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, %s, %d level",
 595                  enumToString(active_texture), enumToString(target), enumToString(format), 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         // Hardcoded for now, but we could chose types more adequate to the
 609         // texture internal format
 610         json.writeStringMember("__type__", "uint8");
 611         json.writeBoolMember("__normalized__", true);
 612         json.writeNumberMember("__channels__", 4);
 613
 614         GLubyte *pixels = new GLubyte[depth*width*height*4];
 615
 616         resetPixelPackState();
 617
 618         glGetTexImage(target, level, GL_RGBA, GL_UNSIGNED_BYTE, pixels);
 619
 620         restorePixelPackState();
 621
 622         json.beginMember("__data__");
 623         char *pngBuffer;
 624         int pngBufferSize;
 625         image::writePixelsToBuffer(pixels, width, height, 4, true, &pngBuffer, &pngBufferSize);
 626         json.writeBase64(pngBuffer, pngBufferSize);
 627         free(pngBuffer);
 628         json.endMember(); // __data__
 629
 630         delete [] pixels;
 631         json.endObject();
 632     }
 633 }
 634
 635
 636 static inline void
 637 dumpTexture(JSONWriter &json, GLenum target, GLenum binding)
 638 {
 639     GLint texture_binding = 0;
 640     glGetIntegerv(binding, &texture_binding);
 641     if (!glIsEnabled(target) && !texture_binding) {
 642         return;
 643     }
 644
 645     GLint level = 0;
 646     do {
 647         GLint width = 0, height = 0;
 648         glGetTexLevelParameteriv(target, level, GL_TEXTURE_WIDTH, &width);
 649         glGetTexLevelParameteriv(target, level, GL_TEXTURE_HEIGHT, &height);
 650         if (!width || !height) {
 651             break;
 652         }
 653
 654         if (target == GL_TEXTURE_CUBE_MAP) {
 655             for (int face = 0; face < 6; ++face) {
 656                 dumpTextureImage(json, GL_TEXTURE_CUBE_MAP_POSITIVE_X + face, level);
 657             }
 658         } else {
 659             dumpTextureImage(json, target, level);
 660         }
 661
 662         ++level;
 663     } while(true);
 664 }
 665
 666
 667 static inline void
 668 dumpTextures(JSONWriter &json)
 669 {
 670     json.beginMember("textures");
 671     json.beginObject();
 672     GLint active_texture = GL_TEXTURE0;
 673     glGetIntegerv(GL_ACTIVE_TEXTURE, &active_texture);
 674     GLint max_texture_coords = 0;
 675     glGetIntegerv(GL_MAX_TEXTURE_COORDS, &max_texture_coords);
 676     GLint max_combined_texture_image_units = 0;
 677     glGetIntegerv(GL_MAX_COMBINED_TEXTURE_IMAGE_UNITS, &max_combined_texture_image_units);
 678     GLint max_units = std::max(max_combined_texture_image_units, max_texture_coords);
 679     for (GLint unit = 0; unit < max_units; ++unit) {
 680         GLenum texture = GL_TEXTURE0 + unit;
 681         glActiveTexture(texture);
 682         dumpTexture(json, GL_TEXTURE_1D, GL_TEXTURE_BINDING_1D);
 683         dumpTexture(json, GL_TEXTURE_2D, GL_TEXTURE_BINDING_2D);
 684         dumpTexture(json, GL_TEXTURE_3D, GL_TEXTURE_BINDING_3D);
 685         dumpTexture(json, GL_TEXTURE_RECTANGLE, GL_TEXTURE_BINDING_RECTANGLE);
 686         dumpTexture(json, GL_TEXTURE_CUBE_MAP, GL_TEXTURE_BINDING_CUBE_MAP);
 687     }
 688     glActiveTexture(active_texture);
 689     json.endObject();
 690     json.endMember(); // textures
 691 }
 692
 693
 694 static bool
 695 getDrawableBounds(GLint *width, GLint *height) {
 696 #if defined(_WIN32)
 697
 698     HDC hDC = wglGetCurrentDC();
 699     if (!hDC) {
 700         return false;
 701     }
 702
 703     HWND hWnd = WindowFromDC(hDC);
 704     RECT rect;
 705
 706     if (!GetClientRect(hWnd, &rect)) {
 707        return false;
 708     }
 709
 710     *width  = rect.right  - rect.left;
 711     *height = rect.bottom - rect.top;
 712
 713 #elif defined(__APPLE__)
 714
 715     CGLContextObj ctx = CGLGetCurrentContext();
 716     if (ctx == NULL) {
 717         return false;
 718     }
 719
 720     CGSConnectionID cid;
 721     CGSWindowID wid;
 722     CGSSurfaceID sid;
 723
 724     if (CGLGetSurface(ctx, &cid, &wid, &sid) != kCGLNoError) {
 725         return false;
 726     }
 727
 728     CGRect rect;
 729
 730     if (CGSGetSurfaceBounds(cid, wid, sid, &rect) != 0) {
 731         return false;
 732     }
 733
 734     *width = rect.size.width;
 735     *height = rect.size.height;
 736
 737 #else
 738
 739     Display *display;
 740     Drawable drawable;
 741     Window root;
 742     int x, y;
 743     unsigned int w, h, bw, depth;
 744
 745     display = glXGetCurrentDisplay();
 746     if (!display) {
 747         return false;
 748     }
 749
 750     drawable = glXGetCurrentDrawable();
 751     if (drawable == None) {
 752         return false;
 753     }
 754
 755     if (!XGetGeometry(display, drawable, &root, &x, &y, &w, &h, &bw, &depth)) {
 756         return false;
 757     }
 758
 759     *width = w;
 760     *height = h;
 761
 762 #endif
 763
 764     return true;
 765 }
 766
 767
 768 static const GLenum texture_bindings[][2] = {
 769     {GL_TEXTURE_1D, GL_TEXTURE_BINDING_1D},
 770     {GL_TEXTURE_2D, GL_TEXTURE_BINDING_2D},
 771     {GL_TEXTURE_3D, GL_TEXTURE_BINDING_3D},
 772     {GL_TEXTURE_RECTANGLE, GL_TEXTURE_BINDING_RECTANGLE},
 773     {GL_TEXTURE_CUBE_MAP, GL_TEXTURE_BINDING_CUBE_MAP}
 774 };
 775
 776
 777 static bool
 778 bindTexture(GLint texture, GLenum &target, GLint &bound_texture)
 779 {
 780
 781     for (unsigned i = 0; i < sizeof(texture_bindings)/sizeof(texture_bindings[0]); ++i) {
 782         target  = texture_bindings[i][0];
 783
 784         GLenum binding = texture_bindings[i][1];
 785
 786         while (glGetError() != GL_NO_ERROR)
 787             ;
 788
 789         glGetIntegerv(binding, &bound_texture);
 790         glBindTexture(target, texture);
 791
 792         if (glGetError() == GL_NO_ERROR) {
 793             return true;
 794         }
 795
 796         glBindTexture(target, bound_texture);
 797     }
 798
 799     target = GL_NONE;
 800
 801     return false;
 802 }
 803
 804
 805 static bool
 806 getTextureLevelSize(GLint texture, GLint level, GLint *width, GLint *height)
 807 {
 808     *width = 0;
 809     *height = 0;
 810
 811     GLenum target;
 812     GLint bound_texture = 0;
 813     if (!bindTexture(texture, target, bound_texture)) {
 814         return false;
 815     }
 816
 817     glGetTexLevelParameteriv(target, level, GL_TEXTURE_WIDTH, width);
 818     glGetTexLevelParameteriv(target, level, GL_TEXTURE_HEIGHT, height);
 819
 820     glBindTexture(target, bound_texture);
 821
 822     return *width > 0 && *height > 0;
 823 }
 824
 825
 826 static GLint
 827 getTextureLevelFormat(GLint texture, GLint level)
 828 {
 829     GLenum target;
 830     GLint bound_texture = 0;
 831     if (!bindTexture(texture, target, bound_texture)) {
 832         return GL_NONE;
 833     }
 834
 835     GLint format = GL_NONE;
 836     glGetTexLevelParameteriv(target, level, GL_TEXTURE_INTERNAL_FORMAT, &format);
 837
 838     glBindTexture(target, bound_texture);
 839
 840     return format;
 841 }
 842
 843
 844
 845 static bool
 846 getRenderbufferSize(GLint renderbuffer, GLint *width, GLint *height)
 847 {
 848     GLint bound_renderbuffer = 0;
 849     glGetIntegerv(GL_RENDERBUFFER_BINDING, &bound_renderbuffer);
 850     glBindRenderbuffer(GL_RENDERBUFFER, renderbuffer);
 851
 852     *width = 0;
 853     *height = 0;
 854     glGetRenderbufferParameteriv(GL_RENDERBUFFER, GL_RENDERBUFFER_WIDTH, width);
 855     glGetRenderbufferParameteriv(GL_RENDERBUFFER, GL_RENDERBUFFER_HEIGHT, height);
 856
 857     glBindRenderbuffer(GL_RENDERBUFFER, bound_renderbuffer);
 858
 859     return *width > 0 && *height > 0;
 860 }
 861
 862
 863 static bool
 864 getFramebufferAttachmentSize(GLenum target, GLenum attachment, GLint *width, GLint *height)
 865 {
 866     GLint object_type = GL_NONE;
 867     glGetFramebufferAttachmentParameteriv(target, attachment,
 868                                           GL_FRAMEBUFFER_ATTACHMENT_OBJECT_TYPE,
 869                                           &object_type);
 870     if (object_type == GL_NONE) {
 871         return false;
 872     }
 873
 874     GLint object_name = 0;
 875     glGetFramebufferAttachmentParameteriv(target, attachment,
 876                                           GL_FRAMEBUFFER_ATTACHMENT_OBJECT_NAME,
 877                                           &object_name);
 878     if (object_name == 0) {
 879         return false;
 880     }
 881
 882     if (object_type == GL_RENDERBUFFER) {
 883         return getRenderbufferSize(object_name, width, height);
 884     } else if (object_type == GL_TEXTURE) {
 885         GLint texture_level = 0;
 886         glGetFramebufferAttachmentParameteriv(target, attachment,
 887                                               GL_FRAMEBUFFER_ATTACHMENT_TEXTURE_LEVEL,
 888                                               &texture_level);
 889         return getTextureLevelSize(object_name, texture_level, width, height);
 890     } else {
 891         std::cerr << "warning: unexpected GL_FRAMEBUFFER_ATTACHMENT_OBJECT_TYPE = " << object_type << "\n";
 892         return false;
 893     }
 894 }
 895
 896
 897
 898 static GLint
 899 getFramebufferAttachmentFormat(GLenum target, GLenum attachment)
 900 {
 901     GLint object_type = GL_NONE;
 902     glGetFramebufferAttachmentParameteriv(target, attachment,
 903                                           GL_FRAMEBUFFER_ATTACHMENT_OBJECT_TYPE,
 904                                           &object_type);
 905     if (object_type == GL_NONE) {
 906         return GL_NONE;
 907     }
 908
 909     GLint object_name = 0;
 910     glGetFramebufferAttachmentParameteriv(target, attachment,
 911                                           GL_FRAMEBUFFER_ATTACHMENT_OBJECT_NAME,
 912                                           &object_name);
 913     if (object_name == 0) {
 914         return GL_NONE;
 915     }
 916
 917     if (object_type == GL_RENDERBUFFER) {
 918         GLint format = GL_NONE;
 919         glGetRenderbufferParameteriv(object_name, GL_RENDERBUFFER_INTERNAL_FORMAT,
 920                                      &format);
 921         return format;
 922     } else if (object_type == GL_TEXTURE) {
 923         GLint texture_level = 0;
 924         glGetFramebufferAttachmentParameteriv(target, attachment,
 925                                               GL_FRAMEBUFFER_ATTACHMENT_TEXTURE_LEVEL,
 926                                               &texture_level);
 927
 928         GLint format = getTextureLevelFormat(object_name, texture_level);
 929         return format;
 930     } else {
 931         std::cerr << "warning: unexpected GL_FRAMEBUFFER_ATTACHMENT_OBJECT_TYPE = " << object_type << "\n";
 932         return GL_NONE;
 933     }
 934 }
 935
 936
 937
 938 image::Image *
 939 getDrawBufferImage(GLenum format) {
 940     GLint channels = __gl_format_channels(format);
 941     if (channels > 4) {
 942         return NULL;
 943     }
 944
 945     GLint draw_framebuffer = 0;
 946     glGetIntegerv(GL_DRAW_FRAMEBUFFER_BINDING, &draw_framebuffer);
 947
 948     GLint draw_buffer = GL_NONE;
 949     GLint width, height;
 950     if (draw_framebuffer) {
 951         glGetIntegerv(GL_DRAW_BUFFER0, &draw_buffer);
 952         if (draw_buffer == GL_NONE) {
 953             return NULL;
 954         }
 955
 956         if (!getFramebufferAttachmentSize(GL_DRAW_FRAMEBUFFER, draw_buffer, &width, &height)) {
 957             return NULL;
 958         }
 959     } else {
 960         glGetIntegerv(GL_DRAW_BUFFER, &draw_buffer);
 961         if (draw_buffer == GL_NONE) {
 962             return NULL;
 963         }
 964
 965         if (!getDrawableBounds(&width, &height)) {
 966             return NULL;
 967         }
 968     }
 969
 970     image::Image *image = new image::Image(width, height, channels, true);
 971     if (!image) {
 972         return NULL;
 973     }
 974
 975     while (glGetError() != GL_NO_ERROR) {}
 976
 977     GLint read_framebuffer = 0;
 978     glGetIntegerv(GL_READ_FRAMEBUFFER_BINDING, &read_framebuffer);
 979     glBindFramebuffer(GL_READ_FRAMEBUFFER, draw_framebuffer);
 980
 981     GLint read_buffer = 0;
 982     glGetIntegerv(GL_READ_BUFFER, &read_buffer);
 983     glReadBuffer(draw_buffer);
 984
 985     // TODO: reset imaging state too
 986     resetPixelPackState();
 987
 988     glReadPixels(0, 0, width, height, format, GL_UNSIGNED_BYTE, image->pixels);
 989
 990     restorePixelPackState();
 991     glReadBuffer(read_buffer);
 992     glBindFramebuffer(GL_READ_FRAMEBUFFER, read_framebuffer);
 993
 994     GLenum error = glGetError();
 995     if (error != GL_NO_ERROR) {
 996         do {
 997             std::cerr << "warning: " << enumToString(error) << " while getting snapshot\n";
 998             error = glGetError();
 999         } while(error != GL_NO_ERROR);
1000         delete image;
1001         return NULL;
1002     }
1003
1004     return image;
1005 }
1006
1007
1008 /**
1009  * Dump the image of the currently bound read buffer.
1010  */
1011 static inline void
1012 dumpReadBufferImage(JSONWriter &json, GLint width, GLint height, GLenum format)
1013 {
1014     GLint channels = __gl_format_channels(format);
1015
1016     json.beginObject();
1017
1018     // Tell the GUI this is no ordinary object, but an image
1019     json.writeStringMember("__class__", "image");
1020
1021     json.writeNumberMember("__width__", width);
1022     json.writeNumberMember("__height__", height);
1023     json.writeNumberMember("__depth__", 1);
1024
1025     // Hardcoded for now, but we could chose types more adequate to the
1026     // texture internal format
1027     json.writeStringMember("__type__", "uint8");
1028     json.writeBoolMember("__normalized__", true);
1029     json.writeNumberMember("__channels__", channels);
1030
1031     GLubyte *pixels = new GLubyte[width*height*channels];
1032
1033     // TODO: reset imaging state too
1034     resetPixelPackState();
1035
1036     glReadPixels(0, 0, width, height, format, GL_UNSIGNED_BYTE, pixels);
1037
1038     restorePixelPackState();
1039
1040     json.beginMember("__data__");
1041     char *pngBuffer;
1042     int pngBufferSize;
1043     image::writePixelsToBuffer(pixels, width, height, channels, true, &pngBuffer, &pngBufferSize);
1044     //std::cerr <<" Before = "<<(width * height * channels * sizeof *pixels)
1045     //          <<", after = "<<pngBufferSize << ", ratio = " << double(width * height * channels * sizeof *pixels)/pngBufferSize;
1046     json.writeBase64(pngBuffer, pngBufferSize);
1047     free(pngBuffer);
1048     json.endMember(); // __data__
1049
1050     delete [] pixels;
1051     json.endObject();
1052 }
1053
1054
1055 static inline GLuint
1056 downsampledFramebuffer(GLuint oldFbo, GLint drawbuffer,
1057                        GLint colorRb, GLint depthRb, GLint stencilRb,
1058                        GLuint *rbs, GLint *numRbs)
1059 {
1060     GLuint fbo;
1061     GLint format;
1062     GLint w, h;
1063
1064     *numRbs = 0;
1065
1066     glGenFramebuffers(1, &fbo);
1067     glBindFramebuffer(GL_FRAMEBUFFER, fbo);
1068
1069     glBindRenderbuffer(GL_RENDERBUFFER, colorRb);
1070     glGetRenderbufferParameteriv(GL_RENDERBUFFER,
1071                                  GL_RENDERBUFFER_WIDTH, &w);
1072     glGetRenderbufferParameteriv(GL_RENDERBUFFER,
1073                                  GL_RENDERBUFFER_HEIGHT, &h);
1074     glGetRenderbufferParameteriv(GL_RENDERBUFFER,
1075                                  GL_RENDERBUFFER_INTERNAL_FORMAT, &format);
1076
1077     glGenRenderbuffers(1, &rbs[*numRbs]);
1078     glBindRenderbuffer(GL_RENDERBUFFER, rbs[*numRbs]);
1079     glRenderbufferStorage(GL_RENDERBUFFER, format, w, h);
1080     glFramebufferRenderbuffer(GL_FRAMEBUFFER, drawbuffer,
1081                               GL_RENDERBUFFER, rbs[*numRbs]);
1082
1083     glBindFramebuffer(GL_READ_FRAMEBUFFER, oldFbo);
1084     glBindFramebuffer(GL_DRAW_FRAMEBUFFER, fbo);
1085     glDrawBuffer(drawbuffer);
1086     glReadBuffer(drawbuffer);
1087     glBlitFramebuffer(0, 0, w, h, 0, 0, w, h,
1088                       GL_COLOR_BUFFER_BIT, GL_NEAREST);
1089     glBindFramebuffer(GL_FRAMEBUFFER, fbo);
1090     ++*numRbs;
1091
1092     if (stencilRb == depthRb && stencilRb) {
1093         //combined depth and stencil buffer
1094         glBindRenderbuffer(GL_RENDERBUFFER, depthRb);
1095         glGetRenderbufferParameteriv(GL_RENDERBUFFER,
1096                                      GL_RENDERBUFFER_WIDTH, &w);
1097         glGetRenderbufferParameteriv(GL_RENDERBUFFER,
1098                                      GL_RENDERBUFFER_HEIGHT, &h);
1099         glGetRenderbufferParameteriv(GL_RENDERBUFFER,
1100                                      GL_RENDERBUFFER_INTERNAL_FORMAT, &format);
1101
1102         glGenRenderbuffers(1, &rbs[*numRbs]);
1103         glBindRenderbuffer(GL_RENDERBUFFER, rbs[*numRbs]);
1104         glRenderbufferStorage(GL_RENDERBUFFER, format, w, h);
1105         glFramebufferRenderbuffer(GL_FRAMEBUFFER, GL_DEPTH_STENCIL_ATTACHMENT,
1106                                   GL_RENDERBUFFER, rbs[*numRbs]);
1107         glBindFramebuffer(GL_READ_FRAMEBUFFER, oldFbo);
1108         glBindFramebuffer(GL_DRAW_FRAMEBUFFER, fbo);
1109         glBlitFramebuffer(0, 0, w, h, 0, 0, w, h,
1110                           GL_DEPTH_BUFFER_BIT | GL_STENCIL_BUFFER_BIT, GL_NEAREST);
1111         glBindFramebuffer(GL_FRAMEBUFFER, fbo);
1112         ++*numRbs;
1113     } else {
1114         if (depthRb) {
1115             glBindRenderbuffer(GL_RENDERBUFFER, depthRb);
1116             glGetRenderbufferParameteriv(GL_RENDERBUFFER,
1117                                          GL_RENDERBUFFER_WIDTH, &w);
1118             glGetRenderbufferParameteriv(GL_RENDERBUFFER,
1119                                          GL_RENDERBUFFER_HEIGHT, &h);
1120             glGetRenderbufferParameteriv(GL_RENDERBUFFER,
1121                                          GL_RENDERBUFFER_INTERNAL_FORMAT, &format);
1122
1123             glGenRenderbuffers(1, &rbs[*numRbs]);
1124             glBindRenderbuffer(GL_RENDERBUFFER, rbs[*numRbs]);
1125             glRenderbufferStorage(GL_RENDERBUFFER, format, w, h);
1126             glFramebufferRenderbuffer(GL_FRAMEBUFFER,
1127                                       GL_DEPTH_ATTACHMENT,
1128                                       GL_RENDERBUFFER, rbs[*numRbs]);
1129             glBindFramebuffer(GL_READ_FRAMEBUFFER, oldFbo);
1130             glBindFramebuffer(GL_DRAW_FRAMEBUFFER, fbo);
1131             glDrawBuffer(GL_DEPTH_ATTACHMENT);
1132             glReadBuffer(GL_DEPTH_ATTACHMENT);
1133             glBlitFramebuffer(0, 0, w, h, 0, 0, w, h,
1134                               GL_DEPTH_BUFFER_BIT, GL_NEAREST);
1135             ++*numRbs;
1136         }
1137         if (stencilRb) {
1138             glBindRenderbuffer(GL_RENDERBUFFER, stencilRb);
1139             glGetRenderbufferParameteriv(GL_RENDERBUFFER,
1140                                          GL_RENDERBUFFER_WIDTH, &w);
1141             glGetRenderbufferParameteriv(GL_RENDERBUFFER,
1142                                          GL_RENDERBUFFER_HEIGHT, &h);
1143             glGetRenderbufferParameteriv(GL_RENDERBUFFER,
1144                                      GL_RENDERBUFFER_INTERNAL_FORMAT, &format);
1145
1146             glGenRenderbuffers(1, &rbs[*numRbs]);
1147             glBindRenderbuffer(GL_RENDERBUFFER, rbs[*numRbs]);
1148             glRenderbufferStorage(GL_RENDERBUFFER, format, w, h);
1149             glFramebufferRenderbuffer(GL_FRAMEBUFFER,
1150                                       GL_STENCIL_ATTACHMENT,
1151                                       GL_RENDERBUFFER, rbs[*numRbs]);
1152             glBindFramebuffer(GL_READ_FRAMEBUFFER, oldFbo);
1153             glBindFramebuffer(GL_DRAW_FRAMEBUFFER, fbo);
1154             glDrawBuffer(GL_STENCIL_ATTACHMENT);
1155             glReadBuffer(GL_STENCIL_ATTACHMENT);
1156             glBlitFramebuffer(0, 0, w, h, 0, 0, w, h,
1157                               GL_STENCIL_BUFFER_BIT, GL_NEAREST);
1158             ++*numRbs;
1159         }
1160     }
1161
1162     return fbo;
1163 }
1164
1165
1166 /**
1167  * Dump images of current draw drawable/window.
1168  */
1169 static void
1170 dumpDrawableImages(JSONWriter &json)
1171 {
1172     GLint width, height;
1173
1174     if (!getDrawableBounds(&width, &height)) {
1175         return;
1176     }
1177
1178     GLint draw_buffer = GL_NONE;
1179     glGetIntegerv(GL_DRAW_BUFFER, &draw_buffer);
1180     glReadBuffer(draw_buffer);
1181
1182     if (draw_buffer != GL_NONE) {
1183         GLint read_buffer = GL_NONE;
1184         glGetIntegerv(GL_READ_BUFFER, &read_buffer);
1185
1186         GLint alpha_bits = 0;
1187         glGetIntegerv(GL_ALPHA_BITS, &alpha_bits);
1188         GLenum format = alpha_bits ? GL_RGBA : GL_RGB;
1189         json.beginMember(enumToString(draw_buffer));
1190         dumpReadBufferImage(json, width, height, format);
1191         json.endMember();
1192
1193         glReadBuffer(read_buffer);
1194     }
1195
1196     GLint depth_bits = 0;
1197     glGetIntegerv(GL_DEPTH_BITS, &depth_bits);
1198     if (depth_bits) {
1199         json.beginMember("GL_DEPTH_COMPONENT");
1200         dumpReadBufferImage(json, width, height, GL_DEPTH_COMPONENT);
1201         json.endMember();
1202     }
1203
1204     GLint stencil_bits = 0;
1205     glGetIntegerv(GL_STENCIL_BITS, &stencil_bits);
1206     if (stencil_bits) {
1207         json.beginMember("GL_STENCIL_INDEX");
1208         dumpReadBufferImage(json, width, height, GL_STENCIL_INDEX);
1209         json.endMember();
1210     }
1211 }
1212 /**
1213  * Dump the specified framebuffer attachment.
1214  *
1215  * In the case of a color attachment, it assumes it is already bound for read.
1216  */
1217 static void
1218 dumpFramebufferAttachment(JSONWriter &json, GLenum target, GLenum attachment, GLenum format)
1219 {
1220     GLint width = 0, height = 0;
1221     if (!getFramebufferAttachmentSize(target, attachment, &width, &height)) {
1222         return;
1223     }
1224
1225     GLint internalFormat = getFramebufferAttachmentFormat(target, attachment);
1226     std::stringstream ss;
1227     ss << enumToString(attachment);
1228     if (internalFormat != GL_NONE) {
1229         ss << ", ";
1230         ss << enumToString(internalFormat);
1231     }
1232
1233     json.beginMember(ss.str());
1234     dumpReadBufferImage(json, width, height, format);
1235     json.endMember();
1236 }
1237
1238
1239 static void
1240 dumpFramebufferAttachments(JSONWriter &json, GLenum target)
1241 {
1242     GLint read_framebuffer = 0;
1243     glGetIntegerv(GL_READ_FRAMEBUFFER_BINDING, &read_framebuffer);
1244
1245     GLint read_buffer = GL_NONE;
1246     glGetIntegerv(GL_READ_BUFFER, &read_buffer);
1247
1248     GLint max_draw_buffers = 1;
1249     glGetIntegerv(GL_MAX_DRAW_BUFFERS, &max_draw_buffers);
1250     GLint max_color_attachments = 0;
1251     glGetIntegerv(GL_MAX_COLOR_ATTACHMENTS, &max_color_attachments);
1252
1253     for (GLint i = 0; i < max_draw_buffers; ++i) {
1254         GLint draw_buffer = GL_NONE;
1255         glGetIntegerv(GL_DRAW_BUFFER0 + i, &draw_buffer);
1256         if (draw_buffer != GL_NONE) {
1257             glReadBuffer(draw_buffer);
1258             GLint attachment;
1259             if (draw_buffer >= GL_COLOR_ATTACHMENT0 && draw_buffer < GL_COLOR_ATTACHMENT0 + max_color_attachments) {
1260                 attachment = draw_buffer;
1261             } else {
1262                 std::cerr << "warning: unexpected GL_DRAW_BUFFER" << i << " = " << draw_buffer << "\n";
1263                 attachment = GL_COLOR_ATTACHMENT0;
1264             }
1265             GLint alpha_size = 0;
1266             glGetFramebufferAttachmentParameteriv(target, attachment,
1267                                                   GL_FRAMEBUFFER_ATTACHMENT_ALPHA_SIZE,
1268                                                   &alpha_size);
1269             GLenum format = alpha_size ? GL_RGBA : GL_RGB;
1270             dumpFramebufferAttachment(json, target, attachment, format);
1271         }
1272     }
1273
1274     glReadBuffer(read_buffer);
1275
1276     dumpFramebufferAttachment(json, target, GL_DEPTH_ATTACHMENT, GL_DEPTH_COMPONENT);
1277     dumpFramebufferAttachment(json, target, GL_STENCIL_ATTACHMENT, GL_STENCIL_INDEX);
1278
1279     glBindFramebuffer(GL_READ_FRAMEBUFFER, read_framebuffer);
1280 }
1281
1282
1283 static void
1284 dumpFramebuffer(JSONWriter &json)
1285 {
1286     json.beginMember("framebuffer");
1287     json.beginObject();
1288
1289     GLint boundDrawFbo = 0, boundReadFbo = 0;
1290     glGetIntegerv(GL_DRAW_FRAMEBUFFER_BINDING, &boundDrawFbo);
1291     glGetIntegerv(GL_READ_FRAMEBUFFER_BINDING, &boundReadFbo);
1292     if (!boundDrawFbo) {
1293         dumpDrawableImages(json);
1294     } else {
1295         GLint colorRb = 0, stencilRb = 0, depthRb = 0;
1296         GLint draw_buffer0 = GL_NONE;
1297         glGetIntegerv(GL_DRAW_BUFFER0, &draw_buffer0);
1298         bool multisample = false;
1299
1300         GLint boundRb = 0;
1301         glGetIntegerv(GL_RENDERBUFFER_BINDING, &boundRb);
1302
1303         GLint object_type;
1304         glGetFramebufferAttachmentParameteriv(GL_DRAW_FRAMEBUFFER, draw_buffer0, GL_FRAMEBUFFER_ATTACHMENT_OBJECT_TYPE, &object_type);
1305         if (object_type == GL_RENDERBUFFER) {
1306             glGetFramebufferAttachmentParameteriv(GL_DRAW_FRAMEBUFFER, draw_buffer0, GL_FRAMEBUFFER_ATTACHMENT_OBJECT_NAME, &colorRb);
1307             glBindRenderbuffer(GL_RENDERBUFFER, colorRb);
1308             GLint samples = 0;
1309             glGetRenderbufferParameteriv(GL_RENDERBUFFER, GL_RENDERBUFFER_SAMPLES, &samples);
1310             if (samples) {
1311                 multisample = true;
1312             }
1313         }
1314
1315         glGetFramebufferAttachmentParameteriv(GL_DRAW_FRAMEBUFFER, GL_DEPTH_ATTACHMENT, GL_FRAMEBUFFER_ATTACHMENT_OBJECT_TYPE, &object_type);
1316         if (object_type == GL_RENDERBUFFER) {
1317             glGetFramebufferAttachmentParameteriv(GL_DRAW_FRAMEBUFFER, GL_DEPTH_ATTACHMENT, GL_FRAMEBUFFER_ATTACHMENT_OBJECT_NAME, &depthRb);
1318             glBindRenderbuffer(GL_RENDERBUFFER, depthRb);
1319             GLint samples = 0;
1320             glGetRenderbufferParameteriv(GL_RENDERBUFFER, GL_RENDERBUFFER_SAMPLES, &samples);
1321             if (samples) {
1322                 multisample = true;
1323             }
1324         }
1325
1326         glGetFramebufferAttachmentParameteriv(GL_DRAW_FRAMEBUFFER, GL_STENCIL_ATTACHMENT, GL_FRAMEBUFFER_ATTACHMENT_OBJECT_TYPE, &object_type);
1327         if (object_type == GL_RENDERBUFFER) {
1328             glGetFramebufferAttachmentParameteriv(GL_DRAW_FRAMEBUFFER, GL_STENCIL_ATTACHMENT, GL_FRAMEBUFFER_ATTACHMENT_OBJECT_NAME, &stencilRb);
1329             glBindRenderbuffer(GL_RENDERBUFFER, stencilRb);
1330             GLint samples = 0;
1331             glGetRenderbufferParameteriv(GL_RENDERBUFFER, GL_RENDERBUFFER_SAMPLES, &samples);
1332             if (samples) {
1333                 multisample = true;
1334             }
1335         }
1336
1337         glBindRenderbuffer(GL_RENDERBUFFER, boundRb);
1338
1339         GLuint rbs[3];
1340         GLint numRbs = 0;
1341         GLuint fboCopy = 0;
1342
1343         if (multisample) {
1344             // glReadPixels doesnt support multisampled buffers so we need
1345             // to blit the fbo to a temporary one
1346             fboCopy = downsampledFramebuffer(boundDrawFbo, draw_buffer0,
1347                                              colorRb, depthRb, stencilRb,
1348                                              rbs, &numRbs);
1349         }
1350
1351         dumpFramebufferAttachments(json, GL_DRAW_FRAMEBUFFER);
1352
1353         if (multisample) {
1354             glBindRenderbuffer(GL_RENDERBUFFER_BINDING, boundRb);
1355             glDeleteRenderbuffers(numRbs, rbs);
1356             glDeleteFramebuffers(1, &fboCopy);
1357         }
1358
1359         glBindFramebuffer(GL_READ_FRAMEBUFFER, boundReadFbo);
1360         glBindFramebuffer(GL_DRAW_FRAMEBUFFER, boundDrawFbo);
1361     }
1362
1363     json.endObject();
1364     json.endMember(); // framebuffer
1365 }
1366
1367
1368 static const GLenum bindings[] = {
1369     GL_DRAW_BUFFER,
1370     GL_READ_BUFFER,
1371     GL_PIXEL_PACK_BUFFER_BINDING,
1372     GL_PIXEL_UNPACK_BUFFER_BINDING,
1373     GL_TEXTURE_BINDING_1D,
1374     GL_TEXTURE_BINDING_2D,
1375     GL_TEXTURE_BINDING_3D,
1376     GL_TEXTURE_BINDING_RECTANGLE,
1377     GL_TEXTURE_BINDING_CUBE_MAP,
1378     GL_DRAW_FRAMEBUFFER_BINDING,
1379     GL_READ_FRAMEBUFFER_BINDING,
1380     GL_RENDERBUFFER_BINDING,
1381     GL_DRAW_BUFFER0,
1382     GL_DRAW_BUFFER1,
1383     GL_DRAW_BUFFER2,
1384     GL_DRAW_BUFFER3,
1385     GL_DRAW_BUFFER4,
1386     GL_DRAW_BUFFER5,
1387     GL_DRAW_BUFFER6,
1388     GL_DRAW_BUFFER7,
1389 };
1390
1391
1392 #define NUM_BINDINGS sizeof(bindings)/sizeof(bindings[0])
1393
1394
1395 void dumpCurrentContext(std::ostream &os)
1396 {
1397     JSONWriter json(os);
1398
1399 #ifndef NDEBUG
1400     GLint old_bindings[NUM_BINDINGS];
1401     for (unsigned i = 0; i < NUM_BINDINGS; ++i) {
1402         old_bindings[i] = 0;
1403         glGetIntegerv(bindings[i], &old_bindings[i]);
1404     }
1405 #endif
1406
1407     dumpParameters(json);
1408     dumpShadersUniforms(json);
1409     dumpTextures(json);
1410     dumpFramebuffer(json);
1411
1412 #ifndef NDEBUG
1413     for (unsigned i = 0; i < NUM_BINDINGS; ++i) {
1414         GLint new_binding = 0;
1415         glGetIntegerv(bindings[i], &new_binding);
1416         if (new_binding != old_bindings[i]) {
1417             std::cerr << "warning: " << enumToString(bindings[i]) << " was clobbered\n";
1418         }
1419     }
1420 #endif
1421
1422 }
1423
1424
1425 } /* namespace glstate */