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_FTHROTTLE_MODE(DRI_CONF_FTHROTTLE_IRQS)
  61       DRI_CONF_VBLANK_MODE(DRI_CONF_VBLANK_ALWAYS_SYNC)
  62       /* Options correspond to DRI_CONF_BO_REUSE_DISABLED,
  63        * DRI_CONF_BO_REUSE_ALL
  64        */
  65       DRI_CONF_OPT_BEGIN_V(bo_reuse, enum, 1, "0:1")
  66          DRI_CONF_DESC_BEGIN(en, "Buffer object reuse")
  67             DRI_CONF_ENUM(0, "Disable buffer object reuse")
  68             DRI_CONF_ENUM(1, "Enable reuse of all sizes of buffer objects")
  69          DRI_CONF_DESC_END
  70       DRI_CONF_OPT_END
  71
  72 #ifdef I915
  73      DRI_CONF_TEXTURE_TILING(false)
  74 #else
  75      DRI_CONF_TEXTURE_TILING(true)
  76 #endif
  77
  78    DRI_CONF_SECTION_END
  79    DRI_CONF_SECTION_QUALITY
  80       DRI_CONF_FORCE_S3TC_ENABLE(false)
  81       DRI_CONF_ALLOW_LARGE_TEXTURES(2)
  82    DRI_CONF_SECTION_END
  83    DRI_CONF_SECTION_DEBUG
  84      DRI_CONF_NO_RAST(false)
  85      DRI_CONF_ALWAYS_FLUSH_BATCH(false)
  86      DRI_CONF_ALWAYS_FLUSH_CACHE(false)
  87    DRI_CONF_SECTION_END
  88 DRI_CONF_END;
  89
  90 const GLuint __driNConfigOptions = 9;
  91
  92 #ifdef USE_NEW_INTERFACE
  93 static PFNGLXCREATECONTEXTMODES create_context_modes = NULL;
  94 #endif /*USE_NEW_INTERFACE */
  95
  96 /**
  97  * Map all the memory regions described by the screen.
  98  * \return GL_TRUE if success, GL_FALSE if error.
  99  */
 100 GLboolean
 101 intelMapScreenRegions(__DRIscreenPrivate * sPriv)
 102 {
 103    intelScreenPrivate *intelScreen = (intelScreenPrivate *) sPriv->private;
 104
 105    if (0)
 106       _mesa_printf("TEX 0x%08x ", intelScreen->tex.handle);
 107    if (intelScreen->tex.size != 0) {
 108       if (drmMap(sPriv->fd,
 109                  intelScreen->tex.handle,
 110                  intelScreen->tex.size,
 111                  (drmAddress *) & intelScreen->tex.map) != 0) {
 112          intelUnmapScreenRegions(intelScreen);
 113          return GL_FALSE;
 114       }
 115    }
 116
 117    return GL_TRUE;
 118 }
 119
 120 void
 121 intelUnmapScreenRegions(intelScreenPrivate * intelScreen)
 122 {
 123    if (intelScreen->tex.map) {
 124       drmUnmap(intelScreen->tex.map, intelScreen->tex.size);
 125       intelScreen->tex.map = NULL;
 126    }
 127 }
 128
 129
 130 static void
 131 intelPrintDRIInfo(intelScreenPrivate * intelScreen,
 132                   __DRIscreenPrivate * sPriv, I830DRIPtr gDRIPriv)
 133 {
 134    fprintf(stderr, "*** Front size:   0x%x  offset: 0x%x  pitch: %d\n",
 135            intelScreen->front.size, intelScreen->front.offset,
 136            intelScreen->pitch);
 137    fprintf(stderr, "*** Back size:    0x%x  offset: 0x%x  pitch: %d\n",
 138            intelScreen->back.size, intelScreen->back.offset,
 139            intelScreen->pitch);
 140    fprintf(stderr, "*** Depth size:   0x%x  offset: 0x%x  pitch: %d\n",
 141            intelScreen->depth.size, intelScreen->depth.offset,
 142            intelScreen->pitch);
 143    fprintf(stderr, "*** Texture size: 0x%x  offset: 0x%x\n",
 144            intelScreen->tex.size, intelScreen->tex.offset);
 145    fprintf(stderr, "*** Memory : 0x%x\n", gDRIPriv->mem);
 146 }
 147
 148
 149 static void
 150 intelPrintSAREA(const drm_i915_sarea_t * sarea)
 151 {
 152    fprintf(stderr, "SAREA: sarea width %d  height %d\n", sarea->width,
 153            sarea->height);
 154    fprintf(stderr, "SAREA: pitch: %d\n", sarea->pitch);
 155    fprintf(stderr,
 156            "SAREA: front offset: 0x%08x  size: 0x%x  handle: 0x%x tiled: %d\n",
 157            sarea->front_offset, sarea->front_size,
 158            (unsigned) sarea->front_handle, sarea->front_tiled);
 159    fprintf(stderr,
 160            "SAREA: back  offset: 0x%08x  size: 0x%x  handle: 0x%x tiled: %d\n",
 161            sarea->back_offset, sarea->back_size,
 162            (unsigned) sarea->back_handle, sarea->back_tiled);
 163    fprintf(stderr, "SAREA: depth offset: 0x%08x  size: 0x%x  handle: 0x%x tiled: %d\n",
 164            sarea->depth_offset, sarea->depth_size,
 165            (unsigned) sarea->depth_handle, sarea->depth_tiled);
 166    fprintf(stderr, "SAREA: tex   offset: 0x%08x  size: 0x%x  handle: 0x%x\n",
 167            sarea->tex_offset, sarea->tex_size, (unsigned) sarea->tex_handle);
 168 }
 169
 170
 171 /**
 172  * A number of the screen parameters are obtained/computed from
 173  * information in the SAREA.  This function updates those parameters.
 174  */
 175 static void
 176 intelUpdateScreenFromSAREA(intelScreenPrivate * intelScreen,
 177                            drm_i915_sarea_t * sarea)
 178 {
 179    intelScreen->width = sarea->width;
 180    intelScreen->height = sarea->height;
 181    intelScreen->pitch = sarea->pitch;
 182
 183    intelScreen->front.offset = sarea->front_offset;
 184    intelScreen->front.handle = sarea->front_handle;
 185    intelScreen->front.size = sarea->front_size;
 186    intelScreen->front.tiled = sarea->front_tiled;
 187
 188    intelScreen->back.offset = sarea->back_offset;
 189    intelScreen->back.handle = sarea->back_handle;
 190    intelScreen->back.size = sarea->back_size;
 191    intelScreen->back.tiled = sarea->back_tiled;
 192
 193    intelScreen->depth.offset = sarea->depth_offset;
 194    intelScreen->depth.handle = sarea->depth_handle;
 195    intelScreen->depth.size = sarea->depth_size;
 196    intelScreen->depth.tiled = sarea->depth_tiled;
 197
 198    if (intelScreen->driScrnPriv->ddx_version.minor >= 9) {
 199       intelScreen->front.bo_handle = sarea->front_bo_handle;
 200       intelScreen->back.bo_handle = sarea->back_bo_handle;
 201       intelScreen->depth.bo_handle = sarea->depth_bo_handle;
 202    } else {
 203       intelScreen->front.bo_handle = -1;
 204       intelScreen->back.bo_handle = -1;
 205       intelScreen->depth.bo_handle = -1;
 206    }
 207
 208    intelScreen->tex.offset = sarea->tex_offset;
 209    intelScreen->logTextureGranularity = sarea->log_tex_granularity;
 210    intelScreen->tex.handle = sarea->tex_handle;
 211    intelScreen->tex.size = sarea->tex_size;
 212
 213    if (0)
 214       intelPrintSAREA(sarea);
 215 }
 216
 217 static const __DRItexOffsetExtension intelTexOffsetExtension = {
 218    { __DRI_TEX_OFFSET },
 219    intelSetTexOffset,
 220 };
 221
 222 static const __DRItexBufferExtension intelTexBufferExtension = {
 223     { __DRI_TEX_BUFFER, __DRI_TEX_BUFFER_VERSION },
 224    intelSetTexBuffer,
 225    intelSetTexBuffer2,
 226 };
 227
 228 static const __DRIextension *intelScreenExtensions[] = {
 229     &driReadDrawableExtension,
 230     &driCopySubBufferExtension.base,
 231     &driSwapControlExtension.base,
 232     &driFrameTrackingExtension.base,
 233     &driMediaStreamCounterExtension.base,
 234     &intelTexOffsetExtension.base,
 235     &intelTexBufferExtension.base,
 236     NULL
 237 };
 238
 239 static GLboolean
 240 intel_get_param(__DRIscreenPrivate *psp, int param, int *value)
 241 {
 242    int ret;
 243    struct drm_i915_getparam gp;
 244
 245    gp.param = param;
 246    gp.value = value;
 247
 248    ret = drmCommandWriteRead(psp->fd, DRM_I915_GETPARAM, &gp, sizeof(gp));
 249    if (ret) {
 250       _mesa_warning(NULL, "drm_i915_getparam: %d\n", ret);
 251       return GL_FALSE;
 252    }
 253
 254    return GL_TRUE;
 255 }
 256
 257 static GLboolean intelInitDriver(__DRIscreenPrivate *sPriv)
 258 {
 259    intelScreenPrivate *intelScreen;
 260    I830DRIPtr gDRIPriv = (I830DRIPtr) sPriv->pDevPriv;
 261    drm_i915_sarea_t *sarea;
 262
 263    if (sPriv->devPrivSize != sizeof(I830DRIRec)) {
 264       fprintf(stderr,
 265               "\nERROR!  sizeof(I830DRIRec) does not match passed size from device driver\n");
 266       return GL_FALSE;
 267    }
 268
 269    /* Allocate the private area */
 270    intelScreen = (intelScreenPrivate *) CALLOC(sizeof(intelScreenPrivate));
 271    if (!intelScreen) {
 272       fprintf(stderr, "\nERROR!  Allocating private area failed\n");
 273       return GL_FALSE;
 274    }
 275    /* parse information in __driConfigOptions */
 276    driParseOptionInfo(&intelScreen->optionCache,
 277                       __driConfigOptions, __driNConfigOptions);
 278
 279    intelScreen->driScrnPriv = sPriv;
 280    sPriv->private = (void *) intelScreen;
 281    sarea = (drm_i915_sarea_t *)
 282       (((GLubyte *) sPriv->pSAREA) + gDRIPriv->sarea_priv_offset);
 283    intelScreen->sarea = sarea;
 284
 285    intelScreen->deviceID = gDRIPriv->deviceID;
 286
 287    intelUpdateScreenFromSAREA(intelScreen, sarea);
 288
 289    if (!intelMapScreenRegions(sPriv)) {
 290       fprintf(stderr, "\nERROR!  mapping regions\n");
 291       _mesa_free(intelScreen);
 292       sPriv->private = NULL;
 293       return GL_FALSE;
 294    }
 295
 296    if (0)
 297       intelPrintDRIInfo(intelScreen, sPriv, gDRIPriv);
 298
 299    intelScreen->drmMinor = sPriv->drm_version.minor;
 300
 301    /* Determine if IRQs are active? */
 302    if (!intel_get_param(sPriv, I915_PARAM_IRQ_ACTIVE,
 303                         &intelScreen->irq_active))
 304       return GL_FALSE;
 305
 306    sPriv->extensions = intelScreenExtensions;
 307
 308    return GL_TRUE;
 309 }
 310
 311
 312 static void
 313 intelDestroyScreen(__DRIscreenPrivate * sPriv)
 314 {
 315    intelScreenPrivate *intelScreen = (intelScreenPrivate *) sPriv->private;
 316
 317    dri_bufmgr_destroy(intelScreen->bufmgr);
 318    intelUnmapScreenRegions(intelScreen);
 319    driDestroyOptionCache(&intelScreen->optionCache);
 320
 321    FREE(intelScreen);
 322    sPriv->private = NULL;
 323 }
 324
 325
 326 /**
 327  * This is called when we need to set up GL rendering to a new X window.
 328  */
 329 static GLboolean
 330 intelCreateBuffer(__DRIscreenPrivate * driScrnPriv,
 331                   __DRIdrawablePrivate * driDrawPriv,
 332                   const __GLcontextModes * mesaVis, GLboolean isPixmap)
 333 {
 334    if (isPixmap) {
 335       return GL_FALSE;          /* not implemented */
 336    }
 337    else {
 338       GLboolean swStencil = (mesaVis->stencilBits > 0 &&
 339                              mesaVis->depthBits != 24);
 340       GLenum rgbFormat;
 341
 342       struct intel_framebuffer *intel_fb = CALLOC_STRUCT(intel_framebuffer);
 343
 344       if (!intel_fb)
 345          return GL_FALSE;
 346
 347       _mesa_initialize_framebuffer(&intel_fb->Base, mesaVis);
 348
 349       if (mesaVis->redBits == 5)
 350          rgbFormat = GL_RGB5;
 351       else if (mesaVis->alphaBits == 0)
 352          rgbFormat = GL_RGB8;
 353       else
 354          rgbFormat = GL_RGBA8;
 355
 356       /* setup the hardware-based renderbuffers */
 357       intel_fb->color_rb[0] = intel_create_renderbuffer(rgbFormat);
 358       _mesa_add_renderbuffer(&intel_fb->Base, BUFFER_FRONT_LEFT,
 359                              &intel_fb->color_rb[0]->Base);
 360
 361       if (mesaVis->doubleBufferMode) {
 362          intel_fb->color_rb[1] = intel_create_renderbuffer(rgbFormat);
 363
 364          _mesa_add_renderbuffer(&intel_fb->Base, BUFFER_BACK_LEFT,
 365                                 &intel_fb->color_rb[1]->Base);
 366
 367       }
 368
 369       if (mesaVis->depthBits == 24) {
 370          if (mesaVis->stencilBits == 8) {
 371             /* combined depth/stencil buffer */
 372             struct intel_renderbuffer *depthStencilRb
 373                = intel_create_renderbuffer(GL_DEPTH24_STENCIL8_EXT);
 374             /* note: bind RB to two attachment points */
 375             _mesa_add_renderbuffer(&intel_fb->Base, BUFFER_DEPTH,
 376                                    &depthStencilRb->Base);
 377             _mesa_add_renderbuffer(&intel_fb->Base, BUFFER_STENCIL,
 378                                    &depthStencilRb->Base);
 379          } else {
 380             struct intel_renderbuffer *depthRb
 381                = intel_create_renderbuffer(GL_DEPTH_COMPONENT24);
 382             _mesa_add_renderbuffer(&intel_fb->Base, BUFFER_DEPTH,
 383                                    &depthRb->Base);
 384          }
 385       }
 386       else if (mesaVis->depthBits == 16) {
 387          /* just 16-bit depth buffer, no hw stencil */
 388          struct intel_renderbuffer *depthRb
 389             = intel_create_renderbuffer(GL_DEPTH_COMPONENT16);
 390          _mesa_add_renderbuffer(&intel_fb->Base, BUFFER_DEPTH, &depthRb->Base);
 391       }
 392
 393       /* now add any/all software-based renderbuffers we may need */
 394       _mesa_add_soft_renderbuffers(&intel_fb->Base,
 395                                    GL_FALSE, /* never sw color */
 396                                    GL_FALSE, /* never sw depth */
 397                                    swStencil, mesaVis->accumRedBits > 0,
 398                                    GL_FALSE, /* never sw alpha */
 399                                    GL_FALSE  /* never sw aux */ );
 400       driDrawPriv->driverPrivate = (void *) intel_fb;
 401
 402       return GL_TRUE;
 403    }
 404 }
 405
 406 static void
 407 intelDestroyBuffer(__DRIdrawablePrivate * driDrawPriv)
 408 {
 409    _mesa_reference_framebuffer((GLframebuffer **)(&(driDrawPriv->driverPrivate)), NULL);
 410 }
 411
 412
 413 /**
 414  * Get information about previous buffer swaps.
 415  */
 416 static int
 417 intelGetSwapInfo(__DRIdrawablePrivate * dPriv, __DRIswapInfo * sInfo)
 418 {
 419    struct intel_framebuffer *intel_fb;
 420
 421    if ((dPriv == NULL) || (dPriv->driverPrivate == NULL)
 422        || (sInfo == NULL)) {
 423       return -1;
 424    }
 425
 426    intel_fb = dPriv->driverPrivate;
 427    sInfo->swap_count = intel_fb->swap_count;
 428    sInfo->swap_ust = intel_fb->swap_ust;
 429    sInfo->swap_missed_count = intel_fb->swap_missed_count;
 430
 431    sInfo->swap_missed_usage = (sInfo->swap_missed_count != 0)
 432       ? driCalculateSwapUsage(dPriv, 0, intel_fb->swap_missed_ust)
 433       : 0.0;
 434
 435    return 0;
 436 }
 437
 438
 439 /* There are probably better ways to do this, such as an
 440  * init-designated function to register chipids and createcontext
 441  * functions.
 442  */
 443 extern GLboolean i830CreateContext(const __GLcontextModes * mesaVis,
 444                                    __DRIcontextPrivate * driContextPriv,
 445                                    void *sharedContextPrivate);
 446
 447 extern GLboolean i915CreateContext(const __GLcontextModes * mesaVis,
 448                                    __DRIcontextPrivate * driContextPriv,
 449                                    void *sharedContextPrivate);
 450 extern GLboolean brwCreateContext(const __GLcontextModes * mesaVis,
 451                                   __DRIcontextPrivate * driContextPriv,
 452                                   void *sharedContextPrivate);
 453
 454 static GLboolean
 455 intelCreateContext(const __GLcontextModes * mesaVis,
 456                    __DRIcontextPrivate * driContextPriv,
 457                    void *sharedContextPrivate)
 458 {
 459    __DRIscreenPrivate *sPriv = driContextPriv->driScreenPriv;
 460    intelScreenPrivate *intelScreen = (intelScreenPrivate *) sPriv->private;
 461
 462 #ifdef I915
 463    if (IS_9XX(intelScreen->deviceID)) {
 464       if (!IS_965(intelScreen->deviceID)) {
 465          return i915CreateContext(mesaVis, driContextPriv,
 466                                   sharedContextPrivate);
 467       }
 468    } else {
 469       intelScreen->no_vbo = GL_TRUE;
 470       return i830CreateContext(mesaVis, driContextPriv, sharedContextPrivate);
 471    }
 472 #else
 473    if (IS_965(intelScreen->deviceID))
 474       return brwCreateContext(mesaVis, driContextPriv, sharedContextPrivate);
 475 #endif
 476    fprintf(stderr, "Unrecognized deviceID %x\n", intelScreen->deviceID);
 477    return GL_FALSE;
 478 }
 479
 480
 481 static __DRIconfig **
 482 intelFillInModes(__DRIscreenPrivate *psp,
 483                  unsigned pixel_bits, unsigned depth_bits,
 484                  unsigned stencil_bits, GLboolean have_back_buffer)
 485 {
 486    __DRIconfig **configs;
 487    __GLcontextModes *m;
 488    unsigned depth_buffer_factor;
 489    unsigned back_buffer_factor;
 490    int i;
 491
 492    /* GLX_SWAP_COPY_OML is only supported because the Intel driver doesn't
 493     * support pageflipping at all.
 494     */
 495    static const GLenum back_buffer_modes[] = {
 496       GLX_NONE, GLX_SWAP_UNDEFINED_OML, GLX_SWAP_COPY_OML
 497    };
 498
 499    uint8_t depth_bits_array[3];
 500    uint8_t stencil_bits_array[3];
 501    uint8_t msaa_samples_array[1];
 502
 503    depth_bits_array[0] = 0;
 504    depth_bits_array[1] = depth_bits;
 505    depth_bits_array[2] = depth_bits;
 506
 507    /* Just like with the accumulation buffer, always provide some modes
 508     * with a stencil buffer.  It will be a sw fallback, but some apps won't
 509     * care about that.
 510     */
 511    stencil_bits_array[0] = 0;
 512    stencil_bits_array[1] = 0;
 513    if (depth_bits == 24)
 514       stencil_bits_array[1] = (stencil_bits == 0) ? 8 : stencil_bits;
 515
 516    stencil_bits_array[2] = (stencil_bits == 0) ? 8 : stencil_bits;
 517
 518    msaa_samples_array[0] = 0;
 519
 520    depth_buffer_factor = ((depth_bits != 0) || (stencil_bits != 0)) ? 3 : 1;
 521    back_buffer_factor = (have_back_buffer) ? 3 : 1;
 522
 523    if (pixel_bits == 16) {
 524       configs = driCreateConfigs(GL_RGB, GL_UNSIGNED_SHORT_5_6_5,
 525                                  depth_bits_array, stencil_bits_array,
 526                                  depth_buffer_factor, back_buffer_modes,
 527                                  back_buffer_factor,
 528                                  msaa_samples_array, 1);
 529    }
 530    else {
 531       __DRIconfig **configs_a8r8g8b8;
 532       __DRIconfig **configs_x8r8g8b8;
 533
 534       configs_a8r8g8b8 = driCreateConfigs(GL_BGRA, GL_UNSIGNED_INT_8_8_8_8_REV,
 535                                           depth_bits_array,
 536                                           stencil_bits_array,
 537                                           depth_buffer_factor,
 538                                           back_buffer_modes,
 539                                           back_buffer_factor,
 540                                           msaa_samples_array, 1);
 541       configs_x8r8g8b8 = driCreateConfigs(GL_BGR, GL_UNSIGNED_INT_8_8_8_8_REV,
 542                                           depth_bits_array,
 543                                           stencil_bits_array,
 544                                           depth_buffer_factor,
 545                                           back_buffer_modes,
 546                                           back_buffer_factor,
 547                                           msaa_samples_array, 1);
 548       configs = driConcatConfigs(configs_a8r8g8b8, configs_x8r8g8b8);
 549    }
 550
 551    if (configs == NULL) {
 552     fprintf(stderr, "[%s:%u] Error creating FBConfig!\n", __func__,
 553               __LINE__);
 554       return NULL;
 555    }
 556
 557    /* Mark the visual as slow if there are "fake" stencil bits.
 558     */
 559    for (i = 0; configs[i]; i++) {
 560       m = &configs[i]->modes;
 561       if ((m->stencilBits != 0) && (m->stencilBits != stencil_bits)) {
 562          m->visualRating = GLX_SLOW_CONFIG;
 563       }
 564    }
 565
 566    return configs;
 567 }
 568
 569 static GLboolean
 570 intel_init_bufmgr(intelScreenPrivate *intelScreen)
 571 {
 572    GLboolean gem_disable = getenv("INTEL_NO_GEM") != NULL;
 573    int gem_kernel = 0;
 574    GLboolean gem_supported;
 575    struct drm_i915_getparam gp;
 576    __DRIscreenPrivate *spriv = intelScreen->driScrnPriv;
 577    int num_fences;
 578
 579    intelScreen->no_hw = getenv("INTEL_NO_HW") != NULL;
 580
 581    gp.param = I915_PARAM_HAS_GEM;
 582    gp.value = &gem_kernel;
 583
 584    (void) drmCommandWriteRead(spriv->fd, DRM_I915_GETPARAM, &gp, sizeof(gp));
 585
 586    /* If we've got a new enough DDX that's initializing GEM and giving us
 587     * object handles for the shared buffers, use that.
 588     */
 589    intelScreen->ttm = GL_FALSE;
 590    if (intelScreen->driScrnPriv->dri2.enabled)
 591        gem_supported = GL_TRUE;
 592    else if (intelScreen->driScrnPriv->ddx_version.minor >= 9 &&
 593             gem_kernel &&
 594             intelScreen->front.bo_handle != -1)
 595        gem_supported = GL_TRUE;
 596    else
 597        gem_supported = GL_FALSE;
 598
 599    if (!gem_disable && gem_supported) {
 600       intelScreen->bufmgr = intel_bufmgr_gem_init(spriv->fd, BATCH_SZ);
 601       if (intelScreen->bufmgr != NULL)
 602          intelScreen->ttm = GL_TRUE;
 603    }
 604    /* Otherwise, use the classic buffer manager. */
 605    if (intelScreen->bufmgr == NULL) {
 606       if (gem_disable) {
 607          fprintf(stderr, "GEM disabled.  Using classic.\n");
 608       } else {
 609          fprintf(stderr, "Failed to initialize GEM.  "
 610                  "Falling back to classic.\n");
 611       }
 612
 613       if (intelScreen->tex.size == 0) {
 614          fprintf(stderr, "[%s:%u] Error initializing buffer manager.\n",
 615                  __func__, __LINE__);
 616          return GL_FALSE;
 617       }
 618
 619       intelScreen->bufmgr =
 620          intel_bufmgr_fake_init(spriv->fd,
 621                                 intelScreen->tex.offset,
 622                                 intelScreen->tex.map,
 623                                 intelScreen->tex.size,
 624                                 (unsigned int * volatile)
 625                                 &intelScreen->sarea->last_dispatch);
 626    }
 627
 628    if (intel_get_param(spriv, I915_PARAM_NUM_FENCES_AVAIL, &num_fences))
 629       intelScreen->kernel_exec_fencing = !!num_fences;
 630    else
 631       intelScreen->kernel_exec_fencing = GL_FALSE;
 632
 633    return GL_TRUE;
 634 }
 635
 636 /**
 637  * This is the driver specific part of the createNewScreen entry point.
 638  * Called when using legacy DRI.
 639  *
 640  * \todo maybe fold this into intelInitDriver
 641  *
 642  * \return the __GLcontextModes supported by this driver
 643  */
 644 static const __DRIconfig **intelInitScreen(__DRIscreenPrivate *psp)
 645 {
 646    intelScreenPrivate *intelScreen;
 647 #ifdef I915
 648    static const __DRIversion ddx_expected = { 1, 5, 0 };
 649 #else
 650    static const __DRIversion ddx_expected = { 1, 6, 0 };
 651 #endif
 652    static const __DRIversion dri_expected = { 4, 0, 0 };
 653    static const __DRIversion drm_expected = { 1, 5, 0 };
 654    I830DRIPtr dri_priv = (I830DRIPtr) psp->pDevPriv;
 655
 656    if (!driCheckDriDdxDrmVersions2("i915",
 657                                    &psp->dri_version, &dri_expected,
 658                                    &psp->ddx_version, &ddx_expected,
 659                                    &psp->drm_version, &drm_expected)) {
 660       return NULL;
 661    }
 662
 663    /* Calling driInitExtensions here, with a NULL context pointer,
 664     * does not actually enable the extensions.  It just makes sure
 665     * that all the dispatch offsets for all the extensions that
 666     * *might* be enables are known.  This is needed because the
 667     * dispatch offsets need to be known when _mesa_context_create is
 668     * called, but we can't enable the extensions until we have a
 669     * context pointer.
 670     *
 671     * Hello chicken.  Hello egg.  How are you two today?
 672     */
 673    intelInitExtensions(NULL, GL_TRUE);
 674
 675    if (!intelInitDriver(psp))
 676        return NULL;
 677
 678    psp->extensions = intelScreenExtensions;
 679
 680    intelScreen = psp->private;
 681    if (!intel_init_bufmgr(intelScreen))
 682        return GL_FALSE;
 683
 684    return (const __DRIconfig **)
 685        intelFillInModes(psp, dri_priv->cpp * 8,
 686                         (dri_priv->cpp == 2) ? 16 : 24,
 687                         (dri_priv->cpp == 2) ? 0  : 8, 1);
 688 }
 689
 690 struct intel_context *intelScreenContext(intelScreenPrivate *intelScreen)
 691 {
 692   /*
 693    * This should probably change to have the screen allocate a dummy
 694    * context at screen creation. For now just use the current context.
 695    */
 696
 697   GET_CURRENT_CONTEXT(ctx);
 698   if (ctx == NULL) {
 699      _mesa_problem(NULL, "No current context in intelScreenContext\n");
 700      return NULL;
 701   }
 702   return intel_context(ctx);
 703 }
 704
 705 /**
 706  * This is the driver specific part of the createNewScreen entry point.
 707  * Called when using DRI2.
 708  *
 709  * \return the __GLcontextModes supported by this driver
 710  */
 711 static const
 712 __DRIconfig **intelInitScreen2(__DRIscreenPrivate *psp)
 713 {
 714    intelScreenPrivate *intelScreen;
 715    GLenum fb_format[3];
 716    GLenum fb_type[3];
 717    /* GLX_SWAP_COPY_OML is only supported because the Intel driver doesn't
 718     * support pageflipping at all.
 719     */
 720    static const GLenum back_buffer_modes[] = {
 721       GLX_NONE, GLX_SWAP_UNDEFINED_OML, GLX_SWAP_COPY_OML
 722    };
 723    uint8_t depth_bits[4], stencil_bits[4], msaa_samples_array[1];
 724    int color;
 725    __DRIconfig **configs = NULL;
 726
 727    /* Calling driInitExtensions here, with a NULL context pointer,
 728     * does not actually enable the extensions.  It just makes sure
 729     * that all the dispatch offsets for all the extensions that
 730     * *might* be enables are known.  This is needed because the
 731     * dispatch offsets need to be known when _mesa_context_create is
 732     * called, but we can't enable the extensions until we have a
 733     * context pointer.
 734     *
 735     * Hello chicken.  Hello egg.  How are you two today?
 736     */
 737    intelInitExtensions(NULL, GL_TRUE);
 738
 739    /* Allocate the private area */
 740    intelScreen = (intelScreenPrivate *) CALLOC(sizeof(intelScreenPrivate));
 741    if (!intelScreen) {
 742       fprintf(stderr, "\nERROR!  Allocating private area failed\n");
 743       return GL_FALSE;
 744    }
 745    /* parse information in __driConfigOptions */
 746    driParseOptionInfo(&intelScreen->optionCache,
 747                       __driConfigOptions, __driNConfigOptions);
 748
 749    intelScreen->driScrnPriv = psp;
 750    psp->private = (void *) intelScreen;
 751
 752    intelScreen->drmMinor = psp->drm_version.minor;
 753
 754    /* Determine chipset ID */
 755    if (!intel_get_param(psp, I915_PARAM_CHIPSET_ID,
 756                         &intelScreen->deviceID))
 757       return GL_FALSE;
 758
 759    if (!intel_init_bufmgr(intelScreen))
 760        return GL_FALSE;
 761
 762    intelScreen->irq_active = 1;
 763    psp->extensions = intelScreenExtensions;
 764
 765    depth_bits[0] = 0;
 766    stencil_bits[0] = 0;
 767    depth_bits[1] = 16;
 768    stencil_bits[1] = 0;
 769    depth_bits[2] = 24;
 770    stencil_bits[2] = 0;
 771    depth_bits[3] = 24;
 772    stencil_bits[3] = 8;
 773
 774    msaa_samples_array[0] = 0;
 775
 776    fb_format[0] = GL_RGB;
 777    fb_type[0] = GL_UNSIGNED_SHORT_5_6_5;
 778
 779    fb_format[1] = GL_BGR;
 780    fb_type[1] = GL_UNSIGNED_INT_8_8_8_8_REV;
 781
 782    fb_format[2] = GL_BGRA;
 783    fb_type[2] = GL_UNSIGNED_INT_8_8_8_8_REV;
 784
 785    depth_bits[0] = 0;
 786    stencil_bits[0] = 0;
 787
 788    for (color = 0; color < ARRAY_SIZE(fb_format); color++) {
 789       __DRIconfig **new_configs;
 790       int depth_factor;
 791
 792       /* With DRI2 right now, GetBuffers always returns a depth/stencil buffer
 793        * with the same cpp as the drawable.  So we can't support depth cpp !=
 794        * color cpp currently.
 795        */
 796       if (fb_type[color] == GL_UNSIGNED_SHORT_5_6_5) {
 797          depth_bits[1] = 16;
 798          stencil_bits[1] = 0;
 799
 800          depth_factor = 2;
 801       } else {
 802          depth_bits[1] = 24;
 803          stencil_bits[1] = 0;
 804          depth_bits[2] = 24;
 805          stencil_bits[2] = 8;
 806
 807          depth_factor = 3;
 808       }
 809       new_configs = driCreateConfigs(fb_format[color], fb_type[color],
 810                                      depth_bits,
 811                                      stencil_bits,
 812                                      depth_factor,
 813                                      back_buffer_modes,
 814                                      ARRAY_SIZE(back_buffer_modes),
 815                                      msaa_samples_array,
 816                                      ARRAY_SIZE(msaa_samples_array));
 817       if (configs == NULL)
 818          configs = new_configs;
 819       else
 820          configs = driConcatConfigs(configs, new_configs);
 821    }
 822
 823    if (configs == NULL) {
 824       fprintf(stderr, "[%s:%u] Error creating FBConfig!\n", __func__,
 825               __LINE__);
 826       return NULL;
 827    }
 828
 829    return (const __DRIconfig **)configs;
 830 }
 831
 832 const struct __DriverAPIRec driDriverAPI = {
 833    .InitScreen           = intelInitScreen,
 834    .DestroyScreen        = intelDestroyScreen,
 835    .CreateContext        = intelCreateContext,
 836    .DestroyContext       = intelDestroyContext,
 837    .CreateBuffer         = intelCreateBuffer,
 838    .DestroyBuffer        = intelDestroyBuffer,
 839    .SwapBuffers          = intelSwapBuffers,
 840    .MakeCurrent          = intelMakeCurrent,
 841    .UnbindContext        = intelUnbindContext,
 842    .GetSwapInfo          = intelGetSwapInfo,
 843    .GetDrawableMSC       = driDrawableGetMSC32,
 844    .WaitForMSC           = driWaitForMSC32,
 845    .CopySubBuffer        = intelCopySubBuffer,
 846
 847    .InitScreen2          = intelInitScreen2,
 848 };