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