git.cworth.org Git - apitrace/blob - retrace/glstate_images.cpp

   1 /**************************************************************************
   2  *
   3  * Copyright 2011 Jose Fonseca
   4  * All Rights Reserved.
   5  *
   6  * Permission is hereby granted, free of charge, to any person obtaining a copy
   7  * of this software and associated documentation files (the "Software"), to deal
   8  * in the Software without restriction, including without limitation the rights
   9  * to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
  10  * copies of the Software, and to permit persons to whom the Software is
  11  * furnished to do so, subject to the following conditions:
  12  *
  13  * The above copyright notice and this permission notice shall be included in
  14  * all copies or substantial portions of the Software.
  15  *
  16  * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
  17  * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
  18  * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
  19  * AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
  20  * LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
  21  * OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN
  22  * THE SOFTWARE.
  23  *
  24  **************************************************************************/
  25
  26
  27 #include <assert.h>
  28 #include <string.h>
  29
  30 #include <algorithm>
  31 #include <iostream>
  32
  33 #include "image.hpp"
  34 #include "json.hpp"
  35 #include "glproc.hpp"
  36 #include "glsize.hpp"
  37 #include "glstate.hpp"
  38 #include "glstate_internal.hpp"
  39
  40
  41 #ifdef __linux__
  42 #include <dlfcn.h>
  43 #endif
  44
  45 #ifdef __APPLE__
  46
  47 #include <Carbon/Carbon.h>
  48
  49 #ifdef __cplusplus
  50 extern "C" {
  51 #endif
  52
  53 OSStatus CGSGetSurfaceBounds(CGSConnectionID, CGWindowID, CGSSurfaceID, CGRect *);
  54
  55 #ifdef __cplusplus
  56 }
  57 #endif
  58
  59 #endif /* __APPLE__ */
  60
  61
  62 /* Change thi to one to force interpreting depth buffers as RGBA, which enables
  63  * visualizing full dynamic range, until we can transmit HDR images to the GUI */
  64 #define DEPTH_AS_RGBA 0
  65
  66
  67 namespace glstate {
  68
  69
  70 struct ImageDesc
  71 {
  72     GLint width;
  73     GLint height;
  74     GLint depth;
  75     GLint internalFormat;
  76
  77     inline
  78     ImageDesc() :
  79         width(0),
  80         height(0),
  81         depth(0),
  82         internalFormat(GL_NONE)
  83     {}
  84
  85     inline bool
  86     valid(void) const {
  87         return width > 0 && height > 0 && depth > 0;
  88     }
  89 };
  90
  91
  92 /**
  93  * Sames as enumToString, but with special provision to handle formatsLUMINANCE_ALPHA.
  94  *
  95  * OpenGL 2.1 specification states that "internalFormat may (for backwards
  96  * compatibility with the 1.0 version of the GL) also take on the integer
  97  * values 1, 2, 3, and 4, which are equivalent to symbolic constants LUMINANCE,
  98  * LUMINANCE ALPHA, RGB, and RGBA respectively".
  99  */
 100 const char *
 101 formatToString(GLenum internalFormat) {
 102     switch (internalFormat) {
 103     case 1:
 104         return "GL_LUMINANCE";
 105     case 2:
 106         return "GL_LUMINANCE_ALPHA";
 107     case 3:
 108         return "GL_RGB";
 109     case 4:
 110         return "GL_RGBA";
 111     default:
 112         return enumToString(internalFormat);
 113     }
 114 }
 115
 116
 117 /**
 118  * OpenGL ES does not support glGetTexLevelParameteriv, but it is possible to
 119  * probe whether a texture has a given size by crafting a dummy glTexSubImage()
 120  * call.
 121  */
 122 static bool
 123 probeTextureLevelSizeOES(GLenum target, GLint level, const GLint size[3]) {
 124     while (glGetError() != GL_NO_ERROR)
 125         ;
 126
 127     GLenum internalFormat = GL_RGBA;
 128     GLenum type = GL_UNSIGNED_BYTE;
 129     GLint dummy = 0;
 130
 131     switch (target) {
 132     case GL_TEXTURE_2D:
 133     case GL_TEXTURE_CUBE_MAP:
 134     case GL_TEXTURE_CUBE_MAP_POSITIVE_X:
 135     case GL_TEXTURE_CUBE_MAP_NEGATIVE_X:
 136     case GL_TEXTURE_CUBE_MAP_POSITIVE_Y:
 137     case GL_TEXTURE_CUBE_MAP_NEGATIVE_Y:
 138     case GL_TEXTURE_CUBE_MAP_POSITIVE_Z:
 139     case GL_TEXTURE_CUBE_MAP_NEGATIVE_Z:
 140         glTexSubImage2D(target, level, size[0], size[1], 0, 0, internalFormat, type, &dummy);
 141         break;
 142     case GL_TEXTURE_3D_OES:
 143         glTexSubImage3DOES(target, level, size[0], size[1], size[2], 0, 0, 0, internalFormat, type, &dummy);
 144     default:
 145         assert(0);
 146         return false;
 147     }
 148
 149     GLenum error = glGetError();
 150
 151     if (0) {
 152         std::cerr << "(" << size[0] << ", " << size[1] << ", " << size[2] << ") = " << enumToString(error) << "\n";
 153     }
 154
 155     if (error == GL_NO_ERROR) {
 156         return true;
 157     }
 158
 159     while (glGetError() != GL_NO_ERROR)
 160         ;
 161
 162     return false;
 163 }
 164
 165
 166 /**
 167  * Bisect the texture size along an axis.
 168  *
 169  * It is assumed that the texture exists.
 170  */
 171 static GLint
 172 bisectTextureLevelSizeOES(GLenum target, GLint level, GLint axis, GLint max) {
 173     GLint size[3] = {0, 0, 0};
 174
 175     assert(axis < 3);
 176     assert(max >= 0);
 177
 178     GLint min = 0;
 179     while (true) {
 180         GLint test = (min + max) / 2;
 181         if (test == min) {
 182             return min;
 183         }
 184
 185         size[axis] = test;
 186
 187         if (probeTextureLevelSizeOES(target, level, size)) {
 188             min = test;
 189         } else {
 190             max = test;
 191         }
 192     }
 193 }
 194
 195
 196 /**
 197  * Special path to obtain texture size on OpenGL ES, that does not rely on
 198  * glGetTexLevelParameteriv
 199  */
 200 static bool
 201 getActiveTextureLevelDescOES(Context &context, GLenum target, GLint level, ImageDesc &desc)
 202 {
 203     if (target == GL_TEXTURE_1D) {
 204         // OpenGL ES does not support 1D textures
 205         return false;
 206     }
 207
 208     const GLint size[3] = {1, 1, 1};
 209     if (!probeTextureLevelSizeOES(target, level, size)) {
 210         return false;
 211     }
 212
 213     // XXX: mere guess
 214     desc.internalFormat = GL_RGBA;
 215
 216     GLint maxSize = 0;
 217     switch (target) {
 218     case GL_TEXTURE_2D:
 219         glGetIntegerv(GL_MAX_TEXTURE_SIZE, &maxSize);
 220         desc.width = bisectTextureLevelSizeOES(target, level, 0, maxSize);
 221         desc.height = bisectTextureLevelSizeOES(target, level, 1, maxSize);
 222         desc.depth = 1;
 223         break;
 224     case GL_TEXTURE_CUBE_MAP:
 225     case GL_TEXTURE_CUBE_MAP_POSITIVE_X:
 226     case GL_TEXTURE_CUBE_MAP_NEGATIVE_X:
 227     case GL_TEXTURE_CUBE_MAP_POSITIVE_Y:
 228     case GL_TEXTURE_CUBE_MAP_NEGATIVE_Y:
 229     case GL_TEXTURE_CUBE_MAP_POSITIVE_Z:
 230     case GL_TEXTURE_CUBE_MAP_NEGATIVE_Z:
 231         glGetIntegerv(GL_MAX_CUBE_MAP_TEXTURE_SIZE, &maxSize);
 232         desc.width = bisectTextureLevelSizeOES(target, level, 0, maxSize);
 233         desc.height = desc.width;
 234         desc.depth = 1;
 235         break;
 236     case GL_TEXTURE_3D_OES:
 237         glGetIntegerv(GL_MAX_3D_TEXTURE_SIZE_OES, &maxSize);
 238         desc.width = bisectTextureLevelSizeOES(target, level, 0, maxSize);
 239         desc.width = bisectTextureLevelSizeOES(target, level, 1, maxSize);
 240         desc.depth = bisectTextureLevelSizeOES(target, level, 2, maxSize);
 241         break;
 242     default:
 243         return false;
 244     }
 245
 246     if (0) {
 247         std::cerr
 248             << enumToString(target) << " "
 249             << level << " "
 250             << desc.width << "x" << desc.height << "x" << desc.depth
 251             << "\n";
 252     }
 253
 254     return desc.valid();
 255 }
 256
 257
 258 static inline bool
 259 getActiveTextureLevelDesc(Context &context, GLenum target, GLint level, ImageDesc &desc)
 260 {
 261     assert(target != GL_TEXTURE_CUBE_MAP);
 262
 263     if (context.ES) {
 264         return getActiveTextureLevelDescOES(context, target, level, desc);
 265     }
 266
 267     glGetTexLevelParameteriv(target, level, GL_TEXTURE_INTERNAL_FORMAT, &desc.internalFormat);
 268
 269     desc.width = 0;
 270     glGetTexLevelParameteriv(target, level, GL_TEXTURE_WIDTH, &desc.width);
 271
 272     if (target == GL_TEXTURE_1D) {
 273         desc.height = 1;
 274         desc.depth = 1;
 275     } else {
 276         desc.height = 0;
 277         glGetTexLevelParameteriv(target, level, GL_TEXTURE_HEIGHT, &desc.height);
 278         if (target != GL_TEXTURE_3D) {
 279             desc.depth = 1;
 280         } else {
 281             desc.depth = 0;
 282             glGetTexLevelParameteriv(target, level, GL_TEXTURE_DEPTH, &desc.depth);
 283         }
 284     }
 285
 286     return desc.valid();
 287 }
 288
 289
 290 static GLenum
 291 getTextureBinding(GLenum target)
 292 {
 293     switch (target) {
 294     case GL_TEXTURE_1D:
 295         return GL_TEXTURE_BINDING_1D;
 296     case GL_TEXTURE_1D_ARRAY:
 297         return GL_TEXTURE_BINDING_1D_ARRAY;
 298     case GL_TEXTURE_2D:
 299         return GL_TEXTURE_BINDING_2D;
 300     case GL_TEXTURE_2D_MULTISAMPLE:
 301         return GL_TEXTURE_BINDING_2D_MULTISAMPLE;
 302     case GL_TEXTURE_2D_ARRAY:
 303         return GL_TEXTURE_BINDING_2D_ARRAY;
 304     case GL_TEXTURE_RECTANGLE:
 305         return GL_TEXTURE_BINDING_RECTANGLE;
 306     case GL_TEXTURE_CUBE_MAP:
 307     case GL_TEXTURE_CUBE_MAP_POSITIVE_X:
 308     case GL_TEXTURE_CUBE_MAP_NEGATIVE_X:
 309     case GL_TEXTURE_CUBE_MAP_POSITIVE_Y:
 310     case GL_TEXTURE_CUBE_MAP_NEGATIVE_Y:
 311     case GL_TEXTURE_CUBE_MAP_POSITIVE_Z:
 312     case GL_TEXTURE_CUBE_MAP_NEGATIVE_Z:
 313         return GL_TEXTURE_BINDING_CUBE_MAP;
 314     case GL_TEXTURE_CUBE_MAP_ARRAY:
 315         return GL_TEXTURE_BINDING_CUBE_MAP_ARRAY;
 316     case GL_TEXTURE_3D:
 317         return GL_TEXTURE_BINDING_3D;
 318     default:
 319         assert(false);
 320         return GL_NONE;
 321     }
 322 }
 323
 324
 325 /**
 326  * OpenGL ES does not support glGetTexImage. Obtain the pixels by attaching the
 327  * texture to a framebuffer.
 328  */
 329 static inline void
 330 getTexImageOES(GLenum target, GLint level, ImageDesc &desc, GLubyte *pixels)
 331 {
 332     memset(pixels, 0x80, desc.height * desc.width * 4);
 333
 334     GLenum texture_binding = getTextureBinding(target);
 335     if (texture_binding == GL_NONE) {
 336         return;
 337     }
 338
 339     GLint texture = 0;
 340     glGetIntegerv(texture_binding, &texture);
 341     if (!texture) {
 342         return;
 343     }
 344
 345     GLint prev_fbo = 0;
 346     GLuint fbo = 0;
 347     glGetIntegerv(GL_FRAMEBUFFER_BINDING, &prev_fbo);
 348     glGenFramebuffers(1, &fbo);
 349     glBindFramebuffer(GL_FRAMEBUFFER, fbo);
 350
 351     GLenum status;
 352
 353     switch (target) {
 354     case GL_TEXTURE_2D:
 355     case GL_TEXTURE_CUBE_MAP_POSITIVE_X:
 356     case GL_TEXTURE_CUBE_MAP_NEGATIVE_X:
 357     case GL_TEXTURE_CUBE_MAP_POSITIVE_Y:
 358     case GL_TEXTURE_CUBE_MAP_NEGATIVE_Y:
 359     case GL_TEXTURE_CUBE_MAP_POSITIVE_Z:
 360     case GL_TEXTURE_CUBE_MAP_NEGATIVE_Z:
 361         glFramebufferTexture2D(GL_FRAMEBUFFER, GL_COLOR_ATTACHMENT0, GL_TEXTURE_2D, texture, level);
 362         status = glCheckFramebufferStatus(GL_FRAMEBUFFER);
 363         if (status != GL_FRAMEBUFFER_COMPLETE) {
 364             std::cerr << __FUNCTION__ << ": " << enumToString(status) << "\n";
 365         }
 366         glReadPixels(0, 0, desc.width, desc.height, GL_RGBA, GL_UNSIGNED_BYTE, pixels);
 367         break;
 368     case GL_TEXTURE_3D_OES:
 369         for (int i = 0; i < desc.depth; i++) {
 370             glFramebufferTexture3D(GL_FRAMEBUFFER, GL_COLOR_ATTACHMENT0, GL_TEXTURE_3D, texture, level, i);
 371             glReadPixels(0, 0, desc.width, desc.height, GL_RGBA, GL_UNSIGNED_BYTE, pixels + 4 * i * desc.width * desc.height);
 372         }
 373         break;
 374     }
 375
 376     glBindFramebuffer(GL_FRAMEBUFFER, prev_fbo);
 377
 378     glDeleteFramebuffers(1, &fbo);
 379 }
 380
 381
 382 static inline GLboolean
 383 isDepthFormat(GLenum internalFormat)
 384 {
 385    switch (internalFormat) {
 386    case GL_DEPTH_COMPONENT:
 387    case GL_DEPTH_COMPONENT16:
 388    case GL_DEPTH_COMPONENT24:
 389    case GL_DEPTH_COMPONENT32:
 390    case GL_DEPTH_COMPONENT32F:
 391    case GL_DEPTH_COMPONENT32F_NV:
 392    case GL_DEPTH_STENCIL:
 393    case GL_DEPTH24_STENCIL8:
 394    case GL_DEPTH32F_STENCIL8:
 395    case GL_DEPTH32F_STENCIL8_NV:
 396       return GL_TRUE;
 397    }
 398    return GL_FALSE;
 399 }
 400
 401
 402 static inline void
 403 dumpActiveTextureLevel(JSONWriter &json, Context &context, GLenum target, GLint level)
 404 {
 405     ImageDesc desc;
 406     if (!getActiveTextureLevelDesc(context, target, level, desc)) {
 407         return;
 408     }
 409
 410     char label[512];
 411     GLint active_texture = GL_TEXTURE0;
 412     glGetIntegerv(GL_ACTIVE_TEXTURE, &active_texture);
 413     snprintf(label, sizeof label, "%s, %s, level = %d",
 414              enumToString(active_texture), enumToString(target), level);
 415
 416     json.beginMember(label);
 417
 418     GLuint channels;
 419     GLenum format;
 420     if (!context.ES && isDepthFormat(desc.internalFormat)) {
 421        format = GL_DEPTH_COMPONENT;
 422        channels = 1;
 423     } else {
 424        format = GL_RGBA;
 425        channels = 4;
 426     }
 427
 428     image::Image *image = new image::Image(desc.width, desc.height*desc.depth, channels, true);
 429
 430     context.resetPixelPackState();
 431
 432     if (context.ES) {
 433         getTexImageOES(target, level, desc, image->pixels);
 434     } else {
 435         glGetTexImage(target, level, format, GL_UNSIGNED_BYTE, image->pixels);
 436     }
 437
 438     context.restorePixelPackState();
 439
 440     json.writeImage(image, formatToString(desc.internalFormat), desc.depth);
 441
 442     delete image;
 443
 444     json.endMember(); // label
 445 }
 446
 447
 448 static inline void
 449 dumpTexture(JSONWriter &json, Context &context, GLenum target, GLenum binding)
 450 {
 451     GLint texture_binding = 0;
 452     glGetIntegerv(binding, &texture_binding);
 453     if (!glIsEnabled(target) && !texture_binding) {
 454         return;
 455     }
 456
 457     GLint level = 0;
 458     do {
 459         ImageDesc desc;
 460
 461         if (target == GL_TEXTURE_CUBE_MAP) {
 462             for (int face = 0; face < 6; ++face) {
 463                 if (!getActiveTextureLevelDesc(context, GL_TEXTURE_CUBE_MAP_POSITIVE_X + face, level, desc)) {
 464                     return;
 465                 }
 466                 dumpActiveTextureLevel(json, context, GL_TEXTURE_CUBE_MAP_POSITIVE_X + face, level);
 467             }
 468         } else {
 469             if (!getActiveTextureLevelDesc(context, target, level, desc)) {
 470                 return;
 471             }
 472             dumpActiveTextureLevel(json, context, target, level);
 473         }
 474
 475         ++level;
 476     } while(true);
 477 }
 478
 479
 480 void
 481 dumpTextures(JSONWriter &json, Context &context)
 482 {
 483     json.beginMember("textures");
 484     json.beginObject();
 485     GLint active_texture = GL_TEXTURE0;
 486     glGetIntegerv(GL_ACTIVE_TEXTURE, &active_texture);
 487
 488     GLint max_texture_coords = 0;
 489     glGetIntegerv(GL_MAX_TEXTURE_COORDS, &max_texture_coords);
 490     GLint max_combined_texture_image_units = 0;
 491     glGetIntegerv(GL_MAX_COMBINED_TEXTURE_IMAGE_UNITS, &max_combined_texture_image_units);
 492     GLint max_units = std::max(max_combined_texture_image_units, max_texture_coords);
 493
 494     /*
 495      * At least the Android software GL implementation doesn't return the
 496      * proper value for this, but rather returns 0. The GL(ES) specification
 497      * mandates a minimum value of 2, so use this as a fall-back value.
 498      */
 499     max_units = std::max(max_units, 2);
 500
 501     for (GLint unit = 0; unit < max_units; ++unit) {
 502         GLenum texture = GL_TEXTURE0 + unit;
 503         glActiveTexture(texture);
 504         dumpTexture(json, context, GL_TEXTURE_1D, GL_TEXTURE_BINDING_1D);
 505         dumpTexture(json, context, GL_TEXTURE_2D, GL_TEXTURE_BINDING_2D);
 506         dumpTexture(json, context, GL_TEXTURE_3D, GL_TEXTURE_BINDING_3D);
 507         dumpTexture(json, context, GL_TEXTURE_RECTANGLE, GL_TEXTURE_BINDING_RECTANGLE);
 508         dumpTexture(json, context, GL_TEXTURE_CUBE_MAP, GL_TEXTURE_BINDING_CUBE_MAP);
 509     }
 510     glActiveTexture(active_texture);
 511     json.endObject();
 512     json.endMember(); // textures
 513 }
 514
 515
 516 static bool
 517 getDrawableBounds(GLint *width, GLint *height) {
 518 #if defined(__linux__)
 519     if (dlsym(RTLD_DEFAULT, "eglGetCurrentContext")) {
 520         EGLContext currentContext = eglGetCurrentContext();
 521         if (currentContext != EGL_NO_CONTEXT) {
 522             EGLSurface currentSurface = eglGetCurrentSurface(EGL_DRAW);
 523             if (currentSurface == EGL_NO_SURFACE) {
 524                 return false;
 525             }
 526
 527             EGLDisplay currentDisplay = eglGetCurrentDisplay();
 528             if (currentDisplay == EGL_NO_DISPLAY) {
 529                 return false;
 530             }
 531
 532             if (!eglQuerySurface(currentDisplay, currentSurface, EGL_WIDTH, width) ||
 533                 !eglQuerySurface(currentDisplay, currentSurface, EGL_HEIGHT, height)) {
 534                 return false;
 535             }
 536
 537             return true;
 538         }
 539     }
 540 #endif
 541
 542 #if defined(_WIN32)
 543
 544     HDC hDC = wglGetCurrentDC();
 545     if (!hDC) {
 546         return false;
 547     }
 548
 549     HWND hWnd = WindowFromDC(hDC);
 550     RECT rect;
 551
 552     if (!GetClientRect(hWnd, &rect)) {
 553        return false;
 554     }
 555
 556     *width  = rect.right  - rect.left;
 557     *height = rect.bottom - rect.top;
 558     return true;
 559
 560 #elif defined(__APPLE__)
 561
 562     CGLContextObj ctx = CGLGetCurrentContext();
 563     if (ctx == NULL) {
 564         return false;
 565     }
 566
 567     CGSConnectionID cid;
 568     CGSWindowID wid;
 569     CGSSurfaceID sid;
 570
 571     if (CGLGetSurface(ctx, &cid, &wid, &sid) != kCGLNoError) {
 572         return false;
 573     }
 574
 575     CGRect rect;
 576
 577     if (CGSGetSurfaceBounds(cid, wid, sid, &rect) != 0) {
 578         return false;
 579     }
 580
 581     *width = rect.size.width;
 582     *height = rect.size.height;
 583     return true;
 584
 585 #elif defined(HAVE_X11)
 586
 587     Display *display;
 588     Drawable drawable;
 589     Window root;
 590     int x, y;
 591     unsigned int w, h, bw, depth;
 592
 593     display = glXGetCurrentDisplay();
 594     if (!display) {
 595         return false;
 596     }
 597
 598     drawable = glXGetCurrentDrawable();
 599     if (drawable == None) {
 600         return false;
 601     }
 602
 603     if (!XGetGeometry(display, drawable, &root, &x, &y, &w, &h, &bw, &depth)) {
 604         return false;
 605     }
 606
 607     *width = w;
 608     *height = h;
 609     return true;
 610
 611 #else
 612
 613     return false;
 614
 615 #endif
 616 }
 617
 618
 619 struct TextureTargetBinding
 620 {
 621     GLenum target;
 622     GLenum binding;
 623 };
 624
 625
 626 static const GLenum
 627 textureTargets[] = {
 628     GL_TEXTURE_1D,
 629     GL_TEXTURE_2D,
 630     GL_TEXTURE_RECTANGLE,
 631     GL_TEXTURE_CUBE_MAP,
 632     GL_TEXTURE_3D,
 633     GL_TEXTURE_2D_MULTISAMPLE,
 634     GL_TEXTURE_1D_ARRAY,
 635     GL_TEXTURE_2D_ARRAY,
 636     GL_TEXTURE_CUBE_MAP_ARRAY,
 637 };
 638
 639
 640 static GLenum
 641 getTextureTarget(GLint texture)
 642 {
 643     if (!glIsTexture(texture)) {
 644         return GL_NONE;
 645     }
 646
 647     for (unsigned i = 0; i < sizeof(textureTargets)/sizeof(textureTargets[0]); ++i) {
 648         GLenum target = textureTargets[i];
 649         GLenum binding = getTextureBinding(target);
 650
 651         while (glGetError() != GL_NO_ERROR)
 652             ;
 653
 654         GLint bound_texture = 0;
 655         glGetIntegerv(binding, &bound_texture);
 656         glBindTexture(target, texture);
 657
 658         bool succeeded = glGetError() == GL_NO_ERROR;
 659
 660         glBindTexture(target, bound_texture);
 661
 662         if (succeeded) {
 663             return target;
 664         }
 665     }
 666
 667     return GL_NONE;
 668 }
 669
 670
 671 static bool
 672 getBoundRenderbufferDesc(Context &context, ImageDesc &desc)
 673 {
 674     glGetRenderbufferParameteriv(GL_RENDERBUFFER, GL_RENDERBUFFER_WIDTH, &desc.width);
 675     glGetRenderbufferParameteriv(GL_RENDERBUFFER, GL_RENDERBUFFER_HEIGHT, &desc.height);
 676     desc.depth = 1;
 677
 678     glGetRenderbufferParameteriv(GL_RENDERBUFFER, GL_RENDERBUFFER_INTERNAL_FORMAT, &desc.internalFormat);
 679
 680     return desc.valid();
 681 }
 682
 683
 684 static bool
 685 getRenderbufferDesc(Context &context, GLint renderbuffer, ImageDesc &desc)
 686 {
 687     GLint bound_renderbuffer = 0;
 688     glGetIntegerv(GL_RENDERBUFFER_BINDING, &bound_renderbuffer);
 689     glBindRenderbuffer(GL_RENDERBUFFER, renderbuffer);
 690
 691     getBoundRenderbufferDesc(context, desc);
 692
 693     glBindRenderbuffer(GL_RENDERBUFFER, bound_renderbuffer);
 694
 695     return desc.valid();
 696 }
 697
 698
 699 static bool
 700 getFramebufferAttachmentDesc(Context &context, GLenum target, GLenum attachment, ImageDesc &desc)
 701 {
 702     GLint object_type = GL_NONE;
 703     glGetFramebufferAttachmentParameteriv(target, attachment,
 704                                           GL_FRAMEBUFFER_ATTACHMENT_OBJECT_TYPE,
 705                                           &object_type);
 706     if (object_type == GL_NONE) {
 707         return false;
 708     }
 709
 710     GLint object_name = 0;
 711     glGetFramebufferAttachmentParameteriv(target, attachment,
 712                                           GL_FRAMEBUFFER_ATTACHMENT_OBJECT_NAME,
 713                                           &object_name);
 714     if (object_name == 0) {
 715         return false;
 716     }
 717
 718     if (object_type == GL_RENDERBUFFER) {
 719         return getRenderbufferDesc(context, object_name, desc);
 720     } else if (object_type == GL_TEXTURE) {
 721         GLint texture_face = 0;
 722         glGetFramebufferAttachmentParameteriv(target, attachment,
 723                                               GL_FRAMEBUFFER_ATTACHMENT_TEXTURE_CUBE_MAP_FACE,
 724                                               &texture_face);
 725
 726         GLint texture_level = 0;
 727         glGetFramebufferAttachmentParameteriv(target, attachment,
 728                                               GL_FRAMEBUFFER_ATTACHMENT_TEXTURE_LEVEL,
 729                                               &texture_level);
 730
 731         GLint bound_texture = 0;
 732         if (texture_face != 0) {
 733             glGetIntegerv(GL_TEXTURE_BINDING_CUBE_MAP, &bound_texture);
 734             glBindTexture(GL_TEXTURE_CUBE_MAP, object_name);
 735             getActiveTextureLevelDesc(context, texture_face, texture_level, desc);
 736             glBindTexture(GL_TEXTURE_CUBE_MAP, bound_texture);
 737         } else {
 738             GLenum texture_target = getTextureTarget(object_name);
 739             GLenum texture_binding = getTextureBinding(texture_target);
 740             glGetIntegerv(texture_binding, &bound_texture);
 741             glBindTexture(texture_target, object_name);
 742             getActiveTextureLevelDesc(context, texture_target, texture_level, desc);
 743             glBindTexture(texture_target, bound_texture);
 744         }
 745
 746         return desc.valid();
 747     } else {
 748         std::cerr << "warning: unexpected GL_FRAMEBUFFER_ATTACHMENT_OBJECT_TYPE = " << object_type << "\n";
 749         return false;
 750     }
 751 }
 752
 753
 754
 755 image::Image *
 756 getDrawBufferImage() {
 757     GLenum format = GL_RGB;
 758     GLint channels = _gl_format_channels(format);
 759     if (channels > 4) {
 760         return NULL;
 761     }
 762
 763     Context context;
 764
 765     GLenum framebuffer_binding;
 766     GLenum framebuffer_target;
 767     if (context.ES) {
 768         framebuffer_binding = GL_FRAMEBUFFER_BINDING;
 769         framebuffer_target = GL_FRAMEBUFFER;
 770     } else {
 771         framebuffer_binding = GL_DRAW_FRAMEBUFFER_BINDING;
 772         framebuffer_target = GL_DRAW_FRAMEBUFFER;
 773     }
 774
 775     GLint draw_framebuffer = 0;
 776     glGetIntegerv(framebuffer_binding, &draw_framebuffer);
 777
 778     GLint draw_buffer = GL_NONE;
 779     ImageDesc desc;
 780     if (draw_framebuffer) {
 781         if (context.ARB_draw_buffers) {
 782             glGetIntegerv(GL_DRAW_BUFFER0, &draw_buffer);
 783             if (draw_buffer == GL_NONE) {
 784                 return NULL;
 785             }
 786         } else {
 787             // GL_COLOR_ATTACHMENT0 is implied
 788             draw_buffer = GL_COLOR_ATTACHMENT0;
 789         }
 790
 791         if (!getFramebufferAttachmentDesc(context, framebuffer_target, draw_buffer, desc)) {
 792             return NULL;
 793         }
 794     } else {
 795         if (context.ES) {
 796             // XXX: Draw buffer is always FRONT for single buffer context, BACK
 797             // for double buffered contexts. There is no way to know which (as
 798             // GL_DOUBLEBUFFER state is also unavailable), so always assume
 799             // double-buffering.
 800             draw_buffer = GL_BACK;
 801         } else {
 802             glGetIntegerv(GL_DRAW_BUFFER, &draw_buffer);
 803             if (draw_buffer == GL_NONE) {
 804                 return NULL;
 805             }
 806         }
 807
 808         if (!getDrawableBounds(&desc.width, &desc.height)) {
 809             return NULL;
 810         }
 811
 812         desc.depth = 1;
 813     }
 814
 815     GLenum type = GL_UNSIGNED_BYTE;
 816
 817 #if DEPTH_AS_RGBA
 818     if (format == GL_DEPTH_COMPONENT) {
 819         type = GL_UNSIGNED_INT;
 820         channels = 4;
 821     }
 822 #endif
 823
 824     image::Image *image = new image::Image(desc.width, desc.height, channels, true);
 825     if (!image) {
 826         return NULL;
 827     }
 828
 829     while (glGetError() != GL_NO_ERROR) {}
 830
 831     GLint read_framebuffer = 0;
 832     GLint read_buffer = GL_NONE;
 833     if (!context.ES) {
 834         glGetIntegerv(GL_READ_FRAMEBUFFER_BINDING, &read_framebuffer);
 835         glBindFramebuffer(GL_READ_FRAMEBUFFER, draw_framebuffer);
 836
 837         glGetIntegerv(GL_READ_BUFFER, &read_buffer);
 838         glReadBuffer(draw_buffer);
 839     }
 840
 841     // TODO: reset imaging state too
 842     context.resetPixelPackState();
 843
 844     glReadPixels(0, 0, desc.width, desc.height, format, type, image->pixels);
 845
 846     context.restorePixelPackState();
 847
 848     if (!context.ES) {
 849         glReadBuffer(read_buffer);
 850         glBindFramebuffer(GL_READ_FRAMEBUFFER, read_framebuffer);
 851     }
 852
 853     GLenum error = glGetError();
 854     if (error != GL_NO_ERROR) {
 855         do {
 856             std::cerr << "warning: " << enumToString(error) << " while getting snapshot\n";
 857             error = glGetError();
 858         } while(error != GL_NO_ERROR);
 859         delete image;
 860         return NULL;
 861     }
 862
 863     return image;
 864 }
 865
 866
 867 /**
 868  * Dump the image of the currently bound read buffer.
 869  */
 870 static inline void
 871 dumpReadBufferImage(JSONWriter &json, GLint width, GLint height, GLenum format,
 872                     GLint internalFormat = GL_NONE)
 873 {
 874     GLint channels = _gl_format_channels(format);
 875
 876     if (internalFormat == GL_NONE) {
 877         internalFormat = format;
 878     }
 879
 880     Context context;
 881
 882     GLenum type = GL_UNSIGNED_BYTE;
 883
 884 #if DEPTH_AS_RGBA
 885     if (format == GL_DEPTH_COMPONENT) {
 886         type = GL_UNSIGNED_INT;
 887         channels = 4;
 888     }
 889 #endif
 890
 891     image::Image *image = new image::Image(width, height, channels, true);
 892
 893     while (glGetError() != GL_NO_ERROR) {}
 894
 895     // TODO: reset imaging state too
 896     context.resetPixelPackState();
 897
 898     glReadPixels(0, 0, width, height, format, type, image->pixels);
 899
 900     context.restorePixelPackState();
 901
 902     GLenum error = glGetError();
 903     if (error != GL_NO_ERROR) {
 904         do {
 905             std::cerr << "warning: " << enumToString(error) << " while reading framebuffer\n";
 906             error = glGetError();
 907         } while(error != GL_NO_ERROR);
 908         json.writeNull();
 909     } else {
 910         json.writeImage(image, formatToString(internalFormat));
 911     }
 912
 913     delete image;
 914 }
 915
 916
 917 static inline GLuint
 918 downsampledFramebuffer(Context &context,
 919                        GLuint oldFbo, GLint drawbuffer,
 920                        GLint colorRb, GLint depthRb, GLint stencilRb,
 921                        GLuint *rbs, GLint *numRbs)
 922 {
 923     GLuint fbo;
 924
 925
 926     *numRbs = 0;
 927
 928     glGenFramebuffers(1, &fbo);
 929     glBindFramebuffer(GL_FRAMEBUFFER, fbo);
 930
 931     {
 932         // color buffer
 933         ImageDesc desc;
 934         glBindRenderbuffer(GL_RENDERBUFFER, colorRb);
 935         getBoundRenderbufferDesc(context, desc);
 936
 937         glGenRenderbuffers(1, &rbs[*numRbs]);
 938         glBindRenderbuffer(GL_RENDERBUFFER, rbs[*numRbs]);
 939         glRenderbufferStorage(GL_RENDERBUFFER, desc.internalFormat, desc.width, desc.height);
 940         glFramebufferRenderbuffer(GL_FRAMEBUFFER, drawbuffer,
 941                                   GL_RENDERBUFFER, rbs[*numRbs]);
 942
 943         glBindFramebuffer(GL_READ_FRAMEBUFFER, oldFbo);
 944         glBindFramebuffer(GL_DRAW_FRAMEBUFFER, fbo);
 945         glDrawBuffer(drawbuffer);
 946         glReadBuffer(drawbuffer);
 947         glBlitFramebuffer(0, 0, desc.width, desc.height, 0, 0, desc.width, desc.height,
 948                           GL_COLOR_BUFFER_BIT, GL_NEAREST);
 949         glBindFramebuffer(GL_FRAMEBUFFER, fbo);
 950         ++*numRbs;
 951     }
 952
 953     if (stencilRb == depthRb && stencilRb) {
 954         //combined depth and stencil buffer
 955         ImageDesc desc;
 956         glBindRenderbuffer(GL_RENDERBUFFER, depthRb);
 957         getBoundRenderbufferDesc(context, desc);
 958
 959         glGenRenderbuffers(1, &rbs[*numRbs]);
 960         glBindRenderbuffer(GL_RENDERBUFFER, rbs[*numRbs]);
 961         glRenderbufferStorage(GL_RENDERBUFFER, desc.internalFormat, desc.width, desc.height);
 962         glFramebufferRenderbuffer(GL_FRAMEBUFFER, GL_DEPTH_STENCIL_ATTACHMENT,
 963                                   GL_RENDERBUFFER, rbs[*numRbs]);
 964         glBindFramebuffer(GL_READ_FRAMEBUFFER, oldFbo);
 965         glBindFramebuffer(GL_DRAW_FRAMEBUFFER, fbo);
 966         glBlitFramebuffer(0, 0, desc.width, desc.height, 0, 0, desc.width, desc.height,
 967                           GL_DEPTH_BUFFER_BIT | GL_STENCIL_BUFFER_BIT, GL_NEAREST);
 968         glBindFramebuffer(GL_FRAMEBUFFER, fbo);
 969         ++*numRbs;
 970     } else {
 971         if (depthRb) {
 972             ImageDesc desc;
 973             glBindRenderbuffer(GL_RENDERBUFFER, depthRb);
 974             getBoundRenderbufferDesc(context, desc);
 975
 976             glGenRenderbuffers(1, &rbs[*numRbs]);
 977             glBindRenderbuffer(GL_RENDERBUFFER, rbs[*numRbs]);
 978             glRenderbufferStorage(GL_RENDERBUFFER, desc.internalFormat, desc.width, desc.height);
 979             glFramebufferRenderbuffer(GL_FRAMEBUFFER,
 980                                       GL_DEPTH_ATTACHMENT,
 981                                       GL_RENDERBUFFER, rbs[*numRbs]);
 982             glBindFramebuffer(GL_READ_FRAMEBUFFER, oldFbo);
 983             glBindFramebuffer(GL_DRAW_FRAMEBUFFER, fbo);
 984             glDrawBuffer(GL_DEPTH_ATTACHMENT);
 985             glReadBuffer(GL_DEPTH_ATTACHMENT);
 986             glBlitFramebuffer(0, 0, desc.width, desc.height, 0, 0, desc.width, desc.height,
 987                               GL_DEPTH_BUFFER_BIT, GL_NEAREST);
 988             ++*numRbs;
 989         }
 990         if (stencilRb) {
 991             ImageDesc desc;
 992             glBindRenderbuffer(GL_RENDERBUFFER, stencilRb);
 993             getBoundRenderbufferDesc(context, desc);
 994
 995             glGenRenderbuffers(1, &rbs[*numRbs]);
 996             glBindRenderbuffer(GL_RENDERBUFFER, rbs[*numRbs]);
 997             glRenderbufferStorage(GL_RENDERBUFFER, desc.internalFormat, desc.width, desc.height);
 998             glFramebufferRenderbuffer(GL_FRAMEBUFFER,
 999                                       GL_STENCIL_ATTACHMENT,
1000                                       GL_RENDERBUFFER, rbs[*numRbs]);
1001             glBindFramebuffer(GL_READ_FRAMEBUFFER, oldFbo);
1002             glBindFramebuffer(GL_DRAW_FRAMEBUFFER, fbo);
1003             glDrawBuffer(GL_STENCIL_ATTACHMENT);
1004             glReadBuffer(GL_STENCIL_ATTACHMENT);
1005             glBlitFramebuffer(0, 0, desc.width, desc.height, 0, 0, desc.width, desc.height,
1006                               GL_STENCIL_BUFFER_BIT, GL_NEAREST);
1007             ++*numRbs;
1008         }
1009     }
1010
1011     return fbo;
1012 }
1013
1014
1015 /**
1016  * Dump images of current draw drawable/window.
1017  */
1018 static void
1019 dumpDrawableImages(JSONWriter &json, Context &context)
1020 {
1021     GLint width, height;
1022
1023     if (!getDrawableBounds(&width, &height)) {
1024         return;
1025     }
1026
1027     GLint draw_buffer = GL_NONE;
1028     if (context.ES) {
1029         // XXX: Draw buffer is always FRONT for single buffer context, BACK for
1030         // double buffered contexts. There is no way to know which (as
1031         // GL_DOUBLEBUFFER state is also unavailable), so always assume
1032         // double-buffering.
1033         draw_buffer = GL_BACK;
1034     } else {
1035         glGetIntegerv(GL_DRAW_BUFFER, &draw_buffer);
1036     }
1037
1038     if (draw_buffer != GL_NONE) {
1039         // Read from current draw buffer
1040         GLint read_buffer = GL_NONE;
1041         if (!context.ES) {
1042             glGetIntegerv(GL_READ_BUFFER, &read_buffer);
1043             glReadBuffer(draw_buffer);
1044         }
1045
1046         GLint alpha_bits = 0;
1047 #if 0
1048         // XXX: Ignore alpha until we are able to match the traced visual
1049         glGetIntegerv(GL_ALPHA_BITS, &alpha_bits);
1050 #endif
1051         GLenum format = alpha_bits ? GL_RGBA : GL_RGB;
1052         json.beginMember(enumToString(draw_buffer));
1053         dumpReadBufferImage(json, width, height, format);
1054         json.endMember();
1055
1056         // Restore original read buffer
1057         if (!context.ES) {
1058             glReadBuffer(read_buffer);
1059         }
1060     }
1061
1062     if (!context.ES) {
1063         GLint depth_bits = 0;
1064         glGetIntegerv(GL_DEPTH_BITS, &depth_bits);
1065         if (depth_bits) {
1066             json.beginMember("GL_DEPTH_COMPONENT");
1067             dumpReadBufferImage(json, width, height, GL_DEPTH_COMPONENT);
1068             json.endMember();
1069         }
1070
1071         GLint stencil_bits = 0;
1072         glGetIntegerv(GL_STENCIL_BITS, &stencil_bits);
1073         if (stencil_bits) {
1074             json.beginMember("GL_STENCIL_INDEX");
1075             dumpReadBufferImage(json, width, height, GL_STENCIL_INDEX);
1076             json.endMember();
1077         }
1078     }
1079 }
1080
1081
1082 /**
1083  * Dump the specified framebuffer attachment.
1084  *
1085  * In the case of a color attachment, it assumes it is already bound for read.
1086  */
1087 static void
1088 dumpFramebufferAttachment(JSONWriter &json, Context &context, GLenum target, GLenum attachment, GLenum format)
1089 {
1090     ImageDesc desc;
1091     if (!getFramebufferAttachmentDesc(context, target, attachment, desc)) {
1092         return;
1093     }
1094
1095     json.beginMember(enumToString(attachment));
1096     dumpReadBufferImage(json, desc.width, desc.height, format, desc.internalFormat);
1097     json.endMember();
1098 }
1099
1100
1101 static void
1102 dumpFramebufferAttachments(JSONWriter &json, Context &context, GLenum target)
1103 {
1104     GLint read_framebuffer = 0;
1105     glGetIntegerv(GL_READ_FRAMEBUFFER_BINDING, &read_framebuffer);
1106
1107     GLint read_buffer = GL_NONE;
1108     glGetIntegerv(GL_READ_BUFFER, &read_buffer);
1109
1110     GLint max_draw_buffers = 1;
1111     glGetIntegerv(GL_MAX_DRAW_BUFFERS, &max_draw_buffers);
1112     GLint max_color_attachments = 0;
1113     glGetIntegerv(GL_MAX_COLOR_ATTACHMENTS, &max_color_attachments);
1114
1115     for (GLint i = 0; i < max_draw_buffers; ++i) {
1116         GLint draw_buffer = GL_NONE;
1117         glGetIntegerv(GL_DRAW_BUFFER0 + i, &draw_buffer);
1118         if (draw_buffer != GL_NONE) {
1119             glReadBuffer(draw_buffer);
1120             GLint attachment;
1121             if (draw_buffer >= GL_COLOR_ATTACHMENT0 && draw_buffer < GL_COLOR_ATTACHMENT0 + max_color_attachments) {
1122                 attachment = draw_buffer;
1123             } else {
1124                 std::cerr << "warning: unexpected GL_DRAW_BUFFER" << i << " = " << draw_buffer << "\n";
1125                 attachment = GL_COLOR_ATTACHMENT0;
1126             }
1127             GLint alpha_size = 0;
1128             glGetFramebufferAttachmentParameteriv(target, attachment,
1129                                                   GL_FRAMEBUFFER_ATTACHMENT_ALPHA_SIZE,
1130                                                   &alpha_size);
1131             GLenum format = alpha_size ? GL_RGBA : GL_RGB;
1132             dumpFramebufferAttachment(json, context, target, attachment, format);
1133         }
1134     }
1135
1136     glReadBuffer(read_buffer);
1137
1138     if (!context.ES) {
1139         dumpFramebufferAttachment(json, context, target, GL_DEPTH_ATTACHMENT, GL_DEPTH_COMPONENT);
1140         dumpFramebufferAttachment(json, context, target, GL_STENCIL_ATTACHMENT, GL_STENCIL_INDEX);
1141     }
1142
1143     glBindFramebuffer(GL_READ_FRAMEBUFFER, read_framebuffer);
1144 }
1145
1146
1147 void
1148 dumpFramebuffer(JSONWriter &json, Context &context)
1149 {
1150     json.beginMember("framebuffer");
1151     json.beginObject();
1152
1153     GLint boundDrawFbo = 0, boundReadFbo = 0;
1154     glGetIntegerv(GL_DRAW_FRAMEBUFFER_BINDING, &boundDrawFbo);
1155     glGetIntegerv(GL_READ_FRAMEBUFFER_BINDING, &boundReadFbo);
1156     if (!boundDrawFbo) {
1157         dumpDrawableImages(json, context);
1158     } else if (context.ES) {
1159         dumpFramebufferAttachments(json, context, GL_FRAMEBUFFER);
1160     } else {
1161         GLint colorRb = 0, stencilRb = 0, depthRb = 0;
1162         GLint draw_buffer0 = GL_NONE;
1163         glGetIntegerv(GL_DRAW_BUFFER0, &draw_buffer0);
1164         bool multisample = false;
1165
1166         GLint boundRb = 0;
1167         glGetIntegerv(GL_RENDERBUFFER_BINDING, &boundRb);
1168
1169         GLint object_type;
1170         glGetFramebufferAttachmentParameteriv(GL_DRAW_FRAMEBUFFER, draw_buffer0, GL_FRAMEBUFFER_ATTACHMENT_OBJECT_TYPE, &object_type);
1171         if (object_type == GL_RENDERBUFFER) {
1172             glGetFramebufferAttachmentParameteriv(GL_DRAW_FRAMEBUFFER, draw_buffer0, GL_FRAMEBUFFER_ATTACHMENT_OBJECT_NAME, &colorRb);
1173             glBindRenderbuffer(GL_RENDERBUFFER, colorRb);
1174             GLint samples = 0;
1175             glGetRenderbufferParameteriv(GL_RENDERBUFFER, GL_RENDERBUFFER_SAMPLES, &samples);
1176             if (samples) {
1177                 multisample = true;
1178             }
1179         }
1180
1181         glGetFramebufferAttachmentParameteriv(GL_DRAW_FRAMEBUFFER, GL_DEPTH_ATTACHMENT, GL_FRAMEBUFFER_ATTACHMENT_OBJECT_TYPE, &object_type);
1182         if (object_type == GL_RENDERBUFFER) {
1183             glGetFramebufferAttachmentParameteriv(GL_DRAW_FRAMEBUFFER, GL_DEPTH_ATTACHMENT, GL_FRAMEBUFFER_ATTACHMENT_OBJECT_NAME, &depthRb);
1184             glBindRenderbuffer(GL_RENDERBUFFER, depthRb);
1185             GLint samples = 0;
1186             glGetRenderbufferParameteriv(GL_RENDERBUFFER, GL_RENDERBUFFER_SAMPLES, &samples);
1187             if (samples) {
1188                 multisample = true;
1189             }
1190         }
1191
1192         glGetFramebufferAttachmentParameteriv(GL_DRAW_FRAMEBUFFER, GL_STENCIL_ATTACHMENT, GL_FRAMEBUFFER_ATTACHMENT_OBJECT_TYPE, &object_type);
1193         if (object_type == GL_RENDERBUFFER) {
1194             glGetFramebufferAttachmentParameteriv(GL_DRAW_FRAMEBUFFER, GL_STENCIL_ATTACHMENT, GL_FRAMEBUFFER_ATTACHMENT_OBJECT_NAME, &stencilRb);
1195             glBindRenderbuffer(GL_RENDERBUFFER, stencilRb);
1196             GLint samples = 0;
1197             glGetRenderbufferParameteriv(GL_RENDERBUFFER, GL_RENDERBUFFER_SAMPLES, &samples);
1198             if (samples) {
1199                 multisample = true;
1200             }
1201         }
1202
1203         glBindRenderbuffer(GL_RENDERBUFFER, boundRb);
1204
1205         GLuint rbs[3];
1206         GLint numRbs = 0;
1207         GLuint fboCopy = 0;
1208
1209         if (multisample) {
1210             // glReadPixels doesnt support multisampled buffers so we need
1211             // to blit the fbo to a temporary one
1212             fboCopy = downsampledFramebuffer(context,
1213                                              boundDrawFbo, draw_buffer0,
1214                                              colorRb, depthRb, stencilRb,
1215                                              rbs, &numRbs);
1216         }
1217
1218         dumpFramebufferAttachments(json, context, GL_DRAW_FRAMEBUFFER);
1219
1220         if (multisample) {
1221             glBindRenderbuffer(GL_RENDERBUFFER, boundRb);
1222             glDeleteRenderbuffers(numRbs, rbs);
1223             glDeleteFramebuffers(1, &fboCopy);
1224         }
1225
1226         glBindFramebuffer(GL_READ_FRAMEBUFFER, boundReadFbo);
1227         glBindFramebuffer(GL_DRAW_FRAMEBUFFER, boundDrawFbo);
1228     }
1229
1230     json.endObject();
1231     json.endMember(); // framebuffer
1232 }
1233
1234
1235 } /* namespace glstate */