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 "main/glheader.h"
  29 #include "main/context.h"
  30 #include "main/framebuffer.h"
  31 #include "main/renderbuffer.h"
  32
  33 #include "utils.h"
  34 #include "vblank.h"
  35 #include "xmlpool.h"
  36
  37 #include "intel_batchbuffer.h"
  38 #include "intel_buffers.h"
  39 #include "intel_bufmgr.h"
  40 #include "intel_chipset.h"
  41 #include "intel_extensions.h"
  42 #include "intel_fbo.h"
  43 #include "intel_regions.h"
  44 #include "intel_swapbuffers.h"
  45 #include "intel_screen.h"
  46 #include "intel_span.h"
  47 #include "intel_tex.h"
  48
  49 #include "i915_drm.h"
  50 #include "i830_dri.h"
  51
  52 #define DRI_CONF_TEXTURE_TILING(def) \
  53         DRI_CONF_OPT_BEGIN(texture_tiling, bool, def)           \
  54                 DRI_CONF_DESC(en, "Enable texture tiling")      \
  55         DRI_CONF_OPT_END                                        \
  56
  57 PUBLIC const char __driConfigOptions[] =
  58    DRI_CONF_BEGIN
  59    DRI_CONF_SECTION_PERFORMANCE
  60       DRI_CONF_VBLANK_MODE(DRI_CONF_VBLANK_ALWAYS_SYNC)
  61       /* Options correspond to DRI_CONF_BO_REUSE_DISABLED,
  62        * DRI_CONF_BO_REUSE_ALL
  63        */
  64       DRI_CONF_OPT_BEGIN_V(bo_reuse, enum, 1, "0:1")
  65          DRI_CONF_DESC_BEGIN(en, "Buffer object reuse")
  66             DRI_CONF_ENUM(0, "Disable buffer object reuse")
  67             DRI_CONF_ENUM(1, "Enable reuse of all sizes of buffer objects")
  68          DRI_CONF_DESC_END
  69       DRI_CONF_OPT_END
  70
  71 #ifdef I915
  72      DRI_CONF_TEXTURE_TILING(false)
  73 #else
  74      DRI_CONF_TEXTURE_TILING(true)
  75 #endif
  76
  77       DRI_CONF_OPT_BEGIN(early_z, bool, false)
  78          DRI_CONF_DESC(en, "Enable early Z in classic mode (unstable, 945-only).")
  79       DRI_CONF_OPT_END
  80
  81       DRI_CONF_OPT_BEGIN(fragment_shader, bool, false)
  82          DRI_CONF_DESC(en, "Enable limited ARB_fragment_shader support on 915/945.")
  83       DRI_CONF_OPT_END
  84
  85    DRI_CONF_SECTION_END
  86    DRI_CONF_SECTION_QUALITY
  87       DRI_CONF_FORCE_S3TC_ENABLE(false)
  88       DRI_CONF_ALLOW_LARGE_TEXTURES(2)
  89    DRI_CONF_SECTION_END
  90    DRI_CONF_SECTION_DEBUG
  91      DRI_CONF_NO_RAST(false)
  92      DRI_CONF_ALWAYS_FLUSH_BATCH(false)
  93      DRI_CONF_ALWAYS_FLUSH_CACHE(false)
  94
  95       DRI_CONF_OPT_BEGIN(stub_occlusion_query, bool, false)
  96          DRI_CONF_DESC(en, "Enable stub ARB_occlusion_query support on 915/945.")
  97       DRI_CONF_OPT_END
  98    DRI_CONF_SECTION_END
  99 DRI_CONF_END;
 100
 101 const GLuint __driNConfigOptions = 11;
 102
 103 #ifdef USE_NEW_INTERFACE
 104 static PFNGLXCREATECONTEXTMODES create_context_modes = NULL;
 105 #endif /*USE_NEW_INTERFACE */
 106
 107 /**
 108  * Map all the memory regions described by the screen.
 109  * \return GL_TRUE if success, GL_FALSE if error.
 110  */
 111 GLboolean
 112 intelMapScreenRegions(__DRIscreen * sPriv)
 113 {
 114    intelScreenPrivate *intelScreen = (intelScreenPrivate *) sPriv->private;
 115
 116    if (0)
 117       _mesa_printf("TEX 0x%08x ", intelScreen->tex.handle);
 118    if (intelScreen->tex.size != 0) {
 119       if (drmMap(sPriv->fd,
 120                  intelScreen->tex.handle,
 121                  intelScreen->tex.size,
 122                  (drmAddress *) & intelScreen->tex.map) != 0) {
 123          intelUnmapScreenRegions(intelScreen);
 124          return GL_FALSE;
 125       }
 126    }
 127
 128    return GL_TRUE;
 129 }
 130
 131 void
 132 intelUnmapScreenRegions(intelScreenPrivate * intelScreen)
 133 {
 134    if (intelScreen->tex.map) {
 135       drmUnmap(intelScreen->tex.map, intelScreen->tex.size);
 136       intelScreen->tex.map = NULL;
 137    }
 138 }
 139
 140
 141 static void
 142 intelPrintDRIInfo(intelScreenPrivate * intelScreen,
 143                   __DRIscreen * sPriv, I830DRIPtr gDRIPriv)
 144 {
 145    fprintf(stderr, "*** Front size:   0x%x  offset: 0x%x  pitch: %d\n",
 146            intelScreen->front.size, intelScreen->front.offset,
 147            intelScreen->pitch);
 148    fprintf(stderr, "*** Back size:    0x%x  offset: 0x%x  pitch: %d\n",
 149            intelScreen->back.size, intelScreen->back.offset,
 150            intelScreen->pitch);
 151    fprintf(stderr, "*** Depth size:   0x%x  offset: 0x%x  pitch: %d\n",
 152            intelScreen->depth.size, intelScreen->depth.offset,
 153            intelScreen->pitch);
 154    fprintf(stderr, "*** Texture size: 0x%x  offset: 0x%x\n",
 155            intelScreen->tex.size, intelScreen->tex.offset);
 156    fprintf(stderr, "*** Memory : 0x%x\n", gDRIPriv->mem);
 157 }
 158
 159
 160 static void
 161 intelPrintSAREA(const drm_i915_sarea_t * sarea)
 162 {
 163    fprintf(stderr, "SAREA: sarea width %d  height %d\n", sarea->width,
 164            sarea->height);
 165    fprintf(stderr, "SAREA: pitch: %d\n", sarea->pitch);
 166    fprintf(stderr,
 167            "SAREA: front offset: 0x%08x  size: 0x%x  handle: 0x%x tiled: %d\n",
 168            sarea->front_offset, sarea->front_size,
 169            (unsigned) sarea->front_handle, sarea->front_tiled);
 170    fprintf(stderr,
 171            "SAREA: back  offset: 0x%08x  size: 0x%x  handle: 0x%x tiled: %d\n",
 172            sarea->back_offset, sarea->back_size,
 173            (unsigned) sarea->back_handle, sarea->back_tiled);
 174    fprintf(stderr, "SAREA: depth offset: 0x%08x  size: 0x%x  handle: 0x%x tiled: %d\n",
 175            sarea->depth_offset, sarea->depth_size,
 176            (unsigned) sarea->depth_handle, sarea->depth_tiled);
 177    fprintf(stderr, "SAREA: tex   offset: 0x%08x  size: 0x%x  handle: 0x%x\n",
 178            sarea->tex_offset, sarea->tex_size, (unsigned) sarea->tex_handle);
 179 }
 180
 181
 182 /**
 183  * A number of the screen parameters are obtained/computed from
 184  * information in the SAREA.  This function updates those parameters.
 185  */
 186 static void
 187 intelUpdateScreenFromSAREA(intelScreenPrivate * intelScreen,
 188                            drm_i915_sarea_t * sarea)
 189 {
 190    intelScreen->width = sarea->width;
 191    intelScreen->height = sarea->height;
 192    intelScreen->pitch = sarea->pitch;
 193
 194    intelScreen->front.offset = sarea->front_offset;
 195    intelScreen->front.handle = sarea->front_handle;
 196    intelScreen->front.size = sarea->front_size;
 197    intelScreen->front.tiled = sarea->front_tiled;
 198
 199    intelScreen->back.offset = sarea->back_offset;
 200    intelScreen->back.handle = sarea->back_handle;
 201    intelScreen->back.size = sarea->back_size;
 202    intelScreen->back.tiled = sarea->back_tiled;
 203
 204    intelScreen->depth.offset = sarea->depth_offset;
 205    intelScreen->depth.handle = sarea->depth_handle;
 206    intelScreen->depth.size = sarea->depth_size;
 207    intelScreen->depth.tiled = sarea->depth_tiled;
 208
 209    if (intelScreen->driScrnPriv->ddx_version.minor >= 9) {
 210       intelScreen->front.bo_handle = sarea->front_bo_handle;
 211       intelScreen->back.bo_handle = sarea->back_bo_handle;
 212       intelScreen->depth.bo_handle = sarea->depth_bo_handle;
 213    } else {
 214       intelScreen->front.bo_handle = -1;
 215       intelScreen->back.bo_handle = -1;
 216       intelScreen->depth.bo_handle = -1;
 217    }
 218
 219    intelScreen->tex.offset = sarea->tex_offset;
 220    intelScreen->logTextureGranularity = sarea->log_tex_granularity;
 221    intelScreen->tex.handle = sarea->tex_handle;
 222    intelScreen->tex.size = sarea->tex_size;
 223
 224    if (0)
 225       intelPrintSAREA(sarea);
 226 }
 227
 228 static const __DRItexOffsetExtension intelTexOffsetExtension = {
 229    { __DRI_TEX_OFFSET },
 230    intelSetTexOffset,
 231 };
 232
 233 static const __DRItexBufferExtension intelTexBufferExtension = {
 234     { __DRI_TEX_BUFFER, __DRI_TEX_BUFFER_VERSION },
 235    intelSetTexBuffer,
 236    intelSetTexBuffer2,
 237 };
 238
 239 static const __DRIextension *intelScreenExtensions[] = {
 240     &driReadDrawableExtension,
 241     &driSwapControlExtension.base,
 242     &driFrameTrackingExtension.base,
 243     &driMediaStreamCounterExtension.base,
 244     &intelTexOffsetExtension.base,
 245     &intelTexBufferExtension.base,
 246     NULL
 247 };
 248
 249 static GLboolean
 250 intel_get_param(__DRIscreen *psp, int param, int *value)
 251 {
 252    int ret;
 253    struct drm_i915_getparam gp;
 254
 255    gp.param = param;
 256    gp.value = value;
 257
 258    ret = drmCommandWriteRead(psp->fd, DRM_I915_GETPARAM, &gp, sizeof(gp));
 259    if (ret) {
 260       _mesa_warning(NULL, "drm_i915_getparam: %d", ret);
 261       return GL_FALSE;
 262    }
 263
 264    return GL_TRUE;
 265 }
 266
 267 static GLboolean intelInitDriver(__DRIscreen *sPriv)
 268 {
 269    intelScreenPrivate *intelScreen;
 270    I830DRIPtr gDRIPriv = (I830DRIPtr) sPriv->pDevPriv;
 271    drm_i915_sarea_t *sarea;
 272
 273    if (sPriv->devPrivSize != sizeof(I830DRIRec)) {
 274       fprintf(stderr,
 275               "\nERROR!  sizeof(I830DRIRec) does not match passed size from device driver\n");
 276       return GL_FALSE;
 277    }
 278
 279    /* Allocate the private area */
 280    intelScreen = (intelScreenPrivate *) CALLOC(sizeof(intelScreenPrivate));
 281    if (!intelScreen) {
 282       fprintf(stderr, "\nERROR!  Allocating private area failed\n");
 283       return GL_FALSE;
 284    }
 285    /* parse information in __driConfigOptions */
 286    driParseOptionInfo(&intelScreen->optionCache,
 287                       __driConfigOptions, __driNConfigOptions);
 288
 289    intelScreen->driScrnPriv = sPriv;
 290    sPriv->private = (void *) intelScreen;
 291    sarea = (drm_i915_sarea_t *)
 292       (((GLubyte *) sPriv->pSAREA) + gDRIPriv->sarea_priv_offset);
 293    intelScreen->sarea = sarea;
 294
 295    intelScreen->deviceID = gDRIPriv->deviceID;
 296
 297    intelUpdateScreenFromSAREA(intelScreen, sarea);
 298
 299    if (!intelMapScreenRegions(sPriv)) {
 300       fprintf(stderr, "\nERROR!  mapping regions\n");
 301       _mesa_free(intelScreen);
 302       sPriv->private = NULL;
 303       return GL_FALSE;
 304    }
 305
 306    if (0)
 307       intelPrintDRIInfo(intelScreen, sPriv, gDRIPriv);
 308
 309    intelScreen->drmMinor = sPriv->drm_version.minor;
 310
 311    /* Determine if IRQs are active? */
 312    if (!intel_get_param(sPriv, I915_PARAM_IRQ_ACTIVE,
 313                         &intelScreen->irq_active))
 314       return GL_FALSE;
 315
 316    sPriv->extensions = intelScreenExtensions;
 317
 318    return GL_TRUE;
 319 }
 320
 321
 322 static void
 323 intelDestroyScreen(__DRIscreen * sPriv)
 324 {
 325    intelScreenPrivate *intelScreen = (intelScreenPrivate *) sPriv->private;
 326
 327    dri_bufmgr_destroy(intelScreen->bufmgr);
 328    intelUnmapScreenRegions(intelScreen);
 329    driDestroyOptionInfo(&intelScreen->optionCache);
 330
 331    FREE(intelScreen);
 332    sPriv->private = NULL;
 333 }
 334
 335
 336 /**
 337  * This is called when we need to set up GL rendering to a new X window.
 338  */
 339 static GLboolean
 340 intelCreateBuffer(__DRIscreen * driScrnPriv,
 341                   __DRIdrawable * driDrawPriv,
 342                   const __GLcontextModes * mesaVis, GLboolean isPixmap)
 343 {
 344    if (isPixmap) {
 345       return GL_FALSE;          /* not implemented */
 346    }
 347    else {
 348       GLboolean swStencil = (mesaVis->stencilBits > 0 &&
 349                              mesaVis->depthBits != 24);
 350       gl_format rgbFormat;
 351
 352       struct intel_framebuffer *intel_fb = CALLOC_STRUCT(intel_framebuffer);
 353
 354       if (!intel_fb)
 355          return GL_FALSE;
 356
 357       _mesa_initialize_framebuffer(&intel_fb->Base, mesaVis);
 358
 359       if (mesaVis->redBits == 5)
 360          rgbFormat = MESA_FORMAT_RGB565;
 361       else if (mesaVis->alphaBits == 0)
 362          rgbFormat = MESA_FORMAT_XRGB8888;
 363       else
 364          rgbFormat = MESA_FORMAT_ARGB8888;
 365
 366       /* setup the hardware-based renderbuffers */
 367       intel_fb->color_rb[0] = intel_create_renderbuffer(rgbFormat);
 368       _mesa_add_renderbuffer(&intel_fb->Base, BUFFER_FRONT_LEFT,
 369                              &intel_fb->color_rb[0]->Base);
 370
 371       if (mesaVis->doubleBufferMode) {
 372          intel_fb->color_rb[1] = intel_create_renderbuffer(rgbFormat);
 373
 374          _mesa_add_renderbuffer(&intel_fb->Base, BUFFER_BACK_LEFT,
 375                                 &intel_fb->color_rb[1]->Base);
 376
 377       }
 378
 379       if (mesaVis->depthBits == 24) {
 380          if (mesaVis->stencilBits == 8) {
 381             /* combined depth/stencil buffer */
 382             struct intel_renderbuffer *depthStencilRb
 383                = intel_create_renderbuffer(MESA_FORMAT_S8_Z24);
 384             /* note: bind RB to two attachment points */
 385             _mesa_add_renderbuffer(&intel_fb->Base, BUFFER_DEPTH,
 386                                    &depthStencilRb->Base);
 387             _mesa_add_renderbuffer(&intel_fb->Base, BUFFER_STENCIL,
 388                                    &depthStencilRb->Base);
 389          } else {
 390             struct intel_renderbuffer *depthRb
 391                = intel_create_renderbuffer(MESA_FORMAT_X8_Z24);
 392             _mesa_add_renderbuffer(&intel_fb->Base, BUFFER_DEPTH,
 393                                    &depthRb->Base);
 394          }
 395       }
 396       else if (mesaVis->depthBits == 16) {
 397          /* just 16-bit depth buffer, no hw stencil */
 398          struct intel_renderbuffer *depthRb
 399             = intel_create_renderbuffer(MESA_FORMAT_Z16);
 400          _mesa_add_renderbuffer(&intel_fb->Base, BUFFER_DEPTH, &depthRb->Base);
 401       }
 402
 403       /* now add any/all software-based renderbuffers we may need */
 404       _mesa_add_soft_renderbuffers(&intel_fb->Base,
 405                                    GL_FALSE, /* never sw color */
 406                                    GL_FALSE, /* never sw depth */
 407                                    swStencil, mesaVis->accumRedBits > 0,
 408                                    GL_FALSE, /* never sw alpha */
 409                                    GL_FALSE  /* never sw aux */ );
 410       driDrawPriv->driverPrivate = (void *) intel_fb;
 411
 412       return GL_TRUE;
 413    }
 414 }
 415
 416 static void
 417 intelDestroyBuffer(__DRIdrawable * driDrawPriv)
 418 {
 419    struct intel_framebuffer *intel_fb = driDrawPriv->driverPrivate;
 420    struct intel_renderbuffer *depth_rb;
 421    struct intel_renderbuffer *stencil_rb;
 422
 423    if (intel_fb) {
 424       if (intel_fb->color_rb[0]) {
 425          intel_renderbuffer_set_region(intel_fb->color_rb[0], NULL);
 426       }
 427
 428       if (intel_fb->color_rb[1]) {
 429          intel_renderbuffer_set_region(intel_fb->color_rb[1], NULL);
 430       }
 431
 432       depth_rb = intel_get_renderbuffer(&intel_fb->Base, BUFFER_DEPTH);
 433       if (depth_rb) {
 434          intel_renderbuffer_set_region(depth_rb, NULL);
 435       }
 436
 437       stencil_rb = intel_get_renderbuffer(&intel_fb->Base, BUFFER_STENCIL);
 438       if (stencil_rb) {
 439          intel_renderbuffer_set_region(stencil_rb, NULL);
 440       }
 441    }
 442
 443    _mesa_reference_framebuffer((GLframebuffer **)(&(driDrawPriv->driverPrivate)), NULL);
 444 }
 445
 446
 447 /**
 448  * Get information about previous buffer swaps.
 449  */
 450 static int
 451 intelGetSwapInfo(__DRIdrawable * dPriv, __DRIswapInfo * sInfo)
 452 {
 453    struct intel_framebuffer *intel_fb;
 454
 455    if ((dPriv == NULL) || (dPriv->driverPrivate == NULL)
 456        || (sInfo == NULL)) {
 457       return -1;
 458    }
 459
 460    intel_fb = dPriv->driverPrivate;
 461    sInfo->swap_count = intel_fb->swap_count;
 462    sInfo->swap_ust = intel_fb->swap_ust;
 463    sInfo->swap_missed_count = intel_fb->swap_missed_count;
 464
 465    sInfo->swap_missed_usage = (sInfo->swap_missed_count != 0)
 466       ? driCalculateSwapUsage(dPriv, 0, intel_fb->swap_missed_ust)
 467       : 0.0;
 468
 469    return 0;
 470 }
 471
 472
 473 /* There are probably better ways to do this, such as an
 474  * init-designated function to register chipids and createcontext
 475  * functions.
 476  */
 477 extern GLboolean i830CreateContext(const __GLcontextModes * mesaVis,
 478                                    __DRIcontext * driContextPriv,
 479                                    void *sharedContextPrivate);
 480
 481 extern GLboolean i915CreateContext(const __GLcontextModes * mesaVis,
 482                                    __DRIcontext * driContextPriv,
 483                                    void *sharedContextPrivate);
 484 extern GLboolean brwCreateContext(const __GLcontextModes * mesaVis,
 485                                   __DRIcontext * driContextPriv,
 486                                   void *sharedContextPrivate);
 487
 488 static GLboolean
 489 intelCreateContext(const __GLcontextModes * mesaVis,
 490                    __DRIcontext * driContextPriv,
 491                    void *sharedContextPrivate)
 492 {
 493    __DRIscreen *sPriv = driContextPriv->driScreenPriv;
 494    intelScreenPrivate *intelScreen = (intelScreenPrivate *) sPriv->private;
 495
 496 #ifdef I915
 497    if (IS_9XX(intelScreen->deviceID)) {
 498       if (!IS_965(intelScreen->deviceID)) {
 499          return i915CreateContext(mesaVis, driContextPriv,
 500                                   sharedContextPrivate);
 501       }
 502    } else {
 503       intelScreen->no_vbo = GL_TRUE;
 504       return i830CreateContext(mesaVis, driContextPriv, sharedContextPrivate);
 505    }
 506 #else
 507    if (IS_965(intelScreen->deviceID))
 508       return brwCreateContext(mesaVis, driContextPriv, sharedContextPrivate);
 509 #endif
 510    fprintf(stderr, "Unrecognized deviceID %x\n", intelScreen->deviceID);
 511    return GL_FALSE;
 512 }
 513
 514 static GLboolean
 515 intel_init_bufmgr(intelScreenPrivate *intelScreen)
 516 {
 517    int gem_kernel = 0;
 518    struct drm_i915_getparam gp;
 519    __DRIscreen *spriv = intelScreen->driScrnPriv;
 520    int num_fences = 0;
 521
 522    intelScreen->no_hw = getenv("INTEL_NO_HW") != NULL;
 523
 524    gp.param = I915_PARAM_HAS_GEM;
 525    gp.value = &gem_kernel;
 526
 527    (void) drmCommandWriteRead(spriv->fd, DRM_I915_GETPARAM, &gp, sizeof(gp));
 528
 529    /* If we've got a new enough DDX that's initializing GEM and giving us
 530     * object handles for the shared buffers, use that.
 531     */
 532    if (!intelScreen->driScrnPriv->dri2.enabled &&
 533        intelScreen->driScrnPriv->ddx_version.minor < 9) {
 534       fprintf(stderr, "[%s:%u] Error initializing GEM.\n",
 535               __func__, __LINE__);
 536       return GL_FALSE;
 537    }
 538
 539    intelScreen->bufmgr = intel_bufmgr_gem_init(spriv->fd, BATCH_SZ);
 540    /* Otherwise, use the classic buffer manager. */
 541    if (intelScreen->bufmgr == NULL) {
 542       fprintf(stderr, "[%s:%u] Error initializing buffer manager.\n",
 543               __func__, __LINE__);
 544       return GL_FALSE;
 545    }
 546
 547    if (intel_get_param(spriv, I915_PARAM_NUM_FENCES_AVAIL, &num_fences))
 548       intelScreen->kernel_exec_fencing = !!num_fences;
 549    else
 550       intelScreen->kernel_exec_fencing = GL_FALSE;
 551
 552    return GL_TRUE;
 553 }
 554
 555 struct intel_context *intelScreenContext(intelScreenPrivate *intelScreen)
 556 {
 557   /*
 558    * This should probably change to have the screen allocate a dummy
 559    * context at screen creation. For now just use the current context.
 560    */
 561
 562   GET_CURRENT_CONTEXT(ctx);
 563   if (ctx == NULL) {
 564      _mesa_problem(NULL, "No current context in intelScreenContext\n");
 565      return NULL;
 566   }
 567   return intel_context(ctx);
 568 }
 569
 570 /**
 571  * This is the driver specific part of the createNewScreen entry point.
 572  * Called when using DRI2.
 573  *
 574  * \return the __GLcontextModes supported by this driver
 575  */
 576 static const
 577 __DRIconfig **intelInitScreen2(__DRIscreen *psp)
 578 {
 579    intelScreenPrivate *intelScreen;
 580    GLenum fb_format[3];
 581    GLenum fb_type[3];
 582    /* GLX_SWAP_COPY_OML is only supported because the Intel driver doesn't
 583     * support pageflipping at all.
 584     */
 585    static const GLenum back_buffer_modes[] = {
 586       GLX_NONE, GLX_SWAP_UNDEFINED_OML, GLX_SWAP_COPY_OML
 587    };
 588    uint8_t depth_bits[4], stencil_bits[4], msaa_samples_array[1];
 589    int color;
 590    __DRIconfig **configs = NULL;
 591
 592    /* Allocate the private area */
 593    intelScreen = (intelScreenPrivate *) CALLOC(sizeof(intelScreenPrivate));
 594    if (!intelScreen) {
 595       fprintf(stderr, "\nERROR!  Allocating private area failed\n");
 596       return GL_FALSE;
 597    }
 598    /* parse information in __driConfigOptions */
 599    driParseOptionInfo(&intelScreen->optionCache,
 600                       __driConfigOptions, __driNConfigOptions);
 601
 602    intelScreen->driScrnPriv = psp;
 603    psp->private = (void *) intelScreen;
 604
 605    intelScreen->drmMinor = psp->drm_version.minor;
 606
 607    /* Determine chipset ID */
 608    if (!intel_get_param(psp, I915_PARAM_CHIPSET_ID,
 609                         &intelScreen->deviceID))
 610       return GL_FALSE;
 611
 612    if (!intel_init_bufmgr(intelScreen))
 613        return GL_FALSE;
 614
 615    intelScreen->irq_active = 1;
 616    psp->extensions = intelScreenExtensions;
 617
 618    depth_bits[0] = 0;
 619    stencil_bits[0] = 0;
 620    depth_bits[1] = 16;
 621    stencil_bits[1] = 0;
 622    depth_bits[2] = 24;
 623    stencil_bits[2] = 0;
 624    depth_bits[3] = 24;
 625    stencil_bits[3] = 8;
 626
 627    msaa_samples_array[0] = 0;
 628
 629    fb_format[0] = GL_RGB;
 630    fb_type[0] = GL_UNSIGNED_SHORT_5_6_5;
 631
 632    fb_format[1] = GL_BGR;
 633    fb_type[1] = GL_UNSIGNED_INT_8_8_8_8_REV;
 634
 635    fb_format[2] = GL_BGRA;
 636    fb_type[2] = GL_UNSIGNED_INT_8_8_8_8_REV;
 637
 638    depth_bits[0] = 0;
 639    stencil_bits[0] = 0;
 640
 641    for (color = 0; color < ARRAY_SIZE(fb_format); color++) {
 642       __DRIconfig **new_configs;
 643       int depth_factor;
 644
 645       /* With DRI2 right now, GetBuffers always returns a depth/stencil buffer
 646        * with the same cpp as the drawable.  So we can't support depth cpp !=
 647        * color cpp currently.
 648        */
 649       if (fb_type[color] == GL_UNSIGNED_SHORT_5_6_5) {
 650          depth_bits[1] = 16;
 651          stencil_bits[1] = 0;
 652
 653          depth_factor = 2;
 654       } else {
 655          depth_bits[1] = 24;
 656          stencil_bits[1] = 0;
 657          depth_bits[2] = 24;
 658          stencil_bits[2] = 8;
 659
 660          depth_factor = 3;
 661       }
 662       new_configs = driCreateConfigs(fb_format[color], fb_type[color],
 663                                      depth_bits,
 664                                      stencil_bits,
 665                                      depth_factor,
 666                                      back_buffer_modes,
 667                                      ARRAY_SIZE(back_buffer_modes),
 668                                      msaa_samples_array,
 669                                      ARRAY_SIZE(msaa_samples_array));
 670       if (configs == NULL)
 671          configs = new_configs;
 672       else
 673          configs = driConcatConfigs(configs, new_configs);
 674    }
 675
 676    if (configs == NULL) {
 677       fprintf(stderr, "[%s:%u] Error creating FBConfig!\n", __func__,
 678               __LINE__);
 679       return NULL;
 680    }
 681
 682    return (const __DRIconfig **)configs;
 683 }
 684
 685 const struct __DriverAPIRec driDriverAPI = {
 686    .DestroyScreen        = intelDestroyScreen,
 687    .CreateContext        = intelCreateContext,
 688    .DestroyContext       = intelDestroyContext,
 689    .CreateBuffer         = intelCreateBuffer,
 690    .DestroyBuffer        = intelDestroyBuffer,
 691    .MakeCurrent          = intelMakeCurrent,
 692    .UnbindContext        = intelUnbindContext,
 693    .GetSwapInfo          = intelGetSwapInfo,
 694    .GetDrawableMSC       = driDrawableGetMSC32,
 695    .WaitForMSC           = driWaitForMSC32,
 696
 697    .InitScreen2          = intelInitScreen2,
 698 };
 699
 700 /* This is the table of extensions that the loader will dlsym() for. */
 701 PUBLIC const __DRIextension *__driDriverExtensions[] = {
 702     &driCoreExtension.base,
 703     &driDRI2Extension.base,
 704     NULL
 705 };