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

   1 /**************************************************************************
   2  *
   3  * Copyright 2006 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/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_tex.h"
  50 #include "brw_context.h"
  51
  52 #define FILE_DEBUG_FLAG DEBUG_FBO
  53
  54 /**
  55  * Create a new framebuffer object.
  56  */
  57 static struct gl_framebuffer *
  58 intel_new_framebuffer(struct gl_context * ctx, GLuint name)
  59 {
  60    /* Only drawable state in intel_framebuffer at this time, just use Mesa's
  61     * class
  62     */
  63    return _mesa_new_framebuffer(ctx, name);
  64 }
  65
  66
  67 /** Called by gl_renderbuffer::Delete() */
  68 static void
  69 intel_delete_renderbuffer(struct gl_context *ctx, struct gl_renderbuffer *rb)
  70 {
  71    struct intel_renderbuffer *irb = intel_renderbuffer(rb);
  72
  73    ASSERT(irb);
  74
  75    intel_miptree_release(&irb->mt);
  76
  77    _mesa_delete_renderbuffer(ctx, rb);
  78 }
  79
  80 /**
  81  * \see dd_function_table::MapRenderbuffer
  82  */
  83 static void
  84 intel_map_renderbuffer(struct gl_context *ctx,
  85                        struct gl_renderbuffer *rb,
  86                        GLuint x, GLuint y, GLuint w, GLuint h,
  87                        GLbitfield mode,
  88                        GLubyte **out_map,
  89                        GLint *out_stride)
  90 {
  91    struct brw_context *brw = brw_context(ctx);
  92    struct swrast_renderbuffer *srb = (struct swrast_renderbuffer *)rb;
  93    struct intel_renderbuffer *irb = intel_renderbuffer(rb);
  94    void *map;
  95    int stride;
  96
  97    if (srb->Buffer) {
  98       /* this is a malloc'd renderbuffer (accum buffer), not an irb */
  99       GLint bpp = _mesa_get_format_bytes(rb->Format);
 100       GLint rowStride = srb->RowStride;
 101       *out_map = (GLubyte *) srb->Buffer + y * rowStride + x * bpp;
 102       *out_stride = rowStride;
 103       return;
 104    }
 105
 106    intel_prepare_render(brw);
 107
 108    /* For a window-system renderbuffer, we need to flip the mapping we receive
 109     * upside-down.  So we need to ask for a rectangle on flipped vertically, and
 110     * we then return a pointer to the bottom of it with a negative stride.
 111     */
 112    if (rb->Name == 0) {
 113       y = rb->Height - y - h;
 114    }
 115
 116    intel_miptree_map(brw, irb->mt, irb->mt_level, irb->mt_layer,
 117                      x, y, w, h, mode, &map, &stride);
 118
 119    if (rb->Name == 0) {
 120       map += (h - 1) * stride;
 121       stride = -stride;
 122    }
 123
 124    DBG("%s: rb %d (%s) mt mapped: (%d, %d) (%dx%d) -> %p/%d\n",
 125        __FUNCTION__, rb->Name, _mesa_get_format_name(rb->Format),
 126        x, y, w, h, map, stride);
 127
 128    *out_map = map;
 129    *out_stride = stride;
 130 }
 131
 132 /**
 133  * \see dd_function_table::UnmapRenderbuffer
 134  */
 135 static void
 136 intel_unmap_renderbuffer(struct gl_context *ctx,
 137                          struct gl_renderbuffer *rb)
 138 {
 139    struct brw_context *brw = brw_context(ctx);
 140    struct swrast_renderbuffer *srb = (struct swrast_renderbuffer *)rb;
 141    struct intel_renderbuffer *irb = intel_renderbuffer(rb);
 142
 143    DBG("%s: rb %d (%s)\n", __FUNCTION__,
 144        rb->Name, _mesa_get_format_name(rb->Format));
 145
 146    if (srb->Buffer) {
 147       /* this is a malloc'd renderbuffer (accum buffer) */
 148       /* nothing to do */
 149       return;
 150    }
 151
 152    intel_miptree_unmap(brw, irb->mt, irb->mt_level, irb->mt_layer);
 153 }
 154
 155
 156 /**
 157  * Round up the requested multisample count to the next supported sample size.
 158  */
 159 unsigned
 160 intel_quantize_num_samples(struct intel_screen *intel, unsigned num_samples)
 161 {
 162    switch (intel->gen) {
 163    case 6:
 164       /* Gen6 supports only 4x multisampling. */
 165       if (num_samples > 0)
 166          return 4;
 167       else
 168          return 0;
 169    case 7:
 170       /* Gen7 supports 4x and 8x multisampling. */
 171       if (num_samples > 4)
 172          return 8;
 173       else if (num_samples > 0)
 174          return 4;
 175       else
 176          return 0;
 177       return 0;
 178    default:
 179       /* MSAA unsupported. */
 180       return 0;
 181    }
 182 }
 183
 184
 185 /**
 186  * Called via glRenderbufferStorageEXT() to set the format and allocate
 187  * storage for a user-created renderbuffer.
 188  */
 189 static GLboolean
 190 intel_alloc_renderbuffer_storage(struct gl_context * ctx, struct gl_renderbuffer *rb,
 191                                  GLenum internalFormat,
 192                                  GLuint width, GLuint height)
 193 {
 194    struct brw_context *brw = brw_context(ctx);
 195    struct intel_screen *screen = brw->intelScreen;
 196    struct intel_renderbuffer *irb = intel_renderbuffer(rb);
 197    rb->NumSamples = intel_quantize_num_samples(screen, rb->NumSamples);
 198
 199    switch (internalFormat) {
 200    default:
 201       /* Use the same format-choice logic as for textures.
 202        * Renderbuffers aren't any different from textures for us,
 203        * except they're less useful because you can't texture with
 204        * them.
 205        */
 206       rb->Format = ctx->Driver.ChooseTextureFormat(ctx, GL_TEXTURE_2D,
 207                                                    internalFormat,
 208                                                    GL_NONE, GL_NONE);
 209       break;
 210    case GL_STENCIL_INDEX:
 211    case GL_STENCIL_INDEX1_EXT:
 212    case GL_STENCIL_INDEX4_EXT:
 213    case GL_STENCIL_INDEX8_EXT:
 214    case GL_STENCIL_INDEX16_EXT:
 215       /* These aren't actual texture formats, so force them here. */
 216       if (brw->has_separate_stencil) {
 217          rb->Format = MESA_FORMAT_S8;
 218       } else {
 219          assert(!brw->must_use_separate_stencil);
 220          rb->Format = MESA_FORMAT_S8_Z24;
 221       }
 222       break;
 223    }
 224
 225    rb->Width = width;
 226    rb->Height = height;
 227    rb->_BaseFormat = _mesa_base_fbo_format(ctx, internalFormat);
 228
 229    intel_miptree_release(&irb->mt);
 230
 231    DBG("%s: %s: %s (%dx%d)\n", __FUNCTION__,
 232        _mesa_lookup_enum_by_nr(internalFormat),
 233        _mesa_get_format_name(rb->Format), width, height);
 234
 235    if (width == 0 || height == 0)
 236       return true;
 237
 238    irb->mt = intel_miptree_create_for_renderbuffer(brw, rb->Format,
 239                                                    width, height,
 240                                                    rb->NumSamples);
 241    if (!irb->mt)
 242       return false;
 243
 244    return true;
 245 }
 246
 247
 248 static void
 249 intel_image_target_renderbuffer_storage(struct gl_context *ctx,
 250                                         struct gl_renderbuffer *rb,
 251                                         void *image_handle)
 252 {
 253    struct brw_context *brw = brw_context(ctx);
 254    struct intel_renderbuffer *irb;
 255    __DRIscreen *screen;
 256    __DRIimage *image;
 257
 258    screen = brw->intelScreen->driScrnPriv;
 259    image = screen->dri2.image->lookupEGLImage(screen, image_handle,
 260                                               screen->loaderPrivate);
 261    if (image == NULL)
 262       return;
 263
 264    if (image->planar_format && image->planar_format->nplanes > 1) {
 265       _mesa_error(ctx, GL_INVALID_OPERATION,
 266             "glEGLImageTargetRenderbufferStorage(planar buffers are not "
 267                "supported as render targets.");
 268       return;
 269    }
 270
 271    /* Buffers originating from outside are for read-only. */
 272    if (image->dma_buf_imported) {
 273       _mesa_error(ctx, GL_INVALID_OPERATION,
 274             "glEGLImageTargetRenderbufferStorage(dma buffers are read-only)");
 275       return;
 276    }
 277
 278    /* __DRIimage is opaque to the core so it has to be checked here */
 279    switch (image->format) {
 280    case MESA_FORMAT_RGBA8888_REV:
 281       _mesa_error(ctx, GL_INVALID_OPERATION,
 282             "glEGLImageTargetRenderbufferStorage(unsupported image format");
 283       return;
 284       break;
 285    default:
 286       break;
 287    }
 288
 289    irb = intel_renderbuffer(rb);
 290    intel_miptree_release(&irb->mt);
 291    irb->mt = intel_miptree_create_for_bo(brw,
 292                                          image->region->bo,
 293                                          image->format,
 294                                          image->offset,
 295                                          image->region->width,
 296                                          image->region->height,
 297                                          image->region->pitch,
 298                                          image->region->tiling);
 299    if (!irb->mt)
 300       return;
 301
 302    rb->InternalFormat = image->internal_format;
 303    rb->Width = image->region->width;
 304    rb->Height = image->region->height;
 305    rb->Format = image->format;
 306    rb->_BaseFormat = _mesa_base_fbo_format(ctx, image->internal_format);
 307    rb->NeedsFinishRenderTexture = true;
 308 }
 309
 310 /**
 311  * Called by _mesa_resize_framebuffer() for each hardware renderbuffer when a
 312  * window system framebuffer is resized.
 313  *
 314  * Any actual buffer reallocations for hardware renderbuffers (which would
 315  * have triggered _mesa_resize_framebuffer()) were done by
 316  * intel_process_dri2_buffer().
 317  */
 318 static GLboolean
 319 intel_alloc_window_storage(struct gl_context * ctx, struct gl_renderbuffer *rb,
 320                            GLenum internalFormat, GLuint width, GLuint height)
 321 {
 322    ASSERT(rb->Name == 0);
 323    rb->Width = width;
 324    rb->Height = height;
 325    rb->InternalFormat = internalFormat;
 326
 327    return true;
 328 }
 329
 330 /** Dummy function for gl_renderbuffer::AllocStorage() */
 331 static GLboolean
 332 intel_nop_alloc_storage(struct gl_context * ctx, struct gl_renderbuffer *rb,
 333                         GLenum internalFormat, GLuint width, GLuint height)
 334 {
 335    _mesa_problem(ctx, "intel_op_alloc_storage should never be called.");
 336    return false;
 337 }
 338
 339 /**
 340  * Create a new intel_renderbuffer which corresponds to an on-screen window,
 341  * not a user-created renderbuffer.
 342  *
 343  * \param num_samples must be quantized.
 344  */
 345 struct intel_renderbuffer *
 346 intel_create_renderbuffer(gl_format format, unsigned num_samples)
 347 {
 348    struct intel_renderbuffer *irb;
 349    struct gl_renderbuffer *rb;
 350
 351    GET_CURRENT_CONTEXT(ctx);
 352
 353    irb = CALLOC_STRUCT(intel_renderbuffer);
 354    if (!irb) {
 355       _mesa_error(ctx, GL_OUT_OF_MEMORY, "creating renderbuffer");
 356       return NULL;
 357    }
 358
 359    rb = &irb->Base.Base;
 360
 361    _mesa_init_renderbuffer(rb, 0);
 362    rb->ClassID = INTEL_RB_CLASS;
 363    rb->_BaseFormat = _mesa_get_format_base_format(format);
 364    rb->Format = format;
 365    rb->InternalFormat = rb->_BaseFormat;
 366    rb->NumSamples = num_samples;
 367
 368    /* intel-specific methods */
 369    rb->Delete = intel_delete_renderbuffer;
 370    rb->AllocStorage = intel_alloc_window_storage;
 371
 372    return irb;
 373 }
 374
 375 /**
 376  * Private window-system buffers (as opposed to ones shared with the display
 377  * server created with intel_create_renderbuffer()) are most similar in their
 378  * handling to user-created renderbuffers, but they have a resize handler that
 379  * may be called at intel_update_renderbuffers() time.
 380  *
 381  * \param num_samples must be quantized.
 382  */
 383 struct intel_renderbuffer *
 384 intel_create_private_renderbuffer(gl_format format, unsigned num_samples)
 385 {
 386    struct intel_renderbuffer *irb;
 387
 388    irb = intel_create_renderbuffer(format, num_samples);
 389    irb->Base.Base.AllocStorage = intel_alloc_renderbuffer_storage;
 390
 391    return irb;
 392 }
 393
 394 /**
 395  * Create a new renderbuffer object.
 396  * Typically called via glBindRenderbufferEXT().
 397  */
 398 static struct gl_renderbuffer *
 399 intel_new_renderbuffer(struct gl_context * ctx, GLuint name)
 400 {
 401    struct intel_renderbuffer *irb;
 402    struct gl_renderbuffer *rb;
 403
 404    irb = CALLOC_STRUCT(intel_renderbuffer);
 405    if (!irb) {
 406       _mesa_error(ctx, GL_OUT_OF_MEMORY, "creating renderbuffer");
 407       return NULL;
 408    }
 409
 410    rb = &irb->Base.Base;
 411
 412    _mesa_init_renderbuffer(rb, name);
 413    rb->ClassID = INTEL_RB_CLASS;
 414
 415    /* intel-specific methods */
 416    rb->Delete = intel_delete_renderbuffer;
 417    rb->AllocStorage = intel_alloc_renderbuffer_storage;
 418    /* span routines set in alloc_storage function */
 419
 420    return rb;
 421 }
 422
 423 static bool
 424 intel_renderbuffer_update_wrapper(struct brw_context *brw,
 425                                   struct intel_renderbuffer *irb,
 426                                   struct gl_texture_image *image,
 427                                   uint32_t layer)
 428 {
 429    struct gl_renderbuffer *rb = &irb->Base.Base;
 430    struct intel_texture_image *intel_image = intel_texture_image(image);
 431    struct intel_mipmap_tree *mt = intel_image->mt;
 432    int level = image->Level;
 433
 434    rb->Depth = image->Depth;
 435
 436    rb->AllocStorage = intel_nop_alloc_storage;
 437
 438    intel_miptree_check_level_layer(mt, level, layer);
 439    irb->mt_level = level;
 440
 441    switch (mt->msaa_layout) {
 442       case INTEL_MSAA_LAYOUT_UMS:
 443       case INTEL_MSAA_LAYOUT_CMS:
 444          irb->mt_layer = layer * mt->num_samples;
 445          break;
 446
 447       default:
 448          irb->mt_layer = layer;
 449    }
 450
 451    intel_miptree_reference(&irb->mt, mt);
 452
 453    intel_renderbuffer_set_draw_offset(irb);
 454
 455    if (mt->hiz_mt == NULL && brw_is_hiz_depth_format(brw, rb->Format)) {
 456       intel_miptree_alloc_hiz(brw, mt);
 457       if (!mt->hiz_mt)
 458          return false;
 459    }
 460
 461    return true;
 462 }
 463
 464 void
 465 intel_renderbuffer_set_draw_offset(struct intel_renderbuffer *irb)
 466 {
 467    unsigned int dst_x, dst_y;
 468
 469    /* compute offset of the particular 2D image within the texture region */
 470    intel_miptree_get_image_offset(irb->mt,
 471                                   irb->mt_level,
 472                                   irb->mt_layer,
 473                                   &dst_x, &dst_y);
 474
 475    irb->draw_x = dst_x;
 476    irb->draw_y = dst_y;
 477 }
 478
 479 /**
 480  * Called by glFramebufferTexture[123]DEXT() (and other places) to
 481  * prepare for rendering into texture memory.  This might be called
 482  * many times to choose different texture levels, cube faces, etc
 483  * before intel_finish_render_texture() is ever called.
 484  */
 485 static void
 486 intel_render_texture(struct gl_context * ctx,
 487                      struct gl_framebuffer *fb,
 488                      struct gl_renderbuffer_attachment *att)
 489 {
 490    struct brw_context *brw = brw_context(ctx);
 491    struct gl_renderbuffer *rb = att->Renderbuffer;
 492    struct intel_renderbuffer *irb = intel_renderbuffer(rb);
 493    struct gl_texture_image *image = rb->TexImage;
 494    struct intel_texture_image *intel_image = intel_texture_image(image);
 495    struct intel_mipmap_tree *mt = intel_image->mt;
 496    int layer;
 497
 498    (void) fb;
 499
 500    if (att->CubeMapFace > 0) {
 501       assert(att->Zoffset == 0);
 502       layer = att->CubeMapFace;
 503    } else {
 504       layer = att->Zoffset;
 505    }
 506
 507    if (!intel_image->mt) {
 508       /* Fallback on drawing to a texture that doesn't have a miptree
 509        * (has a border, width/height 0, etc.)
 510        */
 511       _swrast_render_texture(ctx, fb, att);
 512       return;
 513    }
 514
 515    intel_miptree_check_level_layer(mt, att->TextureLevel, layer);
 516
 517    if (!intel_renderbuffer_update_wrapper(brw, irb, image, layer)) {
 518        _swrast_render_texture(ctx, fb, att);
 519        return;
 520    }
 521
 522    DBG("Begin render %s texture tex=%u w=%d h=%d d=%d refcount=%d\n",
 523        _mesa_get_format_name(image->TexFormat),
 524        att->Texture->Name, image->Width, image->Height, image->Depth,
 525        rb->RefCount);
 526 }
 527
 528
 529 /**
 530  * Called by Mesa when rendering to a texture is done.
 531  */
 532 static void
 533 intel_finish_render_texture(struct gl_context * ctx, struct gl_renderbuffer *rb)
 534 {
 535    struct brw_context *brw = brw_context(ctx);
 536
 537    DBG("Finish render %s texture\n", _mesa_get_format_name(rb->Format));
 538
 539    /* Since we've (probably) rendered to the texture and will (likely) use
 540     * it in the texture domain later on in this batchbuffer, flush the
 541     * batch.  Once again, we wish for a domain tracker in libdrm to cover
 542     * usage inside of a batchbuffer like GEM does in the kernel.
 543     */
 544    intel_batchbuffer_emit_mi_flush(brw);
 545 }
 546
 547 #define fbo_incomplete(fb, ...) do {                                          \
 548       static GLuint msg_id = 0;                                               \
 549       if (unlikely(ctx->Const.ContextFlags & GL_CONTEXT_FLAG_DEBUG_BIT)) {    \
 550          _mesa_gl_debug(ctx, &msg_id,                                         \
 551                         MESA_DEBUG_TYPE_OTHER,                                \
 552                         MESA_DEBUG_SEVERITY_MEDIUM,                           \
 553                         __VA_ARGS__);                                         \
 554       }                                                                       \
 555       DBG(__VA_ARGS__);                                                       \
 556       fb->_Status = GL_FRAMEBUFFER_UNSUPPORTED;                               \
 557    } while (0)
 558
 559 /**
 560  * Do additional "completeness" testing of a framebuffer object.
 561  */
 562 static void
 563 intel_validate_framebuffer(struct gl_context *ctx, struct gl_framebuffer *fb)
 564 {
 565    struct brw_context *brw = brw_context(ctx);
 566    struct intel_renderbuffer *depthRb =
 567       intel_get_renderbuffer(fb, BUFFER_DEPTH);
 568    struct intel_renderbuffer *stencilRb =
 569       intel_get_renderbuffer(fb, BUFFER_STENCIL);
 570    struct intel_mipmap_tree *depth_mt = NULL, *stencil_mt = NULL;
 571    int i;
 572
 573    DBG("%s() on fb %p (%s)\n", __FUNCTION__,
 574        fb, (fb == ctx->DrawBuffer ? "drawbuffer" :
 575             (fb == ctx->ReadBuffer ? "readbuffer" : "other buffer")));
 576
 577    if (depthRb)
 578       depth_mt = depthRb->mt;
 579    if (stencilRb) {
 580       stencil_mt = stencilRb->mt;
 581       if (stencil_mt->stencil_mt)
 582          stencil_mt = stencil_mt->stencil_mt;
 583    }
 584
 585    if (depth_mt && stencil_mt) {
 586       if (brw->gen >= 7) {
 587          /* For gen >= 7, we are using the lod/minimum-array-element fields
 588           * and supportting layered rendering. This means that we must restrict
 589           * the depth & stencil attachments to match in various more retrictive
 590           * ways. (width, height, depth, LOD and layer)
 591           */
 592          if (depth_mt->physical_width0 != stencil_mt->physical_width0 ||
 593              depth_mt->physical_height0 != stencil_mt->physical_height0 ||
 594              depth_mt->physical_depth0 != stencil_mt->physical_depth0 ||
 595              depthRb->mt_level != stencilRb->mt_level ||
 596              depthRb->mt_layer != stencilRb->mt_layer) {
 597             fbo_incomplete(fb,
 598                            "FBO incomplete: depth and stencil must match in"
 599                            "width, height, depth, LOD and layer\n");
 600          }
 601       }
 602       if (depth_mt == stencil_mt) {
 603          /* For true packed depth/stencil (not faked on prefers-separate-stencil
 604           * hardware) we need to be sure they're the same level/layer, since
 605           * we'll be emitting a single packet describing the packed setup.
 606           */
 607          if (depthRb->mt_level != stencilRb->mt_level ||
 608              depthRb->mt_layer != stencilRb->mt_layer) {
 609             fbo_incomplete(fb,
 610                            "FBO incomplete: depth image level/layer %d/%d != "
 611                            "stencil image %d/%d\n",
 612                            depthRb->mt_level,
 613                            depthRb->mt_layer,
 614                            stencilRb->mt_level,
 615                            stencilRb->mt_layer);
 616          }
 617       } else {
 618          if (!brw->has_separate_stencil) {
 619             fbo_incomplete(fb, "FBO incomplete: separate stencil "
 620                            "unsupported\n");
 621          }
 622          if (stencil_mt->format != MESA_FORMAT_S8) {
 623             fbo_incomplete(fb, "FBO incomplete: separate stencil is %s "
 624                            "instead of S8\n",
 625                            _mesa_get_format_name(stencil_mt->format));
 626          }
 627          if (brw->gen < 7 && !intel_renderbuffer_has_hiz(depthRb)) {
 628             /* Before Gen7, separate depth and stencil buffers can be used
 629              * only if HiZ is enabled. From the Sandybridge PRM, Volume 2,
 630              * Part 1, Bit 3DSTATE_DEPTH_BUFFER.SeparateStencilBufferEnable:
 631              *     [DevSNB]: This field must be set to the same value (enabled
 632              *     or disabled) as Hierarchical Depth Buffer Enable.
 633              */
 634             fbo_incomplete(fb, "FBO incomplete: separate stencil "
 635                            "without HiZ\n");
 636          }
 637       }
 638    }
 639
 640    for (i = 0; i < Elements(fb->Attachment); i++) {
 641       struct gl_renderbuffer *rb;
 642       struct intel_renderbuffer *irb;
 643
 644       if (fb->Attachment[i].Type == GL_NONE)
 645          continue;
 646
 647       /* A supported attachment will have a Renderbuffer set either
 648        * from being a Renderbuffer or being a texture that got the
 649        * intel_wrap_texture() treatment.
 650        */
 651       rb = fb->Attachment[i].Renderbuffer;
 652       if (rb == NULL) {
 653          fbo_incomplete(fb, "FBO incomplete: attachment without "
 654                         "renderbuffer\n");
 655          continue;
 656       }
 657
 658       if (fb->Attachment[i].Type == GL_TEXTURE) {
 659          if (rb->TexImage->Border) {
 660             fbo_incomplete(fb, "FBO incomplete: texture with border\n");
 661             continue;
 662          }
 663       }
 664
 665       irb = intel_renderbuffer(rb);
 666       if (irb == NULL) {
 667          fbo_incomplete(fb, "FBO incomplete: software rendering "
 668                         "renderbuffer\n");
 669          continue;
 670       }
 671
 672       if (!brw_render_target_supported(brw, rb)) {
 673          fbo_incomplete(fb, "FBO incomplete: Unsupported HW "
 674                         "texture/renderbuffer format attached: %s\n",
 675                         _mesa_get_format_name(intel_rb_format(irb)));
 676       }
 677    }
 678 }
 679
 680 /**
 681  * Try to do a glBlitFramebuffer using glCopyTexSubImage2D
 682  * We can do this when the dst renderbuffer is actually a texture and
 683  * there is no scaling, mirroring or scissoring.
 684  *
 685  * \return new buffer mask indicating the buffers left to blit using the
 686  *         normal path.
 687  */
 688 static GLbitfield
 689 intel_blit_framebuffer_with_blitter(struct gl_context *ctx,
 690                                     GLint srcX0, GLint srcY0,
 691                                     GLint srcX1, GLint srcY1,
 692                                     GLint dstX0, GLint dstY0,
 693                                     GLint dstX1, GLint dstY1,
 694                                     GLbitfield mask, GLenum filter)
 695 {
 696    struct brw_context *brw = brw_context(ctx);
 697
 698    /* Sync up the state of window system buffers.  We need to do this before
 699     * we go looking for the buffers.
 700     */
 701    intel_prepare_render(brw);
 702
 703    if (mask & GL_COLOR_BUFFER_BIT) {
 704       GLint i;
 705       const struct gl_framebuffer *drawFb = ctx->DrawBuffer;
 706       const struct gl_framebuffer *readFb = ctx->ReadBuffer;
 707       struct gl_renderbuffer *src_rb = readFb->_ColorReadBuffer;
 708       struct intel_renderbuffer *src_irb = intel_renderbuffer(src_rb);
 709
 710       if (!src_irb) {
 711          perf_debug("glBlitFramebuffer(): missing src renderbuffer.  "
 712                     "Falling back to software rendering.\n");
 713          return mask;
 714       }
 715
 716       /* If the source and destination are the same size with no mirroring,
 717        * the rectangles are within the size of the texture and there is no
 718        * scissor, then we can probably use the blit engine.
 719        */
 720       if (!(srcX0 - srcX1 == dstX0 - dstX1 &&
 721             srcY0 - srcY1 == dstY0 - dstY1 &&
 722             srcX1 >= srcX0 &&
 723             srcY1 >= srcY0 &&
 724             srcX0 >= 0 && srcX1 <= readFb->Width &&
 725             srcY0 >= 0 && srcY1 <= readFb->Height &&
 726             dstX0 >= 0 && dstX1 <= drawFb->Width &&
 727             dstY0 >= 0 && dstY1 <= drawFb->Height &&
 728             !ctx->Scissor.Enabled)) {
 729          perf_debug("glBlitFramebuffer(): non-1:1 blit.  "
 730                     "Falling back to software rendering.\n");
 731          return mask;
 732       }
 733
 734       /* Blit to all active draw buffers.  We don't do any pre-checking,
 735        * because we assume that copying to MRTs is rare, and failure midway
 736        * through copying is even more rare.  Even if it was to occur, it's
 737        * safe to let meta start the copy over from scratch, because
 738        * glBlitFramebuffer completely overwrites the destination pixels, and
 739        * results are undefined if any destination pixels have a dependency on
 740        * source pixels.
 741        */
 742       for (i = 0; i < ctx->DrawBuffer->_NumColorDrawBuffers; i++) {
 743          struct gl_renderbuffer *dst_rb = ctx->DrawBuffer->_ColorDrawBuffers[i];
 744          struct intel_renderbuffer *dst_irb = intel_renderbuffer(dst_rb);
 745
 746          if (!dst_irb) {
 747             perf_debug("glBlitFramebuffer(): missing dst renderbuffer.  "
 748                        "Falling back to software rendering.\n");
 749             return mask;
 750          }
 751
 752          gl_format src_format = _mesa_get_srgb_format_linear(src_rb->Format);
 753          gl_format dst_format = _mesa_get_srgb_format_linear(dst_rb->Format);
 754          if (src_format != dst_format) {
 755             perf_debug("glBlitFramebuffer(): unsupported blit from %s to %s.  "
 756                        "Falling back to software rendering.\n",
 757                        _mesa_get_format_name(src_format),
 758                        _mesa_get_format_name(dst_format));
 759             return mask;
 760          }
 761
 762          if (!intel_miptree_blit(brw,
 763                                  src_irb->mt,
 764                                  src_irb->mt_level, src_irb->mt_layer,
 765                                  srcX0, srcY0, src_rb->Name == 0,
 766                                  dst_irb->mt,
 767                                  dst_irb->mt_level, dst_irb->mt_layer,
 768                                  dstX0, dstY0, dst_rb->Name == 0,
 769                                  dstX1 - dstX0, dstY1 - dstY0, GL_COPY)) {
 770             perf_debug("glBlitFramebuffer(): unknown blit failure.  "
 771                        "Falling back to software rendering.\n");
 772             return mask;
 773          }
 774       }
 775
 776       mask &= ~GL_COLOR_BUFFER_BIT;
 777    }
 778
 779    return mask;
 780 }
 781
 782 static void
 783 intel_blit_framebuffer(struct gl_context *ctx,
 784                        GLint srcX0, GLint srcY0, GLint srcX1, GLint srcY1,
 785                        GLint dstX0, GLint dstY0, GLint dstX1, GLint dstY1,
 786                        GLbitfield mask, GLenum filter)
 787 {
 788    mask = brw_blorp_framebuffer(brw_context(ctx),
 789                                 srcX0, srcY0, srcX1, srcY1,
 790                                 dstX0, dstY0, dstX1, dstY1,
 791                                 mask, filter);
 792    if (mask == 0x0)
 793       return;
 794
 795    /* Try using the BLT engine. */
 796    mask = intel_blit_framebuffer_with_blitter(ctx,
 797                                               srcX0, srcY0, srcX1, srcY1,
 798                                               dstX0, dstY0, dstX1, dstY1,
 799                                               mask, filter);
 800    if (mask == 0x0)
 801       return;
 802
 803
 804    _mesa_meta_BlitFramebuffer(ctx,
 805                               srcX0, srcY0, srcX1, srcY1,
 806                               dstX0, dstY0, dstX1, dstY1,
 807                               mask, filter);
 808 }
 809
 810 /**
 811  * This is a no-op except on multisample buffers shared with DRI2.
 812  */
 813 void
 814 intel_renderbuffer_set_needs_downsample(struct intel_renderbuffer *irb)
 815 {
 816    if (irb->mt && irb->mt->singlesample_mt)
 817       irb->mt->need_downsample = true;
 818 }
 819
 820 /**
 821  * Does the renderbuffer have hiz enabled?
 822  */
 823 bool
 824 intel_renderbuffer_has_hiz(struct intel_renderbuffer *irb)
 825 {
 826    return intel_miptree_slice_has_hiz(irb->mt, irb->mt_level, irb->mt_layer);
 827 }
 828
 829 bool
 830 intel_renderbuffer_resolve_hiz(struct brw_context *brw,
 831                                struct intel_renderbuffer *irb)
 832 {
 833    if (irb->mt)
 834       return intel_miptree_slice_resolve_hiz(brw,
 835                                              irb->mt,
 836                                              irb->mt_level,
 837                                              irb->mt_layer);
 838
 839    return false;
 840 }
 841
 842 void
 843 intel_renderbuffer_att_set_needs_depth_resolve(struct gl_renderbuffer_attachment *att)
 844 {
 845    struct intel_renderbuffer *irb = intel_renderbuffer(att->Renderbuffer);
 846    if (irb->mt) {
 847       if (att->Layered) {
 848          intel_miptree_set_all_slices_need_depth_resolve(irb->mt, irb->mt_level);
 849       } else {
 850          intel_miptree_slice_set_needs_depth_resolve(irb->mt,
 851                                                      irb->mt_level,
 852                                                      irb->mt_layer);
 853       }
 854    }
 855 }
 856
 857 bool
 858 intel_renderbuffer_resolve_depth(struct brw_context *brw,
 859                                  struct intel_renderbuffer *irb)
 860 {
 861    if (irb->mt)
 862       return intel_miptree_slice_resolve_depth(brw,
 863                                                irb->mt,
 864                                                irb->mt_level,
 865                                                irb->mt_layer);
 866
 867    return false;
 868 }
 869
 870 void
 871 intel_renderbuffer_move_to_temp(struct brw_context *brw,
 872                                 struct intel_renderbuffer *irb,
 873                                 bool invalidate)
 874 {
 875    struct gl_renderbuffer *rb =&irb->Base.Base;
 876    struct intel_texture_image *intel_image = intel_texture_image(rb->TexImage);
 877    struct intel_mipmap_tree *new_mt;
 878    int width, height, depth;
 879
 880    intel_miptree_get_dimensions_for_image(rb->TexImage, &width, &height, &depth);
 881
 882    new_mt = intel_miptree_create(brw, rb->TexImage->TexObject->Target,
 883                                  intel_image->base.Base.TexFormat,
 884                                  intel_image->base.Base.Level,
 885                                  intel_image->base.Base.Level,
 886                                  width, height, depth,
 887                                  true,
 888                                  irb->mt->num_samples,
 889                                  INTEL_MIPTREE_TILING_ANY);
 890
 891    if (brw_is_hiz_depth_format(brw, new_mt->format)) {
 892       intel_miptree_alloc_hiz(brw, new_mt);
 893    }
 894
 895    intel_miptree_copy_teximage(brw, intel_image, new_mt, invalidate);
 896
 897    intel_miptree_reference(&irb->mt, intel_image->mt);
 898    intel_renderbuffer_set_draw_offset(irb);
 899    intel_miptree_release(&new_mt);
 900 }
 901
 902 /**
 903  * Do one-time context initializations related to GL_EXT_framebuffer_object.
 904  * Hook in device driver functions.
 905  */
 906 void
 907 intel_fbo_init(struct brw_context *brw)
 908 {
 909    struct dd_function_table *dd = &brw->ctx.Driver;
 910    dd->NewFramebuffer = intel_new_framebuffer;
 911    dd->NewRenderbuffer = intel_new_renderbuffer;
 912    dd->MapRenderbuffer = intel_map_renderbuffer;
 913    dd->UnmapRenderbuffer = intel_unmap_renderbuffer;
 914    dd->RenderTexture = intel_render_texture;
 915    dd->FinishRenderTexture = intel_finish_render_texture;
 916    dd->ValidateFramebuffer = intel_validate_framebuffer;
 917    dd->BlitFramebuffer = intel_blit_framebuffer;
 918    dd->EGLImageTargetRenderbufferStorage =
 919       intel_image_target_renderbuffer_storage;
 920 }