src/mesa/drivers/dri/intel/intel_screen.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 #include <errno.h>
  29 #include "main/glheader.h"
  30 #include "main/context.h"
  31 #include "main/framebuffer.h"
  32 #include "main/renderbuffer.h"
  33 #include "main/hash.h"
  34 #include "main/fbobject.h"
  35 #include "main/mfeatures.h"
  36 #include "main/version.h"
  37 #include "swrast/s_renderbuffer.h"
  38
  39 #include "utils.h"
  40 #include "xmlpool.h"
  41
  42 PUBLIC const char __driConfigOptions[] =
  43    DRI_CONF_BEGIN
  44    DRI_CONF_SECTION_PERFORMANCE
  45       DRI_CONF_VBLANK_MODE(DRI_CONF_VBLANK_ALWAYS_SYNC)
  46       /* Options correspond to DRI_CONF_BO_REUSE_DISABLED,
  47        * DRI_CONF_BO_REUSE_ALL
  48        */
  49       DRI_CONF_OPT_BEGIN_V(bo_reuse, enum, 1, "0:1")
  50          DRI_CONF_DESC_BEGIN(en, "Buffer object reuse")
  51             DRI_CONF_ENUM(0, "Disable buffer object reuse")
  52             DRI_CONF_ENUM(1, "Enable reuse of all sizes of buffer objects")
  53          DRI_CONF_DESC_END
  54       DRI_CONF_OPT_END
  55
  56       DRI_CONF_OPT_BEGIN(texture_tiling, bool, true)
  57          DRI_CONF_DESC(en, "Enable texture tiling")
  58       DRI_CONF_OPT_END
  59
  60       DRI_CONF_OPT_BEGIN(early_z, bool, false)
  61          DRI_CONF_DESC(en, "Enable early Z in classic mode (unstable, 945-only).")
  62       DRI_CONF_OPT_END
  63
  64       DRI_CONF_OPT_BEGIN(fragment_shader, bool, true)
  65          DRI_CONF_DESC(en, "Enable limited ARB_fragment_shader support on 915/945.")
  66       DRI_CONF_OPT_END
  67
  68    DRI_CONF_SECTION_END
  69    DRI_CONF_SECTION_QUALITY
  70       DRI_CONF_FORCE_S3TC_ENABLE(false)
  71       DRI_CONF_ALLOW_LARGE_TEXTURES(2)
  72    DRI_CONF_SECTION_END
  73    DRI_CONF_SECTION_DEBUG
  74      DRI_CONF_NO_RAST(false)
  75      DRI_CONF_ALWAYS_FLUSH_BATCH(false)
  76      DRI_CONF_ALWAYS_FLUSH_CACHE(false)
  77
  78       DRI_CONF_OPT_BEGIN(stub_occlusion_query, bool, false)
  79          DRI_CONF_DESC(en, "Enable stub ARB_occlusion_query support on 915/945.")
  80       DRI_CONF_OPT_END
  81
  82       DRI_CONF_OPT_BEGIN(shader_precompile, bool, false)
  83          DRI_CONF_DESC(en, "Perform code generation at shader link time.")
  84       DRI_CONF_OPT_END
  85    DRI_CONF_SECTION_END
  86 DRI_CONF_END;
  87
  88 const GLuint __driNConfigOptions = 12;
  89
  90 #include "intel_batchbuffer.h"
  91 #include "intel_buffers.h"
  92 #include "intel_bufmgr.h"
  93 #include "intel_chipset.h"
  94 #include "intel_fbo.h"
  95 #include "intel_mipmap_tree.h"
  96 #include "intel_screen.h"
  97 #include "intel_tex.h"
  98 #include "intel_regions.h"
  99
 100 #include "i915_drm.h"
 101
 102 #ifdef USE_NEW_INTERFACE
 103 static PFNGLXCREATECONTEXTMODES create_context_modes = NULL;
 104 #endif /*USE_NEW_INTERFACE */
 105
 106 static const __DRItexBufferExtension intelTexBufferExtension = {
 107     { __DRI_TEX_BUFFER, __DRI_TEX_BUFFER_VERSION },
 108    intelSetTexBuffer,
 109    intelSetTexBuffer2,
 110 };
 111
 112 static void
 113 intelDRI2Flush(__DRIdrawable *drawable)
 114 {
 115    GET_CURRENT_CONTEXT(ctx);
 116    struct intel_context *intel = intel_context(ctx);
 117
 118    if (intel->gen < 4)
 119       INTEL_FIREVERTICES(intel);
 120
 121    intel->need_throttle = true;
 122
 123    if (intel->batch.used)
 124       intel_batchbuffer_flush(intel);
 125 }
 126
 127 static const struct __DRI2flushExtensionRec intelFlushExtension = {
 128     { __DRI2_FLUSH, __DRI2_FLUSH_VERSION },
 129     intelDRI2Flush,
 130     dri2InvalidateDrawable,
 131 };
 132
 133 static __DRIimage *
 134 intel_create_image_from_name(__DRIscreen *screen,
 135                              int width, int height, int format,
 136                              int name, int pitch, void *loaderPrivate)
 137 {
 138     struct intel_screen *intelScreen = screen->driverPrivate;
 139     __DRIimage *image;
 140     int cpp;
 141
 142     image = CALLOC(sizeof *image);
 143     if (image == NULL)
 144         return NULL;
 145
 146     switch (format) {
 147     case __DRI_IMAGE_FORMAT_RGB565:
 148        image->format = MESA_FORMAT_RGB565;
 149        image->internal_format = GL_RGB;
 150        image->data_type = GL_UNSIGNED_BYTE;
 151        break;
 152     case __DRI_IMAGE_FORMAT_XRGB8888:
 153        image->format = MESA_FORMAT_XRGB8888;
 154        image->internal_format = GL_RGB;
 155        image->data_type = GL_UNSIGNED_BYTE;
 156        break;
 157     case __DRI_IMAGE_FORMAT_ARGB8888:
 158        image->format = MESA_FORMAT_ARGB8888;
 159        image->internal_format = GL_RGBA;
 160        image->data_type = GL_UNSIGNED_BYTE;
 161        break;
 162     case __DRI_IMAGE_FORMAT_ABGR8888:
 163        image->format = MESA_FORMAT_RGBA8888_REV;
 164        image->internal_format = GL_RGBA;
 165        image->data_type = GL_UNSIGNED_BYTE;
 166        break;
 167     default:
 168        free(image);
 169        return NULL;
 170     }
 171
 172     image->data = loaderPrivate;
 173     cpp = _mesa_get_format_bytes(image->format);
 174
 175     image->region = intel_region_alloc_for_handle(intelScreen,
 176                                                   cpp, width, height,
 177                                                   pitch, name, "image");
 178     if (image->region == NULL) {
 179        FREE(image);
 180        return NULL;
 181     }
 182
 183     return image;
 184 }
 185
 186 static __DRIimage *
 187 intel_create_image_from_renderbuffer(__DRIcontext *context,
 188                                      int renderbuffer, void *loaderPrivate)
 189 {
 190    __DRIimage *image;
 191    struct intel_context *intel = context->driverPrivate;
 192    struct gl_renderbuffer *rb;
 193    struct intel_renderbuffer *irb;
 194
 195    rb = _mesa_lookup_renderbuffer(&intel->ctx, renderbuffer);
 196    if (!rb) {
 197       _mesa_error(&intel->ctx,
 198                   GL_INVALID_OPERATION, "glRenderbufferExternalMESA");
 199       return NULL;
 200    }
 201
 202    irb = intel_renderbuffer(rb);
 203    image = CALLOC(sizeof *image);
 204    if (image == NULL)
 205       return NULL;
 206
 207    image->internal_format = rb->InternalFormat;
 208    image->format = rb->Format;
 209    image->data_type = rb->DataType;
 210    image->data = loaderPrivate;
 211    intel_region_reference(&image->region, irb->mt->region);
 212
 213    return image;
 214 }
 215
 216 static void
 217 intel_destroy_image(__DRIimage *image)
 218 {
 219     intel_region_release(&image->region);
 220     FREE(image);
 221 }
 222
 223 static __DRIimage *
 224 intel_create_image(__DRIscreen *screen,
 225                    int width, int height, int format,
 226                    unsigned int use,
 227                    void *loaderPrivate)
 228 {
 229    __DRIimage *image;
 230    struct intel_screen *intelScreen = screen->driverPrivate;
 231    uint32_t tiling;
 232    int cpp;
 233
 234    tiling = I915_TILING_X;
 235    if (use & __DRI_IMAGE_USE_CURSOR) {
 236       if (width != 64 || height != 64)
 237          return NULL;
 238       tiling = I915_TILING_NONE;
 239    }
 240
 241    image = CALLOC(sizeof *image);
 242    if (image == NULL)
 243       return NULL;
 244
 245    switch (format) {
 246    case __DRI_IMAGE_FORMAT_RGB565:
 247       image->format = MESA_FORMAT_RGB565;
 248       image->internal_format = GL_RGB;
 249       image->data_type = GL_UNSIGNED_BYTE;
 250       break;
 251    case __DRI_IMAGE_FORMAT_XRGB8888:
 252       image->format = MESA_FORMAT_XRGB8888;
 253       image->internal_format = GL_RGB;
 254       image->data_type = GL_UNSIGNED_BYTE;
 255       break;
 256    case __DRI_IMAGE_FORMAT_ARGB8888:
 257       image->format = MESA_FORMAT_ARGB8888;
 258       image->internal_format = GL_RGBA;
 259       image->data_type = GL_UNSIGNED_BYTE;
 260       break;
 261     case __DRI_IMAGE_FORMAT_ABGR8888:
 262        image->format = MESA_FORMAT_RGBA8888_REV;
 263        image->internal_format = GL_RGBA;
 264        image->data_type = GL_UNSIGNED_BYTE;
 265        break;
 266    default:
 267       free(image);
 268       return NULL;
 269    }
 270
 271    image->data = loaderPrivate;
 272    cpp = _mesa_get_format_bytes(image->format);
 273
 274    image->region =
 275       intel_region_alloc(intelScreen, tiling,
 276                          cpp, width, height, true);
 277    if (image->region == NULL) {
 278       FREE(image);
 279       return NULL;
 280    }
 281
 282    return image;
 283 }
 284
 285 static GLboolean
 286 intel_query_image(__DRIimage *image, int attrib, int *value)
 287 {
 288    switch (attrib) {
 289    case __DRI_IMAGE_ATTRIB_STRIDE:
 290       *value = image->region->pitch * image->region->cpp;
 291       return true;
 292    case __DRI_IMAGE_ATTRIB_HANDLE:
 293       *value = image->region->bo->handle;
 294       return true;
 295    case __DRI_IMAGE_ATTRIB_NAME:
 296       return intel_region_flink(image->region, (uint32_t *) value);
 297    default:
 298       return false;
 299    }
 300 }
 301
 302 static __DRIimage *
 303 intel_dup_image(__DRIimage *orig_image, void *loaderPrivate)
 304 {
 305    __DRIimage *image;
 306
 307    image = CALLOC(sizeof *image);
 308    if (image == NULL)
 309       return NULL;
 310
 311    intel_region_reference(&image->region, orig_image->region);
 312    if (image->region == NULL) {
 313       FREE(image);
 314       return NULL;
 315    }
 316
 317    image->internal_format = orig_image->internal_format;
 318    image->format          = orig_image->format;
 319    image->data_type       = orig_image->data_type;
 320    image->data            = loaderPrivate;
 321
 322    return image;
 323 }
 324
 325 static struct __DRIimageExtensionRec intelImageExtension = {
 326     { __DRI_IMAGE, __DRI_IMAGE_VERSION },
 327     intel_create_image_from_name,
 328     intel_create_image_from_renderbuffer,
 329     intel_destroy_image,
 330     intel_create_image,
 331     intel_query_image,
 332     intel_dup_image
 333 };
 334
 335 static const __DRIextension *intelScreenExtensions[] = {
 336     &intelTexBufferExtension.base,
 337     &intelFlushExtension.base,
 338     &intelImageExtension.base,
 339     &dri2ConfigQueryExtension.base,
 340     NULL
 341 };
 342
 343 static bool
 344 intel_get_param(__DRIscreen *psp, int param, int *value)
 345 {
 346    int ret;
 347    struct drm_i915_getparam gp;
 348
 349    gp.param = param;
 350    gp.value = value;
 351
 352    ret = drmCommandWriteRead(psp->fd, DRM_I915_GETPARAM, &gp, sizeof(gp));
 353    if (ret) {
 354       if (ret != -EINVAL)
 355          _mesa_warning(NULL, "drm_i915_getparam: %d", ret);
 356       return false;
 357    }
 358
 359    return true;
 360 }
 361
 362 static bool
 363 intel_get_boolean(__DRIscreen *psp, int param)
 364 {
 365    int value = 0;
 366    return intel_get_param(psp, param, &value) && value;
 367 }
 368
 369 static void
 370 nop_callback(GLuint key, void *data, void *userData)
 371 {
 372 }
 373
 374 static void
 375 intelDestroyScreen(__DRIscreen * sPriv)
 376 {
 377    struct intel_screen *intelScreen = sPriv->driverPrivate;
 378
 379    dri_bufmgr_destroy(intelScreen->bufmgr);
 380    driDestroyOptionInfo(&intelScreen->optionCache);
 381
 382    /* Some regions may still have references to them at this point, so
 383     * flush the hash table to prevent _mesa_DeleteHashTable() from
 384     * complaining about the hash not being empty; */
 385    _mesa_HashDeleteAll(intelScreen->named_regions, nop_callback, NULL);
 386    _mesa_DeleteHashTable(intelScreen->named_regions);
 387
 388    FREE(intelScreen);
 389    sPriv->driverPrivate = NULL;
 390 }
 391
 392
 393 /**
 394  * This is called when we need to set up GL rendering to a new X window.
 395  */
 396 static GLboolean
 397 intelCreateBuffer(__DRIscreen * driScrnPriv,
 398                   __DRIdrawable * driDrawPriv,
 399                   const struct gl_config * mesaVis, GLboolean isPixmap)
 400 {
 401    struct intel_renderbuffer *rb;
 402    struct intel_screen *screen = (struct intel_screen*) driScrnPriv->driverPrivate;
 403
 404    if (isPixmap) {
 405       return false;          /* not implemented */
 406    }
 407    else {
 408       gl_format rgbFormat;
 409
 410       struct gl_framebuffer *fb = CALLOC_STRUCT(gl_framebuffer);
 411
 412       if (!fb)
 413          return false;
 414
 415       _mesa_initialize_window_framebuffer(fb, mesaVis);
 416
 417       if (mesaVis->redBits == 5)
 418          rgbFormat = MESA_FORMAT_RGB565;
 419       else if (mesaVis->alphaBits == 0)
 420          rgbFormat = MESA_FORMAT_XRGB8888;
 421       else
 422          rgbFormat = MESA_FORMAT_ARGB8888;
 423
 424       /* setup the hardware-based renderbuffers */
 425       rb = intel_create_renderbuffer(rgbFormat);
 426       _mesa_add_renderbuffer(fb, BUFFER_FRONT_LEFT, &rb->Base);
 427
 428       if (mesaVis->doubleBufferMode) {
 429          rb = intel_create_renderbuffer(rgbFormat);
 430          _mesa_add_renderbuffer(fb, BUFFER_BACK_LEFT, &rb->Base);
 431       }
 432
 433       /*
 434        * Assert here that the gl_config has an expected depth/stencil bit
 435        * combination: one of d24/s8, d16/s0, d0/s0. (See intelInitScreen2(),
 436        * which constructs the advertised configs.)
 437        */
 438       if (mesaVis->depthBits == 24) {
 439          assert(mesaVis->stencilBits == 8);
 440
 441          if (screen->hw_has_separate_stencil
 442              && screen->dri2_has_hiz != INTEL_DRI2_HAS_HIZ_FALSE) {
 443             /*
 444              * Request a separate stencil buffer even if we do not yet know if
 445              * the screen supports it. (See comments for
 446              * enum intel_dri2_has_hiz).
 447              */
 448             rb = intel_create_renderbuffer(MESA_FORMAT_X8_Z24);
 449             _mesa_add_renderbuffer(fb, BUFFER_DEPTH, &rb->Base);
 450             rb = intel_create_renderbuffer(MESA_FORMAT_S8);
 451             _mesa_add_renderbuffer(fb, BUFFER_STENCIL, &rb->Base);
 452          } else {
 453             /*
 454              * Use combined depth/stencil. Note that the renderbuffer is
 455              * attached to two attachment points.
 456              */
 457             rb = intel_create_renderbuffer(MESA_FORMAT_S8_Z24);
 458             _mesa_add_renderbuffer(fb, BUFFER_DEPTH, &rb->Base);
 459             _mesa_add_renderbuffer(fb, BUFFER_STENCIL, &rb->Base);
 460          }
 461       }
 462       else if (mesaVis->depthBits == 16) {
 463          assert(mesaVis->stencilBits == 0);
 464          /* just 16-bit depth buffer, no hw stencil */
 465          struct intel_renderbuffer *depthRb
 466             = intel_create_renderbuffer(MESA_FORMAT_Z16);
 467          _mesa_add_renderbuffer(fb, BUFFER_DEPTH, &depthRb->Base);
 468       }
 469       else {
 470          assert(mesaVis->depthBits == 0);
 471          assert(mesaVis->stencilBits == 0);
 472       }
 473
 474       /* now add any/all software-based renderbuffers we may need */
 475       _swrast_add_soft_renderbuffers(fb,
 476                                      false, /* never sw color */
 477                                      false, /* never sw depth */
 478                                      false, /* never sw stencil */
 479                                      mesaVis->accumRedBits > 0,
 480                                      false, /* never sw alpha */
 481                                      false  /* never sw aux */ );
 482       driDrawPriv->driverPrivate = fb;
 483
 484       return true;
 485    }
 486 }
 487
 488 static void
 489 intelDestroyBuffer(__DRIdrawable * driDrawPriv)
 490 {
 491     struct gl_framebuffer *fb = driDrawPriv->driverPrivate;
 492
 493     _mesa_reference_framebuffer(&fb, NULL);
 494 }
 495
 496 /* There are probably better ways to do this, such as an
 497  * init-designated function to register chipids and createcontext
 498  * functions.
 499  */
 500 extern bool
 501 i830CreateContext(const struct gl_config *mesaVis,
 502                   __DRIcontext *driContextPriv,
 503                   void *sharedContextPrivate);
 504
 505 extern bool
 506 i915CreateContext(int api,
 507                   const struct gl_config *mesaVis,
 508                   __DRIcontext *driContextPriv,
 509                   void *sharedContextPrivate);
 510 extern bool
 511 brwCreateContext(int api,
 512                  const struct gl_config *mesaVis,
 513                  __DRIcontext *driContextPriv,
 514                  void *sharedContextPrivate);
 515
 516 static GLboolean
 517 intelCreateContext(gl_api api,
 518                    const struct gl_config * mesaVis,
 519                    __DRIcontext * driContextPriv,
 520                    unsigned major_version,
 521                    unsigned minor_version,
 522                    uint32_t flags,
 523                    unsigned *error,
 524                    void *sharedContextPrivate)
 525 {
 526    __DRIscreen *sPriv = driContextPriv->driScreenPriv;
 527    struct intel_screen *intelScreen = sPriv->driverPrivate;
 528    bool success = false;
 529
 530 #ifdef I915
 531    if (IS_9XX(intelScreen->deviceID)) {
 532       if (!IS_965(intelScreen->deviceID)) {
 533          success = i915CreateContext(api, mesaVis, driContextPriv,
 534                                      sharedContextPrivate);
 535       }
 536    } else {
 537       intelScreen->no_vbo = true;
 538       success = i830CreateContext(mesaVis, driContextPriv,
 539                                   sharedContextPrivate);
 540    }
 541 #else
 542    if (IS_965(intelScreen->deviceID))
 543       success = brwCreateContext(api, mesaVis,
 544                               driContextPriv,
 545                               sharedContextPrivate);
 546 #endif
 547
 548    if (success) {
 549       struct gl_context *ctx =
 550          (struct gl_context *) driContextPriv->driverPrivate;
 551
 552       _mesa_compute_version(ctx);
 553       if (ctx->VersionMajor > major_version
 554           || (ctx->VersionMajor == major_version
 555               && ctx->VersionMinor >= minor_version)) {
 556          *error = __DRI_CTX_ERROR_BAD_VERSION;
 557          return true;
 558       }
 559
 560       intelDestroyContext(driContextPriv);
 561    } else {
 562       *error = __DRI_CTX_ERROR_NO_MEMORY;
 563       fprintf(stderr, "Unrecognized deviceID 0x%x\n", intelScreen->deviceID);
 564    }
 565
 566    return false;
 567 }
 568
 569 static bool
 570 intel_init_bufmgr(struct intel_screen *intelScreen)
 571 {
 572    __DRIscreen *spriv = intelScreen->driScrnPriv;
 573    int num_fences = 0;
 574
 575    intelScreen->no_hw = (getenv("INTEL_NO_HW") != NULL ||
 576                          getenv("INTEL_DEVID_OVERRIDE") != NULL);
 577
 578    intelScreen->bufmgr = intel_bufmgr_gem_init(spriv->fd, BATCH_SZ);
 579    if (intelScreen->bufmgr == NULL) {
 580       fprintf(stderr, "[%s:%u] Error initializing buffer manager.\n",
 581               __func__, __LINE__);
 582       return false;
 583    }
 584
 585    if (!intel_get_param(spriv, I915_PARAM_NUM_FENCES_AVAIL, &num_fences) ||
 586        num_fences == 0) {
 587       fprintf(stderr, "[%s: %u] Kernel 2.6.29 required.\n", __func__, __LINE__);
 588       return false;
 589    }
 590
 591    drm_intel_bufmgr_gem_enable_fenced_relocs(intelScreen->bufmgr);
 592
 593    intelScreen->named_regions = _mesa_NewHashTable();
 594
 595    intelScreen->relaxed_relocations = 0;
 596    intelScreen->relaxed_relocations |=
 597       intel_get_boolean(spriv, I915_PARAM_HAS_RELAXED_DELTA) << 0;
 598
 599    return true;
 600 }
 601
 602 /**
 603  * Override intel_screen.hw_has_hiz with environment variable INTEL_HIZ.
 604  *
 605  * Valid values for INTEL_HIZ are "0" and "1". If an invalid valid value is
 606  * encountered, a warning is emitted and INTEL_HIZ is ignored.
 607  */
 608 static void
 609 intel_override_hiz(struct intel_screen *intel)
 610 {
 611    const char *s = getenv("INTEL_HIZ");
 612    if (!s) {
 613       return;
 614    } else if (!strncmp("0", s, 2)) {
 615       intel->hw_has_hiz = false;
 616    } else if (!strncmp("1", s, 2)) {
 617       intel->hw_has_hiz = true;
 618    } else {
 619       fprintf(stderr,
 620               "warning: env variable INTEL_HIZ=\"%s\" has invalid value "
 621               "and is ignored", s);
 622    }
 623 }
 624
 625 /**
 626  * Override intel_screen.hw_has_separate_stencil with environment variable
 627  * INTEL_SEPARATE_STENCIL.
 628  *
 629  * Valid values for INTEL_SEPARATE_STENCIL are "0" and "1". If an invalid
 630  * valid value is encountered, a warning is emitted and INTEL_SEPARATE_STENCIL
 631  * is ignored.
 632  */
 633 static void
 634 intel_override_separate_stencil(struct intel_screen *screen)
 635 {
 636    const char *s = getenv("INTEL_SEPARATE_STENCIL");
 637    if (!s) {
 638       return;
 639    } else if (!strncmp("0", s, 2)) {
 640       screen->hw_has_separate_stencil = false;
 641    } else if (!strncmp("1", s, 2)) {
 642       screen->hw_has_separate_stencil = true;
 643    } else {
 644       fprintf(stderr,
 645               "warning: env variable INTEL_SEPARATE_STENCIL=\"%s\" has "
 646               "invalid value and is ignored", s);
 647    }
 648 }
 649
 650 /**
 651  * This is the driver specific part of the createNewScreen entry point.
 652  * Called when using DRI2.
 653  *
 654  * \return the struct gl_config supported by this driver
 655  */
 656 static const
 657 __DRIconfig **intelInitScreen2(__DRIscreen *psp)
 658 {
 659    struct intel_screen *intelScreen;
 660    GLenum fb_format[3];
 661    GLenum fb_type[3];
 662    unsigned int api_mask;
 663    char *devid_override;
 664
 665    static const GLenum back_buffer_modes[] = {
 666        GLX_NONE, GLX_SWAP_UNDEFINED_OML, GLX_SWAP_COPY_OML
 667    };
 668    uint8_t depth_bits[4], stencil_bits[4], msaa_samples_array[1];
 669    int color;
 670    __DRIconfig **configs = NULL;
 671
 672    /* Allocate the private area */
 673    intelScreen = CALLOC(sizeof *intelScreen);
 674    if (!intelScreen) {
 675       fprintf(stderr, "\nERROR!  Allocating private area failed\n");
 676       return false;
 677    }
 678    /* parse information in __driConfigOptions */
 679    driParseOptionInfo(&intelScreen->optionCache,
 680                       __driConfigOptions, __driNConfigOptions);
 681
 682    intelScreen->driScrnPriv = psp;
 683    psp->driverPrivate = (void *) intelScreen;
 684
 685    /* Determine chipset ID */
 686    if (!intel_get_param(psp, I915_PARAM_CHIPSET_ID,
 687                         &intelScreen->deviceID))
 688       return false;
 689
 690    /* Allow an override of the device ID for the purpose of making the
 691     * driver produce dumps for debugging of new chipset enablement.
 692     * This implies INTEL_NO_HW, to avoid programming your actual GPU
 693     * incorrectly.
 694     */
 695    devid_override = getenv("INTEL_DEVID_OVERRIDE");
 696    if (devid_override) {
 697       intelScreen->deviceID = strtod(devid_override, NULL);
 698    }
 699
 700    intelScreen->kernel_has_gen7_sol_reset =
 701       intel_get_boolean(intelScreen->driScrnPriv,
 702                         I915_PARAM_HAS_GEN7_SOL_RESET);
 703
 704    if (IS_GEN7(intelScreen->deviceID)) {
 705       intelScreen->gen = 7;
 706    } else if (IS_GEN6(intelScreen->deviceID)) {
 707       intelScreen->gen = 6;
 708    } else if (IS_GEN5(intelScreen->deviceID)) {
 709       intelScreen->gen = 5;
 710    } else if (IS_965(intelScreen->deviceID)) {
 711       intelScreen->gen = 4;
 712    } else if (IS_9XX(intelScreen->deviceID)) {
 713       intelScreen->gen = 3;
 714    } else {
 715       intelScreen->gen = 2;
 716    }
 717
 718    intelScreen->hw_has_separate_stencil = intelScreen->gen >= 6;
 719    intelScreen->hw_must_use_separate_stencil = intelScreen->gen >= 7;
 720    intelScreen->hw_has_hiz = intelScreen->gen >= 6;
 721    intelScreen->dri2_has_hiz = INTEL_DRI2_HAS_HIZ_UNKNOWN;
 722
 723    intel_override_hiz(intelScreen);
 724    intel_override_separate_stencil(intelScreen);
 725
 726    api_mask = (1 << __DRI_API_OPENGL);
 727 #if FEATURE_ES1
 728    api_mask |= (1 << __DRI_API_GLES);
 729 #endif
 730 #if FEATURE_ES2
 731    api_mask |= (1 << __DRI_API_GLES2);
 732 #endif
 733
 734    if (IS_9XX(intelScreen->deviceID) || IS_965(intelScreen->deviceID))
 735       psp->api_mask = api_mask;
 736
 737    if (!intel_init_bufmgr(intelScreen))
 738        return false;
 739
 740    psp->extensions = intelScreenExtensions;
 741
 742    msaa_samples_array[0] = 0;
 743
 744    fb_format[0] = GL_RGB;
 745    fb_type[0] = GL_UNSIGNED_SHORT_5_6_5;
 746
 747    fb_format[1] = GL_BGR;
 748    fb_type[1] = GL_UNSIGNED_INT_8_8_8_8_REV;
 749
 750    fb_format[2] = GL_BGRA;
 751    fb_type[2] = GL_UNSIGNED_INT_8_8_8_8_REV;
 752
 753    depth_bits[0] = 0;
 754    stencil_bits[0] = 0;
 755
 756    /* Generate a rich set of useful configs that do not include an
 757     * accumulation buffer.
 758     */
 759    for (color = 0; color < ARRAY_SIZE(fb_format); color++) {
 760       __DRIconfig **new_configs;
 761       int depth_factor;
 762
 763       /* Starting with DRI2 protocol version 1.1 we can request a depth/stencil
 764        * buffer that has a diffferent number of bits per pixel than the color
 765        * buffer.  This isn't yet supported here.
 766        */
 767       if (fb_type[color] == GL_UNSIGNED_SHORT_5_6_5) {
 768          depth_bits[1] = 16;
 769          stencil_bits[1] = 0;
 770       } else {
 771          depth_bits[1] = 24;
 772          stencil_bits[1] = 8;
 773       }
 774
 775       depth_factor = 2;
 776
 777       new_configs = driCreateConfigs(fb_format[color], fb_type[color],
 778                                      depth_bits,
 779                                      stencil_bits,
 780                                      depth_factor,
 781                                      back_buffer_modes,
 782                                      ARRAY_SIZE(back_buffer_modes),
 783                                      msaa_samples_array,
 784                                      ARRAY_SIZE(msaa_samples_array),
 785                                      false);
 786       if (configs == NULL)
 787          configs = new_configs;
 788       else
 789          configs = driConcatConfigs(configs, new_configs);
 790    }
 791
 792    /* Generate the minimum possible set of configs that include an
 793     * accumulation buffer.
 794     */
 795    for (color = 0; color < ARRAY_SIZE(fb_format); color++) {
 796       __DRIconfig **new_configs;
 797
 798       if (fb_type[color] == GL_UNSIGNED_SHORT_5_6_5) {
 799          depth_bits[0] = 16;
 800          stencil_bits[0] = 0;
 801       } else {
 802          depth_bits[0] = 24;
 803          stencil_bits[0] = 8;
 804       }
 805
 806       new_configs = driCreateConfigs(fb_format[color], fb_type[color],
 807                                      depth_bits, stencil_bits, 1,
 808                                      back_buffer_modes + 1, 1,
 809                                      msaa_samples_array, 1,
 810                                      true);
 811       if (configs == NULL)
 812          configs = new_configs;
 813       else
 814          configs = driConcatConfigs(configs, new_configs);
 815    }
 816
 817    if (configs == NULL) {
 818       fprintf(stderr, "[%s:%u] Error creating FBConfig!\n", __func__,
 819               __LINE__);
 820       return NULL;
 821    }
 822
 823    return (const __DRIconfig **)configs;
 824 }
 825
 826 struct intel_buffer {
 827    __DRIbuffer base;
 828    struct intel_region *region;
 829 };
 830
 831 /**
 832  * \brief Get tiling format for a DRI buffer.
 833  *
 834  * \param attachment is the buffer's attachmet point, such as
 835  *        __DRI_BUFFER_DEPTH.
 836  * \param out_tiling is the returned tiling format for buffer.
 837  * \return false if attachment is unrecognized or is incompatible with screen.
 838  */
 839 static bool
 840 intel_get_dri_buffer_tiling(struct intel_screen *screen,
 841                             uint32_t attachment,
 842                             uint32_t *out_tiling)
 843 {
 844    if (screen->gen < 4) {
 845       *out_tiling = I915_TILING_X;
 846       return true;
 847    }
 848
 849    switch (attachment) {
 850    case __DRI_BUFFER_DEPTH:
 851    case __DRI_BUFFER_DEPTH_STENCIL:
 852    case __DRI_BUFFER_HIZ:
 853       *out_tiling = I915_TILING_Y;
 854       return true;
 855    case __DRI_BUFFER_ACCUM:
 856    case __DRI_BUFFER_FRONT_LEFT:
 857    case __DRI_BUFFER_FRONT_RIGHT:
 858    case __DRI_BUFFER_BACK_LEFT:
 859    case __DRI_BUFFER_BACK_RIGHT:
 860    case __DRI_BUFFER_FAKE_FRONT_LEFT:
 861    case __DRI_BUFFER_FAKE_FRONT_RIGHT:
 862       *out_tiling = I915_TILING_X;
 863       return true;
 864    case __DRI_BUFFER_STENCIL:
 865       /* The stencil buffer is W tiled. However, we request from the kernel
 866        * a non-tiled buffer because the GTT is incapable of W fencing.
 867        */
 868       *out_tiling = I915_TILING_NONE;
 869       return true;
 870    default:
 871       if(unlikely(INTEL_DEBUG & DEBUG_DRI)) {
 872          fprintf(stderr, "error: %s: unrecognized DRI buffer attachment 0x%x\n",
 873                  __FUNCTION__, attachment);
 874       }
 875        return false;
 876    }
 877 }
 878
 879 static __DRIbuffer *
 880 intelAllocateBuffer(__DRIscreen *screen,
 881                     unsigned attachment, unsigned format,
 882                     int width, int height)
 883 {
 884    struct intel_buffer *intelBuffer;
 885    struct intel_screen *intelScreen = screen->driverPrivate;
 886
 887    uint32_t tiling;
 888    uint32_t region_width;
 889    uint32_t region_height;
 890    uint32_t region_cpp;
 891
 892    bool ok = true;
 893
 894    ok = intel_get_dri_buffer_tiling(intelScreen, attachment, &tiling);
 895    if (!ok)
 896       return NULL;
 897
 898    intelBuffer = CALLOC(sizeof *intelBuffer);
 899    if (intelBuffer == NULL)
 900       return NULL;
 901
 902    if (attachment == __DRI_BUFFER_STENCIL) {
 903       /* The stencil buffer has quirky pitch requirements.  From Vol 2a,
 904        * 11.5.6.2.1 3DSTATE_STENCIL_BUFFER, field "Surface Pitch":
 905        *    The pitch must be set to 2x the value computed based on width, as
 906        *    the stencil buffer is stored with two rows interleaved.
 907        * To accomplish this, we resort to the nasty hack of doubling the
 908        * region's cpp and halving its height.
 909        */
 910       region_width = ALIGN(width, 64);
 911       region_height = ALIGN(ALIGN(height, 2) / 2, 64);
 912       region_cpp = format / 4;
 913    } else {
 914       region_width = width;
 915       region_height = height;
 916       region_cpp = format / 8;
 917    }
 918
 919    intelBuffer->region = intel_region_alloc(intelScreen,
 920                                             tiling,
 921                                             region_cpp,
 922                                             region_width,
 923                                             region_height,
 924                                             true);
 925
 926    if (intelBuffer->region == NULL) {
 927            FREE(intelBuffer);
 928            return NULL;
 929    }
 930
 931    intel_region_flink(intelBuffer->region, &intelBuffer->base.name);
 932
 933    intelBuffer->base.attachment = attachment;
 934    intelBuffer->base.cpp = intelBuffer->region->cpp;
 935    intelBuffer->base.pitch =
 936          intelBuffer->region->pitch * intelBuffer->region->cpp;
 937
 938    return &intelBuffer->base;
 939 }
 940
 941 static void
 942 intelReleaseBuffer(__DRIscreen *screen, __DRIbuffer *buffer)
 943 {
 944    struct intel_buffer *intelBuffer = (struct intel_buffer *) buffer;
 945
 946    intel_region_release(&intelBuffer->region);
 947    free(intelBuffer);
 948 }
 949
 950
 951 const struct __DriverAPIRec driDriverAPI = {
 952    .InitScreen           = intelInitScreen2,
 953    .DestroyScreen        = intelDestroyScreen,
 954    .CreateContext        = intelCreateContext,
 955    .DestroyContext       = intelDestroyContext,
 956    .CreateBuffer         = intelCreateBuffer,
 957    .DestroyBuffer        = intelDestroyBuffer,
 958    .MakeCurrent          = intelMakeCurrent,
 959    .UnbindContext        = intelUnbindContext,
 960    .AllocateBuffer       = intelAllocateBuffer,
 961    .ReleaseBuffer        = intelReleaseBuffer
 962 };
 963
 964 /* This is the table of extensions that the loader will dlsym() for. */
 965 PUBLIC const __DRIextension *__driDriverExtensions[] = {
 966     &driCoreExtension.base,
 967     &driDRI2Extension.base,
 968     NULL
 969 };