git.cworth.org Git - apitrace/blob - glstate.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 <string.h>
  28
  29 #include <algorithm>
  30 #include <iostream>
  31 #include <map>
  32 #include <sstream>
  33
  34 #include "image.hpp"
  35 #include "json.hpp"
  36 #include "glproc.hpp"
  37 #include "glsize.hpp"
  38 #include "glstate.hpp"
  39
  40
  41 #ifdef __APPLE__
  42
  43 #include <Carbon/Carbon.h>
  44
  45 #ifdef __cplusplus
  46 extern "C" {
  47 #endif
  48
  49 OSStatus CGSGetSurfaceBounds(CGSConnectionID, CGWindowID, CGSSurfaceID, CGRect *);
  50
  51 #ifdef __cplusplus
  52 }
  53 #endif
  54
  55 #endif /* __APPLE__ */
  56
  57
  58 namespace glstate {
  59
  60
  61 static inline void
  62 resetPixelPackState(void) {
  63     glPushClientAttrib(GL_CLIENT_PIXEL_STORE_BIT);
  64     glPixelStorei(GL_PACK_SWAP_BYTES, GL_FALSE);
  65     glPixelStorei(GL_PACK_LSB_FIRST, GL_FALSE);
  66     glPixelStorei(GL_PACK_ROW_LENGTH, 0);
  67     glPixelStorei(GL_PACK_IMAGE_HEIGHT, 0);
  68     glPixelStorei(GL_PACK_SKIP_ROWS, 0);
  69     glPixelStorei(GL_PACK_SKIP_PIXELS, 0);
  70     glPixelStorei(GL_PACK_SKIP_IMAGES, 0);
  71     glPixelStorei(GL_PACK_ALIGNMENT, 1);
  72     glBindBuffer(GL_PIXEL_PACK_BUFFER, 0);
  73 }
  74
  75
  76 static inline void
  77 restorePixelPackState(void) {
  78     glPopClientAttrib();
  79 }
  80
  81
  82 // Mapping from shader type to shader source, used to accumulated the sources
  83 // of different shaders with same type.
  84 typedef std::map<std::string, std::string> ShaderMap;
  85
  86
  87 static void
  88 getShaderSource(ShaderMap &shaderMap, GLuint shader)
  89 {
  90     if (!shader) {
  91         return;
  92     }
  93
  94     GLint shader_type = 0;
  95     glGetShaderiv(shader, GL_SHADER_TYPE, &shader_type);
  96     if (!shader_type) {
  97         return;
  98     }
  99
 100     GLint source_length = 0;
 101     glGetShaderiv(shader, GL_SHADER_SOURCE_LENGTH, &source_length);
 102     if (!source_length) {
 103         return;
 104     }
 105
 106     GLchar *source = new GLchar[source_length];
 107     GLsizei length = 0;
 108     source[0] = 0;
 109     glGetShaderSource(shader, source_length, &length, source);
 110
 111     shaderMap[enumToString(shader_type)] += source;
 112
 113     delete [] source;
 114 }
 115
 116
 117 static void
 118 getShaderObjSource(ShaderMap &shaderMap, GLhandleARB shaderObj)
 119 {
 120     if (!shaderObj) {
 121         return;
 122     }
 123
 124     GLint object_type = 0;
 125     glGetObjectParameterivARB(shaderObj, GL_OBJECT_TYPE_ARB, &object_type);
 126     if (object_type != GL_SHADER_OBJECT_ARB) {
 127         return;
 128     }
 129
 130     GLint shader_type = 0;
 131     glGetObjectParameterivARB(shaderObj, GL_OBJECT_SUBTYPE_ARB, &shader_type);
 132     if (!shader_type) {
 133         return;
 134     }
 135
 136     GLint source_length = 0;
 137     glGetObjectParameterivARB(shaderObj, GL_OBJECT_SHADER_SOURCE_LENGTH_ARB, &source_length);
 138     if (!source_length) {
 139         return;
 140     }
 141
 142     GLcharARB *source = new GLcharARB[source_length];
 143     GLsizei length = 0;
 144     source[0] = 0;
 145     glGetShaderSource(shaderObj, source_length, &length, source);
 146
 147     shaderMap[enumToString(shader_type)] += source;
 148
 149     delete [] source;
 150 }
 151
 152
 153 static inline void
 154 dumpProgram(JSONWriter &json, GLint program)
 155 {
 156     GLint attached_shaders = 0;
 157     glGetProgramiv(program, GL_ATTACHED_SHADERS, &attached_shaders);
 158     if (!attached_shaders) {
 159         return;
 160     }
 161
 162     ShaderMap shaderMap;
 163
 164     GLuint *shaders = new GLuint[attached_shaders];
 165     GLsizei count = 0;
 166     glGetAttachedShaders(program, attached_shaders, &count, shaders);
 167     std::sort(shaders, shaders + count);
 168     for (GLsizei i = 0; i < count; ++ i) {
 169        getShaderSource(shaderMap, shaders[i]);
 170     }
 171     delete [] shaders;
 172
 173     for (ShaderMap::const_iterator it = shaderMap.begin(); it != shaderMap.end(); ++it) {
 174         json.beginMember(it->first);
 175         json.writeString(it->second);
 176         json.endMember();
 177     }
 178 }
 179
 180
 181 static inline void
 182 dumpProgramObj(JSONWriter &json, GLhandleARB programObj)
 183 {
 184     GLint attached_shaders = 0;
 185     glGetObjectParameterivARB(programObj, GL_OBJECT_ATTACHED_OBJECTS_ARB, &attached_shaders);
 186     if (!attached_shaders) {
 187         return;
 188     }
 189
 190     ShaderMap shaderMap;
 191
 192     GLhandleARB *shaderObjs = new GLhandleARB[attached_shaders];
 193     GLsizei count = 0;
 194     glGetAttachedObjectsARB(programObj, attached_shaders, &count, shaderObjs);
 195     std::sort(shaderObjs, shaderObjs + count);
 196     for (GLsizei i = 0; i < count; ++ i) {
 197        getShaderObjSource(shaderMap, shaderObjs[i]);
 198     }
 199     delete [] shaderObjs;
 200
 201     for (ShaderMap::const_iterator it = shaderMap.begin(); it != shaderMap.end(); ++it) {
 202         json.beginMember(it->first);
 203         json.writeString(it->second);
 204         json.endMember();
 205     }
 206 }
 207
 208 /*
 209  * When fetching the uniform name of an array we usually get name[0]
 210  * so we need to cut the trailing "[0]" in order to properly construct
 211  * array names later. Otherwise we endup with stuff like
 212  * uniformArray[0][0],
 213  * uniformArray[0][1],
 214  * instead of
 215  * uniformArray[0],
 216  * uniformArray[1].
 217  */
 218 static std::string
 219 resolveUniformName(const GLchar *name,  GLint size)
 220 {
 221     std::string qualifiedName(name);
 222     if (size > 1) {
 223         std::string::size_type nameLength = qualifiedName.length();
 224         static const char * const arrayStart = "[0]";
 225         static const int arrayStartLen = 3;
 226         if (qualifiedName.rfind(arrayStart) == (nameLength - arrayStartLen)) {
 227             qualifiedName = qualifiedName.substr(0, nameLength - 3);
 228         }
 229     }
 230     return qualifiedName;
 231 }
 232
 233 static void
 234 dumpUniform(JSONWriter &json, GLint program, GLint size, GLenum type, const GLchar *name) {
 235     GLenum elemType;
 236     GLint numElems;
 237     __gl_uniform_size(type, elemType, numElems);
 238     if (elemType == GL_NONE) {
 239         return;
 240     }
 241
 242     GLfloat fvalues[4*4];
 243     GLdouble dvalues[4*4];
 244     GLint ivalues[4*4];
 245     GLuint uivalues[4*4];
 246
 247     GLint i, j;
 248
 249     std::string qualifiedName = resolveUniformName(name, size);
 250
 251     for (i = 0; i < size; ++i) {
 252         std::stringstream ss;
 253         ss << qualifiedName;
 254
 255         if (size > 1) {
 256             ss << '[' << i << ']';
 257         }
 258
 259         std::string elemName = ss.str();
 260
 261         json.beginMember(elemName);
 262
 263         GLint location = glGetUniformLocation(program, elemName.c_str());
 264
 265         if (numElems > 1) {
 266             json.beginArray();
 267         }
 268
 269         switch (elemType) {
 270         case GL_FLOAT:
 271             glGetUniformfv(program, location, fvalues);
 272             for (j = 0; j < numElems; ++j) {
 273                 json.writeNumber(fvalues[j]);
 274             }
 275             break;
 276         case GL_DOUBLE:
 277             glGetUniformdv(program, location, dvalues);
 278             for (j = 0; j < numElems; ++j) {
 279                 json.writeNumber(dvalues[j]);
 280             }
 281             break;
 282         case GL_INT:
 283             glGetUniformiv(program, location, ivalues);
 284             for (j = 0; j < numElems; ++j) {
 285                 json.writeNumber(ivalues[j]);
 286             }
 287             break;
 288         case GL_UNSIGNED_INT:
 289             glGetUniformuiv(program, location, uivalues);
 290             for (j = 0; j < numElems; ++j) {
 291                 json.writeNumber(uivalues[j]);
 292             }
 293             break;
 294         case GL_BOOL:
 295             glGetUniformiv(program, location, ivalues);
 296             for (j = 0; j < numElems; ++j) {
 297                 json.writeBool(ivalues[j]);
 298             }
 299             break;
 300         default:
 301             assert(0);
 302             break;
 303         }
 304
 305         if (numElems > 1) {
 306             json.endArray();
 307         }
 308
 309         json.endMember();
 310     }
 311 }
 312
 313
 314 static void
 315 dumpUniformARB(JSONWriter &json, GLhandleARB programObj, GLint size, GLenum type, const GLchar *name) {
 316
 317     GLenum elemType;
 318     GLint numElems;
 319     __gl_uniform_size(type, elemType, numElems);
 320     if (elemType == GL_NONE) {
 321         return;
 322     }
 323
 324     GLfloat fvalues[4*4];
 325     GLint ivalues[4*4];
 326
 327     GLint i, j;
 328
 329     std::string qualifiedName = resolveUniformName(name, size);
 330
 331     for (i = 0; i < size; ++i) {
 332         std::stringstream ss;
 333         ss << qualifiedName;
 334
 335         if (size > 1) {
 336             ss << '[' << i << ']';
 337         }
 338
 339         std::string elemName = ss.str();
 340
 341         json.beginMember(elemName);
 342
 343         GLint location = glGetUniformLocationARB(programObj, elemName.c_str());
 344
 345         if (numElems > 1) {
 346             json.beginArray();
 347         }
 348
 349         switch (elemType) {
 350         case GL_DOUBLE:
 351             // glGetUniformdvARB does not exists
 352         case GL_FLOAT:
 353             glGetUniformfvARB(programObj, location, fvalues);
 354             for (j = 0; j < numElems; ++j) {
 355                 json.writeNumber(fvalues[j]);
 356             }
 357             break;
 358         case GL_UNSIGNED_INT:
 359             // glGetUniformuivARB does not exists
 360         case GL_INT:
 361             glGetUniformivARB(programObj, location, ivalues);
 362             for (j = 0; j < numElems; ++j) {
 363                 json.writeNumber(ivalues[j]);
 364             }
 365             break;
 366         case GL_BOOL:
 367             glGetUniformivARB(programObj, location, ivalues);
 368             for (j = 0; j < numElems; ++j) {
 369                 json.writeBool(ivalues[j]);
 370             }
 371             break;
 372         default:
 373             assert(0);
 374             break;
 375         }
 376
 377         if (numElems > 1) {
 378             json.endArray();
 379         }
 380
 381         json.endMember();
 382     }
 383 }
 384
 385
 386 static inline void
 387 dumpProgramUniforms(JSONWriter &json, GLint program)
 388 {
 389     GLint active_uniforms = 0;
 390     glGetProgramiv(program, GL_ACTIVE_UNIFORMS, &active_uniforms);
 391     if (!active_uniforms) {
 392         return;
 393     }
 394
 395     GLint active_uniform_max_length = 0;
 396     glGetProgramiv(program, GL_ACTIVE_UNIFORM_MAX_LENGTH, &active_uniform_max_length);
 397     GLchar *name = new GLchar[active_uniform_max_length];
 398     if (!name) {
 399         return;
 400     }
 401
 402     for (GLint index = 0; index < active_uniforms; ++index) {
 403         GLsizei length = 0;
 404         GLint size = 0;
 405         GLenum type = GL_NONE;
 406         glGetActiveUniform(program, index, active_uniform_max_length, &length, &size, &type, name);
 407
 408         dumpUniform(json, program, size, type, name);
 409     }
 410
 411     delete [] name;
 412 }
 413
 414
 415 static inline void
 416 dumpProgramObjUniforms(JSONWriter &json, GLhandleARB programObj)
 417 {
 418     GLint active_uniforms = 0;
 419     glGetObjectParameterivARB(programObj, GL_OBJECT_ACTIVE_UNIFORMS_ARB, &active_uniforms);
 420     if (!active_uniforms) {
 421         return;
 422     }
 423
 424     GLint active_uniform_max_length = 0;
 425     glGetObjectParameterivARB(programObj, GL_OBJECT_ACTIVE_UNIFORM_MAX_LENGTH_ARB, &active_uniform_max_length);
 426     GLchar *name = new GLchar[active_uniform_max_length];
 427     if (!name) {
 428         return;
 429     }
 430
 431     for (GLint index = 0; index < active_uniforms; ++index) {
 432         GLsizei length = 0;
 433         GLint size = 0;
 434         GLenum type = GL_NONE;
 435         glGetActiveUniformARB(programObj, index, active_uniform_max_length, &length, &size, &type, name);
 436
 437         dumpUniformARB(json, programObj, size, type, name);
 438     }
 439
 440     delete [] name;
 441 }
 442
 443
 444 static inline void
 445 dumpArbProgram(JSONWriter &json, GLenum target)
 446 {
 447     if (!glIsEnabled(target)) {
 448         return;
 449     }
 450
 451     GLint program_length = 0;
 452     glGetProgramivARB(target, GL_PROGRAM_LENGTH_ARB, &program_length);
 453     if (!program_length) {
 454         return;
 455     }
 456
 457     GLchar *source = new GLchar[program_length + 1];
 458     source[0] = 0;
 459     glGetProgramStringARB(target, GL_PROGRAM_STRING_ARB, source);
 460     source[program_length] = 0;
 461
 462     json.beginMember(enumToString(target));
 463     json.writeString(source);
 464     json.endMember();
 465
 466     delete [] source;
 467 }
 468
 469
 470 static inline void
 471 dumpArbProgramUniforms(JSONWriter &json, GLenum target, const char *prefix)
 472 {
 473     if (!glIsEnabled(target)) {
 474         return;
 475     }
 476
 477     GLint program_parameters = 0;
 478     glGetProgramivARB(target, GL_PROGRAM_PARAMETERS_ARB, &program_parameters);
 479     if (!program_parameters) {
 480         return;
 481     }
 482
 483     GLint max_program_local_parameters = 0;
 484     glGetProgramivARB(target, GL_MAX_PROGRAM_LOCAL_PARAMETERS_ARB, &max_program_local_parameters);
 485     for (GLint index = 0; index < max_program_local_parameters; ++index) {
 486         GLdouble params[4] = {0, 0, 0, 0};
 487         glGetProgramLocalParameterdvARB(target, index, params);
 488
 489         if (!params[0] && !params[1] && !params[2] && !params[3]) {
 490             continue;
 491         }
 492
 493         char name[256];
 494         snprintf(name, sizeof name, "%sprogram.local[%i]", prefix, index);
 495
 496         json.beginMember(name);
 497         json.beginArray();
 498         json.writeNumber(params[0]);
 499         json.writeNumber(params[1]);
 500         json.writeNumber(params[2]);
 501         json.writeNumber(params[3]);
 502         json.endArray();
 503         json.endMember();
 504     }
 505
 506     GLint max_program_env_parameters = 0;
 507     glGetProgramivARB(target, GL_MAX_PROGRAM_ENV_PARAMETERS_ARB, &max_program_env_parameters);
 508     for (GLint index = 0; index < max_program_env_parameters; ++index) {
 509         GLdouble params[4] = {0, 0, 0, 0};
 510         glGetProgramEnvParameterdvARB(target, index, params);
 511
 512         if (!params[0] && !params[1] && !params[2] && !params[3]) {
 513             continue;
 514         }
 515
 516         char name[256];
 517         snprintf(name, sizeof name, "%sprogram.env[%i]", prefix, index);
 518
 519         json.beginMember(name);
 520         json.beginArray();
 521         json.writeNumber(params[0]);
 522         json.writeNumber(params[1]);
 523         json.writeNumber(params[2]);
 524         json.writeNumber(params[3]);
 525         json.endArray();
 526         json.endMember();
 527     }
 528 }
 529
 530
 531 static inline void
 532 dumpShadersUniforms(JSONWriter &json)
 533 {
 534     GLint program = 0;
 535     glGetIntegerv(GL_CURRENT_PROGRAM, &program);
 536
 537     GLhandleARB programObj = glGetHandleARB(GL_PROGRAM_OBJECT_ARB);
 538
 539     json.beginMember("shaders");
 540     json.beginObject();
 541     if (program) {
 542         dumpProgram(json, program);
 543     } else if (programObj) {
 544         dumpProgramObj(json, programObj);
 545     } else {
 546         dumpArbProgram(json, GL_FRAGMENT_PROGRAM_ARB);
 547         dumpArbProgram(json, GL_VERTEX_PROGRAM_ARB);
 548     }
 549     json.endObject();
 550     json.endMember(); // shaders
 551
 552     json.beginMember("uniforms");
 553     json.beginObject();
 554     if (program) {
 555         dumpProgramUniforms(json, program);
 556     } else if (programObj) {
 557         dumpProgramObjUniforms(json, programObj);
 558     } else {
 559         dumpArbProgramUniforms(json, GL_FRAGMENT_PROGRAM_ARB, "fp.");
 560         dumpArbProgramUniforms(json, GL_VERTEX_PROGRAM_ARB, "vp.");
 561     }
 562     json.endObject();
 563     json.endMember(); // uniforms
 564 }
 565
 566
 567 static inline void
 568 dumpTextureImage(JSONWriter &json, GLenum target, GLint level)
 569 {
 570     GLint width, height = 1, depth = 1;
 571     GLint format;
 572
 573     glGetTexLevelParameteriv(target, level, GL_TEXTURE_INTERNAL_FORMAT, &format);
 574
 575     width = 0;
 576     glGetTexLevelParameteriv(target, level, GL_TEXTURE_WIDTH, &width);
 577
 578     if (target != GL_TEXTURE_1D) {
 579         height = 0;
 580         glGetTexLevelParameteriv(target, level, GL_TEXTURE_HEIGHT, &height);
 581         if (target == GL_TEXTURE_3D) {
 582             depth = 0;
 583             glGetTexLevelParameteriv(target, level, GL_TEXTURE_DEPTH, &depth);
 584         }
 585     }
 586
 587     if (width <= 0 || height <= 0 || depth <= 0) {
 588         return;
 589     } else {
 590         char label[512];
 591
 592         GLint active_texture = GL_TEXTURE0;
 593         glGetIntegerv(GL_ACTIVE_TEXTURE, &active_texture);
 594         snprintf(label, sizeof label, "%s, %s, level = %d",
 595                  enumToString(active_texture), enumToString(target), level);
 596
 597         json.beginMember(label);
 598
 599         json.beginObject();
 600
 601         // Tell the GUI this is no ordinary object, but an image
 602         json.writeStringMember("__class__", "image");
 603
 604         json.writeNumberMember("__width__", width);
 605         json.writeNumberMember("__height__", height);
 606         json.writeNumberMember("__depth__", depth);
 607
 608         json.writeStringMember("__format__", enumToString(format));
 609
 610         // Hardcoded for now, but we could chose types more adequate to the
 611         // texture internal format
 612         json.writeStringMember("__type__", "uint8");
 613         json.writeBoolMember("__normalized__", true);
 614         json.writeNumberMember("__channels__", 4);
 615
 616         GLubyte *pixels = new GLubyte[depth*width*height*4];
 617
 618         resetPixelPackState();
 619
 620         glGetTexImage(target, level, GL_RGBA, GL_UNSIGNED_BYTE, pixels);
 621
 622         restorePixelPackState();
 623
 624         json.beginMember("__data__");
 625         char *pngBuffer;
 626         int pngBufferSize;
 627         image::writePixelsToBuffer(pixels, width, height, 4, true, &pngBuffer, &pngBufferSize);
 628         json.writeBase64(pngBuffer, pngBufferSize);
 629         free(pngBuffer);
 630         json.endMember(); // __data__
 631
 632         delete [] pixels;
 633         json.endObject();
 634     }
 635 }
 636
 637
 638 static inline void
 639 dumpTexture(JSONWriter &json, GLenum target, GLenum binding)
 640 {
 641     GLint texture_binding = 0;
 642     glGetIntegerv(binding, &texture_binding);
 643     if (!glIsEnabled(target) && !texture_binding) {
 644         return;
 645     }
 646
 647     GLint level = 0;
 648     do {
 649         GLint width = 0, height = 0;
 650         glGetTexLevelParameteriv(target, level, GL_TEXTURE_WIDTH, &width);
 651         glGetTexLevelParameteriv(target, level, GL_TEXTURE_HEIGHT, &height);
 652         if (!width || !height) {
 653             break;
 654         }
 655
 656         if (target == GL_TEXTURE_CUBE_MAP) {
 657             for (int face = 0; face < 6; ++face) {
 658                 dumpTextureImage(json, GL_TEXTURE_CUBE_MAP_POSITIVE_X + face, level);
 659             }
 660         } else {
 661             dumpTextureImage(json, target, level);
 662         }
 663
 664         ++level;
 665     } while(true);
 666 }
 667
 668
 669 static inline void
 670 dumpTextures(JSONWriter &json)
 671 {
 672     json.beginMember("textures");
 673     json.beginObject();
 674     GLint active_texture = GL_TEXTURE0;
 675     glGetIntegerv(GL_ACTIVE_TEXTURE, &active_texture);
 676     GLint max_texture_coords = 0;
 677     glGetIntegerv(GL_MAX_TEXTURE_COORDS, &max_texture_coords);
 678     GLint max_combined_texture_image_units = 0;
 679     glGetIntegerv(GL_MAX_COMBINED_TEXTURE_IMAGE_UNITS, &max_combined_texture_image_units);
 680     GLint max_units = std::max(max_combined_texture_image_units, max_texture_coords);
 681     for (GLint unit = 0; unit < max_units; ++unit) {
 682         GLenum texture = GL_TEXTURE0 + unit;
 683         glActiveTexture(texture);
 684         dumpTexture(json, GL_TEXTURE_1D, GL_TEXTURE_BINDING_1D);
 685         dumpTexture(json, GL_TEXTURE_2D, GL_TEXTURE_BINDING_2D);
 686         dumpTexture(json, GL_TEXTURE_3D, GL_TEXTURE_BINDING_3D);
 687         dumpTexture(json, GL_TEXTURE_RECTANGLE, GL_TEXTURE_BINDING_RECTANGLE);
 688         dumpTexture(json, GL_TEXTURE_CUBE_MAP, GL_TEXTURE_BINDING_CUBE_MAP);
 689     }
 690     glActiveTexture(active_texture);
 691     json.endObject();
 692     json.endMember(); // textures
 693 }
 694
 695
 696 static bool
 697 getDrawableBounds(GLint *width, GLint *height) {
 698 #if defined(_WIN32)
 699
 700     HDC hDC = wglGetCurrentDC();
 701     if (!hDC) {
 702         return false;
 703     }
 704
 705     HWND hWnd = WindowFromDC(hDC);
 706     RECT rect;
 707
 708     if (!GetClientRect(hWnd, &rect)) {
 709        return false;
 710     }
 711
 712     *width  = rect.right  - rect.left;
 713     *height = rect.bottom - rect.top;
 714
 715 #elif defined(__APPLE__)
 716
 717     CGLContextObj ctx = CGLGetCurrentContext();
 718     if (ctx == NULL) {
 719         return false;
 720     }
 721
 722     CGSConnectionID cid;
 723     CGSWindowID wid;
 724     CGSSurfaceID sid;
 725
 726     if (CGLGetSurface(ctx, &cid, &wid, &sid) != kCGLNoError) {
 727         return false;
 728     }
 729
 730     CGRect rect;
 731
 732     if (CGSGetSurfaceBounds(cid, wid, sid, &rect) != 0) {
 733         return false;
 734     }
 735
 736     *width = rect.size.width;
 737     *height = rect.size.height;
 738
 739 #else
 740
 741     Display *display;
 742     Drawable drawable;
 743     Window root;
 744     int x, y;
 745     unsigned int w, h, bw, depth;
 746
 747     display = glXGetCurrentDisplay();
 748     if (!display) {
 749         return false;
 750     }
 751
 752     drawable = glXGetCurrentDrawable();
 753     if (drawable == None) {
 754         return false;
 755     }
 756
 757     if (!XGetGeometry(display, drawable, &root, &x, &y, &w, &h, &bw, &depth)) {
 758         return false;
 759     }
 760
 761     *width = w;
 762     *height = h;
 763
 764 #endif
 765
 766     return true;
 767 }
 768
 769
 770 static const GLenum texture_bindings[][2] = {
 771     {GL_TEXTURE_1D, GL_TEXTURE_BINDING_1D},
 772     {GL_TEXTURE_2D, GL_TEXTURE_BINDING_2D},
 773     {GL_TEXTURE_3D, GL_TEXTURE_BINDING_3D},
 774     {GL_TEXTURE_RECTANGLE, GL_TEXTURE_BINDING_RECTANGLE},
 775     {GL_TEXTURE_CUBE_MAP, GL_TEXTURE_BINDING_CUBE_MAP}
 776 };
 777
 778
 779 static bool
 780 bindTexture(GLint texture, GLenum &target, GLint &bound_texture)
 781 {
 782
 783     for (unsigned i = 0; i < sizeof(texture_bindings)/sizeof(texture_bindings[0]); ++i) {
 784         target  = texture_bindings[i][0];
 785
 786         GLenum binding = texture_bindings[i][1];
 787
 788         while (glGetError() != GL_NO_ERROR)
 789             ;
 790
 791         glGetIntegerv(binding, &bound_texture);
 792         glBindTexture(target, texture);
 793
 794         if (glGetError() == GL_NO_ERROR) {
 795             return true;
 796         }
 797
 798         glBindTexture(target, bound_texture);
 799     }
 800
 801     target = GL_NONE;
 802
 803     return false;
 804 }
 805
 806
 807 static bool
 808 getTextureLevelSize(GLint texture, GLint level, GLint *width, GLint *height)
 809 {
 810     *width = 0;
 811     *height = 0;
 812
 813     GLenum target;
 814     GLint bound_texture = 0;
 815     if (!bindTexture(texture, target, bound_texture)) {
 816         return false;
 817     }
 818
 819     glGetTexLevelParameteriv(target, level, GL_TEXTURE_WIDTH, width);
 820     glGetTexLevelParameteriv(target, level, GL_TEXTURE_HEIGHT, height);
 821
 822     glBindTexture(target, bound_texture);
 823
 824     return *width > 0 && *height > 0;
 825 }
 826
 827
 828 static GLint
 829 getTextureLevelFormat(GLint texture, GLint level)
 830 {
 831     GLenum target;
 832     GLint bound_texture = 0;
 833     if (!bindTexture(texture, target, bound_texture)) {
 834         return GL_NONE;
 835     }
 836
 837     GLint format = GL_NONE;
 838     glGetTexLevelParameteriv(target, level, GL_TEXTURE_INTERNAL_FORMAT, &format);
 839
 840     glBindTexture(target, bound_texture);
 841
 842     return format;
 843 }
 844
 845
 846
 847 static bool
 848 getRenderbufferSize(GLint renderbuffer, GLint *width, GLint *height)
 849 {
 850     GLint bound_renderbuffer = 0;
 851     glGetIntegerv(GL_RENDERBUFFER_BINDING, &bound_renderbuffer);
 852     glBindRenderbuffer(GL_RENDERBUFFER, renderbuffer);
 853
 854     *width = 0;
 855     *height = 0;
 856     glGetRenderbufferParameteriv(GL_RENDERBUFFER, GL_RENDERBUFFER_WIDTH, width);
 857     glGetRenderbufferParameteriv(GL_RENDERBUFFER, GL_RENDERBUFFER_HEIGHT, height);
 858
 859     glBindRenderbuffer(GL_RENDERBUFFER, bound_renderbuffer);
 860
 861     return *width > 0 && *height > 0;
 862 }
 863
 864
 865 static bool
 866 getFramebufferAttachmentSize(GLenum target, GLenum attachment, GLint *width, GLint *height)
 867 {
 868     GLint object_type = GL_NONE;
 869     glGetFramebufferAttachmentParameteriv(target, attachment,
 870                                           GL_FRAMEBUFFER_ATTACHMENT_OBJECT_TYPE,
 871                                           &object_type);
 872     if (object_type == GL_NONE) {
 873         return false;
 874     }
 875
 876     GLint object_name = 0;
 877     glGetFramebufferAttachmentParameteriv(target, attachment,
 878                                           GL_FRAMEBUFFER_ATTACHMENT_OBJECT_NAME,
 879                                           &object_name);
 880     if (object_name == 0) {
 881         return false;
 882     }
 883
 884     if (object_type == GL_RENDERBUFFER) {
 885         return getRenderbufferSize(object_name, width, height);
 886     } else if (object_type == GL_TEXTURE) {
 887         GLint texture_level = 0;
 888         glGetFramebufferAttachmentParameteriv(target, attachment,
 889                                               GL_FRAMEBUFFER_ATTACHMENT_TEXTURE_LEVEL,
 890                                               &texture_level);
 891         return getTextureLevelSize(object_name, texture_level, width, height);
 892     } else {
 893         std::cerr << "warning: unexpected GL_FRAMEBUFFER_ATTACHMENT_OBJECT_TYPE = " << object_type << "\n";
 894         return false;
 895     }
 896 }
 897
 898
 899
 900 static GLint
 901 getFramebufferAttachmentFormat(GLenum target, GLenum attachment)
 902 {
 903     GLint object_type = GL_NONE;
 904     glGetFramebufferAttachmentParameteriv(target, attachment,
 905                                           GL_FRAMEBUFFER_ATTACHMENT_OBJECT_TYPE,
 906                                           &object_type);
 907     if (object_type == GL_NONE) {
 908         return GL_NONE;
 909     }
 910
 911     GLint object_name = 0;
 912     glGetFramebufferAttachmentParameteriv(target, attachment,
 913                                           GL_FRAMEBUFFER_ATTACHMENT_OBJECT_NAME,
 914                                           &object_name);
 915     if (object_name == 0) {
 916         return GL_NONE;
 917     }
 918
 919     if (object_type == GL_RENDERBUFFER) {
 920         GLint format = GL_NONE;
 921         glGetRenderbufferParameteriv(object_name, GL_RENDERBUFFER_INTERNAL_FORMAT,
 922                                      &format);
 923         return format;
 924     } else if (object_type == GL_TEXTURE) {
 925         GLint texture_level = 0;
 926         glGetFramebufferAttachmentParameteriv(target, attachment,
 927                                               GL_FRAMEBUFFER_ATTACHMENT_TEXTURE_LEVEL,
 928                                               &texture_level);
 929
 930         GLint format = getTextureLevelFormat(object_name, texture_level);
 931         return format;
 932     } else {
 933         std::cerr << "warning: unexpected GL_FRAMEBUFFER_ATTACHMENT_OBJECT_TYPE = " << object_type << "\n";
 934         return GL_NONE;
 935     }
 936 }
 937
 938
 939
 940 image::Image *
 941 getDrawBufferImage(GLenum format) {
 942     GLint channels = __gl_format_channels(format);
 943     if (channels > 4) {
 944         return NULL;
 945     }
 946
 947     GLint draw_framebuffer = 0;
 948     glGetIntegerv(GL_DRAW_FRAMEBUFFER_BINDING, &draw_framebuffer);
 949
 950     GLint draw_buffer = GL_NONE;
 951     GLint width, height;
 952     if (draw_framebuffer) {
 953         glGetIntegerv(GL_DRAW_BUFFER0, &draw_buffer);
 954         if (draw_buffer == GL_NONE) {
 955             return NULL;
 956         }
 957
 958         if (!getFramebufferAttachmentSize(GL_DRAW_FRAMEBUFFER, draw_buffer, &width, &height)) {
 959             return NULL;
 960         }
 961     } else {
 962         glGetIntegerv(GL_DRAW_BUFFER, &draw_buffer);
 963         if (draw_buffer == GL_NONE) {
 964             return NULL;
 965         }
 966
 967         if (!getDrawableBounds(&width, &height)) {
 968             return NULL;
 969         }
 970     }
 971
 972     image::Image *image = new image::Image(width, height, channels, true);
 973     if (!image) {
 974         return NULL;
 975     }
 976
 977     while (glGetError() != GL_NO_ERROR) {}
 978
 979     GLint read_framebuffer = 0;
 980     glGetIntegerv(GL_READ_FRAMEBUFFER_BINDING, &read_framebuffer);
 981     glBindFramebuffer(GL_READ_FRAMEBUFFER, draw_framebuffer);
 982
 983     GLint read_buffer = 0;
 984     glGetIntegerv(GL_READ_BUFFER, &read_buffer);
 985     glReadBuffer(draw_buffer);
 986
 987     // TODO: reset imaging state too
 988     resetPixelPackState();
 989
 990     glReadPixels(0, 0, width, height, format, GL_UNSIGNED_BYTE, image->pixels);
 991
 992     restorePixelPackState();
 993     glReadBuffer(read_buffer);
 994     glBindFramebuffer(GL_READ_FRAMEBUFFER, read_framebuffer);
 995
 996     GLenum error = glGetError();
 997     if (error != GL_NO_ERROR) {
 998         do {
 999             std::cerr << "warning: " << enumToString(error) << " while getting snapshot\n";
1000             error = glGetError();
1001         } while(error != GL_NO_ERROR);
1002         delete image;
1003         return NULL;
1004     }
1005
1006     return image;
1007 }
1008
1009
1010 /**
1011  * Dump the image of the currently bound read buffer.
1012  */
1013 static inline void
1014 dumpReadBufferImage(JSONWriter &json, GLint width, GLint height, GLenum format,
1015                     GLint internalFormat = GL_NONE)
1016 {
1017     GLint channels = __gl_format_channels(format);
1018
1019     json.beginObject();
1020
1021     // Tell the GUI this is no ordinary object, but an image
1022     json.writeStringMember("__class__", "image");
1023
1024     json.writeNumberMember("__width__", width);
1025     json.writeNumberMember("__height__", height);
1026     json.writeNumberMember("__depth__", 1);
1027
1028     json.writeStringMember("__format__", enumToString(internalFormat));
1029
1030     // Hardcoded for now, but we could chose types more adequate to the
1031     // texture internal format
1032     json.writeStringMember("__type__", "uint8");
1033     json.writeBoolMember("__normalized__", true);
1034     json.writeNumberMember("__channels__", channels);
1035
1036     GLubyte *pixels = new GLubyte[width*height*channels];
1037
1038     // TODO: reset imaging state too
1039     resetPixelPackState();
1040
1041     glReadPixels(0, 0, width, height, format, GL_UNSIGNED_BYTE, pixels);
1042
1043     restorePixelPackState();
1044
1045     json.beginMember("__data__");
1046     char *pngBuffer;
1047     int pngBufferSize;
1048     image::writePixelsToBuffer(pixels, width, height, channels, true, &pngBuffer, &pngBufferSize);
1049     //std::cerr <<" Before = "<<(width * height * channels * sizeof *pixels)
1050     //          <<", after = "<<pngBufferSize << ", ratio = " << double(width * height * channels * sizeof *pixels)/pngBufferSize;
1051     json.writeBase64(pngBuffer, pngBufferSize);
1052     free(pngBuffer);
1053     json.endMember(); // __data__
1054
1055     delete [] pixels;
1056     json.endObject();
1057 }
1058
1059
1060 static inline GLuint
1061 downsampledFramebuffer(GLuint oldFbo, GLint drawbuffer,
1062                        GLint colorRb, GLint depthRb, GLint stencilRb,
1063                        GLuint *rbs, GLint *numRbs)
1064 {
1065     GLuint fbo;
1066     GLint format;
1067     GLint w, h;
1068
1069     *numRbs = 0;
1070
1071     glGenFramebuffers(1, &fbo);
1072     glBindFramebuffer(GL_FRAMEBUFFER, fbo);
1073
1074     glBindRenderbuffer(GL_RENDERBUFFER, colorRb);
1075     glGetRenderbufferParameteriv(GL_RENDERBUFFER,
1076                                  GL_RENDERBUFFER_WIDTH, &w);
1077     glGetRenderbufferParameteriv(GL_RENDERBUFFER,
1078                                  GL_RENDERBUFFER_HEIGHT, &h);
1079     glGetRenderbufferParameteriv(GL_RENDERBUFFER,
1080                                  GL_RENDERBUFFER_INTERNAL_FORMAT, &format);
1081
1082     glGenRenderbuffers(1, &rbs[*numRbs]);
1083     glBindRenderbuffer(GL_RENDERBUFFER, rbs[*numRbs]);
1084     glRenderbufferStorage(GL_RENDERBUFFER, format, w, h);
1085     glFramebufferRenderbuffer(GL_FRAMEBUFFER, drawbuffer,
1086                               GL_RENDERBUFFER, rbs[*numRbs]);
1087
1088     glBindFramebuffer(GL_READ_FRAMEBUFFER, oldFbo);
1089     glBindFramebuffer(GL_DRAW_FRAMEBUFFER, fbo);
1090     glDrawBuffer(drawbuffer);
1091     glReadBuffer(drawbuffer);
1092     glBlitFramebuffer(0, 0, w, h, 0, 0, w, h,
1093                       GL_COLOR_BUFFER_BIT, GL_NEAREST);
1094     glBindFramebuffer(GL_FRAMEBUFFER, fbo);
1095     ++*numRbs;
1096
1097     if (stencilRb == depthRb && stencilRb) {
1098         //combined depth and stencil buffer
1099         glBindRenderbuffer(GL_RENDERBUFFER, depthRb);
1100         glGetRenderbufferParameteriv(GL_RENDERBUFFER,
1101                                      GL_RENDERBUFFER_WIDTH, &w);
1102         glGetRenderbufferParameteriv(GL_RENDERBUFFER,
1103                                      GL_RENDERBUFFER_HEIGHT, &h);
1104         glGetRenderbufferParameteriv(GL_RENDERBUFFER,
1105                                      GL_RENDERBUFFER_INTERNAL_FORMAT, &format);
1106
1107         glGenRenderbuffers(1, &rbs[*numRbs]);
1108         glBindRenderbuffer(GL_RENDERBUFFER, rbs[*numRbs]);
1109         glRenderbufferStorage(GL_RENDERBUFFER, format, w, h);
1110         glFramebufferRenderbuffer(GL_FRAMEBUFFER, GL_DEPTH_STENCIL_ATTACHMENT,
1111                                   GL_RENDERBUFFER, rbs[*numRbs]);
1112         glBindFramebuffer(GL_READ_FRAMEBUFFER, oldFbo);
1113         glBindFramebuffer(GL_DRAW_FRAMEBUFFER, fbo);
1114         glBlitFramebuffer(0, 0, w, h, 0, 0, w, h,
1115                           GL_DEPTH_BUFFER_BIT | GL_STENCIL_BUFFER_BIT, GL_NEAREST);
1116         glBindFramebuffer(GL_FRAMEBUFFER, fbo);
1117         ++*numRbs;
1118     } else {
1119         if (depthRb) {
1120             glBindRenderbuffer(GL_RENDERBUFFER, depthRb);
1121             glGetRenderbufferParameteriv(GL_RENDERBUFFER,
1122                                          GL_RENDERBUFFER_WIDTH, &w);
1123             glGetRenderbufferParameteriv(GL_RENDERBUFFER,
1124                                          GL_RENDERBUFFER_HEIGHT, &h);
1125             glGetRenderbufferParameteriv(GL_RENDERBUFFER,
1126                                          GL_RENDERBUFFER_INTERNAL_FORMAT, &format);
1127
1128             glGenRenderbuffers(1, &rbs[*numRbs]);
1129             glBindRenderbuffer(GL_RENDERBUFFER, rbs[*numRbs]);
1130             glRenderbufferStorage(GL_RENDERBUFFER, format, w, h);
1131             glFramebufferRenderbuffer(GL_FRAMEBUFFER,
1132                                       GL_DEPTH_ATTACHMENT,
1133                                       GL_RENDERBUFFER, rbs[*numRbs]);
1134             glBindFramebuffer(GL_READ_FRAMEBUFFER, oldFbo);
1135             glBindFramebuffer(GL_DRAW_FRAMEBUFFER, fbo);
1136             glDrawBuffer(GL_DEPTH_ATTACHMENT);
1137             glReadBuffer(GL_DEPTH_ATTACHMENT);
1138             glBlitFramebuffer(0, 0, w, h, 0, 0, w, h,
1139                               GL_DEPTH_BUFFER_BIT, GL_NEAREST);
1140             ++*numRbs;
1141         }
1142         if (stencilRb) {
1143             glBindRenderbuffer(GL_RENDERBUFFER, stencilRb);
1144             glGetRenderbufferParameteriv(GL_RENDERBUFFER,
1145                                          GL_RENDERBUFFER_WIDTH, &w);
1146             glGetRenderbufferParameteriv(GL_RENDERBUFFER,
1147                                          GL_RENDERBUFFER_HEIGHT, &h);
1148             glGetRenderbufferParameteriv(GL_RENDERBUFFER,
1149                                      GL_RENDERBUFFER_INTERNAL_FORMAT, &format);
1150
1151             glGenRenderbuffers(1, &rbs[*numRbs]);
1152             glBindRenderbuffer(GL_RENDERBUFFER, rbs[*numRbs]);
1153             glRenderbufferStorage(GL_RENDERBUFFER, format, w, h);
1154             glFramebufferRenderbuffer(GL_FRAMEBUFFER,
1155                                       GL_STENCIL_ATTACHMENT,
1156                                       GL_RENDERBUFFER, rbs[*numRbs]);
1157             glBindFramebuffer(GL_READ_FRAMEBUFFER, oldFbo);
1158             glBindFramebuffer(GL_DRAW_FRAMEBUFFER, fbo);
1159             glDrawBuffer(GL_STENCIL_ATTACHMENT);
1160             glReadBuffer(GL_STENCIL_ATTACHMENT);
1161             glBlitFramebuffer(0, 0, w, h, 0, 0, w, h,
1162                               GL_STENCIL_BUFFER_BIT, GL_NEAREST);
1163             ++*numRbs;
1164         }
1165     }
1166
1167     return fbo;
1168 }
1169
1170
1171 /**
1172  * Dump images of current draw drawable/window.
1173  */
1174 static void
1175 dumpDrawableImages(JSONWriter &json)
1176 {
1177     GLint width, height;
1178
1179     if (!getDrawableBounds(&width, &height)) {
1180         return;
1181     }
1182
1183     GLint draw_buffer = GL_NONE;
1184     glGetIntegerv(GL_DRAW_BUFFER, &draw_buffer);
1185     glReadBuffer(draw_buffer);
1186
1187     if (draw_buffer != GL_NONE) {
1188         GLint read_buffer = GL_NONE;
1189         glGetIntegerv(GL_READ_BUFFER, &read_buffer);
1190
1191         GLint alpha_bits = 0;
1192         glGetIntegerv(GL_ALPHA_BITS, &alpha_bits);
1193         GLenum format = alpha_bits ? GL_RGBA : GL_RGB;
1194         json.beginMember(enumToString(draw_buffer));
1195         dumpReadBufferImage(json, width, height, format);
1196         json.endMember();
1197
1198         glReadBuffer(read_buffer);
1199     }
1200
1201     GLint depth_bits = 0;
1202     glGetIntegerv(GL_DEPTH_BITS, &depth_bits);
1203     if (depth_bits) {
1204         json.beginMember("GL_DEPTH_COMPONENT");
1205         dumpReadBufferImage(json, width, height, GL_DEPTH_COMPONENT);
1206         json.endMember();
1207     }
1208
1209     GLint stencil_bits = 0;
1210     glGetIntegerv(GL_STENCIL_BITS, &stencil_bits);
1211     if (stencil_bits) {
1212         json.beginMember("GL_STENCIL_INDEX");
1213         dumpReadBufferImage(json, width, height, GL_STENCIL_INDEX);
1214         json.endMember();
1215     }
1216 }
1217 /**
1218  * Dump the specified framebuffer attachment.
1219  *
1220  * In the case of a color attachment, it assumes it is already bound for read.
1221  */
1222 static void
1223 dumpFramebufferAttachment(JSONWriter &json, GLenum target, GLenum attachment, GLenum format)
1224 {
1225     GLint width = 0, height = 0;
1226     if (!getFramebufferAttachmentSize(target, attachment, &width, &height)) {
1227         return;
1228     }
1229
1230     GLint internalFormat = getFramebufferAttachmentFormat(target, attachment);
1231
1232     json.beginMember(enumToString(attachment));
1233     dumpReadBufferImage(json, width, height, format, internalFormat);
1234     json.endMember();
1235 }
1236
1237
1238 static void
1239 dumpFramebufferAttachments(JSONWriter &json, GLenum target)
1240 {
1241     GLint read_framebuffer = 0;
1242     glGetIntegerv(GL_READ_FRAMEBUFFER_BINDING, &read_framebuffer);
1243
1244     GLint read_buffer = GL_NONE;
1245     glGetIntegerv(GL_READ_BUFFER, &read_buffer);
1246
1247     GLint max_draw_buffers = 1;
1248     glGetIntegerv(GL_MAX_DRAW_BUFFERS, &max_draw_buffers);
1249     GLint max_color_attachments = 0;
1250     glGetIntegerv(GL_MAX_COLOR_ATTACHMENTS, &max_color_attachments);
1251
1252     for (GLint i = 0; i < max_draw_buffers; ++i) {
1253         GLint draw_buffer = GL_NONE;
1254         glGetIntegerv(GL_DRAW_BUFFER0 + i, &draw_buffer);
1255         if (draw_buffer != GL_NONE) {
1256             glReadBuffer(draw_buffer);
1257             GLint attachment;
1258             if (draw_buffer >= GL_COLOR_ATTACHMENT0 && draw_buffer < GL_COLOR_ATTACHMENT0 + max_color_attachments) {
1259                 attachment = draw_buffer;
1260             } else {
1261                 std::cerr << "warning: unexpected GL_DRAW_BUFFER" << i << " = " << draw_buffer << "\n";
1262                 attachment = GL_COLOR_ATTACHMENT0;
1263             }
1264             GLint alpha_size = 0;
1265             glGetFramebufferAttachmentParameteriv(target, attachment,
1266                                                   GL_FRAMEBUFFER_ATTACHMENT_ALPHA_SIZE,
1267                                                   &alpha_size);
1268             GLenum format = alpha_size ? GL_RGBA : GL_RGB;
1269             dumpFramebufferAttachment(json, target, attachment, format);
1270         }
1271     }
1272
1273     glReadBuffer(read_buffer);
1274
1275     dumpFramebufferAttachment(json, target, GL_DEPTH_ATTACHMENT, GL_DEPTH_COMPONENT);
1276     dumpFramebufferAttachment(json, target, GL_STENCIL_ATTACHMENT, GL_STENCIL_INDEX);
1277
1278     glBindFramebuffer(GL_READ_FRAMEBUFFER, read_framebuffer);
1279 }
1280
1281
1282 static void
1283 dumpFramebuffer(JSONWriter &json)
1284 {
1285     json.beginMember("framebuffer");
1286     json.beginObject();
1287
1288     GLint boundDrawFbo = 0, boundReadFbo = 0;
1289     glGetIntegerv(GL_DRAW_FRAMEBUFFER_BINDING, &boundDrawFbo);
1290     glGetIntegerv(GL_READ_FRAMEBUFFER_BINDING, &boundReadFbo);
1291     if (!boundDrawFbo) {
1292         dumpDrawableImages(json);
1293     } else {
1294         GLint colorRb = 0, stencilRb = 0, depthRb = 0;
1295         GLint draw_buffer0 = GL_NONE;
1296         glGetIntegerv(GL_DRAW_BUFFER0, &draw_buffer0);
1297         bool multisample = false;
1298
1299         GLint boundRb = 0;
1300         glGetIntegerv(GL_RENDERBUFFER_BINDING, &boundRb);
1301
1302         GLint object_type;
1303         glGetFramebufferAttachmentParameteriv(GL_DRAW_FRAMEBUFFER, draw_buffer0, GL_FRAMEBUFFER_ATTACHMENT_OBJECT_TYPE, &object_type);
1304         if (object_type == GL_RENDERBUFFER) {
1305             glGetFramebufferAttachmentParameteriv(GL_DRAW_FRAMEBUFFER, draw_buffer0, GL_FRAMEBUFFER_ATTACHMENT_OBJECT_NAME, &colorRb);
1306             glBindRenderbuffer(GL_RENDERBUFFER, colorRb);
1307             GLint samples = 0;
1308             glGetRenderbufferParameteriv(GL_RENDERBUFFER, GL_RENDERBUFFER_SAMPLES, &samples);
1309             if (samples) {
1310                 multisample = true;
1311             }
1312         }
1313
1314         glGetFramebufferAttachmentParameteriv(GL_DRAW_FRAMEBUFFER, GL_DEPTH_ATTACHMENT, GL_FRAMEBUFFER_ATTACHMENT_OBJECT_TYPE, &object_type);
1315         if (object_type == GL_RENDERBUFFER) {
1316             glGetFramebufferAttachmentParameteriv(GL_DRAW_FRAMEBUFFER, GL_DEPTH_ATTACHMENT, GL_FRAMEBUFFER_ATTACHMENT_OBJECT_NAME, &depthRb);
1317             glBindRenderbuffer(GL_RENDERBUFFER, depthRb);
1318             GLint samples = 0;
1319             glGetRenderbufferParameteriv(GL_RENDERBUFFER, GL_RENDERBUFFER_SAMPLES, &samples);
1320             if (samples) {
1321                 multisample = true;
1322             }
1323         }
1324
1325         glGetFramebufferAttachmentParameteriv(GL_DRAW_FRAMEBUFFER, GL_STENCIL_ATTACHMENT, GL_FRAMEBUFFER_ATTACHMENT_OBJECT_TYPE, &object_type);
1326         if (object_type == GL_RENDERBUFFER) {
1327             glGetFramebufferAttachmentParameteriv(GL_DRAW_FRAMEBUFFER, GL_STENCIL_ATTACHMENT, GL_FRAMEBUFFER_ATTACHMENT_OBJECT_NAME, &stencilRb);
1328             glBindRenderbuffer(GL_RENDERBUFFER, stencilRb);
1329             GLint samples = 0;
1330             glGetRenderbufferParameteriv(GL_RENDERBUFFER, GL_RENDERBUFFER_SAMPLES, &samples);
1331             if (samples) {
1332                 multisample = true;
1333             }
1334         }
1335
1336         glBindRenderbuffer(GL_RENDERBUFFER, boundRb);
1337
1338         GLuint rbs[3];
1339         GLint numRbs = 0;
1340         GLuint fboCopy = 0;
1341
1342         if (multisample) {
1343             // glReadPixels doesnt support multisampled buffers so we need
1344             // to blit the fbo to a temporary one
1345             fboCopy = downsampledFramebuffer(boundDrawFbo, draw_buffer0,
1346                                              colorRb, depthRb, stencilRb,
1347                                              rbs, &numRbs);
1348         }
1349
1350         dumpFramebufferAttachments(json, GL_DRAW_FRAMEBUFFER);
1351
1352         if (multisample) {
1353             glBindRenderbuffer(GL_RENDERBUFFER_BINDING, boundRb);
1354             glDeleteRenderbuffers(numRbs, rbs);
1355             glDeleteFramebuffers(1, &fboCopy);
1356         }
1357
1358         glBindFramebuffer(GL_READ_FRAMEBUFFER, boundReadFbo);
1359         glBindFramebuffer(GL_DRAW_FRAMEBUFFER, boundDrawFbo);
1360     }
1361
1362     json.endObject();
1363     json.endMember(); // framebuffer
1364 }
1365
1366
1367 static const GLenum bindings[] = {
1368     GL_DRAW_BUFFER,
1369     GL_READ_BUFFER,
1370     GL_PIXEL_PACK_BUFFER_BINDING,
1371     GL_PIXEL_UNPACK_BUFFER_BINDING,
1372     GL_TEXTURE_BINDING_1D,
1373     GL_TEXTURE_BINDING_2D,
1374     GL_TEXTURE_BINDING_3D,
1375     GL_TEXTURE_BINDING_RECTANGLE,
1376     GL_TEXTURE_BINDING_CUBE_MAP,
1377     GL_DRAW_FRAMEBUFFER_BINDING,
1378     GL_READ_FRAMEBUFFER_BINDING,
1379     GL_RENDERBUFFER_BINDING,
1380     GL_DRAW_BUFFER0,
1381     GL_DRAW_BUFFER1,
1382     GL_DRAW_BUFFER2,
1383     GL_DRAW_BUFFER3,
1384     GL_DRAW_BUFFER4,
1385     GL_DRAW_BUFFER5,
1386     GL_DRAW_BUFFER6,
1387     GL_DRAW_BUFFER7,
1388 };
1389
1390
1391 #define NUM_BINDINGS sizeof(bindings)/sizeof(bindings[0])
1392
1393
1394 void dumpCurrentContext(std::ostream &os)
1395 {
1396     JSONWriter json(os);
1397
1398 #ifndef NDEBUG
1399     GLint old_bindings[NUM_BINDINGS];
1400     for (unsigned i = 0; i < NUM_BINDINGS; ++i) {
1401         old_bindings[i] = 0;
1402         glGetIntegerv(bindings[i], &old_bindings[i]);
1403     }
1404 #endif
1405
1406     dumpParameters(json);
1407     dumpShadersUniforms(json);
1408     dumpTextures(json);
1409     dumpFramebuffer(json);
1410
1411 #ifndef NDEBUG
1412     for (unsigned i = 0; i < NUM_BINDINGS; ++i) {
1413         GLint new_binding = 0;
1414         glGetIntegerv(bindings[i], &new_binding);
1415         if (new_binding != old_bindings[i]) {
1416             std::cerr << "warning: " << enumToString(bindings[i]) << " was clobbered\n";
1417         }
1418     }
1419 #endif
1420
1421 }
1422
1423
1424 } /* namespace glstate */