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    DRI_CONF_SECTION_END
  80 DRI_CONF_END;
  81
  82 const GLuint __driNConfigOptions = 11;
  83
  84 #include "intel_batchbuffer.h"
  85 #include "intel_buffers.h"
  86 #include "intel_bufmgr.h"
  87 #include "intel_chipset.h"
  88 #include "intel_fbo.h"
  89 #include "intel_screen.h"
  90 #include "intel_tex.h"
  91 #include "intel_regions.h"
  92
  93 #include "i915_drm.h"
  94
  95 #ifdef USE_NEW_INTERFACE
  96 static PFNGLXCREATECONTEXTMODES create_context_modes = NULL;
  97 #endif /*USE_NEW_INTERFACE */
  98
  99 static const __DRItexBufferExtension intelTexBufferExtension = {
 100     { __DRI_TEX_BUFFER, __DRI_TEX_BUFFER_VERSION },
 101    intelSetTexBuffer,
 102    intelSetTexBuffer2,
 103 };
 104
 105 static void
 106 intelDRI2Flush(__DRIdrawable *drawable)
 107 {
 108    GET_CURRENT_CONTEXT(ctx);
 109    struct intel_context *intel = intel_context(ctx);
 110
 111    if (intel->gen < 4)
 112       INTEL_FIREVERTICES(intel);
 113
 114    intel->need_throttle = GL_TRUE;
 115
 116    if (intel->batch.used)
 117       intel_batchbuffer_flush(intel);
 118 }
 119
 120 static const struct __DRI2flushExtensionRec intelFlushExtension = {
 121     { __DRI2_FLUSH, __DRI2_FLUSH_VERSION },
 122     intelDRI2Flush,
 123     dri2InvalidateDrawable,
 124 };
 125
 126 static __DRIimage *
 127 intel_create_image_from_name(__DRIscreen *screen,
 128                              int width, int height, int format,
 129                              int name, int pitch, void *loaderPrivate)
 130 {
 131     struct intel_screen *intelScreen = screen->private;
 132     __DRIimage *image;
 133     int cpp;
 134
 135     image = CALLOC(sizeof *image);
 136     if (image == NULL)
 137         return NULL;
 138
 139     switch (format) {
 140     case __DRI_IMAGE_FORMAT_RGB565:
 141        image->format = MESA_FORMAT_RGB565;
 142        image->internal_format = GL_RGB;
 143        image->data_type = GL_UNSIGNED_BYTE;
 144        break;
 145     case __DRI_IMAGE_FORMAT_XRGB8888:
 146        image->format = MESA_FORMAT_XRGB8888;
 147        image->internal_format = GL_RGB;
 148        image->data_type = GL_UNSIGNED_BYTE;
 149        break;
 150     case __DRI_IMAGE_FORMAT_ARGB8888:
 151        image->format = MESA_FORMAT_ARGB8888;
 152        image->internal_format = GL_RGBA;
 153        image->data_type = GL_UNSIGNED_BYTE;
 154        break;
 155     default:
 156        free(image);
 157        return NULL;
 158     }
 159
 160     image->data = loaderPrivate;
 161     cpp = _mesa_get_format_bytes(image->format);
 162
 163     image->region = intel_region_alloc_for_handle(intelScreen,
 164                                                   cpp, width, height,
 165                                                   pitch, name, "image");
 166     if (image->region == NULL) {
 167        FREE(image);
 168        return NULL;
 169     }
 170
 171     return image;
 172 }
 173
 174 static __DRIimage *
 175 intel_create_image_from_renderbuffer(__DRIcontext *context,
 176                                      int renderbuffer, void *loaderPrivate)
 177 {
 178    __DRIimage *image;
 179    struct intel_context *intel = context->driverPrivate;
 180    struct gl_renderbuffer *rb;
 181    struct intel_renderbuffer *irb;
 182
 183    rb = _mesa_lookup_renderbuffer(&intel->ctx, renderbuffer);
 184    if (!rb) {
 185       _mesa_error(&intel->ctx,
 186                   GL_INVALID_OPERATION, "glRenderbufferExternalMESA");
 187       return NULL;
 188    }
 189
 190    irb = intel_renderbuffer(rb);
 191    image = CALLOC(sizeof *image);
 192    if (image == NULL)
 193       return NULL;
 194
 195    image->internal_format = rb->InternalFormat;
 196    image->format = rb->Format;
 197    image->data_type = rb->DataType;
 198    image->data = loaderPrivate;
 199    intel_region_reference(&image->region, irb->region);
 200
 201    return image;
 202 }
 203
 204 static void
 205 intel_destroy_image(__DRIimage *image)
 206 {
 207     intel_region_release(&image->region);
 208     FREE(image);
 209 }
 210
 211 static __DRIimage *
 212 intel_create_image(__DRIscreen *screen,
 213                    int width, int height, int format,
 214                    unsigned int use,
 215                    void *loaderPrivate)
 216 {
 217    __DRIimage *image;
 218    struct intel_screen *intelScreen = screen->private;
 219    int cpp;
 220
 221    image = CALLOC(sizeof *image);
 222    if (image == NULL)
 223       return NULL;
 224
 225    switch (format) {
 226    case __DRI_IMAGE_FORMAT_RGB565:
 227       image->format = MESA_FORMAT_RGB565;
 228       image->internal_format = GL_RGB;
 229       image->data_type = GL_UNSIGNED_BYTE;
 230       break;
 231    case __DRI_IMAGE_FORMAT_XRGB8888:
 232       image->format = MESA_FORMAT_XRGB8888;
 233       image->internal_format = GL_RGB;
 234       image->data_type = GL_UNSIGNED_BYTE;
 235       break;
 236    case __DRI_IMAGE_FORMAT_ARGB8888:
 237       image->format = MESA_FORMAT_ARGB8888;
 238       image->internal_format = GL_RGBA;
 239       image->data_type = GL_UNSIGNED_BYTE;
 240       break;
 241    default:
 242       free(image);
 243       return NULL;
 244    }
 245
 246    image->data = loaderPrivate;
 247    cpp = _mesa_get_format_bytes(image->format);
 248
 249    image->region =
 250       intel_region_alloc(intelScreen, I915_TILING_X,
 251                          cpp, width, height, GL_TRUE);
 252    if (image->region == NULL) {
 253       FREE(image);
 254       return NULL;
 255    }
 256
 257    return image;
 258 }
 259
 260 static GLboolean
 261 intel_query_image(__DRIimage *image, int attrib, int *value)
 262 {
 263    switch (attrib) {
 264    case __DRI_IMAGE_ATTRIB_STRIDE:
 265       *value = image->region->pitch * image->region->cpp;
 266       return GL_TRUE;
 267    case __DRI_IMAGE_ATTRIB_HANDLE:
 268       *value = image->region->buffer->handle;
 269       return GL_TRUE;
 270    case __DRI_IMAGE_ATTRIB_NAME:
 271       return intel_region_flink(image->region, (uint32_t *) value);
 272    default:
 273       return GL_FALSE;
 274    }
 275 }
 276
 277 static struct __DRIimageExtensionRec intelImageExtension = {
 278     { __DRI_IMAGE, __DRI_IMAGE_VERSION },
 279     intel_create_image_from_name,
 280     intel_create_image_from_renderbuffer,
 281     intel_destroy_image,
 282     intel_create_image,
 283     intel_query_image
 284 };
 285
 286 static const __DRIextension *intelScreenExtensions[] = {
 287     &driReadDrawableExtension,
 288     &intelTexBufferExtension.base,
 289     &intelFlushExtension.base,
 290     &intelImageExtension.base,
 291     &dri2ConfigQueryExtension.base,
 292     NULL
 293 };
 294
 295 static GLboolean
 296 intel_get_param(__DRIscreen *psp, int param, int *value)
 297 {
 298    int ret;
 299    struct drm_i915_getparam gp;
 300
 301    gp.param = param;
 302    gp.value = value;
 303
 304    ret = drmCommandWriteRead(psp->fd, DRM_I915_GETPARAM, &gp, sizeof(gp));
 305    if (ret) {
 306       if (ret != -EINVAL)
 307          _mesa_warning(NULL, "drm_i915_getparam: %d", ret);
 308       return GL_FALSE;
 309    }
 310
 311    return GL_TRUE;
 312 }
 313
 314 static GLboolean
 315 intel_get_boolean(__DRIscreen *psp, int param)
 316 {
 317    int value = 0;
 318    return intel_get_param(psp, param, &value) && value;
 319 }
 320
 321 static void
 322 nop_callback(GLuint key, void *data, void *userData)
 323 {
 324 }
 325
 326 static void
 327 intelDestroyScreen(__DRIscreen * sPriv)
 328 {
 329    struct intel_screen *intelScreen = sPriv->private;
 330
 331    dri_bufmgr_destroy(intelScreen->bufmgr);
 332    driDestroyOptionInfo(&intelScreen->optionCache);
 333
 334    /* Some regions may still have references to them at this point, so
 335     * flush the hash table to prevent _mesa_DeleteHashTable() from
 336     * complaining about the hash not being empty; */
 337    _mesa_HashDeleteAll(intelScreen->named_regions, nop_callback, NULL);
 338    _mesa_DeleteHashTable(intelScreen->named_regions);
 339
 340    FREE(intelScreen);
 341    sPriv->private = NULL;
 342 }
 343
 344
 345 /**
 346  * This is called when we need to set up GL rendering to a new X window.
 347  */
 348 static GLboolean
 349 intelCreateBuffer(__DRIscreen * driScrnPriv,
 350                   __DRIdrawable * driDrawPriv,
 351                   const struct gl_config * mesaVis, GLboolean isPixmap)
 352 {
 353    struct intel_renderbuffer *rb;
 354
 355    if (isPixmap) {
 356       return GL_FALSE;          /* not implemented */
 357    }
 358    else {
 359       GLboolean swStencil = (mesaVis->stencilBits > 0 &&
 360                              mesaVis->depthBits != 24);
 361       gl_format rgbFormat;
 362
 363       struct gl_framebuffer *fb = CALLOC_STRUCT(gl_framebuffer);
 364
 365       if (!fb)
 366          return GL_FALSE;
 367
 368       _mesa_initialize_window_framebuffer(fb, mesaVis);
 369
 370       if (mesaVis->redBits == 5)
 371          rgbFormat = MESA_FORMAT_RGB565;
 372       else if (mesaVis->alphaBits == 0)
 373          rgbFormat = MESA_FORMAT_XRGB8888;
 374       else
 375          rgbFormat = MESA_FORMAT_ARGB8888;
 376
 377       /* setup the hardware-based renderbuffers */
 378       rb = intel_create_renderbuffer(rgbFormat);
 379       _mesa_add_renderbuffer(fb, BUFFER_FRONT_LEFT, &rb->Base);
 380
 381       if (mesaVis->doubleBufferMode) {
 382          rb = intel_create_renderbuffer(rgbFormat);
 383          _mesa_add_renderbuffer(fb, BUFFER_BACK_LEFT, &rb->Base);
 384       }
 385
 386       if (mesaVis->depthBits == 24) {
 387          assert(mesaVis->stencilBits == 8);
 388          /* combined depth/stencil buffer */
 389          struct intel_renderbuffer *depthStencilRb
 390             = intel_create_renderbuffer(MESA_FORMAT_S8_Z24);
 391          /* note: bind RB to two attachment points */
 392          _mesa_add_renderbuffer(fb, BUFFER_DEPTH, &depthStencilRb->Base);
 393          _mesa_add_renderbuffer(fb, BUFFER_STENCIL, &depthStencilRb->Base);
 394       }
 395       else if (mesaVis->depthBits == 16) {
 396          /* just 16-bit depth buffer, no hw stencil */
 397          struct intel_renderbuffer *depthRb
 398             = intel_create_renderbuffer(MESA_FORMAT_Z16);
 399          _mesa_add_renderbuffer(fb, BUFFER_DEPTH, &depthRb->Base);
 400       }
 401
 402       /* now add any/all software-based renderbuffers we may need */
 403       _mesa_add_soft_renderbuffers(fb,
 404                                    GL_FALSE, /* never sw color */
 405                                    GL_FALSE, /* never sw depth */
 406                                    swStencil, mesaVis->accumRedBits > 0,
 407                                    GL_FALSE, /* never sw alpha */
 408                                    GL_FALSE  /* never sw aux */ );
 409       driDrawPriv->driverPrivate = fb;
 410
 411       return GL_TRUE;
 412    }
 413 }
 414
 415 static void
 416 intelDestroyBuffer(__DRIdrawable * driDrawPriv)
 417 {
 418     struct gl_framebuffer *fb = driDrawPriv->driverPrivate;
 419
 420     _mesa_reference_framebuffer(&fb, NULL);
 421 }
 422
 423 /* There are probably better ways to do this, such as an
 424  * init-designated function to register chipids and createcontext
 425  * functions.
 426  */
 427 extern GLboolean i830CreateContext(const struct gl_config * mesaVis,
 428                                    __DRIcontext * driContextPriv,
 429                                    void *sharedContextPrivate);
 430
 431 extern GLboolean i915CreateContext(int api,
 432                                    const struct gl_config * mesaVis,
 433                                    __DRIcontext * driContextPriv,
 434                                    void *sharedContextPrivate);
 435 extern GLboolean brwCreateContext(int api,
 436                                   const struct gl_config * mesaVis,
 437                                   __DRIcontext * driContextPriv,
 438                                   void *sharedContextPrivate);
 439
 440 static GLboolean
 441 intelCreateContext(gl_api api,
 442                    const struct gl_config * mesaVis,
 443                    __DRIcontext * driContextPriv,
 444                    void *sharedContextPrivate)
 445 {
 446    __DRIscreen *sPriv = driContextPriv->driScreenPriv;
 447    struct intel_screen *intelScreen = sPriv->private;
 448
 449 #ifdef I915
 450    if (IS_9XX(intelScreen->deviceID)) {
 451       if (!IS_965(intelScreen->deviceID)) {
 452          return i915CreateContext(api, mesaVis, driContextPriv,
 453                                   sharedContextPrivate);
 454       }
 455    } else {
 456       intelScreen->no_vbo = GL_TRUE;
 457       return i830CreateContext(mesaVis, driContextPriv, sharedContextPrivate);
 458    }
 459 #else
 460    if (IS_965(intelScreen->deviceID))
 461       return brwCreateContext(api, mesaVis,
 462                               driContextPriv, sharedContextPrivate);
 463 #endif
 464    fprintf(stderr, "Unrecognized deviceID 0x%x\n", intelScreen->deviceID);
 465    return GL_FALSE;
 466 }
 467
 468 static GLboolean
 469 intel_init_bufmgr(struct intel_screen *intelScreen)
 470 {
 471    __DRIscreen *spriv = intelScreen->driScrnPriv;
 472    int num_fences = 0;
 473
 474    intelScreen->no_hw = (getenv("INTEL_NO_HW") != NULL ||
 475                          getenv("INTEL_DEVID_OVERRIDE") != NULL);
 476
 477    intelScreen->bufmgr = intel_bufmgr_gem_init(spriv->fd, BATCH_SZ);
 478    if (intelScreen->bufmgr == NULL) {
 479       fprintf(stderr, "[%s:%u] Error initializing buffer manager.\n",
 480               __func__, __LINE__);
 481       return GL_FALSE;
 482    }
 483
 484    if (!intel_get_param(spriv, I915_PARAM_NUM_FENCES_AVAIL, &num_fences) ||
 485        num_fences == 0) {
 486       fprintf(stderr, "[%s: %u] Kernel 2.6.29 required.\n", __func__, __LINE__);
 487       return GL_FALSE;
 488    }
 489
 490    drm_intel_bufmgr_gem_enable_fenced_relocs(intelScreen->bufmgr);
 491
 492    intelScreen->named_regions = _mesa_NewHashTable();
 493
 494    intelScreen->relaxed_relocations = 0;
 495    intelScreen->relaxed_relocations |=
 496       intel_get_boolean(spriv, I915_PARAM_HAS_RELAXED_DELTA) << 0;
 497
 498    return GL_TRUE;
 499 }
 500
 501 /**
 502  * This is the driver specific part of the createNewScreen entry point.
 503  * Called when using DRI2.
 504  *
 505  * \return the struct gl_config supported by this driver
 506  */
 507 static const
 508 __DRIconfig **intelInitScreen2(__DRIscreen *psp)
 509 {
 510    struct intel_screen *intelScreen;
 511    GLenum fb_format[3];
 512    GLenum fb_type[3];
 513    unsigned int api_mask;
 514    char *devid_override;
 515
 516    static const GLenum back_buffer_modes[] = {
 517        GLX_NONE, GLX_SWAP_UNDEFINED_OML, GLX_SWAP_COPY_OML
 518    };
 519    uint8_t depth_bits[4], stencil_bits[4], msaa_samples_array[1];
 520    int color;
 521    __DRIconfig **configs = NULL;
 522
 523    /* Allocate the private area */
 524    intelScreen = CALLOC(sizeof *intelScreen);
 525    if (!intelScreen) {
 526       fprintf(stderr, "\nERROR!  Allocating private area failed\n");
 527       return GL_FALSE;
 528    }
 529    /* parse information in __driConfigOptions */
 530    driParseOptionInfo(&intelScreen->optionCache,
 531                       __driConfigOptions, __driNConfigOptions);
 532
 533    intelScreen->driScrnPriv = psp;
 534    psp->private = (void *) intelScreen;
 535
 536    /* Determine chipset ID */
 537    if (!intel_get_param(psp, I915_PARAM_CHIPSET_ID,
 538                         &intelScreen->deviceID))
 539       return GL_FALSE;
 540
 541    /* Allow an override of the device ID for the purpose of making the
 542     * driver produce dumps for debugging of new chipset enablement.
 543     * This implies INTEL_NO_HW, to avoid programming your actual GPU
 544     * incorrectly.
 545     */
 546    devid_override = getenv("INTEL_DEVID_OVERRIDE");
 547    if (devid_override) {
 548       intelScreen->deviceID = strtod(devid_override, NULL);
 549    }
 550
 551    api_mask = (1 << __DRI_API_OPENGL);
 552 #if FEATURE_ES1
 553    api_mask |= (1 << __DRI_API_GLES);
 554 #endif
 555 #if FEATURE_ES2
 556    api_mask |= (1 << __DRI_API_GLES2);
 557 #endif
 558
 559    if (IS_9XX(intelScreen->deviceID) || IS_965(intelScreen->deviceID))
 560       psp->api_mask = api_mask;
 561
 562    if (!intel_init_bufmgr(intelScreen))
 563        return GL_FALSE;
 564
 565    psp->extensions = intelScreenExtensions;
 566
 567    msaa_samples_array[0] = 0;
 568
 569    fb_format[0] = GL_RGB;
 570    fb_type[0] = GL_UNSIGNED_SHORT_5_6_5;
 571
 572    fb_format[1] = GL_BGR;
 573    fb_type[1] = GL_UNSIGNED_INT_8_8_8_8_REV;
 574
 575    fb_format[2] = GL_BGRA;
 576    fb_type[2] = GL_UNSIGNED_INT_8_8_8_8_REV;
 577
 578    depth_bits[0] = 0;
 579    stencil_bits[0] = 0;
 580
 581    /* Generate a rich set of useful configs that do not include an
 582     * accumulation buffer.
 583     */
 584    for (color = 0; color < ARRAY_SIZE(fb_format); color++) {
 585       __DRIconfig **new_configs;
 586       int depth_factor;
 587
 588       /* Starting with DRI2 protocol version 1.1 we can request a depth/stencil
 589        * buffer that has a diffferent number of bits per pixel than the color
 590        * buffer.  This isn't yet supported here.
 591        */
 592       if (fb_type[color] == GL_UNSIGNED_SHORT_5_6_5) {
 593          depth_bits[1] = 16;
 594          stencil_bits[1] = 0;
 595       } else {
 596          depth_bits[1] = 24;
 597          stencil_bits[1] = 8;
 598       }
 599
 600       depth_factor = 2;
 601
 602       new_configs = driCreateConfigs(fb_format[color], fb_type[color],
 603                                      depth_bits,
 604                                      stencil_bits,
 605                                      depth_factor,
 606                                      back_buffer_modes,
 607                                      ARRAY_SIZE(back_buffer_modes),
 608                                      msaa_samples_array,
 609                                      ARRAY_SIZE(msaa_samples_array),
 610                                      GL_FALSE);
 611       if (configs == NULL)
 612          configs = new_configs;
 613       else
 614          configs = driConcatConfigs(configs, new_configs);
 615    }
 616
 617    /* Generate the minimum possible set of configs that include an
 618     * accumulation buffer.
 619     */
 620    for (color = 0; color < ARRAY_SIZE(fb_format); color++) {
 621       __DRIconfig **new_configs;
 622
 623       if (fb_type[color] == GL_UNSIGNED_SHORT_5_6_5) {
 624          depth_bits[0] = 16;
 625          stencil_bits[0] = 0;
 626       } else {
 627          depth_bits[0] = 24;
 628          stencil_bits[0] = 8;
 629       }
 630
 631       new_configs = driCreateConfigs(fb_format[color], fb_type[color],
 632                                      depth_bits, stencil_bits, 1,
 633                                      back_buffer_modes + 1, 1,
 634                                      msaa_samples_array, 1,
 635                                      GL_TRUE);
 636       if (configs == NULL)
 637          configs = new_configs;
 638       else
 639          configs = driConcatConfigs(configs, new_configs);
 640    }
 641
 642    if (configs == NULL) {
 643       fprintf(stderr, "[%s:%u] Error creating FBConfig!\n", __func__,
 644               __LINE__);
 645       return NULL;
 646    }
 647
 648    return (const __DRIconfig **)configs;
 649 }
 650
 651 struct intel_buffer {
 652    __DRIbuffer base;
 653    struct intel_region *region;
 654 };
 655
 656 static __DRIbuffer *
 657 intelAllocateBuffer(__DRIscreen *screen,
 658                     unsigned attachment, unsigned format,
 659                     int width, int height)
 660 {
 661    struct intel_buffer *intelBuffer;
 662    struct intel_screen *intelScreen = screen->private;
 663
 664    intelBuffer = CALLOC(sizeof *intelBuffer);
 665    if (intelBuffer == NULL)
 666       return NULL;
 667
 668    intelBuffer->region = intel_region_alloc(intelScreen, I915_TILING_NONE,
 669                                             format / 8, width, height, GL_TRUE);
 670
 671    if (intelBuffer->region == NULL) {
 672            FREE(intelBuffer);
 673            return NULL;
 674    }
 675
 676    intel_region_flink(intelBuffer->region, &intelBuffer->base.name);
 677
 678    intelBuffer->base.attachment = attachment;
 679    intelBuffer->base.cpp = intelBuffer->region->cpp;
 680    intelBuffer->base.pitch =
 681          intelBuffer->region->pitch * intelBuffer->region->cpp;
 682
 683    return &intelBuffer->base;
 684 }
 685
 686 static void
 687 intelReleaseBuffer(__DRIscreen *screen, __DRIbuffer *buffer)
 688 {
 689    struct intel_buffer *intelBuffer = (struct intel_buffer *) buffer;
 690
 691    intel_region_release(&intelBuffer->region);
 692    free(intelBuffer);
 693 }
 694
 695
 696 const struct __DriverAPIRec driDriverAPI = {
 697    .DestroyScreen        = intelDestroyScreen,
 698    .CreateContext        = intelCreateContext,
 699    .DestroyContext       = intelDestroyContext,
 700    .CreateBuffer         = intelCreateBuffer,
 701    .DestroyBuffer        = intelDestroyBuffer,
 702    .MakeCurrent          = intelMakeCurrent,
 703    .UnbindContext        = intelUnbindContext,
 704    .InitScreen2          = intelInitScreen2,
 705    .AllocateBuffer       = intelAllocateBuffer,
 706    .ReleaseBuffer        = intelReleaseBuffer
 707 };
 708
 709 /* This is the table of extensions that the loader will dlsym() for. */
 710 PUBLIC const __DRIextension *__driDriverExtensions[] = {
 711     &driCoreExtension.base,
 712     &driDRI2Extension.base,
 713     NULL
 714 };