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 inline void
  59 resetPixelPackState(void) {
  60     glPushClientAttrib(GL_CLIENT_PIXEL_STORE_BIT);
  61     glPixelStorei(GL_PACK_SWAP_BYTES, GL_FALSE);
  62     glPixelStorei(GL_PACK_LSB_FIRST, GL_FALSE);
  63     glPixelStorei(GL_PACK_ROW_LENGTH, 0);
  64     glPixelStorei(GL_PACK_IMAGE_HEIGHT, 0);
  65     glPixelStorei(GL_PACK_SKIP_ROWS, 0);
  66     glPixelStorei(GL_PACK_SKIP_PIXELS, 0);
  67     glPixelStorei(GL_PACK_SKIP_IMAGES, 0);
  68     glPixelStorei(GL_PACK_ALIGNMENT, 1);
  69     glBindBuffer(GL_PIXEL_PACK_BUFFER, 0);
  70 }
  71
  72
  73 static inline void
  74 restorePixelPackState(void) {
  75     glPopClientAttrib();
  76 }
  77
  78
  79 static void
  80 dumpShader(JSONWriter &json, GLuint shader)
  81 {
  82     if (!shader) {
  83         return;
  84     }
  85
  86     GLint shader_type = 0;
  87     glGetShaderiv(shader, GL_SHADER_TYPE, &shader_type);
  88     if (!shader_type) {
  89         return;
  90     }
  91
  92     GLint source_length = 0;
  93     glGetShaderiv(shader, GL_SHADER_SOURCE_LENGTH, &source_length);
  94     if (!source_length) {
  95         return;
  96     }
  97
  98     GLchar *source = new GLchar[source_length];
  99     GLsizei length = 0;
 100     source[0] = 0;
 101     glGetShaderSource(shader, source_length, &length, source);
 102
 103     json.beginMember(enumToString(shader_type));
 104     json.writeString(source);
 105     json.endMember();
 106
 107     delete [] source;
 108 }
 109
 110
 111 static void
 112 dumpShaderObj(JSONWriter &json, GLhandleARB shaderObj)
 113 {
 114     if (!shaderObj) {
 115         return;
 116     }
 117
 118     GLint shader_type = 0;
 119     glGetObjectParameterivARB(shaderObj, GL_OBJECT_TYPE_ARB, &shader_type);
 120     if (!shader_type) {
 121         return;
 122     }
 123
 124     GLint source_length = 0;
 125     glGetObjectParameterivARB(shaderObj, GL_OBJECT_SHADER_SOURCE_LENGTH_ARB, &source_length);
 126     if (!source_length) {
 127         return;
 128     }
 129
 130     GLcharARB *source = new GLcharARB[source_length];
 131     GLsizei length = 0;
 132     source[0] = 0;
 133     glGetShaderSource(shaderObj, source_length, &length, source);
 134
 135     json.beginMember(enumToString(shader_type));
 136     json.writeString(source);
 137     json.endMember();
 138
 139     delete [] source;
 140 }
 141
 142
 143 static inline void
 144 dumpCurrentProgram(JSONWriter &json)
 145 {
 146     GLint program = 0;
 147     glGetIntegerv(GL_CURRENT_PROGRAM, &program);
 148     if (!program) {
 149         return;
 150     }
 151
 152     GLint attached_shaders = 0;
 153     glGetProgramiv(program, GL_ATTACHED_SHADERS, &attached_shaders);
 154     if (!attached_shaders) {
 155         return;
 156     }
 157
 158     GLuint *shaders = new GLuint[attached_shaders];
 159     GLsizei count = 0;
 160     glGetAttachedShaders(program, attached_shaders, &count, shaders);
 161     for (GLsizei i = 0; i < count; ++ i) {
 162        dumpShader(json, shaders[i]);
 163     }
 164     delete [] shaders;
 165 }
 166
 167
 168 static inline void
 169 dumpCurrentProgramObj(JSONWriter &json)
 170 {
 171     GLhandleARB programObj = glGetHandleARB(GL_PROGRAM_OBJECT_ARB);
 172     if (!programObj) {
 173         return;
 174     }
 175
 176     GLint attached_shaders = 0;
 177     glGetProgramivARB(programObj, GL_OBJECT_ATTACHED_OBJECTS_ARB, &attached_shaders);
 178     if (!attached_shaders) {
 179         return;
 180     }
 181
 182     GLhandleARB *shaderObjs = new GLhandleARB[attached_shaders];
 183     GLsizei count = 0;
 184     glGetAttachedObjectsARB(programObj, attached_shaders, &count, shaderObjs);
 185     for (GLsizei i = 0; i < count; ++ i) {
 186        dumpShaderObj(json, shaderObjs[i]);
 187     }
 188     delete [] shaderObjs;
 189 }
 190
 191
 192 static inline void
 193 dumpArbProgram(JSONWriter &json, GLenum target)
 194 {
 195     if (!glIsEnabled(target)) {
 196         return;
 197     }
 198
 199     GLint program_length = 0;
 200     glGetProgramivARB(target, GL_PROGRAM_LENGTH_ARB, &program_length);
 201     if (!program_length) {
 202         return;
 203     }
 204
 205     GLchar *source = new GLchar[program_length + 1];
 206     source[0] = 0;
 207     glGetProgramStringARB(target, GL_PROGRAM_STRING_ARB, source);
 208     source[program_length] = 0;
 209
 210     json.beginMember(enumToString(target));
 211     json.writeString(source);
 212     json.endMember();
 213
 214     delete [] source;
 215 }
 216
 217
 218 static inline void
 219 dumpShaders(JSONWriter &json)
 220 {
 221     json.beginMember("shaders");
 222     json.beginObject();
 223     dumpCurrentProgram(json);
 224     dumpArbProgram(json, GL_FRAGMENT_PROGRAM_ARB);
 225     dumpArbProgram(json, GL_VERTEX_PROGRAM_ARB);
 226     json.endObject();
 227     json.endMember(); //shaders
 228 }
 229
 230
 231 static inline void
 232 dumpTextureImage(JSONWriter &json, GLenum target, GLint level)
 233 {
 234     GLint width, height = 1, depth = 1;
 235
 236     width = 0;
 237     glGetTexLevelParameteriv(target, level, GL_TEXTURE_WIDTH, &width);
 238
 239     if (target != GL_TEXTURE_1D) {
 240         height = 0;
 241         glGetTexLevelParameteriv(target, level, GL_TEXTURE_HEIGHT, &height);
 242         if (target == GL_TEXTURE_3D) {
 243             depth = 0;
 244             glGetTexLevelParameteriv(target, level, GL_TEXTURE_DEPTH, &depth);
 245         }
 246     }
 247
 248     if (width <= 0 || height <= 0 || depth <= 0) {
 249         return;
 250     } else {
 251         char label[512];
 252
 253         GLint active_texture = GL_TEXTURE0;
 254         glGetIntegerv(GL_ACTIVE_TEXTURE, &active_texture);
 255         snprintf(label, sizeof label, "%s, %s, level = %i", enumToString(active_texture), enumToString(target), level);
 256
 257         json.beginMember(label);
 258
 259         json.beginObject();
 260
 261         // Tell the GUI this is no ordinary object, but an image
 262         json.writeStringMember("__class__", "image");
 263
 264         json.writeNumberMember("__width__", width);
 265         json.writeNumberMember("__height__", height);
 266         json.writeNumberMember("__depth__", depth);
 267
 268         // Hardcoded for now, but we could chose types more adequate to the
 269         // texture internal format
 270         json.writeStringMember("__type__", "uint8");
 271         json.writeBoolMember("__normalized__", true);
 272         json.writeNumberMember("__channels__", 4);
 273
 274         GLubyte *pixels = new GLubyte[depth*width*height*4];
 275
 276         resetPixelPackState();
 277
 278         glGetTexImage(target, level, GL_RGBA, GL_UNSIGNED_BYTE, pixels);
 279
 280         restorePixelPackState();
 281
 282         json.beginMember("__data__");
 283         char *pngBuffer;
 284         int pngBufferSize;
 285         Image::writePixelsToBuffer(pixels, width, height, 4, false, &pngBuffer, &pngBufferSize);
 286         json.writeBase64(pngBuffer, pngBufferSize);
 287         free(pngBuffer);
 288         json.endMember(); // __data__
 289
 290         delete [] pixels;
 291         json.endObject();
 292     }
 293 }
 294
 295
 296 static inline void
 297 dumpTexture(JSONWriter &json, GLenum target, GLenum binding)
 298 {
 299     GLint texture_binding = 0;
 300     glGetIntegerv(binding, &texture_binding);
 301     if (!glIsEnabled(target) && !texture_binding) {
 302         return;
 303     }
 304
 305     GLint level = 0;
 306     do {
 307         GLint width = 0, height = 0;
 308         glGetTexLevelParameteriv(target, level, GL_TEXTURE_WIDTH, &width);
 309         glGetTexLevelParameteriv(target, level, GL_TEXTURE_HEIGHT, &height);
 310         if (!width || !height) {
 311             break;
 312         }
 313
 314         if (target == GL_TEXTURE_CUBE_MAP) {
 315             for (int face = 0; face < 6; ++face) {
 316                 dumpTextureImage(json, GL_TEXTURE_CUBE_MAP_POSITIVE_X + face, level);
 317             }
 318         } else {
 319             dumpTextureImage(json, target, level);
 320         }
 321
 322         ++level;
 323     } while(true);
 324 }
 325
 326
 327 static inline void
 328 dumpTextures(JSONWriter &json)
 329 {
 330     json.beginMember("textures");
 331     json.beginObject();
 332     GLint active_texture = GL_TEXTURE0;
 333     glGetIntegerv(GL_ACTIVE_TEXTURE, &active_texture);
 334     GLint max_texture_coords = 0;
 335     glGetIntegerv(GL_MAX_TEXTURE_COORDS, &max_texture_coords);
 336     GLint max_combined_texture_image_units = 0;
 337     glGetIntegerv(GL_MAX_COMBINED_TEXTURE_IMAGE_UNITS, &max_combined_texture_image_units);
 338     GLint max_units = std::max(max_combined_texture_image_units, max_texture_coords);
 339     for (GLint unit = 0; unit < max_units; ++unit) {
 340         GLenum texture = GL_TEXTURE0 + unit;
 341         glActiveTexture(texture);
 342         dumpTexture(json, GL_TEXTURE_1D, GL_TEXTURE_BINDING_1D);
 343         dumpTexture(json, GL_TEXTURE_2D, GL_TEXTURE_BINDING_2D);
 344         dumpTexture(json, GL_TEXTURE_3D, GL_TEXTURE_BINDING_3D);
 345         dumpTexture(json, GL_TEXTURE_RECTANGLE, GL_TEXTURE_BINDING_RECTANGLE);
 346         dumpTexture(json, GL_TEXTURE_CUBE_MAP, GL_TEXTURE_BINDING_CUBE_MAP);
 347     }
 348     glActiveTexture(active_texture);
 349     json.endObject();
 350     json.endMember(); // textures
 351 }
 352
 353
 354 static bool
 355 getDrawableBounds(GLint *width, GLint *height) {
 356 #if defined(_WIN32)
 357
 358     HDC hDC = wglGetCurrentDC();
 359     if (!hDC) {
 360         return false;
 361     }
 362
 363     HWND hWnd = WindowFromDC(hDC);
 364     RECT rect;
 365
 366     if (!GetClientRect(hWnd, &rect)) {
 367        return false;
 368     }
 369
 370     *width  = rect.right  - rect.left;
 371     *height = rect.bottom - rect.top;
 372
 373 #elif defined(__APPLE__)
 374
 375     CGLContextObj ctx = CGLGetCurrentContext();
 376     if (ctx == NULL) {
 377         return false;
 378     }
 379
 380     CGSConnectionID cid;
 381     CGSWindowID wid;
 382     CGSSurfaceID sid;
 383
 384     if (CGLGetSurface(ctx, &cid, &wid, &sid) != kCGLNoError) {
 385         return false;
 386     }
 387
 388     CGRect rect;
 389
 390     if (CGSGetSurfaceBounds(cid, wid, sid, &rect) != 0) {
 391         return false;
 392     }
 393
 394     *width = rect.size.width;
 395     *height = rect.size.height;
 396
 397 #else
 398
 399     Display *display;
 400     Drawable drawable;
 401     Window root;
 402     int x, y;
 403     unsigned int w, h, bw, depth;
 404
 405     display = glXGetCurrentDisplay();
 406     if (!display) {
 407         return false;
 408     }
 409
 410     drawable = glXGetCurrentDrawable();
 411     if (drawable == None) {
 412         return false;
 413     }
 414
 415     if (!XGetGeometry(display, drawable, &root, &x, &y, &w, &h, &bw, &depth)) {
 416         return false;
 417     }
 418
 419     *width = w;
 420     *height = h;
 421
 422 #endif
 423
 424     return true;
 425 }
 426
 427
 428 Image::Image *
 429 getDrawBufferImage(GLenum format) {
 430     GLint channels = __gl_format_channels(format);
 431     if (channels > 4) {
 432         return NULL;
 433     }
 434
 435     GLint width, height;
 436     if (!getDrawableBounds(&width, &height)) {
 437         return NULL;
 438     }
 439
 440     Image::Image *image = new Image::Image(width, height, channels, true);
 441     if (!image) {
 442         return NULL;
 443     }
 444
 445     GLint draw_buffer = GL_NONE;
 446     GLint read_buffer = GL_NONE;
 447     glGetIntegerv(GL_DRAW_BUFFER, &draw_buffer);
 448     glGetIntegerv(GL_READ_BUFFER, &read_buffer);
 449     glReadBuffer(draw_buffer);
 450
 451     resetPixelPackState();
 452
 453     glReadPixels(0, 0, width, height, format, GL_UNSIGNED_BYTE, image->pixels);
 454
 455     restorePixelPackState();
 456     glReadBuffer(read_buffer);
 457
 458     return image;
 459 }
 460
 461
 462 static inline void
 463 dumpDrawBufferImage(JSONWriter &json, GLenum format)
 464 {
 465     GLint channels = __gl_format_channels(format);
 466
 467     GLint width, height;
 468
 469     if (!getDrawableBounds(&width, &height)) {
 470         json.writeNull();
 471     } else {
 472         json.beginObject();
 473
 474         // Tell the GUI this is no ordinary object, but an image
 475         json.writeStringMember("__class__", "image");
 476
 477         json.writeNumberMember("__width__", width);
 478         json.writeNumberMember("__height__", height);
 479         json.writeNumberMember("__depth__", 1);
 480
 481         // Hardcoded for now, but we could chose types more adequate to the
 482         // texture internal format
 483         json.writeStringMember("__type__", "uint8");
 484         json.writeBoolMember("__normalized__", true);
 485         json.writeNumberMember("__channels__", channels);
 486
 487         GLubyte *pixels = new GLubyte[width*height*channels];
 488
 489         GLint draw_buffer = GL_NONE;
 490         GLint read_buffer = GL_NONE;
 491         glGetIntegerv(GL_DRAW_BUFFER, &draw_buffer);
 492         glGetIntegerv(GL_READ_BUFFER, &read_buffer);
 493         glReadBuffer(draw_buffer);
 494
 495         resetPixelPackState();
 496
 497         glReadPixels(0, 0, width, height, format, GL_UNSIGNED_BYTE, pixels);
 498
 499         restorePixelPackState();
 500         glReadBuffer(read_buffer);
 501
 502         json.beginMember("__data__");
 503         char *pngBuffer;
 504         int pngBufferSize;
 505         Image::writePixelsToBuffer(pixels, width, height, channels, false, &pngBuffer, &pngBufferSize);
 506         //std::cerr <<" Before = "<<(width * height * channels * sizeof *pixels)
 507         //          <<", after = "<<pngBufferSize << ", ratio = " << double(width * height * channels * sizeof *pixels)/pngBufferSize;
 508         json.writeBase64(pngBuffer, pngBufferSize);
 509         free(pngBuffer);
 510         json.endMember(); // __data__
 511
 512         delete [] pixels;
 513         json.endObject();
 514     }
 515 }
 516
 517
 518 static inline GLuint
 519 downsampledFramebuffer(GLuint oldFbo, GLint drawbuffer,
 520                        GLint colorRb, GLint depthRb, GLint stencilRb,
 521                        GLuint *rbs, GLint *numRbs)
 522 {
 523     GLuint fbo;
 524     GLint format;
 525     GLint w, h;
 526
 527     *numRbs = 0;
 528
 529     glGenFramebuffers(1, &fbo);
 530     glBindFramebuffer(GL_FRAMEBUFFER, fbo);
 531
 532     glBindRenderbuffer(GL_RENDERBUFFER, colorRb);
 533     glGetRenderbufferParameteriv(GL_RENDERBUFFER,
 534                                  GL_RENDERBUFFER_WIDTH, &w);
 535     glGetRenderbufferParameteriv(GL_RENDERBUFFER,
 536                                  GL_RENDERBUFFER_HEIGHT, &h);
 537     glGetRenderbufferParameteriv(GL_RENDERBUFFER,
 538                                  GL_RENDERBUFFER_INTERNAL_FORMAT, &format);
 539
 540     glGenRenderbuffers(1, &rbs[*numRbs]);
 541     glBindRenderbuffer(GL_RENDERBUFFER, rbs[*numRbs]);
 542     glRenderbufferStorage(GL_RENDERBUFFER, format, w, h);
 543     glFramebufferRenderbuffer(GL_FRAMEBUFFER, drawbuffer,
 544                               GL_RENDERBUFFER, rbs[*numRbs]);
 545
 546     glBindFramebuffer(GL_READ_FRAMEBUFFER, oldFbo);
 547     glBindFramebuffer(GL_DRAW_FRAMEBUFFER, fbo);
 548     glDrawBuffer(drawbuffer);
 549     glReadBuffer(drawbuffer);
 550     glBlitFramebuffer(0, 0, w, h, 0, 0, w, h,
 551                       GL_COLOR_BUFFER_BIT, GL_NEAREST);
 552     glBindFramebuffer(GL_FRAMEBUFFER, fbo);
 553     ++*numRbs;
 554
 555     if (stencilRb == depthRb && stencilRb) {
 556         //combined depth and stencil buffer
 557         glBindRenderbuffer(GL_RENDERBUFFER, depthRb);
 558         glGetRenderbufferParameteriv(GL_RENDERBUFFER,
 559                                      GL_RENDERBUFFER_WIDTH, &w);
 560         glGetRenderbufferParameteriv(GL_RENDERBUFFER,
 561                                      GL_RENDERBUFFER_HEIGHT, &h);
 562         glGetRenderbufferParameteriv(GL_RENDERBUFFER,
 563                                      GL_RENDERBUFFER_INTERNAL_FORMAT, &format);
 564
 565         glGenRenderbuffers(1, &rbs[*numRbs]);
 566         glBindRenderbuffer(GL_RENDERBUFFER, rbs[*numRbs]);
 567         glRenderbufferStorage(GL_RENDERBUFFER, format, w, h);
 568         glFramebufferRenderbuffer(GL_FRAMEBUFFER, GL_DEPTH_STENCIL_ATTACHMENT,
 569                                   GL_RENDERBUFFER, rbs[*numRbs]);
 570         glBindFramebuffer(GL_READ_FRAMEBUFFER, oldFbo);
 571         glBindFramebuffer(GL_DRAW_FRAMEBUFFER, fbo);
 572         glBlitFramebuffer(0, 0, w, h, 0, 0, w, h,
 573                           GL_DEPTH_BUFFER_BIT | GL_STENCIL_BUFFER_BIT, GL_NEAREST);
 574         glBindFramebuffer(GL_FRAMEBUFFER, fbo);
 575         ++*numRbs;
 576     } else {
 577         if (depthRb) {
 578             glBindRenderbuffer(GL_RENDERBUFFER, depthRb);
 579             glGetRenderbufferParameteriv(GL_RENDERBUFFER,
 580                                          GL_RENDERBUFFER_WIDTH, &w);
 581             glGetRenderbufferParameteriv(GL_RENDERBUFFER,
 582                                          GL_RENDERBUFFER_HEIGHT, &h);
 583             glGetRenderbufferParameteriv(GL_RENDERBUFFER,
 584                                          GL_RENDERBUFFER_INTERNAL_FORMAT, &format);
 585
 586             glGenRenderbuffers(1, &rbs[*numRbs]);
 587             glBindRenderbuffer(GL_RENDERBUFFER, rbs[*numRbs]);
 588             glRenderbufferStorage(GL_RENDERBUFFER, format, w, h);
 589             glFramebufferRenderbuffer(GL_FRAMEBUFFER,
 590                                       GL_DEPTH_ATTACHMENT,
 591                                       GL_RENDERBUFFER, rbs[*numRbs]);
 592             glBindFramebuffer(GL_READ_FRAMEBUFFER, oldFbo);
 593             glBindFramebuffer(GL_DRAW_FRAMEBUFFER, fbo);
 594             glDrawBuffer(GL_DEPTH_ATTACHMENT);
 595             glReadBuffer(GL_DEPTH_ATTACHMENT);
 596             glBlitFramebuffer(0, 0, w, h, 0, 0, w, h,
 597                               GL_DEPTH_BUFFER_BIT, GL_NEAREST);
 598             ++*numRbs;
 599         }
 600         if (stencilRb) {
 601             glBindRenderbuffer(GL_RENDERBUFFER, stencilRb);
 602             glGetRenderbufferParameteriv(GL_RENDERBUFFER,
 603                                          GL_RENDERBUFFER_WIDTH, &w);
 604             glGetRenderbufferParameteriv(GL_RENDERBUFFER,
 605                                          GL_RENDERBUFFER_HEIGHT, &h);
 606             glGetRenderbufferParameteriv(GL_RENDERBUFFER,
 607                                      GL_RENDERBUFFER_INTERNAL_FORMAT, &format);
 608
 609             glGenRenderbuffers(1, &rbs[*numRbs]);
 610             glBindRenderbuffer(GL_RENDERBUFFER, rbs[*numRbs]);
 611             glRenderbufferStorage(GL_RENDERBUFFER, format, w, h);
 612             glFramebufferRenderbuffer(GL_FRAMEBUFFER,
 613                                       GL_STENCIL_ATTACHMENT,
 614                                       GL_RENDERBUFFER, rbs[*numRbs]);
 615             glBindFramebuffer(GL_READ_FRAMEBUFFER, oldFbo);
 616             glBindFramebuffer(GL_DRAW_FRAMEBUFFER, fbo);
 617             glDrawBuffer(GL_STENCIL_ATTACHMENT);
 618             glReadBuffer(GL_STENCIL_ATTACHMENT);
 619             glBlitFramebuffer(0, 0, w, h, 0, 0, w, h,
 620                               GL_STENCIL_BUFFER_BIT, GL_NEAREST);
 621             ++*numRbs;
 622         }
 623     }
 624
 625     return fbo;
 626 }
 627
 628
 629 static void
 630 dumpDrawBuffers(JSONWriter &json, GLboolean dumpDepth, GLboolean dumpStencil)
 631 {
 632     json.beginMember("GL_RGBA");
 633     dumpDrawBufferImage(json, GL_RGBA);
 634     json.endMember();
 635
 636     if (dumpDepth) {
 637         json.beginMember("GL_DEPTH_COMPONENT");
 638         dumpDrawBufferImage(json, GL_DEPTH_COMPONENT);
 639         json.endMember();
 640     }
 641
 642     if (dumpStencil) {
 643         json.beginMember("GL_STENCIL_INDEX");
 644         dumpDrawBufferImage(json, GL_STENCIL_INDEX);
 645         json.endMember();
 646     }
 647 }
 648
 649
 650 static void
 651 dumpFramebuffer(JSONWriter &json)
 652 {
 653     json.beginMember("framebuffer");
 654     json.beginObject();
 655
 656     GLint boundDrawFbo = 0, boundReadFbo = 0;
 657     glGetIntegerv(GL_DRAW_FRAMEBUFFER_BINDING, &boundDrawFbo);
 658     glGetIntegerv(GL_READ_FRAMEBUFFER_BINDING, &boundReadFbo);
 659     if (!boundDrawFbo) {
 660         GLint depth_bits = 0;
 661         glGetIntegerv(GL_DEPTH_BITS, &depth_bits);
 662         GLint stencil_bits = 0;
 663         glGetIntegerv(GL_STENCIL_BITS, &stencil_bits);
 664         dumpDrawBuffers(json, depth_bits, stencil_bits);
 665     } else {
 666         GLint colorRb, stencilRb, depthRb;
 667         GLint boundRb;
 668         glGetIntegerv(GL_RENDERBUFFER_BINDING, &boundRb);
 669         GLint drawbuffer = GL_NONE;
 670         glGetIntegerv(GL_DRAW_BUFFER, &drawbuffer);
 671
 672         glGetFramebufferAttachmentParameteriv(GL_FRAMEBUFFER,
 673                                               drawbuffer,
 674                                               GL_FRAMEBUFFER_ATTACHMENT_OBJECT_NAME,
 675                                               &colorRb);
 676         glGetFramebufferAttachmentParameteriv(GL_FRAMEBUFFER,
 677                                               GL_DEPTH_ATTACHMENT,
 678                                               GL_FRAMEBUFFER_ATTACHMENT_OBJECT_NAME,
 679                                               &depthRb);
 680         glGetFramebufferAttachmentParameteriv(GL_FRAMEBUFFER,
 681                                               GL_STENCIL_ATTACHMENT,
 682                                               GL_FRAMEBUFFER_ATTACHMENT_OBJECT_NAME,
 683                                               &stencilRb);
 684
 685         GLint colorSamples, depthSamples, stencilSamples;
 686         GLuint rbs[3];
 687         GLint numRbs = 0;
 688         GLuint fboCopy = 0;
 689         glBindRenderbuffer(GL_RENDERBUFFER, colorRb);
 690         glGetRenderbufferParameteriv(GL_RENDERBUFFER,
 691                                      GL_RENDERBUFFER_SAMPLES, &colorSamples);
 692         glBindRenderbuffer(GL_RENDERBUFFER, depthRb);
 693         glGetRenderbufferParameteriv(GL_RENDERBUFFER,
 694                                      GL_RENDERBUFFER_SAMPLES, &depthSamples);
 695         glBindRenderbuffer(GL_RENDERBUFFER, stencilRb);
 696         glGetRenderbufferParameteriv(GL_RENDERBUFFER,
 697                                      GL_RENDERBUFFER_SAMPLES, &stencilSamples);
 698         glBindRenderbuffer(GL_RENDERBUFFER, boundRb);
 699
 700         if (colorSamples || depthSamples || stencilSamples) {
 701             //glReadPixels doesnt support multisampled buffers so we need
 702             // to blit the fbo to a temporary one
 703             fboCopy = downsampledFramebuffer(boundDrawFbo, drawbuffer,
 704                                              colorRb, depthRb, stencilRb,
 705                                              rbs, &numRbs);
 706         }
 707         glDrawBuffer(drawbuffer);
 708         glReadBuffer(drawbuffer);
 709
 710         dumpDrawBuffers(json, depthRb, stencilRb);
 711
 712         if (fboCopy) {
 713             glBindFramebuffer(GL_FRAMEBUFFER, boundDrawFbo);
 714             glBindFramebuffer(GL_READ_FRAMEBUFFER, boundReadFbo);
 715             glBindFramebuffer(GL_DRAW_FRAMEBUFFER, boundDrawFbo);
 716             glBindRenderbuffer(GL_RENDERBUFFER_BINDING, boundRb);
 717             glDeleteRenderbuffers(numRbs, rbs);
 718             glDeleteFramebuffers(1, &fboCopy);
 719         }
 720     }
 721
 722     json.endObject();
 723     json.endMember(); // framebuffer
 724 }
 725
 726
 727 void dumpCurrentContext(std::ostream &os)
 728 {
 729     JSONWriter json(os);
 730     dumpParameters(json);
 731     dumpShaders(json);
 732     dumpTextures(json);
 733     dumpFramebuffer(json);
 734 }
 735
 736
 737 } /* namespace glstate */