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          _mesa_reference_framebuffer(&ctx->ReadBuffer, newReadFb);
1292       }
1293    }
1294
1295    if (bindDrawBuf) {
1296       if (oldDrawFb->Name != 0) {
1297          check_end_texture_render(ctx, ctx->DrawBuffer);
1298       }
1299
1300       if (oldDrawFb == newDrawFb) {
1301          bindDrawBuf = GL_FALSE; /* no change */
1302       }
1303       else {
1304          FLUSH_VERTICES(ctx, _NEW_BUFFERS);
1305          _mesa_reference_framebuffer(&ctx->DrawBuffer, newDrawFb);
1306       }
1307
1308       if (newDrawFb->Name != 0) {
1309          /* check if newly bound framebuffer has any texture attachments */
1310          check_begin_texture_render(ctx, newDrawFb);
1311       }
1312    }
1313
1314    if ((bindDrawBuf || bindReadBuf) && ctx->Driver.BindFramebuffer) {
1315       ctx->Driver.BindFramebuffer(ctx, target, newDrawFb, newReadFb);
1316    }
1317 }
1318
1319
1320 void GLAPIENTRY
1321 _mesa_DeleteFramebuffersEXT(GLsizei n, const GLuint *framebuffers)
1322 {
1323    GLint i;
1324    GET_CURRENT_CONTEXT(ctx);
1325
1326    ASSERT_OUTSIDE_BEGIN_END(ctx);
1327    FLUSH_VERTICES(ctx, _NEW_BUFFERS);
1328
1329    for (i = 0; i < n; i++) {
1330       if (framebuffers[i] > 0) {
1331          struct gl_framebuffer *fb;
1332          fb = _mesa_lookup_framebuffer(ctx, framebuffers[i]);
1333          if (fb) {
1334             ASSERT(fb == &DummyFramebuffer || fb->Name == framebuffers[i]);
1335
1336             /* check if deleting currently bound framebuffer object */
1337             if (fb == ctx->DrawBuffer) {
1338                /* bind default */
1339                ASSERT(fb->RefCount >= 2);
1340                _mesa_BindFramebufferEXT(GL_DRAW_FRAMEBUFFER_EXT, 0);
1341             }
1342             if (fb == ctx->ReadBuffer) {
1343                /* bind default */
1344                ASSERT(fb->RefCount >= 2);
1345                _mesa_BindFramebufferEXT(GL_READ_FRAMEBUFFER_EXT, 0);
1346             }
1347
1348             /* remove from hash table immediately, to free the ID */
1349             _mesa_HashRemove(ctx->Shared->FrameBuffers, framebuffers[i]);
1350
1351             if (fb != &DummyFramebuffer) {
1352                /* But the object will not be freed until it's no longer
1353                 * bound in any context.
1354                 */
1355                _mesa_reference_framebuffer(&fb, NULL);
1356             }
1357          }
1358       }
1359    }
1360 }
1361
1362
1363 void GLAPIENTRY
1364 _mesa_GenFramebuffersEXT(GLsizei n, GLuint *framebuffers)
1365 {
1366    GET_CURRENT_CONTEXT(ctx);
1367    GLuint first;
1368    GLint i;
1369
1370    ASSERT_OUTSIDE_BEGIN_END(ctx);
1371
1372    if (n < 0) {
1373       _mesa_error(ctx, GL_INVALID_VALUE, "glGenFramebuffersEXT(n)");
1374       return;
1375    }
1376
1377    if (!framebuffers)
1378       return;
1379
1380    first = _mesa_HashFindFreeKeyBlock(ctx->Shared->FrameBuffers, n);
1381
1382    for (i = 0; i < n; i++) {
1383       GLuint name = first + i;
1384       framebuffers[i] = name;
1385       /* insert dummy placeholder into hash table */
1386       _glthread_LOCK_MUTEX(ctx->Shared->Mutex);
1387       _mesa_HashInsert(ctx->Shared->FrameBuffers, name, &DummyFramebuffer);
1388       _glthread_UNLOCK_MUTEX(ctx->Shared->Mutex);
1389    }
1390 }
1391
1392
1393
1394 GLenum GLAPIENTRY
1395 _mesa_CheckFramebufferStatusEXT(GLenum target)
1396 {
1397    struct gl_framebuffer *buffer;
1398    GET_CURRENT_CONTEXT(ctx);
1399
1400    ASSERT_OUTSIDE_BEGIN_END_WITH_RETVAL(ctx, 0);
1401
1402    switch (target) {
1403 #if FEATURE_EXT_framebuffer_blit
1404    case GL_DRAW_FRAMEBUFFER_EXT:
1405       if (!ctx->Extensions.EXT_framebuffer_blit) {
1406          _mesa_error(ctx, GL_INVALID_ENUM, "glCheckFramebufferStatus(target)");
1407          return 0;
1408       }
1409       buffer = ctx->DrawBuffer;
1410       break;
1411    case GL_READ_FRAMEBUFFER_EXT:
1412       if (!ctx->Extensions.EXT_framebuffer_blit) {
1413          _mesa_error(ctx, GL_INVALID_ENUM, "glCheckFramebufferStatus(target)");
1414          return 0;
1415       }
1416       buffer = ctx->ReadBuffer;
1417       break;
1418 #endif
1419    case GL_FRAMEBUFFER_EXT:
1420       buffer = ctx->DrawBuffer;
1421       break;
1422    default:
1423       _mesa_error(ctx, GL_INVALID_ENUM, "glCheckFramebufferStatus(target)");
1424       return 0; /* formerly GL_FRAMEBUFFER_STATUS_ERROR_EXT */
1425    }
1426
1427    if (buffer->Name == 0) {
1428       /* The window system / default framebuffer is always complete */
1429       return GL_FRAMEBUFFER_COMPLETE_EXT;
1430    }
1431
1432    /* No need to flush here */
1433
1434    if (buffer->_Status != GL_FRAMEBUFFER_COMPLETE) {
1435       _mesa_test_framebuffer_completeness(ctx, buffer);
1436    }
1437
1438    return buffer->_Status;
1439 }
1440
1441
1442
1443 /**
1444  * Common code called by glFramebufferTexture1D/2D/3DEXT().
1445  */
1446 static void
1447 framebuffer_texture(GLcontext *ctx, const char *caller, GLenum target,
1448                     GLenum attachment, GLenum textarget, GLuint texture,
1449                     GLint level, GLint zoffset)
1450 {
1451    struct gl_renderbuffer_attachment *att;
1452    struct gl_texture_object *texObj = NULL;
1453    struct gl_framebuffer *fb;
1454    GLboolean error = GL_FALSE;
1455
1456    ASSERT_OUTSIDE_BEGIN_END(ctx);
1457
1458    switch (target) {
1459    case GL_READ_FRAMEBUFFER_EXT:
1460       error = !ctx->Extensions.EXT_framebuffer_blit;
1461       fb = ctx->ReadBuffer;
1462       break;
1463    case GL_DRAW_FRAMEBUFFER_EXT:
1464       error = !ctx->Extensions.EXT_framebuffer_blit;
1465       /* fall-through */
1466    case GL_FRAMEBUFFER_EXT:
1467       fb = ctx->DrawBuffer;
1468       break;
1469    default:
1470       error = GL_TRUE;
1471    }
1472
1473    if (error) {
1474       _mesa_error(ctx, GL_INVALID_ENUM,
1475                   "glFramebufferTexture%sEXT(target=0x%x)", caller, target);
1476       return;
1477    }
1478
1479    ASSERT(fb);
1480
1481    /* check framebuffer binding */
1482    if (fb->Name == 0) {
1483       _mesa_error(ctx, GL_INVALID_OPERATION,
1484                   "glFramebufferTexture%sEXT", caller);
1485       return;
1486    }
1487
1488
1489    /* The textarget, level, and zoffset parameters are only validated if
1490     * texture is non-zero.
1491     */
1492    if (texture) {
1493       GLboolean err = GL_TRUE;
1494
1495       texObj = _mesa_lookup_texture(ctx, texture);
1496       if (texObj != NULL) {
1497          if (textarget == 0) {
1498             err = (texObj->Target != GL_TEXTURE_3D) &&
1499                 (texObj->Target != GL_TEXTURE_1D_ARRAY_EXT) &&
1500                 (texObj->Target != GL_TEXTURE_2D_ARRAY_EXT);
1501          }
1502          else {
1503             err = (texObj->Target == GL_TEXTURE_CUBE_MAP)
1504                 ? !IS_CUBE_FACE(textarget)
1505                 : (texObj->Target != textarget);
1506          }
1507       }
1508
1509       if (err) {
1510          _mesa_error(ctx, GL_INVALID_OPERATION,
1511                      "glFramebufferTexture%sEXT(texture target mismatch)",
1512                      caller);
1513          return;
1514       }
1515
1516       if (texObj->Target == GL_TEXTURE_3D) {
1517          const GLint maxSize = 1 << (ctx->Const.Max3DTextureLevels - 1);
1518          if (zoffset < 0 || zoffset >= maxSize) {
1519             _mesa_error(ctx, GL_INVALID_VALUE,
1520                         "glFramebufferTexture%sEXT(zoffset)", caller);
1521             return;
1522          }
1523       }
1524       else if ((texObj->Target == GL_TEXTURE_1D_ARRAY_EXT) ||
1525                (texObj->Target == GL_TEXTURE_2D_ARRAY_EXT)) {
1526          if (zoffset < 0 || zoffset >= ctx->Const.MaxArrayTextureLayers) {
1527             _mesa_error(ctx, GL_INVALID_VALUE,
1528                         "glFramebufferTexture%sEXT(layer)", caller);
1529             return;
1530          }
1531       }
1532
1533       if ((level < 0) ||
1534           (level >= _mesa_max_texture_levels(ctx, texObj->Target))) {
1535          _mesa_error(ctx, GL_INVALID_VALUE,
1536                      "glFramebufferTexture%sEXT(level)", caller);
1537          return;
1538       }
1539    }
1540
1541    att = _mesa_get_attachment(ctx, fb, attachment);
1542    if (att == NULL) {
1543       _mesa_error(ctx, GL_INVALID_ENUM,
1544                   "glFramebufferTexture%sEXT(attachment)", caller);
1545       return;
1546    }
1547
1548    FLUSH_VERTICES(ctx, _NEW_BUFFERS);
1549
1550    _glthread_LOCK_MUTEX(fb->Mutex);
1551    if (texObj) {
1552       _mesa_set_texture_attachment(ctx, fb, att, texObj, textarget,
1553                                    level, zoffset);
1554       /* Set the render-to-texture flag.  We'll check this flag in
1555        * glTexImage() and friends to determine if we need to revalidate
1556        * any FBOs that might be rendering into this texture.
1557        * This flag never gets cleared since it's non-trivial to determine
1558        * when all FBOs might be done rendering to this texture.  That's OK
1559        * though since it's uncommon to render to a texture then repeatedly
1560        * call glTexImage() to change images in the texture.
1561        */
1562       texObj->_RenderToTexture = GL_TRUE;
1563    }
1564    else {
1565       _mesa_remove_attachment(ctx, att);
1566    }
1567
1568    invalidate_framebuffer(fb);
1569
1570    _glthread_UNLOCK_MUTEX(fb->Mutex);
1571 }
1572
1573
1574
1575 void GLAPIENTRY
1576 _mesa_FramebufferTexture1DEXT(GLenum target, GLenum attachment,
1577                               GLenum textarget, GLuint texture, GLint level)
1578 {
1579    GET_CURRENT_CONTEXT(ctx);
1580
1581    if ((texture != 0) && (textarget != GL_TEXTURE_1D)) {
1582       _mesa_error(ctx, GL_INVALID_ENUM,
1583                   "glFramebufferTexture1DEXT(textarget)");
1584       return;
1585    }
1586
1587    framebuffer_texture(ctx, "1D", target, attachment, textarget, texture,
1588                        level, 0);
1589 }
1590
1591
1592 void GLAPIENTRY
1593 _mesa_FramebufferTexture2DEXT(GLenum target, GLenum attachment,
1594                               GLenum textarget, GLuint texture, GLint level)
1595 {
1596    GET_CURRENT_CONTEXT(ctx);
1597
1598    if ((texture != 0) &&
1599        (textarget != GL_TEXTURE_2D) &&
1600        (textarget != GL_TEXTURE_RECTANGLE_ARB) &&
1601        (!IS_CUBE_FACE(textarget))) {
1602       _mesa_error(ctx, GL_INVALID_OPERATION,
1603                   "glFramebufferTexture2DEXT(textarget=0x%x)", textarget);
1604       return;
1605    }
1606
1607    framebuffer_texture(ctx, "2D", target, attachment, textarget, texture,
1608                        level, 0);
1609 }
1610
1611
1612 void GLAPIENTRY
1613 _mesa_FramebufferTexture3DEXT(GLenum target, GLenum attachment,
1614                               GLenum textarget, GLuint texture,
1615                               GLint level, GLint zoffset)
1616 {
1617    GET_CURRENT_CONTEXT(ctx);
1618
1619    if ((texture != 0) && (textarget != GL_TEXTURE_3D)) {
1620       _mesa_error(ctx, GL_INVALID_ENUM,
1621                   "glFramebufferTexture3DEXT(textarget)");
1622       return;
1623    }
1624
1625    framebuffer_texture(ctx, "3D", target, attachment, textarget, texture,
1626                        level, zoffset);
1627 }
1628
1629
1630 void GLAPIENTRY
1631 _mesa_FramebufferTextureLayerEXT(GLenum target, GLenum attachment,
1632                                  GLuint texture, GLint level, GLint layer)
1633 {
1634    GET_CURRENT_CONTEXT(ctx);
1635
1636    framebuffer_texture(ctx, "Layer", target, attachment, 0, texture,
1637                        level, layer);
1638 }
1639
1640
1641 void GLAPIENTRY
1642 _mesa_FramebufferRenderbufferEXT(GLenum target, GLenum attachment,
1643                                  GLenum renderbufferTarget,
1644                                  GLuint renderbuffer)
1645 {
1646    struct gl_renderbuffer_attachment *att;
1647    struct gl_framebuffer *fb;
1648    struct gl_renderbuffer *rb;
1649    GET_CURRENT_CONTEXT(ctx);
1650
1651    ASSERT_OUTSIDE_BEGIN_END(ctx);
1652
1653    switch (target) {
1654 #if FEATURE_EXT_framebuffer_blit
1655    case GL_DRAW_FRAMEBUFFER_EXT:
1656       if (!ctx->Extensions.EXT_framebuffer_blit) {
1657          _mesa_error(ctx, GL_INVALID_ENUM,
1658                      "glFramebufferRenderbufferEXT(target)");
1659          return;
1660       }
1661       fb = ctx->DrawBuffer;
1662       break;
1663    case GL_READ_FRAMEBUFFER_EXT:
1664       if (!ctx->Extensions.EXT_framebuffer_blit) {
1665          _mesa_error(ctx, GL_INVALID_ENUM,
1666                      "glFramebufferRenderbufferEXT(target)");
1667          return;
1668       }
1669       fb = ctx->ReadBuffer;
1670       break;
1671 #endif
1672    case GL_FRAMEBUFFER_EXT:
1673       fb = ctx->DrawBuffer;
1674       break;
1675    default:
1676       _mesa_error(ctx, GL_INVALID_ENUM,
1677                   "glFramebufferRenderbufferEXT(target)");
1678       return;
1679    }
1680
1681    if (renderbufferTarget != GL_RENDERBUFFER_EXT) {
1682       _mesa_error(ctx, GL_INVALID_ENUM,
1683                   "glFramebufferRenderbufferEXT(renderbufferTarget)");
1684       return;
1685    }
1686
1687    if (fb->Name == 0) {
1688       /* Can't attach new renderbuffers to a window system framebuffer */
1689       _mesa_error(ctx, GL_INVALID_OPERATION, "glFramebufferRenderbufferEXT");
1690       return;
1691    }
1692
1693    att = _mesa_get_attachment(ctx, fb, attachment);
1694    if (att == NULL) {
1695       _mesa_error(ctx, GL_INVALID_ENUM,
1696                   "glFramebufferRenderbufferEXT(invalid attachment %s)",
1697                   _mesa_lookup_enum_by_nr(attachment));
1698       return;
1699    }
1700
1701    if (renderbuffer) {
1702       rb = _mesa_lookup_renderbuffer(ctx, renderbuffer);
1703       if (!rb) {
1704          _mesa_error(ctx, GL_INVALID_OPERATION,
1705                      "glFramebufferRenderbufferEXT(non-existant"
1706                      " renderbuffer %u)", renderbuffer);
1707          return;
1708       }
1709    }
1710    else {
1711       /* remove renderbuffer attachment */
1712       rb = NULL;
1713    }
1714
1715    if (attachment == GL_DEPTH_STENCIL_ATTACHMENT) {
1716       /* make sure the renderbuffer is a depth/stencil format */
1717       const GLenum baseFormat =
1718          _mesa_get_format_base_format(att->Renderbuffer->Format);
1719       if (baseFormat != GL_DEPTH_STENCIL) {
1720          _mesa_error(ctx, GL_INVALID_OPERATION,
1721                      "glFramebufferRenderbufferEXT(renderbuffer"
1722                      " is not DEPTH_STENCIL format)");
1723          return;
1724       }
1725    }
1726
1727
1728    FLUSH_VERTICES(ctx, _NEW_BUFFERS);
1729
1730    assert(ctx->Driver.FramebufferRenderbuffer);
1731    ctx->Driver.FramebufferRenderbuffer(ctx, fb, attachment, rb);
1732
1733    /* Some subsequent GL commands may depend on the framebuffer's visual
1734     * after the binding is updated.  Update visual info now.
1735     */
1736    _mesa_update_framebuffer_visual(fb);
1737 }
1738
1739
1740 void GLAPIENTRY
1741 _mesa_GetFramebufferAttachmentParameterivEXT(GLenum target, GLenum attachment,
1742                                              GLenum pname, GLint *params)
1743 {
1744    const struct gl_renderbuffer_attachment *att;
1745    struct gl_framebuffer *buffer;
1746    GET_CURRENT_CONTEXT(ctx);
1747
1748    ASSERT_OUTSIDE_BEGIN_END(ctx);
1749
1750    switch (target) {
1751 #if FEATURE_EXT_framebuffer_blit
1752    case GL_DRAW_FRAMEBUFFER_EXT:
1753       if (!ctx->Extensions.EXT_framebuffer_blit) {
1754          _mesa_error(ctx, GL_INVALID_ENUM,
1755                      "glGetFramebufferAttachmentParameterivEXT(target)");
1756          return;
1757       }
1758       buffer = ctx->DrawBuffer;
1759       break;
1760    case GL_READ_FRAMEBUFFER_EXT:
1761       if (!ctx->Extensions.EXT_framebuffer_blit) {
1762          _mesa_error(ctx, GL_INVALID_ENUM,
1763                      "glGetFramebufferAttachmentParameterivEXT(target)");
1764          return;
1765       }
1766       buffer = ctx->ReadBuffer;
1767       break;
1768 #endif
1769    case GL_FRAMEBUFFER_EXT:
1770       buffer = ctx->DrawBuffer;
1771       break;
1772    default:
1773       _mesa_error(ctx, GL_INVALID_ENUM,
1774                   "glGetFramebufferAttachmentParameterivEXT(target)");
1775       return;
1776    }
1777
1778    if (buffer->Name == 0) {
1779       _mesa_error(ctx, GL_INVALID_OPERATION,
1780                   "glGetFramebufferAttachmentParameterivEXT");
1781       return;
1782    }
1783
1784    att = _mesa_get_attachment(ctx, buffer, attachment);
1785    if (att == NULL) {
1786       _mesa_error(ctx, GL_INVALID_ENUM,
1787                   "glGetFramebufferAttachmentParameterivEXT(attachment)");
1788       return;
1789    }
1790
1791    if (attachment == GL_DEPTH_STENCIL_ATTACHMENT) {
1792       /* the depth and stencil attachments must point to the same buffer */
1793       const struct gl_renderbuffer_attachment *depthAtt, *stencilAtt;
1794       depthAtt = _mesa_get_attachment(ctx, buffer, GL_DEPTH_ATTACHMENT);
1795       stencilAtt = _mesa_get_attachment(ctx, buffer, GL_STENCIL_ATTACHMENT);
1796       if (depthAtt->Renderbuffer != stencilAtt->Renderbuffer) {
1797          _mesa_error(ctx, GL_INVALID_OPERATION,
1798                      "glGetFramebufferAttachmentParameterivEXT(DEPTH/STENCIL"
1799                      " attachments differ)");
1800          return;
1801       }
1802    }
1803
1804    /* No need to flush here */
1805
1806    switch (pname) {
1807    case GL_FRAMEBUFFER_ATTACHMENT_OBJECT_TYPE_EXT:
1808       *params = att->Type;
1809       return;
1810    case GL_FRAMEBUFFER_ATTACHMENT_OBJECT_NAME_EXT:
1811       if (att->Type == GL_RENDERBUFFER_EXT) {
1812          *params = att->Renderbuffer->Name;
1813       }
1814       else if (att->Type == GL_TEXTURE) {
1815          *params = att->Texture->Name;
1816       }
1817       else {
1818          _mesa_error(ctx, GL_INVALID_ENUM,
1819                      "glGetFramebufferAttachmentParameterivEXT(pname)");
1820       }
1821       return;
1822    case GL_FRAMEBUFFER_ATTACHMENT_TEXTURE_LEVEL_EXT:
1823       if (att->Type == GL_TEXTURE) {
1824          *params = att->TextureLevel;
1825       }
1826       else {
1827          _mesa_error(ctx, GL_INVALID_ENUM,
1828                      "glGetFramebufferAttachmentParameterivEXT(pname)");
1829       }
1830       return;
1831    case GL_FRAMEBUFFER_ATTACHMENT_TEXTURE_CUBE_MAP_FACE_EXT:
1832       if (att->Type == GL_TEXTURE) {
1833          if (att->Texture && att->Texture->Target == GL_TEXTURE_CUBE_MAP) {
1834             *params = GL_TEXTURE_CUBE_MAP_POSITIVE_X + att->CubeMapFace;
1835          }
1836          else {
1837             *params = 0;
1838          }
1839       }
1840       else {
1841          _mesa_error(ctx, GL_INVALID_ENUM,
1842                      "glGetFramebufferAttachmentParameterivEXT(pname)");
1843       }
1844       return;
1845    case GL_FRAMEBUFFER_ATTACHMENT_TEXTURE_3D_ZOFFSET_EXT:
1846       if (att->Type == GL_TEXTURE) {
1847          if (att->Texture && att->Texture->Target == GL_TEXTURE_3D) {
1848             *params = att->Zoffset;
1849          }
1850          else {
1851             *params = 0;
1852          }
1853       }
1854       else {
1855          _mesa_error(ctx, GL_INVALID_ENUM,
1856                      "glGetFramebufferAttachmentParameterivEXT(pname)");
1857       }
1858       return;
1859    case GL_FRAMEBUFFER_ATTACHMENT_COLOR_ENCODING:
1860       if (!ctx->Extensions.ARB_framebuffer_object) {
1861          _mesa_error(ctx, GL_INVALID_ENUM,
1862                      "glGetFramebufferAttachmentParameterivEXT(pname)");
1863       }
1864       else {
1865          *params = _mesa_get_format_color_encoding(att->Renderbuffer->Format);
1866       }
1867       return;
1868    case GL_FRAMEBUFFER_ATTACHMENT_COMPONENT_TYPE:
1869       if (!ctx->Extensions.ARB_framebuffer_object) {
1870          _mesa_error(ctx, GL_INVALID_ENUM,
1871                      "glGetFramebufferAttachmentParameterivEXT(pname)");
1872          return;
1873       }
1874       else {
1875          gl_format format = att->Renderbuffer->Format;
1876          if (format == MESA_FORMAT_CI8 || format == MESA_FORMAT_S8) {
1877             /* special cases */
1878             *params = GL_INDEX;
1879          }
1880          else {
1881             *params = _mesa_get_format_datatype(format);
1882          }
1883       }
1884       return;
1885    case GL_FRAMEBUFFER_ATTACHMENT_RED_SIZE:
1886    case GL_FRAMEBUFFER_ATTACHMENT_GREEN_SIZE:
1887    case GL_FRAMEBUFFER_ATTACHMENT_BLUE_SIZE:
1888    case GL_FRAMEBUFFER_ATTACHMENT_ALPHA_SIZE:
1889    case GL_FRAMEBUFFER_ATTACHMENT_DEPTH_SIZE:
1890    case GL_FRAMEBUFFER_ATTACHMENT_STENCIL_SIZE:
1891       if (!ctx->Extensions.ARB_framebuffer_object) {
1892          _mesa_error(ctx, GL_INVALID_ENUM,
1893                      "glGetFramebufferAttachmentParameterivEXT(pname)");
1894       }
1895       else if (att->Texture) {
1896          const struct gl_texture_image *texImage =
1897             _mesa_select_tex_image(ctx, att->Texture, att->Texture->Target,
1898                                    att->TextureLevel);
1899          if (texImage) {
1900             *params = get_component_bits(pname, texImage->_BaseFormat,
1901                                          texImage->TexFormat);
1902          }
1903          else {
1904             *params = 0;
1905          }
1906       }
1907       else if (att->Renderbuffer) {
1908          *params = get_component_bits(pname, att->Renderbuffer->_BaseFormat,
1909                                       att->Renderbuffer->Format);
1910       }
1911       else {
1912          *params = 0;
1913       }
1914       return;
1915    default:
1916       _mesa_error(ctx, GL_INVALID_ENUM,
1917                   "glGetFramebufferAttachmentParameterivEXT(pname)");
1918       return;
1919    }
1920 }
1921
1922
1923 void GLAPIENTRY
1924 _mesa_GenerateMipmapEXT(GLenum target)
1925 {
1926    struct gl_texture_unit *texUnit;
1927    struct gl_texture_object *texObj;
1928    GET_CURRENT_CONTEXT(ctx);
1929
1930    ASSERT_OUTSIDE_BEGIN_END(ctx);
1931    FLUSH_VERTICES(ctx, _NEW_BUFFERS);
1932
1933    switch (target) {
1934    case GL_TEXTURE_1D:
1935    case GL_TEXTURE_2D:
1936    case GL_TEXTURE_3D:
1937    case GL_TEXTURE_CUBE_MAP:
1938       /* OK, legal value */
1939       break;
1940    default:
1941       _mesa_error(ctx, GL_INVALID_ENUM, "glGenerateMipmapEXT(target)");
1942       return;
1943    }
1944
1945    texUnit = _mesa_get_current_tex_unit(ctx);
1946    texObj = _mesa_select_tex_object(ctx, texUnit, target);
1947
1948    _mesa_lock_texture(ctx, texObj);
1949    if (target == GL_TEXTURE_CUBE_MAP) {
1950       GLuint face;
1951       for (face = 0; face < 6; face++)
1952          ctx->Driver.GenerateMipmap(ctx,
1953                                     GL_TEXTURE_CUBE_MAP_POSITIVE_X_ARB + face,
1954                                     texObj);
1955    }
1956    else {
1957       ctx->Driver.GenerateMipmap(ctx, target, texObj);
1958    }
1959    _mesa_unlock_texture(ctx, texObj);
1960 }
1961
1962
1963 #if FEATURE_EXT_framebuffer_blit
1964
1965 static const struct gl_renderbuffer_attachment *
1966 find_attachment(const struct gl_framebuffer *fb, const struct gl_renderbuffer *rb)
1967 {
1968    GLuint i;
1969    for (i = 0; i < Elements(fb->Attachment); i++) {
1970       if (fb->Attachment[i].Renderbuffer == rb)
1971          return &fb->Attachment[i];
1972    }
1973    return NULL;
1974 }
1975
1976
1977
1978 /**
1979  * Blit rectangular region, optionally from one framebuffer to another.
1980  *
1981  * Note, if the src buffer is multisampled and the dest is not, this is
1982  * when the samples must be resolved to a single color.
1983  */
1984 void GLAPIENTRY
1985 _mesa_BlitFramebufferEXT(GLint srcX0, GLint srcY0, GLint srcX1, GLint srcY1,
1986                          GLint dstX0, GLint dstY0, GLint dstX1, GLint dstY1,
1987                          GLbitfield mask, GLenum filter)
1988 {
1989    const GLbitfield legalMaskBits = (GL_COLOR_BUFFER_BIT |
1990                                      GL_DEPTH_BUFFER_BIT |
1991                                      GL_STENCIL_BUFFER_BIT);
1992    const struct gl_framebuffer *readFb, *drawFb;
1993    const struct gl_renderbuffer *colorReadRb, *colorDrawRb;
1994    GET_CURRENT_CONTEXT(ctx);
1995
1996    ASSERT_OUTSIDE_BEGIN_END(ctx);
1997    FLUSH_VERTICES(ctx, _NEW_BUFFERS);
1998
1999    if (ctx->NewState) {
2000       _mesa_update_state(ctx);
2001    }
2002
2003    readFb = ctx->ReadBuffer;
2004    drawFb = ctx->DrawBuffer;
2005
2006    if (!readFb || !drawFb) {
2007       /* This will normally never happen but someday we may want to
2008        * support MakeCurrent() with no drawables.
2009        */
2010       return;
2011    }
2012
2013    /* check for complete framebuffers */
2014    if (drawFb->_Status != GL_FRAMEBUFFER_COMPLETE_EXT ||
2015        readFb->_Status != GL_FRAMEBUFFER_COMPLETE_EXT) {
2016       _mesa_error(ctx, GL_INVALID_FRAMEBUFFER_OPERATION_EXT,
2017                   "glBlitFramebufferEXT(incomplete draw/read buffers)");
2018       return;
2019    }
2020
2021    if (filter != GL_NEAREST && filter != GL_LINEAR) {
2022       _mesa_error(ctx, GL_INVALID_ENUM, "glBlitFramebufferEXT(filter)");
2023       return;
2024    }
2025
2026    if (mask & ~legalMaskBits) {
2027       _mesa_error( ctx, GL_INVALID_VALUE, "glBlitFramebufferEXT(mask)");
2028       return;
2029    }
2030
2031    /* depth/stencil must be blitted with nearest filtering */
2032    if ((mask & (GL_DEPTH_BUFFER_BIT | GL_STENCIL_BUFFER_BIT))
2033         && filter != GL_NEAREST) {
2034       _mesa_error(ctx, GL_INVALID_OPERATION,
2035              "glBlitFramebufferEXT(depth/stencil requires GL_NEAREST filter");
2036       return;
2037    }
2038
2039    /* get color read/draw renderbuffers */
2040    if (mask & GL_COLOR_BUFFER_BIT) {
2041       colorReadRb = readFb->_ColorReadBuffer;
2042       colorDrawRb = drawFb->_ColorDrawBuffers[0];
2043    }
2044    else {
2045       colorReadRb = colorDrawRb = NULL;
2046    }
2047
2048    if (mask & GL_STENCIL_BUFFER_BIT) {
2049       struct gl_renderbuffer *readRb = readFb->_StencilBuffer;
2050       struct gl_renderbuffer *drawRb = drawFb->_StencilBuffer;
2051       if (!readRb ||
2052           !drawRb ||
2053           _mesa_get_format_bits(readRb->Format, GL_STENCIL_BITS) !=
2054           _mesa_get_format_bits(drawRb->Format, GL_STENCIL_BITS)) {
2055          _mesa_error(ctx, GL_INVALID_OPERATION,
2056                      "glBlitFramebufferEXT(stencil buffer size mismatch");
2057          return;
2058       }
2059    }
2060
2061    if (mask & GL_DEPTH_BUFFER_BIT) {
2062       struct gl_renderbuffer *readRb = readFb->_DepthBuffer;
2063       struct gl_renderbuffer *drawRb = drawFb->_DepthBuffer;
2064       if (!readRb ||
2065           !drawRb ||
2066           _mesa_get_format_bits(readRb->Format, GL_DEPTH_BITS) !=
2067           _mesa_get_format_bits(drawRb->Format, GL_DEPTH_BITS)) {
2068          _mesa_error(ctx, GL_INVALID_OPERATION,
2069                      "glBlitFramebufferEXT(depth buffer size mismatch");
2070          return;
2071       }
2072    }
2073
2074    if (readFb->Visual.samples > 0 &&
2075        drawFb->Visual.samples > 0 &&
2076        readFb->Visual.samples != drawFb->Visual.samples) {
2077       _mesa_error(ctx, GL_INVALID_OPERATION,
2078                   "glBlitFramebufferEXT(mismatched samples");
2079       return;
2080    }
2081
2082    /* extra checks for multisample copies... */
2083    if (readFb->Visual.samples > 0 || drawFb->Visual.samples > 0) {
2084       /* src and dest region sizes must be the same */
2085       if (srcX1 - srcX0 != dstX1 - dstX0 ||
2086           srcY1 - srcY0 != dstY1 - dstY0) {
2087          _mesa_error(ctx, GL_INVALID_OPERATION,
2088                 "glBlitFramebufferEXT(bad src/dst multisample region sizes");
2089          return;
2090       }
2091
2092       /* color formats must match */
2093       if (colorReadRb &&
2094           colorDrawRb &&
2095           colorReadRb->Format != colorDrawRb->Format) {
2096          _mesa_error(ctx, GL_INVALID_OPERATION,
2097                 "glBlitFramebufferEXT(bad src/dst multisample pixel formats");
2098          return;
2099       }
2100    }
2101
2102    if (!ctx->Extensions.EXT_framebuffer_blit) {
2103       _mesa_error(ctx, GL_INVALID_OPERATION, "glBlitFramebufferEXT");
2104       return;
2105    }
2106
2107    /* Debug code */
2108    if (DEBUG_BLIT) {
2109       _mesa_printf("glBlitFramebuffer(%d, %d, %d, %d,  %d, %d, %d, %d,"
2110                    " 0x%x, 0x%x)\n",
2111                    srcX0, srcY0, srcX1, srcY1,
2112                    dstX0, dstY0, dstX1, dstY1,
2113                    mask, filter);
2114       if (colorReadRb) {
2115          const struct gl_renderbuffer_attachment *att;
2116
2117          att = find_attachment(readFb, colorReadRb);
2118          _mesa_printf("  Src FBO %u  RB %u (%dx%d)  ",
2119                       readFb->Name, colorReadRb->Name,
2120                       colorReadRb->Width, colorReadRb->Height);
2121          if (att && att->Texture) {
2122             _mesa_printf("Tex %u  tgt 0x%x  level %u  face %u",
2123                          att->Texture->Name,
2124                          att->Texture->Target,
2125                          att->TextureLevel,
2126                          att->CubeMapFace);
2127          }
2128          _mesa_printf("\n");
2129
2130          att = find_attachment(drawFb, colorDrawRb);
2131          _mesa_printf("  Dst FBO %u  RB %u (%dx%d)  ",
2132                       drawFb->Name, colorDrawRb->Name,
2133                       colorDrawRb->Width, colorDrawRb->Height);
2134          if (att && att->Texture) {
2135             _mesa_printf("Tex %u  tgt 0x%x  level %u  face %u",
2136                          att->Texture->Name,
2137                          att->Texture->Target,
2138                          att->TextureLevel,
2139                          att->CubeMapFace);
2140          }
2141          _mesa_printf("\n");
2142       }
2143    }
2144
2145    ASSERT(ctx->Driver.BlitFramebuffer);
2146    ctx->Driver.BlitFramebuffer(ctx,
2147                                srcX0, srcY0, srcX1, srcY1,
2148                                dstX0, dstY0, dstX1, dstY1,
2149                                mask, filter);
2150 }
2151 #endif /* FEATURE_EXT_framebuffer_blit */