src/mesa/drivers/dri/i965/intel_fbo.c

   1 /**************************************************************************
   2  *
   3  * Copyright 2006 VMware, Inc.
   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 VMWARE 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/enums.h"
  30 #include "main/imports.h"
  31 #include "main/macros.h"
  32 #include "main/mtypes.h"
  33 #include "main/fbobject.h"
  34 #include "main/framebuffer.h"
  35 #include "main/renderbuffer.h"
  36 #include "main/context.h"
  37 #include "main/teximage.h"
  38 #include "main/image.h"
  39
  40 #include "swrast/swrast.h"
  41 #include "drivers/common/meta.h"
  42
  43 #include "intel_batchbuffer.h"
  44 #include "intel_buffers.h"
  45 #include "intel_blit.h"
  46 #include "intel_fbo.h"
  47 #include "intel_mipmap_tree.h"
  48 #include "intel_regions.h"
  49 #include "intel_screen.h"
  50 #include "intel_tex.h"
  51 #include "brw_context.h"
  52
  53 #define FILE_DEBUG_FLAG DEBUG_FBO
  54
  55 /**
  56  * Create a new framebuffer object.
  57  */
  58 static struct gl_framebuffer *
  59 intel_new_framebuffer(struct gl_context * ctx, GLuint name)
  60 {
  61    /* Only drawable state in intel_framebuffer at this time, just use Mesa's
  62     * class
  63     */
  64    return _mesa_new_framebuffer(ctx, name);
  65 }
  66
  67
  68 /** Called by gl_renderbuffer::Delete() */
  69 static void
  70 intel_delete_renderbuffer(struct gl_context *ctx, struct gl_renderbuffer *rb)
  71 {
  72    struct intel_renderbuffer *irb = intel_renderbuffer(rb);
  73
  74    ASSERT(irb);
  75
  76    intel_miptree_release(&irb->mt);
  77
  78    _mesa_delete_renderbuffer(ctx, rb);
  79 }
  80
  81 /**
  82  * \see dd_function_table::MapRenderbuffer
  83  */
  84 static void
  85 intel_map_renderbuffer(struct gl_context *ctx,
  86                        struct gl_renderbuffer *rb,
  87                        GLuint x, GLuint y, GLuint w, GLuint h,
  88                        GLbitfield mode,
  89                        GLubyte **out_map,
  90                        GLint *out_stride)
  91 {
  92    struct brw_context *brw = brw_context(ctx);
  93    struct swrast_renderbuffer *srb = (struct swrast_renderbuffer *)rb;
  94    struct intel_renderbuffer *irb = intel_renderbuffer(rb);
  95    void *map;
  96    int stride;
  97
  98    if (srb->Buffer) {
  99       /* this is a malloc'd renderbuffer (accum buffer), not an irb */
 100       GLint bpp = _mesa_get_format_bytes(rb->Format);
 101       GLint rowStride = srb->RowStride;
 102       *out_map = (GLubyte *) srb->Buffer + y * rowStride + x * bpp;
 103       *out_stride = rowStride;
 104       return;
 105    }
 106
 107    intel_prepare_render(brw);
 108
 109    /* For a window-system renderbuffer, we need to flip the mapping we receive
 110     * upside-down.  So we need to ask for a rectangle on flipped vertically, and
 111     * we then return a pointer to the bottom of it with a negative stride.
 112     */
 113    if (rb->Name == 0) {
 114       y = rb->Height - y - h;
 115    }
 116
 117    intel_miptree_map(brw, irb->mt, irb->mt_level, irb->mt_layer,
 118                      x, y, w, h, mode, &map, &stride);
 119
 120    if (rb->Name == 0) {
 121       map += (h - 1) * stride;
 122       stride = -stride;
 123    }
 124
 125    DBG("%s: rb %d (%s) mt mapped: (%d, %d) (%dx%d) -> %p/%d\n",
 126        __FUNCTION__, rb->Name, _mesa_get_format_name(rb->Format),
 127        x, y, w, h, map, stride);
 128
 129    *out_map = map;
 130    *out_stride = stride;
 131 }
 132
 133 /**
 134  * \see dd_function_table::UnmapRenderbuffer
 135  */
 136 static void
 137 intel_unmap_renderbuffer(struct gl_context *ctx,
 138                          struct gl_renderbuffer *rb)
 139 {
 140    struct brw_context *brw = brw_context(ctx);
 141    struct swrast_renderbuffer *srb = (struct swrast_renderbuffer *)rb;
 142    struct intel_renderbuffer *irb = intel_renderbuffer(rb);
 143
 144    DBG("%s: rb %d (%s)\n", __FUNCTION__,
 145        rb->Name, _mesa_get_format_name(rb->Format));
 146
 147    if (srb->Buffer) {
 148       /* this is a malloc'd renderbuffer (accum buffer) */
 149       /* nothing to do */
 150       return;
 151    }
 152
 153    intel_miptree_unmap(brw, irb->mt, irb->mt_level, irb->mt_layer);
 154 }
 155
 156
 157 /**
 158  * Round up the requested multisample count to the next supported sample size.
 159  */
 160 unsigned
 161 intel_quantize_num_samples(struct intel_screen *intel, unsigned num_samples)
 162 {
 163    const int *msaa_modes = intel_supported_msaa_modes(intel);
 164    int quantized_samples = 0;
 165
 166    for (int i = 0; msaa_modes[i] != -1; ++i) {
 167       if (msaa_modes[i] >= num_samples)
 168          quantized_samples = msaa_modes[i];
 169       else
 170          break;
 171    }
 172
 173    return quantized_samples;
 174 }
 175
 176
 177 /**
 178  * Called via glRenderbufferStorageEXT() to set the format and allocate
 179  * storage for a user-created renderbuffer.
 180  */
 181 static GLboolean
 182 intel_alloc_renderbuffer_storage(struct gl_context * ctx, struct gl_renderbuffer *rb,
 183                                  GLenum internalFormat,
 184                                  GLuint width, GLuint height)
 185 {
 186    struct brw_context *brw = brw_context(ctx);
 187    struct intel_screen *screen = brw->intelScreen;
 188    struct intel_renderbuffer *irb = intel_renderbuffer(rb);
 189    rb->NumSamples = intel_quantize_num_samples(screen, rb->NumSamples);
 190
 191    switch (internalFormat) {
 192    default:
 193       /* Use the same format-choice logic as for textures.
 194        * Renderbuffers aren't any different from textures for us,
 195        * except they're less useful because you can't texture with
 196        * them.
 197        */
 198       rb->Format = ctx->Driver.ChooseTextureFormat(ctx, GL_TEXTURE_2D,
 199                                                    internalFormat,
 200                                                    GL_NONE, GL_NONE);
 201       break;
 202    case GL_STENCIL_INDEX:
 203    case GL_STENCIL_INDEX1_EXT:
 204    case GL_STENCIL_INDEX4_EXT:
 205    case GL_STENCIL_INDEX8_EXT:
 206    case GL_STENCIL_INDEX16_EXT:
 207       /* These aren't actual texture formats, so force them here. */
 208       if (brw->has_separate_stencil) {
 209          rb->Format = MESA_FORMAT_S_UINT8;
 210       } else {
 211          assert(!brw->must_use_separate_stencil);
 212          rb->Format = MESA_FORMAT_Z24_UNORM_X8_UINT;
 213       }
 214       break;
 215    }
 216
 217    rb->Width = width;
 218    rb->Height = height;
 219    rb->_BaseFormat = _mesa_base_fbo_format(ctx, internalFormat);
 220
 221    intel_miptree_release(&irb->mt);
 222
 223    DBG("%s: %s: %s (%dx%d)\n", __FUNCTION__,
 224        _mesa_lookup_enum_by_nr(internalFormat),
 225        _mesa_get_format_name(rb->Format), width, height);
 226
 227    if (width == 0 || height == 0)
 228       return true;
 229
 230    irb->mt = intel_miptree_create_for_renderbuffer(brw, rb->Format,
 231                                                    width, height,
 232                                                    rb->NumSamples);
 233    if (!irb->mt)
 234       return false;
 235
 236    return true;
 237 }
 238
 239
 240 static void
 241 intel_image_target_renderbuffer_storage(struct gl_context *ctx,
 242                                         struct gl_renderbuffer *rb,
 243                                         void *image_handle)
 244 {
 245    struct brw_context *brw = brw_context(ctx);
 246    struct intel_renderbuffer *irb;
 247    __DRIscreen *screen;
 248    __DRIimage *image;
 249
 250    screen = brw->intelScreen->driScrnPriv;
 251    image = screen->dri2.image->lookupEGLImage(screen, image_handle,
 252                                               screen->loaderPrivate);
 253    if (image == NULL)
 254       return;
 255
 256    if (image->planar_format && image->planar_format->nplanes > 1) {
 257       _mesa_error(ctx, GL_INVALID_OPERATION,
 258             "glEGLImageTargetRenderbufferStorage(planar buffers are not "
 259                "supported as render targets.");
 260       return;
 261    }
 262
 263    /* Buffers originating from outside are for read-only. */
 264    if (image->dma_buf_imported) {
 265       _mesa_error(ctx, GL_INVALID_OPERATION,
 266             "glEGLImageTargetRenderbufferStorage(dma buffers are read-only)");
 267       return;
 268    }
 269
 270    /* __DRIimage is opaque to the core so it has to be checked here */
 271    switch (image->format) {
 272    case MESA_FORMAT_R8G8B8A8_UNORM:
 273       _mesa_error(ctx, GL_INVALID_OPERATION,
 274             "glEGLImageTargetRenderbufferStorage(unsupported image format");
 275       return;
 276       break;
 277    default:
 278       break;
 279    }
 280
 281    irb = intel_renderbuffer(rb);
 282    intel_miptree_release(&irb->mt);
 283    irb->mt = intel_miptree_create_for_bo(brw,
 284                                          image->region->bo,
 285                                          image->format,
 286                                          image->offset,
 287                                          image->region->width,
 288                                          image->region->height,
 289                                          image->region->pitch,
 290                                          image->region->tiling);
 291    if (!irb->mt)
 292       return;
 293
 294    rb->InternalFormat = image->internal_format;
 295    rb->Width = image->region->width;
 296    rb->Height = image->region->height;
 297    rb->Format = image->format;
 298    rb->_BaseFormat = _mesa_base_fbo_format(ctx, image->internal_format);
 299    rb->NeedsFinishRenderTexture = true;
 300 }
 301
 302 /**
 303  * Called by _mesa_resize_framebuffer() for each hardware renderbuffer when a
 304  * window system framebuffer is resized.
 305  *
 306  * Any actual buffer reallocations for hardware renderbuffers (which would
 307  * have triggered _mesa_resize_framebuffer()) were done by
 308  * intel_process_dri2_buffer().
 309  */
 310 static GLboolean
 311 intel_alloc_window_storage(struct gl_context * ctx, struct gl_renderbuffer *rb,
 312                            GLenum internalFormat, GLuint width, GLuint height)
 313 {
 314    ASSERT(rb->Name == 0);
 315    rb->Width = width;
 316    rb->Height = height;
 317    rb->InternalFormat = internalFormat;
 318
 319    return true;
 320 }
 321
 322 /** Dummy function for gl_renderbuffer::AllocStorage() */
 323 static GLboolean
 324 intel_nop_alloc_storage(struct gl_context * ctx, struct gl_renderbuffer *rb,
 325                         GLenum internalFormat, GLuint width, GLuint height)
 326 {
 327    _mesa_problem(ctx, "intel_op_alloc_storage should never be called.");
 328    return false;
 329 }
 330
 331 /**
 332  * Create a new intel_renderbuffer which corresponds to an on-screen window,
 333  * not a user-created renderbuffer.
 334  *
 335  * \param num_samples must be quantized.
 336  */
 337 struct intel_renderbuffer *
 338 intel_create_renderbuffer(mesa_format format, unsigned num_samples)
 339 {
 340    struct intel_renderbuffer *irb;
 341    struct gl_renderbuffer *rb;
 342
 343    GET_CURRENT_CONTEXT(ctx);
 344
 345    irb = CALLOC_STRUCT(intel_renderbuffer);
 346    if (!irb) {
 347       _mesa_error(ctx, GL_OUT_OF_MEMORY, "creating renderbuffer");
 348       return NULL;
 349    }
 350
 351    rb = &irb->Base.Base;
 352
 353    _mesa_init_renderbuffer(rb, 0);
 354    rb->ClassID = INTEL_RB_CLASS;
 355    rb->_BaseFormat = _mesa_get_format_base_format(format);
 356    rb->Format = format;
 357    rb->InternalFormat = rb->_BaseFormat;
 358    rb->NumSamples = num_samples;
 359
 360    /* intel-specific methods */
 361    rb->Delete = intel_delete_renderbuffer;
 362    rb->AllocStorage = intel_alloc_window_storage;
 363
 364    return irb;
 365 }
 366
 367 /**
 368  * Private window-system buffers (as opposed to ones shared with the display
 369  * server created with intel_create_renderbuffer()) are most similar in their
 370  * handling to user-created renderbuffers, but they have a resize handler that
 371  * may be called at intel_update_renderbuffers() time.
 372  *
 373  * \param num_samples must be quantized.
 374  */
 375 struct intel_renderbuffer *
 376 intel_create_private_renderbuffer(mesa_format format, unsigned num_samples)
 377 {
 378    struct intel_renderbuffer *irb;
 379
 380    irb = intel_create_renderbuffer(format, num_samples);
 381    irb->Base.Base.AllocStorage = intel_alloc_renderbuffer_storage;
 382
 383    return irb;
 384 }
 385
 386 /**
 387  * Create a new renderbuffer object.
 388  * Typically called via glBindRenderbufferEXT().
 389  */
 390 static struct gl_renderbuffer *
 391 intel_new_renderbuffer(struct gl_context * ctx, GLuint name)
 392 {
 393    struct intel_renderbuffer *irb;
 394    struct gl_renderbuffer *rb;
 395
 396    irb = CALLOC_STRUCT(intel_renderbuffer);
 397    if (!irb) {
 398       _mesa_error(ctx, GL_OUT_OF_MEMORY, "creating renderbuffer");
 399       return NULL;
 400    }
 401
 402    rb = &irb->Base.Base;
 403
 404    _mesa_init_renderbuffer(rb, name);
 405    rb->ClassID = INTEL_RB_CLASS;
 406
 407    /* intel-specific methods */
 408    rb->Delete = intel_delete_renderbuffer;
 409    rb->AllocStorage = intel_alloc_renderbuffer_storage;
 410    /* span routines set in alloc_storage function */
 411
 412    return rb;
 413 }
 414
 415 static bool
 416 intel_renderbuffer_update_wrapper(struct brw_context *brw,
 417                                   struct intel_renderbuffer *irb,
 418                                   struct gl_texture_image *image,
 419                                   uint32_t layer)
 420 {
 421    struct gl_renderbuffer *rb = &irb->Base.Base;
 422    struct intel_texture_image *intel_image = intel_texture_image(image);
 423    struct intel_mipmap_tree *mt = intel_image->mt;
 424    int level = image->Level;
 425
 426    rb->AllocStorage = intel_nop_alloc_storage;
 427
 428    intel_miptree_check_level_layer(mt, level, layer);
 429    irb->mt_level = level;
 430
 431    switch (mt->msaa_layout) {
 432       case INTEL_MSAA_LAYOUT_UMS:
 433       case INTEL_MSAA_LAYOUT_CMS:
 434          irb->mt_layer = layer * mt->num_samples;
 435          break;
 436
 437       default:
 438          irb->mt_layer = layer;
 439    }
 440
 441    intel_miptree_reference(&irb->mt, mt);
 442
 443    intel_renderbuffer_set_draw_offset(irb);
 444
 445    if (mt->hiz_mt == NULL && brw_is_hiz_depth_format(brw, rb->Format)) {
 446       intel_miptree_alloc_hiz(brw, mt);
 447       if (!mt->hiz_mt)
 448          return false;
 449    }
 450
 451    return true;
 452 }
 453
 454 void
 455 intel_renderbuffer_set_draw_offset(struct intel_renderbuffer *irb)
 456 {
 457    unsigned int dst_x, dst_y;
 458
 459    /* compute offset of the particular 2D image within the texture region */
 460    intel_miptree_get_image_offset(irb->mt,
 461                                   irb->mt_level,
 462                                   irb->mt_layer,
 463                                   &dst_x, &dst_y);
 464
 465    irb->draw_x = dst_x;
 466    irb->draw_y = dst_y;
 467 }
 468
 469 /**
 470  * Called by glFramebufferTexture[123]DEXT() (and other places) to
 471  * prepare for rendering into texture memory.  This might be called
 472  * many times to choose different texture levels, cube faces, etc
 473  * before intel_finish_render_texture() is ever called.
 474  */
 475 static void
 476 intel_render_texture(struct gl_context * ctx,
 477                      struct gl_framebuffer *fb,
 478                      struct gl_renderbuffer_attachment *att)
 479 {
 480    struct brw_context *brw = brw_context(ctx);
 481    struct gl_renderbuffer *rb = att->Renderbuffer;
 482    struct intel_renderbuffer *irb = intel_renderbuffer(rb);
 483    struct gl_texture_image *image = rb->TexImage;
 484    struct intel_texture_image *intel_image = intel_texture_image(image);
 485    struct intel_mipmap_tree *mt = intel_image->mt;
 486    int layer;
 487
 488    (void) fb;
 489
 490    if (att->CubeMapFace > 0) {
 491       assert(att->Zoffset == 0);
 492       layer = att->CubeMapFace;
 493    } else {
 494       layer = att->Zoffset;
 495    }
 496
 497    if (!intel_image->mt) {
 498       /* Fallback on drawing to a texture that doesn't have a miptree
 499        * (has a border, width/height 0, etc.)
 500        */
 501       _swrast_render_texture(ctx, fb, att);
 502       return;
 503    }
 504
 505    intel_miptree_check_level_layer(mt, att->TextureLevel, layer);
 506
 507    if (!intel_renderbuffer_update_wrapper(brw, irb, image, layer)) {
 508        _swrast_render_texture(ctx, fb, att);
 509        return;
 510    }
 511
 512    DBG("Begin render %s texture tex=%u w=%d h=%d d=%d refcount=%d\n",
 513        _mesa_get_format_name(image->TexFormat),
 514        att->Texture->Name, image->Width, image->Height, image->Depth,
 515        rb->RefCount);
 516 }
 517
 518
 519 /**
 520  * Called by Mesa when rendering to a texture is done.
 521  */
 522 static void
 523 intel_finish_render_texture(struct gl_context * ctx, struct gl_renderbuffer *rb)
 524 {
 525    struct brw_context *brw = brw_context(ctx);
 526
 527    DBG("Finish render %s texture\n", _mesa_get_format_name(rb->Format));
 528
 529    /* Since we've (probably) rendered to the texture and will (likely) use
 530     * it in the texture domain later on in this batchbuffer, flush the
 531     * batch.  Once again, we wish for a domain tracker in libdrm to cover
 532     * usage inside of a batchbuffer like GEM does in the kernel.
 533     */
 534    intel_batchbuffer_emit_mi_flush(brw);
 535 }
 536
 537 #define fbo_incomplete(fb, ...) do {                                          \
 538       static GLuint msg_id = 0;                                               \
 539       if (unlikely(ctx->Const.ContextFlags & GL_CONTEXT_FLAG_DEBUG_BIT)) {    \
 540          _mesa_gl_debug(ctx, &msg_id,                                         \
 541                         MESA_DEBUG_TYPE_OTHER,                                \
 542                         MESA_DEBUG_SEVERITY_MEDIUM,                           \
 543                         __VA_ARGS__);                                         \
 544       }                                                                       \
 545       DBG(__VA_ARGS__);                                                       \
 546       fb->_Status = GL_FRAMEBUFFER_UNSUPPORTED;                               \
 547    } while (0)
 548
 549 /**
 550  * Do additional "completeness" testing of a framebuffer object.
 551  */
 552 static void
 553 intel_validate_framebuffer(struct gl_context *ctx, struct gl_framebuffer *fb)
 554 {
 555    struct brw_context *brw = brw_context(ctx);
 556    struct intel_renderbuffer *depthRb =
 557       intel_get_renderbuffer(fb, BUFFER_DEPTH);
 558    struct intel_renderbuffer *stencilRb =
 559       intel_get_renderbuffer(fb, BUFFER_STENCIL);
 560    struct intel_mipmap_tree *depth_mt = NULL, *stencil_mt = NULL;
 561    int i;
 562
 563    DBG("%s() on fb %p (%s)\n", __FUNCTION__,
 564        fb, (fb == ctx->DrawBuffer ? "drawbuffer" :
 565             (fb == ctx->ReadBuffer ? "readbuffer" : "other buffer")));
 566
 567    if (depthRb)
 568       depth_mt = depthRb->mt;
 569    if (stencilRb) {
 570       stencil_mt = stencilRb->mt;
 571       if (stencil_mt->stencil_mt)
 572          stencil_mt = stencil_mt->stencil_mt;
 573    }
 574
 575    if (depth_mt && stencil_mt) {
 576       if (brw->gen >= 7) {
 577          /* For gen >= 7, we are using the lod/minimum-array-element fields
 578           * and supportting layered rendering. This means that we must restrict
 579           * the depth & stencil attachments to match in various more retrictive
 580           * ways. (width, height, depth, LOD and layer)
 581           */
 582          if (depth_mt->physical_width0 != stencil_mt->physical_width0 ||
 583              depth_mt->physical_height0 != stencil_mt->physical_height0 ||
 584              depth_mt->physical_depth0 != stencil_mt->physical_depth0 ||
 585              depthRb->mt_level != stencilRb->mt_level ||
 586              depthRb->mt_layer != stencilRb->mt_layer) {
 587             fbo_incomplete(fb,
 588                            "FBO incomplete: depth and stencil must match in"
 589                            "width, height, depth, LOD and layer\n");
 590          }
 591       }
 592       if (depth_mt == stencil_mt) {
 593          /* For true packed depth/stencil (not faked on prefers-separate-stencil
 594           * hardware) we need to be sure they're the same level/layer, since
 595           * we'll be emitting a single packet describing the packed setup.
 596           */
 597          if (depthRb->mt_level != stencilRb->mt_level ||
 598              depthRb->mt_layer != stencilRb->mt_layer) {
 599             fbo_incomplete(fb,
 600                            "FBO incomplete: depth image level/layer %d/%d != "
 601                            "stencil image %d/%d\n",
 602                            depthRb->mt_level,
 603                            depthRb->mt_layer,
 604                            stencilRb->mt_level,
 605                            stencilRb->mt_layer);
 606          }
 607       } else {
 608          if (!brw->has_separate_stencil) {
 609             fbo_incomplete(fb, "FBO incomplete: separate stencil "
 610                            "unsupported\n");
 611          }
 612          if (stencil_mt->format != MESA_FORMAT_S_UINT8) {
 613             fbo_incomplete(fb, "FBO incomplete: separate stencil is %s "
 614                            "instead of S8\n",
 615                            _mesa_get_format_name(stencil_mt->format));
 616          }
 617          if (brw->gen < 7 && !intel_renderbuffer_has_hiz(depthRb)) {
 618             /* Before Gen7, separate depth and stencil buffers can be used
 619              * only if HiZ is enabled. From the Sandybridge PRM, Volume 2,
 620              * Part 1, Bit 3DSTATE_DEPTH_BUFFER.SeparateStencilBufferEnable:
 621              *     [DevSNB]: This field must be set to the same value (enabled
 622              *     or disabled) as Hierarchical Depth Buffer Enable.
 623              */
 624             fbo_incomplete(fb, "FBO incomplete: separate stencil "
 625                            "without HiZ\n");
 626          }
 627       }
 628    }
 629
 630    for (i = 0; i < Elements(fb->Attachment); i++) {
 631       struct gl_renderbuffer *rb;
 632       struct intel_renderbuffer *irb;
 633
 634       if (fb->Attachment[i].Type == GL_NONE)
 635          continue;
 636
 637       /* A supported attachment will have a Renderbuffer set either
 638        * from being a Renderbuffer or being a texture that got the
 639        * intel_wrap_texture() treatment.
 640        */
 641       rb = fb->Attachment[i].Renderbuffer;
 642       if (rb == NULL) {
 643          fbo_incomplete(fb, "FBO incomplete: attachment without "
 644                         "renderbuffer\n");
 645          continue;
 646       }
 647
 648       if (fb->Attachment[i].Type == GL_TEXTURE) {
 649          if (rb->TexImage->Border) {
 650             fbo_incomplete(fb, "FBO incomplete: texture with border\n");
 651             continue;
 652          }
 653       }
 654
 655       irb = intel_renderbuffer(rb);
 656       if (irb == NULL) {
 657          fbo_incomplete(fb, "FBO incomplete: software rendering "
 658                         "renderbuffer\n");
 659          continue;
 660       }
 661
 662       if (!brw_render_target_supported(brw, rb)) {
 663          fbo_incomplete(fb, "FBO incomplete: Unsupported HW "
 664                         "texture/renderbuffer format attached: %s\n",
 665                         _mesa_get_format_name(intel_rb_format(irb)));
 666       }
 667    }
 668 }
 669
 670 /**
 671  * Try to do a glBlitFramebuffer using glCopyTexSubImage2D
 672  * We can do this when the dst renderbuffer is actually a texture and
 673  * there is no scaling, mirroring or scissoring.
 674  *
 675  * \return new buffer mask indicating the buffers left to blit using the
 676  *         normal path.
 677  */
 678 static GLbitfield
 679 intel_blit_framebuffer_with_blitter(struct gl_context *ctx,
 680                                     GLint srcX0, GLint srcY0,
 681                                     GLint srcX1, GLint srcY1,
 682                                     GLint dstX0, GLint dstY0,
 683                                     GLint dstX1, GLint dstY1,
 684                                     GLbitfield mask, GLenum filter)
 685 {
 686    struct brw_context *brw = brw_context(ctx);
 687
 688    /* Sync up the state of window system buffers.  We need to do this before
 689     * we go looking for the buffers.
 690     */
 691    intel_prepare_render(brw);
 692
 693    if (mask & GL_COLOR_BUFFER_BIT) {
 694       GLint i;
 695       const struct gl_framebuffer *drawFb = ctx->DrawBuffer;
 696       const struct gl_framebuffer *readFb = ctx->ReadBuffer;
 697       struct gl_renderbuffer *src_rb = readFb->_ColorReadBuffer;
 698       struct intel_renderbuffer *src_irb = intel_renderbuffer(src_rb);
 699
 700       if (!src_irb) {
 701          perf_debug("glBlitFramebuffer(): missing src renderbuffer.  "
 702                     "Falling back to software rendering.\n");
 703          return mask;
 704       }
 705
 706       /* If the source and destination are the same size with no mirroring,
 707        * the rectangles are within the size of the texture and there is no
 708        * scissor, then we can probably use the blit engine.
 709        */
 710       if (!(srcX0 - srcX1 == dstX0 - dstX1 &&
 711             srcY0 - srcY1 == dstY0 - dstY1 &&
 712             srcX1 >= srcX0 &&
 713             srcY1 >= srcY0 &&
 714             srcX0 >= 0 && srcX1 <= readFb->Width &&
 715             srcY0 >= 0 && srcY1 <= readFb->Height &&
 716             dstX0 >= 0 && dstX1 <= drawFb->Width &&
 717             dstY0 >= 0 && dstY1 <= drawFb->Height &&
 718             !(ctx->Scissor.EnableFlags))) {
 719          perf_debug("glBlitFramebuffer(): non-1:1 blit.  "
 720                     "Falling back to software rendering.\n");
 721          return mask;
 722       }
 723
 724       /* Blit to all active draw buffers.  We don't do any pre-checking,
 725        * because we assume that copying to MRTs is rare, and failure midway
 726        * through copying is even more rare.  Even if it was to occur, it's
 727        * safe to let meta start the copy over from scratch, because
 728        * glBlitFramebuffer completely overwrites the destination pixels, and
 729        * results are undefined if any destination pixels have a dependency on
 730        * source pixels.
 731        */
 732       for (i = 0; i < ctx->DrawBuffer->_NumColorDrawBuffers; i++) {
 733          struct gl_renderbuffer *dst_rb = ctx->DrawBuffer->_ColorDrawBuffers[i];
 734          struct intel_renderbuffer *dst_irb = intel_renderbuffer(dst_rb);
 735
 736          if (!dst_irb) {
 737             perf_debug("glBlitFramebuffer(): missing dst renderbuffer.  "
 738                        "Falling back to software rendering.\n");
 739             return mask;
 740          }
 741
 742          if (!intel_miptree_blit(brw,
 743                                  src_irb->mt,
 744                                  src_irb->mt_level, src_irb->mt_layer,
 745                                  srcX0, srcY0, src_rb->Name == 0,
 746                                  dst_irb->mt,
 747                                  dst_irb->mt_level, dst_irb->mt_layer,
 748                                  dstX0, dstY0, dst_rb->Name == 0,
 749                                  dstX1 - dstX0, dstY1 - dstY0, GL_COPY)) {
 750             perf_debug("glBlitFramebuffer(): unknown blit failure.  "
 751                        "Falling back to software rendering.\n");
 752             return mask;
 753          }
 754       }
 755
 756       mask &= ~GL_COLOR_BUFFER_BIT;
 757    }
 758
 759    return mask;
 760 }
 761
 762 static void
 763 intel_blit_framebuffer(struct gl_context *ctx,
 764                        GLint srcX0, GLint srcY0, GLint srcX1, GLint srcY1,
 765                        GLint dstX0, GLint dstY0, GLint dstX1, GLint dstY1,
 766                        GLbitfield mask, GLenum filter)
 767 {
 768    mask = brw_blorp_framebuffer(brw_context(ctx),
 769                                 srcX0, srcY0, srcX1, srcY1,
 770                                 dstX0, dstY0, dstX1, dstY1,
 771                                 mask, filter);
 772    if (mask == 0x0)
 773       return;
 774
 775    /* Try using the BLT engine. */
 776    mask = intel_blit_framebuffer_with_blitter(ctx,
 777                                               srcX0, srcY0, srcX1, srcY1,
 778                                               dstX0, dstY0, dstX1, dstY1,
 779                                               mask, filter);
 780    if (mask == 0x0)
 781       return;
 782
 783
 784    _mesa_meta_BlitFramebuffer(ctx,
 785                               srcX0, srcY0, srcX1, srcY1,
 786                               dstX0, dstY0, dstX1, dstY1,
 787                               mask, filter);
 788 }
 789
 790 /**
 791  * This is a no-op except on multisample buffers shared with DRI2.
 792  */
 793 void
 794 intel_renderbuffer_set_needs_downsample(struct intel_renderbuffer *irb)
 795 {
 796    if (irb->mt && irb->mt->singlesample_mt)
 797       irb->mt->need_downsample = true;
 798 }
 799
 800 /**
 801  * Does the renderbuffer have hiz enabled?
 802  */
 803 bool
 804 intel_renderbuffer_has_hiz(struct intel_renderbuffer *irb)
 805 {
 806    return intel_miptree_slice_has_hiz(irb->mt, irb->mt_level, irb->mt_layer);
 807 }
 808
 809 bool
 810 intel_renderbuffer_resolve_hiz(struct brw_context *brw,
 811                                struct intel_renderbuffer *irb)
 812 {
 813    if (irb->mt)
 814       return intel_miptree_slice_resolve_hiz(brw,
 815                                              irb->mt,
 816                                              irb->mt_level,
 817                                              irb->mt_layer);
 818
 819    return false;
 820 }
 821
 822 void
 823 intel_renderbuffer_att_set_needs_depth_resolve(struct gl_renderbuffer_attachment *att)
 824 {
 825    struct intel_renderbuffer *irb = intel_renderbuffer(att->Renderbuffer);
 826    if (irb->mt) {
 827       if (att->Layered) {
 828          intel_miptree_set_all_slices_need_depth_resolve(irb->mt, irb->mt_level);
 829       } else {
 830          intel_miptree_slice_set_needs_depth_resolve(irb->mt,
 831                                                      irb->mt_level,
 832                                                      irb->mt_layer);
 833       }
 834    }
 835 }
 836
 837 bool
 838 intel_renderbuffer_resolve_depth(struct brw_context *brw,
 839                                  struct intel_renderbuffer *irb)
 840 {
 841    if (irb->mt)
 842       return intel_miptree_slice_resolve_depth(brw,
 843                                                irb->mt,
 844                                                irb->mt_level,
 845                                                irb->mt_layer);
 846
 847    return false;
 848 }
 849
 850 void
 851 intel_renderbuffer_move_to_temp(struct brw_context *brw,
 852                                 struct intel_renderbuffer *irb,
 853                                 bool invalidate)
 854 {
 855    struct gl_renderbuffer *rb =&irb->Base.Base;
 856    struct intel_texture_image *intel_image = intel_texture_image(rb->TexImage);
 857    struct intel_mipmap_tree *new_mt;
 858    int width, height, depth;
 859
 860    intel_miptree_get_dimensions_for_image(rb->TexImage, &width, &height, &depth);
 861
 862    new_mt = intel_miptree_create(brw, rb->TexImage->TexObject->Target,
 863                                  intel_image->base.Base.TexFormat,
 864                                  intel_image->base.Base.Level,
 865                                  intel_image->base.Base.Level,
 866                                  width, height, depth,
 867                                  true,
 868                                  irb->mt->num_samples,
 869                                  INTEL_MIPTREE_TILING_ANY);
 870
 871    if (brw_is_hiz_depth_format(brw, new_mt->format)) {
 872       intel_miptree_alloc_hiz(brw, new_mt);
 873    }
 874
 875    intel_miptree_copy_teximage(brw, intel_image, new_mt, invalidate);
 876
 877    intel_miptree_reference(&irb->mt, intel_image->mt);
 878    intel_renderbuffer_set_draw_offset(irb);
 879    intel_miptree_release(&new_mt);
 880 }
 881
 882 /**
 883  * Do one-time context initializations related to GL_EXT_framebuffer_object.
 884  * Hook in device driver functions.
 885  */
 886 void
 887 intel_fbo_init(struct brw_context *brw)
 888 {
 889    struct dd_function_table *dd = &brw->ctx.Driver;
 890    dd->NewFramebuffer = intel_new_framebuffer;
 891    dd->NewRenderbuffer = intel_new_renderbuffer;
 892    dd->MapRenderbuffer = intel_map_renderbuffer;
 893    dd->UnmapRenderbuffer = intel_unmap_renderbuffer;
 894    dd->RenderTexture = intel_render_texture;
 895    dd->FinishRenderTexture = intel_finish_render_texture;
 896    dd->ValidateFramebuffer = intel_validate_framebuffer;
 897    dd->BlitFramebuffer = intel_blit_framebuffer;
 898    dd->EGLImageTargetRenderbufferStorage =
 899       intel_image_target_renderbuffer_storage;
 900 }