src/mesa/drivers/dri/i915/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_context.h"
  44 #include "intel_batchbuffer.h"
  45 #include "intel_buffers.h"
  46 #include "intel_blit.h"
  47 #include "intel_fbo.h"
  48 #include "intel_mipmap_tree.h"
  49 #include "intel_regions.h"
  50 #include "intel_tex.h"
  51
  52 #define FILE_DEBUG_FLAG DEBUG_FBO
  53
  54 static struct gl_renderbuffer *
  55 intel_new_renderbuffer(struct gl_context * ctx, GLuint name);
  56
  57 struct intel_region*
  58 intel_get_rb_region(struct gl_framebuffer *fb, GLuint attIndex)
  59 {
  60    struct intel_renderbuffer *irb = intel_get_renderbuffer(fb, attIndex);
  61    if (irb && irb->mt)
  62       return irb->mt->region;
  63    else
  64       return NULL;
  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                        bool flip_y)
  91 {
  92    struct intel_context *intel = intel_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    /* driver does not support GL_FRAMEBUFFER_FLIP_Y_MESA */
  99    assert((rb->Name == 0) == flip_y);
 100
 101    if (srb->Buffer) {
 102       /* this is a malloc'd renderbuffer (accum buffer), not an irb */
 103       GLint bpp = _mesa_get_format_bytes(rb->Format);
 104       GLint rowStride = srb->RowStride;
 105       *out_map = (GLubyte *) srb->Buffer + y * rowStride + x * bpp;
 106       *out_stride = rowStride;
 107       return;
 108    }
 109
 110    intel_prepare_render(intel);
 111
 112    /* For a window-system renderbuffer, we need to flip the mapping we receive
 113     * upside-down.  So we need to ask for a rectangle on flipped vertically, and
 114     * we then return a pointer to the bottom of it with a negative stride.
 115     */
 116    if (rb->Name == 0) {
 117       y = rb->Height - y - h;
 118    }
 119
 120    intel_miptree_map(intel, irb->mt, irb->mt_level, irb->mt_layer,
 121                      x, y, w, h, mode, &map, &stride);
 122
 123    if (rb->Name == 0) {
 124       map += (h - 1) * stride;
 125       stride = -stride;
 126    }
 127
 128    DBG("%s: rb %d (%s) mt mapped: (%d, %d) (%dx%d) -> %p/%d\n",
 129        __func__, rb->Name, _mesa_get_format_name(rb->Format),
 130        x, y, w, h, map, stride);
 131
 132    *out_map = map;
 133    *out_stride = stride;
 134 }
 135
 136 /**
 137  * \see dd_function_table::UnmapRenderbuffer
 138  */
 139 static void
 140 intel_unmap_renderbuffer(struct gl_context *ctx,
 141                          struct gl_renderbuffer *rb)
 142 {
 143    struct intel_context *intel = intel_context(ctx);
 144    struct swrast_renderbuffer *srb = (struct swrast_renderbuffer *)rb;
 145    struct intel_renderbuffer *irb = intel_renderbuffer(rb);
 146
 147    DBG("%s: rb %d (%s)\n", __func__,
 148        rb->Name, _mesa_get_format_name(rb->Format));
 149
 150    if (srb->Buffer) {
 151       /* this is a malloc'd renderbuffer (accum buffer) */
 152       /* nothing to do */
 153       return;
 154    }
 155
 156    intel_miptree_unmap(intel, irb->mt, irb->mt_level, irb->mt_layer);
 157 }
 158
 159 static mesa_format
 160 intel_renderbuffer_format(struct gl_context * ctx, GLenum internalFormat)
 161 {
 162    struct intel_context *intel = intel_context(ctx);
 163
 164    switch (internalFormat) {
 165    default:
 166       /* Use the same format-choice logic as for textures.
 167        * Renderbuffers aren't any different from textures for us,
 168        * except they're less useful because you can't texture with
 169        * them.
 170        */
 171       return intel->ctx.Driver.ChooseTextureFormat(ctx, GL_TEXTURE_2D,
 172                                                    internalFormat,
 173                                                    GL_NONE, GL_NONE);
 174
 175    case GL_DEPTH_COMPONENT16:
 176       return MESA_FORMAT_Z_UNORM16;
 177    case GL_DEPTH_COMPONENT:
 178    case GL_DEPTH_COMPONENT24:
 179    case GL_DEPTH_COMPONENT32:
 180       return MESA_FORMAT_Z24_UNORM_X8_UINT;
 181    case GL_DEPTH_STENCIL_EXT:
 182    case GL_DEPTH24_STENCIL8_EXT:
 183    case GL_STENCIL_INDEX:
 184    case GL_STENCIL_INDEX1_EXT:
 185    case GL_STENCIL_INDEX4_EXT:
 186    case GL_STENCIL_INDEX8_EXT:
 187    case GL_STENCIL_INDEX16_EXT:
 188       /* These aren't actual texture formats, so force them here. */
 189       return MESA_FORMAT_Z24_UNORM_S8_UINT;
 190    }
 191 }
 192
 193 static GLboolean
 194 intel_alloc_private_renderbuffer_storage(struct gl_context * ctx, struct gl_renderbuffer *rb,
 195                                          GLenum internalFormat,
 196                                          GLuint width, GLuint height)
 197 {
 198    struct intel_context *intel = intel_context(ctx);
 199    struct intel_renderbuffer *irb = intel_renderbuffer(rb);
 200
 201    assert(rb->Format != MESA_FORMAT_NONE);
 202
 203    rb->Width = width;
 204    rb->Height = height;
 205    rb->_BaseFormat = _mesa_base_fbo_format(ctx, internalFormat);
 206
 207    intel_miptree_release(&irb->mt);
 208
 209    DBG("%s: %s: %s (%dx%d)\n", __func__,
 210        _mesa_enum_to_string(internalFormat),
 211        _mesa_get_format_name(rb->Format), width, height);
 212
 213    if (width == 0 || height == 0)
 214       return true;
 215
 216    irb->mt = intel_miptree_create_for_renderbuffer(intel, rb->Format,
 217                                                    width, height);
 218    if (!irb->mt)
 219       return false;
 220
 221    return true;
 222 }
 223
 224 /**
 225  * Called via glRenderbufferStorageEXT() to set the format and allocate
 226  * storage for a user-created renderbuffer.
 227  */
 228 static GLboolean
 229 intel_alloc_renderbuffer_storage(struct gl_context * ctx, struct gl_renderbuffer *rb,
 230                                  GLenum internalFormat,
 231                                  GLuint width, GLuint height)
 232 {
 233    rb->Format = intel_renderbuffer_format(ctx, internalFormat);
 234    return intel_alloc_private_renderbuffer_storage(ctx, rb, internalFormat, width, height);
 235 }
 236
 237 static void
 238 intel_image_target_renderbuffer_storage(struct gl_context *ctx,
 239                                         struct gl_renderbuffer *rb,
 240                                         void *image_handle)
 241 {
 242    struct intel_context *intel = intel_context(ctx);
 243    struct intel_renderbuffer *irb;
 244    __DRIscreen *screen;
 245    __DRIimage *image;
 246
 247    screen = intel->intelScreen->driScrnPriv;
 248    image = screen->dri2.image->lookupEGLImage(screen, image_handle,
 249                                               screen->loaderPrivate);
 250    if (image == NULL)
 251       return;
 252
 253    /* __DRIimage is opaque to the core so it has to be checked here */
 254    switch (image->format) {
 255    case MESA_FORMAT_R8G8B8A8_UNORM:
 256       _mesa_error(&intel->ctx, GL_INVALID_OPERATION,
 257             "glEGLImageTargetRenderbufferStorage(unsupported image format");
 258       return;
 259       break;
 260    default:
 261       break;
 262    }
 263
 264    irb = intel_renderbuffer(rb);
 265    intel_miptree_release(&irb->mt);
 266    irb->mt = intel_miptree_create_for_bo(intel,
 267                                          image->region->bo,
 268                                          image->format,
 269                                          image->offset,
 270                                          image->region->width,
 271                                          image->region->height,
 272                                          image->region->pitch,
 273                                          image->region->tiling);
 274    if (!irb->mt)
 275       return;
 276
 277    rb->InternalFormat = image->internal_format;
 278    rb->Width = image->region->width;
 279    rb->Height = image->region->height;
 280    rb->Format = image->format;
 281    rb->_BaseFormat = _mesa_get_format_base_format(image->format);
 282    rb->NeedsFinishRenderTexture = true;
 283 }
 284
 285 /**
 286  * Called by _mesa_resize_framebuffer() for each hardware renderbuffer when a
 287  * window system framebuffer is resized.
 288  *
 289  * Any actual buffer reallocations for hardware renderbuffers (which would
 290  * have triggered _mesa_resize_framebuffer()) were done by
 291  * intel_process_dri2_buffer().
 292  */
 293 static GLboolean
 294 intel_alloc_window_storage(UNUSED struct gl_context *ctx, struct gl_renderbuffer *rb,
 295                            GLenum internalFormat, GLuint width, GLuint height)
 296 {
 297    assert(rb->Name == 0);
 298    rb->Width = width;
 299    rb->Height = height;
 300    rb->InternalFormat = internalFormat;
 301
 302    return true;
 303 }
 304
 305 /** Dummy function for gl_renderbuffer::AllocStorage() */
 306 static GLboolean
 307 intel_nop_alloc_storage(UNUSED struct gl_context *ctx,
 308                         UNUSED struct gl_renderbuffer *rb,
 309                         UNUSED GLenum internalFormat,
 310                         UNUSED GLuint width, UNUSED GLuint height)
 311 {
 312    _mesa_problem(ctx, "intel_op_alloc_storage should never be called.");
 313    return false;
 314 }
 315
 316 /**
 317  * Create a new intel_renderbuffer which corresponds to an on-screen window,
 318  * not a user-created renderbuffer.
 319  */
 320 struct intel_renderbuffer *
 321 intel_create_renderbuffer(mesa_format format)
 322 {
 323    struct intel_renderbuffer *irb;
 324    struct gl_renderbuffer *rb;
 325
 326    GET_CURRENT_CONTEXT(ctx);
 327
 328    irb = CALLOC_STRUCT(intel_renderbuffer);
 329    if (!irb) {
 330       _mesa_error(ctx, GL_OUT_OF_MEMORY, "creating renderbuffer");
 331       return NULL;
 332    }
 333
 334    rb = &irb->Base.Base;
 335
 336    _mesa_init_renderbuffer(rb, 0);
 337    rb->ClassID = INTEL_RB_CLASS;
 338    rb->_BaseFormat = _mesa_get_format_base_format(format);
 339    rb->Format = format;
 340    rb->InternalFormat = rb->_BaseFormat;
 341
 342    /* intel-specific methods */
 343    rb->Delete = intel_delete_renderbuffer;
 344    rb->AllocStorage = intel_alloc_window_storage;
 345
 346    return irb;
 347 }
 348
 349 /**
 350  * Private window-system buffers (as opposed to ones shared with the display
 351  * server created with intel_create_renderbuffer()) are most similar in their
 352  * handling to user-created renderbuffers, but they have a resize handler that
 353  * may be called at intel_update_renderbuffers() time.
 354  */
 355 struct intel_renderbuffer *
 356 intel_create_private_renderbuffer(mesa_format format)
 357 {
 358    struct intel_renderbuffer *irb;
 359
 360    irb = intel_create_renderbuffer(format);
 361    irb->Base.Base.AllocStorage = intel_alloc_private_renderbuffer_storage;
 362
 363    return irb;
 364 }
 365
 366 /**
 367  * Create a new renderbuffer object.
 368  * Typically called via glBindRenderbufferEXT().
 369  */
 370 static struct gl_renderbuffer *
 371 intel_new_renderbuffer(struct gl_context * ctx, GLuint name)
 372 {
 373    /*struct intel_context *intel = intel_context(ctx); */
 374    struct intel_renderbuffer *irb;
 375    struct gl_renderbuffer *rb;
 376
 377    irb = CALLOC_STRUCT(intel_renderbuffer);
 378    if (!irb) {
 379       _mesa_error(ctx, GL_OUT_OF_MEMORY, "creating renderbuffer");
 380       return NULL;
 381    }
 382
 383    rb = &irb->Base.Base;
 384
 385    _mesa_init_renderbuffer(rb, name);
 386    rb->ClassID = INTEL_RB_CLASS;
 387
 388    /* intel-specific methods */
 389    rb->Delete = intel_delete_renderbuffer;
 390    rb->AllocStorage = intel_alloc_renderbuffer_storage;
 391    /* span routines set in alloc_storage function */
 392
 393    return rb;
 394 }
 395
 396
 397 /**
 398  * Called via glBindFramebufferEXT().
 399  */
 400 static void
 401 intel_bind_framebuffer(struct gl_context * ctx, GLenum target,
 402                        UNUSED struct gl_framebuffer *fb,
 403                        UNUSED struct gl_framebuffer *fbread)
 404 {
 405    if (target == GL_FRAMEBUFFER_EXT || target == GL_DRAW_FRAMEBUFFER_EXT) {
 406       intel_draw_buffer(ctx);
 407    }
 408    else {
 409       /* don't need to do anything if target == GL_READ_FRAMEBUFFER_EXT */
 410    }
 411 }
 412
 413
 414 /**
 415  * Called via glFramebufferRenderbufferEXT().
 416  */
 417 static void
 418 intel_framebuffer_renderbuffer(struct gl_context * ctx,
 419                                struct gl_framebuffer *fb,
 420                                GLenum attachment, struct gl_renderbuffer *rb)
 421 {
 422    DBG("Intel FramebufferRenderbuffer %u %u\n", fb->Name, rb ? rb->Name : 0);
 423
 424    _mesa_FramebufferRenderbuffer_sw(ctx, fb, attachment, rb);
 425    intel_draw_buffer(ctx);
 426 }
 427
 428 static bool
 429 intel_renderbuffer_update_wrapper(struct intel_renderbuffer *irb,
 430                                   struct gl_texture_image *image,
 431                                   uint32_t layer)
 432 {
 433    struct gl_renderbuffer *rb = &irb->Base.Base;
 434    struct intel_texture_image *intel_image = intel_texture_image(image);
 435    struct intel_mipmap_tree *mt = intel_image->mt;
 436    int level = image->Level;
 437
 438    rb->AllocStorage = intel_nop_alloc_storage;
 439
 440    intel_miptree_check_level_layer(mt, level, layer);
 441    irb->mt_level = level;
 442    irb->mt_layer = layer;
 443
 444    intel_miptree_reference(&irb->mt, mt);
 445
 446    intel_renderbuffer_set_draw_offset(irb);
 447
 448    return true;
 449 }
 450
 451 void
 452 intel_renderbuffer_set_draw_offset(struct intel_renderbuffer *irb)
 453 {
 454    unsigned int dst_x, dst_y;
 455
 456    /* compute offset of the particular 2D image within the texture region */
 457    intel_miptree_get_image_offset(irb->mt,
 458                                   irb->mt_level,
 459                                   irb->mt_layer,
 460                                   &dst_x, &dst_y);
 461
 462    irb->draw_x = dst_x;
 463    irb->draw_y = dst_y;
 464 }
 465
 466 /**
 467  * Called by glFramebufferTexture[123]DEXT() (and other places) to
 468  * prepare for rendering into texture memory.  This might be called
 469  * many times to choose different texture levels, cube faces, etc
 470  * before intel_finish_render_texture() is ever called.
 471  */
 472 static void
 473 intel_render_texture(struct gl_context * ctx,
 474                      struct gl_framebuffer *fb,
 475                      struct gl_renderbuffer_attachment *att)
 476 {
 477    struct gl_renderbuffer *rb = att->Renderbuffer;
 478    struct intel_renderbuffer *irb = intel_renderbuffer(rb);
 479    struct gl_texture_image *image = rb->TexImage;
 480    struct intel_texture_image *intel_image = intel_texture_image(image);
 481    struct intel_mipmap_tree *mt = intel_image->mt;
 482    int layer;
 483
 484    (void) fb;
 485
 486    if (att->CubeMapFace > 0) {
 487       assert(att->Zoffset == 0);
 488       layer = att->CubeMapFace;
 489    } else {
 490       layer = att->Zoffset;
 491    }
 492
 493    if (!intel_image->mt) {
 494       /* Fallback on drawing to a texture that doesn't have a miptree
 495        * (has a border, width/height 0, etc.)
 496        */
 497       _swrast_render_texture(ctx, fb, att);
 498       return;
 499    }
 500
 501    intel_miptree_check_level_layer(mt, att->TextureLevel, layer);
 502
 503    if (!intel_renderbuffer_update_wrapper(irb, image, layer)) {
 504        _swrast_render_texture(ctx, fb, att);
 505        return;
 506    }
 507
 508    DBG("Begin render %s texture tex=%u w=%d h=%d d=%d refcount=%d\n",
 509        _mesa_get_format_name(image->TexFormat),
 510        att->Texture->Name, image->Width, image->Height, image->Depth,
 511        rb->RefCount);
 512
 513    /* update drawing region, etc */
 514    intel_draw_buffer(ctx);
 515 }
 516
 517
 518 /**
 519  * Called by Mesa when rendering to a texture is done.
 520  */
 521 static void
 522 intel_finish_render_texture(struct gl_context * ctx, struct gl_renderbuffer *rb)
 523 {
 524    struct intel_context *intel = intel_context(ctx);
 525
 526    DBG("Finish render %s texture\n", _mesa_get_format_name(rb->Format));
 527
 528    /* Since we've (probably) rendered to the texture and will (likely) use
 529     * it in the texture domain later on in this batchbuffer, flush the
 530     * batch.  Once again, we wish for a domain tracker in libdrm to cover
 531     * usage inside of a batchbuffer like GEM does in the kernel.
 532     */
 533    intel_batchbuffer_emit_mi_flush(intel);
 534 }
 535
 536 #define fbo_incomplete(fb, ...) do {                                          \
 537       static GLuint msg_id = 0;                                               \
 538       if (unlikely(ctx->Const.ContextFlags & GL_CONTEXT_FLAG_DEBUG_BIT)) {    \
 539          _mesa_gl_debugf(ctx, &msg_id,                                        \
 540                          MESA_DEBUG_SOURCE_API,                               \
 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 intel_context *intel = intel_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", __func__,
 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
 572    if (depth_mt && stencil_mt) {
 573       /* Make sure that the depth and stencil buffers are actually the same
 574        * slice of the same miptree, since we only support packed
 575        * depth/stencil.
 576        */
 577       if (depth_mt == stencil_mt) {
 578          if (depthRb->mt_level != stencilRb->mt_level ||
 579              depthRb->mt_layer != stencilRb->mt_layer) {
 580             fbo_incomplete(fb,
 581                            "FBO incomplete: depth image level/layer %d/%d != "
 582                            "stencil image %d/%d\n",
 583                            depthRb->mt_level,
 584                            depthRb->mt_layer,
 585                            stencilRb->mt_level,
 586                            stencilRb->mt_layer);
 587          }
 588       } else {
 589          fbo_incomplete(fb, "FBO incomplete: separate stencil unsupported\n");
 590       }
 591    }
 592
 593    for (i = 0; i < ARRAY_SIZE(fb->Attachment); i++) {
 594       struct gl_renderbuffer *rb;
 595       struct intel_renderbuffer *irb;
 596
 597       if (fb->Attachment[i].Type == GL_NONE)
 598          continue;
 599
 600       /* A supported attachment will have a Renderbuffer set either
 601        * from being a Renderbuffer or being a texture that got the
 602        * intel_wrap_texture() treatment.
 603        */
 604       rb = fb->Attachment[i].Renderbuffer;
 605       if (rb == NULL) {
 606          fbo_incomplete(fb, "FBO incomplete: attachment without "
 607                         "renderbuffer\n");
 608          continue;
 609       }
 610
 611       if (fb->Attachment[i].Type == GL_TEXTURE) {
 612          if (rb->TexImage->Border) {
 613             fbo_incomplete(fb, "FBO incomplete: texture with border\n");
 614             continue;
 615          }
 616       }
 617
 618       irb = intel_renderbuffer(rb);
 619       if (irb == NULL) {
 620          fbo_incomplete(fb, "FBO incomplete: software rendering "
 621                         "renderbuffer\n");
 622          continue;
 623       }
 624
 625       if (!intel->vtbl.render_target_supported(intel, rb)) {
 626          fbo_incomplete(fb, "FBO incomplete: Unsupported HW "
 627                         "texture/renderbuffer format attached: %s\n",
 628                         _mesa_get_format_name(intel_rb_format(irb)));
 629       }
 630    }
 631 }
 632
 633 /**
 634  * Try to do a glBlitFramebuffer using glCopyTexSubImage2D
 635  * We can do this when the dst renderbuffer is actually a texture and
 636  * there is no scaling, mirroring or scissoring.
 637  *
 638  * \return new buffer mask indicating the buffers left to blit using the
 639  *         normal path.
 640  */
 641 static GLbitfield
 642 intel_blit_framebuffer_with_blitter(struct gl_context *ctx,
 643                                     const struct gl_framebuffer *readFb,
 644                                     const struct gl_framebuffer *drawFb,
 645                                     GLint srcX0, GLint srcY0,
 646                                     GLint srcX1, GLint srcY1,
 647                                     GLint dstX0, GLint dstY0,
 648                                     GLint dstX1, GLint dstY1,
 649                                     GLbitfield mask)
 650 {
 651    struct intel_context *intel = intel_context(ctx);
 652
 653    /* Sync up the state of window system buffers.  We need to do this before
 654     * we go looking for the buffers.
 655     */
 656    intel_prepare_render(intel);
 657
 658    if (mask & GL_COLOR_BUFFER_BIT) {
 659       GLint i;
 660       struct gl_renderbuffer *src_rb = readFb->_ColorReadBuffer;
 661       struct intel_renderbuffer *src_irb = intel_renderbuffer(src_rb);
 662
 663       if (!src_irb) {
 664          perf_debug("glBlitFramebuffer(): missing src renderbuffer.  "
 665                     "Falling back to software rendering.\n");
 666          return mask;
 667       }
 668
 669       /* If the source and destination are the same size with no mirroring,
 670        * the rectangles are within the size of the texture and there is no
 671        * scissor, then we can probably use the blit engine.
 672        */
 673       if (!(srcX0 - srcX1 == dstX0 - dstX1 &&
 674             srcY0 - srcY1 == dstY0 - dstY1 &&
 675             srcX1 >= srcX0 &&
 676             srcY1 >= srcY0 &&
 677             srcX0 >= 0 && srcX1 <= readFb->Width &&
 678             srcY0 >= 0 && srcY1 <= readFb->Height &&
 679             dstX0 >= 0 && dstX1 <= drawFb->Width &&
 680             dstY0 >= 0 && dstY1 <= drawFb->Height &&
 681             !ctx->Scissor.EnableFlags)) {
 682          perf_debug("glBlitFramebuffer(): non-1:1 blit.  "
 683                     "Falling back to software rendering.\n");
 684          return mask;
 685       }
 686
 687       /* Blit to all active draw buffers.  We don't do any pre-checking,
 688        * because we assume that copying to MRTs is rare, and failure midway
 689        * through copying is even more rare.  Even if it was to occur, it's
 690        * safe to let meta start the copy over from scratch, because
 691        * glBlitFramebuffer completely overwrites the destination pixels, and
 692        * results are undefined if any destination pixels have a dependency on
 693        * source pixels.
 694        */
 695       for (i = 0; i < drawFb->_NumColorDrawBuffers; i++) {
 696          struct gl_renderbuffer *dst_rb = drawFb->_ColorDrawBuffers[i];
 697          struct intel_renderbuffer *dst_irb = intel_renderbuffer(dst_rb);
 698
 699          if (!dst_irb) {
 700             perf_debug("glBlitFramebuffer(): missing dst renderbuffer.  "
 701                        "Falling back to software rendering.\n");
 702             return mask;
 703          }
 704
 705          mesa_format src_format = _mesa_get_srgb_format_linear(src_rb->Format);
 706          mesa_format dst_format = _mesa_get_srgb_format_linear(dst_rb->Format);
 707          if (src_format != dst_format) {
 708             perf_debug("glBlitFramebuffer(): unsupported blit from %s to %s.  "
 709                        "Falling back to software rendering.\n",
 710                        _mesa_get_format_name(src_format),
 711                        _mesa_get_format_name(dst_format));
 712             return mask;
 713          }
 714
 715          if (!intel_miptree_blit(intel,
 716                                  src_irb->mt,
 717                                  src_irb->mt_level, src_irb->mt_layer,
 718                                  srcX0, srcY0, src_rb->Name == 0,
 719                                  dst_irb->mt,
 720                                  dst_irb->mt_level, dst_irb->mt_layer,
 721                                  dstX0, dstY0, dst_rb->Name == 0,
 722                                  dstX1 - dstX0, dstY1 - dstY0, COLOR_LOGICOP_COPY)) {
 723             perf_debug("glBlitFramebuffer(): unknown blit failure.  "
 724                        "Falling back to software rendering.\n");
 725             return mask;
 726          }
 727       }
 728
 729       mask &= ~GL_COLOR_BUFFER_BIT;
 730    }
 731
 732    return mask;
 733 }
 734
 735 static void
 736 intel_blit_framebuffer(struct gl_context *ctx,
 737                        struct gl_framebuffer *readFb,
 738                        struct gl_framebuffer *drawFb,
 739                        GLint srcX0, GLint srcY0, GLint srcX1, GLint srcY1,
 740                        GLint dstX0, GLint dstY0, GLint dstX1, GLint dstY1,
 741                        GLbitfield mask, GLenum filter)
 742 {
 743    /* Try using the BLT engine. */
 744    mask = intel_blit_framebuffer_with_blitter(ctx, readFb, drawFb,
 745                                               srcX0, srcY0, srcX1, srcY1,
 746                                               dstX0, dstY0, dstX1, dstY1,
 747                                               mask);
 748    if (mask == 0x0)
 749       return;
 750
 751
 752    _mesa_meta_and_swrast_BlitFramebuffer(ctx, readFb, drawFb,
 753                                          srcX0, srcY0, srcX1, srcY1,
 754                                          dstX0, dstY0, dstX1, dstY1,
 755                                          mask, filter);
 756 }
 757
 758 /**
 759  * Do one-time context initializations related to GL_EXT_framebuffer_object.
 760  * Hook in device driver functions.
 761  */
 762 void
 763 intel_fbo_init(struct intel_context *intel)
 764 {
 765    intel->ctx.Driver.NewRenderbuffer = intel_new_renderbuffer;
 766    intel->ctx.Driver.MapRenderbuffer = intel_map_renderbuffer;
 767    intel->ctx.Driver.UnmapRenderbuffer = intel_unmap_renderbuffer;
 768    intel->ctx.Driver.BindFramebuffer = intel_bind_framebuffer;
 769    intel->ctx.Driver.FramebufferRenderbuffer = intel_framebuffer_renderbuffer;
 770    intel->ctx.Driver.RenderTexture = intel_render_texture;
 771    intel->ctx.Driver.FinishRenderTexture = intel_finish_render_texture;
 772    intel->ctx.Driver.ValidateFramebuffer = intel_validate_framebuffer;
 773    intel->ctx.Driver.BlitFramebuffer = intel_blit_framebuffer;
 774    intel->ctx.Driver.EGLImageTargetRenderbufferStorage =
 775       intel_image_target_renderbuffer_storage;
 776 }