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
  37 #include "utils.h"
  38 #include "xmlpool.h"
  39
  40 PUBLIC const char __driConfigOptions[] =
  41    DRI_CONF_BEGIN
  42    DRI_CONF_SECTION_PERFORMANCE
  43       DRI_CONF_VBLANK_MODE(DRI_CONF_VBLANK_ALWAYS_SYNC)
  44       /* Options correspond to DRI_CONF_BO_REUSE_DISABLED,
  45        * DRI_CONF_BO_REUSE_ALL
  46        */
  47       DRI_CONF_OPT_BEGIN_V(bo_reuse, enum, 1, "0:1")
  48          DRI_CONF_DESC_BEGIN(en, "Buffer object reuse")
  49             DRI_CONF_ENUM(0, "Disable buffer object reuse")
  50             DRI_CONF_ENUM(1, "Enable reuse of all sizes of buffer objects")
  51          DRI_CONF_DESC_END
  52       DRI_CONF_OPT_END
  53
  54       DRI_CONF_OPT_BEGIN(texture_tiling, bool, true)
  55          DRI_CONF_DESC(en, "Enable texture tiling")
  56       DRI_CONF_OPT_END
  57
  58       DRI_CONF_OPT_BEGIN(early_z, bool, false)
  59          DRI_CONF_DESC(en, "Enable early Z in classic mode (unstable, 945-only).")
  60       DRI_CONF_OPT_END
  61
  62       DRI_CONF_OPT_BEGIN(fragment_shader, bool, true)
  63          DRI_CONF_DESC(en, "Enable limited ARB_fragment_shader support on 915/945.")
  64       DRI_CONF_OPT_END
  65
  66    DRI_CONF_SECTION_END
  67    DRI_CONF_SECTION_QUALITY
  68       DRI_CONF_FORCE_S3TC_ENABLE(false)
  69       DRI_CONF_ALLOW_LARGE_TEXTURES(2)
  70    DRI_CONF_SECTION_END
  71    DRI_CONF_SECTION_DEBUG
  72      DRI_CONF_NO_RAST(false)
  73      DRI_CONF_ALWAYS_FLUSH_BATCH(false)
  74      DRI_CONF_ALWAYS_FLUSH_CACHE(false)
  75
  76       DRI_CONF_OPT_BEGIN(stub_occlusion_query, bool, 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(shader_precompile, bool, false)
  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 const GLuint __driNConfigOptions = 12;
  87
  88 #include "intel_batchbuffer.h"
  89 #include "intel_buffers.h"
  90 #include "intel_bufmgr.h"
  91 #include "intel_chipset.h"
  92 #include "intel_fbo.h"
  93 #include "intel_mipmap_tree.h"
  94 #include "intel_screen.h"
  95 #include "intel_tex.h"
  96 #include "intel_regions.h"
  97
  98 #include "i915_drm.h"
  99
 100 #ifdef USE_NEW_INTERFACE
 101 static PFNGLXCREATECONTEXTMODES create_context_modes = NULL;
 102 #endif /*USE_NEW_INTERFACE */
 103
 104 static const __DRItexBufferExtension intelTexBufferExtension = {
 105     { __DRI_TEX_BUFFER, __DRI_TEX_BUFFER_VERSION },
 106    intelSetTexBuffer,
 107    intelSetTexBuffer2,
 108 };
 109
 110 static void
 111 intelDRI2Flush(__DRIdrawable *drawable)
 112 {
 113    GET_CURRENT_CONTEXT(ctx);
 114    struct intel_context *intel = intel_context(ctx);
 115
 116    if (intel->gen < 4)
 117       INTEL_FIREVERTICES(intel);
 118
 119    intel->need_throttle = true;
 120
 121    if (intel->batch.used)
 122       intel_batchbuffer_flush(intel);
 123 }
 124
 125 static const struct __DRI2flushExtensionRec intelFlushExtension = {
 126     { __DRI2_FLUSH, __DRI2_FLUSH_VERSION },
 127     intelDRI2Flush,
 128     dri2InvalidateDrawable,
 129 };
 130
 131 static __DRIimage *
 132 intel_create_image_from_name(__DRIscreen *screen,
 133                              int width, int height, int format,
 134                              int name, int pitch, void *loaderPrivate)
 135 {
 136     struct intel_screen *intelScreen = screen->driverPrivate;
 137     __DRIimage *image;
 138     int cpp;
 139
 140     image = CALLOC(sizeof *image);
 141     if (image == NULL)
 142         return NULL;
 143
 144     switch (format) {
 145     case __DRI_IMAGE_FORMAT_RGB565:
 146        image->format = MESA_FORMAT_RGB565;
 147        image->internal_format = GL_RGB;
 148        image->data_type = GL_UNSIGNED_BYTE;
 149        break;
 150     case __DRI_IMAGE_FORMAT_XRGB8888:
 151        image->format = MESA_FORMAT_XRGB8888;
 152        image->internal_format = GL_RGB;
 153        image->data_type = GL_UNSIGNED_BYTE;
 154        break;
 155     case __DRI_IMAGE_FORMAT_ARGB8888:
 156        image->format = MESA_FORMAT_ARGB8888;
 157        image->internal_format = GL_RGBA;
 158        image->data_type = GL_UNSIGNED_BYTE;
 159        break;
 160     case __DRI_IMAGE_FORMAT_ABGR8888:
 161        image->format = MESA_FORMAT_RGBA8888_REV;
 162        image->internal_format = GL_RGBA;
 163        image->data_type = GL_UNSIGNED_BYTE;
 164        break;
 165     default:
 166        free(image);
 167        return NULL;
 168     }
 169
 170     image->data = loaderPrivate;
 171     cpp = _mesa_get_format_bytes(image->format);
 172
 173     image->region = intel_region_alloc_for_handle(intelScreen,
 174                                                   cpp, width, height,
 175                                                   pitch, name, "image");
 176     if (image->region == NULL) {
 177        FREE(image);
 178        return NULL;
 179     }
 180
 181     return image;
 182 }
 183
 184 static __DRIimage *
 185 intel_create_image_from_renderbuffer(__DRIcontext *context,
 186                                      int renderbuffer, void *loaderPrivate)
 187 {
 188    __DRIimage *image;
 189    struct intel_context *intel = context->driverPrivate;
 190    struct gl_renderbuffer *rb;
 191    struct intel_renderbuffer *irb;
 192
 193    rb = _mesa_lookup_renderbuffer(&intel->ctx, renderbuffer);
 194    if (!rb) {
 195       _mesa_error(&intel->ctx,
 196                   GL_INVALID_OPERATION, "glRenderbufferExternalMESA");
 197       return NULL;
 198    }
 199
 200    irb = intel_renderbuffer(rb);
 201    image = CALLOC(sizeof *image);
 202    if (image == NULL)
 203       return NULL;
 204
 205    image->internal_format = rb->InternalFormat;
 206    image->format = rb->Format;
 207    image->data_type = rb->DataType;
 208    image->data = loaderPrivate;
 209    intel_region_reference(&image->region, irb->mt->region);
 210
 211    return image;
 212 }
 213
 214 static void
 215 intel_destroy_image(__DRIimage *image)
 216 {
 217     intel_region_release(&image->region);
 218     FREE(image);
 219 }
 220
 221 static __DRIimage *
 222 intel_create_image(__DRIscreen *screen,
 223                    int width, int height, int format,
 224                    unsigned int use,
 225                    void *loaderPrivate)
 226 {
 227    __DRIimage *image;
 228    struct intel_screen *intelScreen = screen->driverPrivate;
 229    uint32_t tiling;
 230    int cpp;
 231
 232    tiling = I915_TILING_X;
 233    if (use & __DRI_IMAGE_USE_CURSOR) {
 234       if (width != 64 || height != 64)
 235          return NULL;
 236       tiling = I915_TILING_NONE;
 237    }
 238
 239    image = CALLOC(sizeof *image);
 240    if (image == NULL)
 241       return NULL;
 242
 243    switch (format) {
 244    case __DRI_IMAGE_FORMAT_RGB565:
 245       image->format = MESA_FORMAT_RGB565;
 246       image->internal_format = GL_RGB;
 247       image->data_type = GL_UNSIGNED_BYTE;
 248       break;
 249    case __DRI_IMAGE_FORMAT_XRGB8888:
 250       image->format = MESA_FORMAT_XRGB8888;
 251       image->internal_format = GL_RGB;
 252       image->data_type = GL_UNSIGNED_BYTE;
 253       break;
 254    case __DRI_IMAGE_FORMAT_ARGB8888:
 255       image->format = MESA_FORMAT_ARGB8888;
 256       image->internal_format = GL_RGBA;
 257       image->data_type = GL_UNSIGNED_BYTE;
 258       break;
 259     case __DRI_IMAGE_FORMAT_ABGR8888:
 260        image->format = MESA_FORMAT_RGBA8888_REV;
 261        image->internal_format = GL_RGBA;
 262        image->data_type = GL_UNSIGNED_BYTE;
 263        break;
 264    default:
 265       free(image);
 266       return NULL;
 267    }
 268
 269    image->data = loaderPrivate;
 270    cpp = _mesa_get_format_bytes(image->format);
 271
 272    image->region =
 273       intel_region_alloc(intelScreen, tiling,
 274                          cpp, width, height, true);
 275    if (image->region == NULL) {
 276       FREE(image);
 277       return NULL;
 278    }
 279
 280    return image;
 281 }
 282
 283 static GLboolean
 284 intel_query_image(__DRIimage *image, int attrib, int *value)
 285 {
 286    switch (attrib) {
 287    case __DRI_IMAGE_ATTRIB_STRIDE:
 288       *value = image->region->pitch * image->region->cpp;
 289       return true;
 290    case __DRI_IMAGE_ATTRIB_HANDLE:
 291       *value = image->region->bo->handle;
 292       return true;
 293    case __DRI_IMAGE_ATTRIB_NAME:
 294       return intel_region_flink(image->region, (uint32_t *) value);
 295    default:
 296       return false;
 297    }
 298 }
 299
 300 static __DRIimage *
 301 intel_dup_image(__DRIimage *orig_image, void *loaderPrivate)
 302 {
 303    __DRIimage *image;
 304
 305    image = CALLOC(sizeof *image);
 306    if (image == NULL)
 307       return NULL;
 308
 309    intel_region_reference(&image->region, orig_image->region);
 310    if (image->region == NULL) {
 311       FREE(image);
 312       return NULL;
 313    }
 314
 315    image->internal_format = orig_image->internal_format;
 316    image->format          = orig_image->format;
 317    image->data_type       = orig_image->data_type;
 318    image->data            = loaderPrivate;
 319
 320    return image;
 321 }
 322
 323 static struct __DRIimageExtensionRec intelImageExtension = {
 324     { __DRI_IMAGE, __DRI_IMAGE_VERSION },
 325     intel_create_image_from_name,
 326     intel_create_image_from_renderbuffer,
 327     intel_destroy_image,
 328     intel_create_image,
 329     intel_query_image,
 330     intel_dup_image
 331 };
 332
 333 static const __DRIextension *intelScreenExtensions[] = {
 334     &intelTexBufferExtension.base,
 335     &intelFlushExtension.base,
 336     &intelImageExtension.base,
 337     &dri2ConfigQueryExtension.base,
 338     NULL
 339 };
 340
 341 static bool
 342 intel_get_param(__DRIscreen *psp, int param, int *value)
 343 {
 344    int ret;
 345    struct drm_i915_getparam gp;
 346
 347    gp.param = param;
 348    gp.value = value;
 349
 350    ret = drmCommandWriteRead(psp->fd, DRM_I915_GETPARAM, &gp, sizeof(gp));
 351    if (ret) {
 352       if (ret != -EINVAL)
 353          _mesa_warning(NULL, "drm_i915_getparam: %d", ret);
 354       return false;
 355    }
 356
 357    return true;
 358 }
 359
 360 static bool
 361 intel_get_boolean(__DRIscreen *psp, int param)
 362 {
 363    int value = 0;
 364    return intel_get_param(psp, param, &value) && value;
 365 }
 366
 367 static void
 368 nop_callback(GLuint key, void *data, void *userData)
 369 {
 370 }
 371
 372 static void
 373 intelDestroyScreen(__DRIscreen * sPriv)
 374 {
 375    struct intel_screen *intelScreen = sPriv->driverPrivate;
 376
 377    dri_bufmgr_destroy(intelScreen->bufmgr);
 378    driDestroyOptionInfo(&intelScreen->optionCache);
 379
 380    /* Some regions may still have references to them at this point, so
 381     * flush the hash table to prevent _mesa_DeleteHashTable() from
 382     * complaining about the hash not being empty; */
 383    _mesa_HashDeleteAll(intelScreen->named_regions, nop_callback, NULL);
 384    _mesa_DeleteHashTable(intelScreen->named_regions);
 385
 386    FREE(intelScreen);
 387    sPriv->driverPrivate = NULL;
 388 }
 389
 390
 391 /**
 392  * This is called when we need to set up GL rendering to a new X window.
 393  */
 394 static GLboolean
 395 intelCreateBuffer(__DRIscreen * driScrnPriv,
 396                   __DRIdrawable * driDrawPriv,
 397                   const struct gl_config * mesaVis, GLboolean isPixmap)
 398 {
 399    struct intel_renderbuffer *rb;
 400    struct intel_screen *screen = (struct intel_screen*) driScrnPriv->driverPrivate;
 401
 402    if (isPixmap) {
 403       return false;          /* not implemented */
 404    }
 405    else {
 406       gl_format rgbFormat;
 407
 408       struct gl_framebuffer *fb = CALLOC_STRUCT(gl_framebuffer);
 409
 410       if (!fb)
 411          return false;
 412
 413       _mesa_initialize_window_framebuffer(fb, mesaVis);
 414
 415       if (mesaVis->redBits == 5)
 416          rgbFormat = MESA_FORMAT_RGB565;
 417       else if (mesaVis->alphaBits == 0)
 418          rgbFormat = MESA_FORMAT_XRGB8888;
 419       else
 420          rgbFormat = MESA_FORMAT_ARGB8888;
 421
 422       /* setup the hardware-based renderbuffers */
 423       rb = intel_create_renderbuffer(rgbFormat);
 424       _mesa_add_renderbuffer(fb, BUFFER_FRONT_LEFT, &rb->Base);
 425
 426       if (mesaVis->doubleBufferMode) {
 427          rb = intel_create_renderbuffer(rgbFormat);
 428          _mesa_add_renderbuffer(fb, BUFFER_BACK_LEFT, &rb->Base);
 429       }
 430
 431       /*
 432        * Assert here that the gl_config has an expected depth/stencil bit
 433        * combination: one of d24/s8, d16/s0, d0/s0. (See intelInitScreen2(),
 434        * which constructs the advertised configs.)
 435        */
 436       if (mesaVis->depthBits == 24) {
 437          assert(mesaVis->stencilBits == 8);
 438
 439          if (screen->hw_has_separate_stencil
 440              && screen->dri2_has_hiz != INTEL_DRI2_HAS_HIZ_FALSE) {
 441             /*
 442              * Request a separate stencil buffer even if we do not yet know if
 443              * the screen supports it. (See comments for
 444              * enum intel_dri2_has_hiz).
 445              */
 446             rb = intel_create_renderbuffer(MESA_FORMAT_X8_Z24);
 447             _mesa_add_renderbuffer(fb, BUFFER_DEPTH, &rb->Base);
 448             rb = intel_create_renderbuffer(MESA_FORMAT_S8);
 449             _mesa_add_renderbuffer(fb, BUFFER_STENCIL, &rb->Base);
 450          } else {
 451             /*
 452              * Use combined depth/stencil. Note that the renderbuffer is
 453              * attached to two attachment points.
 454              */
 455             rb = intel_create_renderbuffer(MESA_FORMAT_S8_Z24);
 456             _mesa_add_renderbuffer(fb, BUFFER_DEPTH, &rb->Base);
 457             _mesa_add_renderbuffer(fb, BUFFER_STENCIL, &rb->Base);
 458          }
 459       }
 460       else if (mesaVis->depthBits == 16) {
 461          assert(mesaVis->stencilBits == 0);
 462          /* just 16-bit depth buffer, no hw stencil */
 463          struct intel_renderbuffer *depthRb
 464             = intel_create_renderbuffer(MESA_FORMAT_Z16);
 465          _mesa_add_renderbuffer(fb, BUFFER_DEPTH, &depthRb->Base);
 466       }
 467       else {
 468          assert(mesaVis->depthBits == 0);
 469          assert(mesaVis->stencilBits == 0);
 470       }
 471
 472       /* now add any/all software-based renderbuffers we may need */
 473       _mesa_add_soft_renderbuffers(fb,
 474                                    false, /* never sw color */
 475                                    false, /* never sw depth */
 476                                    false, /* never sw stencil */
 477                                    mesaVis->accumRedBits > 0,
 478                                    false, /* never sw alpha */
 479                                    false  /* never sw aux */ );
 480       driDrawPriv->driverPrivate = fb;
 481
 482       return true;
 483    }
 484 }
 485
 486 static void
 487 intelDestroyBuffer(__DRIdrawable * driDrawPriv)
 488 {
 489     struct gl_framebuffer *fb = driDrawPriv->driverPrivate;
 490
 491     _mesa_reference_framebuffer(&fb, NULL);
 492 }
 493
 494 /* There are probably better ways to do this, such as an
 495  * init-designated function to register chipids and createcontext
 496  * functions.
 497  */
 498 extern bool
 499 i830CreateContext(const struct gl_config *mesaVis,
 500                   __DRIcontext *driContextPriv,
 501                   void *sharedContextPrivate);
 502
 503 extern bool
 504 i915CreateContext(int api,
 505                   const struct gl_config *mesaVis,
 506                   __DRIcontext *driContextPriv,
 507                   void *sharedContextPrivate);
 508 extern bool
 509 brwCreateContext(int api,
 510                  const struct gl_config *mesaVis,
 511                  __DRIcontext *driContextPriv,
 512                  void *sharedContextPrivate);
 513
 514 static GLboolean
 515 intelCreateContext(gl_api api,
 516                    const struct gl_config * mesaVis,
 517                    __DRIcontext * driContextPriv,
 518                    void *sharedContextPrivate)
 519 {
 520    __DRIscreen *sPriv = driContextPriv->driScreenPriv;
 521    struct intel_screen *intelScreen = sPriv->driverPrivate;
 522
 523 #ifdef I915
 524    if (IS_9XX(intelScreen->deviceID)) {
 525       if (!IS_965(intelScreen->deviceID)) {
 526          return i915CreateContext(api, mesaVis, driContextPriv,
 527                                   sharedContextPrivate);
 528       }
 529    } else {
 530       intelScreen->no_vbo = true;
 531       return i830CreateContext(mesaVis, driContextPriv, sharedContextPrivate);
 532    }
 533 #else
 534    if (IS_965(intelScreen->deviceID))
 535       return brwCreateContext(api, mesaVis,
 536                               driContextPriv, sharedContextPrivate);
 537 #endif
 538    fprintf(stderr, "Unrecognized deviceID 0x%x\n", intelScreen->deviceID);
 539    return false;
 540 }
 541
 542 static bool
 543 intel_init_bufmgr(struct intel_screen *intelScreen)
 544 {
 545    __DRIscreen *spriv = intelScreen->driScrnPriv;
 546    int num_fences = 0;
 547
 548    intelScreen->no_hw = (getenv("INTEL_NO_HW") != NULL ||
 549                          getenv("INTEL_DEVID_OVERRIDE") != NULL);
 550
 551    intelScreen->bufmgr = intel_bufmgr_gem_init(spriv->fd, BATCH_SZ);
 552    if (intelScreen->bufmgr == NULL) {
 553       fprintf(stderr, "[%s:%u] Error initializing buffer manager.\n",
 554               __func__, __LINE__);
 555       return false;
 556    }
 557
 558    if (!intel_get_param(spriv, I915_PARAM_NUM_FENCES_AVAIL, &num_fences) ||
 559        num_fences == 0) {
 560       fprintf(stderr, "[%s: %u] Kernel 2.6.29 required.\n", __func__, __LINE__);
 561       return false;
 562    }
 563
 564    drm_intel_bufmgr_gem_enable_fenced_relocs(intelScreen->bufmgr);
 565
 566    intelScreen->named_regions = _mesa_NewHashTable();
 567
 568    intelScreen->relaxed_relocations = 0;
 569    intelScreen->relaxed_relocations |=
 570       intel_get_boolean(spriv, I915_PARAM_HAS_RELAXED_DELTA) << 0;
 571
 572    return true;
 573 }
 574
 575 /**
 576  * Override intel_screen.hw_has_hiz with environment variable INTEL_HIZ.
 577  *
 578  * Valid values for INTEL_HIZ are "0" and "1". If an invalid valid value is
 579  * encountered, a warning is emitted and INTEL_HIZ is ignored.
 580  */
 581 static void
 582 intel_override_hiz(struct intel_screen *intel)
 583 {
 584    const char *s = getenv("INTEL_HIZ");
 585    if (!s) {
 586       return;
 587    } else if (!strncmp("0", s, 2)) {
 588       intel->hw_has_hiz = false;
 589    } else if (!strncmp("1", s, 2)) {
 590       intel->hw_has_hiz = true;
 591    } else {
 592       fprintf(stderr,
 593               "warning: env variable INTEL_HIZ=\"%s\" has invalid value "
 594               "and is ignored", s);
 595    }
 596 }
 597
 598 /**
 599  * Override intel_screen.hw_has_separate_stencil with environment variable
 600  * INTEL_SEPARATE_STENCIL.
 601  *
 602  * Valid values for INTEL_SEPARATE_STENCIL are "0" and "1". If an invalid
 603  * valid value is encountered, a warning is emitted and INTEL_SEPARATE_STENCIL
 604  * is ignored.
 605  */
 606 static void
 607 intel_override_separate_stencil(struct intel_screen *screen)
 608 {
 609    const char *s = getenv("INTEL_SEPARATE_STENCIL");
 610    if (!s) {
 611       return;
 612    } else if (!strncmp("0", s, 2)) {
 613       screen->hw_has_separate_stencil = false;
 614    } else if (!strncmp("1", s, 2)) {
 615       screen->hw_has_separate_stencil = true;
 616    } else {
 617       fprintf(stderr,
 618               "warning: env variable INTEL_SEPARATE_STENCIL=\"%s\" has "
 619               "invalid value and is ignored", s);
 620    }
 621 }
 622
 623 /**
 624  * This is the driver specific part of the createNewScreen entry point.
 625  * Called when using DRI2.
 626  *
 627  * \return the struct gl_config supported by this driver
 628  */
 629 static const
 630 __DRIconfig **intelInitScreen2(__DRIscreen *psp)
 631 {
 632    struct intel_screen *intelScreen;
 633    GLenum fb_format[3];
 634    GLenum fb_type[3];
 635    unsigned int api_mask;
 636    char *devid_override;
 637
 638    static const GLenum back_buffer_modes[] = {
 639        GLX_NONE, GLX_SWAP_UNDEFINED_OML, GLX_SWAP_COPY_OML
 640    };
 641    uint8_t depth_bits[4], stencil_bits[4], msaa_samples_array[1];
 642    int color;
 643    __DRIconfig **configs = NULL;
 644
 645    /* Allocate the private area */
 646    intelScreen = CALLOC(sizeof *intelScreen);
 647    if (!intelScreen) {
 648       fprintf(stderr, "\nERROR!  Allocating private area failed\n");
 649       return false;
 650    }
 651    /* parse information in __driConfigOptions */
 652    driParseOptionInfo(&intelScreen->optionCache,
 653                       __driConfigOptions, __driNConfigOptions);
 654
 655    intelScreen->driScrnPriv = psp;
 656    psp->driverPrivate = (void *) intelScreen;
 657
 658    /* Determine chipset ID */
 659    if (!intel_get_param(psp, I915_PARAM_CHIPSET_ID,
 660                         &intelScreen->deviceID))
 661       return false;
 662
 663    /* Allow an override of the device ID for the purpose of making the
 664     * driver produce dumps for debugging of new chipset enablement.
 665     * This implies INTEL_NO_HW, to avoid programming your actual GPU
 666     * incorrectly.
 667     */
 668    devid_override = getenv("INTEL_DEVID_OVERRIDE");
 669    if (devid_override) {
 670       intelScreen->deviceID = strtod(devid_override, NULL);
 671    }
 672
 673    if (IS_GEN7(intelScreen->deviceID)) {
 674       intelScreen->gen = 7;
 675    } else if (IS_GEN6(intelScreen->deviceID)) {
 676       intelScreen->gen = 6;
 677    } else if (IS_GEN5(intelScreen->deviceID)) {
 678       intelScreen->gen = 5;
 679    } else if (IS_965(intelScreen->deviceID)) {
 680       intelScreen->gen = 4;
 681    } else if (IS_9XX(intelScreen->deviceID)) {
 682       intelScreen->gen = 3;
 683    } else {
 684       intelScreen->gen = 2;
 685    }
 686
 687    intelScreen->hw_has_separate_stencil = intelScreen->gen >= 6;
 688    intelScreen->hw_must_use_separate_stencil = intelScreen->gen >= 7;
 689    intelScreen->hw_has_hiz = intelScreen->gen == 6; /* Not yet for gen7. */
 690    intelScreen->dri2_has_hiz = INTEL_DRI2_HAS_HIZ_UNKNOWN;
 691
 692    intel_override_hiz(intelScreen);
 693    intel_override_separate_stencil(intelScreen);
 694
 695    api_mask = (1 << __DRI_API_OPENGL);
 696 #if FEATURE_ES1
 697    api_mask |= (1 << __DRI_API_GLES);
 698 #endif
 699 #if FEATURE_ES2
 700    api_mask |= (1 << __DRI_API_GLES2);
 701 #endif
 702
 703    if (IS_9XX(intelScreen->deviceID) || IS_965(intelScreen->deviceID))
 704       psp->api_mask = api_mask;
 705
 706    if (!intel_init_bufmgr(intelScreen))
 707        return false;
 708
 709    psp->extensions = intelScreenExtensions;
 710
 711    msaa_samples_array[0] = 0;
 712
 713    fb_format[0] = GL_RGB;
 714    fb_type[0] = GL_UNSIGNED_SHORT_5_6_5;
 715
 716    fb_format[1] = GL_BGR;
 717    fb_type[1] = GL_UNSIGNED_INT_8_8_8_8_REV;
 718
 719    fb_format[2] = GL_BGRA;
 720    fb_type[2] = GL_UNSIGNED_INT_8_8_8_8_REV;
 721
 722    depth_bits[0] = 0;
 723    stencil_bits[0] = 0;
 724
 725    /* Generate a rich set of useful configs that do not include an
 726     * accumulation buffer.
 727     */
 728    for (color = 0; color < ARRAY_SIZE(fb_format); color++) {
 729       __DRIconfig **new_configs;
 730       int depth_factor;
 731
 732       /* Starting with DRI2 protocol version 1.1 we can request a depth/stencil
 733        * buffer that has a diffferent number of bits per pixel than the color
 734        * buffer.  This isn't yet supported here.
 735        */
 736       if (fb_type[color] == GL_UNSIGNED_SHORT_5_6_5) {
 737          depth_bits[1] = 16;
 738          stencil_bits[1] = 0;
 739       } else {
 740          depth_bits[1] = 24;
 741          stencil_bits[1] = 8;
 742       }
 743
 744       depth_factor = 2;
 745
 746       new_configs = driCreateConfigs(fb_format[color], fb_type[color],
 747                                      depth_bits,
 748                                      stencil_bits,
 749                                      depth_factor,
 750                                      back_buffer_modes,
 751                                      ARRAY_SIZE(back_buffer_modes),
 752                                      msaa_samples_array,
 753                                      ARRAY_SIZE(msaa_samples_array),
 754                                      false);
 755       if (configs == NULL)
 756          configs = new_configs;
 757       else
 758          configs = driConcatConfigs(configs, new_configs);
 759    }
 760
 761    /* Generate the minimum possible set of configs that include an
 762     * accumulation buffer.
 763     */
 764    for (color = 0; color < ARRAY_SIZE(fb_format); color++) {
 765       __DRIconfig **new_configs;
 766
 767       if (fb_type[color] == GL_UNSIGNED_SHORT_5_6_5) {
 768          depth_bits[0] = 16;
 769          stencil_bits[0] = 0;
 770       } else {
 771          depth_bits[0] = 24;
 772          stencil_bits[0] = 8;
 773       }
 774
 775       new_configs = driCreateConfigs(fb_format[color], fb_type[color],
 776                                      depth_bits, stencil_bits, 1,
 777                                      back_buffer_modes + 1, 1,
 778                                      msaa_samples_array, 1,
 779                                      true);
 780       if (configs == NULL)
 781          configs = new_configs;
 782       else
 783          configs = driConcatConfigs(configs, new_configs);
 784    }
 785
 786    if (configs == NULL) {
 787       fprintf(stderr, "[%s:%u] Error creating FBConfig!\n", __func__,
 788               __LINE__);
 789       return NULL;
 790    }
 791
 792    return (const __DRIconfig **)configs;
 793 }
 794
 795 struct intel_buffer {
 796    __DRIbuffer base;
 797    struct intel_region *region;
 798 };
 799
 800 /**
 801  * \brief Get tiling format for a DRI buffer.
 802  *
 803  * \param attachment is the buffer's attachmet point, such as
 804  *        __DRI_BUFFER_DEPTH.
 805  * \param out_tiling is the returned tiling format for buffer.
 806  * \return false if attachment is unrecognized or is incompatible with screen.
 807  */
 808 static bool
 809 intel_get_dri_buffer_tiling(struct intel_screen *screen,
 810                             uint32_t attachment,
 811                             uint32_t *out_tiling)
 812 {
 813    if (screen->gen < 4) {
 814       *out_tiling = I915_TILING_X;
 815       return true;
 816    }
 817
 818    switch (attachment) {
 819    case __DRI_BUFFER_DEPTH:
 820    case __DRI_BUFFER_DEPTH_STENCIL:
 821    case __DRI_BUFFER_HIZ:
 822       *out_tiling = I915_TILING_Y;
 823       return true;
 824    case __DRI_BUFFER_ACCUM:
 825    case __DRI_BUFFER_FRONT_LEFT:
 826    case __DRI_BUFFER_FRONT_RIGHT:
 827    case __DRI_BUFFER_BACK_LEFT:
 828    case __DRI_BUFFER_BACK_RIGHT:
 829    case __DRI_BUFFER_FAKE_FRONT_LEFT:
 830    case __DRI_BUFFER_FAKE_FRONT_RIGHT:
 831       *out_tiling = I915_TILING_X;
 832       return true;
 833    case __DRI_BUFFER_STENCIL:
 834       /* The stencil buffer is W tiled. However, we request from the kernel
 835        * a non-tiled buffer because the GTT is incapable of W fencing.
 836        */
 837       *out_tiling = I915_TILING_NONE;
 838       return true;
 839    default:
 840       if(unlikely(INTEL_DEBUG & DEBUG_DRI)) {
 841          fprintf(stderr, "error: %s: unrecognized DRI buffer attachment 0x%x\n",
 842                  __FUNCTION__, attachment);
 843       }
 844        return false;
 845    }
 846 }
 847
 848 static __DRIbuffer *
 849 intelAllocateBuffer(__DRIscreen *screen,
 850                     unsigned attachment, unsigned format,
 851                     int width, int height)
 852 {
 853    struct intel_buffer *intelBuffer;
 854    struct intel_screen *intelScreen = screen->driverPrivate;
 855
 856    uint32_t tiling;
 857    uint32_t region_width;
 858    uint32_t region_height;
 859    uint32_t region_cpp;
 860
 861    bool ok = true;
 862
 863    ok = intel_get_dri_buffer_tiling(intelScreen, attachment, &tiling);
 864    if (!ok)
 865       return NULL;
 866
 867    intelBuffer = CALLOC(sizeof *intelBuffer);
 868    if (intelBuffer == NULL)
 869       return NULL;
 870
 871    if (attachment == __DRI_BUFFER_STENCIL) {
 872       /* The stencil buffer has quirky pitch requirements.  From Vol 2a,
 873        * 11.5.6.2.1 3DSTATE_STENCIL_BUFFER, field "Surface Pitch":
 874        *    The pitch must be set to 2x the value computed based on width, as
 875        *    the stencil buffer is stored with two rows interleaved.
 876        * To accomplish this, we resort to the nasty hack of doubling the
 877        * region's cpp and halving its height.
 878        */
 879       region_width = ALIGN(width, 64);
 880       region_height = ALIGN(ALIGN(height, 2) / 2, 64);
 881       region_cpp = format / 4;
 882    } else {
 883       region_width = width;
 884       region_height = height;
 885       region_cpp = format / 8;
 886    }
 887
 888    intelBuffer->region = intel_region_alloc(intelScreen,
 889                                             tiling,
 890                                             region_cpp,
 891                                             region_width,
 892                                             region_height,
 893                                             true);
 894
 895    if (intelBuffer->region == NULL) {
 896            FREE(intelBuffer);
 897            return NULL;
 898    }
 899
 900    intel_region_flink(intelBuffer->region, &intelBuffer->base.name);
 901
 902    intelBuffer->base.attachment = attachment;
 903    intelBuffer->base.cpp = intelBuffer->region->cpp;
 904    intelBuffer->base.pitch =
 905          intelBuffer->region->pitch * intelBuffer->region->cpp;
 906
 907    return &intelBuffer->base;
 908 }
 909
 910 static void
 911 intelReleaseBuffer(__DRIscreen *screen, __DRIbuffer *buffer)
 912 {
 913    struct intel_buffer *intelBuffer = (struct intel_buffer *) buffer;
 914
 915    intel_region_release(&intelBuffer->region);
 916    free(intelBuffer);
 917 }
 918
 919
 920 const struct __DriverAPIRec driDriverAPI = {
 921    .InitScreen           = intelInitScreen2,
 922    .DestroyScreen        = intelDestroyScreen,
 923    .CreateContext        = intelCreateContext,
 924    .DestroyContext       = intelDestroyContext,
 925    .CreateBuffer         = intelCreateBuffer,
 926    .DestroyBuffer        = intelDestroyBuffer,
 927    .MakeCurrent          = intelMakeCurrent,
 928    .UnbindContext        = intelUnbindContext,
 929    .AllocateBuffer       = intelAllocateBuffer,
 930    .ReleaseBuffer        = intelReleaseBuffer
 931 };
 932
 933 /* This is the table of extensions that the loader will dlsym() for. */
 934 PUBLIC const __DRIextension *__driDriverExtensions[] = {
 935     &driCoreExtension.base,
 936     &driDRI2Extension.base,
 937     NULL
 938 };