git.cworth.org Git - apitrace/blob - glstate_images.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
  32 #include "image.hpp"
  33 #include "json.hpp"
  34 #include "glproc.hpp"
  35 #include "glsize.hpp"
  36 #include "glstate.hpp"
  37 #include "glstate_internal.hpp"
  38
  39
  40 #ifdef __APPLE__
  41
  42 #include <Carbon/Carbon.h>
  43
  44 #ifdef __cplusplus
  45 extern "C" {
  46 #endif
  47
  48 OSStatus CGSGetSurfaceBounds(CGSConnectionID, CGWindowID, CGSSurfaceID, CGRect *);
  49
  50 #ifdef __cplusplus
  51 }
  52 #endif
  53
  54 #endif /* __APPLE__ */
  55
  56
  57 /* Change thi to one to force interpreting depth buffers as RGBA, which enables
  58  * visualizing full dynamic range, until we can transmit HDR images to the GUI */
  59 #define DEPTH_AS_RGBA 0
  60
  61
  62 namespace glstate {
  63
  64
  65 struct ImageDesc
  66 {
  67     GLint width;
  68     GLint height;
  69     GLint depth;
  70     GLint internalFormat;
  71
  72     inline
  73     ImageDesc() :
  74         width(0),
  75         height(0),
  76         depth(0),
  77         internalFormat(GL_NONE)
  78     {}
  79
  80     inline bool
  81     valid(void) const {
  82         return width > 0 && height > 0 && depth > 0;
  83     }
  84 };
  85
  86
  87 static inline bool
  88 getActiveTextureLevelDesc(Context &context, GLenum target, GLint level, ImageDesc &desc)
  89 {
  90     if (context.ES) {
  91         // XXX: OpenGL ES does not support glGetTexLevelParameteriv
  92         return false;
  93     }
  94
  95     glGetTexLevelParameteriv(target, level, GL_TEXTURE_INTERNAL_FORMAT, &desc.internalFormat);
  96
  97     desc.width = 0;
  98     glGetTexLevelParameteriv(target, level, GL_TEXTURE_WIDTH, &desc.width);
  99
 100     if (target == GL_TEXTURE_1D) {
 101         desc.height = 1;
 102         desc.depth = 1;
 103     } else {
 104         desc.height = 0;
 105         glGetTexLevelParameteriv(target, level, GL_TEXTURE_HEIGHT, &desc.height);
 106         if (target != GL_TEXTURE_3D) {
 107             desc.depth = 1;
 108         } else {
 109             desc.depth = 0;
 110             glGetTexLevelParameteriv(target, level, GL_TEXTURE_DEPTH, &desc.depth);
 111         }
 112     }
 113
 114     return desc.valid();
 115 }
 116
 117
 118 static inline void
 119 dumpActiveTextureLevel(JSONWriter &json, Context &context, GLenum target, GLint level)
 120 {
 121     ImageDesc desc;
 122     if (!getActiveTextureLevelDesc(context, target, level, desc)) {
 123         return;
 124     }
 125
 126     char label[512];
 127
 128     GLint active_texture = GL_TEXTURE0;
 129     glGetIntegerv(GL_ACTIVE_TEXTURE, &active_texture);
 130     snprintf(label, sizeof label, "%s, %s, level = %d",
 131              enumToString(active_texture), enumToString(target), level);
 132
 133     json.beginMember(label);
 134
 135     json.beginObject();
 136
 137     // Tell the GUI this is no ordinary object, but an image
 138     json.writeStringMember("__class__", "image");
 139
 140     json.writeNumberMember("__width__", desc.width);
 141     json.writeNumberMember("__height__", desc.height);
 142     json.writeNumberMember("__depth__", desc.depth);
 143
 144     json.writeStringMember("__format__", enumToString(desc.internalFormat));
 145
 146     // Hardcoded for now, but we could chose types more adequate to the
 147     // texture internal format
 148     json.writeStringMember("__type__", "uint8");
 149     json.writeBoolMember("__normalized__", true);
 150     json.writeNumberMember("__channels__", 4);
 151
 152     GLubyte *pixels = new GLubyte[desc.depth*desc.width*desc.height*4];
 153
 154     context.resetPixelPackState();
 155
 156     glGetTexImage(target, level, GL_RGBA, GL_UNSIGNED_BYTE, pixels);
 157
 158     context.restorePixelPackState();
 159
 160     json.beginMember("__data__");
 161     char *pngBuffer;
 162     int pngBufferSize;
 163     image::writePixelsToBuffer(pixels, desc.width, desc.height, 4, true, &pngBuffer, &pngBufferSize);
 164     json.writeBase64(pngBuffer, pngBufferSize);
 165     free(pngBuffer);
 166     json.endMember(); // __data__
 167
 168     delete [] pixels;
 169     json.endObject();
 170 }
 171
 172
 173 static inline void
 174 dumpTexture(JSONWriter &json, Context &context, GLenum target, GLenum binding)
 175 {
 176     GLint texture_binding = 0;
 177     glGetIntegerv(binding, &texture_binding);
 178     if (!glIsEnabled(target) && !texture_binding) {
 179         return;
 180     }
 181
 182     GLint level = 0;
 183     do {
 184         ImageDesc desc;
 185         if (!getActiveTextureLevelDesc(context, target, level, desc)) {
 186             break;
 187         }
 188
 189         if (target == GL_TEXTURE_CUBE_MAP) {
 190             for (int face = 0; face < 6; ++face) {
 191                 dumpActiveTextureLevel(json, context, GL_TEXTURE_CUBE_MAP_POSITIVE_X + face, level);
 192             }
 193         } else {
 194             dumpActiveTextureLevel(json, context, target, level);
 195         }
 196
 197         ++level;
 198     } while(true);
 199 }
 200
 201
 202 void
 203 dumpTextures(JSONWriter &json, Context &context)
 204 {
 205     json.beginMember("textures");
 206     json.beginObject();
 207     GLint active_texture = GL_TEXTURE0;
 208     glGetIntegerv(GL_ACTIVE_TEXTURE, &active_texture);
 209     GLint max_texture_coords = 0;
 210     glGetIntegerv(GL_MAX_TEXTURE_COORDS, &max_texture_coords);
 211     GLint max_combined_texture_image_units = 0;
 212     glGetIntegerv(GL_MAX_COMBINED_TEXTURE_IMAGE_UNITS, &max_combined_texture_image_units);
 213     GLint max_units = std::max(max_combined_texture_image_units, max_texture_coords);
 214     for (GLint unit = 0; unit < max_units; ++unit) {
 215         GLenum texture = GL_TEXTURE0 + unit;
 216         glActiveTexture(texture);
 217         dumpTexture(json, context, GL_TEXTURE_1D, GL_TEXTURE_BINDING_1D);
 218         dumpTexture(json, context, GL_TEXTURE_2D, GL_TEXTURE_BINDING_2D);
 219         dumpTexture(json, context, GL_TEXTURE_3D, GL_TEXTURE_BINDING_3D);
 220         dumpTexture(json, context, GL_TEXTURE_RECTANGLE, GL_TEXTURE_BINDING_RECTANGLE);
 221         dumpTexture(json, context, GL_TEXTURE_CUBE_MAP, GL_TEXTURE_BINDING_CUBE_MAP);
 222     }
 223     glActiveTexture(active_texture);
 224     json.endObject();
 225     json.endMember(); // textures
 226 }
 227
 228
 229 static bool
 230 getDrawableBounds(GLint *width, GLint *height) {
 231 #if defined(TRACE_EGL)
 232
 233     EGLContext currentContext = eglGetCurrentContext();
 234     if (currentContext == EGL_NO_CONTEXT) {
 235         return false;
 236     }
 237
 238     EGLSurface currentSurface = eglGetCurrentSurface(EGL_DRAW);
 239     if (currentSurface == EGL_NO_SURFACE) {
 240         return false;
 241     }
 242
 243     EGLDisplay currentDisplay = eglGetCurrentDisplay();
 244     if (currentDisplay == EGL_NO_DISPLAY) {
 245         return false;
 246     }
 247
 248     if (!eglQuerySurface(currentDisplay, currentSurface, EGL_WIDTH, width) ||
 249         !eglQuerySurface(currentDisplay, currentSurface, EGL_HEIGHT, height)) {
 250         return false;
 251     }
 252
 253     return true;
 254
 255 #elif defined(_WIN32)
 256
 257     HDC hDC = wglGetCurrentDC();
 258     if (!hDC) {
 259         return false;
 260     }
 261
 262     HWND hWnd = WindowFromDC(hDC);
 263     RECT rect;
 264
 265     if (!GetClientRect(hWnd, &rect)) {
 266        return false;
 267     }
 268
 269     *width  = rect.right  - rect.left;
 270     *height = rect.bottom - rect.top;
 271     return true;
 272
 273 #elif defined(__APPLE__)
 274
 275     CGLContextObj ctx = CGLGetCurrentContext();
 276     if (ctx == NULL) {
 277         return false;
 278     }
 279
 280     CGSConnectionID cid;
 281     CGSWindowID wid;
 282     CGSSurfaceID sid;
 283
 284     if (CGLGetSurface(ctx, &cid, &wid, &sid) != kCGLNoError) {
 285         return false;
 286     }
 287
 288     CGRect rect;
 289
 290     if (CGSGetSurfaceBounds(cid, wid, sid, &rect) != 0) {
 291         return false;
 292     }
 293
 294     *width = rect.size.width;
 295     *height = rect.size.height;
 296     return true;
 297
 298 #elif defined(HAVE_X11)
 299
 300     Display *display;
 301     Drawable drawable;
 302     Window root;
 303     int x, y;
 304     unsigned int w, h, bw, depth;
 305
 306     display = glXGetCurrentDisplay();
 307     if (!display) {
 308         return false;
 309     }
 310
 311     drawable = glXGetCurrentDrawable();
 312     if (drawable == None) {
 313         return false;
 314     }
 315
 316     if (!XGetGeometry(display, drawable, &root, &x, &y, &w, &h, &bw, &depth)) {
 317         return false;
 318     }
 319
 320     *width = w;
 321     *height = h;
 322     return true;
 323
 324 #else
 325
 326     return false;
 327
 328 #endif
 329 }
 330
 331
 332 static const GLenum texture_bindings[][2] = {
 333     {GL_TEXTURE_1D, GL_TEXTURE_BINDING_1D},
 334     {GL_TEXTURE_2D, GL_TEXTURE_BINDING_2D},
 335     {GL_TEXTURE_3D, GL_TEXTURE_BINDING_3D},
 336     {GL_TEXTURE_RECTANGLE, GL_TEXTURE_BINDING_RECTANGLE},
 337     {GL_TEXTURE_CUBE_MAP, GL_TEXTURE_BINDING_CUBE_MAP}
 338 };
 339
 340
 341 static bool
 342 bindTexture(GLint texture, GLenum &target, GLint &bound_texture)
 343 {
 344
 345     for (unsigned i = 0; i < sizeof(texture_bindings)/sizeof(texture_bindings[0]); ++i) {
 346         target  = texture_bindings[i][0];
 347
 348         GLenum binding = texture_bindings[i][1];
 349
 350         while (glGetError() != GL_NO_ERROR)
 351             ;
 352
 353         glGetIntegerv(binding, &bound_texture);
 354         glBindTexture(target, texture);
 355
 356         if (glGetError() == GL_NO_ERROR) {
 357             return true;
 358         }
 359
 360         glBindTexture(target, bound_texture);
 361     }
 362
 363     target = GL_NONE;
 364
 365     return false;
 366 }
 367
 368
 369 static bool
 370 getTextureLevelDesc(Context &context, GLint texture, GLint level, ImageDesc &desc)
 371 {
 372     GLenum target;
 373     GLint bound_texture = 0;
 374     if (!bindTexture(texture, target, bound_texture)) {
 375         return false;
 376     }
 377
 378     getActiveTextureLevelDesc(context, target, level, desc);
 379
 380     glBindTexture(target, bound_texture);
 381
 382     return desc.valid();
 383 }
 384
 385
 386 static bool
 387 getRenderbufferDesc(Context &context, GLint renderbuffer, ImageDesc &desc)
 388 {
 389     GLint bound_renderbuffer = 0;
 390     glGetIntegerv(GL_RENDERBUFFER_BINDING, &bound_renderbuffer);
 391     glBindRenderbuffer(GL_RENDERBUFFER, renderbuffer);
 392
 393     glGetRenderbufferParameteriv(GL_RENDERBUFFER, GL_RENDERBUFFER_WIDTH, &desc.width);
 394     glGetRenderbufferParameteriv(GL_RENDERBUFFER, GL_RENDERBUFFER_HEIGHT, &desc.height);
 395     desc.depth = 1;
 396
 397     glGetRenderbufferParameteriv(GL_RENDERBUFFER, GL_RENDERBUFFER_INTERNAL_FORMAT, &desc.internalFormat);
 398
 399     glBindRenderbuffer(GL_RENDERBUFFER, bound_renderbuffer);
 400
 401     return desc.valid();
 402 }
 403
 404
 405 static bool
 406 getFramebufferAttachmentDesc(Context &context, GLenum target, GLenum attachment, ImageDesc &desc)
 407 {
 408     GLint object_type = GL_NONE;
 409     glGetFramebufferAttachmentParameteriv(target, attachment,
 410                                           GL_FRAMEBUFFER_ATTACHMENT_OBJECT_TYPE,
 411                                           &object_type);
 412     if (object_type == GL_NONE) {
 413         return false;
 414     }
 415
 416     GLint object_name = 0;
 417     glGetFramebufferAttachmentParameteriv(target, attachment,
 418                                           GL_FRAMEBUFFER_ATTACHMENT_OBJECT_NAME,
 419                                           &object_name);
 420     if (object_name == 0) {
 421         return false;
 422     }
 423
 424     if (object_type == GL_RENDERBUFFER) {
 425         return getRenderbufferDesc(context, object_name, desc);
 426     } else if (object_type == GL_TEXTURE) {
 427         GLint texture_level = 0;
 428         glGetFramebufferAttachmentParameteriv(target, attachment,
 429                                               GL_FRAMEBUFFER_ATTACHMENT_TEXTURE_LEVEL,
 430                                               &texture_level);
 431         return getTextureLevelDesc(context, object_name, texture_level, desc);
 432     } else {
 433         std::cerr << "warning: unexpected GL_FRAMEBUFFER_ATTACHMENT_OBJECT_TYPE = " << object_type << "\n";
 434         return false;
 435     }
 436 }
 437
 438
 439
 440 image::Image *
 441 getDrawBufferImage() {
 442     GLenum format = GL_RGB;
 443     GLint channels = __gl_format_channels(format);
 444     if (channels > 4) {
 445         return NULL;
 446     }
 447
 448     Context context;
 449
 450     GLenum framebuffer_binding;
 451     GLenum framebuffer_target;
 452     if (context.ES) {
 453         framebuffer_binding = GL_FRAMEBUFFER_BINDING;
 454         framebuffer_target = GL_FRAMEBUFFER;
 455     } else {
 456         framebuffer_binding = GL_DRAW_FRAMEBUFFER_BINDING;
 457         framebuffer_target = GL_DRAW_FRAMEBUFFER;
 458     }
 459
 460     GLint draw_framebuffer = 0;
 461     glGetIntegerv(framebuffer_binding, &draw_framebuffer);
 462
 463     GLint draw_buffer = GL_NONE;
 464     ImageDesc desc;
 465     if (draw_framebuffer) {
 466         if (context.ARB_draw_buffers) {
 467             glGetIntegerv(GL_DRAW_BUFFER0, &draw_buffer);
 468             if (draw_buffer == GL_NONE) {
 469                 return NULL;
 470             }
 471         }
 472
 473         if (!getFramebufferAttachmentDesc(context, framebuffer_target, draw_buffer, desc)) {
 474             return NULL;
 475         }
 476     } else {
 477         if (!context.ES) {
 478             glGetIntegerv(GL_DRAW_BUFFER, &draw_buffer);
 479             if (draw_buffer == GL_NONE) {
 480                 return NULL;
 481             }
 482         }
 483
 484         if (!getDrawableBounds(&desc.width, &desc.height)) {
 485             return NULL;
 486         }
 487
 488         desc.depth = 1;
 489     }
 490
 491     GLenum type = GL_UNSIGNED_BYTE;
 492
 493 #if DEPTH_AS_RGBA
 494     if (format == GL_DEPTH_COMPONENT) {
 495         type = GL_UNSIGNED_INT;
 496         channels = 4;
 497     }
 498 #endif
 499
 500     image::Image *image = new image::Image(desc.width, desc.height, channels, true);
 501     if (!image) {
 502         return NULL;
 503     }
 504
 505     while (glGetError() != GL_NO_ERROR) {}
 506
 507     GLint read_framebuffer = 0;
 508     GLint read_buffer = GL_NONE;
 509     if (!context.ES) {
 510         glGetIntegerv(GL_READ_FRAMEBUFFER_BINDING, &read_framebuffer);
 511         glBindFramebuffer(GL_READ_FRAMEBUFFER, draw_framebuffer);
 512
 513         glGetIntegerv(GL_READ_BUFFER, &read_buffer);
 514         glReadBuffer(draw_buffer);
 515     }
 516
 517     // TODO: reset imaging state too
 518     context.resetPixelPackState();
 519
 520     glReadPixels(0, 0, desc.width, desc.height, format, type, image->pixels);
 521
 522     context.restorePixelPackState();
 523
 524     if (!context.ES) {
 525         glReadBuffer(read_buffer);
 526         glBindFramebuffer(GL_READ_FRAMEBUFFER, read_framebuffer);
 527     }
 528
 529     GLenum error = glGetError();
 530     if (error != GL_NO_ERROR) {
 531         do {
 532             std::cerr << "warning: " << enumToString(error) << " while getting snapshot\n";
 533             error = glGetError();
 534         } while(error != GL_NO_ERROR);
 535         delete image;
 536         return NULL;
 537     }
 538
 539     return image;
 540 }
 541
 542
 543 /**
 544  * Dump the image of the currently bound read buffer.
 545  */
 546 static inline void
 547 dumpReadBufferImage(JSONWriter &json, GLint width, GLint height, GLenum format,
 548                     GLint internalFormat = GL_NONE)
 549 {
 550     GLint channels = __gl_format_channels(format);
 551
 552     Context context;
 553
 554     json.beginObject();
 555
 556     // Tell the GUI this is no ordinary object, but an image
 557     json.writeStringMember("__class__", "image");
 558
 559     json.writeNumberMember("__width__", width);
 560     json.writeNumberMember("__height__", height);
 561     json.writeNumberMember("__depth__", 1);
 562
 563     json.writeStringMember("__format__", enumToString(internalFormat));
 564
 565     // Hardcoded for now, but we could chose types more adequate to the
 566     // texture internal format
 567     json.writeStringMember("__type__", "uint8");
 568     json.writeBoolMember("__normalized__", true);
 569     json.writeNumberMember("__channels__", channels);
 570
 571     GLenum type = GL_UNSIGNED_BYTE;
 572
 573 #if DEPTH_AS_RGBA
 574     if (format == GL_DEPTH_COMPONENT) {
 575         type = GL_UNSIGNED_INT;
 576         channels = 4;
 577     }
 578 #endif
 579
 580     GLubyte *pixels = new GLubyte[width*height*channels];
 581
 582     // TODO: reset imaging state too
 583     context.resetPixelPackState();
 584
 585     glReadPixels(0, 0, width, height, format, type, pixels);
 586
 587     context.restorePixelPackState();
 588
 589     json.beginMember("__data__");
 590     char *pngBuffer;
 591     int pngBufferSize;
 592     image::writePixelsToBuffer(pixels, width, height, channels, true, &pngBuffer, &pngBufferSize);
 593     //std::cerr <<" Before = "<<(width * height * channels * sizeof *pixels)
 594     //          <<", after = "<<pngBufferSize << ", ratio = " << double(width * height * channels * sizeof *pixels)/pngBufferSize;
 595     json.writeBase64(pngBuffer, pngBufferSize);
 596     free(pngBuffer);
 597     json.endMember(); // __data__
 598
 599     delete [] pixels;
 600     json.endObject();
 601 }
 602
 603
 604 static inline GLuint
 605 downsampledFramebuffer(GLuint oldFbo, GLint drawbuffer,
 606                        GLint colorRb, GLint depthRb, GLint stencilRb,
 607                        GLuint *rbs, GLint *numRbs)
 608 {
 609     GLuint fbo;
 610     GLint format;
 611     GLint w, h;
 612
 613     *numRbs = 0;
 614
 615     glGenFramebuffers(1, &fbo);
 616     glBindFramebuffer(GL_FRAMEBUFFER, fbo);
 617
 618     glBindRenderbuffer(GL_RENDERBUFFER, colorRb);
 619     glGetRenderbufferParameteriv(GL_RENDERBUFFER,
 620                                  GL_RENDERBUFFER_WIDTH, &w);
 621     glGetRenderbufferParameteriv(GL_RENDERBUFFER,
 622                                  GL_RENDERBUFFER_HEIGHT, &h);
 623     glGetRenderbufferParameteriv(GL_RENDERBUFFER,
 624                                  GL_RENDERBUFFER_INTERNAL_FORMAT, &format);
 625
 626     glGenRenderbuffers(1, &rbs[*numRbs]);
 627     glBindRenderbuffer(GL_RENDERBUFFER, rbs[*numRbs]);
 628     glRenderbufferStorage(GL_RENDERBUFFER, format, w, h);
 629     glFramebufferRenderbuffer(GL_FRAMEBUFFER, drawbuffer,
 630                               GL_RENDERBUFFER, rbs[*numRbs]);
 631
 632     glBindFramebuffer(GL_READ_FRAMEBUFFER, oldFbo);
 633     glBindFramebuffer(GL_DRAW_FRAMEBUFFER, fbo);
 634     glDrawBuffer(drawbuffer);
 635     glReadBuffer(drawbuffer);
 636     glBlitFramebuffer(0, 0, w, h, 0, 0, w, h,
 637                       GL_COLOR_BUFFER_BIT, GL_NEAREST);
 638     glBindFramebuffer(GL_FRAMEBUFFER, fbo);
 639     ++*numRbs;
 640
 641     if (stencilRb == depthRb && stencilRb) {
 642         //combined depth and stencil buffer
 643         glBindRenderbuffer(GL_RENDERBUFFER, depthRb);
 644         glGetRenderbufferParameteriv(GL_RENDERBUFFER,
 645                                      GL_RENDERBUFFER_WIDTH, &w);
 646         glGetRenderbufferParameteriv(GL_RENDERBUFFER,
 647                                      GL_RENDERBUFFER_HEIGHT, &h);
 648         glGetRenderbufferParameteriv(GL_RENDERBUFFER,
 649                                      GL_RENDERBUFFER_INTERNAL_FORMAT, &format);
 650
 651         glGenRenderbuffers(1, &rbs[*numRbs]);
 652         glBindRenderbuffer(GL_RENDERBUFFER, rbs[*numRbs]);
 653         glRenderbufferStorage(GL_RENDERBUFFER, format, w, h);
 654         glFramebufferRenderbuffer(GL_FRAMEBUFFER, GL_DEPTH_STENCIL_ATTACHMENT,
 655                                   GL_RENDERBUFFER, rbs[*numRbs]);
 656         glBindFramebuffer(GL_READ_FRAMEBUFFER, oldFbo);
 657         glBindFramebuffer(GL_DRAW_FRAMEBUFFER, fbo);
 658         glBlitFramebuffer(0, 0, w, h, 0, 0, w, h,
 659                           GL_DEPTH_BUFFER_BIT | GL_STENCIL_BUFFER_BIT, GL_NEAREST);
 660         glBindFramebuffer(GL_FRAMEBUFFER, fbo);
 661         ++*numRbs;
 662     } else {
 663         if (depthRb) {
 664             glBindRenderbuffer(GL_RENDERBUFFER, depthRb);
 665             glGetRenderbufferParameteriv(GL_RENDERBUFFER,
 666                                          GL_RENDERBUFFER_WIDTH, &w);
 667             glGetRenderbufferParameteriv(GL_RENDERBUFFER,
 668                                          GL_RENDERBUFFER_HEIGHT, &h);
 669             glGetRenderbufferParameteriv(GL_RENDERBUFFER,
 670                                          GL_RENDERBUFFER_INTERNAL_FORMAT, &format);
 671
 672             glGenRenderbuffers(1, &rbs[*numRbs]);
 673             glBindRenderbuffer(GL_RENDERBUFFER, rbs[*numRbs]);
 674             glRenderbufferStorage(GL_RENDERBUFFER, format, w, h);
 675             glFramebufferRenderbuffer(GL_FRAMEBUFFER,
 676                                       GL_DEPTH_ATTACHMENT,
 677                                       GL_RENDERBUFFER, rbs[*numRbs]);
 678             glBindFramebuffer(GL_READ_FRAMEBUFFER, oldFbo);
 679             glBindFramebuffer(GL_DRAW_FRAMEBUFFER, fbo);
 680             glDrawBuffer(GL_DEPTH_ATTACHMENT);
 681             glReadBuffer(GL_DEPTH_ATTACHMENT);
 682             glBlitFramebuffer(0, 0, w, h, 0, 0, w, h,
 683                               GL_DEPTH_BUFFER_BIT, GL_NEAREST);
 684             ++*numRbs;
 685         }
 686         if (stencilRb) {
 687             glBindRenderbuffer(GL_RENDERBUFFER, stencilRb);
 688             glGetRenderbufferParameteriv(GL_RENDERBUFFER,
 689                                          GL_RENDERBUFFER_WIDTH, &w);
 690             glGetRenderbufferParameteriv(GL_RENDERBUFFER,
 691                                          GL_RENDERBUFFER_HEIGHT, &h);
 692             glGetRenderbufferParameteriv(GL_RENDERBUFFER,
 693                                      GL_RENDERBUFFER_INTERNAL_FORMAT, &format);
 694
 695             glGenRenderbuffers(1, &rbs[*numRbs]);
 696             glBindRenderbuffer(GL_RENDERBUFFER, rbs[*numRbs]);
 697             glRenderbufferStorage(GL_RENDERBUFFER, format, w, h);
 698             glFramebufferRenderbuffer(GL_FRAMEBUFFER,
 699                                       GL_STENCIL_ATTACHMENT,
 700                                       GL_RENDERBUFFER, rbs[*numRbs]);
 701             glBindFramebuffer(GL_READ_FRAMEBUFFER, oldFbo);
 702             glBindFramebuffer(GL_DRAW_FRAMEBUFFER, fbo);
 703             glDrawBuffer(GL_STENCIL_ATTACHMENT);
 704             glReadBuffer(GL_STENCIL_ATTACHMENT);
 705             glBlitFramebuffer(0, 0, w, h, 0, 0, w, h,
 706                               GL_STENCIL_BUFFER_BIT, GL_NEAREST);
 707             ++*numRbs;
 708         }
 709     }
 710
 711     return fbo;
 712 }
 713
 714
 715 /**
 716  * Dump images of current draw drawable/window.
 717  */
 718 static void
 719 dumpDrawableImages(JSONWriter &json, Context &context)
 720 {
 721     GLint width, height;
 722
 723     if (!getDrawableBounds(&width, &height)) {
 724         return;
 725     }
 726
 727     GLint draw_buffer = GL_NONE;
 728     if (context.ES) {
 729         draw_buffer = GL_BACK;
 730     } else {
 731         glGetIntegerv(GL_DRAW_BUFFER, &draw_buffer);
 732         glReadBuffer(draw_buffer);
 733     }
 734
 735     if (draw_buffer != GL_NONE) {
 736         GLint read_buffer = GL_NONE;
 737         if (!context.ES) {
 738             glGetIntegerv(GL_READ_BUFFER, &read_buffer);
 739         }
 740
 741         GLint alpha_bits = 0;
 742 #if 0
 743         // XXX: Ignore alpha until we are able to match the traced visual
 744         glGetIntegerv(GL_ALPHA_BITS, &alpha_bits);
 745 #endif
 746         GLenum format = alpha_bits ? GL_RGBA : GL_RGB;
 747         json.beginMember(enumToString(draw_buffer));
 748         dumpReadBufferImage(json, width, height, format);
 749         json.endMember();
 750
 751         if (!context.ES) {
 752             glReadBuffer(read_buffer);
 753         }
 754     }
 755
 756     if (!context.ES) {
 757         GLint depth_bits = 0;
 758         glGetIntegerv(GL_DEPTH_BITS, &depth_bits);
 759         if (depth_bits) {
 760             json.beginMember("GL_DEPTH_COMPONENT");
 761             dumpReadBufferImage(json, width, height, GL_DEPTH_COMPONENT);
 762             json.endMember();
 763         }
 764
 765         GLint stencil_bits = 0;
 766         glGetIntegerv(GL_STENCIL_BITS, &stencil_bits);
 767         if (stencil_bits) {
 768             json.beginMember("GL_STENCIL_INDEX");
 769             dumpReadBufferImage(json, width, height, GL_STENCIL_INDEX);
 770             json.endMember();
 771         }
 772     }
 773 }
 774
 775
 776 /**
 777  * Dump the specified framebuffer attachment.
 778  *
 779  * In the case of a color attachment, it assumes it is already bound for read.
 780  */
 781 static void
 782 dumpFramebufferAttachment(JSONWriter &json, Context &context, GLenum target, GLenum attachment, GLenum format)
 783 {
 784     ImageDesc desc;
 785     if (!getFramebufferAttachmentDesc(context, target, attachment, desc)) {
 786         return;
 787     }
 788
 789     json.beginMember(enumToString(attachment));
 790     dumpReadBufferImage(json, desc.width, desc.height, format, desc.internalFormat);
 791     json.endMember();
 792 }
 793
 794
 795 static void
 796 dumpFramebufferAttachments(JSONWriter &json, Context &context, GLenum target)
 797 {
 798     GLint read_framebuffer = 0;
 799     glGetIntegerv(GL_READ_FRAMEBUFFER_BINDING, &read_framebuffer);
 800
 801     GLint read_buffer = GL_NONE;
 802     glGetIntegerv(GL_READ_BUFFER, &read_buffer);
 803
 804     GLint max_draw_buffers = 1;
 805     glGetIntegerv(GL_MAX_DRAW_BUFFERS, &max_draw_buffers);
 806     GLint max_color_attachments = 0;
 807     glGetIntegerv(GL_MAX_COLOR_ATTACHMENTS, &max_color_attachments);
 808
 809     for (GLint i = 0; i < max_draw_buffers; ++i) {
 810         GLint draw_buffer = GL_NONE;
 811         glGetIntegerv(GL_DRAW_BUFFER0 + i, &draw_buffer);
 812         if (draw_buffer != GL_NONE) {
 813             glReadBuffer(draw_buffer);
 814             GLint attachment;
 815             if (draw_buffer >= GL_COLOR_ATTACHMENT0 && draw_buffer < GL_COLOR_ATTACHMENT0 + max_color_attachments) {
 816                 attachment = draw_buffer;
 817             } else {
 818                 std::cerr << "warning: unexpected GL_DRAW_BUFFER" << i << " = " << draw_buffer << "\n";
 819                 attachment = GL_COLOR_ATTACHMENT0;
 820             }
 821             GLint alpha_size = 0;
 822             glGetFramebufferAttachmentParameteriv(target, attachment,
 823                                                   GL_FRAMEBUFFER_ATTACHMENT_ALPHA_SIZE,
 824                                                   &alpha_size);
 825             GLenum format = alpha_size ? GL_RGBA : GL_RGB;
 826             dumpFramebufferAttachment(json, context, target, attachment, format);
 827         }
 828     }
 829
 830     glReadBuffer(read_buffer);
 831
 832     if (!context.ES) {
 833         dumpFramebufferAttachment(json, context, target, GL_DEPTH_ATTACHMENT, GL_DEPTH_COMPONENT);
 834         dumpFramebufferAttachment(json, context, target, GL_STENCIL_ATTACHMENT, GL_STENCIL_INDEX);
 835     }
 836
 837     glBindFramebuffer(GL_READ_FRAMEBUFFER, read_framebuffer);
 838 }
 839
 840
 841 void
 842 dumpFramebuffer(JSONWriter &json, Context &context)
 843 {
 844     json.beginMember("framebuffer");
 845     json.beginObject();
 846
 847     GLint boundDrawFbo = 0, boundReadFbo = 0;
 848     glGetIntegerv(GL_DRAW_FRAMEBUFFER_BINDING, &boundDrawFbo);
 849     glGetIntegerv(GL_READ_FRAMEBUFFER_BINDING, &boundReadFbo);
 850     if (!boundDrawFbo) {
 851         dumpDrawableImages(json, context);
 852     } else if (context.ES) {
 853         dumpFramebufferAttachments(json, context, GL_FRAMEBUFFER);
 854     } else {
 855         GLint colorRb = 0, stencilRb = 0, depthRb = 0;
 856         GLint draw_buffer0 = GL_NONE;
 857         glGetIntegerv(GL_DRAW_BUFFER0, &draw_buffer0);
 858         bool multisample = false;
 859
 860         GLint boundRb = 0;
 861         glGetIntegerv(GL_RENDERBUFFER_BINDING, &boundRb);
 862
 863         GLint object_type;
 864         glGetFramebufferAttachmentParameteriv(GL_DRAW_FRAMEBUFFER, draw_buffer0, GL_FRAMEBUFFER_ATTACHMENT_OBJECT_TYPE, &object_type);
 865         if (object_type == GL_RENDERBUFFER) {
 866             glGetFramebufferAttachmentParameteriv(GL_DRAW_FRAMEBUFFER, draw_buffer0, GL_FRAMEBUFFER_ATTACHMENT_OBJECT_NAME, &colorRb);
 867             glBindRenderbuffer(GL_RENDERBUFFER, colorRb);
 868             GLint samples = 0;
 869             glGetRenderbufferParameteriv(GL_RENDERBUFFER, GL_RENDERBUFFER_SAMPLES, &samples);
 870             if (samples) {
 871                 multisample = true;
 872             }
 873         }
 874
 875         glGetFramebufferAttachmentParameteriv(GL_DRAW_FRAMEBUFFER, GL_DEPTH_ATTACHMENT, GL_FRAMEBUFFER_ATTACHMENT_OBJECT_TYPE, &object_type);
 876         if (object_type == GL_RENDERBUFFER) {
 877             glGetFramebufferAttachmentParameteriv(GL_DRAW_FRAMEBUFFER, GL_DEPTH_ATTACHMENT, GL_FRAMEBUFFER_ATTACHMENT_OBJECT_NAME, &depthRb);
 878             glBindRenderbuffer(GL_RENDERBUFFER, depthRb);
 879             GLint samples = 0;
 880             glGetRenderbufferParameteriv(GL_RENDERBUFFER, GL_RENDERBUFFER_SAMPLES, &samples);
 881             if (samples) {
 882                 multisample = true;
 883             }
 884         }
 885
 886         glGetFramebufferAttachmentParameteriv(GL_DRAW_FRAMEBUFFER, GL_STENCIL_ATTACHMENT, GL_FRAMEBUFFER_ATTACHMENT_OBJECT_TYPE, &object_type);
 887         if (object_type == GL_RENDERBUFFER) {
 888             glGetFramebufferAttachmentParameteriv(GL_DRAW_FRAMEBUFFER, GL_STENCIL_ATTACHMENT, GL_FRAMEBUFFER_ATTACHMENT_OBJECT_NAME, &stencilRb);
 889             glBindRenderbuffer(GL_RENDERBUFFER, stencilRb);
 890             GLint samples = 0;
 891             glGetRenderbufferParameteriv(GL_RENDERBUFFER, GL_RENDERBUFFER_SAMPLES, &samples);
 892             if (samples) {
 893                 multisample = true;
 894             }
 895         }
 896
 897         glBindRenderbuffer(GL_RENDERBUFFER, boundRb);
 898
 899         GLuint rbs[3];
 900         GLint numRbs = 0;
 901         GLuint fboCopy = 0;
 902
 903         if (multisample) {
 904             // glReadPixels doesnt support multisampled buffers so we need
 905             // to blit the fbo to a temporary one
 906             fboCopy = downsampledFramebuffer(boundDrawFbo, draw_buffer0,
 907                                              colorRb, depthRb, stencilRb,
 908                                              rbs, &numRbs);
 909         }
 910
 911         dumpFramebufferAttachments(json, context, GL_DRAW_FRAMEBUFFER);
 912
 913         if (multisample) {
 914             glBindRenderbuffer(GL_RENDERBUFFER_BINDING, boundRb);
 915             glDeleteRenderbuffers(numRbs, rbs);
 916             glDeleteFramebuffers(1, &fboCopy);
 917         }
 918
 919         glBindFramebuffer(GL_READ_FRAMEBUFFER, boundReadFbo);
 920         glBindFramebuffer(GL_DRAW_FRAMEBUFFER, boundDrawFbo);
 921     }
 922
 923     json.endObject();
 924     json.endMember(); // framebuffer
 925 }
 926
 927
 928 } /* namespace glstate */