src/mesa/drivers/dri/i915/intel_screen.c

   1 /**************************************************************************
   2  *
   3  * Copyright 2003 VMware, Inc.
   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 VMWARE 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 #include <errno.h>
  29 #include <time.h>
  30 #include <unistd.h>
  31 #include "drm-uapi/drm_fourcc.h"
  32 #include "main/glheader.h"
  33 #include "main/context.h"
  34 #include "main/framebuffer.h"
  35 #include "main/renderbuffer.h"
  36 #include "main/texobj.h"
  37 #include "main/hash.h"
  38 #include "main/fbobject.h"
  39 #include "main/version.h"
  40 #include "swrast/s_renderbuffer.h"
  41
  42 #include "utils.h"
  43 #include "util/xmlpool.h"
  44
  45 static const __DRIconfigOptionsExtension i915_config_options = {
  46    .base = { __DRI_CONFIG_OPTIONS, 1 },
  47    .xml =
  48
  49 DRI_CONF_BEGIN
  50    DRI_CONF_SECTION_PERFORMANCE
  51       /* Options correspond to DRI_CONF_BO_REUSE_DISABLED,
  52        * DRI_CONF_BO_REUSE_ALL
  53        */
  54       DRI_CONF_OPT_BEGIN_V(bo_reuse, enum, 1, "0:1")
  55          DRI_CONF_DESC_BEGIN(en, "Buffer object reuse")
  56             DRI_CONF_ENUM(0, "Disable buffer object reuse")
  57             DRI_CONF_ENUM(1, "Enable reuse of all sizes of buffer objects")
  58          DRI_CONF_DESC_END
  59       DRI_CONF_OPT_END
  60
  61       DRI_CONF_OPT_BEGIN_B(fragment_shader, "true")
  62          DRI_CONF_DESC(en, "Enable limited ARB_fragment_shader support on 915/945.")
  63       DRI_CONF_OPT_END
  64
  65    DRI_CONF_SECTION_END
  66    DRI_CONF_SECTION_QUALITY
  67    DRI_CONF_SECTION_END
  68    DRI_CONF_SECTION_DEBUG
  69       DRI_CONF_ALWAYS_FLUSH_BATCH("false")
  70       DRI_CONF_ALWAYS_FLUSH_CACHE("false")
  71       DRI_CONF_DISABLE_THROTTLING("false")
  72       DRI_CONF_FORCE_GLSL_EXTENSIONS_WARN("false")
  73       DRI_CONF_DISABLE_GLSL_LINE_CONTINUATIONS("false")
  74       DRI_CONF_DISABLE_BLEND_FUNC_EXTENDED("false")
  75
  76       DRI_CONF_OPT_BEGIN_B(stub_occlusion_query, "false")
  77          DRI_CONF_DESC(en, "Enable stub ARB_occlusion_query support on 915/945.")
  78       DRI_CONF_OPT_END
  79
  80       DRI_CONF_OPT_BEGIN_B(shader_precompile, "true")
  81          DRI_CONF_DESC(en, "Perform code generation at shader link time.")
  82       DRI_CONF_OPT_END
  83    DRI_CONF_SECTION_END
  84 DRI_CONF_END
  85 };
  86
  87 #include "intel_batchbuffer.h"
  88 #include "intel_buffers.h"
  89 #include "intel_bufmgr.h"
  90 #include "intel_chipset.h"
  91 #include "intel_fbo.h"
  92 #include "intel_mipmap_tree.h"
  93 #include "intel_screen.h"
  94 #include "intel_tex.h"
  95 #include "intel_regions.h"
  96
  97 #include "drm-uapi/i915_drm.h"
  98
  99 /**
 100  * For debugging purposes, this returns a time in seconds.
 101  */
 102 double
 103 get_time(void)
 104 {
 105    struct timespec tp;
 106
 107    clock_gettime(CLOCK_MONOTONIC, &tp);
 108
 109    return tp.tv_sec + tp.tv_nsec / 1000000000.0;
 110 }
 111
 112 void
 113 aub_dump_bmp(struct gl_context *ctx)
 114 {
 115    struct gl_framebuffer *fb = ctx->DrawBuffer;
 116
 117    for (int i = 0; i < fb->_NumColorDrawBuffers; i++) {
 118       struct intel_renderbuffer *irb =
 119          intel_renderbuffer(fb->_ColorDrawBuffers[i]);
 120
 121       if (irb && irb->mt) {
 122          enum aub_dump_bmp_format format;
 123
 124          switch (irb->Base.Base.Format) {
 125          case MESA_FORMAT_B8G8R8A8_UNORM:
 126          case MESA_FORMAT_B8G8R8X8_UNORM:
 127             format = AUB_DUMP_BMP_FORMAT_ARGB_8888;
 128             break;
 129          default:
 130             continue;
 131          }
 132
 133          assert(irb->mt->region->pitch % irb->mt->region->cpp == 0);
 134          drm_intel_gem_bo_aub_dump_bmp(irb->mt->region->bo,
 135                                        irb->draw_x,
 136                                        irb->draw_y,
 137                                        irb->Base.Base.Width,
 138                                        irb->Base.Base.Height,
 139                                        format,
 140                                        irb->mt->region->pitch,
 141                                        0);
 142       }
 143    }
 144 }
 145
 146 static const __DRItexBufferExtension intelTexBufferExtension = {
 147    .base = { __DRI_TEX_BUFFER, 3 },
 148
 149    .setTexBuffer        = intelSetTexBuffer,
 150    .setTexBuffer2       = intelSetTexBuffer2,
 151    .releaseTexBuffer    = NULL,
 152 };
 153
 154 static void
 155 intelDRI2Flush(__DRIdrawable *drawable)
 156 {
 157    GET_CURRENT_CONTEXT(ctx);
 158    struct intel_context *intel = intel_context(ctx);
 159    if (intel == NULL)
 160       return;
 161
 162    INTEL_FIREVERTICES(intel);
 163
 164    intel->need_throttle = true;
 165
 166    if (intel->batch.used)
 167       intel_batchbuffer_flush(intel);
 168
 169    if (INTEL_DEBUG & DEBUG_AUB) {
 170       aub_dump_bmp(ctx);
 171    }
 172 }
 173
 174 static const struct __DRI2flushExtensionRec intelFlushExtension = {
 175     .base = { __DRI2_FLUSH, 3 },
 176
 177     .flush              = intelDRI2Flush,
 178     .invalidate         = dri2InvalidateDrawable,
 179 };
 180
 181 static struct intel_image_format intel_image_formats[] = {
 182    { DRM_FORMAT_ARGB8888, __DRI_IMAGE_COMPONENTS_RGBA, 1,
 183      { { 0, 0, 0, __DRI_IMAGE_FORMAT_ARGB8888, 4 } } },
 184
 185    { __DRI_IMAGE_FOURCC_SARGB8888, __DRI_IMAGE_COMPONENTS_RGBA, 1,
 186      { { 0, 0, 0, __DRI_IMAGE_FORMAT_SARGB8, 4 } } },
 187
 188    { DRM_FORMAT_XRGB8888, __DRI_IMAGE_COMPONENTS_RGB, 1,
 189      { { 0, 0, 0, __DRI_IMAGE_FORMAT_XRGB8888, 4 }, } },
 190
 191    { DRM_FORMAT_YUV410, __DRI_IMAGE_COMPONENTS_Y_U_V, 3,
 192      { { 0, 0, 0, __DRI_IMAGE_FORMAT_R8, 1 },
 193        { 1, 2, 2, __DRI_IMAGE_FORMAT_R8, 1 },
 194        { 2, 2, 2, __DRI_IMAGE_FORMAT_R8, 1 } } },
 195
 196    { DRM_FORMAT_YUV411, __DRI_IMAGE_COMPONENTS_Y_U_V, 3,
 197      { { 0, 0, 0, __DRI_IMAGE_FORMAT_R8, 1 },
 198        { 1, 2, 0, __DRI_IMAGE_FORMAT_R8, 1 },
 199        { 2, 2, 0, __DRI_IMAGE_FORMAT_R8, 1 } } },
 200
 201    { DRM_FORMAT_YUV420, __DRI_IMAGE_COMPONENTS_Y_U_V, 3,
 202      { { 0, 0, 0, __DRI_IMAGE_FORMAT_R8, 1 },
 203        { 1, 1, 1, __DRI_IMAGE_FORMAT_R8, 1 },
 204        { 2, 1, 1, __DRI_IMAGE_FORMAT_R8, 1 } } },
 205
 206    { DRM_FORMAT_YUV422, __DRI_IMAGE_COMPONENTS_Y_U_V, 3,
 207      { { 0, 0, 0, __DRI_IMAGE_FORMAT_R8, 1 },
 208        { 1, 1, 0, __DRI_IMAGE_FORMAT_R8, 1 },
 209        { 2, 1, 0, __DRI_IMAGE_FORMAT_R8, 1 } } },
 210
 211    { DRM_FORMAT_YUV444, __DRI_IMAGE_COMPONENTS_Y_U_V, 3,
 212      { { 0, 0, 0, __DRI_IMAGE_FORMAT_R8, 1 },
 213        { 1, 0, 0, __DRI_IMAGE_FORMAT_R8, 1 },
 214        { 2, 0, 0, __DRI_IMAGE_FORMAT_R8, 1 } } },
 215
 216    { DRM_FORMAT_NV12, __DRI_IMAGE_COMPONENTS_Y_UV, 2,
 217      { { 0, 0, 0, __DRI_IMAGE_FORMAT_R8, 1 },
 218        { 1, 1, 1, __DRI_IMAGE_FORMAT_GR88, 2 } } },
 219
 220    { DRM_FORMAT_NV16, __DRI_IMAGE_COMPONENTS_Y_UV, 2,
 221      { { 0, 0, 0, __DRI_IMAGE_FORMAT_R8, 1 },
 222        { 1, 1, 0, __DRI_IMAGE_FORMAT_GR88, 2 } } },
 223
 224    /* For YUYV and UYVY buffers, we set up two overlapping DRI images
 225     * and treat them as planar buffers in the compositors.
 226     * Plane 0 is GR88 and samples YU or YV pairs and places Y into
 227     * the R component, while plane 1 is ARGB/ABGR and samples YUYV/UYVY
 228     * clusters and places pairs and places U into the G component and
 229     * V into A.  This lets the texture sampler interpolate the Y
 230     * components correctly when sampling from plane 0, and interpolate
 231     * U and V correctly when sampling from plane 1. */
 232    { DRM_FORMAT_YUYV, __DRI_IMAGE_COMPONENTS_Y_XUXV, 2,
 233      { { 0, 0, 0, __DRI_IMAGE_FORMAT_GR88, 2 },
 234        { 0, 1, 0, __DRI_IMAGE_FORMAT_ARGB8888, 4 } } },
 235    { DRM_FORMAT_UYVY, __DRI_IMAGE_COMPONENTS_Y_UXVX, 2,
 236      { { 0, 0, 0, __DRI_IMAGE_FORMAT_GR88, 2 },
 237        { 0, 1, 0, __DRI_IMAGE_FORMAT_ABGR8888, 4 } } }
 238 };
 239
 240 static __DRIimage *
 241 intel_allocate_image(int dri_format, void *loaderPrivate)
 242 {
 243     __DRIimage *image;
 244
 245     image = calloc(1, sizeof *image);
 246     if (image == NULL)
 247         return NULL;
 248
 249     image->dri_format = dri_format;
 250     image->offset = 0;
 251
 252     image->format = driImageFormatToGLFormat(dri_format);
 253     if (dri_format != __DRI_IMAGE_FORMAT_NONE &&
 254         image->format == MESA_FORMAT_NONE) {
 255        free(image);
 256        return NULL;
 257     }
 258
 259     image->internal_format = _mesa_get_format_base_format(image->format);
 260     image->data = loaderPrivate;
 261
 262     return image;
 263 }
 264
 265 /**
 266  * Sets up a DRIImage structure to point to our shared image in a region
 267  */
 268 static void
 269 intel_setup_image_from_mipmap_tree(struct intel_context *intel, __DRIimage *image,
 270                                    struct intel_mipmap_tree *mt, GLuint level,
 271                                    GLuint zoffset)
 272 {
 273    unsigned int draw_x, draw_y;
 274    uint32_t mask_x, mask_y;
 275
 276    intel_miptree_check_level_layer(mt, level, zoffset);
 277
 278    intel_region_get_tile_masks(mt->region, &mask_x, &mask_y);
 279    intel_miptree_get_image_offset(mt, level, zoffset, &draw_x, &draw_y);
 280
 281    image->width = mt->level[level].width;
 282    image->height = mt->level[level].height;
 283    image->tile_x = draw_x & mask_x;
 284    image->tile_y = draw_y & mask_y;
 285
 286    image->offset = intel_region_get_aligned_offset(mt->region,
 287                                                    draw_x & ~mask_x,
 288                                                    draw_y & ~mask_y);
 289
 290    intel_region_reference(&image->region, mt->region);
 291 }
 292
 293 static void
 294 intel_setup_image_from_dimensions(__DRIimage *image)
 295 {
 296    image->width    = image->region->width;
 297    image->height   = image->region->height;
 298    image->tile_x = 0;
 299    image->tile_y = 0;
 300 }
 301
 302 static __DRIimage *
 303 intel_create_image_from_name(__DRIscreen *screen,
 304                              int width, int height, int format,
 305                              int name, int pitch, void *loaderPrivate)
 306 {
 307     struct intel_screen *intelScreen = screen->driverPrivate;
 308     __DRIimage *image;
 309     int cpp;
 310
 311     image = intel_allocate_image(format, loaderPrivate);
 312     if (image == NULL)
 313        return NULL;
 314
 315     if (image->format == MESA_FORMAT_NONE)
 316        cpp = 1;
 317     else
 318        cpp = _mesa_get_format_bytes(image->format);
 319     image->region = intel_region_alloc_for_handle(intelScreen,
 320                                                   cpp, width, height,
 321                                                   pitch * cpp, name, "image");
 322     if (image->region == NULL) {
 323        free(image);
 324        return NULL;
 325     }
 326
 327     intel_setup_image_from_dimensions(image);
 328
 329     return image;
 330 }
 331
 332 static __DRIimage *
 333 intel_create_image_from_renderbuffer(__DRIcontext *context,
 334                                      int renderbuffer, void *loaderPrivate)
 335 {
 336    __DRIimage *image;
 337    struct intel_context *intel = context->driverPrivate;
 338    struct gl_renderbuffer *rb;
 339    struct intel_renderbuffer *irb;
 340
 341    rb = _mesa_lookup_renderbuffer(&intel->ctx, renderbuffer);
 342    if (!rb) {
 343       _mesa_error(&intel->ctx,
 344                   GL_INVALID_OPERATION, "glRenderbufferExternalMESA");
 345       return NULL;
 346    }
 347
 348    irb = intel_renderbuffer(rb);
 349    image = calloc(1, sizeof *image);
 350    if (image == NULL)
 351       return NULL;
 352
 353    image->internal_format = rb->InternalFormat;
 354    image->format = rb->Format;
 355    image->offset = 0;
 356    image->data = loaderPrivate;
 357    intel_region_reference(&image->region, irb->mt->region);
 358    intel_setup_image_from_dimensions(image);
 359    image->dri_format = driGLFormatToImageFormat(image->format);
 360
 361    rb->NeedsFinishRenderTexture = true;
 362    return image;
 363 }
 364
 365 static __DRIimage *
 366 intel_create_image_from_texture(__DRIcontext *context, int target,
 367                                 unsigned texture, int zoffset,
 368                                 int level,
 369                                 unsigned *error,
 370                                 void *loaderPrivate)
 371 {
 372    __DRIimage *image;
 373    struct intel_context *intel = context->driverPrivate;
 374    struct gl_texture_object *obj;
 375    struct intel_texture_object *iobj;
 376    GLuint face = 0;
 377
 378    obj = _mesa_lookup_texture(&intel->ctx, texture);
 379    if (!obj || obj->Target != target) {
 380       *error = __DRI_IMAGE_ERROR_BAD_PARAMETER;
 381       return NULL;
 382    }
 383
 384    if (target == GL_TEXTURE_CUBE_MAP)
 385       face = zoffset;
 386
 387    _mesa_test_texobj_completeness(&intel->ctx, obj);
 388    iobj = intel_texture_object(obj);
 389    if (!obj->_BaseComplete || (level > 0 && !obj->_MipmapComplete)) {
 390       *error = __DRI_IMAGE_ERROR_BAD_PARAMETER;
 391       return NULL;
 392    }
 393
 394    if (level < obj->BaseLevel || level > obj->_MaxLevel) {
 395       *error = __DRI_IMAGE_ERROR_BAD_MATCH;
 396       return NULL;
 397    }
 398
 399    if (target == GL_TEXTURE_3D && obj->Image[face][level]->Depth < zoffset) {
 400       *error = __DRI_IMAGE_ERROR_BAD_MATCH;
 401       return NULL;
 402    }
 403    image = calloc(1, sizeof *image);
 404    if (image == NULL) {
 405       *error = __DRI_IMAGE_ERROR_BAD_ALLOC;
 406       return NULL;
 407    }
 408
 409    image->internal_format = obj->Image[face][level]->InternalFormat;
 410    image->format = obj->Image[face][level]->TexFormat;
 411    image->data = loaderPrivate;
 412    intel_setup_image_from_mipmap_tree(intel, image, iobj->mt, level, zoffset);
 413    image->dri_format = driGLFormatToImageFormat(image->format);
 414    if (image->dri_format == __DRI_IMAGE_FORMAT_NONE) {
 415       *error = __DRI_IMAGE_ERROR_BAD_PARAMETER;
 416       free(image);
 417       return NULL;
 418    }
 419
 420    *error = __DRI_IMAGE_ERROR_SUCCESS;
 421    return image;
 422 }
 423
 424 static void
 425 intel_destroy_image(__DRIimage *image)
 426 {
 427     intel_region_release(&image->region);
 428     free(image);
 429 }
 430
 431 static __DRIimage *
 432 intel_create_image(__DRIscreen *screen,
 433                    int width, int height, int format,
 434                    unsigned int use,
 435                    void *loaderPrivate)
 436 {
 437    __DRIimage *image;
 438    struct intel_screen *intelScreen = screen->driverPrivate;
 439    uint32_t tiling;
 440    int cpp;
 441
 442    tiling = I915_TILING_X;
 443    if (use & __DRI_IMAGE_USE_CURSOR) {
 444       if (width != 64 || height != 64)
 445          return NULL;
 446       tiling = I915_TILING_NONE;
 447    }
 448
 449    if (use & __DRI_IMAGE_USE_LINEAR)
 450       tiling = I915_TILING_NONE;
 451
 452    image = intel_allocate_image(format, loaderPrivate);
 453    if (image == NULL)
 454       return NULL;
 455
 456    cpp = _mesa_get_format_bytes(image->format);
 457    image->region =
 458       intel_region_alloc(intelScreen, tiling, cpp, width, height, true);
 459    if (image->region == NULL) {
 460       free(image);
 461       return NULL;
 462    }
 463
 464    intel_setup_image_from_dimensions(image);
 465
 466    return image;
 467 }
 468
 469 static GLboolean
 470 intel_query_image(__DRIimage *image, int attrib, int *value)
 471 {
 472    switch (attrib) {
 473    case __DRI_IMAGE_ATTRIB_STRIDE:
 474       *value = image->region->pitch;
 475       return true;
 476    case __DRI_IMAGE_ATTRIB_HANDLE:
 477       *value = image->region->bo->handle;
 478       return true;
 479    case __DRI_IMAGE_ATTRIB_NAME:
 480       return intel_region_flink(image->region, (uint32_t *) value);
 481    case __DRI_IMAGE_ATTRIB_FORMAT:
 482       *value = image->dri_format;
 483       return true;
 484    case __DRI_IMAGE_ATTRIB_WIDTH:
 485       *value = image->region->width;
 486       return true;
 487    case __DRI_IMAGE_ATTRIB_HEIGHT:
 488       *value = image->region->height;
 489       return true;
 490    case __DRI_IMAGE_ATTRIB_COMPONENTS:
 491       if (image->planar_format == NULL)
 492          return false;
 493       *value = image->planar_format->components;
 494       return true;
 495    case __DRI_IMAGE_ATTRIB_FD:
 496       return !drm_intel_bo_gem_export_to_prime(image->region->bo, value);
 497   default:
 498       return false;
 499    }
 500 }
 501
 502 static __DRIimage *
 503 intel_dup_image(__DRIimage *orig_image, void *loaderPrivate)
 504 {
 505    __DRIimage *image;
 506
 507    image = calloc(1, sizeof *image);
 508    if (image == NULL)
 509       return NULL;
 510
 511    intel_region_reference(&image->region, orig_image->region);
 512    if (image->region == NULL) {
 513       free(image);
 514       return NULL;
 515    }
 516
 517    image->internal_format = orig_image->internal_format;
 518    image->planar_format   = orig_image->planar_format;
 519    image->dri_format      = orig_image->dri_format;
 520    image->format          = orig_image->format;
 521    image->offset          = orig_image->offset;
 522    image->width           = orig_image->width;
 523    image->height          = orig_image->height;
 524    image->tile_x          = orig_image->tile_x;
 525    image->tile_y          = orig_image->tile_y;
 526    image->data            = loaderPrivate;
 527
 528    memcpy(image->strides, orig_image->strides, sizeof(image->strides));
 529    memcpy(image->offsets, orig_image->offsets, sizeof(image->offsets));
 530
 531    return image;
 532 }
 533
 534 static GLboolean
 535 intel_validate_usage(__DRIimage *image, unsigned int use)
 536 {
 537    if (use & __DRI_IMAGE_USE_CURSOR) {
 538       if (image->region->width != 64 || image->region->height != 64)
 539          return GL_FALSE;
 540    }
 541
 542    return GL_TRUE;
 543 }
 544
 545 static __DRIimage *
 546 intel_create_image_from_names(__DRIscreen *screen,
 547                               int width, int height, int fourcc,
 548                               int *names, int num_names,
 549                               int *strides, int *offsets,
 550                               void *loaderPrivate)
 551 {
 552     struct intel_image_format *f = NULL;
 553     __DRIimage *image;
 554     int i, index;
 555
 556     if (screen == NULL || names == NULL || num_names != 1)
 557         return NULL;
 558
 559     for (i = 0; i < ARRAY_SIZE(intel_image_formats); i++) {
 560         if (intel_image_formats[i].fourcc == fourcc) {
 561            f = &intel_image_formats[i];
 562         }
 563     }
 564
 565     if (f == NULL)
 566         return NULL;
 567
 568     image = intel_create_image_from_name(screen, width, height,
 569                                          __DRI_IMAGE_FORMAT_NONE,
 570                                          names[0], strides[0],
 571                                          loaderPrivate);
 572
 573    if (image == NULL)
 574       return NULL;
 575
 576     image->planar_format = f;
 577     for (i = 0; i < f->nplanes; i++) {
 578         index = f->planes[i].buffer_index;
 579         image->offsets[index] = offsets[index];
 580         image->strides[index] = strides[index];
 581     }
 582
 583     return image;
 584 }
 585
 586 static __DRIimage *
 587 intel_create_image_from_fds(__DRIscreen *screen,
 588                             int width, int height, int fourcc,
 589                             int *fds, int num_fds, int *strides, int *offsets,
 590                             void *loaderPrivate)
 591 {
 592    struct intel_screen *intelScreen = screen->driverPrivate;
 593    struct intel_image_format *f = NULL;
 594    __DRIimage *image;
 595    int i, index;
 596
 597    if (fds == NULL || num_fds != 1)
 598       return NULL;
 599
 600    for (i = 0; i < ARRAY_SIZE(intel_image_formats); i++) {
 601       if (intel_image_formats[i].fourcc == fourcc) {
 602          f = &intel_image_formats[i];
 603       }
 604    }
 605
 606    if (f == NULL)
 607       return NULL;
 608
 609    image = intel_allocate_image(__DRI_IMAGE_FORMAT_NONE, loaderPrivate);
 610    if (image == NULL)
 611       return NULL;
 612
 613    image->region = intel_region_alloc_for_fd(intelScreen,
 614                                              f->planes[0].cpp, width, height, strides[0],
 615                                              height * strides[0], fds[0], "image");
 616    if (image->region == NULL) {
 617       free(image);
 618       return NULL;
 619    }
 620
 621    intel_setup_image_from_dimensions(image);
 622
 623    image->planar_format = f;
 624    for (i = 0; i < f->nplanes; i++) {
 625       index = f->planes[i].buffer_index;
 626       image->offsets[index] = offsets[index];
 627       image->strides[index] = strides[index];
 628    }
 629
 630    return image;
 631 }
 632
 633
 634 static __DRIimage *
 635 intel_from_planar(__DRIimage *parent, int plane, void *loaderPrivate)
 636 {
 637     int width, height, offset, stride, dri_format, index;
 638     struct intel_image_format *f;
 639     uint32_t mask_x, mask_y;
 640     __DRIimage *image;
 641
 642     if (parent == NULL || parent->planar_format == NULL)
 643         return NULL;
 644
 645     f = parent->planar_format;
 646
 647     if (plane >= f->nplanes)
 648         return NULL;
 649
 650     width = parent->region->width >> f->planes[plane].width_shift;
 651     height = parent->region->height >> f->planes[plane].height_shift;
 652     dri_format = f->planes[plane].dri_format;
 653     index = f->planes[plane].buffer_index;
 654     offset = parent->offsets[index];
 655     stride = parent->strides[index];
 656
 657     image = intel_allocate_image(dri_format, loaderPrivate);
 658     if (image == NULL)
 659        return NULL;
 660
 661     if (offset + height * stride > parent->region->bo->size) {
 662        _mesa_warning(NULL, "intel_create_sub_image: subimage out of bounds");
 663        free(image);
 664        return NULL;
 665     }
 666
 667     image->region = calloc(sizeof(*image->region), 1);
 668     if (image->region == NULL) {
 669        free(image);
 670        return NULL;
 671     }
 672
 673     image->region->cpp = _mesa_get_format_bytes(image->format);
 674     image->region->width = width;
 675     image->region->height = height;
 676     image->region->pitch = stride;
 677     image->region->refcount = 1;
 678     image->region->bo = parent->region->bo;
 679     drm_intel_bo_reference(image->region->bo);
 680     image->region->tiling = parent->region->tiling;
 681     image->offset = offset;
 682     intel_setup_image_from_dimensions(image);
 683
 684     intel_region_get_tile_masks(image->region, &mask_x, &mask_y);
 685     if (offset & mask_x)
 686        _mesa_warning(NULL,
 687                      "intel_create_sub_image: offset not on tile boundary");
 688
 689     return image;
 690 }
 691
 692 static const __DRIimageExtension intelImageExtension = {
 693     .base = { __DRI_IMAGE, 7 },
 694
 695     .createImageFromName                = intel_create_image_from_name,
 696     .createImageFromRenderbuffer        = intel_create_image_from_renderbuffer,
 697     .destroyImage                       = intel_destroy_image,
 698     .createImage                        = intel_create_image,
 699     .queryImage                         = intel_query_image,
 700     .dupImage                           = intel_dup_image,
 701     .validateUsage                      = intel_validate_usage,
 702     .createImageFromNames               = intel_create_image_from_names,
 703     .fromPlanar                         = intel_from_planar,
 704     .createImageFromTexture             = intel_create_image_from_texture,
 705     .createImageFromFds                 = intel_create_image_from_fds
 706 };
 707
 708 static int
 709 i915_query_renderer_integer(__DRIscreen *psp, int param, unsigned int *value)
 710 {
 711    const struct intel_screen *const intelScreen =
 712       (struct intel_screen *) psp->driverPrivate;
 713
 714    switch (param) {
 715    case __DRI2_RENDERER_VENDOR_ID:
 716       value[0] = 0x8086;
 717       return 0;
 718    case __DRI2_RENDERER_DEVICE_ID:
 719       value[0] = intelScreen->deviceID;
 720       return 0;
 721    case __DRI2_RENDERER_ACCELERATED:
 722       value[0] = 1;
 723       return 0;
 724    case __DRI2_RENDERER_VIDEO_MEMORY: {
 725       /* Once a batch uses more than 75% of the maximum mappable size, we
 726        * assume that there's some fragmentation, and we start doing extra
 727        * flushing, etc.  That's the big cliff apps will care about.
 728        */
 729       size_t aper_size;
 730       size_t mappable_size;
 731
 732       drm_intel_get_aperture_sizes(psp->fd, &mappable_size, &aper_size);
 733
 734       const unsigned gpu_mappable_megabytes =
 735          (aper_size / (1024 * 1024)) * 3 / 4;
 736
 737       const long system_memory_pages = sysconf(_SC_PHYS_PAGES);
 738       const long system_page_size = sysconf(_SC_PAGE_SIZE);
 739
 740       if (system_memory_pages <= 0 || system_page_size <= 0)
 741          return -1;
 742
 743       const uint64_t system_memory_bytes = (uint64_t) system_memory_pages
 744          * (uint64_t) system_page_size;
 745
 746       const unsigned system_memory_megabytes =
 747          (unsigned) (system_memory_bytes / (1024 * 1024));
 748
 749       value[0] = MIN2(system_memory_megabytes, gpu_mappable_megabytes);
 750       return 0;
 751    }
 752    case __DRI2_RENDERER_UNIFIED_MEMORY_ARCHITECTURE:
 753       value[0] = 1;
 754       return 0;
 755    case __DRI2_RENDERER_HAS_TEXTURE_3D:
 756       value[0] = 1;
 757       return 0;
 758    default:
 759       return driQueryRendererIntegerCommon(psp, param, value);
 760    }
 761
 762    return -1;
 763 }
 764
 765 static int
 766 i915_query_renderer_string(__DRIscreen *psp, int param, const char **value)
 767 {
 768    const struct intel_screen *intelScreen =
 769       (struct intel_screen *) psp->driverPrivate;
 770
 771    switch (param) {
 772    case __DRI2_RENDERER_VENDOR_ID:
 773       value[0] = i915_vendor_string;
 774       return 0;
 775    case __DRI2_RENDERER_DEVICE_ID:
 776       value[0] = i915_get_renderer_string(intelScreen->deviceID);
 777       return 0;
 778    default:
 779       break;
 780    }
 781
 782    return -1;
 783 }
 784
 785 static const __DRI2rendererQueryExtension intelRendererQueryExtension = {
 786    .base = { __DRI2_RENDERER_QUERY, 1 },
 787
 788    .queryInteger = i915_query_renderer_integer,
 789    .queryString = i915_query_renderer_string
 790 };
 791
 792 static const __DRIextension *intelScreenExtensions[] = {
 793     &intelTexBufferExtension.base,
 794     &intelFenceExtension.base,
 795     &intelFlushExtension.base,
 796     &intelImageExtension.base,
 797     &intelRendererQueryExtension.base,
 798     &dri2ConfigQueryExtension.base,
 799     &dri2NoErrorExtension.base,
 800     NULL
 801 };
 802
 803 static bool
 804 intel_get_param(__DRIscreen *psp, int param, int *value)
 805 {
 806    int ret;
 807    struct drm_i915_getparam gp;
 808
 809    memset(&gp, 0, sizeof(gp));
 810    gp.param = param;
 811    gp.value = value;
 812
 813    ret = drmCommandWriteRead(psp->fd, DRM_I915_GETPARAM, &gp, sizeof(gp));
 814    if (ret) {
 815       if (ret != -EINVAL)
 816          _mesa_warning(NULL, "drm_i915_getparam: %d", ret);
 817       return false;
 818    }
 819
 820    return true;
 821 }
 822
 823 static bool
 824 intel_get_boolean(__DRIscreen *psp, int param)
 825 {
 826    int value = 0;
 827    return intel_get_param(psp, param, &value) && value;
 828 }
 829
 830 static void
 831 intelDestroyScreen(__DRIscreen * sPriv)
 832 {
 833    struct intel_screen *intelScreen = sPriv->driverPrivate;
 834
 835    dri_bufmgr_destroy(intelScreen->bufmgr);
 836    driDestroyOptionInfo(&intelScreen->optionCache);
 837
 838    free(intelScreen);
 839    sPriv->driverPrivate = NULL;
 840 }
 841
 842
 843 /**
 844  * This is called when we need to set up GL rendering to a new X window.
 845  */
 846 static GLboolean
 847 intelCreateBuffer(__DRIscreen * driScrnPriv,
 848                   __DRIdrawable * driDrawPriv,
 849                   const struct gl_config * mesaVis, GLboolean isPixmap)
 850 {
 851    struct intel_renderbuffer *rb;
 852    mesa_format rgbFormat;
 853    struct gl_framebuffer *fb;
 854
 855    if (isPixmap)
 856       return false;
 857
 858    fb = CALLOC_STRUCT(gl_framebuffer);
 859    if (!fb)
 860       return false;
 861
 862    _mesa_initialize_window_framebuffer(fb, mesaVis);
 863
 864    if (mesaVis->redBits == 5)
 865       rgbFormat = MESA_FORMAT_B5G6R5_UNORM;
 866    else if (mesaVis->sRGBCapable)
 867       rgbFormat = MESA_FORMAT_B8G8R8A8_SRGB;
 868    else if (mesaVis->alphaBits == 0)
 869       rgbFormat = MESA_FORMAT_B8G8R8X8_UNORM;
 870    else
 871       rgbFormat = MESA_FORMAT_B8G8R8A8_UNORM;
 872
 873    /* setup the hardware-based renderbuffers */
 874    rb = intel_create_renderbuffer(rgbFormat);
 875    _mesa_attach_and_own_rb(fb, BUFFER_FRONT_LEFT, &rb->Base.Base);
 876
 877    if (mesaVis->doubleBufferMode) {
 878       rb = intel_create_renderbuffer(rgbFormat);
 879       _mesa_attach_and_own_rb(fb, BUFFER_BACK_LEFT, &rb->Base.Base);
 880    }
 881
 882    /*
 883     * Assert here that the gl_config has an expected depth/stencil bit
 884     * combination: one of d24/s8, d16/s0, d0/s0. (See intelInitScreen2(),
 885     * which constructs the advertised configs.)
 886     */
 887    if (mesaVis->depthBits == 24) {
 888       assert(mesaVis->stencilBits == 8);
 889
 890       /*
 891        * Use combined depth/stencil. Note that the renderbuffer is
 892        * attached to two attachment points.
 893        */
 894       rb = intel_create_private_renderbuffer(MESA_FORMAT_Z24_UNORM_S8_UINT);
 895       _mesa_attach_and_own_rb(fb, BUFFER_DEPTH, &rb->Base.Base);
 896       _mesa_attach_and_reference_rb(fb, BUFFER_STENCIL, &rb->Base.Base);
 897    }
 898    else if (mesaVis->depthBits == 16) {
 899       assert(mesaVis->stencilBits == 0);
 900       rb = intel_create_private_renderbuffer(MESA_FORMAT_Z_UNORM16);
 901       _mesa_attach_and_own_rb(fb, BUFFER_DEPTH, &rb->Base.Base);
 902    }
 903    else {
 904       assert(mesaVis->depthBits == 0);
 905       assert(mesaVis->stencilBits == 0);
 906    }
 907
 908    /* now add any/all software-based renderbuffers we may need */
 909    _swrast_add_soft_renderbuffers(fb,
 910                                   false, /* never sw color */
 911                                   false, /* never sw depth */
 912                                   false, /* never sw stencil */
 913                                   mesaVis->accumRedBits > 0,
 914                                   false, /* never sw alpha */
 915                                   false  /* never sw aux */ );
 916    driDrawPriv->driverPrivate = fb;
 917
 918    return true;
 919 }
 920
 921 static void
 922 intelDestroyBuffer(__DRIdrawable * driDrawPriv)
 923 {
 924     struct gl_framebuffer *fb = driDrawPriv->driverPrivate;
 925
 926     _mesa_reference_framebuffer(&fb, NULL);
 927 }
 928
 929 /* There are probably better ways to do this, such as an
 930  * init-designated function to register chipids and createcontext
 931  * functions.
 932  */
 933 extern bool
 934 i830CreateContext(int api,
 935                   const struct gl_config *mesaVis,
 936                   __DRIcontext *driContextPriv,
 937                   unsigned major_version,
 938                   unsigned minor_version,
 939                   uint32_t flags,
 940                   unsigned *error,
 941                   void *sharedContextPrivate);
 942
 943 extern bool
 944 i915CreateContext(int api,
 945                   const struct gl_config *mesaVis,
 946                   __DRIcontext *driContextPriv,
 947                   unsigned major_version,
 948                   unsigned minor_version,
 949                   uint32_t flags,
 950                   unsigned *error,
 951                   void *sharedContextPrivate);
 952
 953 static GLboolean
 954 intelCreateContext(gl_api api,
 955                    const struct gl_config * mesaVis,
 956                    __DRIcontext * driContextPriv,
 957                    const struct __DriverContextConfig *ctx_config,
 958                    unsigned *error,
 959                    void *sharedContextPrivate)
 960 {
 961    bool success = false;
 962
 963    __DRIscreen *sPriv = driContextPriv->driScreenPriv;
 964    struct intel_screen *intelScreen = sPriv->driverPrivate;
 965
 966    if (ctx_config->flags & ~(__DRI_CTX_FLAG_DEBUG | __DRI_CTX_FLAG_NO_ERROR)) {
 967       *error = __DRI_CTX_ERROR_UNKNOWN_FLAG;
 968       return false;
 969    }
 970
 971    if (ctx_config->attribute_mask) {
 972       *error = __DRI_CTX_ERROR_UNKNOWN_ATTRIBUTE;
 973       return false;
 974    }
 975
 976    if (IS_GEN3(intelScreen->deviceID)) {
 977       success = i915CreateContext(api, mesaVis, driContextPriv,
 978                                   ctx_config->major_version,
 979                                   ctx_config->minor_version,
 980                                   ctx_config->flags,
 981                                   error, sharedContextPrivate);
 982    } else {
 983       intelScreen->no_vbo = true;
 984       success = i830CreateContext(api, mesaVis, driContextPriv,
 985                                   ctx_config->major_version,
 986                                   ctx_config->minor_version,
 987                                   ctx_config->flags,
 988                                   error, sharedContextPrivate);
 989    }
 990
 991    if (success)
 992       return true;
 993
 994    if (driContextPriv->driverPrivate != NULL)
 995       intelDestroyContext(driContextPriv);
 996
 997    return false;
 998 }
 999
1000 static bool
1001 intel_init_bufmgr(struct intel_screen *intelScreen)
1002 {
1003    __DRIscreen *spriv = intelScreen->driScrnPriv;
1004
1005    intelScreen->no_hw = getenv("INTEL_NO_HW") != NULL;
1006
1007    intelScreen->bufmgr = intel_bufmgr_gem_init(spriv->fd, BATCH_SZ);
1008    if (intelScreen->bufmgr == NULL) {
1009       fprintf(stderr, "[%s:%u] Error initializing buffer manager.\n",
1010               __func__, __LINE__);
1011       return false;
1012    }
1013
1014    drm_intel_bufmgr_gem_enable_fenced_relocs(intelScreen->bufmgr);
1015
1016    if (!intel_get_boolean(spriv, I915_PARAM_HAS_RELAXED_DELTA)) {
1017       fprintf(stderr, "[%s: %u] Kernel 2.6.39 required.\n", __func__, __LINE__);
1018       return false;
1019    }
1020
1021    return true;
1022 }
1023
1024 static __DRIconfig**
1025 intel_screen_make_configs(__DRIscreen *dri_screen)
1026 {
1027    static const mesa_format formats[] = {
1028       MESA_FORMAT_B5G6R5_UNORM,
1029       MESA_FORMAT_B8G8R8A8_UNORM,
1030       MESA_FORMAT_B8G8R8X8_UNORM
1031    };
1032
1033    /* __DRI_ATTRIB_SWAP_COPY is not supported due to page flipping. */
1034    static const GLenum back_buffer_modes[] = {
1035       __DRI_ATTRIB_SWAP_UNDEFINED, __DRI_ATTRIB_SWAP_NONE
1036    };
1037
1038    static const uint8_t singlesample_samples[1] = {0};
1039
1040    uint8_t depth_bits[4], stencil_bits[4];
1041    __DRIconfig **configs = NULL;
1042
1043    /* Generate singlesample configs without accumulation buffer. */
1044    for (int i = 0; i < ARRAY_SIZE(formats); i++) {
1045       __DRIconfig **new_configs;
1046       int num_depth_stencil_bits = 2;
1047
1048       /* Starting with DRI2 protocol version 1.1 we can request a depth/stencil
1049        * buffer that has a different number of bits per pixel than the color
1050        * buffer.
1051        */
1052       depth_bits[0] = 0;
1053       stencil_bits[0] = 0;
1054
1055       if (formats[i] == MESA_FORMAT_B5G6R5_UNORM) {
1056          depth_bits[1] = 16;
1057          stencil_bits[1] = 0;
1058       } else {
1059          depth_bits[1] = 24;
1060          stencil_bits[1] = 8;
1061       }
1062
1063       new_configs = driCreateConfigs(formats[i],
1064                                      depth_bits,
1065                                      stencil_bits,
1066                                      num_depth_stencil_bits,
1067                                      back_buffer_modes, 2,
1068                                      singlesample_samples, 1,
1069                                      false, false, false);
1070       configs = driConcatConfigs(configs, new_configs);
1071    }
1072
1073    /* Generate the minimum possible set of configs that include an
1074     * accumulation buffer.
1075     */
1076    for (int i = 0; i < ARRAY_SIZE(formats); i++) {
1077       __DRIconfig **new_configs;
1078
1079       if (formats[i] == MESA_FORMAT_B5G6R5_UNORM) {
1080          depth_bits[0] = 16;
1081          stencil_bits[0] = 0;
1082       } else {
1083          depth_bits[0] = 24;
1084          stencil_bits[0] = 8;
1085       }
1086
1087       new_configs = driCreateConfigs(formats[i],
1088                                      depth_bits, stencil_bits, 1,
1089                                      back_buffer_modes, 1,
1090                                      singlesample_samples, 1,
1091                                      true, false, false);
1092       configs = driConcatConfigs(configs, new_configs);
1093    }
1094
1095    if (configs == NULL) {
1096       fprintf(stderr, "[%s:%u] Error creating FBConfig!\n", __func__,
1097               __LINE__);
1098       return NULL;
1099    }
1100
1101    return configs;
1102 }
1103
1104 static void
1105 set_max_gl_versions(struct intel_screen *screen)
1106 {
1107    __DRIscreen *psp = screen->driScrnPriv;
1108
1109    switch (screen->gen) {
1110    case 3: {
1111       bool has_fragment_shader = driQueryOptionb(&screen->optionCache, "fragment_shader");
1112       bool has_occlusion_query = driQueryOptionb(&screen->optionCache, "stub_occlusion_query");
1113
1114       psp->max_gl_core_version = 0;
1115       psp->max_gl_es1_version = 11;
1116       psp->max_gl_es2_version = 20;
1117
1118       if (has_fragment_shader && has_occlusion_query) {
1119          psp->max_gl_compat_version = 21;
1120       } else {
1121          psp->max_gl_compat_version = 14;
1122       }
1123       break;
1124    }
1125    case 2:
1126       psp->max_gl_core_version = 0;
1127       psp->max_gl_compat_version = 13;
1128       psp->max_gl_es1_version = 11;
1129       psp->max_gl_es2_version = 0;
1130       break;
1131    default:
1132       assert(!"unrecognized intel_screen::gen");
1133       break;
1134    }
1135 }
1136
1137 /**
1138  * This is the driver specific part of the createNewScreen entry point.
1139  * Called when using DRI2.
1140  *
1141  * \return the struct gl_config supported by this driver
1142  */
1143 static const
1144 __DRIconfig **intelInitScreen2(__DRIscreen *psp)
1145 {
1146    struct intel_screen *intelScreen;
1147
1148    if (psp->image.loader) {
1149    } else if (psp->dri2.loader->base.version <= 2 ||
1150        psp->dri2.loader->getBuffersWithFormat == NULL) {
1151       fprintf(stderr,
1152               "\nERROR!  DRI2 loader with getBuffersWithFormat() "
1153               "support required\n");
1154       return false;
1155    }
1156
1157    /* Allocate the private area */
1158    intelScreen = calloc(1, sizeof *intelScreen);
1159    if (!intelScreen) {
1160       fprintf(stderr, "\nERROR!  Allocating private area failed\n");
1161       return false;
1162    }
1163    /* parse information in __driConfigOptions */
1164    driParseOptionInfo(&intelScreen->optionCache, i915_config_options.xml);
1165
1166    intelScreen->driScrnPriv = psp;
1167    psp->driverPrivate = (void *) intelScreen;
1168
1169    if (!intel_init_bufmgr(intelScreen))
1170        return false;
1171
1172    intelScreen->deviceID = drm_intel_bufmgr_gem_get_devid(intelScreen->bufmgr);
1173
1174    if (IS_GEN3(intelScreen->deviceID)) {
1175       intelScreen->gen = 3;
1176    } else {
1177       intelScreen->gen = 2;
1178    }
1179
1180    set_max_gl_versions(intelScreen);
1181
1182    psp->extensions = intelScreenExtensions;
1183
1184    return (const __DRIconfig**) intel_screen_make_configs(psp);
1185 }
1186
1187 struct intel_buffer {
1188    __DRIbuffer base;
1189    struct intel_region *region;
1190 };
1191
1192 static __DRIbuffer *
1193 intelAllocateBuffer(__DRIscreen *screen,
1194                     unsigned attachment, unsigned format,
1195                     int width, int height)
1196 {
1197    struct intel_buffer *intelBuffer;
1198    struct intel_screen *intelScreen = screen->driverPrivate;
1199
1200    assert(attachment == __DRI_BUFFER_FRONT_LEFT ||
1201           attachment == __DRI_BUFFER_BACK_LEFT);
1202
1203    intelBuffer = calloc(1, sizeof *intelBuffer);
1204    if (intelBuffer == NULL)
1205       return NULL;
1206
1207    /* The front and back buffers are color buffers, which are X tiled. */
1208    intelBuffer->region = intel_region_alloc(intelScreen,
1209                                             I915_TILING_X,
1210                                             format / 8,
1211                                             width,
1212                                             height,
1213                                             true);
1214
1215    if (intelBuffer->region == NULL) {
1216            free(intelBuffer);
1217            return NULL;
1218    }
1219
1220    intel_region_flink(intelBuffer->region, &intelBuffer->base.name);
1221
1222    intelBuffer->base.attachment = attachment;
1223    intelBuffer->base.cpp = intelBuffer->region->cpp;
1224    intelBuffer->base.pitch = intelBuffer->region->pitch;
1225
1226    return &intelBuffer->base;
1227 }
1228
1229 static void
1230 intelReleaseBuffer(__DRIscreen *screen, __DRIbuffer *buffer)
1231 {
1232    struct intel_buffer *intelBuffer = (struct intel_buffer *) buffer;
1233
1234    intel_region_release(&intelBuffer->region);
1235    free(intelBuffer);
1236 }
1237
1238
1239 static const struct __DriverAPIRec i915_driver_api = {
1240    .InitScreen           = intelInitScreen2,
1241    .DestroyScreen        = intelDestroyScreen,
1242    .CreateContext        = intelCreateContext,
1243    .DestroyContext       = intelDestroyContext,
1244    .CreateBuffer         = intelCreateBuffer,
1245    .DestroyBuffer        = intelDestroyBuffer,
1246    .MakeCurrent          = intelMakeCurrent,
1247    .UnbindContext        = intelUnbindContext,
1248    .AllocateBuffer       = intelAllocateBuffer,
1249    .ReleaseBuffer        = intelReleaseBuffer
1250 };
1251
1252 static const struct __DRIDriverVtableExtensionRec i915_vtable = {
1253    .base = { __DRI_DRIVER_VTABLE, 1 },
1254    .vtable = &i915_driver_api,
1255 };
1256
1257 /* This is the table of extensions that the loader will dlsym() for. */
1258 static const __DRIextension *i915_driver_extensions[] = {
1259     &driCoreExtension.base,
1260     &driImageDriverExtension.base,
1261     &driDRI2Extension.base,
1262     &i915_vtable.base,
1263     &i915_config_options.base,
1264     NULL
1265 };
1266
1267 PUBLIC const __DRIextension **__driDriverGetExtensions_i915(void)
1268 {
1269    globalDriverAPI = &i915_driver_api;
1270
1271    return i915_driver_extensions;
1272 }