src/mesa/main/fbobject.c

   1 /*
   2  * Mesa 3-D graphics library
   3  * Version:  7.1
   4  *
   5  * Copyright (C) 1999-2008  Brian Paul   All Rights Reserved.
   6  * Copyright (C) 1999-2009  VMware, Inc.  All Rights Reserved.
   7  *
   8  * Permission is hereby granted, free of charge, to any person obtaining a
   9  * copy of this software and associated documentation files (the "Software"),
  10  * to deal in the Software without restriction, including without limitation
  11  * the rights to use, copy, modify, merge, publish, distribute, sublicense,
  12  * and/or sell copies of the Software, and to permit persons to whom the
  13  * Software is furnished to do so, subject to the following conditions:
  14  *
  15  * The above copyright notice and this permission notice shall be included
  16  * in all copies or substantial portions 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 MERCHANTABILITY,
  20  * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT.  IN NO EVENT SHALL
  21  * BRIAN PAUL BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN
  22  * AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN
  23  * CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE.
  24  */
  25
  26
  27 /*
  28  * GL_EXT/ARB_framebuffer_object extensions
  29  *
  30  * Authors:
  31  *   Brian Paul
  32  */
  33
  34
  35 #include "buffers.h"
  36 #include "context.h"
  37 #include "enums.h"
  38 #include "fbobject.h"
  39 #include "formats.h"
  40 #include "framebuffer.h"
  41 #include "hash.h"
  42 #include "macros.h"
  43 #include "mipmap.h"
  44 #include "renderbuffer.h"
  45 #include "state.h"
  46 #include "teximage.h"
  47 #include "texobj.h"
  48 #include "texstore.h"
  49 #include "texstate.h"
  50
  51
  52 /** Set this to 1 to help debug FBO incompleteness problems */
  53 #define DEBUG_FBO 0
  54
  55 /** Set this to 1 to debug/log glBlitFramebuffer() calls */
  56 #define DEBUG_BLIT 0
  57
  58
  59 /**
  60  * Notes:
  61  *
  62  * None of the GL_EXT_framebuffer_object functions are compiled into
  63  * display lists.
  64  */
  65
  66
  67
  68 /*
  69  * When glGenRender/FramebuffersEXT() is called we insert pointers to
  70  * these placeholder objects into the hash table.
  71  * Later, when the object ID is first bound, we replace the placeholder
  72  * with the real frame/renderbuffer.
  73  */
  74 static struct gl_framebuffer DummyFramebuffer;
  75 static struct gl_renderbuffer DummyRenderbuffer;
  76
  77
  78 #define IS_CUBE_FACE(TARGET) \
  79    ((TARGET) >= GL_TEXTURE_CUBE_MAP_POSITIVE_X && \
  80     (TARGET) <= GL_TEXTURE_CUBE_MAP_NEGATIVE_Z)
  81
  82
  83 static void
  84 delete_dummy_renderbuffer(struct gl_renderbuffer *rb)
  85 {
  86    /* no op */
  87 }
  88
  89 static void
  90 delete_dummy_framebuffer(struct gl_framebuffer *fb)
  91 {
  92    /* no op */
  93 }
  94
  95
  96 void
  97 _mesa_init_fbobjects(GLcontext *ctx)
  98 {
  99    DummyFramebuffer.Delete = delete_dummy_framebuffer;
 100    DummyRenderbuffer.Delete = delete_dummy_renderbuffer;
 101 }
 102
 103
 104 /**
 105  * Helper routine for getting a gl_renderbuffer.
 106  */
 107 struct gl_renderbuffer *
 108 _mesa_lookup_renderbuffer(GLcontext *ctx, GLuint id)
 109 {
 110    struct gl_renderbuffer *rb;
 111
 112    if (id == 0)
 113       return NULL;
 114
 115    rb = (struct gl_renderbuffer *)
 116       _mesa_HashLookup(ctx->Shared->RenderBuffers, id);
 117    return rb;
 118 }
 119
 120
 121 /**
 122  * Helper routine for getting a gl_framebuffer.
 123  */
 124 struct gl_framebuffer *
 125 _mesa_lookup_framebuffer(GLcontext *ctx, GLuint id)
 126 {
 127    struct gl_framebuffer *fb;
 128
 129    if (id == 0)
 130       return NULL;
 131
 132    fb = (struct gl_framebuffer *)
 133       _mesa_HashLookup(ctx->Shared->FrameBuffers, id);
 134    return fb;
 135 }
 136
 137
 138 /**
 139  * Mark the given framebuffer as invalid.  This will force the
 140  * test for framebuffer completeness to be done before the framebuffer
 141  * is used.
 142  */
 143 static void
 144 invalidate_framebuffer(struct gl_framebuffer *fb)
 145 {
 146    fb->_Status = 0; /* "indeterminate" */
 147 }
 148
 149
 150 /**
 151  * Given a GL_*_ATTACHMENTn token, return a pointer to the corresponding
 152  * gl_renderbuffer_attachment object.
 153  * If \p attachment is GL_DEPTH_STENCIL_ATTACHMENT, return a pointer to
 154  * the depth buffer attachment point.
 155  */
 156 struct gl_renderbuffer_attachment *
 157 _mesa_get_attachment(GLcontext *ctx, struct gl_framebuffer *fb,
 158                      GLenum attachment)
 159 {
 160    GLuint i;
 161
 162    switch (attachment) {
 163    case GL_COLOR_ATTACHMENT0_EXT:
 164    case GL_COLOR_ATTACHMENT1_EXT:
 165    case GL_COLOR_ATTACHMENT2_EXT:
 166    case GL_COLOR_ATTACHMENT3_EXT:
 167    case GL_COLOR_ATTACHMENT4_EXT:
 168    case GL_COLOR_ATTACHMENT5_EXT:
 169    case GL_COLOR_ATTACHMENT6_EXT:
 170    case GL_COLOR_ATTACHMENT7_EXT:
 171    case GL_COLOR_ATTACHMENT8_EXT:
 172    case GL_COLOR_ATTACHMENT9_EXT:
 173    case GL_COLOR_ATTACHMENT10_EXT:
 174    case GL_COLOR_ATTACHMENT11_EXT:
 175    case GL_COLOR_ATTACHMENT12_EXT:
 176    case GL_COLOR_ATTACHMENT13_EXT:
 177    case GL_COLOR_ATTACHMENT14_EXT:
 178    case GL_COLOR_ATTACHMENT15_EXT:
 179       i = attachment - GL_COLOR_ATTACHMENT0_EXT;
 180       if (i >= ctx->Const.MaxColorAttachments) {
 181          return NULL;
 182       }
 183       return &fb->Attachment[BUFFER_COLOR0 + i];
 184    case GL_DEPTH_STENCIL_ATTACHMENT:
 185       /* fall-through */
 186    case GL_DEPTH_ATTACHMENT_EXT:
 187       return &fb->Attachment[BUFFER_DEPTH];
 188    case GL_STENCIL_ATTACHMENT_EXT:
 189       return &fb->Attachment[BUFFER_STENCIL];
 190    default:
 191       return NULL;
 192    }
 193 }
 194
 195
 196 /**
 197  * Remove any texture or renderbuffer attached to the given attachment
 198  * point.  Update reference counts, etc.
 199  */
 200 void
 201 _mesa_remove_attachment(GLcontext *ctx, struct gl_renderbuffer_attachment *att)
 202 {
 203    if (att->Type == GL_TEXTURE) {
 204       ASSERT(att->Texture);
 205       if (ctx->Driver.FinishRenderTexture) {
 206          /* tell driver that we're done rendering to this texture. */
 207          ctx->Driver.FinishRenderTexture(ctx, att);
 208       }
 209       _mesa_reference_texobj(&att->Texture, NULL); /* unbind */
 210       ASSERT(!att->Texture);
 211    }
 212    if (att->Type == GL_TEXTURE || att->Type == GL_RENDERBUFFER_EXT) {
 213       ASSERT(!att->Texture);
 214       _mesa_reference_renderbuffer(&att->Renderbuffer, NULL); /* unbind */
 215       ASSERT(!att->Renderbuffer);
 216    }
 217    att->Type = GL_NONE;
 218    att->Complete = GL_TRUE;
 219 }
 220
 221
 222 /**
 223  * Bind a texture object to an attachment point.
 224  * The previous binding, if any, will be removed first.
 225  */
 226 void
 227 _mesa_set_texture_attachment(GLcontext *ctx,
 228                              struct gl_framebuffer *fb,
 229                              struct gl_renderbuffer_attachment *att,
 230                              struct gl_texture_object *texObj,
 231                              GLenum texTarget, GLuint level, GLuint zoffset)
 232 {
 233    if (att->Texture == texObj) {
 234       /* re-attaching same texture */
 235       ASSERT(att->Type == GL_TEXTURE);
 236       if (ctx->Driver.FinishRenderTexture)
 237          ctx->Driver.FinishRenderTexture(ctx, att);
 238    }
 239    else {
 240       /* new attachment */
 241       if (ctx->Driver.FinishRenderTexture && att->Texture)
 242          ctx->Driver.FinishRenderTexture(ctx, att);
 243       _mesa_remove_attachment(ctx, att);
 244       att->Type = GL_TEXTURE;
 245       assert(!att->Texture);
 246       _mesa_reference_texobj(&att->Texture, texObj);
 247    }
 248
 249    /* always update these fields */
 250    att->TextureLevel = level;
 251    att->CubeMapFace = _mesa_tex_target_to_face(texTarget);
 252    att->Zoffset = zoffset;
 253    att->Complete = GL_FALSE;
 254
 255    if (att->Texture->Image[att->CubeMapFace][att->TextureLevel]) {
 256       ctx->Driver.RenderTexture(ctx, fb, att);
 257    }
 258
 259    invalidate_framebuffer(fb);
 260 }
 261
 262
 263 /**
 264  * Bind a renderbuffer to an attachment point.
 265  * The previous binding, if any, will be removed first.
 266  */
 267 void
 268 _mesa_set_renderbuffer_attachment(GLcontext *ctx,
 269                                   struct gl_renderbuffer_attachment *att,
 270                                   struct gl_renderbuffer *rb)
 271 {
 272    /* XXX check if re-doing same attachment, exit early */
 273    _mesa_remove_attachment(ctx, att);
 274    att->Type = GL_RENDERBUFFER_EXT;
 275    att->Texture = NULL; /* just to be safe */
 276    att->Complete = GL_FALSE;
 277    _mesa_reference_renderbuffer(&att->Renderbuffer, rb);
 278 }
 279
 280
 281 /**
 282  * Fallback for ctx->Driver.FramebufferRenderbuffer()
 283  * Attach a renderbuffer object to a framebuffer object.
 284  */
 285 void
 286 _mesa_framebuffer_renderbuffer(GLcontext *ctx, struct gl_framebuffer *fb,
 287                                GLenum attachment, struct gl_renderbuffer *rb)
 288 {
 289    struct gl_renderbuffer_attachment *att;
 290
 291    _glthread_LOCK_MUTEX(fb->Mutex);
 292
 293    att = _mesa_get_attachment(ctx, fb, attachment);
 294    ASSERT(att);
 295    if (rb) {
 296       _mesa_set_renderbuffer_attachment(ctx, att, rb);
 297       if (attachment == GL_DEPTH_STENCIL_ATTACHMENT) {
 298          /* do stencil attachment here (depth already done above) */
 299          att = _mesa_get_attachment(ctx, fb, GL_STENCIL_ATTACHMENT_EXT);
 300          assert(att);
 301          _mesa_set_renderbuffer_attachment(ctx, att, rb);
 302       }
 303    }
 304    else {
 305       _mesa_remove_attachment(ctx, att);
 306    }
 307
 308    invalidate_framebuffer(fb);
 309
 310    _glthread_UNLOCK_MUTEX(fb->Mutex);
 311 }
 312
 313
 314 /**
 315  * For debug only.
 316  */
 317 static void
 318 att_incomplete(const char *msg)
 319 {
 320 #if DEBUG_FBO
 321    _mesa_debug(NULL, "attachment incomplete: %s\n", msg);
 322 #else
 323    (void) msg;
 324 #endif
 325 }
 326
 327
 328 /**
 329  * For debug only.
 330  */
 331 static void
 332 fbo_incomplete(const char *msg, int index)
 333 {
 334 #if DEBUG_FBO
 335    _mesa_debug(NULL, "FBO Incomplete: %s [%d]\n", msg, index);
 336 #else
 337    (void) msg;
 338    (void) index;
 339 #endif
 340 }
 341
 342
 343
 344
 345 /**
 346  * Test if an attachment point is complete and update its Complete field.
 347  * \param format if GL_COLOR, this is a color attachment point,
 348  *               if GL_DEPTH, this is a depth component attachment point,
 349  *               if GL_STENCIL, this is a stencil component attachment point.
 350  */
 351 static void
 352 test_attachment_completeness(const GLcontext *ctx, GLenum format,
 353                              struct gl_renderbuffer_attachment *att)
 354 {
 355    assert(format == GL_COLOR || format == GL_DEPTH || format == GL_STENCIL);
 356
 357    /* assume complete */
 358    att->Complete = GL_TRUE;
 359
 360    /* Look for reasons why the attachment might be incomplete */
 361    if (att->Type == GL_TEXTURE) {
 362       const struct gl_texture_object *texObj = att->Texture;
 363       struct gl_texture_image *texImage;
 364       GLenum baseFormat;
 365
 366       if (!texObj) {
 367          att_incomplete("no texobj");
 368          att->Complete = GL_FALSE;
 369          return;
 370       }
 371
 372       texImage = texObj->Image[att->CubeMapFace][att->TextureLevel];
 373       if (!texImage) {
 374          att_incomplete("no teximage");
 375          att->Complete = GL_FALSE;
 376          return;
 377       }
 378       if (texImage->Width < 1 || texImage->Height < 1) {
 379          att_incomplete("teximage width/height=0");
 380          _mesa_printf("texobj = %u\n", texObj->Name);
 381          _mesa_printf("level = %d\n", att->TextureLevel);
 382          att->Complete = GL_FALSE;
 383          return;
 384       }
 385       if (texObj->Target == GL_TEXTURE_3D && att->Zoffset >= texImage->Depth) {
 386          att_incomplete("bad z offset");
 387          att->Complete = GL_FALSE;
 388          return;
 389       }
 390
 391       baseFormat = _mesa_get_format_base_format(texImage->TexFormat);
 392
 393       if (format == GL_COLOR) {
 394          if (baseFormat != GL_RGB &&
 395              baseFormat != GL_RGBA) {
 396             att_incomplete("bad format");
 397             att->Complete = GL_FALSE;
 398             return;
 399          }
 400          if (_mesa_is_format_compressed(texImage->TexFormat)) {
 401             att_incomplete("compressed internalformat");
 402             att->Complete = GL_FALSE;
 403             return;
 404          }
 405       }
 406       else if (format == GL_DEPTH) {
 407          if (baseFormat == GL_DEPTH_COMPONENT) {
 408             /* OK */
 409          }
 410          else if (ctx->Extensions.EXT_packed_depth_stencil &&
 411                   ctx->Extensions.ARB_depth_texture &&
 412                   baseFormat == GL_DEPTH_STENCIL_EXT) {
 413             /* OK */
 414          }
 415          else {
 416             att->Complete = GL_FALSE;
 417             att_incomplete("bad depth format");
 418             return;
 419          }
 420       }
 421       else {
 422          ASSERT(format == GL_STENCIL);
 423          if (ctx->Extensions.EXT_packed_depth_stencil &&
 424              ctx->Extensions.ARB_depth_texture &&
 425              baseFormat == GL_DEPTH_STENCIL_EXT) {
 426             /* OK */
 427          }
 428          else {
 429             /* no such thing as stencil-only textures */
 430             att_incomplete("illegal stencil texture");
 431             att->Complete = GL_FALSE;
 432             return;
 433          }
 434       }
 435    }
 436    else if (att->Type == GL_RENDERBUFFER_EXT) {
 437       const GLenum baseFormat =
 438          _mesa_get_format_base_format(att->Renderbuffer->Format);
 439
 440       ASSERT(att->Renderbuffer);
 441       if (!att->Renderbuffer->InternalFormat ||
 442           att->Renderbuffer->Width < 1 ||
 443           att->Renderbuffer->Height < 1) {
 444          att_incomplete("0x0 renderbuffer");
 445          att->Complete = GL_FALSE;
 446          return;
 447       }
 448       if (format == GL_COLOR) {
 449          if (baseFormat != GL_RGB &&
 450              baseFormat != GL_RGBA) {
 451             att_incomplete("bad renderbuffer color format");
 452             att->Complete = GL_FALSE;
 453             return;
 454          }
 455       }
 456       else if (format == GL_DEPTH) {
 457          if (baseFormat == GL_DEPTH_COMPONENT) {
 458             /* OK */
 459          }
 460          else if (ctx->Extensions.EXT_packed_depth_stencil &&
 461                   baseFormat == GL_DEPTH_STENCIL_EXT) {
 462             /* OK */
 463          }
 464          else {
 465             att_incomplete("bad renderbuffer depth format");
 466             att->Complete = GL_FALSE;
 467             return;
 468          }
 469       }
 470       else {
 471          assert(format == GL_STENCIL);
 472          if (baseFormat == GL_STENCIL_INDEX) {
 473             /* OK */
 474          }
 475          else if (ctx->Extensions.EXT_packed_depth_stencil &&
 476                   baseFormat == GL_DEPTH_STENCIL_EXT) {
 477             /* OK */
 478          }
 479          else {
 480             att->Complete = GL_FALSE;
 481             att_incomplete("bad renderbuffer stencil format");
 482             return;
 483          }
 484       }
 485    }
 486    else {
 487       ASSERT(att->Type == GL_NONE);
 488       /* complete */
 489       return;
 490    }
 491 }
 492
 493
 494 /**
 495  * Test if the given framebuffer object is complete and update its
 496  * Status field with the results.
 497  * Calls the ctx->Driver.ValidateFramebuffer() function to allow the
 498  * driver to make hardware-specific validation/completeness checks.
 499  * Also update the framebuffer's Width and Height fields if the
 500  * framebuffer is complete.
 501  */
 502 void
 503 _mesa_test_framebuffer_completeness(GLcontext *ctx, struct gl_framebuffer *fb)
 504 {
 505    GLuint numImages;
 506    GLenum intFormat = GL_NONE; /* color buffers' internal format */
 507    GLuint minWidth = ~0, minHeight = ~0, maxWidth = 0, maxHeight = 0;
 508    GLint numSamples = -1;
 509    GLint i;
 510    GLuint j;
 511
 512    assert(fb->Name != 0);
 513
 514    numImages = 0;
 515    fb->Width = 0;
 516    fb->Height = 0;
 517
 518    /* Start at -2 to more easily loop over all attachment points.
 519     *  -2: depth buffer
 520     *  -1: stencil buffer
 521     * >=0: color buffer
 522     */
 523    for (i = -2; i < (GLint) ctx->Const.MaxColorAttachments; i++) {
 524       struct gl_renderbuffer_attachment *att;
 525       GLenum f;
 526
 527       /*
 528        * XXX for ARB_fbo, only check color buffers that are named by
 529        * GL_READ_BUFFER and GL_DRAW_BUFFERi.
 530        */
 531
 532       /* check for attachment completeness
 533        */
 534       if (i == -2) {
 535          att = &fb->Attachment[BUFFER_DEPTH];
 536          test_attachment_completeness(ctx, GL_DEPTH, att);
 537          if (!att->Complete) {
 538             fb->_Status = GL_FRAMEBUFFER_INCOMPLETE_ATTACHMENT_EXT;
 539             fbo_incomplete("depth attachment incomplete", -1);
 540             return;
 541          }
 542       }
 543       else if (i == -1) {
 544          att = &fb->Attachment[BUFFER_STENCIL];
 545          test_attachment_completeness(ctx, GL_STENCIL, att);
 546          if (!att->Complete) {
 547             fb->_Status = GL_FRAMEBUFFER_INCOMPLETE_ATTACHMENT_EXT;
 548             fbo_incomplete("stencil attachment incomplete", -1);
 549             return;
 550          }
 551       }
 552       else {
 553          att = &fb->Attachment[BUFFER_COLOR0 + i];
 554          test_attachment_completeness(ctx, GL_COLOR, att);
 555          if (!att->Complete) {
 556             fb->_Status = GL_FRAMEBUFFER_INCOMPLETE_ATTACHMENT_EXT;
 557             fbo_incomplete("color attachment incomplete", i);
 558             return;
 559          }
 560       }
 561
 562       /* get width, height, format of the renderbuffer/texture
 563        */
 564       if (att->Type == GL_TEXTURE) {
 565          const struct gl_texture_image *texImg
 566             = att->Texture->Image[att->CubeMapFace][att->TextureLevel];
 567          minWidth = MIN2(minWidth, texImg->Width);
 568          maxWidth = MAX2(maxWidth, texImg->Width);
 569          minHeight = MIN2(minHeight, texImg->Height);
 570          maxHeight = MAX2(maxHeight, texImg->Height);
 571          f = texImg->_BaseFormat;
 572          numImages++;
 573          if (f != GL_RGB && f != GL_RGBA && f != GL_DEPTH_COMPONENT
 574              && f != GL_DEPTH_STENCIL_EXT) {
 575             fb->_Status = GL_FRAMEBUFFER_INCOMPLETE_FORMATS_EXT;
 576             fbo_incomplete("texture attachment incomplete", -1);
 577             return;
 578          }
 579       }
 580       else if (att->Type == GL_RENDERBUFFER_EXT) {
 581          minWidth = MIN2(minWidth, att->Renderbuffer->Width);
 582          maxWidth = MAX2(minWidth, att->Renderbuffer->Width);
 583          minHeight = MIN2(minHeight, att->Renderbuffer->Height);
 584          maxHeight = MAX2(minHeight, att->Renderbuffer->Height);
 585          f = att->Renderbuffer->InternalFormat;
 586          numImages++;
 587       }
 588       else {
 589          assert(att->Type == GL_NONE);
 590          continue;
 591       }
 592
 593       if (numSamples < 0) {
 594          /* first buffer */
 595          numSamples = att->Renderbuffer->NumSamples;
 596       }
 597
 598       /* Error-check width, height, format, samples
 599        */
 600       if (numImages == 1) {
 601          /* save format, num samples */
 602          if (i >= 0) {
 603             intFormat = f;
 604          }
 605       }
 606       else {
 607          if (!ctx->Extensions.ARB_framebuffer_object) {
 608             /* check that width, height, format are same */
 609             if (minWidth != maxWidth || minHeight != maxHeight) {
 610                fb->_Status = GL_FRAMEBUFFER_INCOMPLETE_DIMENSIONS_EXT;
 611                fbo_incomplete("width or height mismatch", -1);
 612                return;
 613             }
 614             /* check that all color buffer have same format */
 615             if (intFormat != GL_NONE && f != intFormat) {
 616                fb->_Status = GL_FRAMEBUFFER_INCOMPLETE_FORMATS_EXT;
 617                fbo_incomplete("format mismatch", -1);
 618                return;
 619             }
 620          }
 621          if (att->Renderbuffer &&
 622              att->Renderbuffer->NumSamples != numSamples) {
 623             fb->_Status = GL_FRAMEBUFFER_INCOMPLETE_MULTISAMPLE;
 624             fbo_incomplete("inconsistant number of samples", i);
 625             return;
 626          }
 627
 628       }
 629    }
 630
 631 #ifndef FEATURE_OES_framebuffer_object
 632    /* Check that all DrawBuffers are present */
 633    for (j = 0; j < ctx->Const.MaxDrawBuffers; j++) {
 634       if (fb->ColorDrawBuffer[j] != GL_NONE) {
 635          const struct gl_renderbuffer_attachment *att
 636             = _mesa_get_attachment(ctx, fb, fb->ColorDrawBuffer[j]);
 637          assert(att);
 638          if (att->Type == GL_NONE) {
 639             fb->_Status = GL_FRAMEBUFFER_INCOMPLETE_DRAW_BUFFER_EXT;
 640             fbo_incomplete("missing drawbuffer", j);
 641             return;
 642          }
 643       }
 644    }
 645
 646    /* Check that the ReadBuffer is present */
 647    if (fb->ColorReadBuffer != GL_NONE) {
 648       const struct gl_renderbuffer_attachment *att
 649          = _mesa_get_attachment(ctx, fb, fb->ColorReadBuffer);
 650       assert(att);
 651       if (att->Type == GL_NONE) {
 652          fb->_Status = GL_FRAMEBUFFER_INCOMPLETE_READ_BUFFER_EXT;
 653             fbo_incomplete("missing readbuffer", -1);
 654          return;
 655       }
 656    }
 657 #else
 658    (void) j;
 659 #endif
 660
 661    if (numImages == 0) {
 662       fb->_Status = GL_FRAMEBUFFER_INCOMPLETE_MISSING_ATTACHMENT_EXT;
 663       fbo_incomplete("no attachments", -1);
 664       return;
 665    }
 666
 667    /* Provisionally set status = COMPLETE ... */
 668    fb->_Status = GL_FRAMEBUFFER_COMPLETE_EXT;
 669
 670    /* ... but the driver may say the FB is incomplete.
 671     * Drivers will most likely set the status to GL_FRAMEBUFFER_UNSUPPORTED
 672     * if anything.
 673     */
 674    if (ctx->Driver.ValidateFramebuffer) {
 675       ctx->Driver.ValidateFramebuffer(ctx, fb);
 676       if (fb->_Status != GL_FRAMEBUFFER_COMPLETE_EXT) {
 677          fbo_incomplete("driver marked FBO as incomplete", -1);
 678       }
 679    }
 680
 681    if (fb->_Status == GL_FRAMEBUFFER_COMPLETE_EXT) {
 682       /*
 683        * Note that if ARB_framebuffer_object is supported and the attached
 684        * renderbuffers/textures are different sizes, the framebuffer
 685        * width/height will be set to the smallest width/height.
 686        */
 687       fb->Width = minWidth;
 688       fb->Height = minHeight;
 689
 690       /* finally, update the visual info for the framebuffer */
 691       _mesa_update_framebuffer_visual(fb);
 692    }
 693 }
 694
 695
 696 GLboolean GLAPIENTRY
 697 _mesa_IsRenderbufferEXT(GLuint renderbuffer)
 698 {
 699    GET_CURRENT_CONTEXT(ctx);
 700    ASSERT_OUTSIDE_BEGIN_END_WITH_RETVAL(ctx, GL_FALSE);
 701    if (renderbuffer) {
 702       struct gl_renderbuffer *rb = _mesa_lookup_renderbuffer(ctx, renderbuffer);
 703       if (rb != NULL && rb != &DummyRenderbuffer)
 704          return GL_TRUE;
 705    }
 706    return GL_FALSE;
 707 }
 708
 709
 710 void GLAPIENTRY
 711 _mesa_BindRenderbufferEXT(GLenum target, GLuint renderbuffer)
 712 {
 713    struct gl_renderbuffer *newRb;
 714    GET_CURRENT_CONTEXT(ctx);
 715
 716    ASSERT_OUTSIDE_BEGIN_END(ctx);
 717
 718    if (target != GL_RENDERBUFFER_EXT) {
 719       _mesa_error(ctx, GL_INVALID_ENUM, "glBindRenderbufferEXT(target)");
 720       return;
 721    }
 722
 723    /* No need to flush here since the render buffer binding has no
 724     * effect on rendering state.
 725     */
 726
 727    if (renderbuffer) {
 728       newRb = _mesa_lookup_renderbuffer(ctx, renderbuffer);
 729       if (newRb == &DummyRenderbuffer) {
 730          /* ID was reserved, but no real renderbuffer object made yet */
 731          newRb = NULL;
 732       }
 733       else if (!newRb && ctx->Extensions.ARB_framebuffer_object) {
 734          /* All RB IDs must be Gen'd */
 735          _mesa_error(ctx, GL_INVALID_OPERATION, "glBindRenderbuffer(buffer)");
 736          return;
 737       }
 738
 739       if (!newRb) {
 740          /* create new renderbuffer object */
 741          newRb = ctx->Driver.NewRenderbuffer(ctx, renderbuffer);
 742          if (!newRb) {
 743             _mesa_error(ctx, GL_OUT_OF_MEMORY, "glBindRenderbufferEXT");
 744             return;
 745          }
 746          ASSERT(newRb->AllocStorage);
 747          _mesa_HashInsert(ctx->Shared->RenderBuffers, renderbuffer, newRb);
 748          newRb->RefCount = 1; /* referenced by hash table */
 749       }
 750    }
 751    else {
 752       newRb = NULL;
 753    }
 754
 755    ASSERT(newRb != &DummyRenderbuffer);
 756
 757    _mesa_reference_renderbuffer(&ctx->CurrentRenderbuffer, newRb);
 758 }
 759
 760
 761 /**
 762  * If the given renderbuffer is anywhere attached to the framebuffer, detach
 763  * the renderbuffer.
 764  * This is used when a renderbuffer object is deleted.
 765  * The spec calls for unbinding.
 766  */
 767 static void
 768 detach_renderbuffer(GLcontext *ctx,
 769                     struct gl_framebuffer *fb,
 770                     struct gl_renderbuffer *rb)
 771 {
 772    GLuint i;
 773    for (i = 0; i < BUFFER_COUNT; i++) {
 774       if (fb->Attachment[i].Renderbuffer == rb) {
 775          _mesa_remove_attachment(ctx, &fb->Attachment[i]);
 776       }
 777    }
 778    invalidate_framebuffer(fb);
 779 }
 780
 781
 782 void GLAPIENTRY
 783 _mesa_DeleteRenderbuffersEXT(GLsizei n, const GLuint *renderbuffers)
 784 {
 785    GLint i;
 786    GET_CURRENT_CONTEXT(ctx);
 787
 788    ASSERT_OUTSIDE_BEGIN_END(ctx);
 789    FLUSH_VERTICES(ctx, _NEW_BUFFERS);
 790
 791    for (i = 0; i < n; i++) {
 792       if (renderbuffers[i] > 0) {
 793          struct gl_renderbuffer *rb;
 794          rb = _mesa_lookup_renderbuffer(ctx, renderbuffers[i]);
 795          if (rb) {
 796             /* check if deleting currently bound renderbuffer object */
 797             if (rb == ctx->CurrentRenderbuffer) {
 798                /* bind default */
 799                ASSERT(rb->RefCount >= 2);
 800                _mesa_BindRenderbufferEXT(GL_RENDERBUFFER_EXT, 0);
 801             }
 802
 803             if (ctx->DrawBuffer->Name) {
 804                detach_renderbuffer(ctx, ctx->DrawBuffer, rb);
 805             }
 806             if (ctx->ReadBuffer->Name && ctx->ReadBuffer != ctx->DrawBuffer) {
 807                detach_renderbuffer(ctx, ctx->ReadBuffer, rb);
 808             }
 809
 810             /* Remove from hash table immediately, to free the ID.
 811              * But the object will not be freed until it's no longer
 812              * referenced anywhere else.
 813              */
 814             _mesa_HashRemove(ctx->Shared->RenderBuffers, renderbuffers[i]);
 815
 816             if (rb != &DummyRenderbuffer) {
 817                /* no longer referenced by hash table */
 818                _mesa_reference_renderbuffer(&rb, NULL);
 819             }
 820          }
 821       }
 822    }
 823 }
 824
 825
 826 void GLAPIENTRY
 827 _mesa_GenRenderbuffersEXT(GLsizei n, GLuint *renderbuffers)
 828 {
 829    GET_CURRENT_CONTEXT(ctx);
 830    GLuint first;
 831    GLint i;
 832
 833    ASSERT_OUTSIDE_BEGIN_END(ctx);
 834
 835    if (n < 0) {
 836       _mesa_error(ctx, GL_INVALID_VALUE, "glGenRenderbuffersEXT(n)");
 837       return;
 838    }
 839
 840    if (!renderbuffers)
 841       return;
 842
 843    first = _mesa_HashFindFreeKeyBlock(ctx->Shared->RenderBuffers, n);
 844
 845    for (i = 0; i < n; i++) {
 846       GLuint name = first + i;
 847       renderbuffers[i] = name;
 848       /* insert dummy placeholder into hash table */
 849       _glthread_LOCK_MUTEX(ctx->Shared->Mutex);
 850       _mesa_HashInsert(ctx->Shared->RenderBuffers, name, &DummyRenderbuffer);
 851       _glthread_UNLOCK_MUTEX(ctx->Shared->Mutex);
 852    }
 853 }
 854
 855
 856 /**
 857  * Given an internal format token for a render buffer, return the
 858  * corresponding base format.
 859  * This is very similar to _mesa_base_tex_format() but the set of valid
 860  * internal formats is somewhat different.
 861  *
 862  * \return one of GL_RGB, GL_RGBA, GL_STENCIL_INDEX, GL_DEPTH_COMPONENT
 863  *  GL_DEPTH_STENCIL_EXT or zero if error.
 864  */
 865 GLenum
 866 _mesa_base_fbo_format(GLcontext *ctx, GLenum internalFormat)
 867 {
 868    switch (internalFormat) {
 869    case GL_RGB:
 870    case GL_R3_G3_B2:
 871    case GL_RGB4:
 872    case GL_RGB5:
 873    case GL_RGB8:
 874    case GL_RGB10:
 875    case GL_RGB12:
 876    case GL_RGB16:
 877       return GL_RGB;
 878    case GL_RGBA:
 879    case GL_RGBA2:
 880    case GL_RGBA4:
 881    case GL_RGB5_A1:
 882    case GL_RGBA8:
 883    case GL_RGB10_A2:
 884    case GL_RGBA12:
 885    case GL_RGBA16:
 886       return GL_RGBA;
 887    case GL_STENCIL_INDEX:
 888    case GL_STENCIL_INDEX1_EXT:
 889    case GL_STENCIL_INDEX4_EXT:
 890    case GL_STENCIL_INDEX8_EXT:
 891    case GL_STENCIL_INDEX16_EXT:
 892       return GL_STENCIL_INDEX;
 893    case GL_DEPTH_COMPONENT:
 894    case GL_DEPTH_COMPONENT16:
 895    case GL_DEPTH_COMPONENT24:
 896    case GL_DEPTH_COMPONENT32:
 897       return GL_DEPTH_COMPONENT;
 898    case GL_DEPTH_STENCIL_EXT:
 899    case GL_DEPTH24_STENCIL8_EXT:
 900       if (ctx->Extensions.EXT_packed_depth_stencil)
 901          return GL_DEPTH_STENCIL_EXT;
 902       else
 903          return 0;
 904    /* XXX add floating point formats eventually */
 905    default:
 906       return 0;
 907    }
 908 }
 909
 910
 911 /** sentinal value, see below */
 912 #define NO_SAMPLES 1000
 913
 914
 915 /**
 916  * Helper function used by _mesa_RenderbufferStorageEXT() and
 917  * _mesa_RenderbufferStorageMultisample().
 918  * samples will be NO_SAMPLES if called by _mesa_RenderbufferStorageEXT().
 919  */
 920 static void
 921 renderbuffer_storage(GLenum target, GLenum internalFormat,
 922                      GLsizei width, GLsizei height, GLsizei samples)
 923 {
 924    const char *func = samples == NO_SAMPLES ?
 925       "glRenderbufferStorage" : "RenderbufferStorageMultisample";
 926    struct gl_renderbuffer *rb;
 927    GLenum baseFormat;
 928    GET_CURRENT_CONTEXT(ctx);
 929
 930    ASSERT_OUTSIDE_BEGIN_END(ctx);
 931
 932    if (target != GL_RENDERBUFFER_EXT) {
 933       _mesa_error(ctx, GL_INVALID_ENUM, "%s(target)", func);
 934       return;
 935    }
 936
 937    baseFormat = _mesa_base_fbo_format(ctx, internalFormat);
 938    if (baseFormat == 0) {
 939       _mesa_error(ctx, GL_INVALID_ENUM, "%s(internalFormat)", func);
 940       return;
 941    }
 942
 943    if (width < 1 || width > (GLsizei) ctx->Const.MaxRenderbufferSize) {
 944       _mesa_error(ctx, GL_INVALID_VALUE, "%s(width)", func);
 945       return;
 946    }
 947
 948    if (height < 1 || height > (GLsizei) ctx->Const.MaxRenderbufferSize) {
 949       _mesa_error(ctx, GL_INVALID_VALUE, "%s(height)", func);
 950       return;
 951    }
 952
 953    if (samples == NO_SAMPLES) {
 954       /* NumSamples == 0 indicates non-multisampling */
 955       samples = 0;
 956    }
 957    else if (samples > ctx->Const.MaxSamples) {
 958       /* note: driver may choose to use more samples than what's requested */
 959       _mesa_error(ctx, GL_INVALID_VALUE, "%s(samples)", func);
 960       return;
 961    }
 962
 963    rb = ctx->CurrentRenderbuffer;
 964    if (!rb) {
 965       _mesa_error(ctx, GL_INVALID_OPERATION, func);
 966       return;
 967    }
 968
 969    FLUSH_VERTICES(ctx, _NEW_BUFFERS);
 970
 971    if (rb->InternalFormat == internalFormat &&
 972        rb->Width == (GLuint) width &&
 973        rb->Height == (GLuint) height) {
 974       /* no change in allocation needed */
 975       return;
 976    }
 977
 978    /* These MUST get set by the AllocStorage func */
 979    rb->Format = MESA_FORMAT_NONE;
 980    rb->NumSamples = samples;
 981
 982    /* Now allocate the storage */
 983    ASSERT(rb->AllocStorage);
 984    if (rb->AllocStorage(ctx, rb, internalFormat, width, height)) {
 985       /* No error - check/set fields now */
 986       assert(rb->Format != MESA_FORMAT_NONE);
 987       assert(rb->Width == (GLuint) width);
 988       assert(rb->Height == (GLuint) height);
 989       rb->InternalFormat = internalFormat;
 990       rb->_BaseFormat = _mesa_base_fbo_format(ctx, internalFormat);
 991       assert(rb->_BaseFormat != 0);
 992    }
 993    else {
 994       /* Probably ran out of memory - clear the fields */
 995       rb->Width = 0;
 996       rb->Height = 0;
 997       rb->Format = MESA_FORMAT_NONE;
 998       rb->InternalFormat = GL_NONE;
 999       rb->_BaseFormat = GL_NONE;
1000       rb->NumSamples = 0;
1001    }
1002
1003    /*
1004    test_framebuffer_completeness(ctx, fb);
1005    */
1006    /* XXX if this renderbuffer is attached anywhere, invalidate attachment
1007     * points???
1008     */
1009 }
1010
1011
1012 /**
1013  * Helper function for _mesa_GetRenderbufferParameterivEXT() and
1014  * _mesa_GetFramebufferAttachmentParameterivEXT()
1015  * We have to be careful to respect the base format.  For example, if a
1016  * renderbuffer/texture was created with internalFormat=GL_RGB but the
1017  * driver actually chose a GL_RGBA format, when the user queries ALPHA_SIZE
1018  * we need to return zero.
1019  */
1020 static GLint
1021 get_component_bits(GLenum pname, GLenum baseFormat, gl_format format)
1022 {
1023    switch (pname) {
1024    case GL_RENDERBUFFER_RED_SIZE_EXT:
1025    case GL_FRAMEBUFFER_ATTACHMENT_RED_SIZE:
1026    case GL_RENDERBUFFER_GREEN_SIZE_EXT:
1027    case GL_FRAMEBUFFER_ATTACHMENT_GREEN_SIZE:
1028    case GL_RENDERBUFFER_BLUE_SIZE_EXT:
1029    case GL_FRAMEBUFFER_ATTACHMENT_BLUE_SIZE:
1030       if (baseFormat == GL_RGB || baseFormat == GL_RGBA)
1031          return _mesa_get_format_bits(format, pname);
1032       else
1033          return 0;
1034    case GL_RENDERBUFFER_ALPHA_SIZE_EXT:
1035    case GL_FRAMEBUFFER_ATTACHMENT_ALPHA_SIZE:
1036       if (baseFormat == GL_RGBA || baseFormat == GL_ALPHA)
1037          return _mesa_get_format_bits(format, pname);
1038       else
1039          return 0;
1040    case GL_RENDERBUFFER_DEPTH_SIZE_EXT:
1041    case GL_FRAMEBUFFER_ATTACHMENT_DEPTH_SIZE:
1042       if (baseFormat == GL_DEPTH_COMPONENT || baseFormat == GL_DEPTH_STENCIL)
1043          return _mesa_get_format_bits(format, pname);
1044       else
1045          return 0;
1046    case GL_RENDERBUFFER_STENCIL_SIZE_EXT:
1047    case GL_FRAMEBUFFER_ATTACHMENT_STENCIL_SIZE:
1048       if (baseFormat == GL_STENCIL_INDEX || baseFormat == GL_DEPTH_STENCIL)
1049          return _mesa_get_format_bits(format, pname);
1050       else
1051          return 0;
1052    default:
1053       return 0;
1054    }
1055 }
1056
1057
1058
1059 void GLAPIENTRY
1060 _mesa_RenderbufferStorageEXT(GLenum target, GLenum internalFormat,
1061                              GLsizei width, GLsizei height)
1062 {
1063    /* GL_ARB_fbo says calling this function is equivalent to calling
1064     * glRenderbufferStorageMultisample() with samples=0.  We pass in
1065     * a token value here just for error reporting purposes.
1066     */
1067    renderbuffer_storage(target, internalFormat, width, height, NO_SAMPLES);
1068 }
1069
1070
1071 void GLAPIENTRY
1072 _mesa_RenderbufferStorageMultisample(GLenum target, GLsizei samples,
1073                                      GLenum internalFormat,
1074                                      GLsizei width, GLsizei height)
1075 {
1076    renderbuffer_storage(target, internalFormat, width, height, samples);
1077 }
1078
1079
1080
1081 void GLAPIENTRY
1082 _mesa_GetRenderbufferParameterivEXT(GLenum target, GLenum pname, GLint *params)
1083 {
1084    struct gl_renderbuffer *rb;
1085    GET_CURRENT_CONTEXT(ctx);
1086
1087    ASSERT_OUTSIDE_BEGIN_END(ctx);
1088
1089    if (target != GL_RENDERBUFFER_EXT) {
1090       _mesa_error(ctx, GL_INVALID_ENUM,
1091                   "glGetRenderbufferParameterivEXT(target)");
1092       return;
1093    }
1094
1095    rb = ctx->CurrentRenderbuffer;
1096    if (!rb) {
1097       _mesa_error(ctx, GL_INVALID_OPERATION,
1098                   "glGetRenderbufferParameterivEXT");
1099       return;
1100    }
1101
1102    /* No need to flush here since we're just quering state which is
1103     * not effected by rendering.
1104     */
1105
1106    switch (pname) {
1107    case GL_RENDERBUFFER_WIDTH_EXT:
1108       *params = rb->Width;
1109       return;
1110    case GL_RENDERBUFFER_HEIGHT_EXT:
1111       *params = rb->Height;
1112       return;
1113    case GL_RENDERBUFFER_INTERNAL_FORMAT_EXT:
1114       *params = rb->InternalFormat;
1115       return;
1116    case GL_RENDERBUFFER_RED_SIZE_EXT:
1117    case GL_RENDERBUFFER_GREEN_SIZE_EXT:
1118    case GL_RENDERBUFFER_BLUE_SIZE_EXT:
1119    case GL_RENDERBUFFER_ALPHA_SIZE_EXT:
1120    case GL_RENDERBUFFER_DEPTH_SIZE_EXT:
1121    case GL_RENDERBUFFER_STENCIL_SIZE_EXT:
1122       *params = get_component_bits(pname, rb->_BaseFormat, rb->Format);
1123       break;
1124    case GL_RENDERBUFFER_SAMPLES:
1125       if (ctx->Extensions.ARB_framebuffer_object) {
1126          *params = rb->NumSamples;
1127          break;
1128       }
1129       /* fallthrough */
1130    default:
1131       _mesa_error(ctx, GL_INVALID_ENUM,
1132                   "glGetRenderbufferParameterivEXT(target)");
1133       return;
1134    }
1135 }
1136
1137
1138 GLboolean GLAPIENTRY
1139 _mesa_IsFramebufferEXT(GLuint framebuffer)
1140 {
1141    GET_CURRENT_CONTEXT(ctx);
1142    ASSERT_OUTSIDE_BEGIN_END_WITH_RETVAL(ctx, GL_FALSE);
1143    if (framebuffer) {
1144       struct gl_framebuffer *rb = _mesa_lookup_framebuffer(ctx, framebuffer);
1145       if (rb != NULL && rb != &DummyFramebuffer)
1146          return GL_TRUE;
1147    }
1148    return GL_FALSE;
1149 }
1150
1151
1152 /**
1153  * Check if any of the attachments of the given framebuffer are textures
1154  * (render to texture).  Call ctx->Driver.RenderTexture() for such
1155  * attachments.
1156  */
1157 static void
1158 check_begin_texture_render(GLcontext *ctx, struct gl_framebuffer *fb)
1159 {
1160    GLuint i;
1161    ASSERT(ctx->Driver.RenderTexture);
1162    for (i = 0; i < BUFFER_COUNT; i++) {
1163       struct gl_renderbuffer_attachment *att = fb->Attachment + i;
1164       struct gl_texture_object *texObj = att->Texture;
1165       if (texObj
1166           && texObj->Image[att->CubeMapFace][att->TextureLevel]) {
1167          ctx->Driver.RenderTexture(ctx, fb, att);
1168       }
1169    }
1170 }
1171
1172
1173 /**
1174  * Examine all the framebuffer's attachments to see if any are textures.
1175  * If so, call ctx->Driver.FinishRenderTexture() for each texture to
1176  * notify the device driver that the texture image may have changed.
1177  */
1178 static void
1179 check_end_texture_render(GLcontext *ctx, struct gl_framebuffer *fb)
1180 {
1181    if (ctx->Driver.FinishRenderTexture) {
1182       GLuint i;
1183       for (i = 0; i < BUFFER_COUNT; i++) {
1184          struct gl_renderbuffer_attachment *att = fb->Attachment + i;
1185          if (att->Texture && att->Renderbuffer) {
1186             ctx->Driver.FinishRenderTexture(ctx, att);
1187          }
1188       }
1189    }
1190 }
1191
1192
1193 void GLAPIENTRY
1194 _mesa_BindFramebufferEXT(GLenum target, GLuint framebuffer)
1195 {
1196    struct gl_framebuffer *newDrawFb, *newReadFb;
1197    struct gl_framebuffer *oldDrawFb, *oldReadFb;
1198    GLboolean bindReadBuf, bindDrawBuf;
1199    GET_CURRENT_CONTEXT(ctx);
1200
1201 #ifdef DEBUG
1202    if (ctx->Extensions.ARB_framebuffer_object) {
1203       ASSERT(ctx->Extensions.EXT_framebuffer_object);
1204       ASSERT(ctx->Extensions.EXT_framebuffer_blit);
1205    }
1206 #endif
1207
1208    ASSERT_OUTSIDE_BEGIN_END(ctx);
1209
1210    if (!ctx->Extensions.EXT_framebuffer_object) {
1211       _mesa_error(ctx, GL_INVALID_OPERATION,
1212                   "glBindFramebufferEXT(unsupported)");
1213       return;
1214    }
1215
1216    switch (target) {
1217 #if FEATURE_EXT_framebuffer_blit
1218    case GL_DRAW_FRAMEBUFFER_EXT:
1219       if (!ctx->Extensions.EXT_framebuffer_blit) {
1220          _mesa_error(ctx, GL_INVALID_ENUM, "glBindFramebufferEXT(target)");
1221          return;
1222       }
1223       bindDrawBuf = GL_TRUE;
1224       bindReadBuf = GL_FALSE;
1225       break;
1226    case GL_READ_FRAMEBUFFER_EXT:
1227       if (!ctx->Extensions.EXT_framebuffer_blit) {
1228          _mesa_error(ctx, GL_INVALID_ENUM, "glBindFramebufferEXT(target)");
1229          return;
1230       }
1231       bindDrawBuf = GL_FALSE;
1232       bindReadBuf = GL_TRUE;
1233       break;
1234 #endif
1235    case GL_FRAMEBUFFER_EXT:
1236       bindDrawBuf = GL_TRUE;
1237       bindReadBuf = GL_TRUE;
1238       break;
1239    default:
1240       _mesa_error(ctx, GL_INVALID_ENUM, "glBindFramebufferEXT(target)");
1241       return;
1242    }
1243
1244    if (framebuffer) {
1245       /* Binding a user-created framebuffer object */
1246       newDrawFb = _mesa_lookup_framebuffer(ctx, framebuffer);
1247       if (newDrawFb == &DummyFramebuffer) {
1248          /* ID was reserved, but no real framebuffer object made yet */
1249          newDrawFb = NULL;
1250       }
1251       else if (!newDrawFb && ctx->Extensions.ARB_framebuffer_object) {
1252          /* All FBO IDs must be Gen'd */
1253          _mesa_error(ctx, GL_INVALID_OPERATION, "glBindFramebuffer(buffer)");
1254          return;
1255       }
1256
1257       if (!newDrawFb) {
1258          /* create new framebuffer object */
1259          newDrawFb = ctx->Driver.NewFramebuffer(ctx, framebuffer);
1260          if (!newDrawFb) {
1261             _mesa_error(ctx, GL_OUT_OF_MEMORY, "glBindFramebufferEXT");
1262             return;
1263          }
1264          _mesa_HashInsert(ctx->Shared->FrameBuffers, framebuffer, newDrawFb);
1265       }
1266       newReadFb = newDrawFb;
1267    }
1268    else {
1269       /* Binding the window system framebuffer (which was originally set
1270        * with MakeCurrent).
1271        */
1272       newDrawFb = ctx->WinSysDrawBuffer;
1273       newReadFb = ctx->WinSysReadBuffer;
1274    }
1275
1276    ASSERT(newDrawFb);
1277    ASSERT(newDrawFb != &DummyFramebuffer);
1278
1279    oldDrawFb = ctx->DrawBuffer;
1280    oldReadFb = ctx->ReadBuffer;
1281
1282    /*
1283     * OK, now bind the new Draw/Read framebuffers, if they're changing.
1284     */
1285    if (bindReadBuf) {
1286       if (oldReadFb == newReadFb) {
1287          bindReadBuf = GL_FALSE; /* no change */
1288       }
1289       else {
1290          FLUSH_VERTICES(ctx, _NEW_BUFFERS);
1291
1292          _mesa_reference_framebuffer(&ctx->ReadBuffer, newReadFb);
1293       }
1294    }
1295
1296    if (bindDrawBuf) {
1297       if (oldDrawFb == newDrawFb) {
1298          bindDrawBuf = GL_FALSE; /* no change */
1299       }
1300       else {
1301          FLUSH_VERTICES(ctx, _NEW_BUFFERS);
1302
1303          if (oldDrawFb->Name != 0) {
1304             check_end_texture_render(ctx, oldDrawFb);
1305          }
1306
1307          if (newDrawFb->Name != 0) {
1308             /* check if newly bound framebuffer has any texture attachments */
1309             check_begin_texture_render(ctx, newDrawFb);
1310          }
1311
1312          _mesa_reference_framebuffer(&ctx->DrawBuffer, newDrawFb);
1313       }
1314    }
1315
1316    if ((bindDrawBuf || bindReadBuf) && ctx->Driver.BindFramebuffer) {
1317       ctx->Driver.BindFramebuffer(ctx, target, newDrawFb, newReadFb);
1318    }
1319 }
1320
1321
1322 void GLAPIENTRY
1323 _mesa_DeleteFramebuffersEXT(GLsizei n, const GLuint *framebuffers)
1324 {
1325    GLint i;
1326    GET_CURRENT_CONTEXT(ctx);
1327
1328    ASSERT_OUTSIDE_BEGIN_END(ctx);
1329    FLUSH_VERTICES(ctx, _NEW_BUFFERS);
1330
1331    for (i = 0; i < n; i++) {
1332       if (framebuffers[i] > 0) {
1333          struct gl_framebuffer *fb;
1334          fb = _mesa_lookup_framebuffer(ctx, framebuffers[i]);
1335          if (fb) {
1336             ASSERT(fb == &DummyFramebuffer || fb->Name == framebuffers[i]);
1337
1338             /* check if deleting currently bound framebuffer object */
1339             if (fb == ctx->DrawBuffer) {
1340                /* bind default */
1341                ASSERT(fb->RefCount >= 2);
1342                _mesa_BindFramebufferEXT(GL_DRAW_FRAMEBUFFER_EXT, 0);
1343             }
1344             if (fb == ctx->ReadBuffer) {
1345                /* bind default */
1346                ASSERT(fb->RefCount >= 2);
1347                _mesa_BindFramebufferEXT(GL_READ_FRAMEBUFFER_EXT, 0);
1348             }
1349
1350             /* remove from hash table immediately, to free the ID */
1351             _mesa_HashRemove(ctx->Shared->FrameBuffers, framebuffers[i]);
1352
1353             if (fb != &DummyFramebuffer) {
1354                /* But the object will not be freed until it's no longer
1355                 * bound in any context.
1356                 */
1357                _mesa_reference_framebuffer(&fb, NULL);
1358             }
1359          }
1360       }
1361    }
1362 }
1363
1364
1365 void GLAPIENTRY
1366 _mesa_GenFramebuffersEXT(GLsizei n, GLuint *framebuffers)
1367 {
1368    GET_CURRENT_CONTEXT(ctx);
1369    GLuint first;
1370    GLint i;
1371
1372    ASSERT_OUTSIDE_BEGIN_END(ctx);
1373
1374    if (n < 0) {
1375       _mesa_error(ctx, GL_INVALID_VALUE, "glGenFramebuffersEXT(n)");
1376       return;
1377    }
1378
1379    if (!framebuffers)
1380       return;
1381
1382    first = _mesa_HashFindFreeKeyBlock(ctx->Shared->FrameBuffers, n);
1383
1384    for (i = 0; i < n; i++) {
1385       GLuint name = first + i;
1386       framebuffers[i] = name;
1387       /* insert dummy placeholder into hash table */
1388       _glthread_LOCK_MUTEX(ctx->Shared->Mutex);
1389       _mesa_HashInsert(ctx->Shared->FrameBuffers, name, &DummyFramebuffer);
1390       _glthread_UNLOCK_MUTEX(ctx->Shared->Mutex);
1391    }
1392 }
1393
1394
1395
1396 GLenum GLAPIENTRY
1397 _mesa_CheckFramebufferStatusEXT(GLenum target)
1398 {
1399    struct gl_framebuffer *buffer;
1400    GET_CURRENT_CONTEXT(ctx);
1401
1402    ASSERT_OUTSIDE_BEGIN_END_WITH_RETVAL(ctx, 0);
1403
1404    switch (target) {
1405 #if FEATURE_EXT_framebuffer_blit
1406    case GL_DRAW_FRAMEBUFFER_EXT:
1407       if (!ctx->Extensions.EXT_framebuffer_blit) {
1408          _mesa_error(ctx, GL_INVALID_ENUM, "glCheckFramebufferStatus(target)");
1409          return 0;
1410       }
1411       buffer = ctx->DrawBuffer;
1412       break;
1413    case GL_READ_FRAMEBUFFER_EXT:
1414       if (!ctx->Extensions.EXT_framebuffer_blit) {
1415          _mesa_error(ctx, GL_INVALID_ENUM, "glCheckFramebufferStatus(target)");
1416          return 0;
1417       }
1418       buffer = ctx->ReadBuffer;
1419       break;
1420 #endif
1421    case GL_FRAMEBUFFER_EXT:
1422       buffer = ctx->DrawBuffer;
1423       break;
1424    default:
1425       _mesa_error(ctx, GL_INVALID_ENUM, "glCheckFramebufferStatus(target)");
1426       return 0; /* formerly GL_FRAMEBUFFER_STATUS_ERROR_EXT */
1427    }
1428
1429    if (buffer->Name == 0) {
1430       /* The window system / default framebuffer is always complete */
1431       return GL_FRAMEBUFFER_COMPLETE_EXT;
1432    }
1433
1434    /* No need to flush here */
1435
1436    if (buffer->_Status != GL_FRAMEBUFFER_COMPLETE) {
1437       _mesa_test_framebuffer_completeness(ctx, buffer);
1438    }
1439
1440    return buffer->_Status;
1441 }
1442
1443
1444
1445 /**
1446  * Common code called by glFramebufferTexture1D/2D/3DEXT().
1447  */
1448 static void
1449 framebuffer_texture(GLcontext *ctx, const char *caller, GLenum target,
1450                     GLenum attachment, GLenum textarget, GLuint texture,
1451                     GLint level, GLint zoffset)
1452 {
1453    struct gl_renderbuffer_attachment *att;
1454    struct gl_texture_object *texObj = NULL;
1455    struct gl_framebuffer *fb;
1456    GLboolean error = GL_FALSE;
1457
1458    ASSERT_OUTSIDE_BEGIN_END(ctx);
1459
1460    switch (target) {
1461    case GL_READ_FRAMEBUFFER_EXT:
1462       error = !ctx->Extensions.EXT_framebuffer_blit;
1463       fb = ctx->ReadBuffer;
1464       break;
1465    case GL_DRAW_FRAMEBUFFER_EXT:
1466       error = !ctx->Extensions.EXT_framebuffer_blit;
1467       /* fall-through */
1468    case GL_FRAMEBUFFER_EXT:
1469       fb = ctx->DrawBuffer;
1470       break;
1471    default:
1472       error = GL_TRUE;
1473    }
1474
1475    if (error) {
1476       _mesa_error(ctx, GL_INVALID_ENUM,
1477                   "glFramebufferTexture%sEXT(target=0x%x)", caller, target);
1478       return;
1479    }
1480
1481    ASSERT(fb);
1482
1483    /* check framebuffer binding */
1484    if (fb->Name == 0) {
1485       _mesa_error(ctx, GL_INVALID_OPERATION,
1486                   "glFramebufferTexture%sEXT", caller);
1487       return;
1488    }
1489
1490
1491    /* The textarget, level, and zoffset parameters are only validated if
1492     * texture is non-zero.
1493     */
1494    if (texture) {
1495       GLboolean err = GL_TRUE;
1496
1497       texObj = _mesa_lookup_texture(ctx, texture);
1498       if (texObj != NULL) {
1499          if (textarget == 0) {
1500             err = (texObj->Target != GL_TEXTURE_3D) &&
1501                 (texObj->Target != GL_TEXTURE_1D_ARRAY_EXT) &&
1502                 (texObj->Target != GL_TEXTURE_2D_ARRAY_EXT);
1503          }
1504          else {
1505             err = (texObj->Target == GL_TEXTURE_CUBE_MAP)
1506                 ? !IS_CUBE_FACE(textarget)
1507                 : (texObj->Target != textarget);
1508          }
1509       }
1510
1511       if (err) {
1512          _mesa_error(ctx, GL_INVALID_OPERATION,
1513                      "glFramebufferTexture%sEXT(texture target mismatch)",
1514                      caller);
1515          return;
1516       }
1517
1518       if (texObj->Target == GL_TEXTURE_3D) {
1519          const GLint maxSize = 1 << (ctx->Const.Max3DTextureLevels - 1);
1520          if (zoffset < 0 || zoffset >= maxSize) {
1521             _mesa_error(ctx, GL_INVALID_VALUE,
1522                         "glFramebufferTexture%sEXT(zoffset)", caller);
1523             return;
1524          }
1525       }
1526       else if ((texObj->Target == GL_TEXTURE_1D_ARRAY_EXT) ||
1527                (texObj->Target == GL_TEXTURE_2D_ARRAY_EXT)) {
1528          if (zoffset < 0 || zoffset >= ctx->Const.MaxArrayTextureLayers) {
1529             _mesa_error(ctx, GL_INVALID_VALUE,
1530                         "glFramebufferTexture%sEXT(layer)", caller);
1531             return;
1532          }
1533       }
1534
1535       if ((level < 0) ||
1536           (level >= _mesa_max_texture_levels(ctx, texObj->Target))) {
1537          _mesa_error(ctx, GL_INVALID_VALUE,
1538                      "glFramebufferTexture%sEXT(level)", caller);
1539          return;
1540       }
1541    }
1542
1543    att = _mesa_get_attachment(ctx, fb, attachment);
1544    if (att == NULL) {
1545       _mesa_error(ctx, GL_INVALID_ENUM,
1546                   "glFramebufferTexture%sEXT(attachment)", caller);
1547       return;
1548    }
1549
1550    FLUSH_VERTICES(ctx, _NEW_BUFFERS);
1551
1552    _glthread_LOCK_MUTEX(fb->Mutex);
1553    if (texObj) {
1554       _mesa_set_texture_attachment(ctx, fb, att, texObj, textarget,
1555                                    level, zoffset);
1556       /* Set the render-to-texture flag.  We'll check this flag in
1557        * glTexImage() and friends to determine if we need to revalidate
1558        * any FBOs that might be rendering into this texture.
1559        * This flag never gets cleared since it's non-trivial to determine
1560        * when all FBOs might be done rendering to this texture.  That's OK
1561        * though since it's uncommon to render to a texture then repeatedly
1562        * call glTexImage() to change images in the texture.
1563        */
1564       texObj->_RenderToTexture = GL_TRUE;
1565    }
1566    else {
1567       _mesa_remove_attachment(ctx, att);
1568    }
1569
1570    invalidate_framebuffer(fb);
1571
1572    _glthread_UNLOCK_MUTEX(fb->Mutex);
1573 }
1574
1575
1576
1577 void GLAPIENTRY
1578 _mesa_FramebufferTexture1DEXT(GLenum target, GLenum attachment,
1579                               GLenum textarget, GLuint texture, GLint level)
1580 {
1581    GET_CURRENT_CONTEXT(ctx);
1582
1583    if ((texture != 0) && (textarget != GL_TEXTURE_1D)) {
1584       _mesa_error(ctx, GL_INVALID_ENUM,
1585                   "glFramebufferTexture1DEXT(textarget)");
1586       return;
1587    }
1588
1589    framebuffer_texture(ctx, "1D", target, attachment, textarget, texture,
1590                        level, 0);
1591 }
1592
1593
1594 void GLAPIENTRY
1595 _mesa_FramebufferTexture2DEXT(GLenum target, GLenum attachment,
1596                               GLenum textarget, GLuint texture, GLint level)
1597 {
1598    GET_CURRENT_CONTEXT(ctx);
1599
1600    if ((texture != 0) &&
1601        (textarget != GL_TEXTURE_2D) &&
1602        (textarget != GL_TEXTURE_RECTANGLE_ARB) &&
1603        (!IS_CUBE_FACE(textarget))) {
1604       _mesa_error(ctx, GL_INVALID_OPERATION,
1605                   "glFramebufferTexture2DEXT(textarget=0x%x)", textarget);
1606       return;
1607    }
1608
1609    framebuffer_texture(ctx, "2D", target, attachment, textarget, texture,
1610                        level, 0);
1611 }
1612
1613
1614 void GLAPIENTRY
1615 _mesa_FramebufferTexture3DEXT(GLenum target, GLenum attachment,
1616                               GLenum textarget, GLuint texture,
1617                               GLint level, GLint zoffset)
1618 {
1619    GET_CURRENT_CONTEXT(ctx);
1620
1621    if ((texture != 0) && (textarget != GL_TEXTURE_3D)) {
1622       _mesa_error(ctx, GL_INVALID_ENUM,
1623                   "glFramebufferTexture3DEXT(textarget)");
1624       return;
1625    }
1626
1627    framebuffer_texture(ctx, "3D", target, attachment, textarget, texture,
1628                        level, zoffset);
1629 }
1630
1631
1632 void GLAPIENTRY
1633 _mesa_FramebufferTextureLayerEXT(GLenum target, GLenum attachment,
1634                                  GLuint texture, GLint level, GLint layer)
1635 {
1636    GET_CURRENT_CONTEXT(ctx);
1637
1638    framebuffer_texture(ctx, "Layer", target, attachment, 0, texture,
1639                        level, layer);
1640 }
1641
1642
1643 void GLAPIENTRY
1644 _mesa_FramebufferRenderbufferEXT(GLenum target, GLenum attachment,
1645                                  GLenum renderbufferTarget,
1646                                  GLuint renderbuffer)
1647 {
1648    struct gl_renderbuffer_attachment *att;
1649    struct gl_framebuffer *fb;
1650    struct gl_renderbuffer *rb;
1651    GET_CURRENT_CONTEXT(ctx);
1652
1653    ASSERT_OUTSIDE_BEGIN_END(ctx);
1654
1655    switch (target) {
1656 #if FEATURE_EXT_framebuffer_blit
1657    case GL_DRAW_FRAMEBUFFER_EXT:
1658       if (!ctx->Extensions.EXT_framebuffer_blit) {
1659          _mesa_error(ctx, GL_INVALID_ENUM,
1660                      "glFramebufferRenderbufferEXT(target)");
1661          return;
1662       }
1663       fb = ctx->DrawBuffer;
1664       break;
1665    case GL_READ_FRAMEBUFFER_EXT:
1666       if (!ctx->Extensions.EXT_framebuffer_blit) {
1667          _mesa_error(ctx, GL_INVALID_ENUM,
1668                      "glFramebufferRenderbufferEXT(target)");
1669          return;
1670       }
1671       fb = ctx->ReadBuffer;
1672       break;
1673 #endif
1674    case GL_FRAMEBUFFER_EXT:
1675       fb = ctx->DrawBuffer;
1676       break;
1677    default:
1678       _mesa_error(ctx, GL_INVALID_ENUM,
1679                   "glFramebufferRenderbufferEXT(target)");
1680       return;
1681    }
1682
1683    if (renderbufferTarget != GL_RENDERBUFFER_EXT) {
1684       _mesa_error(ctx, GL_INVALID_ENUM,
1685                   "glFramebufferRenderbufferEXT(renderbufferTarget)");
1686       return;
1687    }
1688
1689    if (fb->Name == 0) {
1690       /* Can't attach new renderbuffers to a window system framebuffer */
1691       _mesa_error(ctx, GL_INVALID_OPERATION, "glFramebufferRenderbufferEXT");
1692       return;
1693    }
1694
1695    att = _mesa_get_attachment(ctx, fb, attachment);
1696    if (att == NULL) {
1697       _mesa_error(ctx, GL_INVALID_ENUM,
1698                   "glFramebufferRenderbufferEXT(invalid attachment %s)",
1699                   _mesa_lookup_enum_by_nr(attachment));
1700       return;
1701    }
1702
1703    if (renderbuffer) {
1704       rb = _mesa_lookup_renderbuffer(ctx, renderbuffer);
1705       if (!rb) {
1706          _mesa_error(ctx, GL_INVALID_OPERATION,
1707                      "glFramebufferRenderbufferEXT(non-existant"
1708                      " renderbuffer %u)", renderbuffer);
1709          return;
1710       }
1711    }
1712    else {
1713       /* remove renderbuffer attachment */
1714       rb = NULL;
1715    }
1716
1717    if (attachment == GL_DEPTH_STENCIL_ATTACHMENT) {
1718       /* make sure the renderbuffer is a depth/stencil format */
1719       const GLenum baseFormat =
1720          _mesa_get_format_base_format(att->Renderbuffer->Format);
1721       if (baseFormat != GL_DEPTH_STENCIL) {
1722          _mesa_error(ctx, GL_INVALID_OPERATION,
1723                      "glFramebufferRenderbufferEXT(renderbuffer"
1724                      " is not DEPTH_STENCIL format)");
1725          return;
1726       }
1727    }
1728
1729
1730    FLUSH_VERTICES(ctx, _NEW_BUFFERS);
1731
1732    assert(ctx->Driver.FramebufferRenderbuffer);
1733    ctx->Driver.FramebufferRenderbuffer(ctx, fb, attachment, rb);
1734
1735    /* Some subsequent GL commands may depend on the framebuffer's visual
1736     * after the binding is updated.  Update visual info now.
1737     */
1738    _mesa_update_framebuffer_visual(fb);
1739 }
1740
1741
1742 void GLAPIENTRY
1743 _mesa_GetFramebufferAttachmentParameterivEXT(GLenum target, GLenum attachment,
1744                                              GLenum pname, GLint *params)
1745 {
1746    const struct gl_renderbuffer_attachment *att;
1747    struct gl_framebuffer *buffer;
1748    GET_CURRENT_CONTEXT(ctx);
1749
1750    ASSERT_OUTSIDE_BEGIN_END(ctx);
1751
1752    switch (target) {
1753 #if FEATURE_EXT_framebuffer_blit
1754    case GL_DRAW_FRAMEBUFFER_EXT:
1755       if (!ctx->Extensions.EXT_framebuffer_blit) {
1756          _mesa_error(ctx, GL_INVALID_ENUM,
1757                      "glGetFramebufferAttachmentParameterivEXT(target)");
1758          return;
1759       }
1760       buffer = ctx->DrawBuffer;
1761       break;
1762    case GL_READ_FRAMEBUFFER_EXT:
1763       if (!ctx->Extensions.EXT_framebuffer_blit) {
1764          _mesa_error(ctx, GL_INVALID_ENUM,
1765                      "glGetFramebufferAttachmentParameterivEXT(target)");
1766          return;
1767       }
1768       buffer = ctx->ReadBuffer;
1769       break;
1770 #endif
1771    case GL_FRAMEBUFFER_EXT:
1772       buffer = ctx->DrawBuffer;
1773       break;
1774    default:
1775       _mesa_error(ctx, GL_INVALID_ENUM,
1776                   "glGetFramebufferAttachmentParameterivEXT(target)");
1777       return;
1778    }
1779
1780    if (buffer->Name == 0) {
1781       _mesa_error(ctx, GL_INVALID_OPERATION,
1782                   "glGetFramebufferAttachmentParameterivEXT");
1783       return;
1784    }
1785
1786    att = _mesa_get_attachment(ctx, buffer, attachment);
1787    if (att == NULL) {
1788       _mesa_error(ctx, GL_INVALID_ENUM,
1789                   "glGetFramebufferAttachmentParameterivEXT(attachment)");
1790       return;
1791    }
1792
1793    if (attachment == GL_DEPTH_STENCIL_ATTACHMENT) {
1794       /* the depth and stencil attachments must point to the same buffer */
1795       const struct gl_renderbuffer_attachment *depthAtt, *stencilAtt;
1796       depthAtt = _mesa_get_attachment(ctx, buffer, GL_DEPTH_ATTACHMENT);
1797       stencilAtt = _mesa_get_attachment(ctx, buffer, GL_STENCIL_ATTACHMENT);
1798       if (depthAtt->Renderbuffer != stencilAtt->Renderbuffer) {
1799          _mesa_error(ctx, GL_INVALID_OPERATION,
1800                      "glGetFramebufferAttachmentParameterivEXT(DEPTH/STENCIL"
1801                      " attachments differ)");
1802          return;
1803       }
1804    }
1805
1806    /* No need to flush here */
1807
1808    switch (pname) {
1809    case GL_FRAMEBUFFER_ATTACHMENT_OBJECT_TYPE_EXT:
1810       *params = att->Type;
1811       return;
1812    case GL_FRAMEBUFFER_ATTACHMENT_OBJECT_NAME_EXT:
1813       if (att->Type == GL_RENDERBUFFER_EXT) {
1814          *params = att->Renderbuffer->Name;
1815       }
1816       else if (att->Type == GL_TEXTURE) {
1817          *params = att->Texture->Name;
1818       }
1819       else {
1820          _mesa_error(ctx, GL_INVALID_ENUM,
1821                      "glGetFramebufferAttachmentParameterivEXT(pname)");
1822       }
1823       return;
1824    case GL_FRAMEBUFFER_ATTACHMENT_TEXTURE_LEVEL_EXT:
1825       if (att->Type == GL_TEXTURE) {
1826          *params = att->TextureLevel;
1827       }
1828       else {
1829          _mesa_error(ctx, GL_INVALID_ENUM,
1830                      "glGetFramebufferAttachmentParameterivEXT(pname)");
1831       }
1832       return;
1833    case GL_FRAMEBUFFER_ATTACHMENT_TEXTURE_CUBE_MAP_FACE_EXT:
1834       if (att->Type == GL_TEXTURE) {
1835          if (att->Texture && att->Texture->Target == GL_TEXTURE_CUBE_MAP) {
1836             *params = GL_TEXTURE_CUBE_MAP_POSITIVE_X + att->CubeMapFace;
1837          }
1838          else {
1839             *params = 0;
1840          }
1841       }
1842       else {
1843          _mesa_error(ctx, GL_INVALID_ENUM,
1844                      "glGetFramebufferAttachmentParameterivEXT(pname)");
1845       }
1846       return;
1847    case GL_FRAMEBUFFER_ATTACHMENT_TEXTURE_3D_ZOFFSET_EXT:
1848       if (att->Type == GL_TEXTURE) {
1849          if (att->Texture && att->Texture->Target == GL_TEXTURE_3D) {
1850             *params = att->Zoffset;
1851          }
1852          else {
1853             *params = 0;
1854          }
1855       }
1856       else {
1857          _mesa_error(ctx, GL_INVALID_ENUM,
1858                      "glGetFramebufferAttachmentParameterivEXT(pname)");
1859       }
1860       return;
1861    case GL_FRAMEBUFFER_ATTACHMENT_COLOR_ENCODING:
1862       if (!ctx->Extensions.ARB_framebuffer_object) {
1863          _mesa_error(ctx, GL_INVALID_ENUM,
1864                      "glGetFramebufferAttachmentParameterivEXT(pname)");
1865       }
1866       else {
1867          *params = _mesa_get_format_color_encoding(att->Renderbuffer->Format);
1868       }
1869       return;
1870    case GL_FRAMEBUFFER_ATTACHMENT_COMPONENT_TYPE:
1871       if (!ctx->Extensions.ARB_framebuffer_object) {
1872          _mesa_error(ctx, GL_INVALID_ENUM,
1873                      "glGetFramebufferAttachmentParameterivEXT(pname)");
1874          return;
1875       }
1876       else {
1877          gl_format format = att->Renderbuffer->Format;
1878          if (format == MESA_FORMAT_CI8 || format == MESA_FORMAT_S8) {
1879             /* special cases */
1880             *params = GL_INDEX;
1881          }
1882          else {
1883             *params = _mesa_get_format_datatype(format);
1884          }
1885       }
1886       return;
1887    case GL_FRAMEBUFFER_ATTACHMENT_RED_SIZE:
1888    case GL_FRAMEBUFFER_ATTACHMENT_GREEN_SIZE:
1889    case GL_FRAMEBUFFER_ATTACHMENT_BLUE_SIZE:
1890    case GL_FRAMEBUFFER_ATTACHMENT_ALPHA_SIZE:
1891    case GL_FRAMEBUFFER_ATTACHMENT_DEPTH_SIZE:
1892    case GL_FRAMEBUFFER_ATTACHMENT_STENCIL_SIZE:
1893       if (!ctx->Extensions.ARB_framebuffer_object) {
1894          _mesa_error(ctx, GL_INVALID_ENUM,
1895                      "glGetFramebufferAttachmentParameterivEXT(pname)");
1896       }
1897       else if (att->Texture) {
1898          const struct gl_texture_image *texImage =
1899             _mesa_select_tex_image(ctx, att->Texture, att->Texture->Target,
1900                                    att->TextureLevel);
1901          if (texImage) {
1902             *params = get_component_bits(pname, texImage->_BaseFormat,
1903                                          texImage->TexFormat);
1904          }
1905          else {
1906             *params = 0;
1907          }
1908       }
1909       else if (att->Renderbuffer) {
1910          *params = get_component_bits(pname, att->Renderbuffer->_BaseFormat,
1911                                       att->Renderbuffer->Format);
1912       }
1913       else {
1914          *params = 0;
1915       }
1916       return;
1917    default:
1918       _mesa_error(ctx, GL_INVALID_ENUM,
1919                   "glGetFramebufferAttachmentParameterivEXT(pname)");
1920       return;
1921    }
1922 }
1923
1924
1925 void GLAPIENTRY
1926 _mesa_GenerateMipmapEXT(GLenum target)
1927 {
1928    struct gl_texture_unit *texUnit;
1929    struct gl_texture_object *texObj;
1930    GET_CURRENT_CONTEXT(ctx);
1931
1932    ASSERT_OUTSIDE_BEGIN_END(ctx);
1933    FLUSH_VERTICES(ctx, _NEW_BUFFERS);
1934
1935    switch (target) {
1936    case GL_TEXTURE_1D:
1937    case GL_TEXTURE_2D:
1938    case GL_TEXTURE_3D:
1939    case GL_TEXTURE_CUBE_MAP:
1940       /* OK, legal value */
1941       break;
1942    default:
1943       _mesa_error(ctx, GL_INVALID_ENUM, "glGenerateMipmapEXT(target)");
1944       return;
1945    }
1946
1947    texUnit = _mesa_get_current_tex_unit(ctx);
1948    texObj = _mesa_select_tex_object(ctx, texUnit, target);
1949
1950    _mesa_lock_texture(ctx, texObj);
1951    if (target == GL_TEXTURE_CUBE_MAP) {
1952       GLuint face;
1953       for (face = 0; face < 6; face++)
1954          ctx->Driver.GenerateMipmap(ctx,
1955                                     GL_TEXTURE_CUBE_MAP_POSITIVE_X_ARB + face,
1956                                     texObj);
1957    }
1958    else {
1959       ctx->Driver.GenerateMipmap(ctx, target, texObj);
1960    }
1961    _mesa_unlock_texture(ctx, texObj);
1962 }
1963
1964
1965 #if FEATURE_EXT_framebuffer_blit
1966
1967 static const struct gl_renderbuffer_attachment *
1968 find_attachment(const struct gl_framebuffer *fb, const struct gl_renderbuffer *rb)
1969 {
1970    GLuint i;
1971    for (i = 0; i < Elements(fb->Attachment); i++) {
1972       if (fb->Attachment[i].Renderbuffer == rb)
1973          return &fb->Attachment[i];
1974    }
1975    return NULL;
1976 }
1977
1978
1979
1980 /**
1981  * Blit rectangular region, optionally from one framebuffer to another.
1982  *
1983  * Note, if the src buffer is multisampled and the dest is not, this is
1984  * when the samples must be resolved to a single color.
1985  */
1986 void GLAPIENTRY
1987 _mesa_BlitFramebufferEXT(GLint srcX0, GLint srcY0, GLint srcX1, GLint srcY1,
1988                          GLint dstX0, GLint dstY0, GLint dstX1, GLint dstY1,
1989                          GLbitfield mask, GLenum filter)
1990 {
1991    const GLbitfield legalMaskBits = (GL_COLOR_BUFFER_BIT |
1992                                      GL_DEPTH_BUFFER_BIT |
1993                                      GL_STENCIL_BUFFER_BIT);
1994    const struct gl_framebuffer *readFb, *drawFb;
1995    const struct gl_renderbuffer *colorReadRb, *colorDrawRb;
1996    GET_CURRENT_CONTEXT(ctx);
1997
1998    ASSERT_OUTSIDE_BEGIN_END(ctx);
1999    FLUSH_VERTICES(ctx, _NEW_BUFFERS);
2000
2001    if (ctx->NewState) {
2002       _mesa_update_state(ctx);
2003    }
2004
2005    readFb = ctx->ReadBuffer;
2006    drawFb = ctx->DrawBuffer;
2007
2008    if (!readFb || !drawFb) {
2009       /* This will normally never happen but someday we may want to
2010        * support MakeCurrent() with no drawables.
2011        */
2012       return;
2013    }
2014
2015    /* check for complete framebuffers */
2016    if (drawFb->_Status != GL_FRAMEBUFFER_COMPLETE_EXT ||
2017        readFb->_Status != GL_FRAMEBUFFER_COMPLETE_EXT) {
2018       _mesa_error(ctx, GL_INVALID_FRAMEBUFFER_OPERATION_EXT,
2019                   "glBlitFramebufferEXT(incomplete draw/read buffers)");
2020       return;
2021    }
2022
2023    if (filter != GL_NEAREST && filter != GL_LINEAR) {
2024       _mesa_error(ctx, GL_INVALID_ENUM, "glBlitFramebufferEXT(filter)");
2025       return;
2026    }
2027
2028    if (mask & ~legalMaskBits) {
2029       _mesa_error( ctx, GL_INVALID_VALUE, "glBlitFramebufferEXT(mask)");
2030       return;
2031    }
2032
2033    /* depth/stencil must be blitted with nearest filtering */
2034    if ((mask & (GL_DEPTH_BUFFER_BIT | GL_STENCIL_BUFFER_BIT))
2035         && filter != GL_NEAREST) {
2036       _mesa_error(ctx, GL_INVALID_OPERATION,
2037              "glBlitFramebufferEXT(depth/stencil requires GL_NEAREST filter");
2038       return;
2039    }
2040
2041    /* get color read/draw renderbuffers */
2042    if (mask & GL_COLOR_BUFFER_BIT) {
2043       colorReadRb = readFb->_ColorReadBuffer;
2044       colorDrawRb = drawFb->_ColorDrawBuffers[0];
2045    }
2046    else {
2047       colorReadRb = colorDrawRb = NULL;
2048    }
2049
2050    if (mask & GL_STENCIL_BUFFER_BIT) {
2051       struct gl_renderbuffer *readRb = readFb->_StencilBuffer;
2052       struct gl_renderbuffer *drawRb = drawFb->_StencilBuffer;
2053       if (!readRb ||
2054           !drawRb ||
2055           _mesa_get_format_bits(readRb->Format, GL_STENCIL_BITS) !=
2056           _mesa_get_format_bits(drawRb->Format, GL_STENCIL_BITS)) {
2057          _mesa_error(ctx, GL_INVALID_OPERATION,
2058                      "glBlitFramebufferEXT(stencil buffer size mismatch");
2059          return;
2060       }
2061    }
2062
2063    if (mask & GL_DEPTH_BUFFER_BIT) {
2064       struct gl_renderbuffer *readRb = readFb->_DepthBuffer;
2065       struct gl_renderbuffer *drawRb = drawFb->_DepthBuffer;
2066       if (!readRb ||
2067           !drawRb ||
2068           _mesa_get_format_bits(readRb->Format, GL_DEPTH_BITS) !=
2069           _mesa_get_format_bits(drawRb->Format, GL_DEPTH_BITS)) {
2070          _mesa_error(ctx, GL_INVALID_OPERATION,
2071                      "glBlitFramebufferEXT(depth buffer size mismatch");
2072          return;
2073       }
2074    }
2075
2076    if (readFb->Visual.samples > 0 &&
2077        drawFb->Visual.samples > 0 &&
2078        readFb->Visual.samples != drawFb->Visual.samples) {
2079       _mesa_error(ctx, GL_INVALID_OPERATION,
2080                   "glBlitFramebufferEXT(mismatched samples");
2081       return;
2082    }
2083
2084    /* extra checks for multisample copies... */
2085    if (readFb->Visual.samples > 0 || drawFb->Visual.samples > 0) {
2086       /* src and dest region sizes must be the same */
2087       if (srcX1 - srcX0 != dstX1 - dstX0 ||
2088           srcY1 - srcY0 != dstY1 - dstY0) {
2089          _mesa_error(ctx, GL_INVALID_OPERATION,
2090                 "glBlitFramebufferEXT(bad src/dst multisample region sizes");
2091          return;
2092       }
2093
2094       /* color formats must match */
2095       if (colorReadRb &&
2096           colorDrawRb &&
2097           colorReadRb->Format != colorDrawRb->Format) {
2098          _mesa_error(ctx, GL_INVALID_OPERATION,
2099                 "glBlitFramebufferEXT(bad src/dst multisample pixel formats");
2100          return;
2101       }
2102    }
2103
2104    if (!ctx->Extensions.EXT_framebuffer_blit) {
2105       _mesa_error(ctx, GL_INVALID_OPERATION, "glBlitFramebufferEXT");
2106       return;
2107    }
2108
2109    /* Debug code */
2110    if (DEBUG_BLIT) {
2111       _mesa_printf("glBlitFramebuffer(%d, %d, %d, %d,  %d, %d, %d, %d,"
2112                    " 0x%x, 0x%x)\n",
2113                    srcX0, srcY0, srcX1, srcY1,
2114                    dstX0, dstY0, dstX1, dstY1,
2115                    mask, filter);
2116       if (colorReadRb) {
2117          const struct gl_renderbuffer_attachment *att;
2118
2119          att = find_attachment(readFb, colorReadRb);
2120          _mesa_printf("  Src FBO %u  RB %u (%dx%d)  ",
2121                       readFb->Name, colorReadRb->Name,
2122                       colorReadRb->Width, colorReadRb->Height);
2123          if (att && att->Texture) {
2124             _mesa_printf("Tex %u  tgt 0x%x  level %u  face %u",
2125                          att->Texture->Name,
2126                          att->Texture->Target,
2127                          att->TextureLevel,
2128                          att->CubeMapFace);
2129          }
2130          _mesa_printf("\n");
2131
2132          att = find_attachment(drawFb, colorDrawRb);
2133          _mesa_printf("  Dst FBO %u  RB %u (%dx%d)  ",
2134                       drawFb->Name, colorDrawRb->Name,
2135                       colorDrawRb->Width, colorDrawRb->Height);
2136          if (att && att->Texture) {
2137             _mesa_printf("Tex %u  tgt 0x%x  level %u  face %u",
2138                          att->Texture->Name,
2139                          att->Texture->Target,
2140                          att->TextureLevel,
2141                          att->CubeMapFace);
2142          }
2143          _mesa_printf("\n");
2144       }
2145    }
2146
2147    ASSERT(ctx->Driver.BlitFramebuffer);
2148    ctx->Driver.BlitFramebuffer(ctx,
2149                                srcX0, srcY0, srcX1, srcY1,
2150                                dstX0, dstY0, dstX1, dstY1,
2151                                mask, filter);
2152 }
2153 #endif /* FEATURE_EXT_framebuffer_blit */