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
 572     width = 0;
 573     glGetTexLevelParameteriv(target, level, GL_TEXTURE_WIDTH, &width);
 574
 575     if (target != GL_TEXTURE_1D) {
 576         height = 0;
 577         glGetTexLevelParameteriv(target, level, GL_TEXTURE_HEIGHT, &height);
 578         if (target == GL_TEXTURE_3D) {
 579             depth = 0;
 580             glGetTexLevelParameteriv(target, level, GL_TEXTURE_DEPTH, &depth);
 581         }
 582     }
 583
 584     if (width <= 0 || height <= 0 || depth <= 0) {
 585         return;
 586     } else {
 587         char label[512];
 588
 589         GLint active_texture = GL_TEXTURE0;
 590         glGetIntegerv(GL_ACTIVE_TEXTURE, &active_texture);
 591         snprintf(label, sizeof label, "%s, %s, level = %i", enumToString(active_texture), enumToString(target), level);
 592
 593         json.beginMember(label);
 594
 595         json.beginObject();
 596
 597         // Tell the GUI this is no ordinary object, but an image
 598         json.writeStringMember("__class__", "image");
 599
 600         json.writeNumberMember("__width__", width);
 601         json.writeNumberMember("__height__", height);
 602         json.writeNumberMember("__depth__", depth);
 603
 604         // Hardcoded for now, but we could chose types more adequate to the
 605         // texture internal format
 606         json.writeStringMember("__type__", "uint8");
 607         json.writeBoolMember("__normalized__", true);
 608         json.writeNumberMember("__channels__", 4);
 609
 610         GLubyte *pixels = new GLubyte[depth*width*height*4];
 611
 612         resetPixelPackState();
 613
 614         glGetTexImage(target, level, GL_RGBA, GL_UNSIGNED_BYTE, pixels);
 615
 616         restorePixelPackState();
 617
 618         json.beginMember("__data__");
 619         char *pngBuffer;
 620         int pngBufferSize;
 621         image::writePixelsToBuffer(pixels, width, height, 4, true, &pngBuffer, &pngBufferSize);
 622         json.writeBase64(pngBuffer, pngBufferSize);
 623         free(pngBuffer);
 624         json.endMember(); // __data__
 625
 626         delete [] pixels;
 627         json.endObject();
 628     }
 629 }
 630
 631
 632 static inline void
 633 dumpTexture(JSONWriter &json, GLenum target, GLenum binding)
 634 {
 635     GLint texture_binding = 0;
 636     glGetIntegerv(binding, &texture_binding);
 637     if (!glIsEnabled(target) && !texture_binding) {
 638         return;
 639     }
 640
 641     GLint level = 0;
 642     do {
 643         GLint width = 0, height = 0;
 644         glGetTexLevelParameteriv(target, level, GL_TEXTURE_WIDTH, &width);
 645         glGetTexLevelParameteriv(target, level, GL_TEXTURE_HEIGHT, &height);
 646         if (!width || !height) {
 647             break;
 648         }
 649
 650         if (target == GL_TEXTURE_CUBE_MAP) {
 651             for (int face = 0; face < 6; ++face) {
 652                 dumpTextureImage(json, GL_TEXTURE_CUBE_MAP_POSITIVE_X + face, level);
 653             }
 654         } else {
 655             dumpTextureImage(json, target, level);
 656         }
 657
 658         ++level;
 659     } while(true);
 660 }
 661
 662
 663 static inline void
 664 dumpTextures(JSONWriter &json)
 665 {
 666     json.beginMember("textures");
 667     json.beginObject();
 668     GLint active_texture = GL_TEXTURE0;
 669     glGetIntegerv(GL_ACTIVE_TEXTURE, &active_texture);
 670     GLint max_texture_coords = 0;
 671     glGetIntegerv(GL_MAX_TEXTURE_COORDS, &max_texture_coords);
 672     GLint max_combined_texture_image_units = 0;
 673     glGetIntegerv(GL_MAX_COMBINED_TEXTURE_IMAGE_UNITS, &max_combined_texture_image_units);
 674     GLint max_units = std::max(max_combined_texture_image_units, max_texture_coords);
 675     for (GLint unit = 0; unit < max_units; ++unit) {
 676         GLenum texture = GL_TEXTURE0 + unit;
 677         glActiveTexture(texture);
 678         dumpTexture(json, GL_TEXTURE_1D, GL_TEXTURE_BINDING_1D);
 679         dumpTexture(json, GL_TEXTURE_2D, GL_TEXTURE_BINDING_2D);
 680         dumpTexture(json, GL_TEXTURE_3D, GL_TEXTURE_BINDING_3D);
 681         dumpTexture(json, GL_TEXTURE_RECTANGLE, GL_TEXTURE_BINDING_RECTANGLE);
 682         dumpTexture(json, GL_TEXTURE_CUBE_MAP, GL_TEXTURE_BINDING_CUBE_MAP);
 683     }
 684     glActiveTexture(active_texture);
 685     json.endObject();
 686     json.endMember(); // textures
 687 }
 688
 689
 690 static bool
 691 getDrawableBounds(GLint *width, GLint *height) {
 692 #if defined(_WIN32)
 693
 694     HDC hDC = wglGetCurrentDC();
 695     if (!hDC) {
 696         return false;
 697     }
 698
 699     HWND hWnd = WindowFromDC(hDC);
 700     RECT rect;
 701
 702     if (!GetClientRect(hWnd, &rect)) {
 703        return false;
 704     }
 705
 706     *width  = rect.right  - rect.left;
 707     *height = rect.bottom - rect.top;
 708
 709 #elif defined(__APPLE__)
 710
 711     CGLContextObj ctx = CGLGetCurrentContext();
 712     if (ctx == NULL) {
 713         return false;
 714     }
 715
 716     CGSConnectionID cid;
 717     CGSWindowID wid;
 718     CGSSurfaceID sid;
 719
 720     if (CGLGetSurface(ctx, &cid, &wid, &sid) != kCGLNoError) {
 721         return false;
 722     }
 723
 724     CGRect rect;
 725
 726     if (CGSGetSurfaceBounds(cid, wid, sid, &rect) != 0) {
 727         return false;
 728     }
 729
 730     *width = rect.size.width;
 731     *height = rect.size.height;
 732
 733 #else
 734
 735     Display *display;
 736     Drawable drawable;
 737     Window root;
 738     int x, y;
 739     unsigned int w, h, bw, depth;
 740
 741     display = glXGetCurrentDisplay();
 742     if (!display) {
 743         return false;
 744     }
 745
 746     drawable = glXGetCurrentDrawable();
 747     if (drawable == None) {
 748         return false;
 749     }
 750
 751     if (!XGetGeometry(display, drawable, &root, &x, &y, &w, &h, &bw, &depth)) {
 752         return false;
 753     }
 754
 755     *width = w;
 756     *height = h;
 757
 758 #endif
 759
 760     return true;
 761 }
 762
 763
 764 static const GLenum texture_bindings[][2] = {
 765     {GL_TEXTURE_1D, GL_TEXTURE_BINDING_1D},
 766     {GL_TEXTURE_2D, GL_TEXTURE_BINDING_2D},
 767     {GL_TEXTURE_3D, GL_TEXTURE_BINDING_3D},
 768     {GL_TEXTURE_RECTANGLE, GL_TEXTURE_BINDING_RECTANGLE},
 769     {GL_TEXTURE_CUBE_MAP, GL_TEXTURE_BINDING_CUBE_MAP}
 770 };
 771
 772
 773 static bool
 774 bindTexture(GLint texture, GLenum &target, GLint &bound_texture)
 775 {
 776
 777     for (unsigned i = 0; i < sizeof(texture_bindings)/sizeof(texture_bindings[0]); ++i) {
 778         target  = texture_bindings[i][0];
 779
 780         GLenum binding = texture_bindings[i][1];
 781
 782         while (glGetError() != GL_NO_ERROR)
 783             ;
 784
 785         glGetIntegerv(binding, &bound_texture);
 786         glBindTexture(target, texture);
 787
 788         if (glGetError() == GL_NO_ERROR) {
 789             return true;
 790         }
 791
 792         glBindTexture(target, bound_texture);
 793     }
 794
 795     target = GL_NONE;
 796
 797     return false;
 798 }
 799
 800
 801 static bool
 802 getTextureLevelSize(GLint texture, GLint level, GLint *width, GLint *height)
 803 {
 804     *width = 0;
 805     *height = 0;
 806
 807     GLenum target;
 808     GLint bound_texture = 0;
 809     if (!bindTexture(texture, target, bound_texture)) {
 810         return false;
 811     }
 812
 813     glGetTexLevelParameteriv(target, level, GL_TEXTURE_WIDTH, width);
 814     glGetTexLevelParameteriv(target, level, GL_TEXTURE_HEIGHT, height);
 815
 816     glBindTexture(target, bound_texture);
 817
 818     return *width > 0 && *height > 0;
 819 }
 820
 821
 822 static bool
 823 getRenderbufferSize(GLint renderbuffer, GLint *width, GLint *height)
 824 {
 825     GLint bound_renderbuffer = 0;
 826     glGetIntegerv(GL_RENDERBUFFER_BINDING, &bound_renderbuffer);
 827     glBindRenderbuffer(GL_RENDERBUFFER, renderbuffer);
 828
 829     *width = 0;
 830     *height = 0;
 831     glGetRenderbufferParameteriv(GL_RENDERBUFFER, GL_RENDERBUFFER_WIDTH, width);
 832     glGetRenderbufferParameteriv(GL_RENDERBUFFER, GL_RENDERBUFFER_HEIGHT, height);
 833
 834     glBindRenderbuffer(GL_RENDERBUFFER, bound_renderbuffer);
 835
 836     return *width > 0 && *height > 0;
 837 }
 838
 839
 840 static bool
 841 getFramebufferAttachmentSize(GLenum target, GLenum attachment, GLint *width, GLint *height)
 842 {
 843     GLint object_type = GL_NONE;
 844     glGetFramebufferAttachmentParameteriv(target, attachment,
 845                                           GL_FRAMEBUFFER_ATTACHMENT_OBJECT_TYPE,
 846                                           &object_type);
 847     if (object_type == GL_NONE) {
 848         return false;
 849     }
 850
 851     GLint object_name = 0;
 852     glGetFramebufferAttachmentParameteriv(target, attachment,
 853                                           GL_FRAMEBUFFER_ATTACHMENT_OBJECT_NAME,
 854                                           &object_name);
 855     if (object_name == 0) {
 856         return false;
 857     }
 858
 859     if (object_type == GL_RENDERBUFFER) {
 860         return getRenderbufferSize(object_name, width, height);
 861     } else if (object_type == GL_TEXTURE) {
 862         GLint texture_level = 0;
 863         glGetFramebufferAttachmentParameteriv(target, attachment,
 864                                               GL_FRAMEBUFFER_ATTACHMENT_TEXTURE_LEVEL,
 865                                               &texture_level);
 866         return getTextureLevelSize(object_name, texture_level, width, height);
 867     } else {
 868         std::cerr << "warning: unexpected GL_FRAMEBUFFER_ATTACHMENT_OBJECT_TYPE = " << object_type << "\n";
 869         return false;
 870     }
 871 }
 872
 873
 874 image::Image *
 875 getDrawBufferImage(GLenum format) {
 876     GLint channels = __gl_format_channels(format);
 877     if (channels > 4) {
 878         return NULL;
 879     }
 880
 881     GLint draw_framebuffer = 0;
 882     glGetIntegerv(GL_DRAW_FRAMEBUFFER_BINDING, &draw_framebuffer);
 883
 884     GLint draw_buffer = GL_NONE;
 885     GLint width, height;
 886     if (draw_framebuffer) {
 887         glGetIntegerv(GL_DRAW_BUFFER0, &draw_buffer);
 888         if (draw_buffer == GL_NONE) {
 889             return NULL;
 890         }
 891
 892         if (!getFramebufferAttachmentSize(GL_DRAW_FRAMEBUFFER, draw_buffer, &width, &height)) {
 893             return NULL;
 894         }
 895     } else {
 896         glGetIntegerv(GL_DRAW_BUFFER, &draw_buffer);
 897         if (draw_buffer == GL_NONE) {
 898             return NULL;
 899         }
 900
 901         if (!getDrawableBounds(&width, &height)) {
 902             return NULL;
 903         }
 904     }
 905
 906     image::Image *image = new image::Image(width, height, channels, true);
 907     if (!image) {
 908         return NULL;
 909     }
 910
 911     while (glGetError() != GL_NO_ERROR) {}
 912
 913     GLint read_framebuffer = 0;
 914     glGetIntegerv(GL_READ_FRAMEBUFFER_BINDING, &read_framebuffer);
 915     glBindFramebuffer(GL_READ_FRAMEBUFFER, draw_framebuffer);
 916
 917     GLint read_buffer = 0;
 918     glGetIntegerv(GL_READ_BUFFER, &read_buffer);
 919     glReadBuffer(draw_buffer);
 920
 921     // TODO: reset imaging state too
 922     resetPixelPackState();
 923
 924     glReadPixels(0, 0, width, height, format, GL_UNSIGNED_BYTE, image->pixels);
 925
 926     restorePixelPackState();
 927     glReadBuffer(read_buffer);
 928     glBindFramebuffer(GL_READ_FRAMEBUFFER, read_framebuffer);
 929
 930     GLenum error = glGetError();
 931     if (error != GL_NO_ERROR) {
 932         do {
 933             std::cerr << "warning: " << enumToString(error) << " while getting snapshot\n";
 934             error = glGetError();
 935         } while(error != GL_NO_ERROR);
 936         delete image;
 937         return NULL;
 938     }
 939
 940     return image;
 941 }
 942
 943
 944 /**
 945  * Dump the image of the currently bound read buffer.
 946  */
 947 static inline void
 948 dumpReadBufferImage(JSONWriter &json, GLint width, GLint height, GLenum format)
 949 {
 950     GLint channels = __gl_format_channels(format);
 951
 952     json.beginObject();
 953
 954     // Tell the GUI this is no ordinary object, but an image
 955     json.writeStringMember("__class__", "image");
 956
 957     json.writeNumberMember("__width__", width);
 958     json.writeNumberMember("__height__", height);
 959     json.writeNumberMember("__depth__", 1);
 960
 961     // Hardcoded for now, but we could chose types more adequate to the
 962     // texture internal format
 963     json.writeStringMember("__type__", "uint8");
 964     json.writeBoolMember("__normalized__", true);
 965     json.writeNumberMember("__channels__", channels);
 966
 967     GLubyte *pixels = new GLubyte[width*height*channels];
 968
 969     // TODO: reset imaging state too
 970     resetPixelPackState();
 971
 972     glReadPixels(0, 0, width, height, format, GL_UNSIGNED_BYTE, pixels);
 973
 974     restorePixelPackState();
 975
 976     json.beginMember("__data__");
 977     char *pngBuffer;
 978     int pngBufferSize;
 979     image::writePixelsToBuffer(pixels, width, height, channels, true, &pngBuffer, &pngBufferSize);
 980     //std::cerr <<" Before = "<<(width * height * channels * sizeof *pixels)
 981     //          <<", after = "<<pngBufferSize << ", ratio = " << double(width * height * channels * sizeof *pixels)/pngBufferSize;
 982     json.writeBase64(pngBuffer, pngBufferSize);
 983     free(pngBuffer);
 984     json.endMember(); // __data__
 985
 986     delete [] pixels;
 987     json.endObject();
 988 }
 989
 990
 991 static inline GLuint
 992 downsampledFramebuffer(GLuint oldFbo, GLint drawbuffer,
 993                        GLint colorRb, GLint depthRb, GLint stencilRb,
 994                        GLuint *rbs, GLint *numRbs)
 995 {
 996     GLuint fbo;
 997     GLint format;
 998     GLint w, h;
 999
1000     *numRbs = 0;
1001
1002     glGenFramebuffers(1, &fbo);
1003     glBindFramebuffer(GL_FRAMEBUFFER, fbo);
1004
1005     glBindRenderbuffer(GL_RENDERBUFFER, colorRb);
1006     glGetRenderbufferParameteriv(GL_RENDERBUFFER,
1007                                  GL_RENDERBUFFER_WIDTH, &w);
1008     glGetRenderbufferParameteriv(GL_RENDERBUFFER,
1009                                  GL_RENDERBUFFER_HEIGHT, &h);
1010     glGetRenderbufferParameteriv(GL_RENDERBUFFER,
1011                                  GL_RENDERBUFFER_INTERNAL_FORMAT, &format);
1012
1013     glGenRenderbuffers(1, &rbs[*numRbs]);
1014     glBindRenderbuffer(GL_RENDERBUFFER, rbs[*numRbs]);
1015     glRenderbufferStorage(GL_RENDERBUFFER, format, w, h);
1016     glFramebufferRenderbuffer(GL_FRAMEBUFFER, drawbuffer,
1017                               GL_RENDERBUFFER, rbs[*numRbs]);
1018
1019     glBindFramebuffer(GL_READ_FRAMEBUFFER, oldFbo);
1020     glBindFramebuffer(GL_DRAW_FRAMEBUFFER, fbo);
1021     glDrawBuffer(drawbuffer);
1022     glReadBuffer(drawbuffer);
1023     glBlitFramebuffer(0, 0, w, h, 0, 0, w, h,
1024                       GL_COLOR_BUFFER_BIT, GL_NEAREST);
1025     glBindFramebuffer(GL_FRAMEBUFFER, fbo);
1026     ++*numRbs;
1027
1028     if (stencilRb == depthRb && stencilRb) {
1029         //combined depth and stencil buffer
1030         glBindRenderbuffer(GL_RENDERBUFFER, depthRb);
1031         glGetRenderbufferParameteriv(GL_RENDERBUFFER,
1032                                      GL_RENDERBUFFER_WIDTH, &w);
1033         glGetRenderbufferParameteriv(GL_RENDERBUFFER,
1034                                      GL_RENDERBUFFER_HEIGHT, &h);
1035         glGetRenderbufferParameteriv(GL_RENDERBUFFER,
1036                                      GL_RENDERBUFFER_INTERNAL_FORMAT, &format);
1037
1038         glGenRenderbuffers(1, &rbs[*numRbs]);
1039         glBindRenderbuffer(GL_RENDERBUFFER, rbs[*numRbs]);
1040         glRenderbufferStorage(GL_RENDERBUFFER, format, w, h);
1041         glFramebufferRenderbuffer(GL_FRAMEBUFFER, GL_DEPTH_STENCIL_ATTACHMENT,
1042                                   GL_RENDERBUFFER, rbs[*numRbs]);
1043         glBindFramebuffer(GL_READ_FRAMEBUFFER, oldFbo);
1044         glBindFramebuffer(GL_DRAW_FRAMEBUFFER, fbo);
1045         glBlitFramebuffer(0, 0, w, h, 0, 0, w, h,
1046                           GL_DEPTH_BUFFER_BIT | GL_STENCIL_BUFFER_BIT, GL_NEAREST);
1047         glBindFramebuffer(GL_FRAMEBUFFER, fbo);
1048         ++*numRbs;
1049     } else {
1050         if (depthRb) {
1051             glBindRenderbuffer(GL_RENDERBUFFER, depthRb);
1052             glGetRenderbufferParameteriv(GL_RENDERBUFFER,
1053                                          GL_RENDERBUFFER_WIDTH, &w);
1054             glGetRenderbufferParameteriv(GL_RENDERBUFFER,
1055                                          GL_RENDERBUFFER_HEIGHT, &h);
1056             glGetRenderbufferParameteriv(GL_RENDERBUFFER,
1057                                          GL_RENDERBUFFER_INTERNAL_FORMAT, &format);
1058
1059             glGenRenderbuffers(1, &rbs[*numRbs]);
1060             glBindRenderbuffer(GL_RENDERBUFFER, rbs[*numRbs]);
1061             glRenderbufferStorage(GL_RENDERBUFFER, format, w, h);
1062             glFramebufferRenderbuffer(GL_FRAMEBUFFER,
1063                                       GL_DEPTH_ATTACHMENT,
1064                                       GL_RENDERBUFFER, rbs[*numRbs]);
1065             glBindFramebuffer(GL_READ_FRAMEBUFFER, oldFbo);
1066             glBindFramebuffer(GL_DRAW_FRAMEBUFFER, fbo);
1067             glDrawBuffer(GL_DEPTH_ATTACHMENT);
1068             glReadBuffer(GL_DEPTH_ATTACHMENT);
1069             glBlitFramebuffer(0, 0, w, h, 0, 0, w, h,
1070                               GL_DEPTH_BUFFER_BIT, GL_NEAREST);
1071             ++*numRbs;
1072         }
1073         if (stencilRb) {
1074             glBindRenderbuffer(GL_RENDERBUFFER, stencilRb);
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,
1086                                       GL_STENCIL_ATTACHMENT,
1087                                       GL_RENDERBUFFER, rbs[*numRbs]);
1088             glBindFramebuffer(GL_READ_FRAMEBUFFER, oldFbo);
1089             glBindFramebuffer(GL_DRAW_FRAMEBUFFER, fbo);
1090             glDrawBuffer(GL_STENCIL_ATTACHMENT);
1091             glReadBuffer(GL_STENCIL_ATTACHMENT);
1092             glBlitFramebuffer(0, 0, w, h, 0, 0, w, h,
1093                               GL_STENCIL_BUFFER_BIT, GL_NEAREST);
1094             ++*numRbs;
1095         }
1096     }
1097
1098     return fbo;
1099 }
1100
1101
1102 /**
1103  * Dump images of current draw drawable/window.
1104  */
1105 static void
1106 dumpDrawableImages(JSONWriter &json)
1107 {
1108     GLint width, height;
1109
1110     if (!getDrawableBounds(&width, &height)) {
1111         return;
1112     }
1113
1114     GLint draw_buffer = GL_NONE;
1115     glGetIntegerv(GL_DRAW_BUFFER, &draw_buffer);
1116     glReadBuffer(draw_buffer);
1117
1118     if (draw_buffer != GL_NONE) {
1119         GLint read_buffer = GL_NONE;
1120         glGetIntegerv(GL_READ_BUFFER, &read_buffer);
1121
1122         GLint alpha_bits = 0;
1123         glGetIntegerv(GL_ALPHA_BITS, &alpha_bits);
1124         GLenum format = alpha_bits ? GL_RGBA : GL_RGB;
1125         json.beginMember(enumToString(draw_buffer));
1126         dumpReadBufferImage(json, width, height, format);
1127         json.endMember();
1128
1129         glReadBuffer(read_buffer);
1130     }
1131
1132     GLint depth_bits = 0;
1133     glGetIntegerv(GL_DEPTH_BITS, &depth_bits);
1134     if (depth_bits) {
1135         json.beginMember("GL_DEPTH_COMPONENT");
1136         dumpReadBufferImage(json, width, height, GL_DEPTH_COMPONENT);
1137         json.endMember();
1138     }
1139
1140     GLint stencil_bits = 0;
1141     glGetIntegerv(GL_STENCIL_BITS, &stencil_bits);
1142     if (stencil_bits) {
1143         json.beginMember("GL_STENCIL_INDEX");
1144         dumpReadBufferImage(json, width, height, GL_STENCIL_INDEX);
1145         json.endMember();
1146     }
1147 }
1148 /**
1149  * Dump the specified framebuffer attachment.
1150  *
1151  * In the case of a color attachment, it assumes it is already bound for read.
1152  */
1153 static void
1154 dumpFramebufferAttachment(JSONWriter &json, GLenum target, GLenum attachment, GLenum format)
1155 {
1156     GLint width = 0, height = 0;
1157     if (!getFramebufferAttachmentSize(target, attachment, &width, &height)) {
1158         return;
1159     }
1160
1161     json.beginMember(enumToString(attachment));
1162     dumpReadBufferImage(json, width, height, format);
1163     json.endMember();
1164 }
1165
1166
1167 static void
1168 dumpFramebufferAttachments(JSONWriter &json, GLenum target)
1169 {
1170     GLint read_framebuffer = 0;
1171     glGetIntegerv(GL_READ_FRAMEBUFFER_BINDING, &read_framebuffer);
1172
1173     GLint read_buffer = GL_NONE;
1174     glGetIntegerv(GL_READ_BUFFER, &read_buffer);
1175
1176     GLint max_draw_buffers = 1;
1177     glGetIntegerv(GL_MAX_DRAW_BUFFERS, &max_draw_buffers);
1178     GLint max_color_attachments = 0;
1179     glGetIntegerv(GL_MAX_COLOR_ATTACHMENTS, &max_color_attachments);
1180
1181     for (GLint i = 0; i < max_draw_buffers; ++i) {
1182         GLint draw_buffer = GL_NONE;
1183         glGetIntegerv(GL_DRAW_BUFFER0 + i, &draw_buffer);
1184         if (draw_buffer != GL_NONE) {
1185             glReadBuffer(draw_buffer);
1186             GLint attachment;
1187             if (draw_buffer >= GL_COLOR_ATTACHMENT0 && draw_buffer < GL_COLOR_ATTACHMENT0 + max_color_attachments) {
1188                 attachment = draw_buffer;
1189             } else {
1190                 std::cerr << "warning: unexpected GL_DRAW_BUFFER" << i << " = " << draw_buffer << "\n";
1191                 attachment = GL_COLOR_ATTACHMENT0;
1192             }
1193             GLint alpha_size = 0;
1194             glGetFramebufferAttachmentParameteriv(target, attachment,
1195                                                   GL_FRAMEBUFFER_ATTACHMENT_ALPHA_SIZE,
1196                                                   &alpha_size);
1197             GLenum format = alpha_size ? GL_RGBA : GL_RGB;
1198             dumpFramebufferAttachment(json, target, attachment, format);
1199         }
1200     }
1201
1202     glReadBuffer(read_buffer);
1203
1204     dumpFramebufferAttachment(json, target, GL_DEPTH_ATTACHMENT, GL_DEPTH_COMPONENT);
1205     dumpFramebufferAttachment(json, target, GL_STENCIL_ATTACHMENT, GL_STENCIL_INDEX);
1206
1207     glBindFramebuffer(GL_READ_FRAMEBUFFER, read_framebuffer);
1208 }
1209
1210
1211 static void
1212 dumpFramebuffer(JSONWriter &json)
1213 {
1214     json.beginMember("framebuffer");
1215     json.beginObject();
1216
1217     GLint boundDrawFbo = 0, boundReadFbo = 0;
1218     glGetIntegerv(GL_DRAW_FRAMEBUFFER_BINDING, &boundDrawFbo);
1219     glGetIntegerv(GL_READ_FRAMEBUFFER_BINDING, &boundReadFbo);
1220     if (!boundDrawFbo) {
1221         dumpDrawableImages(json);
1222     } else {
1223         GLint colorRb = 0, stencilRb = 0, depthRb = 0;
1224         GLint draw_buffer0 = GL_NONE;
1225         glGetIntegerv(GL_DRAW_BUFFER0, &draw_buffer0);
1226         bool multisample = false;
1227
1228         GLint boundRb = 0;
1229         glGetIntegerv(GL_RENDERBUFFER_BINDING, &boundRb);
1230
1231         GLint object_type;
1232         glGetFramebufferAttachmentParameteriv(GL_DRAW_FRAMEBUFFER, draw_buffer0, GL_FRAMEBUFFER_ATTACHMENT_OBJECT_TYPE, &object_type);
1233         if (object_type == GL_RENDERBUFFER) {
1234             glGetFramebufferAttachmentParameteriv(GL_DRAW_FRAMEBUFFER, draw_buffer0, GL_FRAMEBUFFER_ATTACHMENT_OBJECT_NAME, &colorRb);
1235             glBindRenderbuffer(GL_RENDERBUFFER, colorRb);
1236             GLint samples = 0;
1237             glGetRenderbufferParameteriv(GL_RENDERBUFFER, GL_RENDERBUFFER_SAMPLES, &samples);
1238             if (samples) {
1239                 multisample = true;
1240             }
1241         }
1242
1243         glGetFramebufferAttachmentParameteriv(GL_DRAW_FRAMEBUFFER, GL_DEPTH_ATTACHMENT, GL_FRAMEBUFFER_ATTACHMENT_OBJECT_TYPE, &object_type);
1244         if (object_type == GL_RENDERBUFFER) {
1245             glGetFramebufferAttachmentParameteriv(GL_DRAW_FRAMEBUFFER, GL_DEPTH_ATTACHMENT, GL_FRAMEBUFFER_ATTACHMENT_OBJECT_NAME, &depthRb);
1246             glBindRenderbuffer(GL_RENDERBUFFER, depthRb);
1247             GLint samples = 0;
1248             glGetRenderbufferParameteriv(GL_RENDERBUFFER, GL_RENDERBUFFER_SAMPLES, &samples);
1249             if (samples) {
1250                 multisample = true;
1251             }
1252         }
1253
1254         glGetFramebufferAttachmentParameteriv(GL_DRAW_FRAMEBUFFER, GL_STENCIL_ATTACHMENT, GL_FRAMEBUFFER_ATTACHMENT_OBJECT_TYPE, &object_type);
1255         if (object_type == GL_RENDERBUFFER) {
1256             glGetFramebufferAttachmentParameteriv(GL_DRAW_FRAMEBUFFER, GL_STENCIL_ATTACHMENT, GL_FRAMEBUFFER_ATTACHMENT_OBJECT_NAME, &stencilRb);
1257             glBindRenderbuffer(GL_RENDERBUFFER, stencilRb);
1258             GLint samples = 0;
1259             glGetRenderbufferParameteriv(GL_RENDERBUFFER, GL_RENDERBUFFER_SAMPLES, &samples);
1260             if (samples) {
1261                 multisample = true;
1262             }
1263         }
1264
1265         glBindRenderbuffer(GL_RENDERBUFFER, boundRb);
1266
1267         GLuint rbs[3];
1268         GLint numRbs = 0;
1269         GLuint fboCopy = 0;
1270
1271         if (multisample) {
1272             // glReadPixels doesnt support multisampled buffers so we need
1273             // to blit the fbo to a temporary one
1274             fboCopy = downsampledFramebuffer(boundDrawFbo, draw_buffer0,
1275                                              colorRb, depthRb, stencilRb,
1276                                              rbs, &numRbs);
1277         }
1278
1279         dumpFramebufferAttachments(json, GL_DRAW_FRAMEBUFFER);
1280
1281         if (multisample) {
1282             glBindRenderbuffer(GL_RENDERBUFFER_BINDING, boundRb);
1283             glDeleteRenderbuffers(numRbs, rbs);
1284             glDeleteFramebuffers(1, &fboCopy);
1285         }
1286
1287         glBindFramebuffer(GL_READ_FRAMEBUFFER, boundReadFbo);
1288         glBindFramebuffer(GL_DRAW_FRAMEBUFFER, boundDrawFbo);
1289     }
1290
1291     json.endObject();
1292     json.endMember(); // framebuffer
1293 }
1294
1295
1296 static const GLenum bindings[] = {
1297     GL_DRAW_BUFFER,
1298     GL_READ_BUFFER,
1299     GL_PIXEL_PACK_BUFFER_BINDING,
1300     GL_PIXEL_UNPACK_BUFFER_BINDING,
1301     GL_TEXTURE_BINDING_1D,
1302     GL_TEXTURE_BINDING_2D,
1303     GL_TEXTURE_BINDING_3D,
1304     GL_TEXTURE_BINDING_RECTANGLE,
1305     GL_TEXTURE_BINDING_CUBE_MAP,
1306     GL_DRAW_FRAMEBUFFER_BINDING,
1307     GL_READ_FRAMEBUFFER_BINDING,
1308     GL_RENDERBUFFER_BINDING,
1309     GL_DRAW_BUFFER0,
1310     GL_DRAW_BUFFER1,
1311     GL_DRAW_BUFFER2,
1312     GL_DRAW_BUFFER3,
1313     GL_DRAW_BUFFER4,
1314     GL_DRAW_BUFFER5,
1315     GL_DRAW_BUFFER6,
1316     GL_DRAW_BUFFER7,
1317 };
1318
1319
1320 #define NUM_BINDINGS sizeof(bindings)/sizeof(bindings[0])
1321
1322
1323 void dumpCurrentContext(std::ostream &os)
1324 {
1325     JSONWriter json(os);
1326
1327 #ifndef NDEBUG
1328     GLint old_bindings[NUM_BINDINGS];
1329     for (unsigned i = 0; i < NUM_BINDINGS; ++i) {
1330         old_bindings[i] = 0;
1331         glGetIntegerv(bindings[i], &old_bindings[i]);
1332     }
1333 #endif
1334
1335     dumpParameters(json);
1336     dumpShadersUniforms(json);
1337     dumpTextures(json);
1338     dumpFramebuffer(json);
1339
1340 #ifndef NDEBUG
1341     for (unsigned i = 0; i < NUM_BINDINGS; ++i) {
1342         GLint new_binding = 0;
1343         glGetIntegerv(bindings[i], &new_binding);
1344         if (new_binding != old_bindings[i]) {
1345             std::cerr << "warning: " << enumToString(bindings[i]) << " was clobbered\n";
1346         }
1347     }
1348 #endif
1349
1350 }
1351
1352
1353 } /* namespace glstate */