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             return false;
 523         }
 524
 525         EGLSurface currentSurface = eglGetCurrentSurface(EGL_DRAW);
 526         if (currentSurface == EGL_NO_SURFACE) {
 527             return false;
 528         }
 529
 530         EGLDisplay currentDisplay = eglGetCurrentDisplay();
 531         if (currentDisplay == EGL_NO_DISPLAY) {
 532             return false;
 533         }
 534
 535         if (!eglQuerySurface(currentDisplay, currentSurface, EGL_WIDTH, width) ||
 536             !eglQuerySurface(currentDisplay, currentSurface, EGL_HEIGHT, height)) {
 537             return false;
 538         }
 539
 540         return true;
 541     }
 542 #endif
 543
 544 #if defined(_WIN32)
 545
 546     HDC hDC = wglGetCurrentDC();
 547     if (!hDC) {
 548         return false;
 549     }
 550
 551     HWND hWnd = WindowFromDC(hDC);
 552     RECT rect;
 553
 554     if (!GetClientRect(hWnd, &rect)) {
 555        return false;
 556     }
 557
 558     *width  = rect.right  - rect.left;
 559     *height = rect.bottom - rect.top;
 560     return true;
 561
 562 #elif defined(__APPLE__)
 563
 564     CGLContextObj ctx = CGLGetCurrentContext();
 565     if (ctx == NULL) {
 566         return false;
 567     }
 568
 569     CGSConnectionID cid;
 570     CGSWindowID wid;
 571     CGSSurfaceID sid;
 572
 573     if (CGLGetSurface(ctx, &cid, &wid, &sid) != kCGLNoError) {
 574         return false;
 575     }
 576
 577     CGRect rect;
 578
 579     if (CGSGetSurfaceBounds(cid, wid, sid, &rect) != 0) {
 580         return false;
 581     }
 582
 583     *width = rect.size.width;
 584     *height = rect.size.height;
 585     return true;
 586
 587 #elif defined(HAVE_X11)
 588
 589     Display *display;
 590     Drawable drawable;
 591     Window root;
 592     int x, y;
 593     unsigned int w, h, bw, depth;
 594
 595     display = glXGetCurrentDisplay();
 596     if (!display) {
 597         return false;
 598     }
 599
 600     drawable = glXGetCurrentDrawable();
 601     if (drawable == None) {
 602         return false;
 603     }
 604
 605     if (!XGetGeometry(display, drawable, &root, &x, &y, &w, &h, &bw, &depth)) {
 606         return false;
 607     }
 608
 609     *width = w;
 610     *height = h;
 611     return true;
 612
 613 #else
 614
 615     return false;
 616
 617 #endif
 618 }
 619
 620
 621 struct TextureTargetBinding
 622 {
 623     GLenum target;
 624     GLenum binding;
 625 };
 626
 627
 628 static const GLenum
 629 textureTargets[] = {
 630     GL_TEXTURE_1D,
 631     GL_TEXTURE_2D,
 632     GL_TEXTURE_RECTANGLE,
 633     GL_TEXTURE_CUBE_MAP,
 634     GL_TEXTURE_3D,
 635     GL_TEXTURE_2D_MULTISAMPLE,
 636     GL_TEXTURE_1D_ARRAY,
 637     GL_TEXTURE_2D_ARRAY,
 638     GL_TEXTURE_CUBE_MAP_ARRAY,
 639 };
 640
 641
 642 static GLenum
 643 getTextureTarget(GLint texture)
 644 {
 645     if (!glIsTexture(texture)) {
 646         return GL_NONE;
 647     }
 648
 649     for (unsigned i = 0; i < sizeof(textureTargets)/sizeof(textureTargets[0]); ++i) {
 650         GLenum target = textureTargets[i];
 651         GLenum binding = getTextureBinding(target);
 652
 653         while (glGetError() != GL_NO_ERROR)
 654             ;
 655
 656         GLint bound_texture = 0;
 657         glGetIntegerv(binding, &bound_texture);
 658         glBindTexture(target, texture);
 659
 660         bool succeeded = glGetError() == GL_NO_ERROR;
 661
 662         glBindTexture(target, bound_texture);
 663
 664         if (succeeded) {
 665             return target;
 666         }
 667     }
 668
 669     return GL_NONE;
 670 }
 671
 672
 673 static bool
 674 getBoundRenderbufferDesc(Context &context, ImageDesc &desc)
 675 {
 676     glGetRenderbufferParameteriv(GL_RENDERBUFFER, GL_RENDERBUFFER_WIDTH, &desc.width);
 677     glGetRenderbufferParameteriv(GL_RENDERBUFFER, GL_RENDERBUFFER_HEIGHT, &desc.height);
 678     desc.depth = 1;
 679
 680     glGetRenderbufferParameteriv(GL_RENDERBUFFER, GL_RENDERBUFFER_INTERNAL_FORMAT, &desc.internalFormat);
 681
 682     return desc.valid();
 683 }
 684
 685
 686 static bool
 687 getRenderbufferDesc(Context &context, GLint renderbuffer, ImageDesc &desc)
 688 {
 689     GLint bound_renderbuffer = 0;
 690     glGetIntegerv(GL_RENDERBUFFER_BINDING, &bound_renderbuffer);
 691     glBindRenderbuffer(GL_RENDERBUFFER, renderbuffer);
 692
 693     getBoundRenderbufferDesc(context, desc);
 694
 695     glBindRenderbuffer(GL_RENDERBUFFER, bound_renderbuffer);
 696
 697     return desc.valid();
 698 }
 699
 700
 701 static bool
 702 getFramebufferAttachmentDesc(Context &context, GLenum target, GLenum attachment, ImageDesc &desc)
 703 {
 704     GLint object_type = GL_NONE;
 705     glGetFramebufferAttachmentParameteriv(target, attachment,
 706                                           GL_FRAMEBUFFER_ATTACHMENT_OBJECT_TYPE,
 707                                           &object_type);
 708     if (object_type == GL_NONE) {
 709         return false;
 710     }
 711
 712     GLint object_name = 0;
 713     glGetFramebufferAttachmentParameteriv(target, attachment,
 714                                           GL_FRAMEBUFFER_ATTACHMENT_OBJECT_NAME,
 715                                           &object_name);
 716     if (object_name == 0) {
 717         return false;
 718     }
 719
 720     if (object_type == GL_RENDERBUFFER) {
 721         return getRenderbufferDesc(context, object_name, desc);
 722     } else if (object_type == GL_TEXTURE) {
 723         GLint texture_face = 0;
 724         glGetFramebufferAttachmentParameteriv(target, attachment,
 725                                               GL_FRAMEBUFFER_ATTACHMENT_TEXTURE_CUBE_MAP_FACE,
 726                                               &texture_face);
 727
 728         GLint texture_level = 0;
 729         glGetFramebufferAttachmentParameteriv(target, attachment,
 730                                               GL_FRAMEBUFFER_ATTACHMENT_TEXTURE_LEVEL,
 731                                               &texture_level);
 732
 733         GLint bound_texture = 0;
 734         if (texture_face != 0) {
 735             glGetIntegerv(GL_TEXTURE_BINDING_CUBE_MAP, &bound_texture);
 736             getActiveTextureLevelDesc(context, texture_face, texture_level, desc);
 737             glBindTexture(GL_TEXTURE_CUBE_MAP, bound_texture);
 738         } else {
 739             GLenum texture_target = getTextureTarget(object_name);
 740             GLenum texture_binding = getTextureBinding(texture_target);
 741             glGetIntegerv(texture_binding, &bound_texture);
 742             glBindTexture(texture_target, object_name);
 743             getActiveTextureLevelDesc(context, texture_face, texture_level, desc);
 744             glBindTexture(texture_binding, bound_texture);
 745         }
 746
 747         return desc.valid();
 748     } else {
 749         std::cerr << "warning: unexpected GL_FRAMEBUFFER_ATTACHMENT_OBJECT_TYPE = " << object_type << "\n";
 750         return false;
 751     }
 752 }
 753
 754
 755
 756 image::Image *
 757 getDrawBufferImage() {
 758     GLenum format = GL_RGB;
 759     GLint channels = _gl_format_channels(format);
 760     if (channels > 4) {
 761         return NULL;
 762     }
 763
 764     Context context;
 765
 766     GLenum framebuffer_binding;
 767     GLenum framebuffer_target;
 768     if (context.ES) {
 769         framebuffer_binding = GL_FRAMEBUFFER_BINDING;
 770         framebuffer_target = GL_FRAMEBUFFER;
 771     } else {
 772         framebuffer_binding = GL_DRAW_FRAMEBUFFER_BINDING;
 773         framebuffer_target = GL_DRAW_FRAMEBUFFER;
 774     }
 775
 776     GLint draw_framebuffer = 0;
 777     glGetIntegerv(framebuffer_binding, &draw_framebuffer);
 778
 779     GLint draw_buffer = GL_NONE;
 780     ImageDesc desc;
 781     if (draw_framebuffer) {
 782         if (context.ARB_draw_buffers) {
 783             glGetIntegerv(GL_DRAW_BUFFER0, &draw_buffer);
 784             if (draw_buffer == GL_NONE) {
 785                 return NULL;
 786             }
 787         } else {
 788             // GL_COLOR_ATTACHMENT0 is implied
 789             draw_buffer = GL_COLOR_ATTACHMENT0;
 790         }
 791
 792         if (!getFramebufferAttachmentDesc(context, framebuffer_target, draw_buffer, desc)) {
 793             return NULL;
 794         }
 795     } else {
 796         if (context.ES) {
 797             // XXX: Draw buffer is always FRONT for single buffer context, BACK
 798             // for double buffered contexts. There is no way to know which (as
 799             // GL_DOUBLEBUFFER state is also unavailable), so always assume
 800             // double-buffering.
 801             draw_buffer = GL_BACK;
 802         } else {
 803             glGetIntegerv(GL_DRAW_BUFFER, &draw_buffer);
 804             if (draw_buffer == GL_NONE) {
 805                 return NULL;
 806             }
 807         }
 808
 809         if (!getDrawableBounds(&desc.width, &desc.height)) {
 810             return NULL;
 811         }
 812
 813         desc.depth = 1;
 814     }
 815
 816     GLenum type = GL_UNSIGNED_BYTE;
 817
 818 #if DEPTH_AS_RGBA
 819     if (format == GL_DEPTH_COMPONENT) {
 820         type = GL_UNSIGNED_INT;
 821         channels = 4;
 822     }
 823 #endif
 824
 825     image::Image *image = new image::Image(desc.width, desc.height, channels, true);
 826     if (!image) {
 827         return NULL;
 828     }
 829
 830     while (glGetError() != GL_NO_ERROR) {}
 831
 832     GLint read_framebuffer = 0;
 833     GLint read_buffer = GL_NONE;
 834     if (!context.ES) {
 835         glGetIntegerv(GL_READ_FRAMEBUFFER_BINDING, &read_framebuffer);
 836         glBindFramebuffer(GL_READ_FRAMEBUFFER, draw_framebuffer);
 837
 838         glGetIntegerv(GL_READ_BUFFER, &read_buffer);
 839         glReadBuffer(draw_buffer);
 840     }
 841
 842     // TODO: reset imaging state too
 843     context.resetPixelPackState();
 844
 845     glReadPixels(0, 0, desc.width, desc.height, format, type, image->pixels);
 846
 847     context.restorePixelPackState();
 848
 849     if (!context.ES) {
 850         glReadBuffer(read_buffer);
 851         glBindFramebuffer(GL_READ_FRAMEBUFFER, read_framebuffer);
 852     }
 853
 854     GLenum error = glGetError();
 855     if (error != GL_NO_ERROR) {
 856         do {
 857             std::cerr << "warning: " << enumToString(error) << " while getting snapshot\n";
 858             error = glGetError();
 859         } while(error != GL_NO_ERROR);
 860         delete image;
 861         return NULL;
 862     }
 863
 864     return image;
 865 }
 866
 867
 868 /**
 869  * Dump the image of the currently bound read buffer.
 870  */
 871 static inline void
 872 dumpReadBufferImage(JSONWriter &json, GLint width, GLint height, GLenum format,
 873                     GLint internalFormat = GL_NONE)
 874 {
 875     GLint channels = _gl_format_channels(format);
 876
 877     if (internalFormat == GL_NONE) {
 878         internalFormat = format;
 879     }
 880
 881     Context context;
 882
 883     GLenum type = GL_UNSIGNED_BYTE;
 884
 885 #if DEPTH_AS_RGBA
 886     if (format == GL_DEPTH_COMPONENT) {
 887         type = GL_UNSIGNED_INT;
 888         channels = 4;
 889     }
 890 #endif
 891
 892     image::Image *image = new image::Image(width, height, channels, true);
 893
 894     // TODO: reset imaging state too
 895     context.resetPixelPackState();
 896
 897     glReadPixels(0, 0, width, height, format, type, image->pixels);
 898
 899     context.restorePixelPackState();
 900
 901     json.writeImage(image, formatToString(internalFormat));
 902
 903     delete image;
 904 }
 905
 906
 907 static inline GLuint
 908 downsampledFramebuffer(Context &context,
 909                        GLuint oldFbo, GLint drawbuffer,
 910                        GLint colorRb, GLint depthRb, GLint stencilRb,
 911                        GLuint *rbs, GLint *numRbs)
 912 {
 913     GLuint fbo;
 914
 915
 916     *numRbs = 0;
 917
 918     glGenFramebuffers(1, &fbo);
 919     glBindFramebuffer(GL_FRAMEBUFFER, fbo);
 920
 921     {
 922         // color buffer
 923         ImageDesc desc;
 924         glBindRenderbuffer(GL_RENDERBUFFER, colorRb);
 925         getBoundRenderbufferDesc(context, desc);
 926
 927         glGenRenderbuffers(1, &rbs[*numRbs]);
 928         glBindRenderbuffer(GL_RENDERBUFFER, rbs[*numRbs]);
 929         glRenderbufferStorage(GL_RENDERBUFFER, desc.internalFormat, desc.width, desc.height);
 930         glFramebufferRenderbuffer(GL_FRAMEBUFFER, drawbuffer,
 931                                   GL_RENDERBUFFER, rbs[*numRbs]);
 932
 933         glBindFramebuffer(GL_READ_FRAMEBUFFER, oldFbo);
 934         glBindFramebuffer(GL_DRAW_FRAMEBUFFER, fbo);
 935         glDrawBuffer(drawbuffer);
 936         glReadBuffer(drawbuffer);
 937         glBlitFramebuffer(0, 0, desc.width, desc.height, 0, 0, desc.width, desc.height,
 938                           GL_COLOR_BUFFER_BIT, GL_NEAREST);
 939         glBindFramebuffer(GL_FRAMEBUFFER, fbo);
 940         ++*numRbs;
 941     }
 942
 943     if (stencilRb == depthRb && stencilRb) {
 944         //combined depth and stencil buffer
 945         ImageDesc desc;
 946         glBindRenderbuffer(GL_RENDERBUFFER, depthRb);
 947         getBoundRenderbufferDesc(context, desc);
 948
 949         glGenRenderbuffers(1, &rbs[*numRbs]);
 950         glBindRenderbuffer(GL_RENDERBUFFER, rbs[*numRbs]);
 951         glRenderbufferStorage(GL_RENDERBUFFER, desc.internalFormat, desc.width, desc.height);
 952         glFramebufferRenderbuffer(GL_FRAMEBUFFER, GL_DEPTH_STENCIL_ATTACHMENT,
 953                                   GL_RENDERBUFFER, rbs[*numRbs]);
 954         glBindFramebuffer(GL_READ_FRAMEBUFFER, oldFbo);
 955         glBindFramebuffer(GL_DRAW_FRAMEBUFFER, fbo);
 956         glBlitFramebuffer(0, 0, desc.width, desc.height, 0, 0, desc.width, desc.height,
 957                           GL_DEPTH_BUFFER_BIT | GL_STENCIL_BUFFER_BIT, GL_NEAREST);
 958         glBindFramebuffer(GL_FRAMEBUFFER, fbo);
 959         ++*numRbs;
 960     } else {
 961         if (depthRb) {
 962             ImageDesc desc;
 963             glBindRenderbuffer(GL_RENDERBUFFER, depthRb);
 964             getBoundRenderbufferDesc(context, desc);
 965
 966             glGenRenderbuffers(1, &rbs[*numRbs]);
 967             glBindRenderbuffer(GL_RENDERBUFFER, rbs[*numRbs]);
 968             glRenderbufferStorage(GL_RENDERBUFFER, desc.internalFormat, desc.width, desc.height);
 969             glFramebufferRenderbuffer(GL_FRAMEBUFFER,
 970                                       GL_DEPTH_ATTACHMENT,
 971                                       GL_RENDERBUFFER, rbs[*numRbs]);
 972             glBindFramebuffer(GL_READ_FRAMEBUFFER, oldFbo);
 973             glBindFramebuffer(GL_DRAW_FRAMEBUFFER, fbo);
 974             glDrawBuffer(GL_DEPTH_ATTACHMENT);
 975             glReadBuffer(GL_DEPTH_ATTACHMENT);
 976             glBlitFramebuffer(0, 0, desc.width, desc.height, 0, 0, desc.width, desc.height,
 977                               GL_DEPTH_BUFFER_BIT, GL_NEAREST);
 978             ++*numRbs;
 979         }
 980         if (stencilRb) {
 981             ImageDesc desc;
 982             glBindRenderbuffer(GL_RENDERBUFFER, stencilRb);
 983             getBoundRenderbufferDesc(context, desc);
 984
 985             glGenRenderbuffers(1, &rbs[*numRbs]);
 986             glBindRenderbuffer(GL_RENDERBUFFER, rbs[*numRbs]);
 987             glRenderbufferStorage(GL_RENDERBUFFER, desc.internalFormat, desc.width, desc.height);
 988             glFramebufferRenderbuffer(GL_FRAMEBUFFER,
 989                                       GL_STENCIL_ATTACHMENT,
 990                                       GL_RENDERBUFFER, rbs[*numRbs]);
 991             glBindFramebuffer(GL_READ_FRAMEBUFFER, oldFbo);
 992             glBindFramebuffer(GL_DRAW_FRAMEBUFFER, fbo);
 993             glDrawBuffer(GL_STENCIL_ATTACHMENT);
 994             glReadBuffer(GL_STENCIL_ATTACHMENT);
 995             glBlitFramebuffer(0, 0, desc.width, desc.height, 0, 0, desc.width, desc.height,
 996                               GL_STENCIL_BUFFER_BIT, GL_NEAREST);
 997             ++*numRbs;
 998         }
 999     }
1000
1001     return fbo;
1002 }
1003
1004
1005 /**
1006  * Dump images of current draw drawable/window.
1007  */
1008 static void
1009 dumpDrawableImages(JSONWriter &json, Context &context)
1010 {
1011     GLint width, height;
1012
1013     if (!getDrawableBounds(&width, &height)) {
1014         return;
1015     }
1016
1017     GLint draw_buffer = GL_NONE;
1018     if (context.ES) {
1019         // XXX: Draw buffer is always FRONT for single buffer context, BACK for
1020         // double buffered contexts. There is no way to know which (as
1021         // GL_DOUBLEBUFFER state is also unavailable), so always assume
1022         // double-buffering.
1023         draw_buffer = GL_BACK;
1024     } else {
1025         glGetIntegerv(GL_DRAW_BUFFER, &draw_buffer);
1026     }
1027
1028     if (draw_buffer != GL_NONE) {
1029         // Read from current draw buffer
1030         GLint read_buffer = GL_NONE;
1031         if (!context.ES) {
1032             glGetIntegerv(GL_READ_BUFFER, &read_buffer);
1033             glReadBuffer(draw_buffer);
1034         }
1035
1036         GLint alpha_bits = 0;
1037 #if 0
1038         // XXX: Ignore alpha until we are able to match the traced visual
1039         glGetIntegerv(GL_ALPHA_BITS, &alpha_bits);
1040 #endif
1041         GLenum format = alpha_bits ? GL_RGBA : GL_RGB;
1042         json.beginMember(enumToString(draw_buffer));
1043         dumpReadBufferImage(json, width, height, format);
1044         json.endMember();
1045
1046         // Restore original read buffer
1047         if (!context.ES) {
1048             glReadBuffer(read_buffer);
1049         }
1050     }
1051
1052     if (!context.ES) {
1053         GLint depth_bits = 0;
1054         glGetIntegerv(GL_DEPTH_BITS, &depth_bits);
1055         if (depth_bits) {
1056             json.beginMember("GL_DEPTH_COMPONENT");
1057             dumpReadBufferImage(json, width, height, GL_DEPTH_COMPONENT);
1058             json.endMember();
1059         }
1060
1061         GLint stencil_bits = 0;
1062         glGetIntegerv(GL_STENCIL_BITS, &stencil_bits);
1063         if (stencil_bits) {
1064             json.beginMember("GL_STENCIL_INDEX");
1065             dumpReadBufferImage(json, width, height, GL_STENCIL_INDEX);
1066             json.endMember();
1067         }
1068     }
1069 }
1070
1071
1072 /**
1073  * Dump the specified framebuffer attachment.
1074  *
1075  * In the case of a color attachment, it assumes it is already bound for read.
1076  */
1077 static void
1078 dumpFramebufferAttachment(JSONWriter &json, Context &context, GLenum target, GLenum attachment, GLenum format)
1079 {
1080     ImageDesc desc;
1081     if (!getFramebufferAttachmentDesc(context, target, attachment, desc)) {
1082         return;
1083     }
1084
1085     json.beginMember(enumToString(attachment));
1086     dumpReadBufferImage(json, desc.width, desc.height, format, desc.internalFormat);
1087     json.endMember();
1088 }
1089
1090
1091 static void
1092 dumpFramebufferAttachments(JSONWriter &json, Context &context, GLenum target)
1093 {
1094     GLint read_framebuffer = 0;
1095     glGetIntegerv(GL_READ_FRAMEBUFFER_BINDING, &read_framebuffer);
1096
1097     GLint read_buffer = GL_NONE;
1098     glGetIntegerv(GL_READ_BUFFER, &read_buffer);
1099
1100     GLint max_draw_buffers = 1;
1101     glGetIntegerv(GL_MAX_DRAW_BUFFERS, &max_draw_buffers);
1102     GLint max_color_attachments = 0;
1103     glGetIntegerv(GL_MAX_COLOR_ATTACHMENTS, &max_color_attachments);
1104
1105     for (GLint i = 0; i < max_draw_buffers; ++i) {
1106         GLint draw_buffer = GL_NONE;
1107         glGetIntegerv(GL_DRAW_BUFFER0 + i, &draw_buffer);
1108         if (draw_buffer != GL_NONE) {
1109             glReadBuffer(draw_buffer);
1110             GLint attachment;
1111             if (draw_buffer >= GL_COLOR_ATTACHMENT0 && draw_buffer < GL_COLOR_ATTACHMENT0 + max_color_attachments) {
1112                 attachment = draw_buffer;
1113             } else {
1114                 std::cerr << "warning: unexpected GL_DRAW_BUFFER" << i << " = " << draw_buffer << "\n";
1115                 attachment = GL_COLOR_ATTACHMENT0;
1116             }
1117             GLint alpha_size = 0;
1118             glGetFramebufferAttachmentParameteriv(target, attachment,
1119                                                   GL_FRAMEBUFFER_ATTACHMENT_ALPHA_SIZE,
1120                                                   &alpha_size);
1121             GLenum format = alpha_size ? GL_RGBA : GL_RGB;
1122             dumpFramebufferAttachment(json, context, target, attachment, format);
1123         }
1124     }
1125
1126     glReadBuffer(read_buffer);
1127
1128     if (!context.ES) {
1129         dumpFramebufferAttachment(json, context, target, GL_DEPTH_ATTACHMENT, GL_DEPTH_COMPONENT);
1130         dumpFramebufferAttachment(json, context, target, GL_STENCIL_ATTACHMENT, GL_STENCIL_INDEX);
1131     }
1132
1133     glBindFramebuffer(GL_READ_FRAMEBUFFER, read_framebuffer);
1134 }
1135
1136
1137 void
1138 dumpFramebuffer(JSONWriter &json, Context &context)
1139 {
1140     json.beginMember("framebuffer");
1141     json.beginObject();
1142
1143     GLint boundDrawFbo = 0, boundReadFbo = 0;
1144     glGetIntegerv(GL_DRAW_FRAMEBUFFER_BINDING, &boundDrawFbo);
1145     glGetIntegerv(GL_READ_FRAMEBUFFER_BINDING, &boundReadFbo);
1146     if (!boundDrawFbo) {
1147         dumpDrawableImages(json, context);
1148     } else if (context.ES) {
1149         dumpFramebufferAttachments(json, context, GL_FRAMEBUFFER);
1150     } else {
1151         GLint colorRb = 0, stencilRb = 0, depthRb = 0;
1152         GLint draw_buffer0 = GL_NONE;
1153         glGetIntegerv(GL_DRAW_BUFFER0, &draw_buffer0);
1154         bool multisample = false;
1155
1156         GLint boundRb = 0;
1157         glGetIntegerv(GL_RENDERBUFFER_BINDING, &boundRb);
1158
1159         GLint object_type;
1160         glGetFramebufferAttachmentParameteriv(GL_DRAW_FRAMEBUFFER, draw_buffer0, GL_FRAMEBUFFER_ATTACHMENT_OBJECT_TYPE, &object_type);
1161         if (object_type == GL_RENDERBUFFER) {
1162             glGetFramebufferAttachmentParameteriv(GL_DRAW_FRAMEBUFFER, draw_buffer0, GL_FRAMEBUFFER_ATTACHMENT_OBJECT_NAME, &colorRb);
1163             glBindRenderbuffer(GL_RENDERBUFFER, colorRb);
1164             GLint samples = 0;
1165             glGetRenderbufferParameteriv(GL_RENDERBUFFER, GL_RENDERBUFFER_SAMPLES, &samples);
1166             if (samples) {
1167                 multisample = true;
1168             }
1169         }
1170
1171         glGetFramebufferAttachmentParameteriv(GL_DRAW_FRAMEBUFFER, GL_DEPTH_ATTACHMENT, GL_FRAMEBUFFER_ATTACHMENT_OBJECT_TYPE, &object_type);
1172         if (object_type == GL_RENDERBUFFER) {
1173             glGetFramebufferAttachmentParameteriv(GL_DRAW_FRAMEBUFFER, GL_DEPTH_ATTACHMENT, GL_FRAMEBUFFER_ATTACHMENT_OBJECT_NAME, &depthRb);
1174             glBindRenderbuffer(GL_RENDERBUFFER, depthRb);
1175             GLint samples = 0;
1176             glGetRenderbufferParameteriv(GL_RENDERBUFFER, GL_RENDERBUFFER_SAMPLES, &samples);
1177             if (samples) {
1178                 multisample = true;
1179             }
1180         }
1181
1182         glGetFramebufferAttachmentParameteriv(GL_DRAW_FRAMEBUFFER, GL_STENCIL_ATTACHMENT, GL_FRAMEBUFFER_ATTACHMENT_OBJECT_TYPE, &object_type);
1183         if (object_type == GL_RENDERBUFFER) {
1184             glGetFramebufferAttachmentParameteriv(GL_DRAW_FRAMEBUFFER, GL_STENCIL_ATTACHMENT, GL_FRAMEBUFFER_ATTACHMENT_OBJECT_NAME, &stencilRb);
1185             glBindRenderbuffer(GL_RENDERBUFFER, stencilRb);
1186             GLint samples = 0;
1187             glGetRenderbufferParameteriv(GL_RENDERBUFFER, GL_RENDERBUFFER_SAMPLES, &samples);
1188             if (samples) {
1189                 multisample = true;
1190             }
1191         }
1192
1193         glBindRenderbuffer(GL_RENDERBUFFER, boundRb);
1194
1195         GLuint rbs[3];
1196         GLint numRbs = 0;
1197         GLuint fboCopy = 0;
1198
1199         if (multisample) {
1200             // glReadPixels doesnt support multisampled buffers so we need
1201             // to blit the fbo to a temporary one
1202             fboCopy = downsampledFramebuffer(context,
1203                                              boundDrawFbo, draw_buffer0,
1204                                              colorRb, depthRb, stencilRb,
1205                                              rbs, &numRbs);
1206         }
1207
1208         dumpFramebufferAttachments(json, context, GL_DRAW_FRAMEBUFFER);
1209
1210         if (multisample) {
1211             glBindRenderbuffer(GL_RENDERBUFFER_BINDING, boundRb);
1212             glDeleteRenderbuffers(numRbs, rbs);
1213             glDeleteFramebuffers(1, &fboCopy);
1214         }
1215
1216         glBindFramebuffer(GL_READ_FRAMEBUFFER, boundReadFbo);
1217         glBindFramebuffer(GL_DRAW_FRAMEBUFFER, boundDrawFbo);
1218     }
1219
1220     json.endObject();
1221     json.endMember(); // framebuffer
1222 }
1223
1224
1225 } /* namespace glstate */