src/mesa/drivers/dri/intel/intel_context.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
  29 #include "main/glheader.h"
  30 #include "main/context.h"
  31 #include "main/extensions.h"
  32 #include "main/fbobject.h"
  33 #include "main/framebuffer.h"
  34 #include "main/imports.h"
  35 #include "main/points.h"
  36 #include "main/renderbuffer.h"
  37
  38 #include "swrast/swrast.h"
  39 #include "swrast_setup/swrast_setup.h"
  40 #include "tnl/tnl.h"
  41 #include "drivers/common/driverfuncs.h"
  42 #include "drivers/common/meta.h"
  43
  44 #include "intel_chipset.h"
  45 #include "intel_buffers.h"
  46 #include "intel_tex.h"
  47 #include "intel_batchbuffer.h"
  48 #include "intel_clear.h"
  49 #include "intel_extensions.h"
  50 #include "intel_pixel.h"
  51 #include "intel_regions.h"
  52 #include "intel_buffer_objects.h"
  53 #include "intel_fbo.h"
  54 #include "intel_bufmgr.h"
  55 #include "intel_screen.h"
  56
  57 #include "drirenderbuffer.h"
  58 #include "utils.h"
  59
  60
  61 #ifndef INTEL_DEBUG
  62 int INTEL_DEBUG = (0);
  63 #endif
  64
  65
  66 static const GLubyte *
  67 intelGetString(struct gl_context * ctx, GLenum name)
  68 {
  69    const struct intel_context *const intel = intel_context(ctx);
  70    const char *chipset;
  71    static char buffer[128];
  72
  73    switch (name) {
  74    case GL_VENDOR:
  75       return (GLubyte *) "Tungsten Graphics, Inc";
  76       break;
  77
  78    case GL_RENDERER:
  79       switch (intel->intelScreen->deviceID) {
  80       case PCI_CHIP_845_G:
  81          chipset = "Intel(R) 845G";
  82          break;
  83       case PCI_CHIP_I830_M:
  84          chipset = "Intel(R) 830M";
  85          break;
  86       case PCI_CHIP_I855_GM:
  87          chipset = "Intel(R) 852GM/855GM";
  88          break;
  89       case PCI_CHIP_I865_G:
  90          chipset = "Intel(R) 865G";
  91          break;
  92       case PCI_CHIP_I915_G:
  93          chipset = "Intel(R) 915G";
  94          break;
  95       case PCI_CHIP_E7221_G:
  96          chipset = "Intel (R) E7221G (i915)";
  97          break;
  98       case PCI_CHIP_I915_GM:
  99          chipset = "Intel(R) 915GM";
 100          break;
 101       case PCI_CHIP_I945_G:
 102          chipset = "Intel(R) 945G";
 103          break;
 104       case PCI_CHIP_I945_GM:
 105          chipset = "Intel(R) 945GM";
 106          break;
 107       case PCI_CHIP_I945_GME:
 108          chipset = "Intel(R) 945GME";
 109          break;
 110       case PCI_CHIP_G33_G:
 111          chipset = "Intel(R) G33";
 112          break;
 113       case PCI_CHIP_Q35_G:
 114          chipset = "Intel(R) Q35";
 115          break;
 116       case PCI_CHIP_Q33_G:
 117          chipset = "Intel(R) Q33";
 118          break;
 119       case PCI_CHIP_IGD_GM:
 120       case PCI_CHIP_IGD_G:
 121          chipset = "Intel(R) IGD";
 122          break;
 123       case PCI_CHIP_I965_Q:
 124          chipset = "Intel(R) 965Q";
 125          break;
 126       case PCI_CHIP_I965_G:
 127       case PCI_CHIP_I965_G_1:
 128          chipset = "Intel(R) 965G";
 129          break;
 130       case PCI_CHIP_I946_GZ:
 131          chipset = "Intel(R) 946GZ";
 132          break;
 133       case PCI_CHIP_I965_GM:
 134          chipset = "Intel(R) 965GM";
 135          break;
 136       case PCI_CHIP_I965_GME:
 137          chipset = "Intel(R) 965GME/GLE";
 138          break;
 139       case PCI_CHIP_GM45_GM:
 140          chipset = "Mobile Intel® GM45 Express Chipset";
 141          break;
 142       case PCI_CHIP_IGD_E_G:
 143          chipset = "Intel(R) Integrated Graphics Device";
 144          break;
 145       case PCI_CHIP_G45_G:
 146          chipset = "Intel(R) G45/G43";
 147          break;
 148       case PCI_CHIP_Q45_G:
 149          chipset = "Intel(R) Q45/Q43";
 150          break;
 151       case PCI_CHIP_G41_G:
 152          chipset = "Intel(R) G41";
 153          break;
 154       case PCI_CHIP_B43_G:
 155       case PCI_CHIP_B43_G1:
 156          chipset = "Intel(R) B43";
 157          break;
 158       case PCI_CHIP_ILD_G:
 159          chipset = "Intel(R) Ironlake Desktop";
 160          break;
 161       case PCI_CHIP_ILM_G:
 162          chipset = "Intel(R) Ironlake Mobile";
 163          break;
 164       case PCI_CHIP_SANDYBRIDGE_GT1:
 165       case PCI_CHIP_SANDYBRIDGE_GT2:
 166       case PCI_CHIP_SANDYBRIDGE_GT2_PLUS:
 167          chipset = "Intel(R) Sandybridge Desktop";
 168          break;
 169       case PCI_CHIP_SANDYBRIDGE_M_GT1:
 170       case PCI_CHIP_SANDYBRIDGE_M_GT2:
 171       case PCI_CHIP_SANDYBRIDGE_M_GT2_PLUS:
 172          chipset = "Intel(R) Sandybridge Mobile";
 173          break;
 174       case PCI_CHIP_SANDYBRIDGE_S:
 175          chipset = "Intel(R) Sandybridge Server";
 176          break;
 177       case PCI_CHIP_IVYBRIDGE_GT1:
 178       case PCI_CHIP_IVYBRIDGE_GT2:
 179          chipset = "Intel(R) Ivybridge Desktop";
 180          break;
 181       case PCI_CHIP_IVYBRIDGE_M_GT1:
 182       case PCI_CHIP_IVYBRIDGE_M_GT2:
 183          chipset = "Intel(R) Ivybridge Mobile";
 184          break;
 185       case PCI_CHIP_IVYBRIDGE_S_GT1:
 186          chipset = "Intel(R) Ivybridge Server";
 187          break;
 188       default:
 189          chipset = "Unknown Intel Chipset";
 190          break;
 191       }
 192
 193       (void) driGetRendererString(buffer, chipset, 0);
 194       return (GLubyte *) buffer;
 195
 196    default:
 197       return NULL;
 198    }
 199 }
 200
 201 static void
 202 intel_flush_front(struct gl_context *ctx)
 203 {
 204    struct intel_context *intel = intel_context(ctx);
 205     __DRIcontext *driContext = intel->driContext;
 206     __DRIscreen *const screen = intel->intelScreen->driScrnPriv;
 207
 208    if ((ctx->DrawBuffer->Name == 0) && intel->front_buffer_dirty) {
 209       if (screen->dri2.loader &&
 210           (screen->dri2.loader->base.version >= 2)
 211           && (screen->dri2.loader->flushFrontBuffer != NULL) &&
 212           driContext->driDrawablePriv &&
 213           driContext->driDrawablePriv->loaderPrivate) {
 214          (*screen->dri2.loader->flushFrontBuffer)(driContext->driDrawablePriv,
 215                                                   driContext->driDrawablePriv->loaderPrivate);
 216
 217          /* We set the dirty bit in intel_prepare_render() if we're
 218           * front buffer rendering once we get there.
 219           */
 220          intel->front_buffer_dirty = GL_FALSE;
 221       }
 222    }
 223 }
 224
 225 static unsigned
 226 intel_bits_per_pixel(const struct intel_renderbuffer *rb)
 227 {
 228    return _mesa_get_format_bytes(rb->Base.Format) * 8;
 229 }
 230
 231 static void
 232 intel_query_dri2_buffers_no_separate_stencil(struct intel_context *intel,
 233                                              __DRIdrawable *drawable,
 234                                              __DRIbuffer **buffers,
 235                                              int *count);
 236
 237 static void
 238 intel_process_dri2_buffer_no_separate_stencil(struct intel_context *intel,
 239                                               __DRIdrawable *drawable,
 240                                               __DRIbuffer *buffer,
 241                                               struct intel_renderbuffer *rb,
 242                                               const char *buffer_name);
 243
 244 static void
 245 intel_query_dri2_buffers_with_separate_stencil(struct intel_context *intel,
 246                                                __DRIdrawable *drawable,
 247                                                __DRIbuffer **buffers,
 248                                                unsigned **attachments,
 249                                                int *count);
 250
 251 static void
 252 intel_process_dri2_buffer_with_separate_stencil(struct intel_context *intel,
 253                                                 __DRIdrawable *drawable,
 254                                                 __DRIbuffer *buffer,
 255                                                 struct intel_renderbuffer *rb,
 256                                                 const char *buffer_name);
 257 static void
 258 intel_verify_dri2_has_hiz(struct intel_context *intel,
 259                           __DRIdrawable *drawable,
 260                           __DRIbuffer **buffers,
 261                           unsigned **attachments,
 262                           int *count);
 263
 264 void
 265 intel_update_renderbuffers(__DRIcontext *context, __DRIdrawable *drawable)
 266 {
 267    struct gl_framebuffer *fb = drawable->driverPrivate;
 268    struct intel_renderbuffer *rb;
 269    struct intel_context *intel = context->driverPrivate;
 270    __DRIbuffer *buffers = NULL;
 271    unsigned *attachments = NULL;
 272    int i, count;
 273    const char *region_name;
 274
 275    bool try_separate_stencil =
 276       intel->has_separate_stencil &&
 277       intel->intelScreen->dri2_has_hiz != INTEL_DRI2_HAS_HIZ_FALSE &&
 278       intel->intelScreen->driScrnPriv->dri2.loader != NULL &&
 279       intel->intelScreen->driScrnPriv->dri2.loader->base.version > 2 &&
 280       intel->intelScreen->driScrnPriv->dri2.loader->getBuffersWithFormat != NULL;
 281
 282    assert(!intel->must_use_separate_stencil || try_separate_stencil);
 283
 284    /* If we're rendering to the fake front buffer, make sure all the
 285     * pending drawing has landed on the real front buffer.  Otherwise
 286     * when we eventually get to DRI2GetBuffersWithFormat the stale
 287     * real front buffer contents will get copied to the new fake front
 288     * buffer.
 289     */
 290    if (intel->is_front_buffer_rendering) {
 291       intel_flush(&intel->ctx);
 292       intel_flush_front(&intel->ctx);
 293    }
 294
 295    /* Set this up front, so that in case our buffers get invalidated
 296     * while we're getting new buffers, we don't clobber the stamp and
 297     * thus ignore the invalidate. */
 298    drawable->lastStamp = drawable->dri2.stamp;
 299
 300    if (unlikely(INTEL_DEBUG & DEBUG_DRI))
 301       fprintf(stderr, "enter %s, drawable %p\n", __func__, drawable);
 302
 303    if (try_separate_stencil) {
 304       intel_query_dri2_buffers_with_separate_stencil(intel, drawable, &buffers,
 305                                                      &attachments, &count);
 306    } else {
 307       intel_query_dri2_buffers_no_separate_stencil(intel, drawable, &buffers,
 308                                                    &count);
 309    }
 310
 311    if (buffers == NULL)
 312       return;
 313
 314    drawable->x = 0;
 315    drawable->y = 0;
 316    drawable->backX = 0;
 317    drawable->backY = 0;
 318    drawable->numClipRects = 1;
 319    drawable->pClipRects[0].x1 = 0;
 320    drawable->pClipRects[0].y1 = 0;
 321    drawable->pClipRects[0].x2 = drawable->w;
 322    drawable->pClipRects[0].y2 = drawable->h;
 323    drawable->numBackClipRects = 1;
 324    drawable->pBackClipRects[0].x1 = 0;
 325    drawable->pBackClipRects[0].y1 = 0;
 326    drawable->pBackClipRects[0].x2 = drawable->w;
 327    drawable->pBackClipRects[0].y2 = drawable->h;
 328
 329    for (i = 0; i < count; i++) {
 330        switch (buffers[i].attachment) {
 331        case __DRI_BUFFER_FRONT_LEFT:
 332            rb = intel_get_renderbuffer(fb, BUFFER_FRONT_LEFT);
 333            region_name = "dri2 front buffer";
 334            break;
 335
 336        case __DRI_BUFFER_FAKE_FRONT_LEFT:
 337            rb = intel_get_renderbuffer(fb, BUFFER_FRONT_LEFT);
 338            region_name = "dri2 fake front buffer";
 339            break;
 340
 341        case __DRI_BUFFER_BACK_LEFT:
 342            rb = intel_get_renderbuffer(fb, BUFFER_BACK_LEFT);
 343            region_name = "dri2 back buffer";
 344            break;
 345
 346        case __DRI_BUFFER_DEPTH:
 347            rb = intel_get_renderbuffer(fb, BUFFER_DEPTH);
 348            region_name = "dri2 depth buffer";
 349            break;
 350
 351        case __DRI_BUFFER_HIZ:
 352            /* The hiz region resides in the depth renderbuffer. */
 353            rb = intel_get_renderbuffer(fb, BUFFER_DEPTH);
 354            region_name = "dri2 hiz buffer";
 355            break;
 356
 357        case __DRI_BUFFER_DEPTH_STENCIL:
 358            rb = intel_get_renderbuffer(fb, BUFFER_DEPTH);
 359            region_name = "dri2 depth / stencil buffer";
 360            break;
 361
 362        case __DRI_BUFFER_STENCIL:
 363            rb = intel_get_renderbuffer(fb, BUFFER_STENCIL);
 364            region_name = "dri2 stencil buffer";
 365            break;
 366
 367        case __DRI_BUFFER_ACCUM:
 368        default:
 369            fprintf(stderr,
 370                    "unhandled buffer attach event, attachment type %d\n",
 371                    buffers[i].attachment);
 372            return;
 373        }
 374
 375        if (try_separate_stencil) {
 376          intel_process_dri2_buffer_with_separate_stencil(intel, drawable,
 377                                                          &buffers[i], rb,
 378                                                          region_name);
 379        } else {
 380          intel_process_dri2_buffer_no_separate_stencil(intel, drawable,
 381                                                        &buffers[i], rb,
 382                                                        region_name);
 383        }
 384    }
 385
 386    if (try_separate_stencil
 387        && intel->intelScreen->dri2_has_hiz == INTEL_DRI2_HAS_HIZ_UNKNOWN) {
 388       intel_verify_dri2_has_hiz(intel, drawable, &buffers, &attachments,
 389                                 &count);
 390    }
 391
 392    if (attachments)
 393       free(attachments);
 394
 395    driUpdateFramebufferSize(&intel->ctx, drawable);
 396 }
 397
 398 /**
 399  * intel_prepare_render should be called anywhere that curent read/drawbuffer
 400  * state is required.
 401  */
 402 void
 403 intel_prepare_render(struct intel_context *intel)
 404 {
 405    __DRIcontext *driContext = intel->driContext;
 406    __DRIdrawable *drawable;
 407
 408    drawable = driContext->driDrawablePriv;
 409    if (drawable && drawable->dri2.stamp != driContext->dri2.draw_stamp) {
 410       if (drawable->lastStamp != drawable->dri2.stamp)
 411          intel_update_renderbuffers(driContext, drawable);
 412       intel_draw_buffer(&intel->ctx, intel->ctx.DrawBuffer);
 413       driContext->dri2.draw_stamp = drawable->dri2.stamp;
 414    }
 415
 416    drawable = driContext->driReadablePriv;
 417    if (drawable && drawable->dri2.stamp != driContext->dri2.read_stamp) {
 418       if (drawable->lastStamp != drawable->dri2.stamp)
 419          intel_update_renderbuffers(driContext, drawable);
 420       driContext->dri2.read_stamp = drawable->dri2.stamp;
 421    }
 422
 423    /* If we're currently rendering to the front buffer, the rendering
 424     * that will happen next will probably dirty the front buffer.  So
 425     * mark it as dirty here.
 426     */
 427    if (intel->is_front_buffer_rendering)
 428       intel->front_buffer_dirty = GL_TRUE;
 429
 430    /* Wait for the swapbuffers before the one we just emitted, so we
 431     * don't get too many swaps outstanding for apps that are GPU-heavy
 432     * but not CPU-heavy.
 433     *
 434     * We're using intelDRI2Flush (called from the loader before
 435     * swapbuffer) and glFlush (for front buffer rendering) as the
 436     * indicator that a frame is done and then throttle when we get
 437     * here as we prepare to render the next frame.  At this point for
 438     * round trips for swap/copy and getting new buffers are done and
 439     * we'll spend less time waiting on the GPU.
 440     *
 441     * Unfortunately, we don't have a handle to the batch containing
 442     * the swap, and getting our hands on that doesn't seem worth it,
 443     * so we just us the first batch we emitted after the last swap.
 444     */
 445    if (intel->need_throttle && intel->first_post_swapbuffers_batch) {
 446       drm_intel_bo_wait_rendering(intel->first_post_swapbuffers_batch);
 447       drm_intel_bo_unreference(intel->first_post_swapbuffers_batch);
 448       intel->first_post_swapbuffers_batch = NULL;
 449       intel->need_throttle = GL_FALSE;
 450    }
 451 }
 452
 453 static void
 454 intel_viewport(struct gl_context *ctx, GLint x, GLint y, GLsizei w, GLsizei h)
 455 {
 456     struct intel_context *intel = intel_context(ctx);
 457     __DRIcontext *driContext = intel->driContext;
 458
 459     if (intel->saved_viewport)
 460         intel->saved_viewport(ctx, x, y, w, h);
 461
 462     if (ctx->DrawBuffer->Name == 0) {
 463        dri2InvalidateDrawable(driContext->driDrawablePriv);
 464        dri2InvalidateDrawable(driContext->driReadablePriv);
 465     }
 466 }
 467
 468 static const struct dri_debug_control debug_control[] = {
 469    { "tex",   DEBUG_TEXTURE},
 470    { "state", DEBUG_STATE},
 471    { "ioctl", DEBUG_IOCTL},
 472    { "blit",  DEBUG_BLIT},
 473    { "mip",   DEBUG_MIPTREE},
 474    { "fall",  DEBUG_FALLBACKS},
 475    { "verb",  DEBUG_VERBOSE},
 476    { "bat",   DEBUG_BATCH},
 477    { "pix",   DEBUG_PIXEL},
 478    { "buf",   DEBUG_BUFMGR},
 479    { "reg",   DEBUG_REGION},
 480    { "fbo",   DEBUG_FBO},
 481    { "gs",    DEBUG_GS},
 482    { "sync",  DEBUG_SYNC},
 483    { "prim",  DEBUG_PRIMS },
 484    { "vert",  DEBUG_VERTS },
 485    { "dri",   DEBUG_DRI },
 486    { "sf",    DEBUG_SF },
 487    { "san",   DEBUG_SANITY },
 488    { "sleep", DEBUG_SLEEP },
 489    { "stats", DEBUG_STATS },
 490    { "tile",  DEBUG_TILE },
 491    { "sing",  DEBUG_SINGLE_THREAD },
 492    { "thre",  DEBUG_SINGLE_THREAD },
 493    { "wm",    DEBUG_WM },
 494    { "urb",   DEBUG_URB },
 495    { "vs",    DEBUG_VS },
 496    { "clip",  DEBUG_CLIP },
 497    { NULL,    0 }
 498 };
 499
 500
 501 static void
 502 intelInvalidateState(struct gl_context * ctx, GLuint new_state)
 503 {
 504     struct intel_context *intel = intel_context(ctx);
 505
 506    _swrast_InvalidateState(ctx, new_state);
 507    _vbo_InvalidateState(ctx, new_state);
 508
 509    intel->NewGLState |= new_state;
 510
 511    if (intel->vtbl.invalidate_state)
 512       intel->vtbl.invalidate_state( intel, new_state );
 513 }
 514
 515 void
 516 intel_flush(struct gl_context *ctx)
 517 {
 518    struct intel_context *intel = intel_context(ctx);
 519
 520    if (intel->Fallback)
 521       _swrast_flush(ctx);
 522
 523    if (intel->gen < 4)
 524       INTEL_FIREVERTICES(intel);
 525
 526    if (intel->batch.used)
 527       intel_batchbuffer_flush(intel);
 528 }
 529
 530 static void
 531 intel_glFlush(struct gl_context *ctx)
 532 {
 533    struct intel_context *intel = intel_context(ctx);
 534
 535    intel_flush(ctx);
 536    intel_flush_front(ctx);
 537    if (intel->is_front_buffer_rendering)
 538       intel->need_throttle = GL_TRUE;
 539 }
 540
 541 void
 542 intelFinish(struct gl_context * ctx)
 543 {
 544    struct intel_context *intel = intel_context(ctx);
 545
 546    intel_flush(ctx);
 547    intel_flush_front(ctx);
 548
 549    if (intel->batch.last_bo)
 550       drm_intel_bo_wait_rendering(intel->batch.last_bo);
 551 }
 552
 553 void
 554 intelInitDriverFunctions(struct dd_function_table *functions)
 555 {
 556    _mesa_init_driver_functions(functions);
 557
 558    functions->Flush = intel_glFlush;
 559    functions->Finish = intelFinish;
 560    functions->GetString = intelGetString;
 561    functions->UpdateState = intelInvalidateState;
 562
 563    intelInitTextureFuncs(functions);
 564    intelInitTextureImageFuncs(functions);
 565    intelInitTextureSubImageFuncs(functions);
 566    intelInitTextureCopyImageFuncs(functions);
 567    intelInitStateFuncs(functions);
 568    intelInitClearFuncs(functions);
 569    intelInitBufferFuncs(functions);
 570    intelInitPixelFuncs(functions);
 571    intelInitBufferObjectFuncs(functions);
 572    intel_init_syncobj_functions(functions);
 573 }
 574
 575 GLboolean
 576 intelInitContext(struct intel_context *intel,
 577                  int api,
 578                  const struct gl_config * mesaVis,
 579                  __DRIcontext * driContextPriv,
 580                  void *sharedContextPrivate,
 581                  struct dd_function_table *functions)
 582 {
 583    struct gl_context *ctx = &intel->ctx;
 584    struct gl_context *shareCtx = (struct gl_context *) sharedContextPrivate;
 585    __DRIscreen *sPriv = driContextPriv->driScreenPriv;
 586    struct intel_screen *intelScreen = sPriv->private;
 587    int bo_reuse_mode;
 588    struct gl_config visual;
 589
 590    /* we can't do anything without a connection to the device */
 591    if (intelScreen->bufmgr == NULL)
 592       return GL_FALSE;
 593
 594    /* Can't rely on invalidate events, fall back to glViewport hack */
 595    if (!driContextPriv->driScreenPriv->dri2.useInvalidate) {
 596       intel->saved_viewport = functions->Viewport;
 597       functions->Viewport = intel_viewport;
 598    }
 599
 600    if (mesaVis == NULL) {
 601       memset(&visual, 0, sizeof visual);
 602       mesaVis = &visual;
 603    }
 604
 605    if (!_mesa_initialize_context(&intel->ctx, api, mesaVis, shareCtx,
 606                                  functions, (void *) intel)) {
 607       printf("%s: failed to init mesa context\n", __FUNCTION__);
 608       return GL_FALSE;
 609    }
 610
 611    driContextPriv->driverPrivate = intel;
 612    intel->intelScreen = intelScreen;
 613    intel->driContext = driContextPriv;
 614    intel->driFd = sPriv->fd;
 615
 616    intel->has_xrgb_textures = GL_TRUE;
 617    intel->gen = intelScreen->gen;
 618    if (IS_GEN7(intel->intelScreen->deviceID)) {
 619       intel->needs_ff_sync = GL_TRUE;
 620       intel->has_luminance_srgb = GL_TRUE;
 621    } else if (IS_GEN6(intel->intelScreen->deviceID)) {
 622       intel->needs_ff_sync = GL_TRUE;
 623       intel->has_luminance_srgb = GL_TRUE;
 624    } else if (IS_GEN5(intel->intelScreen->deviceID)) {
 625       intel->needs_ff_sync = GL_TRUE;
 626       intel->has_luminance_srgb = GL_TRUE;
 627    } else if (IS_965(intel->intelScreen->deviceID)) {
 628       if (IS_G4X(intel->intelScreen->deviceID)) {
 629           intel->has_luminance_srgb = GL_TRUE;
 630           intel->is_g4x = GL_TRUE;
 631       }
 632    } else if (IS_9XX(intel->intelScreen->deviceID)) {
 633       if (IS_945(intel->intelScreen->deviceID)) {
 634          intel->is_945 = GL_TRUE;
 635       }
 636    } else {
 637       if (intel->intelScreen->deviceID == PCI_CHIP_I830_M ||
 638           intel->intelScreen->deviceID == PCI_CHIP_845_G) {
 639          intel->has_xrgb_textures = GL_FALSE;
 640       }
 641    }
 642
 643    intel->has_separate_stencil = intel->intelScreen->hw_has_separate_stencil;
 644    intel->must_use_separate_stencil = intel->intelScreen->hw_must_use_separate_stencil;
 645    intel->has_hiz = intel->intelScreen->hw_has_hiz;
 646
 647    memset(&ctx->TextureFormatSupported, 0,
 648           sizeof(ctx->TextureFormatSupported));
 649    ctx->TextureFormatSupported[MESA_FORMAT_ARGB8888] = GL_TRUE;
 650    if (intel->has_xrgb_textures)
 651       ctx->TextureFormatSupported[MESA_FORMAT_XRGB8888] = GL_TRUE;
 652    ctx->TextureFormatSupported[MESA_FORMAT_ARGB4444] = GL_TRUE;
 653    ctx->TextureFormatSupported[MESA_FORMAT_ARGB1555] = GL_TRUE;
 654    ctx->TextureFormatSupported[MESA_FORMAT_RGB565] = GL_TRUE;
 655    ctx->TextureFormatSupported[MESA_FORMAT_L8] = GL_TRUE;
 656    ctx->TextureFormatSupported[MESA_FORMAT_A8] = GL_TRUE;
 657    ctx->TextureFormatSupported[MESA_FORMAT_I8] = GL_TRUE;
 658    ctx->TextureFormatSupported[MESA_FORMAT_AL88] = GL_TRUE;
 659    if (intel->gen >= 4)
 660       ctx->TextureFormatSupported[MESA_FORMAT_AL1616] = GL_TRUE;
 661
 662    /* Depth and stencil */
 663    ctx->TextureFormatSupported[MESA_FORMAT_S8_Z24] = GL_TRUE;
 664    ctx->TextureFormatSupported[MESA_FORMAT_X8_Z24] = GL_TRUE;
 665    ctx->TextureFormatSupported[MESA_FORMAT_S8] = intel->has_separate_stencil;
 666
 667    /*
 668     * This was disabled in initial FBO enabling to avoid combinations
 669     * of depth+stencil that wouldn't work together.  We since decided
 670     * that it was OK, since it's up to the app to come up with the
 671     * combo that actually works, so this can probably be re-enabled.
 672     */
 673    /*
 674    ctx->TextureFormatSupported[MESA_FORMAT_Z16] = GL_TRUE;
 675    ctx->TextureFormatSupported[MESA_FORMAT_Z24] = GL_TRUE;
 676    */
 677
 678    /* ctx->Extensions.MESA_ycbcr_texture */
 679    ctx->TextureFormatSupported[MESA_FORMAT_YCBCR] = GL_TRUE;
 680    ctx->TextureFormatSupported[MESA_FORMAT_YCBCR_REV] = GL_TRUE;
 681
 682    /* GL_3DFX_texture_compression_FXT1 */
 683    ctx->TextureFormatSupported[MESA_FORMAT_RGB_FXT1] = GL_TRUE;
 684    ctx->TextureFormatSupported[MESA_FORMAT_RGBA_FXT1] = GL_TRUE;
 685
 686    /* GL_EXT_texture_compression_s3tc */
 687    ctx->TextureFormatSupported[MESA_FORMAT_RGB_DXT1] = GL_TRUE;
 688    ctx->TextureFormatSupported[MESA_FORMAT_RGBA_DXT1] = GL_TRUE;
 689    ctx->TextureFormatSupported[MESA_FORMAT_RGBA_DXT3] = GL_TRUE;
 690    ctx->TextureFormatSupported[MESA_FORMAT_RGBA_DXT5] = GL_TRUE;
 691
 692 #ifndef I915
 693    /* GL_ARB_texture_compression_rgtc */
 694    ctx->TextureFormatSupported[MESA_FORMAT_RED_RGTC1] = GL_TRUE;
 695    ctx->TextureFormatSupported[MESA_FORMAT_SIGNED_RED_RGTC1] = GL_TRUE;
 696    ctx->TextureFormatSupported[MESA_FORMAT_RG_RGTC2] = GL_TRUE;
 697    ctx->TextureFormatSupported[MESA_FORMAT_SIGNED_RG_RGTC2] = GL_TRUE;
 698
 699    /* GL_ARB_texture_rg */
 700    ctx->TextureFormatSupported[MESA_FORMAT_R8] = GL_TRUE;
 701    ctx->TextureFormatSupported[MESA_FORMAT_R16] = GL_TRUE;
 702    ctx->TextureFormatSupported[MESA_FORMAT_RG88] = GL_TRUE;
 703    ctx->TextureFormatSupported[MESA_FORMAT_RG1616] = GL_TRUE;
 704
 705    /* GL_MESA_texture_signed_rgba / GL_EXT_texture_snorm */
 706    ctx->TextureFormatSupported[MESA_FORMAT_DUDV8] = GL_TRUE;
 707    ctx->TextureFormatSupported[MESA_FORMAT_SIGNED_RGBA8888_REV] = GL_TRUE;
 708    ctx->TextureFormatSupported[MESA_FORMAT_SIGNED_R8] = GL_TRUE;
 709    ctx->TextureFormatSupported[MESA_FORMAT_SIGNED_RG88_REV] = GL_TRUE;
 710    ctx->TextureFormatSupported[MESA_FORMAT_SIGNED_R16] = GL_TRUE;
 711    ctx->TextureFormatSupported[MESA_FORMAT_SIGNED_GR1616] = GL_TRUE;
 712
 713    /* GL_EXT_texture_sRGB */
 714    ctx->TextureFormatSupported[MESA_FORMAT_SARGB8] = GL_TRUE;
 715    if (intel->gen >= 5 || intel->is_g4x)
 716       ctx->TextureFormatSupported[MESA_FORMAT_SRGB_DXT1] = GL_TRUE;
 717    ctx->TextureFormatSupported[MESA_FORMAT_SRGBA_DXT1] = GL_TRUE;
 718    ctx->TextureFormatSupported[MESA_FORMAT_SRGBA_DXT3] = GL_TRUE;
 719    ctx->TextureFormatSupported[MESA_FORMAT_SRGBA_DXT5] = GL_TRUE;
 720    if (intel->has_luminance_srgb) {
 721       ctx->TextureFormatSupported[MESA_FORMAT_SL8] = GL_TRUE;
 722       ctx->TextureFormatSupported[MESA_FORMAT_SLA8] = GL_TRUE;
 723    }
 724
 725 #ifdef TEXTURE_FLOAT_ENABLED
 726    ctx->TextureFormatSupported[MESA_FORMAT_RGBA_FLOAT32] = GL_TRUE;
 727    ctx->TextureFormatSupported[MESA_FORMAT_RG_FLOAT32] = GL_TRUE;
 728    ctx->TextureFormatSupported[MESA_FORMAT_R_FLOAT32] = GL_TRUE;
 729    ctx->TextureFormatSupported[MESA_FORMAT_INTENSITY_FLOAT32] = GL_TRUE;
 730    ctx->TextureFormatSupported[MESA_FORMAT_LUMINANCE_FLOAT32] = GL_TRUE;
 731    ctx->TextureFormatSupported[MESA_FORMAT_ALPHA_FLOAT32] = GL_TRUE;
 732    ctx->TextureFormatSupported[MESA_FORMAT_LUMINANCE_ALPHA_FLOAT32] = GL_TRUE;
 733 #endif
 734
 735 #endif /* !I915 */
 736
 737    driParseConfigFiles(&intel->optionCache, &intelScreen->optionCache,
 738                        sPriv->myNum, (intel->gen >= 4) ? "i965" : "i915");
 739    if (intel->gen < 4)
 740       intel->maxBatchSize = 4096;
 741    else
 742       intel->maxBatchSize = sizeof(intel->batch.map);
 743
 744    intel->bufmgr = intelScreen->bufmgr;
 745
 746    bo_reuse_mode = driQueryOptioni(&intel->optionCache, "bo_reuse");
 747    switch (bo_reuse_mode) {
 748    case DRI_CONF_BO_REUSE_DISABLED:
 749       break;
 750    case DRI_CONF_BO_REUSE_ALL:
 751       intel_bufmgr_gem_enable_reuse(intel->bufmgr);
 752       break;
 753    }
 754
 755    /* This doesn't yet catch all non-conformant rendering, but it's a
 756     * start.
 757     */
 758    if (getenv("INTEL_STRICT_CONFORMANCE")) {
 759       unsigned int value = atoi(getenv("INTEL_STRICT_CONFORMANCE"));
 760       if (value > 0) {
 761          intel->conformance_mode = value;
 762       }
 763       else {
 764          intel->conformance_mode = 1;
 765       }
 766    }
 767
 768    if (intel->conformance_mode > 0) {
 769       ctx->Const.MinLineWidth = 1.0;
 770       ctx->Const.MinLineWidthAA = 1.0;
 771       ctx->Const.MaxLineWidth = 1.0;
 772       ctx->Const.MaxLineWidthAA = 1.0;
 773       ctx->Const.LineWidthGranularity = 1.0;
 774    }
 775    else {
 776       ctx->Const.MinLineWidth = 1.0;
 777       ctx->Const.MinLineWidthAA = 1.0;
 778       ctx->Const.MaxLineWidth = 5.0;
 779       ctx->Const.MaxLineWidthAA = 5.0;
 780       ctx->Const.LineWidthGranularity = 0.5;
 781    }
 782
 783    ctx->Const.MinPointSize = 1.0;
 784    ctx->Const.MinPointSizeAA = 1.0;
 785    ctx->Const.MaxPointSize = 255.0;
 786    ctx->Const.MaxPointSizeAA = 3.0;
 787    ctx->Const.PointSizeGranularity = 1.0;
 788
 789    ctx->Const.MaxSamples = 1.0;
 790
 791    /* reinitialize the context point state.
 792     * It depend on constants in __struct gl_contextRec::Const
 793     */
 794    _mesa_init_point(ctx);
 795
 796    if (intel->gen >= 4) {
 797       ctx->Const.sRGBCapable = GL_TRUE;
 798       if (MAX_WIDTH > 8192)
 799          ctx->Const.MaxRenderbufferSize = 8192;
 800    } else {
 801       if (MAX_WIDTH > 2048)
 802          ctx->Const.MaxRenderbufferSize = 2048;
 803    }
 804
 805    /* Initialize the software rasterizer and helper modules. */
 806    _swrast_CreateContext(ctx);
 807    _vbo_CreateContext(ctx);
 808    _tnl_CreateContext(ctx);
 809    _swsetup_CreateContext(ctx);
 810
 811    /* Configure swrast to match hardware characteristics: */
 812    _swrast_allow_pixel_fog(ctx, GL_FALSE);
 813    _swrast_allow_vertex_fog(ctx, GL_TRUE);
 814
 815    _mesa_meta_init(ctx);
 816
 817    intel->hw_stencil = mesaVis->stencilBits && mesaVis->depthBits == 24;
 818    intel->hw_stipple = 1;
 819
 820    /* XXX FBO: this doesn't seem to be used anywhere */
 821    switch (mesaVis->depthBits) {
 822    case 0:                     /* what to do in this case? */
 823    case 16:
 824       intel->polygon_offset_scale = 1.0;
 825       break;
 826    case 24:
 827       intel->polygon_offset_scale = 2.0;     /* req'd to pass glean */
 828       break;
 829    default:
 830       assert(0);
 831       break;
 832    }
 833
 834    if (intel->gen >= 4)
 835       intel->polygon_offset_scale /= 0xffff;
 836
 837    intel->RenderIndex = ~0;
 838
 839    switch (ctx->API) {
 840    case API_OPENGL:
 841       intelInitExtensions(ctx);
 842       break;
 843    case API_OPENGLES:
 844       intelInitExtensionsES1(ctx);
 845       break;
 846    case API_OPENGLES2:
 847       intelInitExtensionsES2(ctx);
 848       break;
 849    }
 850
 851    INTEL_DEBUG = driParseDebugString(getenv("INTEL_DEBUG"), debug_control);
 852    if (INTEL_DEBUG & DEBUG_BUFMGR)
 853       dri_bufmgr_set_debug(intel->bufmgr, GL_TRUE);
 854
 855    intel_batchbuffer_init(intel);
 856
 857    intel_fbo_init(intel);
 858
 859    if (intel->ctx.Mesa_DXTn) {
 860       _mesa_enable_extension(ctx, "GL_EXT_texture_compression_s3tc");
 861       _mesa_enable_extension(ctx, "GL_S3_s3tc");
 862    }
 863    else if (driQueryOptionb(&intel->optionCache, "force_s3tc_enable")) {
 864       _mesa_enable_extension(ctx, "GL_EXT_texture_compression_s3tc");
 865    }
 866    intel->use_texture_tiling = driQueryOptionb(&intel->optionCache,
 867                                                "texture_tiling");
 868    intel->use_early_z = driQueryOptionb(&intel->optionCache, "early_z");
 869
 870    intel->prim.primitive = ~0;
 871
 872    /* Force all software fallbacks */
 873    if (driQueryOptionb(&intel->optionCache, "no_rast")) {
 874       fprintf(stderr, "disabling 3D rasterization\n");
 875       intel->no_rast = 1;
 876    }
 877
 878    if (driQueryOptionb(&intel->optionCache, "always_flush_batch")) {
 879       fprintf(stderr, "flushing batchbuffer before/after each draw call\n");
 880       intel->always_flush_batch = 1;
 881    }
 882
 883    if (driQueryOptionb(&intel->optionCache, "always_flush_cache")) {
 884       fprintf(stderr, "flushing GPU caches before/after each draw call\n");
 885       intel->always_flush_cache = 1;
 886    }
 887
 888    return GL_TRUE;
 889 }
 890
 891 void
 892 intelDestroyContext(__DRIcontext * driContextPriv)
 893 {
 894    struct intel_context *intel =
 895       (struct intel_context *) driContextPriv->driverPrivate;
 896
 897    assert(intel);               /* should never be null */
 898    if (intel) {
 899       INTEL_FIREVERTICES(intel);
 900
 901       _mesa_meta_free(&intel->ctx);
 902
 903       intel->vtbl.destroy(intel);
 904
 905       _swsetup_DestroyContext(&intel->ctx);
 906       _tnl_DestroyContext(&intel->ctx);
 907       _vbo_DestroyContext(&intel->ctx);
 908
 909       _swrast_DestroyContext(&intel->ctx);
 910       intel->Fallback = 0x0;      /* don't call _swrast_Flush later */
 911
 912       intel_batchbuffer_free(intel);
 913
 914       free(intel->prim.vb);
 915       intel->prim.vb = NULL;
 916       drm_intel_bo_unreference(intel->prim.vb_bo);
 917       intel->prim.vb_bo = NULL;
 918       drm_intel_bo_unreference(intel->first_post_swapbuffers_batch);
 919       intel->first_post_swapbuffers_batch = NULL;
 920
 921       driDestroyOptionCache(&intel->optionCache);
 922
 923       /* free the Mesa context */
 924       _mesa_free_context_data(&intel->ctx);
 925
 926       FREE(intel);
 927       driContextPriv->driverPrivate = NULL;
 928    }
 929 }
 930
 931 GLboolean
 932 intelUnbindContext(__DRIcontext * driContextPriv)
 933 {
 934    /* Unset current context and dispath table */
 935    _mesa_make_current(NULL, NULL, NULL);
 936
 937    return GL_TRUE;
 938 }
 939
 940 GLboolean
 941 intelMakeCurrent(__DRIcontext * driContextPriv,
 942                  __DRIdrawable * driDrawPriv,
 943                  __DRIdrawable * driReadPriv)
 944 {
 945    struct intel_context *intel;
 946    GET_CURRENT_CONTEXT(curCtx);
 947
 948    if (driContextPriv)
 949       intel = (struct intel_context *) driContextPriv->driverPrivate;
 950    else
 951       intel = NULL;
 952
 953    /* According to the glXMakeCurrent() man page: "Pending commands to
 954     * the previous context, if any, are flushed before it is released."
 955     * But only flush if we're actually changing contexts.
 956     */
 957    if (intel_context(curCtx) && intel_context(curCtx) != intel) {
 958       _mesa_flush(curCtx);
 959    }
 960
 961    if (driContextPriv) {
 962       struct gl_framebuffer *fb, *readFb;
 963
 964       if (driDrawPriv == NULL && driReadPriv == NULL) {
 965          fb = _mesa_get_incomplete_framebuffer();
 966          readFb = _mesa_get_incomplete_framebuffer();
 967       } else {
 968          fb = driDrawPriv->driverPrivate;
 969          readFb = driReadPriv->driverPrivate;
 970          driContextPriv->dri2.draw_stamp = driDrawPriv->dri2.stamp - 1;
 971          driContextPriv->dri2.read_stamp = driReadPriv->dri2.stamp - 1;
 972       }
 973
 974       intel_prepare_render(intel);
 975       _mesa_make_current(&intel->ctx, fb, readFb);
 976
 977       /* We do this in intel_prepare_render() too, but intel->ctx.DrawBuffer
 978        * is NULL at that point.  We can't call _mesa_makecurrent()
 979        * first, since we need the buffer size for the initial
 980        * viewport.  So just call intel_draw_buffer() again here. */
 981       intel_draw_buffer(&intel->ctx, intel->ctx.DrawBuffer);
 982    }
 983    else {
 984       _mesa_make_current(NULL, NULL, NULL);
 985    }
 986
 987    return GL_TRUE;
 988 }
 989
 990 /**
 991  * \brief Query DRI2 to obtain a DRIdrawable's buffers.
 992  *
 993  * To determine which DRI buffers to request, examine the renderbuffers
 994  * attached to the drawable's framebuffer. Then request the buffers with
 995  * DRI2GetBuffers() or DRI2GetBuffersWithFormat().
 996  *
 997  * This is called from intel_update_renderbuffers(). It is used only if either
 998  * the hardware or the X driver lacks separate stencil support.
 999  *
1000  * \param drawable      Drawable whose buffers are queried.
1001  * \param buffers       [out] List of buffers returned by DRI2 query.
1002  * \param buffer_count  [out] Number of buffers returned.
1003  *
1004  * \see intel_update_renderbuffers()
1005  * \see DRI2GetBuffers()
1006  * \see DRI2GetBuffersWithFormat()
1007  */
1008 static void
1009 intel_query_dri2_buffers_no_separate_stencil(struct intel_context *intel,
1010                                              __DRIdrawable *drawable,
1011                                              __DRIbuffer **buffers,
1012                                              int *buffer_count)
1013 {
1014    assert(!intel->must_use_separate_stencil);
1015
1016    __DRIscreen *screen = intel->intelScreen->driScrnPriv;
1017    struct gl_framebuffer *fb = drawable->driverPrivate;
1018
1019    if (screen->dri2.loader
1020        && screen->dri2.loader->base.version > 2
1021        && screen->dri2.loader->getBuffersWithFormat != NULL) {
1022
1023       int i = 0;
1024       const int max_attachments = 4;
1025       unsigned *attachments = calloc(2 * max_attachments, sizeof(unsigned));
1026
1027       struct intel_renderbuffer *front_rb;
1028       struct intel_renderbuffer *back_rb;
1029       struct intel_renderbuffer *depth_rb;
1030       struct intel_renderbuffer *stencil_rb;
1031
1032       front_rb = intel_get_renderbuffer(fb, BUFFER_FRONT_LEFT);
1033       back_rb = intel_get_renderbuffer(fb, BUFFER_BACK_LEFT);
1034       depth_rb = intel_get_renderbuffer(fb, BUFFER_DEPTH);
1035       stencil_rb = intel_get_renderbuffer(fb, BUFFER_STENCIL);
1036
1037       if ((intel->is_front_buffer_rendering ||
1038            intel->is_front_buffer_reading ||
1039            !back_rb) && front_rb) {
1040          attachments[i++] = __DRI_BUFFER_FRONT_LEFT;
1041          attachments[i++] = intel_bits_per_pixel(front_rb);
1042       }
1043
1044       if (back_rb) {
1045          attachments[i++] = __DRI_BUFFER_BACK_LEFT;
1046          attachments[i++] = intel_bits_per_pixel(back_rb);
1047       }
1048
1049       if (depth_rb && stencil_rb) {
1050          attachments[i++] = __DRI_BUFFER_DEPTH_STENCIL;
1051          attachments[i++] = intel_bits_per_pixel(depth_rb);
1052       } else if (depth_rb) {
1053          attachments[i++] = __DRI_BUFFER_DEPTH;
1054          attachments[i++] = intel_bits_per_pixel(depth_rb);
1055       } else if (stencil_rb) {
1056          attachments[i++] = __DRI_BUFFER_STENCIL;
1057          attachments[i++] = intel_bits_per_pixel(stencil_rb);
1058       }
1059
1060       assert(i <= 2 * max_attachments);
1061
1062       *buffers = screen->dri2.loader->getBuffersWithFormat(drawable,
1063                                                            &drawable->w,
1064                                                            &drawable->h,
1065                                                            attachments, i / 2,
1066                                                            buffer_count,
1067                                                            drawable->loaderPrivate);
1068       free(attachments);
1069
1070    } else if (screen->dri2.loader) {
1071
1072       int i = 0;
1073       const int max_attachments = 4;
1074       unsigned *attachments = calloc(max_attachments, sizeof(unsigned));
1075
1076       if (intel_get_renderbuffer(fb, BUFFER_FRONT_LEFT))
1077          attachments[i++] = __DRI_BUFFER_FRONT_LEFT;
1078       if (intel_get_renderbuffer(fb, BUFFER_BACK_LEFT))
1079          attachments[i++] = __DRI_BUFFER_BACK_LEFT;
1080       if (intel_get_renderbuffer(fb, BUFFER_DEPTH))
1081          attachments[i++] = __DRI_BUFFER_DEPTH;
1082       if (intel_get_renderbuffer(fb, BUFFER_STENCIL))
1083          attachments[i++] = __DRI_BUFFER_STENCIL;
1084
1085       assert(i <= max_attachments);
1086
1087       *buffers = screen->dri2.loader->getBuffersWithFormat(drawable,
1088                                                            &drawable->w,
1089                                                            &drawable->h,
1090                                                            attachments, i,
1091                                                            buffer_count,
1092                                                            drawable->loaderPrivate);
1093       free(attachments);
1094
1095    } else {
1096       *buffers = NULL;
1097       *buffer_count = 0;
1098    }
1099 }
1100
1101 /**
1102  * \brief Assign a DRI buffer's DRM region to a renderbuffer.
1103  *
1104  * This is called from intel_update_renderbuffers().  It is used only if
1105  * either the hardware or the X driver lacks separate stencil support.
1106  *
1107  * \par Note:
1108  *    DRI buffers whose attachment point is DRI2BufferStencil or
1109  *    DRI2BufferDepthStencil are handled as special cases.
1110  *
1111  * \param buffer_name is a human readable name, such as "dri2 front buffer",
1112  *        that is passed to intel_region_alloc_for_handle().
1113  *
1114  * \see intel_update_renderbuffers()
1115  * \see intel_region_alloc_for_handle()
1116  * \see intel_renderbuffer_set_region()
1117  */
1118 static void
1119 intel_process_dri2_buffer_no_separate_stencil(struct intel_context *intel,
1120                                               __DRIdrawable *drawable,
1121                                               __DRIbuffer *buffer,
1122                                               struct intel_renderbuffer *rb,
1123                                               const char *buffer_name)
1124 {
1125    assert(!intel->must_use_separate_stencil);
1126
1127    struct gl_framebuffer *fb = drawable->driverPrivate;
1128    struct intel_region *region = NULL;
1129    struct intel_renderbuffer *depth_rb = NULL;
1130
1131    if (!rb)
1132       return;
1133
1134    if (rb->region && rb->region->name == buffer->name)
1135       return;
1136
1137    if (unlikely(INTEL_DEBUG & DEBUG_DRI)) {
1138       fprintf(stderr,
1139               "attaching buffer %d, at %d, cpp %d, pitch %d\n",
1140               buffer->name, buffer->attachment,
1141               buffer->cpp, buffer->pitch);
1142    }
1143
1144    bool identify_depth_and_stencil = false;
1145    if (buffer->attachment == __DRI_BUFFER_STENCIL) {
1146       struct intel_renderbuffer *depth_rb =
1147          intel_get_renderbuffer(fb, BUFFER_DEPTH);
1148       identify_depth_and_stencil = depth_rb && depth_rb->region;
1149    }
1150
1151    if (identify_depth_and_stencil) {
1152       if (unlikely(INTEL_DEBUG & DEBUG_DRI)) {
1153          fprintf(stderr, "(reusing depth buffer as stencil)\n");
1154       }
1155       intel_region_reference(&region, depth_rb->region);
1156    } else {
1157       region = intel_region_alloc_for_handle(intel->intelScreen,
1158                                              buffer->cpp,
1159                                              drawable->w,
1160                                              drawable->h,
1161                                              buffer->pitch / buffer->cpp,
1162                                              buffer->name,
1163                                              buffer_name);
1164    }
1165
1166    intel_renderbuffer_set_region(intel, rb, region);
1167    intel_region_release(&region);
1168
1169    if (buffer->attachment == __DRI_BUFFER_DEPTH_STENCIL) {
1170       struct intel_renderbuffer *stencil_rb =
1171          intel_get_renderbuffer(fb, BUFFER_STENCIL);
1172
1173       if (!stencil_rb)
1174          return;
1175
1176       if (stencil_rb->region && stencil_rb->region->name == buffer->name)
1177          return;
1178
1179       intel_renderbuffer_set_region(intel, stencil_rb, region);
1180    }
1181 }
1182
1183 /**
1184  * \brief Query DRI2 to obtain a DRIdrawable's buffers.
1185  *
1186  * To determine which DRI buffers to request, examine the renderbuffers
1187  * attached to the drawable's framebuffer. Then request the buffers with
1188  * DRI2GetBuffersWithFormat().
1189  *
1190  * This is called from intel_update_renderbuffers(). It is used when 1) the
1191  * hardware supports separate stencil and 2) the X driver's separate stencil
1192  * support has been verified to work or is still unknown.
1193  *
1194  * \param drawable      Drawable whose buffers are queried.
1195  * \param buffers       [out] List of buffers returned by DRI2 query.
1196  * \param buffer_count  [out] Number of buffers returned.
1197  * \param attachments   [out] List of pairs (attachment_point, bits_per_pixel)
1198  *                      that were submitted in the DRI2 query. Number of pairs
1199  *                      is same as buffer_count.
1200  *
1201  * \see intel_update_renderbuffers()
1202  * \see DRI2GetBuffersWithFormat()
1203  * \see enum intel_dri2_has_hiz
1204  */
1205 static void
1206 intel_query_dri2_buffers_with_separate_stencil(struct intel_context *intel,
1207                                                __DRIdrawable *drawable,
1208                                                __DRIbuffer **buffers,
1209                                                unsigned **attachments,
1210                                                int *count)
1211 {
1212    assert(intel->has_separate_stencil);
1213
1214    __DRIscreen *screen = intel->intelScreen->driScrnPriv;
1215    struct gl_framebuffer *fb = drawable->driverPrivate;
1216
1217    const int max_attachments = 5;
1218    int i = 0;
1219
1220    *attachments = calloc(2 * max_attachments, sizeof(unsigned));
1221    if (!*attachments) {
1222       *buffers = NULL;
1223       *count = 0;
1224       return;
1225    }
1226
1227    struct intel_renderbuffer *front_rb;
1228    struct intel_renderbuffer *back_rb;
1229    struct intel_renderbuffer *depth_rb;
1230    struct intel_renderbuffer *stencil_rb;
1231
1232    front_rb = intel_get_renderbuffer(fb, BUFFER_FRONT_LEFT);
1233    back_rb = intel_get_renderbuffer(fb, BUFFER_BACK_LEFT);
1234    depth_rb = intel_get_renderbuffer(fb, BUFFER_DEPTH);
1235    stencil_rb = intel_get_renderbuffer(fb, BUFFER_STENCIL);
1236
1237    if ((intel->is_front_buffer_rendering ||
1238         intel->is_front_buffer_reading ||
1239         !back_rb) && front_rb) {
1240       (*attachments)[i++] = __DRI_BUFFER_FRONT_LEFT;
1241       (*attachments)[i++] = intel_bits_per_pixel(front_rb);
1242    }
1243
1244    if (back_rb) {
1245       (*attachments)[i++] = __DRI_BUFFER_BACK_LEFT;
1246       (*attachments)[i++] = intel_bits_per_pixel(back_rb);
1247    }
1248
1249    /*
1250     * We request a separate stencil buffer, and perhaps a hiz buffer too, even
1251     * if we do not yet know if the X driver supports it. See the comments for
1252     * 'enum intel_dri2_has_hiz'.
1253     */
1254
1255    if (depth_rb) {
1256       (*attachments)[i++] = __DRI_BUFFER_DEPTH;
1257       (*attachments)[i++] = intel_bits_per_pixel(depth_rb);
1258
1259       if (intel->vtbl.is_hiz_depth_format(intel, depth_rb->Base.Format)) {
1260          /* Depth and hiz buffer have same bpp. */
1261          (*attachments)[i++] = __DRI_BUFFER_HIZ;
1262          (*attachments)[i++] = intel_bits_per_pixel(depth_rb);
1263       }
1264    }
1265
1266    if (stencil_rb) {
1267       assert(stencil_rb->Base.Format == MESA_FORMAT_S8);
1268       (*attachments)[i++] = __DRI_BUFFER_STENCIL;
1269       (*attachments)[i++] = intel_bits_per_pixel(stencil_rb);
1270    }
1271
1272    assert(i <= 2 * max_attachments);
1273
1274    *buffers = screen->dri2.loader->getBuffersWithFormat(drawable,
1275                                                         &drawable->w,
1276                                                         &drawable->h,
1277                                                         *attachments, i / 2,
1278                                                         count,
1279                                                         drawable->loaderPrivate);
1280
1281    if (!*buffers) {
1282       free(*attachments);
1283       *attachments = NULL;
1284       *count = 0;
1285    }
1286 }
1287
1288 /**
1289  * \brief Assign a DRI buffer's DRM region to a renderbuffer.
1290  *
1291  * This is called from intel_update_renderbuffers().  It is used when 1) the
1292  * hardware supports separate stencil and 2) the X driver's separate stencil
1293  * support has been verified to work or is still unknown.
1294  *
1295  * \par Note:
1296  *    DRI buffers whose attachment point is DRI2BufferStencil or DRI2BufferHiz
1297  *    are handled as special cases.
1298  *
1299  * \param buffer_name is a human readable name, such as "dri2 front buffer",
1300  *        that is passed to intel_region_alloc_for_handle().
1301  *
1302  * \see intel_update_renderbuffers()
1303  * \see intel_region_alloc_for_handle()
1304  * \see intel_renderbuffer_set_region()
1305  * \see enum intel_dri2_has_hiz
1306  */
1307 static void
1308 intel_process_dri2_buffer_with_separate_stencil(struct intel_context *intel,
1309                                                 __DRIdrawable *drawable,
1310                                                 __DRIbuffer *buffer,
1311                                                 struct intel_renderbuffer *rb,
1312                                                 const char *buffer_name)
1313 {
1314    assert(intel->has_separate_stencil);
1315    assert(buffer->attachment != __DRI_BUFFER_DEPTH_STENCIL);
1316
1317    if (!rb)
1318       return;
1319
1320    /* If the renderbuffer's and DRIbuffer's regions match, then continue. */
1321    if ((buffer->attachment != __DRI_BUFFER_HIZ &&
1322         rb->region &&
1323         rb->region->name == buffer->name) ||
1324        (buffer->attachment == __DRI_BUFFER_HIZ &&
1325         rb->hiz_region &&
1326         rb->hiz_region->name == buffer->name)) {
1327       return;
1328    }
1329
1330    if (unlikely(INTEL_DEBUG & DEBUG_DRI)) {
1331       fprintf(stderr,
1332               "attaching buffer %d, at %d, cpp %d, pitch %d\n",
1333               buffer->name, buffer->attachment,
1334               buffer->cpp, buffer->pitch);
1335    }
1336
1337    int buffer_width;
1338    int buffer_height;
1339    if (buffer->attachment == __DRI_BUFFER_STENCIL) {
1340       /* The stencil buffer has quirky pitch requirements.  From Section
1341        * 2.11.5.6.2.1 3DSTATE_STENCIL_BUFFER, field "Surface Pitch":
1342        *    The pitch must be set to 2x the value computed based on width, as
1343        *    the stencil buffer is stored with two rows interleaved.
1344        *
1345        * To satisfy the pitch requirement, the X driver allocated the region
1346        * with the following dimensions.
1347        */
1348        buffer_width = ALIGN(drawable->w, 64);
1349        buffer_height = ALIGN(ALIGN(drawable->h, 2) / 2, 64);
1350    } else {
1351        buffer_width = drawable->w;
1352        buffer_height = drawable->h;
1353    }
1354
1355    struct intel_region *region =
1356       intel_region_alloc_for_handle(intel->intelScreen,
1357                                     buffer->cpp,
1358                                     buffer_width,
1359                                     buffer_height,
1360                                     buffer->pitch / buffer->cpp,
1361                                     buffer->name,
1362                                     buffer_name);
1363
1364    if (buffer->attachment == __DRI_BUFFER_HIZ) {
1365       intel_renderbuffer_set_hiz_region(intel, rb, region);
1366    } else {
1367       intel_renderbuffer_set_region(intel, rb, region);
1368    }
1369
1370    intel_region_release(&region);
1371 }
1372
1373 /**
1374  * \brief Verify that the X driver supports hiz and separate stencil.
1375  *
1376  * This implements the cleanup stage of the handshake described in the
1377  * comments for 'enum intel_dri2_has_hiz'.
1378  *
1379  * This should be called from intel_update_renderbuffers() after 1) the
1380  * DRIdrawable has been queried for its buffers via DRI2GetBuffersWithFormat()
1381  * and 2) the DRM region of each returned DRIbuffer has been assigned to the
1382  * appropriate intel_renderbuffer. Furthermore, this should be called *only*
1383  * when 1) intel_update_renderbuffers() tried to used the X driver's separate
1384  * stencil functionality and 2) it has not yet been determined if the X driver
1385  * supports separate stencil.
1386  *
1387  * If we determine that the X driver does have support, then we set
1388  * intel_screen.dri2_has_hiz to true and return.
1389  *
1390  * If we determine that the X driver lacks support, and we requested
1391  * a DRI2BufferDepth and DRI2BufferStencil, then we must remedy the mistake by
1392  * taking the following actions:
1393  *    1. Discard the framebuffer's stencil and depth renderbuffers.
1394  *    2. Create a combined depth/stencil renderbuffer and attach
1395  *       it to the framebuffer's depth and stencil attachment points.
1396  *    3. Query the drawable for a new set of buffers, which consists of the
1397  *       originally requested set plus DRI2BufferDepthStencil.
1398  *    4. Assign the DRI2BufferDepthStencil's DRM region to the new
1399  *       depth/stencil renderbuffer.
1400  *
1401  * \pre intel->intelScreen->dri2_has_hiz == INTEL_DRI2_HAS_HIZ_UNKNOWN
1402  *
1403  * \param drawable      Drawable whose buffers were queried.
1404  *
1405  * \param buffers       [in/out] As input, the buffer list returned by the
1406  *                      original DRI2 query. As output, the current buffer
1407  *                      list, which may have been altered by a new DRI2 query.
1408  *
1409  * \param attachments   [in/out] As input, the attachment list submitted
1410  *                      in the original DRI2 query. As output, the attachment
1411  *                      list that was submitted in the DRI2 query that
1412  *                      obtained the current buffer list, as returned in the
1413  *                      output parameter \c buffers.  (Note: If no new query
1414  *                      was made, then the list remains unaltered).
1415  *
1416  * \param count         [out] Number of buffers in the current buffer list, as
1417  *                      returned in the output parameter \c buffers.
1418  *
1419  * \see enum intel_dri2_has_hiz
1420  * \see struct intel_screen::dri2_has_hiz
1421  * \see intel_update_renderbuffers
1422  */
1423 static void
1424 intel_verify_dri2_has_hiz(struct intel_context *intel,
1425                           __DRIdrawable *drawable,
1426                           __DRIbuffer **buffers,
1427                           unsigned **attachments,
1428                           int *count)
1429 {
1430    assert(intel->intelScreen->dri2_has_hiz == INTEL_DRI2_HAS_HIZ_UNKNOWN);
1431
1432    struct gl_framebuffer *fb = drawable->driverPrivate;
1433    struct intel_renderbuffer *stencil_rb =
1434       intel_get_renderbuffer(fb, BUFFER_STENCIL);
1435
1436    if (stencil_rb) {
1437       /*
1438        * We requested a DRI2BufferStencil without knowing if the X driver
1439        * supports it. Now, check if X handled the request correctly and clean
1440        * up if it did not. (See comments for 'enum intel_dri2_has_hiz').
1441        */
1442       struct intel_renderbuffer *depth_rb =
1443          intel_get_renderbuffer(fb, BUFFER_DEPTH);
1444       assert(stencil_rb->Base.Format == MESA_FORMAT_S8);
1445       assert(depth_rb && depth_rb->Base.Format == MESA_FORMAT_X8_Z24);
1446
1447       if (stencil_rb->region->tiling == I915_TILING_NONE) {
1448          /*
1449           * The stencil buffer is actually W tiled. The region's tiling is
1450           * I915_TILING_NONE, however, because the GTT is incapable of W
1451           * fencing.
1452           */
1453          intel->intelScreen->dri2_has_hiz = INTEL_DRI2_HAS_HIZ_TRUE;
1454          return;
1455       } else {
1456          /*
1457           * Oops... the screen doesn't support separate stencil. Discard the
1458           * separate depth and stencil buffers and replace them with
1459           * a combined depth/stencil buffer. Discard the hiz buffer too.
1460           */
1461          intel->intelScreen->dri2_has_hiz = INTEL_DRI2_HAS_HIZ_FALSE;
1462
1463          /* 1. Discard depth and stencil renderbuffers. */
1464          _mesa_remove_renderbuffer(fb, BUFFER_DEPTH);
1465          depth_rb = NULL;
1466          _mesa_remove_renderbuffer(fb, BUFFER_STENCIL);
1467          stencil_rb = NULL;
1468
1469          /* 2. Create new depth/stencil renderbuffer. */
1470          struct intel_renderbuffer *depth_stencil_rb =
1471             intel_create_renderbuffer(MESA_FORMAT_S8_Z24);
1472          _mesa_add_renderbuffer(fb, BUFFER_DEPTH, &depth_stencil_rb->Base);
1473          _mesa_add_renderbuffer(fb, BUFFER_STENCIL, &depth_stencil_rb->Base);
1474
1475          /* 3. Append DRI2BufferDepthStencil to attachment list. */
1476          int old_count = *count;
1477          unsigned int *old_attachments = *attachments;
1478          *count = old_count + 1;
1479          *attachments = malloc(2 * (*count) * sizeof(unsigned));
1480          memcpy(*attachments, old_attachments, 2 * old_count * sizeof(unsigned));
1481          free(old_attachments);
1482          (*attachments)[2 * old_count + 0] = __DRI_BUFFER_DEPTH_STENCIL;
1483          (*attachments)[2 * old_count + 1] = intel_bits_per_pixel(depth_stencil_rb);
1484
1485          /* 4. Request new set of DRI2 attachments. */
1486          __DRIscreen *screen = intel->intelScreen->driScrnPriv;
1487          *buffers = screen->dri2.loader->getBuffersWithFormat(drawable,
1488                                                               &drawable->w,
1489                                                               &drawable->h,
1490                                                               *attachments,
1491                                                               *count,
1492                                                               count,
1493                                                               drawable->loaderPrivate);
1494          if (!*buffers)
1495             return;
1496
1497          /*
1498           * I don't know how to recover from the failure assertion below.
1499           * Rather than fail gradually and unexpectedly, we should just die
1500           * now.
1501           */
1502          assert(*count == old_count + 1);
1503
1504          /* 5. Assign the DRI buffer's DRM region to the its renderbuffers. */
1505          __DRIbuffer *depth_stencil_buffer = NULL;
1506          for (int i = 0; i < *count; ++i) {
1507             if ((*buffers)[i].attachment == __DRI_BUFFER_DEPTH_STENCIL) {
1508                depth_stencil_buffer = &(*buffers)[i];
1509                break;
1510             }
1511          }
1512          struct intel_region *region =
1513             intel_region_alloc_for_handle(intel->intelScreen,
1514                                           depth_stencil_buffer->cpp,
1515                                           drawable->w,
1516                                           drawable->h,
1517                                           depth_stencil_buffer->pitch
1518                                              / depth_stencil_buffer->cpp,
1519                                           depth_stencil_buffer->name,
1520                                           "dri2 depth / stencil buffer");
1521          intel_renderbuffer_set_region(intel,
1522                                        intel_get_renderbuffer(fb, BUFFER_DEPTH),
1523                                        region);
1524          intel_renderbuffer_set_region(intel,
1525                                        intel_get_renderbuffer(fb, BUFFER_STENCIL),
1526                                        region);
1527          intel_region_release(&region);
1528       }
1529    }
1530
1531    if (intel_framebuffer_has_hiz(fb)) {
1532       /*
1533        * In the future, the driver may advertise a GL config with hiz
1534        * compatible depth bits and 0 stencil bits (for example, when the
1535        * driver gains support for float32 depth buffers). When that day comes,
1536        * here we need to verify that the X driver does in fact support hiz and
1537        * clean up if it doesn't.
1538        *
1539        * Presently, however, no verification or clean up is necessary, and
1540        * execution should not reach here. If the framebuffer still has a hiz
1541        * region, then we have already set dri2_has_hiz to true after
1542        * confirming above that the stencil buffer is W tiled.
1543        */
1544       assert(0);
1545    }
1546 }