in intel_prepare_render() if we're
 112           * front buffer rendering once we get there.
 113           */
 114          intel->front_buffer_dirty = false;
 115       }
 116    }
 117 }
 118
 119 static unsigned
 120 intel_bits_per_pixel(const struct intel_renderbuffer *rb)
 121 {
 122    return _mesa_get_format_bytes(intel_rb_format(rb)) * 8;
 123 }
 124
 125 static void
 126 intel_query_dri2_buffers(struct intel_context *intel,
 127                          __DRIdrawable *drawable,
 128                          __DRIbuffer **buffers,
 129                          int *count);
 130
 131 static void
 132 intel_process_dri2_buffer(struct intel_context *intel,
 133                           __DRIdrawable *drawable,
 134                           __DRIbuffer *buffer,
 135                           struct intel_renderbuffer *rb,
 136                           const char *buffer_name);
 137
 138 void
 139 intel_update_renderbuffers(__DRIcontext *context, __DRIdrawable *drawable)
 140 {
 141    struct gl_framebuffer *fb = drawable->driverPrivate;
 142    struct intel_renderbuffer *rb;
 143    struct intel_context *intel = context->driverPrivate;
 144    __DRIbuffer *buffers = NULL;
 145    int i, count;
 146    const char *region_name;
 147
 148    /* Set this up front, so that in case our buffers get invalidated
 149     * while we're getting new buffers, we don't clobber the stamp and
 150     * thus ignore the invalidate. */
 151    drawable->lastStamp = drawable->dri2.stamp;
 152
 153    if (unlikely(INTEL_DEBUG & DEBUG_DRI))
 154       fprintf(stderr, "enter %s, drawable %p\n", __func__, drawable);
 155
 156    intel_query_dri2_buffers(intel, drawable, &buffers, &count);
 157
 158    if (buffers == NULL)
 159       return;
 160
 161    for (i = 0; i < count; i++) {
 162        switch (buffers[i].attachment) {
 163        case __DRI_BUFFER_FRONT_LEFT:
 164            rb = intel_get_renderbuffer(fb, BUFFER_FRONT_LEFT);
 165            region_name = "dri2 front buffer";
 166            break;
 167
 168        case __DRI_BUFFER_FAKE_FRONT_LEFT:
 169            rb = intel_get_renderbuffer(fb, BUFFER_FRONT_LEFT);
 170            region_name = "dri2 fake front buffer";
 171            break;
 172
 173        case __DRI_BUFFER_BACK_LEFT:
 174            rb = intel_get_renderbuffer(fb, BUFFER_BACK_LEFT);
 175            region_name = "dri2 back buffer";
 176            break;
 177
 178        case __DRI_BUFFER_DEPTH:
 179        case __DRI_BUFFER_HIZ:
 180        case __DRI_BUFFER_DEPTH_STENCIL:
 181        case __DRI_BUFFER_STENCIL:
 182        case __DRI_BUFFER_ACCUM:
 183        default:
 184            fprintf(stderr,
 185                    "unhandled buffer attach event, attachment type %d\n",
 186                    buffers[i].attachment);
 187            return;
 188        }
 189
 190        intel_process_dri2_buffer(intel, drawable, &buffers[i], rb, region_name);
 191    }
 192
 193    driUpdateFramebufferSize(&intel->ctx, drawable);
 194 }
 195
 196 /**
 197  * intel_prepare_render should be called anywhere that curent read/drawbuffer
 198  * state is required.
 199  */
 200 void
 201 intel_prepare_render(struct intel_context *intel)
 202 {
 203    __DRIcontext *driContext = intel->driContext;
 204    __DRIdrawable *drawable;
 205
 206    drawable = driContext->driDrawablePriv;
 207    if (drawable && drawable->dri2.stamp != driContext->dri2.draw_stamp) {
 208       if (drawable->lastStamp != drawable->dri2.stamp)
 209          intel_update_renderbuffers(driContext, drawable);
 210       intel_draw_buffer(&intel->ctx);
 211       driContext->dri2.draw_stamp = drawable->dri2.stamp;
 212    }
 213
 214    drawable = driContext->driReadablePriv;
 215    if (drawable && drawable->dri2.stamp != driContext->dri2.read_stamp) {
 216       if (drawable->lastStamp != drawable->dri2.stamp)
 217          intel_update_renderbuffers(driContext, drawable);
 218       driContext->dri2.read_stamp = drawable->dri2.stamp;
 219    }
 220
 221    /* If we're currently rendering to the front buffer, the rendering
 222     * that will happen next will probably dirty the front buffer.  So
 223     * mark it as dirty here.
 224     */
 225    if (intel->is_front_buffer_rendering)
 226       intel->front_buffer_dirty = true;
 227
 228    /* Wait for the swapbuffers before the one we just emitted, so we
 229     * don't get too many swaps outstanding for apps that are GPU-heavy
 230     * but not CPU-heavy.
 231     *
 232     * We're using intelDRI2Flush (called from the loader before
 233     * swapbuffer) and glFlush (for front buffer rendering) as the
 234     * indicator that a frame is done and then throttle when we get
 235     * here as we prepare to render the next frame.  At this point for
 236     * round trips for swap/copy and getting new buffers are done and
 237     * we'll spend less time waiting on the GPU.
 238     *
 239     * Unfortunately, we don't have a handle to the batch containing
 240     * the swap, and getting our hands on that doesn't seem worth it,
 241     * so we just us the first batch we emitted after the last swap.
 242     */
 243    if (intel->need_throttle && intel->first_post_swapbuffers_batch) {
 244       if (!intel->disable_throttling)
 245          drm_intel_bo_wait_rendering(intel->first_post_swapbuffers_batch);
 246       drm_intel_bo_unreference(intel->first_post_swapbuffers_batch);
 247       intel->first_post_swapbuffers_batch = NULL;
 248       intel->need_throttle = false;
 249    }
 250 }
 251
 252 static void
 253 intel_viewport(struct gl_context *ctx, GLint x, GLint y, GLsizei w, GLsizei h)
 254 {
 255     struct intel_context *intel = intel_context(ctx);
 256     __DRIcontext *driContext = intel->driContext;
 257
 258     if (intel->saved_viewport)
 259         intel->saved_viewport(ctx, x, y, w, h);
 260
 261     if (_mesa_is_winsys_fbo(ctx->DrawBuffer)) {
 262        dri2InvalidateDrawable(driContext->driDrawablePriv);
 263        dri2InvalidateDrawable(driContext->driReadablePriv);
 264     }
 265 }
 266
 267 static const struct dri_debug_control debug_control[] = {
 268    { "tex",   DEBUG_TEXTURE},
 269    { "state", DEBUG_STATE},
 270    { "blit",  DEBUG_BLIT},
 271    { "mip",   DEBUG_MIPTREE},
 272    { "fall",  DEBUG_PERF},
 273    { "perf",  DEBUG_PERF},
 274    { "bat",   DEBUG_BATCH},
 275    { "pix",   DEBUG_PIXEL},
 276    { "buf",   DEBUG_BUFMGR},
 277    { "reg",   DEBUG_REGION},
 278    { "fbo",   DEBUG_FBO},
 279    { "fs",    DEBUG_WM },
 280    { "sync",  DEBUG_SYNC},
 281    { "dri",   DEBUG_DRI },
 282    { "stats", DEBUG_STATS },
 283    { "wm",    DEBUG_WM },
 284    { "aub",   DEBUG_AUB },
 285    { NULL,    0 }
 286 };
 287
 288
 289 static void
 290 intelInvalidateState(struct gl_context * ctx, GLuint new_state)
 291 {
 292     struct intel_context *intel = intel_context(ctx);
 293
 294     if (ctx->swrast_context)
 295        _swrast_InvalidateState(ctx, new_state);
 296    _vbo_InvalidateState(ctx, new_state);
 297
 298    intel->NewGLState |= new_state;
 299
 300    if (intel->vtbl.invalidate_state)
 301       intel->vtbl.invalidate_state( intel, new_state );
 302 }
 303
 304 void
 305 intel_flush_rendering_to_batch(struct gl_context *ctx)
 306 {
 307    struct intel_context *intel = intel_context(ctx);
 308
 309    if (intel->Fallback)
 310       _swrast_flush(ctx);
 311
 312    INTEL_FIREVERTICES(intel);
 313 }
 314
 315 void
 316 _intel_flush(struct gl_context *ctx, const char *file, int line)
 317 {
 318    struct intel_context *intel = intel_context(ctx);
 319
 320    intel_flush_rendering_to_batch(ctx);
 321
 322    if (intel->batch.used)
 323       _intel_batchbuffer_flush(intel, file, line);
 324 }
 325
 326 static void
 327 intel_glFlush(struct gl_context *ctx)
 328 {
 329    struct intel_context *intel = intel_context(ctx);
 330
 331    intel_flush(ctx);
 332    intel_flush_front(ctx);
 333    if (intel->is_front_buffer_rendering)
 334       intel->need_throttle = true;
 335 }
 336
 337 void
 338 intelFinish(struct gl_context * ctx)
 339 {
 340    struct intel_context *intel = intel_context(ctx);
 341
 342    intel_flush(ctx);
 343    intel_flush_front(ctx);
 344
 345    if (intel->batch.last_bo)
 346       drm_intel_bo_wait_rendering(intel->batch.last_bo);
 347 }
 348
 349 void
 350 intelInitDriverFunctions(struct dd_function_table *functions)
 351 {
 352    _mesa_init_driver_functions(functions);
 353
 354    functions->Flush = intel_glFlush;
 355    functions->Finish = intelFinish;
 356    functions->GetString = intelGetString;
 357    functions->UpdateState = intelInvalidateState;
 358
 359    intelInitTextureFuncs(functions);
 360    intelInitTextureImageFuncs(functions);
 361    intelInitTextureSubImageFuncs(functions);
 362    intelInitTextureCopyImageFuncs(functions);
 363    intelInitClearFuncs(functions);
 364    intelInitBufferFuncs(functions);
 365    intelInitPixelFuncs(functions);
 366    intelInitBufferObjectFuncs(functions);
 367    intel_init_syncobj_functions(functions);
 368 }
 369
 370 static bool
 371 validate_context_version(struct intel_screen *screen,
 372                          int mesa_api,
 373                          unsigned major_version,
 374                          unsigned minor_version,
 375                          unsigned *dri_ctx_error)
 376 {
 377    unsigned req_version = 10 * major_version + minor_version;
 378    unsigned max_version = 0;
 379
 380    switch (mesa_api) {
 381    case API_OPENGL_COMPAT:
 382       max_version = screen->max_gl_compat_version;
 383       break;
 384    case API_OPENGL_CORE:
 385       max_version = screen->max_gl_core_version;
 386       break;
 387    case API_OPENGLES:
 388       max_version = screen->max_gl_es1_version;
 389       break;
 390    case API_OPENGLES2:
 391       max_version = screen->max_gl_es2_version;
 392       break;
 393    default:
 394       max_version = 0;
 395       break;
 396    }
 397
 398    if (max_version == 0) {
 399       *dri_ctx_error = __DRI_CTX_ERROR_BAD_API;
 400       return false;
 401    } else if (req_version > max_version) {
 402       *dri_ctx_error = __DRI_CTX_ERROR_BAD_VERSION;
 403       return false;
 404    }
 405
 406    return true;
 407 }
 408
 409 bool
 410 intelInitContext(struct intel_context *intel,
 411                  int api,
 412                  unsigned major_version,
 413                  unsigned minor_version,
 414                  const struct gl_config * mesaVis,
 415                  __DRIcontext * driContextPriv,
 416                  void *sharedContextPrivate,
 417                  struct dd_function_table *functions,
 418                  unsigned *dri_ctx_error)
 419 {
 420    struct gl_context *ctx = &intel->ctx;
 421    struct gl_context *shareCtx = (struct gl_context *) sharedContextPrivate;
 422    __DRIscreen *sPriv = driContextPriv->driScreenPriv;
 423    struct intel_screen *intelScreen = sPriv->driverPrivate;
 424    int bo_reuse_mode;
 425    struct gl_config visual;
 426
 427    /* we can't do anything without a connection to the device */
 428    if (intelScreen->bufmgr == NULL) {
 429       *dri_ctx_error = __DRI_CTX_ERROR_NO_MEMORY;
 430       return false;
 431    }
 432
 433    if (!validate_context_version(intelScreen,
 434                                  api, major_version, minor_version,
 435                                  dri_ctx_error))
 436       return false;
 437
 438    /* Can't rely on invalidate events, fall back to glViewport hack */
 439    if (!driContextPriv->driScreenPriv->dri2.useInvalidate) {
 440       intel->saved_viewport = functions->Viewport;
 441       functions->Viewport = intel_viewport;
 442    }
 443
 444    if (mesaVis == NULL) {
 445       memset(&visual, 0, sizeof visual);
 446       mesaVis = &visual;
 447    }
 448
 449    intel->intelScreen = intelScreen;
 450
 451    if (!_mesa_initialize_context(&intel->ctx, api, mesaVis, shareCtx,
 452                                  functions)) {
 453       *dri_ctx_error = __DRI_CTX_ERROR_NO_MEMORY;
 454       printf("%s: failed to init mesa context\n", __FUNCTION__);
 455       return false;
 456    }
 457
 458    driContextPriv->driverPrivate = intel;
 459    intel->driContext = driContextPriv;
 460    intel->driFd = sPriv->fd;
 461
 462    intel->gen = intelScreen->gen;
 463
 464    const int devID = intelScreen->deviceID;
 465
 466    intel->is_945 = IS_945(devID);
 467
 468    intel->has_swizzling = intel->intelScreen->hw_has_swizzling;
 469
 470    memset(&ctx->TextureFormatSupported,
 471           0, sizeof(ctx->TextureFormatSupported));
 472
 473    driParseConfigFiles(&intel->optionCache, &intelScreen->optionCache,
 474                        sPriv->myNum, "i915");
 475    intel->maxBatchSize = 4096;
 476
 477    /* Estimate the size of the mappable aperture into the GTT.  There's an
 478     * ioctl to get the whole GTT size, but not one to get the mappable subset.
 479     * It turns out it's basically always 256MB, though some ancient hardware
 480     * was smaller.
 481     */
 482    uint32_t gtt_size = 256 * 1024 * 1024;
 483    if (intel->gen == 2)
 484       gtt_size = 128 * 1024 * 1024;
 485
 486    /* We don't want to map two objects such that a memcpy between them would
 487     * just fault one mapping in and then the other over and over forever.  So
 488     * we would need to divide the GTT size by 2.  Additionally, some GTT is
 489     * taken up by things like the framebuffer and the ringbuffer and such, so
 490     * be more conservative.
 491     */
 492    intel->max_gtt_map_object_size = gtt_size / 4;
 493
 494    intel->bufmgr = intelScreen->bufmgr;
 495
 496    bo_reuse_mode = driQueryOptioni(&intel->optionCache, "bo_reuse");
 497    switch (bo_reuse_mode) {
 498    case DRI_CONF_BO_REUSE_DISABLED:
 499       break;
 500    case DRI_CONF_BO_REUSE_ALL:
 501       intel_bufmgr_gem_enable_reuse(intel->bufmgr);
 502       break;
 503    }
 504
 505    ctx->Const.MinLineWidth = 1.0;
 506    ctx->Const.MinLineWidthAA = 1.0;
 507    ctx->Const.MaxLineWidth = 5.0;
 508    ctx->Const.MaxLineWidthAA = 5.0;
 509    ctx->Const.LineWidthGranularity = 0.5;
 510
 511    ctx->Const.MinPointSize = 1.0;
 512    ctx->Const.MinPointSizeAA = 1.0;
 513    ctx->Const.MaxPointSize = 255.0;
 514    ctx->Const.MaxPointSizeAA = 3.0;
 515    ctx->Const.PointSizeGranularity = 1.0;
 516
 517    ctx->Const.StripTextureBorder = GL_TRUE;
 518
 519    /* reinitialize the context point state.
 520     * It depend on constants in __struct gl_contextRec::Const
 521     */
 522    _mesa_init_point(ctx);
 523
 524    ctx->Const.MaxRenderbufferSize = 2048;
 525
 526    _swrast_CreateContext(ctx);
 527    _vbo_CreateContext(ctx);
 528    if (ctx->swrast_context) {
 529       _tnl_CreateContext(ctx);
 530       _swsetup_CreateContext(ctx);
 531
 532       /* Configure swrast to match hardware characteristics: */
 533       _swrast_allow_pixel_fog(ctx, false);
 534       _swrast_allow_vertex_fog(ctx, true);
 535    }
 536
 537    _mesa_meta_init(ctx);
 538
 539    intel->hw_stencil = mesaVis->stencilBits && mesaVis->depthBits == 24;
 540    intel->hw_stipple = 1;
 541
 542    intel->RenderIndex = ~0;
 543
 544    intelInitExtensions(ctx);
 545
 546    INTEL_DEBUG = driParseDebugString(getenv("INTEL_DEBUG"), debug_control);
 547    if (INTEL_DEBUG & DEBUG_BUFMGR)
 548       dri_bufmgr_set_debug(intel->bufmgr, true);
 549    if (INTEL_DEBUG & DEBUG_PERF)
 550       intel->perf_debug = true;
 551
 552    if (INTEL_DEBUG & DEBUG_AUB)
 553       drm_intel_bufmgr_gem_set_aub_dump(intel->bufmgr, true);
 554
 555    intel_batchbuffer_init(intel);
 556
 557    intel_fbo_init(intel);
 558
 559    intel->use_early_z = driQueryOptionb(&intel->optionCache, "early_z");
 560
 561    intel->prim.primitive = ~0;
 562
 563    /* Force all software fallbacks */
 564    if (driQueryOptionb(&intel->optionCache, "no_rast")) {
 565       fprintf(stderr, "disabling 3D rasterization\n");
 566       intel->no_rast = 1;
 567    }
 568
 569    if (driQueryOptionb(&intel->optionCache, "always_flush_batch")) {
 570       fprintf(stderr, "flushing batchbuffer before/after each draw call\n");
 571       intel->always_flush_batch = 1;
 572    }
 573
 574    if (driQueryOptionb(&intel->optionCache, "always_flush_cache")) {
 575       fprintf(stderr, "flushing GPU caches before/after each draw call\n");
 576       intel->always_flush_cache = 1;
 577    }
 578
 579    if (driQueryOptionb(&intel->optionCache, "disable_throttling")) {
 580       fprintf(stderr, "disabling flush throttling\n");
 581       intel->disable_throttling = 1;
 582    }
 583
 584    return true;
 585 }
 586
 587 void
 588 intelDestroyContext(__DRIcontext * driContextPriv)
 589 {
 590    struct intel_context *intel =
 591       (struct intel_context *) driContextPriv->driverPrivate;
 592    struct gl_context *ctx = &intel->ctx;
 593
 594    assert(intel);               /* should never be null */
 595    if (intel) {
 596       INTEL_FIREVERTICES(intel);
 597
 598       /* Dump a final BMP in case the application doesn't call SwapBuffers */
 599       if (INTEL_DEBUG & DEBUG_AUB) {
 600          intel_batchbuffer_flush(intel);
 601          aub_dump_bmp(&intel->ctx);
 602       }
 603
 604       _mesa_meta_free(&intel->ctx);
 605
 606       intel->vtbl.destroy(intel);
 607
 608       if (ctx->swrast_context) {
 609          _swsetup_DestroyContext(&intel->ctx);
 610          _tnl_DestroyContext(&intel->ctx);
 611       }
 612       _vbo_DestroyContext(&intel->ctx);
 613
 614       if (ctx->swrast_context)
 615          _swrast_DestroyContext(&intel->ctx);
 616       intel->Fallback = 0x0;      /* don't call _swrast_Flush later */
 617
 618       intel_batchbuffer_free(intel);
 619
 620       free(intel->prim.vb);
 621       intel->prim.vb = NULL;
 622       drm_intel_bo_unreference(intel->prim.vb_bo);
 623       intel->prim.vb_bo = NULL;
 624       drm_intel_bo_unreference(intel->first_post_swapbuffers_batch);
 625       intel->first_post_swapbuffers_batch = NULL;
 626
 627       driDestroyOptionCache(&intel->optionCache);
 628
 629       /* free the Mesa context */
 630       _mesa_free_context_data(&intel->ctx);
 631
 632       _math_matrix_dtr(&intel->ViewportMatrix);
 633
 634       ralloc_free(intel);
 635       driContextPriv->driverPrivate = NULL;
 636    }
 637 }
 638
 639 GLboolean
 640 intelUnbindContext(__DRIcontext * driContextPriv)
 641 {
 642    /* Unset current context and dispath table */
 643    _mesa_make_current(NULL, NULL, NULL);
 644
 645    return true;
 646 }
 647
 648 GLboolean
 649 intelMakeCurrent(__DRIcontext * driContextPriv,
 650                  __DRIdrawable * driDrawPriv,
 651                  __DRIdrawable * driReadPriv)
 652 {
 653    struct intel_context *intel;
 654    GET_CURRENT_CONTEXT(curCtx);
 655
 656    if (driContextPriv)
 657       intel = (struct intel_context *) driContextPriv->driverPrivate;
 658    else
 659       intel = NULL;
 660
 661    /* According to the glXMakeCurrent() man page: "Pending commands to
 662     * the previous context, if any, are flushed before it is released."
 663     * But only flush if we're actually changing contexts.
 664     */
 665    if (intel_context(curCtx) && intel_context(curCtx) != intel) {
 666       _mesa_flush(curCtx);
 667    }
 668
 669    if (driContextPriv) {
 670       struct gl_context *ctx = &intel->ctx;
 671       struct gl_framebuffer *fb, *readFb;
 672
 673       if (driDrawPriv == NULL && driReadPriv == NULL) {
 674          fb = _mesa_get_incomplete_framebuffer();
 675          readFb = _mesa_get_incomplete_framebuffer();
 676       } else {
 677          fb = driDrawPriv->driverPrivate;
 678          readFb = driReadPriv->driverPrivate;
 679          driContextPriv->dri2.draw_stamp = driDrawPriv->dri2.stamp - 1;
 680          driContextPriv->dri2.read_stamp = driReadPriv->dri2.stamp - 1;
 681       }
 682
 683       intel_prepare_render(intel);
 684       _mesa_make_current(ctx, fb, readFb);
 685
 686       /* We do this in intel_prepare_render() too, but intel->ctx.DrawBuffer
 687        * is NULL at that point.  We can't call _mesa_makecurrent()
 688        * first, since we need the buffer size for the initial
 689        * viewport.  So just call intel_draw_buffer() again here. */
 690       intel_draw_buffer(ctx);
 691    }
 692    else {
 693       _mesa_make_current(NULL, NULL, NULL);
 694    }
 695
 696    return true;
 697 }
 698
 699 /**
 700  * \brief Query DRI2 to obtain a DRIdrawable's buffers.
 701  *
 702  * To determine which DRI buffers to request, examine the renderbuffers
 703  * attached to the drawable's framebuffer. Then request the buffers with
 704  * DRI2GetBuffers() or DRI2GetBuffersWithFormat().
 705  *
 706  * This is called from intel_update_renderbuffers().
 707  *
 708  * \param drawable      Drawable whose buffers are queried.
 709  * \param buffers       [out] List of buffers returned by DRI2 query.
 710  * \param buffer_count  [out] Number of buffers returned.
 711  *
 712  * \see intel_update_renderbuffers()
 713  * \see DRI2GetBuffers()
 714  * \see DRI2GetBuffersWithFormat()
 715  */
 716 static void
 717 intel_query_dri2_buffers(struct intel_context *intel,
 718                          __DRIdrawable *drawable,
 719                          __DRIbuffer **buffers,
 720                          int *buffer_count)
 721 {
 722    __DRIscreen *screen = intel->intelScreen->driScrnPriv;
 723    struct gl_framebuffer *fb = drawable->driverPrivate;
 724    int i = 0;
 725    unsigned attachments[8];
 726
 727    struct intel_renderbuffer *front_rb;
 728    struct intel_renderbuffer *back_rb;
 729
 730    front_rb = intel_get_renderbuffer(fb, BUFFER_FRONT_LEFT);
 731    back_rb = intel_get_renderbuffer(fb, BUFFER_BACK_LEFT);
 732
 733    memset(attachments, 0, sizeof(attachments));
 734    if ((intel->is_front_buffer_rendering ||
 735         intel->is_front_buffer_reading ||
 736         !back_rb) && front_rb) {
 737       /* If a fake front buffer is in use, then querying for
 738        * __DRI_BUFFER_FRONT_LEFT will cause the server to copy the image from
 739        * the real front buffer to the fake front buffer.  So before doing the
 740        * query, we need to make sure all the pending drawing has landed in the
 741        * real front buffer.
 742        */
 743       intel_flush(&intel->ctx);
 744       intel_flush_front(&intel->ctx);
 745
 746       attachments[i++] = __DRI_BUFFER_FRONT_LEFT;
 747       attachments[i++] = intel_bits_per_pixel(front_rb);
 748    } else if (front_rb && intel->front_buffer_dirty) {
 749       /* We have pending front buffer rendering, but we aren't querying for a
 750        * front buffer.  If the front buffer we have is a fake front buffer,
 751        * the X server is going to throw it away when it processes the query.
 752        * So before doing the query, make sure all the pending drawing has
 753        * landed in the real front buffer.
 754        */
 755       intel_flush(&intel->ctx);
 756       intel_flush_front(&intel->ctx);
 757    }
 758
 759    if (back_rb) {
 760       attachments[i++] = __DRI_BUFFER_BACK_LEFT;
 761       attachments[i++] = intel_bits_per_pixel(back_rb);
 762    }
 763
 764    assert(i <= ARRAY_SIZE(attachments));
 765
 766    *buffers = screen->dri2.loader->getBuffersWithFormat(drawable,
 767                                                         &drawable->w,
 768                                                         &drawable->h,
 769                                                         attachments, i / 2,
 770                                                         buffer_count,
 771                                                         drawable->loaderPrivate);
 772 }
 773
 774 /**
 775  * \brief Assign a DRI buffer's DRM region to a renderbuffer.
 776  *
 777  * This is called from intel_update_renderbuffers().
 778  *
 779  * \par Note:
 780  *    DRI buffers whose attachment point is DRI2BufferStencil or
 781  *    DRI2BufferDepthStencil are handled as special cases.
 782  *
 783  * \param buffer_name is a human readable name, such as "dri2 front buffer",
 784  *        that is passed to intel_region_alloc_for_handle().
 785  *
 786  * \see intel_update_renderbuffers()
 787  * \see intel_region_alloc_for_handle()
 788  */
 789 static void
 790 intel_process_dri2_buffer(struct intel_context *intel,
 791                           __DRIdrawable *drawable,
 792                           __DRIbuffer *buffer,
 793                           struct intel_renderbuffer *rb,
 794                           const char *buffer_name)
 795 {
 796    struct intel_region *region = NULL;
 797
 798    if (!rb)
 799       return;
 800
 801    /* We try to avoid closing and reopening the same BO name, because the first
 802     * use of a mapping of the buffer involves a bunch of page faulting which is
 803     * moderately expensive.
 804     */
 805    if (rb->mt &&
 806        rb->mt->region &&
 807        rb->mt->region->name == buffer->name)
 808       return;
 809
 810    if (unlikely(INTEL_DEBUG & DEBUG_DRI)) {
 811       fprintf(stderr,
 812               "attaching buffer %d, at %d, cpp %d, pitch %d\n",
 813               buffer->name, buffer->attachment,
 814               buffer->cpp, buffer->pitch);
 815    }
 816
 817    intel_miptree_release(&rb->mt);
 818    region = intel_region_alloc_for_handle(intel->intelScreen,
 819                                           buffer->cpp,
 820                                           drawable->w,
 821                                           drawable->h,
 822                                           buffer->pitch,
 823                                           buffer->name,
 824                                           buffer_name);
 825    if (!region)
 826       return;
 827
 828    rb->mt = intel_miptree_create_for_dri2_buffer(intel,
 829                                                  buffer->attachment,
 830                                                  intel_rb_format(rb),
 831                                                  region);
 832    intel_region_release(&region);
 833 }