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    if (intel == NULL)
 118       return;
 119
 120    if (intel->gen < 4)
 121       INTEL_FIREVERTICES(intel);
 122
 123    intel->need_throttle = true;
 124
 125    if (intel->batch.used)
 126       intel_batchbuffer_flush(intel);
 127 }
 128
 129 static const struct __DRI2flushExtensionRec intelFlushExtension = {
 130     { __DRI2_FLUSH, __DRI2_FLUSH_VERSION },
 131     intelDRI2Flush,
 132     dri2InvalidateDrawable,
 133 };
 134
 135 static __DRIimage *
 136 intel_create_image_from_name(__DRIscreen *screen,
 137                              int width, int height, int format,
 138                              int name, int pitch, void *loaderPrivate)
 139 {
 140     struct intel_screen *intelScreen = screen->driverPrivate;
 141     __DRIimage *image;
 142     int cpp;
 143
 144     image = CALLOC(sizeof *image);
 145     if (image == NULL)
 146         return NULL;
 147
 148     switch (format) {
 149     case __DRI_IMAGE_FORMAT_RGB565:
 150        image->format = MESA_FORMAT_RGB565;
 151        image->internal_format = GL_RGB;
 152        image->data_type = GL_UNSIGNED_BYTE;
 153        break;
 154     case __DRI_IMAGE_FORMAT_XRGB8888:
 155        image->format = MESA_FORMAT_XRGB8888;
 156        image->internal_format = GL_RGB;
 157        image->data_type = GL_UNSIGNED_BYTE;
 158        break;
 159     case __DRI_IMAGE_FORMAT_ARGB8888:
 160        image->format = MESA_FORMAT_ARGB8888;
 161        image->internal_format = GL_RGBA;
 162        image->data_type = GL_UNSIGNED_BYTE;
 163        break;
 164     case __DRI_IMAGE_FORMAT_ABGR8888:
 165        image->format = MESA_FORMAT_RGBA8888_REV;
 166        image->internal_format = GL_RGBA;
 167        image->data_type = GL_UNSIGNED_BYTE;
 168        break;
 169     default:
 170        free(image);
 171        return NULL;
 172     }
 173
 174     image->data = loaderPrivate;
 175     cpp = _mesa_get_format_bytes(image->format);
 176
 177     image->region = intel_region_alloc_for_handle(intelScreen,
 178                                                   cpp, width, height,
 179                                                   pitch, name, "image");
 180     if (image->region == NULL) {
 181        FREE(image);
 182        return NULL;
 183     }
 184
 185     return image;
 186 }
 187
 188 static __DRIimage *
 189 intel_create_image_from_renderbuffer(__DRIcontext *context,
 190                                      int renderbuffer, void *loaderPrivate)
 191 {
 192    __DRIimage *image;
 193    struct intel_context *intel = context->driverPrivate;
 194    struct gl_renderbuffer *rb;
 195    struct intel_renderbuffer *irb;
 196
 197    rb = _mesa_lookup_renderbuffer(&intel->ctx, renderbuffer);
 198    if (!rb) {
 199       _mesa_error(&intel->ctx,
 200                   GL_INVALID_OPERATION, "glRenderbufferExternalMESA");
 201       return NULL;
 202    }
 203
 204    irb = intel_renderbuffer(rb);
 205    image = CALLOC(sizeof *image);
 206    if (image == NULL)
 207       return NULL;
 208
 209    image->internal_format = rb->InternalFormat;
 210    image->format = rb->Format;
 211    image->data_type = rb->DataType;
 212    image->data = loaderPrivate;
 213    intel_region_reference(&image->region, irb->mt->region);
 214
 215    return image;
 216 }
 217
 218 static void
 219 intel_destroy_image(__DRIimage *image)
 220 {
 221     intel_region_release(&image->region);
 222     FREE(image);
 223 }
 224
 225 static __DRIimage *
 226 intel_create_image(__DRIscreen *screen,
 227                    int width, int height, int format,
 228                    unsigned int use,
 229                    void *loaderPrivate)
 230 {
 231    __DRIimage *image;
 232    struct intel_screen *intelScreen = screen->driverPrivate;
 233    uint32_t tiling;
 234    int cpp;
 235
 236    tiling = I915_TILING_X;
 237    if (use & __DRI_IMAGE_USE_CURSOR) {
 238       if (width != 64 || height != 64)
 239          return NULL;
 240       tiling = I915_TILING_NONE;
 241    }
 242
 243    image = CALLOC(sizeof *image);
 244    if (image == NULL)
 245       return NULL;
 246
 247    switch (format) {
 248    case __DRI_IMAGE_FORMAT_RGB565:
 249       image->format = MESA_FORMAT_RGB565;
 250       image->internal_format = GL_RGB;
 251       image->data_type = GL_UNSIGNED_BYTE;
 252       break;
 253    case __DRI_IMAGE_FORMAT_XRGB8888:
 254       image->format = MESA_FORMAT_XRGB8888;
 255       image->internal_format = GL_RGB;
 256       image->data_type = GL_UNSIGNED_BYTE;
 257       break;
 258    case __DRI_IMAGE_FORMAT_ARGB8888:
 259       image->format = MESA_FORMAT_ARGB8888;
 260       image->internal_format = GL_RGBA;
 261       image->data_type = GL_UNSIGNED_BYTE;
 262       break;
 263     case __DRI_IMAGE_FORMAT_ABGR8888:
 264        image->format = MESA_FORMAT_RGBA8888_REV;
 265        image->internal_format = GL_RGBA;
 266        image->data_type = GL_UNSIGNED_BYTE;
 267        break;
 268    default:
 269       free(image);
 270       return NULL;
 271    }
 272
 273    image->data = loaderPrivate;
 274    cpp = _mesa_get_format_bytes(image->format);
 275
 276    image->region =
 277       intel_region_alloc(intelScreen, tiling,
 278                          cpp, width, height, true);
 279    if (image->region == NULL) {
 280       FREE(image);
 281       return NULL;
 282    }
 283
 284    return image;
 285 }
 286
 287 static GLboolean
 288 intel_query_image(__DRIimage *image, int attrib, int *value)
 289 {
 290    switch (attrib) {
 291    case __DRI_IMAGE_ATTRIB_STRIDE:
 292       *value = image->region->pitch * image->region->cpp;
 293       return true;
 294    case __DRI_IMAGE_ATTRIB_HANDLE:
 295       *value = image->region->bo->handle;
 296       return true;
 297    case __DRI_IMAGE_ATTRIB_NAME:
 298       return intel_region_flink(image->region, (uint32_t *) value);
 299    default:
 300       return false;
 301    }
 302 }
 303
 304 static __DRIimage *
 305 intel_dup_image(__DRIimage *orig_image, void *loaderPrivate)
 306 {
 307    __DRIimage *image;
 308
 309    image = CALLOC(sizeof *image);
 310    if (image == NULL)
 311       return NULL;
 312
 313    intel_region_reference(&image->region, orig_image->region);
 314    if (image->region == NULL) {
 315       FREE(image);
 316       return NULL;
 317    }
 318
 319    image->internal_format = orig_image->internal_format;
 320    image->format          = orig_image->format;
 321    image->data_type       = orig_image->data_type;
 322    image->data            = loaderPrivate;
 323
 324    return image;
 325 }
 326
 327 static struct __DRIimageExtensionRec intelImageExtension = {
 328     { __DRI_IMAGE, __DRI_IMAGE_VERSION },
 329     intel_create_image_from_name,
 330     intel_create_image_from_renderbuffer,
 331     intel_destroy_image,
 332     intel_create_image,
 333     intel_query_image,
 334     intel_dup_image
 335 };
 336
 337 static const __DRIextension *intelScreenExtensions[] = {
 338     &intelTexBufferExtension.base,
 339     &intelFlushExtension.base,
 340     &intelImageExtension.base,
 341     &dri2ConfigQueryExtension.base,
 342     NULL
 343 };
 344
 345 static bool
 346 intel_get_param(__DRIscreen *psp, int param, int *value)
 347 {
 348    int ret;
 349    struct drm_i915_getparam gp;
 350
 351    gp.param = param;
 352    gp.value = value;
 353
 354    ret = drmCommandWriteRead(psp->fd, DRM_I915_GETPARAM, &gp, sizeof(gp));
 355    if (ret) {
 356       if (ret != -EINVAL)
 357          _mesa_warning(NULL, "drm_i915_getparam: %d", ret);
 358       return false;
 359    }
 360
 361    return true;
 362 }
 363
 364 static bool
 365 intel_get_boolean(__DRIscreen *psp, int param)
 366 {
 367    int value = 0;
 368    return intel_get_param(psp, param, &value) && value;
 369 }
 370
 371 static void
 372 nop_callback(GLuint key, void *data, void *userData)
 373 {
 374 }
 375
 376 static void
 377 intelDestroyScreen(__DRIscreen * sPriv)
 378 {
 379    struct intel_screen *intelScreen = sPriv->driverPrivate;
 380
 381    dri_bufmgr_destroy(intelScreen->bufmgr);
 382    driDestroyOptionInfo(&intelScreen->optionCache);
 383
 384    /* Some regions may still have references to them at this point, so
 385     * flush the hash table to prevent _mesa_DeleteHashTable() from
 386     * complaining about the hash not being empty; */
 387    _mesa_HashDeleteAll(intelScreen->named_regions, nop_callback, NULL);
 388    _mesa_DeleteHashTable(intelScreen->named_regions);
 389
 390    FREE(intelScreen);
 391    sPriv->driverPrivate = NULL;
 392 }
 393
 394
 395 /**
 396  * This is called when we need to set up GL rendering to a new X window.
 397  */
 398 static GLboolean
 399 intelCreateBuffer(__DRIscreen * driScrnPriv,
 400                   __DRIdrawable * driDrawPriv,
 401                   const struct gl_config * mesaVis, GLboolean isPixmap)
 402 {
 403    struct intel_renderbuffer *rb;
 404    struct intel_screen *screen = (struct intel_screen*) driScrnPriv->driverPrivate;
 405
 406    if (isPixmap) {
 407       return false;          /* not implemented */
 408    }
 409    else {
 410       gl_format rgbFormat;
 411
 412       struct gl_framebuffer *fb = CALLOC_STRUCT(gl_framebuffer);
 413
 414       if (!fb)
 415          return false;
 416
 417       _mesa_initialize_window_framebuffer(fb, mesaVis);
 418
 419       if (mesaVis->redBits == 5)
 420          rgbFormat = MESA_FORMAT_RGB565;
 421       else if (mesaVis->alphaBits == 0)
 422          rgbFormat = MESA_FORMAT_XRGB8888;
 423       else
 424          rgbFormat = MESA_FORMAT_ARGB8888;
 425
 426       /* setup the hardware-based renderbuffers */
 427       rb = intel_create_renderbuffer(rgbFormat);
 428       _mesa_add_renderbuffer(fb, BUFFER_FRONT_LEFT, &rb->Base);
 429
 430       if (mesaVis->doubleBufferMode) {
 431          rb = intel_create_renderbuffer(rgbFormat);
 432          _mesa_add_renderbuffer(fb, BUFFER_BACK_LEFT, &rb->Base);
 433       }
 434
 435       /*
 436        * Assert here that the gl_config has an expected depth/stencil bit
 437        * combination: one of d24/s8, d16/s0, d0/s0. (See intelInitScreen2(),
 438        * which constructs the advertised configs.)
 439        */
 440       if (mesaVis->depthBits == 24) {
 441          assert(mesaVis->stencilBits == 8);
 442
 443          if (screen->hw_has_separate_stencil
 444              && screen->dri2_has_hiz != INTEL_DRI2_HAS_HIZ_FALSE) {
 445             /*
 446              * Request a separate stencil buffer even if we do not yet know if
 447              * the screen supports it. (See comments for
 448              * enum intel_dri2_has_hiz).
 449              */
 450             rb = intel_create_renderbuffer(MESA_FORMAT_X8_Z24);
 451             _mesa_add_renderbuffer(fb, BUFFER_DEPTH, &rb->Base);
 452             rb = intel_create_renderbuffer(MESA_FORMAT_S8);
 453             _mesa_add_renderbuffer(fb, BUFFER_STENCIL, &rb->Base);
 454          } else {
 455             /*
 456              * Use combined depth/stencil. Note that the renderbuffer is
 457              * attached to two attachment points.
 458              */
 459             rb = intel_create_renderbuffer(MESA_FORMAT_S8_Z24);
 460             _mesa_add_renderbuffer(fb, BUFFER_DEPTH, &rb->Base);
 461             _mesa_add_renderbuffer(fb, BUFFER_STENCIL, &rb->Base);
 462          }
 463       }
 464       else if (mesaVis->depthBits == 16) {
 465          assert(mesaVis->stencilBits == 0);
 466          /* just 16-bit depth buffer, no hw stencil */
 467          struct intel_renderbuffer *depthRb
 468             = intel_create_renderbuffer(MESA_FORMAT_Z16);
 469          _mesa_add_renderbuffer(fb, BUFFER_DEPTH, &depthRb->Base);
 470       }
 471       else {
 472          assert(mesaVis->depthBits == 0);
 473          assert(mesaVis->stencilBits == 0);
 474       }
 475
 476       /* now add any/all software-based renderbuffers we may need */
 477       _swrast_add_soft_renderbuffers(fb,
 478                                      false, /* never sw color */
 479                                      false, /* never sw depth */
 480                                      false, /* never sw stencil */
 481                                      mesaVis->accumRedBits > 0,
 482                                      false, /* never sw alpha */
 483                                      false  /* never sw aux */ );
 484       driDrawPriv->driverPrivate = fb;
 485
 486       return true;
 487    }
 488 }
 489
 490 static void
 491 intelDestroyBuffer(__DRIdrawable * driDrawPriv)
 492 {
 493     struct gl_framebuffer *fb = driDrawPriv->driverPrivate;
 494
 495     _mesa_reference_framebuffer(&fb, NULL);
 496 }
 497
 498 /* There are probably better ways to do this, such as an
 499  * init-designated function to register chipids and createcontext
 500  * functions.
 501  */
 502 extern bool
 503 i830CreateContext(const struct gl_config *mesaVis,
 504                   __DRIcontext *driContextPriv,
 505                   void *sharedContextPrivate);
 506
 507 extern bool
 508 i915CreateContext(int api,
 509                   const struct gl_config *mesaVis,
 510                   __DRIcontext *driContextPriv,
 511                   void *sharedContextPrivate);
 512 extern bool
 513 brwCreateContext(int api,
 514                  const struct gl_config *mesaVis,
 515                  __DRIcontext *driContextPriv,
 516                  void *sharedContextPrivate);
 517
 518 static GLboolean
 519 intelCreateContext(gl_api api,
 520                    const struct gl_config * mesaVis,
 521                    __DRIcontext * driContextPriv,
 522                    unsigned major_version,
 523                    unsigned minor_version,
 524                    uint32_t flags,
 525                    unsigned *error,
 526                    void *sharedContextPrivate)
 527 {
 528    __DRIscreen *sPriv = driContextPriv->driScreenPriv;
 529    struct intel_screen *intelScreen = sPriv->driverPrivate;
 530    bool success = false;
 531
 532 #ifdef I915
 533    if (IS_9XX(intelScreen->deviceID)) {
 534       if (!IS_965(intelScreen->deviceID)) {
 535          success = i915CreateContext(api, mesaVis, driContextPriv,
 536                                      sharedContextPrivate);
 537       }
 538    } else {
 539       intelScreen->no_vbo = true;
 540       success = i830CreateContext(mesaVis, driContextPriv,
 541                                   sharedContextPrivate);
 542    }
 543 #else
 544    if (IS_965(intelScreen->deviceID))
 545       success = brwCreateContext(api, mesaVis,
 546                               driContextPriv,
 547                               sharedContextPrivate);
 548 #endif
 549
 550    if (success) {
 551       struct gl_context *ctx =
 552          (struct gl_context *) driContextPriv->driverPrivate;
 553
 554       _mesa_compute_version(ctx);
 555       if (ctx->VersionMajor > major_version
 556           || (ctx->VersionMajor == major_version
 557               && ctx->VersionMinor >= minor_version)) {
 558          *error = __DRI_CTX_ERROR_BAD_VERSION;
 559          return true;
 560       }
 561
 562       intelDestroyContext(driContextPriv);
 563    } else {
 564       *error = __DRI_CTX_ERROR_NO_MEMORY;
 565       fprintf(stderr, "Unrecognized deviceID 0x%x\n", intelScreen->deviceID);
 566    }
 567
 568    return false;
 569 }
 570
 571 static bool
 572 intel_init_bufmgr(struct intel_screen *intelScreen)
 573 {
 574    __DRIscreen *spriv = intelScreen->driScrnPriv;
 575    int num_fences = 0;
 576
 577    intelScreen->no_hw = (getenv("INTEL_NO_HW") != NULL ||
 578                          getenv("INTEL_DEVID_OVERRIDE") != NULL);
 579
 580    intelScreen->bufmgr = intel_bufmgr_gem_init(spriv->fd, BATCH_SZ);
 581    if (intelScreen->bufmgr == NULL) {
 582       fprintf(stderr, "[%s:%u] Error initializing buffer manager.\n",
 583               __func__, __LINE__);
 584       return false;
 585    }
 586
 587    if (!intel_get_param(spriv, I915_PARAM_NUM_FENCES_AVAIL, &num_fences) ||
 588        num_fences == 0) {
 589       fprintf(stderr, "[%s: %u] Kernel 2.6.29 required.\n", __func__, __LINE__);
 590       return false;
 591    }
 592
 593    drm_intel_bufmgr_gem_enable_fenced_relocs(intelScreen->bufmgr);
 594
 595    intelScreen->named_regions = _mesa_NewHashTable();
 596
 597    intelScreen->relaxed_relocations = 0;
 598    intelScreen->relaxed_relocations |=
 599       intel_get_boolean(spriv, I915_PARAM_HAS_RELAXED_DELTA) << 0;
 600
 601    return true;
 602 }
 603
 604 /**
 605  * Override intel_screen.hw_has_hiz with environment variable INTEL_HIZ.
 606  *
 607  * Valid values for INTEL_HIZ are "0" and "1". If an invalid valid value is
 608  * encountered, a warning is emitted and INTEL_HIZ is ignored.
 609  */
 610 static void
 611 intel_override_hiz(struct intel_screen *intel)
 612 {
 613    const char *s = getenv("INTEL_HIZ");
 614    if (!s) {
 615       return;
 616    } else if (!strncmp("0", s, 2)) {
 617       intel->hw_has_hiz = false;
 618    } else if (!strncmp("1", s, 2)) {
 619       intel->hw_has_hiz = true;
 620    } else {
 621       fprintf(stderr,
 622               "warning: env variable INTEL_HIZ=\"%s\" has invalid value "
 623               "and is ignored", s);
 624    }
 625 }
 626
 627 /**
 628  * Override intel_screen.hw_has_separate_stencil with environment variable
 629  * INTEL_SEPARATE_STENCIL.
 630  *
 631  * Valid values for INTEL_SEPARATE_STENCIL are "0" and "1". If an invalid
 632  * valid value is encountered, a warning is emitted and INTEL_SEPARATE_STENCIL
 633  * is ignored.
 634  */
 635 static void
 636 intel_override_separate_stencil(struct intel_screen *screen)
 637 {
 638    const char *s = getenv("INTEL_SEPARATE_STENCIL");
 639    if (!s) {
 640       return;
 641    } else if (!strncmp("0", s, 2)) {
 642       screen->hw_has_separate_stencil = false;
 643    } else if (!strncmp("1", s, 2)) {
 644       screen->hw_has_separate_stencil = true;
 645    } else {
 646       fprintf(stderr,
 647               "warning: env variable INTEL_SEPARATE_STENCIL=\"%s\" has "
 648               "invalid value and is ignored", s);
 649    }
 650 }
 651
 652 /**
 653  * This is the driver specific part of the createNewScreen entry point.
 654  * Called when using DRI2.
 655  *
 656  * \return the struct gl_config supported by this driver
 657  */
 658 static const
 659 __DRIconfig **intelInitScreen2(__DRIscreen *psp)
 660 {
 661    struct intel_screen *intelScreen;
 662    GLenum fb_format[3];
 663    GLenum fb_type[3];
 664    unsigned int api_mask;
 665    char *devid_override;
 666
 667    static const GLenum back_buffer_modes[] = {
 668        GLX_NONE, GLX_SWAP_UNDEFINED_OML, GLX_SWAP_COPY_OML
 669    };
 670    uint8_t depth_bits[4], stencil_bits[4], msaa_samples_array[1];
 671    int color;
 672    __DRIconfig **configs = NULL;
 673
 674    /* Allocate the private area */
 675    intelScreen = CALLOC(sizeof *intelScreen);
 676    if (!intelScreen) {
 677       fprintf(stderr, "\nERROR!  Allocating private area failed\n");
 678       return false;
 679    }
 680    /* parse information in __driConfigOptions */
 681    driParseOptionInfo(&intelScreen->optionCache,
 682                       __driConfigOptions, __driNConfigOptions);
 683
 684    intelScreen->driScrnPriv = psp;
 685    psp->driverPrivate = (void *) intelScreen;
 686
 687    /* Determine chipset ID */
 688    if (!intel_get_param(psp, I915_PARAM_CHIPSET_ID,
 689                         &intelScreen->deviceID))
 690       return false;
 691
 692    /* Allow an override of the device ID for the purpose of making the
 693     * driver produce dumps for debugging of new chipset enablement.
 694     * This implies INTEL_NO_HW, to avoid programming your actual GPU
 695     * incorrectly.
 696     */
 697    devid_override = getenv("INTEL_DEVID_OVERRIDE");
 698    if (devid_override) {
 699       intelScreen->deviceID = strtod(devid_override, NULL);
 700    }
 701
 702    intelScreen->kernel_has_gen7_sol_reset =
 703       intel_get_boolean(intelScreen->driScrnPriv,
 704                         I915_PARAM_HAS_GEN7_SOL_RESET);
 705
 706    if (IS_GEN7(intelScreen->deviceID)) {
 707       intelScreen->gen = 7;
 708    } else if (IS_GEN6(intelScreen->deviceID)) {
 709       intelScreen->gen = 6;
 710    } else if (IS_GEN5(intelScreen->deviceID)) {
 711       intelScreen->gen = 5;
 712    } else if (IS_965(intelScreen->deviceID)) {
 713       intelScreen->gen = 4;
 714    } else if (IS_9XX(intelScreen->deviceID)) {
 715       intelScreen->gen = 3;
 716    } else {
 717       intelScreen->gen = 2;
 718    }
 719
 720    intelScreen->hw_has_separate_stencil = intelScreen->gen >= 6;
 721    intelScreen->hw_must_use_separate_stencil = intelScreen->gen >= 7;
 722    intelScreen->hw_has_hiz = intelScreen->gen >= 6;
 723    intelScreen->dri2_has_hiz = INTEL_DRI2_HAS_HIZ_UNKNOWN;
 724
 725    intel_override_hiz(intelScreen);
 726    intel_override_separate_stencil(intelScreen);
 727
 728    api_mask = (1 << __DRI_API_OPENGL);
 729 #if FEATURE_ES1
 730    api_mask |= (1 << __DRI_API_GLES);
 731 #endif
 732 #if FEATURE_ES2
 733    api_mask |= (1 << __DRI_API_GLES2);
 734 #endif
 735
 736    if (IS_9XX(intelScreen->deviceID) || IS_965(intelScreen->deviceID))
 737       psp->api_mask = api_mask;
 738
 739    if (!intel_init_bufmgr(intelScreen))
 740        return false;
 741
 742    psp->extensions = intelScreenExtensions;
 743
 744    msaa_samples_array[0] = 0;
 745
 746    fb_format[0] = GL_RGB;
 747    fb_type[0] = GL_UNSIGNED_SHORT_5_6_5;
 748
 749    fb_format[1] = GL_BGR;
 750    fb_type[1] = GL_UNSIGNED_INT_8_8_8_8_REV;
 751
 752    fb_format[2] = GL_BGRA;
 753    fb_type[2] = GL_UNSIGNED_INT_8_8_8_8_REV;
 754
 755    depth_bits[0] = 0;
 756    stencil_bits[0] = 0;
 757
 758    /* Generate a rich set of useful configs that do not include an
 759     * accumulation buffer.
 760     */
 761    for (color = 0; color < ARRAY_SIZE(fb_format); color++) {
 762       __DRIconfig **new_configs;
 763       int depth_factor;
 764
 765       /* Starting with DRI2 protocol version 1.1 we can request a depth/stencil
 766        * buffer that has a diffferent number of bits per pixel than the color
 767        * buffer.  This isn't yet supported here.
 768        */
 769       if (fb_type[color] == GL_UNSIGNED_SHORT_5_6_5) {
 770          depth_bits[1] = 16;
 771          stencil_bits[1] = 0;
 772       } else {
 773          depth_bits[1] = 24;
 774          stencil_bits[1] = 8;
 775       }
 776
 777       depth_factor = 2;
 778
 779       new_configs = driCreateConfigs(fb_format[color], fb_type[color],
 780                                      depth_bits,
 781                                      stencil_bits,
 782                                      depth_factor,
 783                                      back_buffer_modes,
 784                                      ARRAY_SIZE(back_buffer_modes),
 785                                      msaa_samples_array,
 786                                      ARRAY_SIZE(msaa_samples_array),
 787                                      false);
 788       if (configs == NULL)
 789          configs = new_configs;
 790       else
 791          configs = driConcatConfigs(configs, new_configs);
 792    }
 793
 794    /* Generate the minimum possible set of configs that include an
 795     * accumulation buffer.
 796     */
 797    for (color = 0; color < ARRAY_SIZE(fb_format); color++) {
 798       __DRIconfig **new_configs;
 799
 800       if (fb_type[color] == GL_UNSIGNED_SHORT_5_6_5) {
 801          depth_bits[0] = 16;
 802          stencil_bits[0] = 0;
 803       } else {
 804          depth_bits[0] = 24;
 805          stencil_bits[0] = 8;
 806       }
 807
 808       new_configs = driCreateConfigs(fb_format[color], fb_type[color],
 809                                      depth_bits, stencil_bits, 1,
 810                                      back_buffer_modes + 1, 1,
 811                                      msaa_samples_array, 1,
 812                                      true);
 813       if (configs == NULL)
 814          configs = new_configs;
 815       else
 816          configs = driConcatConfigs(configs, new_configs);
 817    }
 818
 819    if (configs == NULL) {
 820       fprintf(stderr, "[%s:%u] Error creating FBConfig!\n", __func__,
 821               __LINE__);
 822       return NULL;
 823    }
 824
 825    return (const __DRIconfig **)configs;
 826 }
 827
 828 struct intel_buffer {
 829    __DRIbuffer base;
 830    struct intel_region *region;
 831 };
 832
 833 /**
 834  * \brief Get tiling format for a DRI buffer.
 835  *
 836  * \param attachment is the buffer's attachmet point, such as
 837  *        __DRI_BUFFER_DEPTH.
 838  * \param out_tiling is the returned tiling format for buffer.
 839  * \return false if attachment is unrecognized or is incompatible with screen.
 840  */
 841 static bool
 842 intel_get_dri_buffer_tiling(struct intel_screen *screen,
 843                             uint32_t attachment,
 844                             uint32_t *out_tiling)
 845 {
 846    if (screen->gen < 4) {
 847       *out_tiling = I915_TILING_X;
 848       return true;
 849    }
 850
 851    switch (attachment) {
 852    case __DRI_BUFFER_DEPTH:
 853    case __DRI_BUFFER_DEPTH_STENCIL:
 854    case __DRI_BUFFER_HIZ:
 855       *out_tiling = I915_TILING_Y;
 856       return true;
 857    case __DRI_BUFFER_ACCUM:
 858    case __DRI_BUFFER_FRONT_LEFT:
 859    case __DRI_BUFFER_FRONT_RIGHT:
 860    case __DRI_BUFFER_BACK_LEFT:
 861    case __DRI_BUFFER_BACK_RIGHT:
 862    case __DRI_BUFFER_FAKE_FRONT_LEFT:
 863    case __DRI_BUFFER_FAKE_FRONT_RIGHT:
 864       *out_tiling = I915_TILING_X;
 865       return true;
 866    case __DRI_BUFFER_STENCIL:
 867       /* The stencil buffer is W tiled. However, we request from the kernel
 868        * a non-tiled buffer because the GTT is incapable of W fencing.
 869        */
 870       *out_tiling = I915_TILING_NONE;
 871       return true;
 872    default:
 873       if(unlikely(INTEL_DEBUG & DEBUG_DRI)) {
 874          fprintf(stderr, "error: %s: unrecognized DRI buffer attachment 0x%x\n",
 875                  __FUNCTION__, attachment);
 876       }
 877        return false;
 878    }
 879 }
 880
 881 static __DRIbuffer *
 882 intelAllocateBuffer(__DRIscreen *screen,
 883                     unsigned attachment, unsigned format,
 884                     int width, int height)
 885 {
 886    struct intel_buffer *intelBuffer;
 887    struct intel_screen *intelScreen = screen->driverPrivate;
 888
 889    uint32_t tiling;
 890    uint32_t region_width;
 891    uint32_t region_height;
 892    uint32_t region_cpp;
 893
 894    bool ok = true;
 895
 896    ok = intel_get_dri_buffer_tiling(intelScreen, attachment, &tiling);
 897    if (!ok)
 898       return NULL;
 899
 900    intelBuffer = CALLOC(sizeof *intelBuffer);
 901    if (intelBuffer == NULL)
 902       return NULL;
 903
 904    if (attachment == __DRI_BUFFER_STENCIL) {
 905       /* The stencil buffer has quirky pitch requirements.  From Vol 2a,
 906        * 11.5.6.2.1 3DSTATE_STENCIL_BUFFER, field "Surface Pitch":
 907        *    The pitch must be set to 2x the value computed based on width, as
 908        *    the stencil buffer is stored with two rows interleaved.
 909        * To accomplish this, we resort to the nasty hack of doubling the
 910        * region's cpp and halving its height.
 911        */
 912       region_width = ALIGN(width, 64);
 913       region_height = ALIGN(ALIGN(height, 2) / 2, 64);
 914       region_cpp = format / 4;
 915    } else {
 916       region_width = width;
 917       region_height = height;
 918       region_cpp = format / 8;
 919    }
 920
 921    intelBuffer->region = intel_region_alloc(intelScreen,
 922                                             tiling,
 923                                             region_cpp,
 924                                             region_width,
 925                                             region_height,
 926                                             true);
 927
 928    if (intelBuffer->region == NULL) {
 929            FREE(intelBuffer);
 930            return NULL;
 931    }
 932
 933    intel_region_flink(intelBuffer->region, &intelBuffer->base.name);
 934
 935    intelBuffer->base.attachment = attachment;
 936    intelBuffer->base.cpp = intelBuffer->region->cpp;
 937    intelBuffer->base.pitch =
 938          intelBuffer->region->pitch * intelBuffer->region->cpp;
 939
 940    return &intelBuffer->base;
 941 }
 942
 943 static void
 944 intelReleaseBuffer(__DRIscreen *screen, __DRIbuffer *buffer)
 945 {
 946    struct intel_buffer *intelBuffer = (struct intel_buffer *) buffer;
 947
 948    intel_region_release(&intelBuffer->region);
 949    free(intelBuffer);
 950 }
 951
 952
 953 const struct __DriverAPIRec driDriverAPI = {
 954    .InitScreen           = intelInitScreen2,
 955    .DestroyScreen        = intelDestroyScreen,
 956    .CreateContext        = intelCreateContext,
 957    .DestroyContext       = intelDestroyContext,
 958    .CreateBuffer         = intelCreateBuffer,
 959    .DestroyBuffer        = intelDestroyBuffer,
 960    .MakeCurrent          = intelMakeCurrent,
 961    .UnbindContext        = intelUnbindContext,
 962    .AllocateBuffer       = intelAllocateBuffer,
 963    .ReleaseBuffer        = intelReleaseBuffer
 964 };
 965
 966 /* This is the table of extensions that the loader will dlsym() for. */
 967 PUBLIC const __DRIextension *__driDriverExtensions[] = {
 968     &driCoreExtension.base,
 969     &driDRI2Extension.base,
 970     NULL
 971 };