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 #include "glstate_internal.hpp"
  40
  41
  42 #ifdef __APPLE__
  43
  44 #include <Carbon/Carbon.h>
  45
  46 #ifdef __cplusplus
  47 extern "C" {
  48 #endif
  49
  50 OSStatus CGSGetSurfaceBounds(CGSConnectionID, CGWindowID, CGSSurfaceID, CGRect *);
  51
  52 #ifdef __cplusplus
  53 }
  54 #endif
  55
  56 #endif /* __APPLE__ */
  57
  58
  59 namespace glstate {
  60
  61
  62 Context::Context(void) {
  63     memset(this, 0, sizeof *this);
  64
  65     const char *version = (const char *)glGetString(GL_VERSION);
  66     if (version) {
  67         if (version[0] == 'O' &&
  68             version[1] == 'p' &&
  69             version[2] == 'e' &&
  70             version[3] == 'n' &&
  71             version[4] == 'G' &&
  72             version[5] == 'L' &&
  73             version[6] == ' ' &&
  74             version[7] == 'E' &&
  75             version[8] == 'S' &&
  76             version[9] == ' ') {
  77             ES = true;
  78         }
  79     }
  80
  81     ARB_draw_buffers = !ES;
  82
  83     // TODO: Check extensions we use below
  84 }
  85
  86 void
  87 Context::resetPixelPackState(void) {
  88     if (!ES) {
  89         glPushClientAttrib(GL_CLIENT_PIXEL_STORE_BIT);
  90         glBindBuffer(GL_PIXEL_PACK_BUFFER, 0);
  91         glPixelStorei(GL_PACK_SWAP_BYTES, GL_FALSE);
  92         glPixelStorei(GL_PACK_LSB_FIRST, GL_FALSE);
  93         glPixelStorei(GL_PACK_ROW_LENGTH, 0);
  94         glPixelStorei(GL_PACK_IMAGE_HEIGHT, 0);
  95         glPixelStorei(GL_PACK_SKIP_ROWS, 0);
  96         glPixelStorei(GL_PACK_SKIP_PIXELS, 0);
  97         glPixelStorei(GL_PACK_SKIP_IMAGES, 0);
  98     } else {
  99         packAlignment = 4;
 100         glGetIntegerv(GL_PACK_ALIGNMENT, &packAlignment);
 101     }
 102     glPixelStorei(GL_PACK_ALIGNMENT, 1);
 103 }
 104
 105 void
 106 Context::restorePixelPackState(void) {
 107     if (!ES) {
 108         glPopClientAttrib();
 109     } else {
 110         glPixelStorei(GL_PACK_ALIGNMENT, packAlignment);
 111     }
 112 }
 113
 114
 115 // Mapping from shader type to shader source, used to accumulated the sources
 116 // of different shaders with same type.
 117 typedef std::map<std::string, std::string> ShaderMap;
 118
 119
 120 static void
 121 getShaderSource(ShaderMap &shaderMap, GLuint shader)
 122 {
 123     if (!shader) {
 124         return;
 125     }
 126
 127     GLint shader_type = 0;
 128     glGetShaderiv(shader, GL_SHADER_TYPE, &shader_type);
 129     if (!shader_type) {
 130         return;
 131     }
 132
 133     GLint source_length = 0;
 134     glGetShaderiv(shader, GL_SHADER_SOURCE_LENGTH, &source_length);
 135     if (!source_length) {
 136         return;
 137     }
 138
 139     GLchar *source = new GLchar[source_length];
 140     GLsizei length = 0;
 141     source[0] = 0;
 142     glGetShaderSource(shader, source_length, &length, source);
 143
 144     shaderMap[enumToString(shader_type)] += source;
 145
 146     delete [] source;
 147 }
 148
 149
 150 static void
 151 getShaderObjSource(ShaderMap &shaderMap, GLhandleARB shaderObj)
 152 {
 153     if (!shaderObj) {
 154         return;
 155     }
 156
 157     GLint object_type = 0;
 158     glGetObjectParameterivARB(shaderObj, GL_OBJECT_TYPE_ARB, &object_type);
 159     if (object_type != GL_SHADER_OBJECT_ARB) {
 160         return;
 161     }
 162
 163     GLint shader_type = 0;
 164     glGetObjectParameterivARB(shaderObj, GL_OBJECT_SUBTYPE_ARB, &shader_type);
 165     if (!shader_type) {
 166         return;
 167     }
 168
 169     GLint source_length = 0;
 170     glGetObjectParameterivARB(shaderObj, GL_OBJECT_SHADER_SOURCE_LENGTH_ARB, &source_length);
 171     if (!source_length) {
 172         return;
 173     }
 174
 175     GLcharARB *source = new GLcharARB[source_length];
 176     GLsizei length = 0;
 177     source[0] = 0;
 178     glGetShaderSource(shaderObj, source_length, &length, source);
 179
 180     shaderMap[enumToString(shader_type)] += source;
 181
 182     delete [] source;
 183 }
 184
 185
 186 static inline void
 187 dumpProgram(JSONWriter &json, GLint program)
 188 {
 189     GLint attached_shaders = 0;
 190     glGetProgramiv(program, GL_ATTACHED_SHADERS, &attached_shaders);
 191     if (!attached_shaders) {
 192         return;
 193     }
 194
 195     ShaderMap shaderMap;
 196
 197     GLuint *shaders = new GLuint[attached_shaders];
 198     GLsizei count = 0;
 199     glGetAttachedShaders(program, attached_shaders, &count, shaders);
 200     std::sort(shaders, shaders + count);
 201     for (GLsizei i = 0; i < count; ++ i) {
 202        getShaderSource(shaderMap, shaders[i]);
 203     }
 204     delete [] shaders;
 205
 206     for (ShaderMap::const_iterator it = shaderMap.begin(); it != shaderMap.end(); ++it) {
 207         json.beginMember(it->first);
 208         json.writeString(it->second);
 209         json.endMember();
 210     }
 211 }
 212
 213
 214 static inline void
 215 dumpProgramObj(JSONWriter &json, GLhandleARB programObj)
 216 {
 217     GLint attached_shaders = 0;
 218     glGetObjectParameterivARB(programObj, GL_OBJECT_ATTACHED_OBJECTS_ARB, &attached_shaders);
 219     if (!attached_shaders) {
 220         return;
 221     }
 222
 223     ShaderMap shaderMap;
 224
 225     GLhandleARB *shaderObjs = new GLhandleARB[attached_shaders];
 226     GLsizei count = 0;
 227     glGetAttachedObjectsARB(programObj, attached_shaders, &count, shaderObjs);
 228     std::sort(shaderObjs, shaderObjs + count);
 229     for (GLsizei i = 0; i < count; ++ i) {
 230        getShaderObjSource(shaderMap, shaderObjs[i]);
 231     }
 232     delete [] shaderObjs;
 233
 234     for (ShaderMap::const_iterator it = shaderMap.begin(); it != shaderMap.end(); ++it) {
 235         json.beginMember(it->first);
 236         json.writeString(it->second);
 237         json.endMember();
 238     }
 239 }
 240
 241 /*
 242  * When fetching the uniform name of an array we usually get name[0]
 243  * so we need to cut the trailing "[0]" in order to properly construct
 244  * array names later. Otherwise we endup with stuff like
 245  * uniformArray[0][0],
 246  * uniformArray[0][1],
 247  * instead of
 248  * uniformArray[0],
 249  * uniformArray[1].
 250  */
 251 static std::string
 252 resolveUniformName(const GLchar *name,  GLint size)
 253 {
 254     std::string qualifiedName(name);
 255     if (size > 1) {
 256         std::string::size_type nameLength = qualifiedName.length();
 257         static const char * const arrayStart = "[0]";
 258         static const int arrayStartLen = 3;
 259         if (qualifiedName.rfind(arrayStart) == (nameLength - arrayStartLen)) {
 260             qualifiedName = qualifiedName.substr(0, nameLength - 3);
 261         }
 262     }
 263     return qualifiedName;
 264 }
 265
 266 static void
 267 dumpUniform(JSONWriter &json, GLint program, GLint size, GLenum type, const GLchar *name) {
 268     GLenum elemType;
 269     GLint numElems;
 270     __gl_uniform_size(type, elemType, numElems);
 271     if (elemType == GL_NONE) {
 272         return;
 273     }
 274
 275     GLfloat fvalues[4*4];
 276     GLdouble dvalues[4*4];
 277     GLint ivalues[4*4];
 278     GLuint uivalues[4*4];
 279
 280     GLint i, j;
 281
 282     std::string qualifiedName = resolveUniformName(name, size);
 283
 284     for (i = 0; i < size; ++i) {
 285         std::stringstream ss;
 286         ss << qualifiedName;
 287
 288         if (size > 1) {
 289             ss << '[' << i << ']';
 290         }
 291
 292         std::string elemName = ss.str();
 293
 294         json.beginMember(elemName);
 295
 296         GLint location = glGetUniformLocation(program, elemName.c_str());
 297
 298         if (numElems > 1) {
 299             json.beginArray();
 300         }
 301
 302         switch (elemType) {
 303         case GL_FLOAT:
 304             glGetUniformfv(program, location, fvalues);
 305             for (j = 0; j < numElems; ++j) {
 306                 json.writeNumber(fvalues[j]);
 307             }
 308             break;
 309         case GL_DOUBLE:
 310             glGetUniformdv(program, location, dvalues);
 311             for (j = 0; j < numElems; ++j) {
 312                 json.writeNumber(dvalues[j]);
 313             }
 314             break;
 315         case GL_INT:
 316             glGetUniformiv(program, location, ivalues);
 317             for (j = 0; j < numElems; ++j) {
 318                 json.writeNumber(ivalues[j]);
 319             }
 320             break;
 321         case GL_UNSIGNED_INT:
 322             glGetUniformuiv(program, location, uivalues);
 323             for (j = 0; j < numElems; ++j) {
 324                 json.writeNumber(uivalues[j]);
 325             }
 326             break;
 327         case GL_BOOL:
 328             glGetUniformiv(program, location, ivalues);
 329             for (j = 0; j < numElems; ++j) {
 330                 json.writeBool(ivalues[j]);
 331             }
 332             break;
 333         default:
 334             assert(0);
 335             break;
 336         }
 337
 338         if (numElems > 1) {
 339             json.endArray();
 340         }
 341
 342         json.endMember();
 343     }
 344 }
 345
 346
 347 static void
 348 dumpUniformARB(JSONWriter &json, GLhandleARB programObj, GLint size, GLenum type, const GLchar *name) {
 349
 350     GLenum elemType;
 351     GLint numElems;
 352     __gl_uniform_size(type, elemType, numElems);
 353     if (elemType == GL_NONE) {
 354         return;
 355     }
 356
 357     GLfloat fvalues[4*4];
 358     GLint ivalues[4*4];
 359
 360     GLint i, j;
 361
 362     std::string qualifiedName = resolveUniformName(name, size);
 363
 364     for (i = 0; i < size; ++i) {
 365         std::stringstream ss;
 366         ss << qualifiedName;
 367
 368         if (size > 1) {
 369             ss << '[' << i << ']';
 370         }
 371
 372         std::string elemName = ss.str();
 373
 374         json.beginMember(elemName);
 375
 376         GLint location = glGetUniformLocationARB(programObj, elemName.c_str());
 377
 378         if (numElems > 1) {
 379             json.beginArray();
 380         }
 381
 382         switch (elemType) {
 383         case GL_DOUBLE:
 384             // glGetUniformdvARB does not exists
 385         case GL_FLOAT:
 386             glGetUniformfvARB(programObj, location, fvalues);
 387             for (j = 0; j < numElems; ++j) {
 388                 json.writeNumber(fvalues[j]);
 389             }
 390             break;
 391         case GL_UNSIGNED_INT:
 392             // glGetUniformuivARB does not exists
 393         case GL_INT:
 394             glGetUniformivARB(programObj, location, ivalues);
 395             for (j = 0; j < numElems; ++j) {
 396                 json.writeNumber(ivalues[j]);
 397             }
 398             break;
 399         case GL_BOOL:
 400             glGetUniformivARB(programObj, location, ivalues);
 401             for (j = 0; j < numElems; ++j) {
 402                 json.writeBool(ivalues[j]);
 403             }
 404             break;
 405         default:
 406             assert(0);
 407             break;
 408         }
 409
 410         if (numElems > 1) {
 411             json.endArray();
 412         }
 413
 414         json.endMember();
 415     }
 416 }
 417
 418
 419 static inline void
 420 dumpProgramUniforms(JSONWriter &json, GLint program)
 421 {
 422     GLint active_uniforms = 0;
 423     glGetProgramiv(program, GL_ACTIVE_UNIFORMS, &active_uniforms);
 424     if (!active_uniforms) {
 425         return;
 426     }
 427
 428     GLint active_uniform_max_length = 0;
 429     glGetProgramiv(program, GL_ACTIVE_UNIFORM_MAX_LENGTH, &active_uniform_max_length);
 430     GLchar *name = new GLchar[active_uniform_max_length];
 431     if (!name) {
 432         return;
 433     }
 434
 435     for (GLint index = 0; index < active_uniforms; ++index) {
 436         GLsizei length = 0;
 437         GLint size = 0;
 438         GLenum type = GL_NONE;
 439         glGetActiveUniform(program, index, active_uniform_max_length, &length, &size, &type, name);
 440
 441         dumpUniform(json, program, size, type, name);
 442     }
 443
 444     delete [] name;
 445 }
 446
 447
 448 static inline void
 449 dumpProgramObjUniforms(JSONWriter &json, GLhandleARB programObj)
 450 {
 451     GLint active_uniforms = 0;
 452     glGetObjectParameterivARB(programObj, GL_OBJECT_ACTIVE_UNIFORMS_ARB, &active_uniforms);
 453     if (!active_uniforms) {
 454         return;
 455     }
 456
 457     GLint active_uniform_max_length = 0;
 458     glGetObjectParameterivARB(programObj, GL_OBJECT_ACTIVE_UNIFORM_MAX_LENGTH_ARB, &active_uniform_max_length);
 459     GLchar *name = new GLchar[active_uniform_max_length];
 460     if (!name) {
 461         return;
 462     }
 463
 464     for (GLint index = 0; index < active_uniforms; ++index) {
 465         GLsizei length = 0;
 466         GLint size = 0;
 467         GLenum type = GL_NONE;
 468         glGetActiveUniformARB(programObj, index, active_uniform_max_length, &length, &size, &type, name);
 469
 470         dumpUniformARB(json, programObj, size, type, name);
 471     }
 472
 473     delete [] name;
 474 }
 475
 476
 477 static inline void
 478 dumpArbProgram(JSONWriter &json, GLenum target)
 479 {
 480     if (!glIsEnabled(target)) {
 481         return;
 482     }
 483
 484     GLint program_length = 0;
 485     glGetProgramivARB(target, GL_PROGRAM_LENGTH_ARB, &program_length);
 486     if (!program_length) {
 487         return;
 488     }
 489
 490     GLchar *source = new GLchar[program_length + 1];
 491     source[0] = 0;
 492     glGetProgramStringARB(target, GL_PROGRAM_STRING_ARB, source);
 493     source[program_length] = 0;
 494
 495     json.beginMember(enumToString(target));
 496     json.writeString(source);
 497     json.endMember();
 498
 499     delete [] source;
 500 }
 501
 502
 503 static inline void
 504 dumpArbProgramUniforms(JSONWriter &json, GLenum target, const char *prefix)
 505 {
 506     if (!glIsEnabled(target)) {
 507         return;
 508     }
 509
 510     GLint program_parameters = 0;
 511     glGetProgramivARB(target, GL_PROGRAM_PARAMETERS_ARB, &program_parameters);
 512     if (!program_parameters) {
 513         return;
 514     }
 515
 516     GLint max_program_local_parameters = 0;
 517     glGetProgramivARB(target, GL_MAX_PROGRAM_LOCAL_PARAMETERS_ARB, &max_program_local_parameters);
 518     for (GLint index = 0; index < max_program_local_parameters; ++index) {
 519         GLdouble params[4] = {0, 0, 0, 0};
 520         glGetProgramLocalParameterdvARB(target, index, params);
 521
 522         if (!params[0] && !params[1] && !params[2] && !params[3]) {
 523             continue;
 524         }
 525
 526         char name[256];
 527         snprintf(name, sizeof name, "%sprogram.local[%i]", prefix, index);
 528
 529         json.beginMember(name);
 530         json.beginArray();
 531         json.writeNumber(params[0]);
 532         json.writeNumber(params[1]);
 533         json.writeNumber(params[2]);
 534         json.writeNumber(params[3]);
 535         json.endArray();
 536         json.endMember();
 537     }
 538
 539     GLint max_program_env_parameters = 0;
 540     glGetProgramivARB(target, GL_MAX_PROGRAM_ENV_PARAMETERS_ARB, &max_program_env_parameters);
 541     for (GLint index = 0; index < max_program_env_parameters; ++index) {
 542         GLdouble params[4] = {0, 0, 0, 0};
 543         glGetProgramEnvParameterdvARB(target, index, params);
 544
 545         if (!params[0] && !params[1] && !params[2] && !params[3]) {
 546             continue;
 547         }
 548
 549         char name[256];
 550         snprintf(name, sizeof name, "%sprogram.env[%i]", prefix, index);
 551
 552         json.beginMember(name);
 553         json.beginArray();
 554         json.writeNumber(params[0]);
 555         json.writeNumber(params[1]);
 556         json.writeNumber(params[2]);
 557         json.writeNumber(params[3]);
 558         json.endArray();
 559         json.endMember();
 560     }
 561 }
 562
 563
 564 static inline void
 565 dumpShadersUniforms(JSONWriter &json)
 566 {
 567     GLint program = 0;
 568     glGetIntegerv(GL_CURRENT_PROGRAM, &program);
 569
 570     GLhandleARB programObj = glGetHandleARB(GL_PROGRAM_OBJECT_ARB);
 571
 572     json.beginMember("shaders");
 573     json.beginObject();
 574     if (program) {
 575         dumpProgram(json, program);
 576     } else if (programObj) {
 577         dumpProgramObj(json, programObj);
 578     } else {
 579         dumpArbProgram(json, GL_FRAGMENT_PROGRAM_ARB);
 580         dumpArbProgram(json, GL_VERTEX_PROGRAM_ARB);
 581     }
 582     json.endObject();
 583     json.endMember(); // shaders
 584
 585     json.beginMember("uniforms");
 586     json.beginObject();
 587     if (program) {
 588         dumpProgramUniforms(json, program);
 589     } else if (programObj) {
 590         dumpProgramObjUniforms(json, programObj);
 591     } else {
 592         dumpArbProgramUniforms(json, GL_FRAGMENT_PROGRAM_ARB, "fp.");
 593         dumpArbProgramUniforms(json, GL_VERTEX_PROGRAM_ARB, "vp.");
 594     }
 595     json.endObject();
 596     json.endMember(); // uniforms
 597 }
 598
 599
 600 static inline void
 601 dumpTextureImage(JSONWriter &json, Context &context, GLenum target, GLint level)
 602 {
 603     GLint width, height = 1, depth = 1;
 604     GLint format;
 605
 606     glGetTexLevelParameteriv(target, level, GL_TEXTURE_INTERNAL_FORMAT, &format);
 607
 608     width = 0;
 609     glGetTexLevelParameteriv(target, level, GL_TEXTURE_WIDTH, &width);
 610
 611     if (target != GL_TEXTURE_1D) {
 612         height = 0;
 613         glGetTexLevelParameteriv(target, level, GL_TEXTURE_HEIGHT, &height);
 614         if (target == GL_TEXTURE_3D) {
 615             depth = 0;
 616             glGetTexLevelParameteriv(target, level, GL_TEXTURE_DEPTH, &depth);
 617         }
 618     }
 619
 620     if (width <= 0 || height <= 0 || depth <= 0) {
 621         return;
 622     } else {
 623         char label[512];
 624
 625         GLint active_texture = GL_TEXTURE0;
 626         glGetIntegerv(GL_ACTIVE_TEXTURE, &active_texture);
 627         snprintf(label, sizeof label, "%s, %s, level = %d",
 628                  enumToString(active_texture), enumToString(target), level);
 629
 630         json.beginMember(label);
 631
 632         json.beginObject();
 633
 634         // Tell the GUI this is no ordinary object, but an image
 635         json.writeStringMember("__class__", "image");
 636
 637         json.writeNumberMember("__width__", width);
 638         json.writeNumberMember("__height__", height);
 639         json.writeNumberMember("__depth__", depth);
 640
 641         json.writeStringMember("__format__", enumToString(format));
 642
 643         // Hardcoded for now, but we could chose types more adequate to the
 644         // texture internal format
 645         json.writeStringMember("__type__", "uint8");
 646         json.writeBoolMember("__normalized__", true);
 647         json.writeNumberMember("__channels__", 4);
 648
 649         GLubyte *pixels = new GLubyte[depth*width*height*4];
 650
 651         context.resetPixelPackState();
 652
 653         glGetTexImage(target, level, GL_RGBA, GL_UNSIGNED_BYTE, pixels);
 654
 655         context.restorePixelPackState();
 656
 657         json.beginMember("__data__");
 658         char *pngBuffer;
 659         int pngBufferSize;
 660         image::writePixelsToBuffer(pixels, width, height, 4, true, &pngBuffer, &pngBufferSize);
 661         json.writeBase64(pngBuffer, pngBufferSize);
 662         free(pngBuffer);
 663         json.endMember(); // __data__
 664
 665         delete [] pixels;
 666         json.endObject();
 667     }
 668 }
 669
 670
 671 static inline void
 672 dumpTexture(JSONWriter &json, Context &context, GLenum target, GLenum binding)
 673 {
 674     GLint texture_binding = 0;
 675     glGetIntegerv(binding, &texture_binding);
 676     if (!glIsEnabled(target) && !texture_binding) {
 677         return;
 678     }
 679
 680     GLint level = 0;
 681     do {
 682         GLint width = 0, height = 0;
 683         glGetTexLevelParameteriv(target, level, GL_TEXTURE_WIDTH, &width);
 684         glGetTexLevelParameteriv(target, level, GL_TEXTURE_HEIGHT, &height);
 685         if (!width || !height) {
 686             break;
 687         }
 688
 689         if (target == GL_TEXTURE_CUBE_MAP) {
 690             for (int face = 0; face < 6; ++face) {
 691                 dumpTextureImage(json, context, GL_TEXTURE_CUBE_MAP_POSITIVE_X + face, level);
 692             }
 693         } else {
 694             dumpTextureImage(json, context, target, level);
 695         }
 696
 697         ++level;
 698     } while(true);
 699 }
 700
 701
 702 static inline void
 703 dumpTextures(JSONWriter &json, Context &context)
 704 {
 705     json.beginMember("textures");
 706     json.beginObject();
 707     GLint active_texture = GL_TEXTURE0;
 708     glGetIntegerv(GL_ACTIVE_TEXTURE, &active_texture);
 709     GLint max_texture_coords = 0;
 710     glGetIntegerv(GL_MAX_TEXTURE_COORDS, &max_texture_coords);
 711     GLint max_combined_texture_image_units = 0;
 712     glGetIntegerv(GL_MAX_COMBINED_TEXTURE_IMAGE_UNITS, &max_combined_texture_image_units);
 713     GLint max_units = std::max(max_combined_texture_image_units, max_texture_coords);
 714     for (GLint unit = 0; unit < max_units; ++unit) {
 715         GLenum texture = GL_TEXTURE0 + unit;
 716         glActiveTexture(texture);
 717         dumpTexture(json, context, GL_TEXTURE_1D, GL_TEXTURE_BINDING_1D);
 718         dumpTexture(json, context, GL_TEXTURE_2D, GL_TEXTURE_BINDING_2D);
 719         dumpTexture(json, context, GL_TEXTURE_3D, GL_TEXTURE_BINDING_3D);
 720         dumpTexture(json, context, GL_TEXTURE_RECTANGLE, GL_TEXTURE_BINDING_RECTANGLE);
 721         dumpTexture(json, context, GL_TEXTURE_CUBE_MAP, GL_TEXTURE_BINDING_CUBE_MAP);
 722     }
 723     glActiveTexture(active_texture);
 724     json.endObject();
 725     json.endMember(); // textures
 726 }
 727
 728
 729 static bool
 730 getDrawableBounds(GLint *width, GLint *height) {
 731 #if defined(TRACE_EGL)
 732
 733     EGLContext currentContext = eglGetCurrentContext();
 734     if (currentContext == EGL_NO_CONTEXT) {
 735         return false;
 736     }
 737
 738     EGLSurface currentSurface = eglGetCurrentSurface(EGL_DRAW);
 739     if (currentSurface == EGL_NO_SURFACE) {
 740         return false;
 741     }
 742
 743     EGLDisplay currentDisplay = eglGetCurrentDisplay();
 744     if (currentDisplay == EGL_NO_DISPLAY) {
 745         return false;
 746     }
 747
 748     if (!eglQuerySurface(currentDisplay, currentSurface, EGL_WIDTH, width) ||
 749         !eglQuerySurface(currentDisplay, currentSurface, EGL_HEIGHT, height)) {
 750         return false;
 751     }
 752
 753     return true;
 754
 755 #elif defined(_WIN32)
 756
 757     HDC hDC = wglGetCurrentDC();
 758     if (!hDC) {
 759         return false;
 760     }
 761
 762     HWND hWnd = WindowFromDC(hDC);
 763     RECT rect;
 764
 765     if (!GetClientRect(hWnd, &rect)) {
 766        return false;
 767     }
 768
 769     *width  = rect.right  - rect.left;
 770     *height = rect.bottom - rect.top;
 771     return true;
 772
 773 #elif defined(__APPLE__)
 774
 775     CGLContextObj ctx = CGLGetCurrentContext();
 776     if (ctx == NULL) {
 777         return false;
 778     }
 779
 780     CGSConnectionID cid;
 781     CGSWindowID wid;
 782     CGSSurfaceID sid;
 783
 784     if (CGLGetSurface(ctx, &cid, &wid, &sid) != kCGLNoError) {
 785         return false;
 786     }
 787
 788     CGRect rect;
 789
 790     if (CGSGetSurfaceBounds(cid, wid, sid, &rect) != 0) {
 791         return false;
 792     }
 793
 794     *width = rect.size.width;
 795     *height = rect.size.height;
 796     return true;
 797
 798 #elif defined(HAVE_X11)
 799
 800     Display *display;
 801     Drawable drawable;
 802     Window root;
 803     int x, y;
 804     unsigned int w, h, bw, depth;
 805
 806     display = glXGetCurrentDisplay();
 807     if (!display) {
 808         return false;
 809     }
 810
 811     drawable = glXGetCurrentDrawable();
 812     if (drawable == None) {
 813         return false;
 814     }
 815
 816     if (!XGetGeometry(display, drawable, &root, &x, &y, &w, &h, &bw, &depth)) {
 817         return false;
 818     }
 819
 820     *width = w;
 821     *height = h;
 822     return true;
 823
 824 #else
 825
 826     return false;
 827
 828 #endif
 829 }
 830
 831
 832 static const GLenum texture_bindings[][2] = {
 833     {GL_TEXTURE_1D, GL_TEXTURE_BINDING_1D},
 834     {GL_TEXTURE_2D, GL_TEXTURE_BINDING_2D},
 835     {GL_TEXTURE_3D, GL_TEXTURE_BINDING_3D},
 836     {GL_TEXTURE_RECTANGLE, GL_TEXTURE_BINDING_RECTANGLE},
 837     {GL_TEXTURE_CUBE_MAP, GL_TEXTURE_BINDING_CUBE_MAP}
 838 };
 839
 840
 841 static bool
 842 bindTexture(GLint texture, GLenum &target, GLint &bound_texture)
 843 {
 844
 845     for (unsigned i = 0; i < sizeof(texture_bindings)/sizeof(texture_bindings[0]); ++i) {
 846         target  = texture_bindings[i][0];
 847
 848         GLenum binding = texture_bindings[i][1];
 849
 850         while (glGetError() != GL_NO_ERROR)
 851             ;
 852
 853         glGetIntegerv(binding, &bound_texture);
 854         glBindTexture(target, texture);
 855
 856         if (glGetError() == GL_NO_ERROR) {
 857             return true;
 858         }
 859
 860         glBindTexture(target, bound_texture);
 861     }
 862
 863     target = GL_NONE;
 864
 865     return false;
 866 }
 867
 868
 869 static bool
 870 getTextureLevelSize(GLint texture, GLint level, GLint *width, GLint *height)
 871 {
 872     *width = 0;
 873     *height = 0;
 874
 875     GLenum target;
 876     GLint bound_texture = 0;
 877     if (!bindTexture(texture, target, bound_texture)) {
 878         return false;
 879     }
 880
 881     glGetTexLevelParameteriv(target, level, GL_TEXTURE_WIDTH, width);
 882     glGetTexLevelParameteriv(target, level, GL_TEXTURE_HEIGHT, height);
 883
 884     glBindTexture(target, bound_texture);
 885
 886     return *width > 0 && *height > 0;
 887 }
 888
 889
 890 static GLenum
 891 getTextureLevelFormat(GLint texture, GLint level)
 892 {
 893     GLenum target;
 894     GLint bound_texture = 0;
 895     if (!bindTexture(texture, target, bound_texture)) {
 896         return GL_NONE;
 897     }
 898
 899     GLint format = GL_NONE;
 900     glGetTexLevelParameteriv(target, level, GL_TEXTURE_INTERNAL_FORMAT, &format);
 901
 902     glBindTexture(target, bound_texture);
 903
 904     return format;
 905 }
 906
 907
 908
 909 static bool
 910 getRenderbufferSize(GLint renderbuffer, GLint *width, GLint *height)
 911 {
 912     GLint bound_renderbuffer = 0;
 913     glGetIntegerv(GL_RENDERBUFFER_BINDING, &bound_renderbuffer);
 914     glBindRenderbuffer(GL_RENDERBUFFER, renderbuffer);
 915
 916     *width = 0;
 917     *height = 0;
 918     glGetRenderbufferParameteriv(GL_RENDERBUFFER, GL_RENDERBUFFER_WIDTH, width);
 919     glGetRenderbufferParameteriv(GL_RENDERBUFFER, GL_RENDERBUFFER_HEIGHT, height);
 920
 921     glBindRenderbuffer(GL_RENDERBUFFER, bound_renderbuffer);
 922
 923     return *width > 0 && *height > 0;
 924 }
 925
 926
 927 static GLenum
 928 getRenderbufferFormat(GLint renderbuffer)
 929 {
 930     GLint bound_renderbuffer = 0;
 931     glGetIntegerv(GL_RENDERBUFFER_BINDING, &bound_renderbuffer);
 932     glBindRenderbuffer(GL_RENDERBUFFER, renderbuffer);
 933
 934     GLint format = GL_NONE;
 935     glGetRenderbufferParameteriv(GL_RENDERBUFFER, GL_RENDERBUFFER_INTERNAL_FORMAT, &format);
 936
 937     glBindRenderbuffer(GL_RENDERBUFFER, bound_renderbuffer);
 938
 939     return format;
 940 }
 941
 942
 943 static bool
 944 getFramebufferAttachmentSize(GLenum target, GLenum attachment, GLint *width, GLint *height)
 945 {
 946     GLint object_type = GL_NONE;
 947     glGetFramebufferAttachmentParameteriv(target, attachment,
 948                                           GL_FRAMEBUFFER_ATTACHMENT_OBJECT_TYPE,
 949                                           &object_type);
 950     if (object_type == GL_NONE) {
 951         return false;
 952     }
 953
 954     GLint object_name = 0;
 955     glGetFramebufferAttachmentParameteriv(target, attachment,
 956                                           GL_FRAMEBUFFER_ATTACHMENT_OBJECT_NAME,
 957                                           &object_name);
 958     if (object_name == 0) {
 959         return false;
 960     }
 961
 962     if (object_type == GL_RENDERBUFFER) {
 963         return getRenderbufferSize(object_name, width, height);
 964     } else if (object_type == GL_TEXTURE) {
 965         GLint texture_level = 0;
 966         glGetFramebufferAttachmentParameteriv(target, attachment,
 967                                               GL_FRAMEBUFFER_ATTACHMENT_TEXTURE_LEVEL,
 968                                               &texture_level);
 969         return getTextureLevelSize(object_name, texture_level, width, height);
 970     } else {
 971         std::cerr << "warning: unexpected GL_FRAMEBUFFER_ATTACHMENT_OBJECT_TYPE = " << object_type << "\n";
 972         return false;
 973     }
 974 }
 975
 976
 977
 978 static GLint
 979 getFramebufferAttachmentFormat(GLenum target, GLenum attachment)
 980 {
 981     GLint object_type = GL_NONE;
 982     glGetFramebufferAttachmentParameteriv(target, attachment,
 983                                           GL_FRAMEBUFFER_ATTACHMENT_OBJECT_TYPE,
 984                                           &object_type);
 985     if (object_type == GL_NONE) {
 986         return GL_NONE;
 987     }
 988
 989     GLint object_name = 0;
 990     glGetFramebufferAttachmentParameteriv(target, attachment,
 991                                           GL_FRAMEBUFFER_ATTACHMENT_OBJECT_NAME,
 992                                           &object_name);
 993     if (object_name == 0) {
 994         return GL_NONE;
 995     }
 996
 997     if (object_type == GL_RENDERBUFFER) {
 998         return getRenderbufferFormat(object_name);
 999     } else if (object_type == GL_TEXTURE) {
1000         GLint texture_level = 0;
1001         glGetFramebufferAttachmentParameteriv(target, attachment,
1002                                               GL_FRAMEBUFFER_ATTACHMENT_TEXTURE_LEVEL,
1003                                               &texture_level);
1004         return getTextureLevelFormat(object_name, texture_level);
1005     } else {
1006         std::cerr << "warning: unexpected GL_FRAMEBUFFER_ATTACHMENT_OBJECT_TYPE = " << object_type << "\n";
1007         return GL_NONE;
1008     }
1009 }
1010
1011
1012
1013 image::Image *
1014 getDrawBufferImage() {
1015     GLenum format = GL_RGB;
1016     GLint channels = __gl_format_channels(format);
1017     if (channels > 4) {
1018         return NULL;
1019     }
1020
1021     Context context;
1022
1023     GLenum framebuffer_binding;
1024     GLenum framebuffer_target;
1025     if (context.ES) {
1026         framebuffer_binding = GL_FRAMEBUFFER_BINDING;
1027         framebuffer_target = GL_FRAMEBUFFER;
1028     } else {
1029         framebuffer_binding = GL_DRAW_FRAMEBUFFER_BINDING;
1030         framebuffer_target = GL_DRAW_FRAMEBUFFER;
1031     }
1032
1033     GLint draw_framebuffer = 0;
1034     glGetIntegerv(framebuffer_binding, &draw_framebuffer);
1035
1036     GLint draw_buffer = GL_NONE;
1037     GLint width, height;
1038     if (draw_framebuffer) {
1039         if (context.ARB_draw_buffers) {
1040             glGetIntegerv(GL_DRAW_BUFFER0, &draw_buffer);
1041             if (draw_buffer == GL_NONE) {
1042                 return NULL;
1043             }
1044         }
1045
1046         if (!getFramebufferAttachmentSize(framebuffer_target, draw_buffer, &width, &height)) {
1047             return NULL;
1048         }
1049     } else {
1050         if (!context.ES) {
1051             glGetIntegerv(GL_DRAW_BUFFER, &draw_buffer);
1052             if (draw_buffer == GL_NONE) {
1053                 return NULL;
1054             }
1055         }
1056
1057         if (!getDrawableBounds(&width, &height)) {
1058             return NULL;
1059         }
1060     }
1061
1062     image::Image *image = new image::Image(width, height, channels, true);
1063     if (!image) {
1064         return NULL;
1065     }
1066
1067     while (glGetError() != GL_NO_ERROR) {}
1068
1069     GLint read_framebuffer = 0;
1070     GLint read_buffer = 0;
1071     if (!context.ES) {
1072         glGetIntegerv(GL_READ_FRAMEBUFFER_BINDING, &read_framebuffer);
1073         glBindFramebuffer(GL_READ_FRAMEBUFFER, draw_framebuffer);
1074
1075         glGetIntegerv(GL_READ_BUFFER, &read_buffer);
1076         glReadBuffer(draw_buffer);
1077     }
1078
1079     // TODO: reset imaging state too
1080     context.resetPixelPackState();
1081
1082     glReadPixels(0, 0, width, height, format, GL_UNSIGNED_BYTE, image->pixels);
1083
1084     context.restorePixelPackState();
1085
1086     if (!context.ES) {
1087         glReadBuffer(read_buffer);
1088         glBindFramebuffer(GL_READ_FRAMEBUFFER, read_framebuffer);
1089     }
1090
1091     GLenum error = glGetError();
1092     if (error != GL_NO_ERROR) {
1093         do {
1094             std::cerr << "warning: " << enumToString(error) << " while getting snapshot\n";
1095             error = glGetError();
1096         } while(error != GL_NO_ERROR);
1097         delete image;
1098         return NULL;
1099     }
1100
1101     return image;
1102 }
1103
1104
1105 /**
1106  * Dump the image of the currently bound read buffer.
1107  */
1108 static inline void
1109 dumpReadBufferImage(JSONWriter &json, GLint width, GLint height, GLenum format,
1110                     GLint internalFormat = GL_NONE)
1111 {
1112     GLint channels = __gl_format_channels(format);
1113
1114     Context context;
1115
1116     json.beginObject();
1117
1118     // Tell the GUI this is no ordinary object, but an image
1119     json.writeStringMember("__class__", "image");
1120
1121     json.writeNumberMember("__width__", width);
1122     json.writeNumberMember("__height__", height);
1123     json.writeNumberMember("__depth__", 1);
1124
1125     json.writeStringMember("__format__", enumToString(internalFormat));
1126
1127     // Hardcoded for now, but we could chose types more adequate to the
1128     // texture internal format
1129     json.writeStringMember("__type__", "uint8");
1130     json.writeBoolMember("__normalized__", true);
1131     json.writeNumberMember("__channels__", channels);
1132
1133     GLubyte *pixels = new GLubyte[width*height*channels];
1134
1135     // TODO: reset imaging state too
1136     context.resetPixelPackState();
1137
1138     glReadPixels(0, 0, width, height, format, GL_UNSIGNED_BYTE, pixels);
1139
1140     context.restorePixelPackState();
1141
1142     json.beginMember("__data__");
1143     char *pngBuffer;
1144     int pngBufferSize;
1145     image::writePixelsToBuffer(pixels, width, height, channels, true, &pngBuffer, &pngBufferSize);
1146     //std::cerr <<" Before = "<<(width * height * channels * sizeof *pixels)
1147     //          <<", after = "<<pngBufferSize << ", ratio = " << double(width * height * channels * sizeof *pixels)/pngBufferSize;
1148     json.writeBase64(pngBuffer, pngBufferSize);
1149     free(pngBuffer);
1150     json.endMember(); // __data__
1151
1152     delete [] pixels;
1153     json.endObject();
1154 }
1155
1156
1157 static inline GLuint
1158 downsampledFramebuffer(GLuint oldFbo, GLint drawbuffer,
1159                        GLint colorRb, GLint depthRb, GLint stencilRb,
1160                        GLuint *rbs, GLint *numRbs)
1161 {
1162     GLuint fbo;
1163     GLint format;
1164     GLint w, h;
1165
1166     *numRbs = 0;
1167
1168     glGenFramebuffers(1, &fbo);
1169     glBindFramebuffer(GL_FRAMEBUFFER, fbo);
1170
1171     glBindRenderbuffer(GL_RENDERBUFFER, colorRb);
1172     glGetRenderbufferParameteriv(GL_RENDERBUFFER,
1173                                  GL_RENDERBUFFER_WIDTH, &w);
1174     glGetRenderbufferParameteriv(GL_RENDERBUFFER,
1175                                  GL_RENDERBUFFER_HEIGHT, &h);
1176     glGetRenderbufferParameteriv(GL_RENDERBUFFER,
1177                                  GL_RENDERBUFFER_INTERNAL_FORMAT, &format);
1178
1179     glGenRenderbuffers(1, &rbs[*numRbs]);
1180     glBindRenderbuffer(GL_RENDERBUFFER, rbs[*numRbs]);
1181     glRenderbufferStorage(GL_RENDERBUFFER, format, w, h);
1182     glFramebufferRenderbuffer(GL_FRAMEBUFFER, drawbuffer,
1183                               GL_RENDERBUFFER, rbs[*numRbs]);
1184
1185     glBindFramebuffer(GL_READ_FRAMEBUFFER, oldFbo);
1186     glBindFramebuffer(GL_DRAW_FRAMEBUFFER, fbo);
1187     glDrawBuffer(drawbuffer);
1188     glReadBuffer(drawbuffer);
1189     glBlitFramebuffer(0, 0, w, h, 0, 0, w, h,
1190                       GL_COLOR_BUFFER_BIT, GL_NEAREST);
1191     glBindFramebuffer(GL_FRAMEBUFFER, fbo);
1192     ++*numRbs;
1193
1194     if (stencilRb == depthRb && stencilRb) {
1195         //combined depth and stencil buffer
1196         glBindRenderbuffer(GL_RENDERBUFFER, depthRb);
1197         glGetRenderbufferParameteriv(GL_RENDERBUFFER,
1198                                      GL_RENDERBUFFER_WIDTH, &w);
1199         glGetRenderbufferParameteriv(GL_RENDERBUFFER,
1200                                      GL_RENDERBUFFER_HEIGHT, &h);
1201         glGetRenderbufferParameteriv(GL_RENDERBUFFER,
1202                                      GL_RENDERBUFFER_INTERNAL_FORMAT, &format);
1203
1204         glGenRenderbuffers(1, &rbs[*numRbs]);
1205         glBindRenderbuffer(GL_RENDERBUFFER, rbs[*numRbs]);
1206         glRenderbufferStorage(GL_RENDERBUFFER, format, w, h);
1207         glFramebufferRenderbuffer(GL_FRAMEBUFFER, GL_DEPTH_STENCIL_ATTACHMENT,
1208                                   GL_RENDERBUFFER, rbs[*numRbs]);
1209         glBindFramebuffer(GL_READ_FRAMEBUFFER, oldFbo);
1210         glBindFramebuffer(GL_DRAW_FRAMEBUFFER, fbo);
1211         glBlitFramebuffer(0, 0, w, h, 0, 0, w, h,
1212                           GL_DEPTH_BUFFER_BIT | GL_STENCIL_BUFFER_BIT, GL_NEAREST);
1213         glBindFramebuffer(GL_FRAMEBUFFER, fbo);
1214         ++*numRbs;
1215     } else {
1216         if (depthRb) {
1217             glBindRenderbuffer(GL_RENDERBUFFER, depthRb);
1218             glGetRenderbufferParameteriv(GL_RENDERBUFFER,
1219                                          GL_RENDERBUFFER_WIDTH, &w);
1220             glGetRenderbufferParameteriv(GL_RENDERBUFFER,
1221                                          GL_RENDERBUFFER_HEIGHT, &h);
1222             glGetRenderbufferParameteriv(GL_RENDERBUFFER,
1223                                          GL_RENDERBUFFER_INTERNAL_FORMAT, &format);
1224
1225             glGenRenderbuffers(1, &rbs[*numRbs]);
1226             glBindRenderbuffer(GL_RENDERBUFFER, rbs[*numRbs]);
1227             glRenderbufferStorage(GL_RENDERBUFFER, format, w, h);
1228             glFramebufferRenderbuffer(GL_FRAMEBUFFER,
1229                                       GL_DEPTH_ATTACHMENT,
1230                                       GL_RENDERBUFFER, rbs[*numRbs]);
1231             glBindFramebuffer(GL_READ_FRAMEBUFFER, oldFbo);
1232             glBindFramebuffer(GL_DRAW_FRAMEBUFFER, fbo);
1233             glDrawBuffer(GL_DEPTH_ATTACHMENT);
1234             glReadBuffer(GL_DEPTH_ATTACHMENT);
1235             glBlitFramebuffer(0, 0, w, h, 0, 0, w, h,
1236                               GL_DEPTH_BUFFER_BIT, GL_NEAREST);
1237             ++*numRbs;
1238         }
1239         if (stencilRb) {
1240             glBindRenderbuffer(GL_RENDERBUFFER, stencilRb);
1241             glGetRenderbufferParameteriv(GL_RENDERBUFFER,
1242                                          GL_RENDERBUFFER_WIDTH, &w);
1243             glGetRenderbufferParameteriv(GL_RENDERBUFFER,
1244                                          GL_RENDERBUFFER_HEIGHT, &h);
1245             glGetRenderbufferParameteriv(GL_RENDERBUFFER,
1246                                      GL_RENDERBUFFER_INTERNAL_FORMAT, &format);
1247
1248             glGenRenderbuffers(1, &rbs[*numRbs]);
1249             glBindRenderbuffer(GL_RENDERBUFFER, rbs[*numRbs]);
1250             glRenderbufferStorage(GL_RENDERBUFFER, format, w, h);
1251             glFramebufferRenderbuffer(GL_FRAMEBUFFER,
1252                                       GL_STENCIL_ATTACHMENT,
1253                                       GL_RENDERBUFFER, rbs[*numRbs]);
1254             glBindFramebuffer(GL_READ_FRAMEBUFFER, oldFbo);
1255             glBindFramebuffer(GL_DRAW_FRAMEBUFFER, fbo);
1256             glDrawBuffer(GL_STENCIL_ATTACHMENT);
1257             glReadBuffer(GL_STENCIL_ATTACHMENT);
1258             glBlitFramebuffer(0, 0, w, h, 0, 0, w, h,
1259                               GL_STENCIL_BUFFER_BIT, GL_NEAREST);
1260             ++*numRbs;
1261         }
1262     }
1263
1264     return fbo;
1265 }
1266
1267
1268 /**
1269  * Dump images of current draw drawable/window.
1270  */
1271 static void
1272 dumpDrawableImages(JSONWriter &json, Context &context)
1273 {
1274     GLint width, height;
1275
1276     if (!getDrawableBounds(&width, &height)) {
1277         return;
1278     }
1279
1280     GLint draw_buffer = GL_NONE;
1281     if (context.ES) {
1282         draw_buffer = GL_BACK;
1283     } else {
1284         glGetIntegerv(GL_DRAW_BUFFER, &draw_buffer);
1285         glReadBuffer(draw_buffer);
1286     }
1287
1288     if (draw_buffer != GL_NONE) {
1289         GLint read_buffer = GL_NONE;
1290         if (!context.ES) {
1291             glGetIntegerv(GL_READ_BUFFER, &read_buffer);
1292         }
1293
1294         GLint alpha_bits = 0;
1295 #if 0
1296         // XXX: Ignore alpha until we are able to match the traced visual
1297         glGetIntegerv(GL_ALPHA_BITS, &alpha_bits);
1298 #endif
1299         GLenum format = alpha_bits ? GL_RGBA : GL_RGB;
1300         json.beginMember(enumToString(draw_buffer));
1301         dumpReadBufferImage(json, width, height, format);
1302         json.endMember();
1303
1304         if (!context.ES) {
1305             glReadBuffer(read_buffer);
1306         }
1307     }
1308
1309     if (!context.ES) {
1310         GLint depth_bits = 0;
1311         glGetIntegerv(GL_DEPTH_BITS, &depth_bits);
1312         if (depth_bits) {
1313             json.beginMember("GL_DEPTH_COMPONENT");
1314             dumpReadBufferImage(json, width, height, GL_DEPTH_COMPONENT);
1315             json.endMember();
1316         }
1317
1318         GLint stencil_bits = 0;
1319         glGetIntegerv(GL_STENCIL_BITS, &stencil_bits);
1320         if (stencil_bits) {
1321             json.beginMember("GL_STENCIL_INDEX");
1322             dumpReadBufferImage(json, width, height, GL_STENCIL_INDEX);
1323             json.endMember();
1324         }
1325     }
1326 }
1327
1328
1329 /**
1330  * Dump the specified framebuffer attachment.
1331  *
1332  * In the case of a color attachment, it assumes it is already bound for read.
1333  */
1334 static void
1335 dumpFramebufferAttachment(JSONWriter &json, GLenum target, GLenum attachment, GLenum format)
1336 {
1337     GLint width = 0, height = 0;
1338     if (!getFramebufferAttachmentSize(target, attachment, &width, &height)) {
1339         return;
1340     }
1341
1342     GLint internalFormat = getFramebufferAttachmentFormat(target, attachment);
1343
1344     json.beginMember(enumToString(attachment));
1345     dumpReadBufferImage(json, width, height, format, internalFormat);
1346     json.endMember();
1347 }
1348
1349
1350 static void
1351 dumpFramebufferAttachments(JSONWriter &json, Context &context, GLenum target)
1352 {
1353     GLint read_framebuffer = 0;
1354     glGetIntegerv(GL_READ_FRAMEBUFFER_BINDING, &read_framebuffer);
1355
1356     GLint read_buffer = GL_NONE;
1357     glGetIntegerv(GL_READ_BUFFER, &read_buffer);
1358
1359     GLint max_draw_buffers = 1;
1360     glGetIntegerv(GL_MAX_DRAW_BUFFERS, &max_draw_buffers);
1361     GLint max_color_attachments = 0;
1362     glGetIntegerv(GL_MAX_COLOR_ATTACHMENTS, &max_color_attachments);
1363
1364     for (GLint i = 0; i < max_draw_buffers; ++i) {
1365         GLint draw_buffer = GL_NONE;
1366         glGetIntegerv(GL_DRAW_BUFFER0 + i, &draw_buffer);
1367         if (draw_buffer != GL_NONE) {
1368             glReadBuffer(draw_buffer);
1369             GLint attachment;
1370             if (draw_buffer >= GL_COLOR_ATTACHMENT0 && draw_buffer < GL_COLOR_ATTACHMENT0 + max_color_attachments) {
1371                 attachment = draw_buffer;
1372             } else {
1373                 std::cerr << "warning: unexpected GL_DRAW_BUFFER" << i << " = " << draw_buffer << "\n";
1374                 attachment = GL_COLOR_ATTACHMENT0;
1375             }
1376             GLint alpha_size = 0;
1377             glGetFramebufferAttachmentParameteriv(target, attachment,
1378                                                   GL_FRAMEBUFFER_ATTACHMENT_ALPHA_SIZE,
1379                                                   &alpha_size);
1380             GLenum format = alpha_size ? GL_RGBA : GL_RGB;
1381             dumpFramebufferAttachment(json, target, attachment, format);
1382         }
1383     }
1384
1385     glReadBuffer(read_buffer);
1386
1387     if (!context.ES) {
1388         dumpFramebufferAttachment(json, target, GL_DEPTH_ATTACHMENT, GL_DEPTH_COMPONENT);
1389         dumpFramebufferAttachment(json, target, GL_STENCIL_ATTACHMENT, GL_STENCIL_INDEX);
1390     }
1391
1392     glBindFramebuffer(GL_READ_FRAMEBUFFER, read_framebuffer);
1393 }
1394
1395
1396 static void
1397 dumpFramebuffer(JSONWriter &json, Context &context)
1398 {
1399     json.beginMember("framebuffer");
1400     json.beginObject();
1401
1402     GLint boundDrawFbo = 0, boundReadFbo = 0;
1403     glGetIntegerv(GL_DRAW_FRAMEBUFFER_BINDING, &boundDrawFbo);
1404     glGetIntegerv(GL_READ_FRAMEBUFFER_BINDING, &boundReadFbo);
1405     if (!boundDrawFbo) {
1406         dumpDrawableImages(json, context);
1407     } else if (context.ES) {
1408         dumpFramebufferAttachments(json, context, GL_FRAMEBUFFER);
1409     } else {
1410         GLint colorRb = 0, stencilRb = 0, depthRb = 0;
1411         GLint draw_buffer0 = GL_NONE;
1412         glGetIntegerv(GL_DRAW_BUFFER0, &draw_buffer0);
1413         bool multisample = false;
1414
1415         GLint boundRb = 0;
1416         glGetIntegerv(GL_RENDERBUFFER_BINDING, &boundRb);
1417
1418         GLint object_type;
1419         glGetFramebufferAttachmentParameteriv(GL_DRAW_FRAMEBUFFER, draw_buffer0, GL_FRAMEBUFFER_ATTACHMENT_OBJECT_TYPE, &object_type);
1420         if (object_type == GL_RENDERBUFFER) {
1421             glGetFramebufferAttachmentParameteriv(GL_DRAW_FRAMEBUFFER, draw_buffer0, GL_FRAMEBUFFER_ATTACHMENT_OBJECT_NAME, &colorRb);
1422             glBindRenderbuffer(GL_RENDERBUFFER, colorRb);
1423             GLint samples = 0;
1424             glGetRenderbufferParameteriv(GL_RENDERBUFFER, GL_RENDERBUFFER_SAMPLES, &samples);
1425             if (samples) {
1426                 multisample = true;
1427             }
1428         }
1429
1430         glGetFramebufferAttachmentParameteriv(GL_DRAW_FRAMEBUFFER, GL_DEPTH_ATTACHMENT, GL_FRAMEBUFFER_ATTACHMENT_OBJECT_TYPE, &object_type);
1431         if (object_type == GL_RENDERBUFFER) {
1432             glGetFramebufferAttachmentParameteriv(GL_DRAW_FRAMEBUFFER, GL_DEPTH_ATTACHMENT, GL_FRAMEBUFFER_ATTACHMENT_OBJECT_NAME, &depthRb);
1433             glBindRenderbuffer(GL_RENDERBUFFER, depthRb);
1434             GLint samples = 0;
1435             glGetRenderbufferParameteriv(GL_RENDERBUFFER, GL_RENDERBUFFER_SAMPLES, &samples);
1436             if (samples) {
1437                 multisample = true;
1438             }
1439         }
1440
1441         glGetFramebufferAttachmentParameteriv(GL_DRAW_FRAMEBUFFER, GL_STENCIL_ATTACHMENT, GL_FRAMEBUFFER_ATTACHMENT_OBJECT_TYPE, &object_type);
1442         if (object_type == GL_RENDERBUFFER) {
1443             glGetFramebufferAttachmentParameteriv(GL_DRAW_FRAMEBUFFER, GL_STENCIL_ATTACHMENT, GL_FRAMEBUFFER_ATTACHMENT_OBJECT_NAME, &stencilRb);
1444             glBindRenderbuffer(GL_RENDERBUFFER, stencilRb);
1445             GLint samples = 0;
1446             glGetRenderbufferParameteriv(GL_RENDERBUFFER, GL_RENDERBUFFER_SAMPLES, &samples);
1447             if (samples) {
1448                 multisample = true;
1449             }
1450         }
1451
1452         glBindRenderbuffer(GL_RENDERBUFFER, boundRb);
1453
1454         GLuint rbs[3];
1455         GLint numRbs = 0;
1456         GLuint fboCopy = 0;
1457
1458         if (multisample) {
1459             // glReadPixels doesnt support multisampled buffers so we need
1460             // to blit the fbo to a temporary one
1461             fboCopy = downsampledFramebuffer(boundDrawFbo, draw_buffer0,
1462                                              colorRb, depthRb, stencilRb,
1463                                              rbs, &numRbs);
1464         }
1465
1466         dumpFramebufferAttachments(json, context, GL_DRAW_FRAMEBUFFER);
1467
1468         if (multisample) {
1469             glBindRenderbuffer(GL_RENDERBUFFER_BINDING, boundRb);
1470             glDeleteRenderbuffers(numRbs, rbs);
1471             glDeleteFramebuffers(1, &fboCopy);
1472         }
1473
1474         glBindFramebuffer(GL_READ_FRAMEBUFFER, boundReadFbo);
1475         glBindFramebuffer(GL_DRAW_FRAMEBUFFER, boundDrawFbo);
1476     }
1477
1478     json.endObject();
1479     json.endMember(); // framebuffer
1480 }
1481
1482
1483 static const GLenum bindings[] = {
1484     GL_DRAW_BUFFER,
1485     GL_READ_BUFFER,
1486     GL_PIXEL_PACK_BUFFER_BINDING,
1487     GL_PIXEL_UNPACK_BUFFER_BINDING,
1488     GL_TEXTURE_BINDING_1D,
1489     GL_TEXTURE_BINDING_2D,
1490     GL_TEXTURE_BINDING_3D,
1491     GL_TEXTURE_BINDING_RECTANGLE,
1492     GL_TEXTURE_BINDING_CUBE_MAP,
1493     GL_DRAW_FRAMEBUFFER_BINDING,
1494     GL_READ_FRAMEBUFFER_BINDING,
1495     GL_RENDERBUFFER_BINDING,
1496     GL_DRAW_BUFFER0,
1497     GL_DRAW_BUFFER1,
1498     GL_DRAW_BUFFER2,
1499     GL_DRAW_BUFFER3,
1500     GL_DRAW_BUFFER4,
1501     GL_DRAW_BUFFER5,
1502     GL_DRAW_BUFFER6,
1503     GL_DRAW_BUFFER7,
1504 };
1505
1506
1507 #define NUM_BINDINGS sizeof(bindings)/sizeof(bindings[0])
1508
1509
1510 void dumpCurrentContext(std::ostream &os)
1511 {
1512     JSONWriter json(os);
1513
1514 #ifndef NDEBUG
1515     GLint old_bindings[NUM_BINDINGS];
1516     for (unsigned i = 0; i < NUM_BINDINGS; ++i) {
1517         old_bindings[i] = 0;
1518         glGetIntegerv(bindings[i], &old_bindings[i]);
1519     }
1520 #endif
1521
1522     Context context;
1523
1524     dumpParameters(json, context);
1525     dumpShadersUniforms(json);
1526     dumpTextures(json, context);
1527     dumpFramebuffer(json, context);
1528
1529 #ifndef NDEBUG
1530     for (unsigned i = 0; i < NUM_BINDINGS; ++i) {
1531         GLint new_binding = 0;
1532         glGetIntegerv(bindings[i], &new_binding);
1533         if (new_binding != old_bindings[i]) {
1534             std::cerr << "warning: " << enumToString(bindings[i]) << " was clobbered\n";
1535         }
1536     }
1537 #endif
1538
1539 }
1540
1541
1542 } /* namespace glstate */