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 /**
  68  * Create a new framebuffer object.
  69  */
  70 static struct gl_framebuffer *
  71 intel_new_framebuffer(struct gl_context * ctx, GLuint name)
  72 {
  73    /* Only drawable state in intel_framebuffer at this time, just use Mesa's
  74     * class
  75     */
  76    return _mesa_new_framebuffer(ctx, name);
  77 }
  78
  79
  80 /** Called by gl_renderbuffer::Delete() */
  81 static void
  82 intel_delete_renderbuffer(struct gl_context *ctx, struct gl_renderbuffer *rb)
  83 {
  84    struct intel_renderbuffer *irb = intel_renderbuffer(rb);
  85
  86    ASSERT(irb);
  87
  88    intel_miptree_release(&irb->mt);
  89
  90    _mesa_delete_renderbuffer(ctx, rb);
  91 }
  92
  93 /**
  94  * \see dd_function_table::MapRenderbuffer
  95  */
  96 static void
  97 intel_map_renderbuffer(struct gl_context *ctx,
  98                        struct gl_renderbuffer *rb,
  99                        GLuint x, GLuint y, GLuint w, GLuint h,
 100                        GLbitfield mode,
 101                        GLubyte **out_map,
 102                        GLint *out_stride)
 103 {
 104    struct intel_context *intel = intel_context(ctx);
 105    struct swrast_renderbuffer *srb = (struct swrast_renderbuffer *)rb;
 106    struct intel_renderbuffer *irb = intel_renderbuffer(rb);
 107    void *map;
 108    int stride;
 109
 110    if (srb->Buffer) {
 111       /* this is a malloc'd renderbuffer (accum buffer), not an irb */
 112       GLint bpp = _mesa_get_format_bytes(rb->Format);
 113       GLint rowStride = srb->RowStride;
 114       *out_map = (GLubyte *) srb->Buffer + y * rowStride + x * bpp;
 115       *out_stride = rowStride;
 116       return;
 117    }
 118
 119    intel_prepare_render(intel);
 120
 121    /* For a window-system renderbuffer, we need to flip the mapping we receive
 122     * upside-down.  So we need to ask for a rectangle on flipped vertically, and
 123     * we then return a pointer to the bottom of it with a negative stride.
 124     */
 125    if (rb->Name == 0) {
 126       y = rb->Height - y - h;
 127    }
 128
 129    intel_miptree_map(intel, irb->mt, irb->mt_level, irb->mt_layer,
 130                      x, y, w, h, mode, &map, &stride);
 131
 132    if (rb->Name == 0) {
 133       map += (h - 1) * stride;
 134       stride = -stride;
 135    }
 136
 137    DBG("%s: rb %d (%s) mt mapped: (%d, %d) (%dx%d) -> %p/%d\n",
 138        __FUNCTION__, rb->Name, _mesa_get_format_name(rb->Format),
 139        x, y, w, h, map, stride);
 140
 141    *out_map = map;
 142    *out_stride = stride;
 143 }
 144
 145 /**
 146  * \see dd_function_table::UnmapRenderbuffer
 147  */
 148 static void
 149 intel_unmap_renderbuffer(struct gl_context *ctx,
 150                          struct gl_renderbuffer *rb)
 151 {
 152    struct intel_context *intel = intel_context(ctx);
 153    struct swrast_renderbuffer *srb = (struct swrast_renderbuffer *)rb;
 154    struct intel_renderbuffer *irb = intel_renderbuffer(rb);
 155
 156    DBG("%s: rb %d (%s)\n", __FUNCTION__,
 157        rb->Name, _mesa_get_format_name(rb->Format));
 158
 159    if (srb->Buffer) {
 160       /* this is a malloc'd renderbuffer (accum buffer) */
 161       /* nothing to do */
 162       return;
 163    }
 164
 165    intel_miptree_unmap(intel, irb->mt, irb->mt_level, irb->mt_layer);
 166 }
 167
 168 static mesa_format
 169 intel_renderbuffer_format(struct gl_context * ctx, GLenum internalFormat)
 170 {
 171    struct intel_context *intel = intel_context(ctx);
 172
 173    switch (internalFormat) {
 174    default:
 175       /* Use the same format-choice logic as for textures.
 176        * Renderbuffers aren't any different from textures for us,
 177        * except they're less useful because you can't texture with
 178        * them.
 179        */
 180       return intel->ctx.Driver.ChooseTextureFormat(ctx, GL_TEXTURE_2D,
 181                                                    internalFormat,
 182                                                    GL_NONE, GL_NONE);
 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", __FUNCTION__,
 210        _mesa_lookup_enum_by_nr(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_base_fbo_format(&intel->ctx,
 282                                            image->internal_format);
 283    rb->NeedsFinishRenderTexture = true;
 284 }
 285
 286 /**
 287  * Called by _mesa_resize_framebuffer() for each hardware renderbuffer when a
 288  * window system framebuffer is resized.
 289  *
 290  * Any actual buffer reallocations for hardware renderbuffers (which would
 291  * have triggered _mesa_resize_framebuffer()) were done by
 292  * intel_process_dri2_buffer().
 293  */
 294 static GLboolean
 295 intel_alloc_window_storage(struct gl_context * ctx, struct gl_renderbuffer *rb,
 296                            GLenum internalFormat, GLuint width, GLuint height)
 297 {
 298    ASSERT(rb->Name == 0);
 299    rb->Width = width;
 300    rb->Height = height;
 301    rb->InternalFormat = internalFormat;
 302
 303    return true;
 304 }
 305
 306 /** Dummy function for gl_renderbuffer::AllocStorage() */
 307 static GLboolean
 308 intel_nop_alloc_storage(struct gl_context * ctx, struct gl_renderbuffer *rb,
 309                         GLenum internalFormat, GLuint width, GLuint height)
 310 {
 311    _mesa_problem(ctx, "intel_op_alloc_storage should never be called.");
 312    return false;
 313 }
 314
 315 /**
 316  * Create a new intel_renderbuffer which corresponds to an on-screen window,
 317  * not a user-created renderbuffer.
 318  */
 319 struct intel_renderbuffer *
 320 intel_create_renderbuffer(mesa_format format)
 321 {
 322    struct intel_renderbuffer *irb;
 323    struct gl_renderbuffer *rb;
 324
 325    GET_CURRENT_CONTEXT(ctx);
 326
 327    irb = CALLOC_STRUCT(intel_renderbuffer);
 328    if (!irb) {
 329       _mesa_error(ctx, GL_OUT_OF_MEMORY, "creating renderbuffer");
 330       return NULL;
 331    }
 332
 333    rb = &irb->Base.Base;
 334
 335    _mesa_init_renderbuffer(rb, 0);
 336    rb->ClassID = INTEL_RB_CLASS;
 337    rb->_BaseFormat = _mesa_get_format_base_format(format);
 338    rb->Format = format;
 339    rb->InternalFormat = rb->_BaseFormat;
 340
 341    /* intel-specific methods */
 342    rb->Delete = intel_delete_renderbuffer;
 343    rb->AllocStorage = intel_alloc_window_storage;
 344
 345    return irb;
 346 }
 347
 348 /**
 349  * Private window-system buffers (as opposed to ones shared with the display
 350  * server created with intel_create_renderbuffer()) are most similar in their
 351  * handling to user-created renderbuffers, but they have a resize handler that
 352  * may be called at intel_update_renderbuffers() time.
 353  */
 354 struct intel_renderbuffer *
 355 intel_create_private_renderbuffer(mesa_format format)
 356 {
 357    struct intel_renderbuffer *irb;
 358
 359    irb = intel_create_renderbuffer(format);
 360    irb->Base.Base.AllocStorage = intel_alloc_private_renderbuffer_storage;
 361
 362    return irb;
 363 }
 364
 365 /**
 366  * Create a new renderbuffer object.
 367  * Typically called via glBindRenderbufferEXT().
 368  */
 369 static struct gl_renderbuffer *
 370 intel_new_renderbuffer(struct gl_context * ctx, GLuint name)
 371 {
 372    /*struct intel_context *intel = intel_context(ctx); */
 373    struct intel_renderbuffer *irb;
 374    struct gl_renderbuffer *rb;
 375
 376    irb = CALLOC_STRUCT(intel_renderbuffer);
 377    if (!irb) {
 378       _mesa_error(ctx, GL_OUT_OF_MEMORY, "creating renderbuffer");
 379       return NULL;
 380    }
 381
 382    rb = &irb->Base.Base;
 383
 384    _mesa_init_renderbuffer(rb, name);
 385    rb->ClassID = INTEL_RB_CLASS;
 386
 387    /* intel-specific methods */
 388    rb->Delete = intel_delete_renderbuffer;
 389    rb->AllocStorage = intel_alloc_renderbuffer_storage;
 390    /* span routines set in alloc_storage function */
 391
 392    return rb;
 393 }
 394
 395
 396 /**
 397  * Called via glBindFramebufferEXT().
 398  */
 399 static void
 400 intel_bind_framebuffer(struct gl_context * ctx, GLenum target,
 401                        struct gl_framebuffer *fb, struct gl_framebuffer *fbread)
 402 {
 403    if (target == GL_FRAMEBUFFER_EXT || target == GL_DRAW_FRAMEBUFFER_EXT) {
 404       intel_draw_buffer(ctx);
 405    }
 406    else {
 407       /* don't need to do anything if target == GL_READ_FRAMEBUFFER_EXT */
 408    }
 409 }
 410
 411
 412 /**
 413  * Called via glFramebufferRenderbufferEXT().
 414  */
 415 static void
 416 intel_framebuffer_renderbuffer(struct gl_context * ctx,
 417                                struct gl_framebuffer *fb,
 418                                GLenum attachment, struct gl_renderbuffer *rb)
 419 {
 420    DBG("Intel FramebufferRenderbuffer %u %u\n", fb->Name, rb ? rb->Name : 0);
 421
 422    _mesa_framebuffer_renderbuffer(ctx, fb, attachment, rb);
 423    intel_draw_buffer(ctx);
 424 }
 425
 426 static bool
 427 intel_renderbuffer_update_wrapper(struct intel_context *intel,
 428                                   struct intel_renderbuffer *irb,
 429                                   struct gl_texture_image *image,
 430                                   uint32_t layer)
 431 {
 432    struct gl_renderbuffer *rb = &irb->Base.Base;
 433    struct intel_texture_image *intel_image = intel_texture_image(image);
 434    struct intel_mipmap_tree *mt = intel_image->mt;
 435    int level = image->Level;
 436
 437    rb->AllocStorage = intel_nop_alloc_storage;
 438
 439    intel_miptree_check_level_layer(mt, level, layer);
 440    irb->mt_level = level;
 441    irb->mt_layer = layer;
 442
 443    intel_miptree_reference(&irb->mt, mt);
 444
 445    intel_renderbuffer_set_draw_offset(irb);
 446
 447    return true;
 448 }
 449
 450 void
 451 intel_renderbuffer_set_draw_offset(struct intel_renderbuffer *irb)
 452 {
 453    unsigned int dst_x, dst_y;
 454
 455    /* compute offset of the particular 2D image within the texture region */
 456    intel_miptree_get_image_offset(irb->mt,
 457                                   irb->mt_level,
 458                                   irb->mt_layer,
 459                                   &dst_x, &dst_y);
 460
 461    irb->draw_x = dst_x;
 462    irb->draw_y = dst_y;
 463 }
 464
 465 /**
 466  * Called by glFramebufferTexture[123]DEXT() (and other places) to
 467  * prepare for rendering into texture memory.  This might be called
 468  * many times to choose different texture levels, cube faces, etc
 469  * before intel_finish_render_texture() is ever called.
 470  */
 471 static void
 472 intel_render_texture(struct gl_context * ctx,
 473                      struct gl_framebuffer *fb,
 474                      struct gl_renderbuffer_attachment *att)
 475 {
 476    struct intel_context *intel = intel_context(ctx);
 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(intel, 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_debug(ctx, &msg_id,                                         \
 540                         MESA_DEBUG_TYPE_OTHER,                                \
 541                         MESA_DEBUG_SEVERITY_MEDIUM,                           \
 542                         __VA_ARGS__);                                         \
 543       }                                                                       \
 544       DBG(__VA_ARGS__);                                                       \
 545       fb->_Status = GL_FRAMEBUFFER_UNSUPPORTED;                               \
 546    } while (0)
 547
 548 /**
 549  * Do additional "completeness" testing of a framebuffer object.
 550  */
 551 static void
 552 intel_validate_framebuffer(struct gl_context *ctx, struct gl_framebuffer *fb)
 553 {
 554    struct intel_context *intel = intel_context(ctx);
 555    struct intel_renderbuffer *depthRb =
 556       intel_get_renderbuffer(fb, BUFFER_DEPTH);
 557    struct intel_renderbuffer *stencilRb =
 558       intel_get_renderbuffer(fb, BUFFER_STENCIL);
 559    struct intel_mipmap_tree *depth_mt = NULL, *stencil_mt = NULL;
 560    int i;
 561
 562    DBG("%s() on fb %p (%s)\n", __FUNCTION__,
 563        fb, (fb == ctx->DrawBuffer ? "drawbuffer" :
 564             (fb == ctx->ReadBuffer ? "readbuffer" : "other buffer")));
 565
 566    if (depthRb)
 567       depth_mt = depthRb->mt;
 568    if (stencilRb)
 569       stencil_mt = stencilRb->mt;
 570
 571    if (depth_mt && stencil_mt) {
 572       /* Make sure that the depth and stencil buffers are actually the same
 573        * slice of the same miptree, since we only support packed
 574        * depth/stencil.
 575        */
 576       if (depth_mt == stencil_mt) {
 577          if (depthRb->mt_level != stencilRb->mt_level ||
 578              depthRb->mt_layer != stencilRb->mt_layer) {
 579             fbo_incomplete(fb,
 580                            "FBO incomplete: depth image level/layer %d/%d != "
 581                            "stencil image %d/%d\n",
 582                            depthRb->mt_level,
 583                            depthRb->mt_layer,
 584                            stencilRb->mt_level,
 585                            stencilRb->mt_layer);
 586          }
 587       } else {
 588          fbo_incomplete(fb, "FBO incomplete: separate stencil unsupported\n");
 589       }
 590    }
 591
 592    for (i = 0; i < Elements(fb->Attachment); i++) {
 593       struct gl_renderbuffer *rb;
 594       struct intel_renderbuffer *irb;
 595
 596       if (fb->Attachment[i].Type == GL_NONE)
 597          continue;
 598
 599       /* A supported attachment will have a Renderbuffer set either
 600        * from being a Renderbuffer or being a texture that got the
 601        * intel_wrap_texture() treatment.
 602        */
 603       rb = fb->Attachment[i].Renderbuffer;
 604       if (rb == NULL) {
 605          fbo_incomplete(fb, "FBO incomplete: attachment without "
 606                         "renderbuffer\n");
 607          continue;
 608       }
 609
 610       if (fb->Attachment[i].Type == GL_TEXTURE) {
 611          if (rb->TexImage->Border) {
 612             fbo_incomplete(fb, "FBO incomplete: texture with border\n");
 613             continue;
 614          }
 615       }
 616
 617       irb = intel_renderbuffer(rb);
 618       if (irb == NULL) {
 619          fbo_incomplete(fb, "FBO incomplete: software rendering "
 620                         "renderbuffer\n");
 621          continue;
 622       }
 623
 624       if (!intel->vtbl.render_target_supported(intel, rb)) {
 625          fbo_incomplete(fb, "FBO incomplete: Unsupported HW "
 626                         "texture/renderbuffer format attached: %s\n",
 627                         _mesa_get_format_name(intel_rb_format(irb)));
 628       }
 629    }
 630 }
 631
 632 /**
 633  * Try to do a glBlitFramebuffer using glCopyTexSubImage2D
 634  * We can do this when the dst renderbuffer is actually a texture and
 635  * there is no scaling, mirroring or scissoring.
 636  *
 637  * \return new buffer mask indicating the buffers left to blit using the
 638  *         normal path.
 639  */
 640 static GLbitfield
 641 intel_blit_framebuffer_with_blitter(struct gl_context *ctx,
 642                                     GLint srcX0, GLint srcY0,
 643                                     GLint srcX1, GLint srcY1,
 644                                     GLint dstX0, GLint dstY0,
 645                                     GLint dstX1, GLint dstY1,
 646                                     GLbitfield mask, GLenum filter)
 647 {
 648    struct intel_context *intel = intel_context(ctx);
 649
 650    if (mask & GL_COLOR_BUFFER_BIT) {
 651       GLint i;
 652       const struct gl_framebuffer *drawFb = ctx->DrawBuffer;
 653       const struct gl_framebuffer *readFb = ctx->ReadBuffer;
 654       struct gl_renderbuffer *src_rb = readFb->_ColorReadBuffer;
 655       struct intel_renderbuffer *src_irb = intel_renderbuffer(src_rb);
 656
 657       if (!src_irb) {
 658          perf_debug("glBlitFramebuffer(): missing src renderbuffer.  "
 659                     "Falling back to software rendering.\n");
 660          return mask;
 661       }
 662
 663       /* If the source and destination are the same size with no mirroring,
 664        * the rectangles are within the size of the texture and there is no
 665        * scissor, then we can probably use the blit engine.
 666        */
 667       if (!(srcX0 - srcX1 == dstX0 - dstX1 &&
 668             srcY0 - srcY1 == dstY0 - dstY1 &&
 669             srcX1 >= srcX0 &&
 670             srcY1 >= srcY0 &&
 671             srcX0 >= 0 && srcX1 <= readFb->Width &&
 672             srcY0 >= 0 && srcY1 <= readFb->Height &&
 673             dstX0 >= 0 && dstX1 <= drawFb->Width &&
 674             dstY0 >= 0 && dstY1 <= drawFb->Height &&
 675             !ctx->Scissor.EnableFlags)) {
 676          perf_debug("glBlitFramebuffer(): non-1:1 blit.  "
 677                     "Falling back to software rendering.\n");
 678          return mask;
 679       }
 680
 681       /* Blit to all active draw buffers.  We don't do any pre-checking,
 682        * because we assume that copying to MRTs is rare, and failure midway
 683        * through copying is even more rare.  Even if it was to occur, it's
 684        * safe to let meta start the copy over from scratch, because
 685        * glBlitFramebuffer completely overwrites the destination pixels, and
 686        * results are undefined if any destination pixels have a dependency on
 687        * source pixels.
 688        */
 689       for (i = 0; i < ctx->DrawBuffer->_NumColorDrawBuffers; i++) {
 690          struct gl_renderbuffer *dst_rb = ctx->DrawBuffer->_ColorDrawBuffers[i];
 691          struct intel_renderbuffer *dst_irb = intel_renderbuffer(dst_rb);
 692
 693          if (!dst_irb) {
 694             perf_debug("glBlitFramebuffer(): missing dst renderbuffer.  "
 695                        "Falling back to software rendering.\n");
 696             return mask;
 697          }
 698
 699          mesa_format src_format = _mesa_get_srgb_format_linear(src_rb->Format);
 700          mesa_format dst_format = _mesa_get_srgb_format_linear(dst_rb->Format);
 701          if (src_format != dst_format) {
 702             perf_debug("glBlitFramebuffer(): unsupported blit from %s to %s.  "
 703                        "Falling back to software rendering.\n",
 704                        _mesa_get_format_name(src_format),
 705                        _mesa_get_format_name(dst_format));
 706             return mask;
 707          }
 708
 709          if (!intel_miptree_blit(intel,
 710                                  src_irb->mt,
 711                                  src_irb->mt_level, src_irb->mt_layer,
 712                                  srcX0, srcY0, src_rb->Name == 0,
 713                                  dst_irb->mt,
 714                                  dst_irb->mt_level, dst_irb->mt_layer,
 715                                  dstX0, dstY0, dst_rb->Name == 0,
 716                                  dstX1 - dstX0, dstY1 - dstY0, GL_COPY)) {
 717             perf_debug("glBlitFramebuffer(): unknown blit failure.  "
 718                        "Falling back to software rendering.\n");
 719             return mask;
 720          }
 721       }
 722
 723       mask &= ~GL_COLOR_BUFFER_BIT;
 724    }
 725
 726    return mask;
 727 }
 728
 729 static void
 730 intel_blit_framebuffer(struct gl_context *ctx,
 731                        GLint srcX0, GLint srcY0, GLint srcX1, GLint srcY1,
 732                        GLint dstX0, GLint dstY0, GLint dstX1, GLint dstY1,
 733                        GLbitfield mask, GLenum filter)
 734 {
 735    /* Try using the BLT engine. */
 736    mask = intel_blit_framebuffer_with_blitter(ctx,
 737                                               srcX0, srcY0, srcX1, srcY1,
 738                                               dstX0, dstY0, dstX1, dstY1,
 739                                               mask, filter);
 740    if (mask == 0x0)
 741       return;
 742
 743
 744    _mesa_meta_and_swrast_BlitFramebuffer(ctx,
 745                                          srcX0, srcY0, srcX1, srcY1,
 746                                          dstX0, dstY0, dstX1, dstY1,
 747                                          mask, filter);
 748 }
 749
 750 /**
 751  * Do one-time context initializations related to GL_EXT_framebuffer_object.
 752  * Hook in device driver functions.
 753  */
 754 void
 755 intel_fbo_init(struct intel_context *intel)
 756 {
 757    intel->ctx.Driver.NewFramebuffer = intel_new_framebuffer;
 758    intel->ctx.Driver.NewRenderbuffer = intel_new_renderbuffer;
 759    intel->ctx.Driver.MapRenderbuffer = intel_map_renderbuffer;
 760    intel->ctx.Driver.UnmapRenderbuffer = intel_unmap_renderbuffer;
 761    intel->ctx.Driver.BindFramebuffer = intel_bind_framebuffer;
 762    intel->ctx.Driver.FramebufferRenderbuffer = intel_framebuffer_renderbuffer;
 763    intel->ctx.Driver.RenderTexture = intel_render_texture;
 764    intel->ctx.Driver.FinishRenderTexture = intel_finish_render_texture;
 765    intel->ctx.Driver.ValidateFramebuffer = intel_validate_framebuffer;
 766    intel->ctx.Driver.BlitFramebuffer = intel_blit_framebuffer;
 767    intel->ctx.Driver.EGLImageTargetRenderbufferStorage =
 768       intel_image_target_renderbuffer_storage;
 769 }