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 #include <iostream>
  29 #include <algorithm>
  30
  31 #include "image.hpp"
  32 #include "json.hpp"
  33 #include "glproc.hpp"
  34 #include "glsize.hpp"
  35 #include "glstate.hpp"
  36
  37
  38 #ifdef __APPLE__
  39
  40 #include <Carbon/Carbon.h>
  41
  42 #ifdef __cplusplus
  43 extern "C" {
  44 #endif
  45
  46 OSStatus CGSGetSurfaceBounds(CGSConnectionID, CGWindowID, CGSSurfaceID, CGRect *);
  47
  48 #ifdef __cplusplus
  49 }
  50 #endif
  51
  52 #endif /* __APPLE__ */
  53
  54
  55 namespace glstate {
  56
  57
  58 static void
  59 dumpShader(JSONWriter &json, GLuint shader)
  60 {
  61     if (!shader) {
  62         return;
  63     }
  64
  65     GLint shader_type = 0;
  66     glGetShaderiv(shader, GL_SHADER_TYPE, &shader_type);
  67     if (!shader_type) {
  68         return;
  69     }
  70
  71     GLint source_length = 0;
  72     glGetShaderiv(shader, GL_SHADER_SOURCE_LENGTH, &source_length);
  73     if (!source_length) {
  74         return;
  75     }
  76
  77     GLchar *source = new GLchar[source_length];
  78     GLsizei length = 0;
  79     source[0] = 0;
  80     glGetShaderSource(shader, source_length, &length, source);
  81
  82     json.beginMember(enumToString(shader_type));
  83     json.writeString(source);
  84     json.endMember();
  85
  86     delete [] source;
  87 }
  88
  89
  90 static void
  91 dumpShaderObj(JSONWriter &json, GLhandleARB shaderObj)
  92 {
  93     if (!shaderObj) {
  94         return;
  95     }
  96
  97     GLint shader_type = 0;
  98     glGetObjectParameterivARB(shaderObj, GL_OBJECT_TYPE_ARB, &shader_type);
  99     if (!shader_type) {
 100         return;
 101     }
 102
 103     GLint source_length = 0;
 104     glGetObjectParameterivARB(shaderObj, GL_OBJECT_SHADER_SOURCE_LENGTH_ARB, &source_length);
 105     if (!source_length) {
 106         return;
 107     }
 108
 109     GLcharARB *source = new GLcharARB[source_length];
 110     GLsizei length = 0;
 111     source[0] = 0;
 112     glGetShaderSource(shaderObj, source_length, &length, source);
 113
 114     json.beginMember(enumToString(shader_type));
 115     json.writeString(source);
 116     json.endMember();
 117
 118     delete [] source;
 119 }
 120
 121
 122 static inline void
 123 dumpCurrentProgram(JSONWriter &json)
 124 {
 125     GLint program = 0;
 126     glGetIntegerv(GL_CURRENT_PROGRAM, &program);
 127     if (!program) {
 128         return;
 129     }
 130
 131     GLint attached_shaders = 0;
 132     glGetProgramiv(program, GL_ATTACHED_SHADERS, &attached_shaders);
 133     if (!attached_shaders) {
 134         return;
 135     }
 136
 137     GLuint *shaders = new GLuint[attached_shaders];
 138     GLsizei count = 0;
 139     glGetAttachedShaders(program, attached_shaders, &count, shaders);
 140     for (GLsizei i = 0; i < count; ++ i) {
 141        dumpShader(json, shaders[i]);
 142     }
 143     delete [] shaders;
 144 }
 145
 146
 147 static inline void
 148 dumpCurrentProgramObj(JSONWriter &json)
 149 {
 150     GLhandleARB programObj = glGetHandleARB(GL_PROGRAM_OBJECT_ARB);
 151     if (!programObj) {
 152         return;
 153     }
 154
 155     GLint attached_shaders = 0;
 156     glGetProgramivARB(programObj, GL_OBJECT_ATTACHED_OBJECTS_ARB, &attached_shaders);
 157     if (!attached_shaders) {
 158         return;
 159     }
 160
 161     GLhandleARB *shaderObjs = new GLhandleARB[attached_shaders];
 162     GLsizei count = 0;
 163     glGetAttachedObjectsARB(programObj, attached_shaders, &count, shaderObjs);
 164     for (GLsizei i = 0; i < count; ++ i) {
 165        dumpShaderObj(json, shaderObjs[i]);
 166     }
 167     delete [] shaderObjs;
 168 }
 169
 170
 171 static inline void
 172 dumpArbProgram(JSONWriter &json, GLenum target)
 173 {
 174     if (!glIsEnabled(target)) {
 175         return;
 176     }
 177
 178     GLint program_length = 0;
 179     glGetProgramivARB(target, GL_PROGRAM_LENGTH_ARB, &program_length);
 180     if (!program_length) {
 181         return;
 182     }
 183
 184     GLchar *source = new GLchar[program_length + 1];
 185     source[0] = 0;
 186     glGetProgramStringARB(target, GL_PROGRAM_STRING_ARB, source);
 187     source[program_length] = 0;
 188
 189     json.beginMember(enumToString(target));
 190     json.writeString(source);
 191     json.endMember();
 192
 193     delete [] source;
 194 }
 195
 196
 197 static inline void
 198 dumpShaders(JSONWriter &json)
 199 {
 200     json.beginMember("shaders");
 201     json.beginObject();
 202     dumpCurrentProgram(json);
 203     dumpArbProgram(json, GL_FRAGMENT_PROGRAM_ARB);
 204     dumpArbProgram(json, GL_VERTEX_PROGRAM_ARB);
 205     json.endObject();
 206     json.endMember(); //shaders
 207 }
 208
 209
 210 static inline void
 211 dumpTextureImage(JSONWriter &json, GLenum target, GLint level)
 212 {
 213     GLint width, height = 1, depth = 1;
 214
 215     width = 0;
 216     glGetTexLevelParameteriv(target, level, GL_TEXTURE_WIDTH, &width);
 217
 218     if (target != GL_TEXTURE_1D) {
 219         height = 0;
 220         glGetTexLevelParameteriv(target, level, GL_TEXTURE_HEIGHT, &height);
 221         if (target == GL_TEXTURE_3D) {
 222             depth = 0;
 223             glGetTexLevelParameteriv(target, level, GL_TEXTURE_DEPTH, &depth);
 224         }
 225     }
 226
 227     if (width <= 0 || height <= 0 || depth <= 0) {
 228         return;
 229     } else {
 230         char label[512];
 231
 232         GLint active_texture = GL_TEXTURE0;
 233         glGetIntegerv(GL_ACTIVE_TEXTURE, &active_texture);
 234         snprintf(label, sizeof label, "%s, %s, level = %i", enumToString(active_texture), enumToString(target), level);
 235
 236         json.beginMember(label);
 237
 238         json.beginObject();
 239
 240         // Tell the GUI this is no ordinary object, but an image
 241         json.writeStringMember("__class__", "image");
 242
 243         json.writeNumberMember("__width__", width);
 244         json.writeNumberMember("__height__", height);
 245         json.writeNumberMember("__depth__", depth);
 246
 247         // Hardcoded for now, but we could chose types more adequate to the
 248         // texture internal format
 249         json.writeStringMember("__type__", "uint8");
 250         json.writeBoolMember("__normalized__", true);
 251         json.writeNumberMember("__channels__", 4);
 252
 253         GLubyte *pixels = new GLubyte[depth*width*height*4];
 254
 255         glGetTexImage(target, level, GL_RGBA, GL_UNSIGNED_BYTE, pixels);
 256
 257         json.beginMember("__data__");
 258         char *pngBuffer;
 259         int pngBufferSize;
 260         Image::writePixelsToBuffer(pixels, width, height, 4, false, &pngBuffer, &pngBufferSize);
 261         json.writeBase64(pngBuffer, pngBufferSize);
 262         free(pngBuffer);
 263         json.endMember(); // __data__
 264
 265         delete [] pixels;
 266         json.endObject();
 267     }
 268 }
 269
 270
 271 static inline void
 272 dumpTexture(JSONWriter &json, GLenum target, GLenum binding)
 273 {
 274     GLint texture_binding = 0;
 275     glGetIntegerv(binding, &texture_binding);
 276     if (!glIsEnabled(target) && !texture_binding) {
 277         return;
 278     }
 279
 280     GLint level = 0;
 281     do {
 282         GLint width = 0, height = 0;
 283         glGetTexLevelParameteriv(target, level, GL_TEXTURE_WIDTH, &width);
 284         glGetTexLevelParameteriv(target, level, GL_TEXTURE_HEIGHT, &height);
 285         if (!width || !height) {
 286             break;
 287         }
 288
 289         if (target == GL_TEXTURE_CUBE_MAP) {
 290             for (int face = 0; face < 6; ++face) {
 291                 dumpTextureImage(json, GL_TEXTURE_CUBE_MAP_POSITIVE_X + face, level);
 292             }
 293         } else {
 294             dumpTextureImage(json, target, level);
 295         }
 296
 297         ++level;
 298     } while(true);
 299 }
 300
 301
 302 static inline void
 303 dumpTextures(JSONWriter &json)
 304 {
 305     json.beginMember("textures");
 306     json.beginObject();
 307     GLint active_texture = GL_TEXTURE0;
 308     glGetIntegerv(GL_ACTIVE_TEXTURE, &active_texture);
 309     GLint max_texture_coords = 0;
 310     glGetIntegerv(GL_MAX_TEXTURE_COORDS, &max_texture_coords);
 311     GLint max_combined_texture_image_units = 0;
 312     glGetIntegerv(GL_MAX_COMBINED_TEXTURE_IMAGE_UNITS, &max_combined_texture_image_units);
 313     GLint max_units = std::max(max_combined_texture_image_units, max_texture_coords);
 314     for (GLint unit = 0; unit < max_units; ++unit) {
 315         GLenum texture = GL_TEXTURE0 + unit;
 316         glActiveTexture(texture);
 317         dumpTexture(json, GL_TEXTURE_1D, GL_TEXTURE_BINDING_1D);
 318         dumpTexture(json, GL_TEXTURE_2D, GL_TEXTURE_BINDING_2D);
 319         dumpTexture(json, GL_TEXTURE_3D, GL_TEXTURE_BINDING_3D);
 320         dumpTexture(json, GL_TEXTURE_RECTANGLE, GL_TEXTURE_BINDING_RECTANGLE);
 321         dumpTexture(json, GL_TEXTURE_CUBE_MAP, GL_TEXTURE_BINDING_CUBE_MAP);
 322     }
 323     glActiveTexture(active_texture);
 324     json.endObject();
 325     json.endMember(); // textures
 326 }
 327
 328
 329 static bool
 330 getDrawableBounds(GLint *width, GLint *height) {
 331 #if defined(_WIN32)
 332
 333     HDC hDC = wglGetCurrentDC();
 334     if (!hDC) {
 335         return false;
 336     }
 337
 338     HWND hWnd = WindowFromDC(hDC);
 339     RECT rect;
 340
 341     if (!GetClientRect(hWnd, &rect)) {
 342        return false;
 343     }
 344
 345     *width  = rect.right  - rect.left;
 346     *height = rect.bottom - rect.top;
 347
 348 #elif defined(__APPLE__)
 349
 350     CGLContextObj ctx = CGLGetCurrentContext();
 351     if (ctx == NULL) {
 352         return false;
 353     }
 354
 355     CGSConnectionID cid;
 356     CGSWindowID wid;
 357     CGSSurfaceID sid;
 358
 359     if (CGLGetSurface(ctx, &cid, &wid, &sid) != kCGLNoError) {
 360         return false;
 361     }
 362
 363     CGRect rect;
 364
 365     if (CGSGetSurfaceBounds(cid, wid, sid, &rect) != 0) {
 366         return false;
 367     }
 368
 369     *width = rect.size.width;
 370     *height = rect.size.height;
 371
 372 #else
 373
 374     Display *display;
 375     Drawable drawable;
 376     Window root;
 377     int x, y;
 378     unsigned int w, h, bw, depth;
 379
 380     display = glXGetCurrentDisplay();
 381     if (!display) {
 382         return false;
 383     }
 384
 385     drawable = glXGetCurrentDrawable();
 386     if (drawable == None) {
 387         return false;
 388     }
 389
 390     if (!XGetGeometry(display, drawable, &root, &x, &y, &w, &h, &bw, &depth)) {
 391         return false;
 392     }
 393
 394     *width = w;
 395     *height = h;
 396
 397 #endif
 398
 399     return true;
 400 }
 401
 402
 403 Image::Image *
 404 getDrawBufferImage(GLenum format) {
 405     GLint channels = __gl_format_channels(format);
 406     if (channels > 4) {
 407         return NULL;
 408     }
 409
 410     GLint width, height;
 411     if (!getDrawableBounds(&width, &height)) {
 412         return NULL;
 413     }
 414
 415     Image::Image *image = new Image::Image(width, height, channels, true);
 416     if (!image) {
 417         return NULL;
 418     }
 419
 420     GLint drawbuffer = GL_NONE;
 421     GLint readbuffer = GL_NONE;
 422     glGetIntegerv(GL_DRAW_BUFFER, &drawbuffer);
 423     glGetIntegerv(GL_READ_BUFFER, &readbuffer);
 424     glReadBuffer(drawbuffer);
 425
 426     glPushClientAttrib(GL_CLIENT_PIXEL_STORE_BIT);
 427     glPixelStorei(GL_PACK_SWAP_BYTES, GL_FALSE);
 428     glPixelStorei(GL_PACK_LSB_FIRST, GL_FALSE);
 429     glPixelStorei(GL_PACK_ROW_LENGTH, 0);
 430     glPixelStorei(GL_PACK_IMAGE_HEIGHT, 0);
 431     glPixelStorei(GL_PACK_SKIP_ROWS, 0);
 432     glPixelStorei(GL_PACK_SKIP_PIXELS, 0);
 433     glPixelStorei(GL_PACK_SKIP_IMAGES, 0);
 434     glPixelStorei(GL_PACK_ALIGNMENT, 1);
 435
 436     glReadPixels(0, 0, width, height, format, GL_UNSIGNED_BYTE, image->pixels);
 437
 438     glPopClientAttrib();
 439
 440     glReadBuffer(readbuffer);
 441
 442     return image;
 443 }
 444
 445
 446 static inline void
 447 dumpDrawBufferImage(JSONWriter &json, GLenum format)
 448 {
 449     GLint channels = __gl_format_channels(format);
 450
 451     GLint width, height;
 452
 453     if (!getDrawableBounds(&width, &height)) {
 454         json.writeNull();
 455     } else {
 456         json.beginObject();
 457
 458         // Tell the GUI this is no ordinary object, but an image
 459         json.writeStringMember("__class__", "image");
 460
 461         json.writeNumberMember("__width__", width);
 462         json.writeNumberMember("__height__", height);
 463         json.writeNumberMember("__depth__", 1);
 464
 465         // Hardcoded for now, but we could chose types more adequate to the
 466         // texture internal format
 467         json.writeStringMember("__type__", "uint8");
 468         json.writeBoolMember("__normalized__", true);
 469         json.writeNumberMember("__channels__", channels);
 470
 471         GLubyte *pixels = new GLubyte[width*height*channels];
 472
 473         GLint drawbuffer = GL_NONE;
 474         GLint readbuffer = GL_NONE;
 475         glGetIntegerv(GL_DRAW_BUFFER, &drawbuffer);
 476         glGetIntegerv(GL_READ_BUFFER, &readbuffer);
 477         glReadBuffer(drawbuffer);
 478
 479         glPushClientAttrib(GL_CLIENT_PIXEL_STORE_BIT);
 480         glPixelStorei(GL_PACK_SWAP_BYTES, GL_FALSE);
 481         glPixelStorei(GL_PACK_LSB_FIRST, GL_FALSE);
 482         glPixelStorei(GL_PACK_ROW_LENGTH, 0);
 483         glPixelStorei(GL_PACK_IMAGE_HEIGHT, 0);
 484         glPixelStorei(GL_PACK_SKIP_ROWS, 0);
 485         glPixelStorei(GL_PACK_SKIP_PIXELS, 0);
 486         glPixelStorei(GL_PACK_SKIP_IMAGES, 0);
 487         glPixelStorei(GL_PACK_ALIGNMENT, 1);
 488
 489         glReadPixels(0, 0, width, height, format, GL_UNSIGNED_BYTE, pixels);
 490
 491         glPopClientAttrib();
 492         glReadBuffer(readbuffer);
 493
 494         json.beginMember("__data__");
 495         char *pngBuffer;
 496         int pngBufferSize;
 497         Image::writePixelsToBuffer(pixels, width, height, channels, false, &pngBuffer, &pngBufferSize);
 498         //std::cerr <<" Before = "<<(width * height * channels * sizeof *pixels)
 499         //          <<", after = "<<pngBufferSize << ", ratio = " << double(width * height * channels * sizeof *pixels)/pngBufferSize;
 500         json.writeBase64(pngBuffer, pngBufferSize);
 501         free(pngBuffer);
 502         json.endMember(); // __data__
 503
 504         delete [] pixels;
 505         json.endObject();
 506     }
 507 }
 508
 509
 510 static inline GLuint
 511 downsampledFramebuffer(GLuint oldFbo, GLint drawbuffer,
 512                        GLint colorRb, GLint depthRb, GLint stencilRb,
 513                        GLuint *rbs, GLint *numRbs)
 514 {
 515     GLuint fbo;
 516     GLint format;
 517     GLint w, h;
 518
 519     *numRbs = 0;
 520
 521     glGenFramebuffers(1, &fbo);
 522     glBindFramebuffer(GL_FRAMEBUFFER, fbo);
 523
 524     glBindRenderbuffer(GL_RENDERBUFFER, colorRb);
 525     glGetRenderbufferParameteriv(GL_RENDERBUFFER,
 526                                  GL_RENDERBUFFER_WIDTH, &w);
 527     glGetRenderbufferParameteriv(GL_RENDERBUFFER,
 528                                  GL_RENDERBUFFER_HEIGHT, &h);
 529     glGetRenderbufferParameteriv(GL_RENDERBUFFER,
 530                                  GL_RENDERBUFFER_INTERNAL_FORMAT, &format);
 531
 532     glGenRenderbuffers(1, &rbs[*numRbs]);
 533     glBindRenderbuffer(GL_RENDERBUFFER, rbs[*numRbs]);
 534     glRenderbufferStorage(GL_RENDERBUFFER, format, w, h);
 535     glFramebufferRenderbuffer(GL_FRAMEBUFFER, drawbuffer,
 536                               GL_RENDERBUFFER, rbs[*numRbs]);
 537
 538     glBindFramebuffer(GL_READ_FRAMEBUFFER, oldFbo);
 539     glBindFramebuffer(GL_DRAW_FRAMEBUFFER, fbo);
 540     glDrawBuffer(drawbuffer);
 541     glReadBuffer(drawbuffer);
 542     glBlitFramebuffer(0, 0, w, h, 0, 0, w, h,
 543                       GL_COLOR_BUFFER_BIT, GL_NEAREST);
 544     glBindFramebuffer(GL_FRAMEBUFFER, fbo);
 545     ++*numRbs;
 546
 547     if (stencilRb == depthRb && stencilRb) {
 548         //combined depth and stencil buffer
 549         glBindRenderbuffer(GL_RENDERBUFFER, depthRb);
 550         glGetRenderbufferParameteriv(GL_RENDERBUFFER,
 551                                      GL_RENDERBUFFER_WIDTH, &w);
 552         glGetRenderbufferParameteriv(GL_RENDERBUFFER,
 553                                      GL_RENDERBUFFER_HEIGHT, &h);
 554         glGetRenderbufferParameteriv(GL_RENDERBUFFER,
 555                                      GL_RENDERBUFFER_INTERNAL_FORMAT, &format);
 556
 557         glGenRenderbuffers(1, &rbs[*numRbs]);
 558         glBindRenderbuffer(GL_RENDERBUFFER, rbs[*numRbs]);
 559         glRenderbufferStorage(GL_RENDERBUFFER, format, w, h);
 560         glFramebufferRenderbuffer(GL_FRAMEBUFFER, GL_DEPTH_STENCIL_ATTACHMENT,
 561                                   GL_RENDERBUFFER, rbs[*numRbs]);
 562         glBindFramebuffer(GL_READ_FRAMEBUFFER, oldFbo);
 563         glBindFramebuffer(GL_DRAW_FRAMEBUFFER, fbo);
 564         glBlitFramebuffer(0, 0, w, h, 0, 0, w, h,
 565                           GL_DEPTH_BUFFER_BIT | GL_STENCIL_BUFFER_BIT, GL_NEAREST);
 566         glBindFramebuffer(GL_FRAMEBUFFER, fbo);
 567         ++*numRbs;
 568     } else {
 569         if (depthRb) {
 570             glBindRenderbuffer(GL_RENDERBUFFER, depthRb);
 571             glGetRenderbufferParameteriv(GL_RENDERBUFFER,
 572                                          GL_RENDERBUFFER_WIDTH, &w);
 573             glGetRenderbufferParameteriv(GL_RENDERBUFFER,
 574                                          GL_RENDERBUFFER_HEIGHT, &h);
 575             glGetRenderbufferParameteriv(GL_RENDERBUFFER,
 576                                          GL_RENDERBUFFER_INTERNAL_FORMAT, &format);
 577
 578             glGenRenderbuffers(1, &rbs[*numRbs]);
 579             glBindRenderbuffer(GL_RENDERBUFFER, rbs[*numRbs]);
 580             glRenderbufferStorage(GL_RENDERBUFFER, format, w, h);
 581             glFramebufferRenderbuffer(GL_FRAMEBUFFER,
 582                                       GL_DEPTH_ATTACHMENT,
 583                                       GL_RENDERBUFFER, rbs[*numRbs]);
 584             glBindFramebuffer(GL_READ_FRAMEBUFFER, oldFbo);
 585             glBindFramebuffer(GL_DRAW_FRAMEBUFFER, fbo);
 586             glDrawBuffer(GL_DEPTH_ATTACHMENT);
 587             glReadBuffer(GL_DEPTH_ATTACHMENT);
 588             glBlitFramebuffer(0, 0, w, h, 0, 0, w, h,
 589                               GL_DEPTH_BUFFER_BIT, GL_NEAREST);
 590             ++*numRbs;
 591         }
 592         if (stencilRb) {
 593             glBindRenderbuffer(GL_RENDERBUFFER, stencilRb);
 594             glGetRenderbufferParameteriv(GL_RENDERBUFFER,
 595                                          GL_RENDERBUFFER_WIDTH, &w);
 596             glGetRenderbufferParameteriv(GL_RENDERBUFFER,
 597                                          GL_RENDERBUFFER_HEIGHT, &h);
 598             glGetRenderbufferParameteriv(GL_RENDERBUFFER,
 599                                      GL_RENDERBUFFER_INTERNAL_FORMAT, &format);
 600
 601             glGenRenderbuffers(1, &rbs[*numRbs]);
 602             glBindRenderbuffer(GL_RENDERBUFFER, rbs[*numRbs]);
 603             glRenderbufferStorage(GL_RENDERBUFFER, format, w, h);
 604             glFramebufferRenderbuffer(GL_FRAMEBUFFER,
 605                                       GL_STENCIL_ATTACHMENT,
 606                                       GL_RENDERBUFFER, rbs[*numRbs]);
 607             glBindFramebuffer(GL_READ_FRAMEBUFFER, oldFbo);
 608             glBindFramebuffer(GL_DRAW_FRAMEBUFFER, fbo);
 609             glDrawBuffer(GL_STENCIL_ATTACHMENT);
 610             glReadBuffer(GL_STENCIL_ATTACHMENT);
 611             glBlitFramebuffer(0, 0, w, h, 0, 0, w, h,
 612                               GL_STENCIL_BUFFER_BIT, GL_NEAREST);
 613             ++*numRbs;
 614         }
 615     }
 616
 617     return fbo;
 618 }
 619
 620
 621 static void
 622 dumpDrawBuffers(JSONWriter &json, GLboolean dumpDepth, GLboolean dumpStencil)
 623 {
 624     json.beginMember("GL_RGBA");
 625     dumpDrawBufferImage(json, GL_RGBA);
 626     json.endMember();
 627
 628     if (dumpDepth) {
 629         json.beginMember("GL_DEPTH_COMPONENT");
 630         dumpDrawBufferImage(json, GL_DEPTH_COMPONENT);
 631         json.endMember();
 632     }
 633
 634     if (dumpStencil) {
 635         json.beginMember("GL_STENCIL_INDEX");
 636         dumpDrawBufferImage(json, GL_STENCIL_INDEX);
 637         json.endMember();
 638     }
 639 }
 640
 641
 642 static void
 643 dumpFramebuffer(JSONWriter &json)
 644 {
 645     json.beginMember("framebuffer");
 646     json.beginObject();
 647
 648     GLint boundDrawFbo = 0, boundReadFbo = 0;
 649     glGetIntegerv(GL_DRAW_FRAMEBUFFER_BINDING, &boundDrawFbo);
 650     glGetIntegerv(GL_READ_FRAMEBUFFER_BINDING, &boundReadFbo);
 651     if (!boundDrawFbo) {
 652         GLint depth_bits = 0;
 653         glGetIntegerv(GL_DEPTH_BITS, &depth_bits);
 654         GLint stencil_bits = 0;
 655         glGetIntegerv(GL_STENCIL_BITS, &stencil_bits);
 656         dumpDrawBuffers(json, depth_bits, stencil_bits);
 657     } else {
 658         GLint colorRb, stencilRb, depthRb;
 659         GLint boundRb;
 660         glGetIntegerv(GL_RENDERBUFFER_BINDING, &boundRb);
 661         GLint drawbuffer = GL_NONE;
 662         glGetIntegerv(GL_DRAW_BUFFER, &drawbuffer);
 663
 664         glGetFramebufferAttachmentParameteriv(GL_FRAMEBUFFER,
 665                                               drawbuffer,
 666                                               GL_FRAMEBUFFER_ATTACHMENT_OBJECT_NAME,
 667                                               &colorRb);
 668         glGetFramebufferAttachmentParameteriv(GL_FRAMEBUFFER,
 669                                               GL_DEPTH_ATTACHMENT,
 670                                               GL_FRAMEBUFFER_ATTACHMENT_OBJECT_NAME,
 671                                               &depthRb);
 672         glGetFramebufferAttachmentParameteriv(GL_FRAMEBUFFER,
 673                                               GL_STENCIL_ATTACHMENT,
 674                                               GL_FRAMEBUFFER_ATTACHMENT_OBJECT_NAME,
 675                                               &stencilRb);
 676
 677         GLint colorSamples, depthSamples, stencilSamples;
 678         GLuint rbs[3];
 679         GLint numRbs = 0;
 680         GLuint fboCopy = 0;
 681         glBindRenderbuffer(GL_RENDERBUFFER, colorRb);
 682         glGetRenderbufferParameteriv(GL_RENDERBUFFER,
 683                                      GL_RENDERBUFFER_SAMPLES, &colorSamples);
 684         glBindRenderbuffer(GL_RENDERBUFFER, depthRb);
 685         glGetRenderbufferParameteriv(GL_RENDERBUFFER,
 686                                      GL_RENDERBUFFER_SAMPLES, &depthSamples);
 687         glBindRenderbuffer(GL_RENDERBUFFER, stencilRb);
 688         glGetRenderbufferParameteriv(GL_RENDERBUFFER,
 689                                      GL_RENDERBUFFER_SAMPLES, &stencilSamples);
 690         glBindRenderbuffer(GL_RENDERBUFFER, boundRb);
 691
 692         if (colorSamples || depthSamples || stencilSamples) {
 693             //glReadPixels doesnt support multisampled buffers so we need
 694             // to blit the fbo to a temporary one
 695             fboCopy = downsampledFramebuffer(boundDrawFbo, drawbuffer,
 696                                              colorRb, depthRb, stencilRb,
 697                                              rbs, &numRbs);
 698         }
 699         glDrawBuffer(drawbuffer);
 700         glReadBuffer(drawbuffer);
 701
 702         dumpDrawBuffers(json, depthRb, stencilRb);
 703
 704         if (fboCopy) {
 705             glBindFramebuffer(GL_FRAMEBUFFER, boundDrawFbo);
 706             glBindFramebuffer(GL_READ_FRAMEBUFFER, boundReadFbo);
 707             glBindFramebuffer(GL_DRAW_FRAMEBUFFER, boundDrawFbo);
 708             glBindRenderbuffer(GL_RENDERBUFFER_BINDING, boundRb);
 709             glDeleteRenderbuffers(numRbs, rbs);
 710             glDeleteFramebuffers(1, &fboCopy);
 711         }
 712     }
 713
 714     json.endObject();
 715     json.endMember(); // framebuffer
 716 }
 717
 718
 719 void dumpCurrentContext(std::ostream &os)
 720 {
 721     JSONWriter json(os);
 722     dumpParameters(json);
 723     dumpShaders(json);
 724     dumpTextures(json);
 725     dumpFramebuffer(json);
 726 }
 727
 728
 729 } /* namespace glstate */