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 static inline void
  66 dumpTextureImage(JSONWriter &json, Context &context, GLenum target, GLint level)
  67 {
  68     GLint width, height = 1, depth = 1;
  69     GLint format;
  70
  71     glGetTexLevelParameteriv(target, level, GL_TEXTURE_INTERNAL_FORMAT, &format);
  72
  73     width = 0;
  74     glGetTexLevelParameteriv(target, level, GL_TEXTURE_WIDTH, &width);
  75
  76     if (target != GL_TEXTURE_1D) {
  77         height = 0;
  78         glGetTexLevelParameteriv(target, level, GL_TEXTURE_HEIGHT, &height);
  79         if (target == GL_TEXTURE_3D) {
  80             depth = 0;
  81             glGetTexLevelParameteriv(target, level, GL_TEXTURE_DEPTH, &depth);
  82         }
  83     }
  84
  85     if (width <= 0 || height <= 0 || depth <= 0) {
  86         return;
  87     } else {
  88         char label[512];
  89
  90         GLint active_texture = GL_TEXTURE0;
  91         glGetIntegerv(GL_ACTIVE_TEXTURE, &active_texture);
  92         snprintf(label, sizeof label, "%s, %s, level = %d",
  93                  enumToString(active_texture), enumToString(target), level);
  94
  95         json.beginMember(label);
  96
  97         json.beginObject();
  98
  99         // Tell the GUI this is no ordinary object, but an image
 100         json.writeStringMember("__class__", "image");
 101
 102         json.writeNumberMember("__width__", width);
 103         json.writeNumberMember("__height__", height);
 104         json.writeNumberMember("__depth__", depth);
 105
 106         json.writeStringMember("__format__", enumToString(format));
 107
 108         // Hardcoded for now, but we could chose types more adequate to the
 109         // texture internal format
 110         json.writeStringMember("__type__", "uint8");
 111         json.writeBoolMember("__normalized__", true);
 112         json.writeNumberMember("__channels__", 4);
 113
 114         GLubyte *pixels = new GLubyte[depth*width*height*4];
 115
 116         context.resetPixelPackState();
 117
 118         glGetTexImage(target, level, GL_RGBA, GL_UNSIGNED_BYTE, pixels);
 119
 120         context.restorePixelPackState();
 121
 122         json.beginMember("__data__");
 123         char *pngBuffer;
 124         int pngBufferSize;
 125         image::writePixelsToBuffer(pixels, width, height, 4, true, &pngBuffer, &pngBufferSize);
 126         json.writeBase64(pngBuffer, pngBufferSize);
 127         free(pngBuffer);
 128         json.endMember(); // __data__
 129
 130         delete [] pixels;
 131         json.endObject();
 132     }
 133 }
 134
 135
 136 static inline void
 137 dumpTexture(JSONWriter &json, Context &context, GLenum target, GLenum binding)
 138 {
 139     GLint texture_binding = 0;
 140     glGetIntegerv(binding, &texture_binding);
 141     if (!glIsEnabled(target) && !texture_binding) {
 142         return;
 143     }
 144
 145     GLint level = 0;
 146     do {
 147         GLint width = 0, height = 0;
 148         glGetTexLevelParameteriv(target, level, GL_TEXTURE_WIDTH, &width);
 149         glGetTexLevelParameteriv(target, level, GL_TEXTURE_HEIGHT, &height);
 150         if (!width || !height) {
 151             break;
 152         }
 153
 154         if (target == GL_TEXTURE_CUBE_MAP) {
 155             for (int face = 0; face < 6; ++face) {
 156                 dumpTextureImage(json, context, GL_TEXTURE_CUBE_MAP_POSITIVE_X + face, level);
 157             }
 158         } else {
 159             dumpTextureImage(json, context, target, level);
 160         }
 161
 162         ++level;
 163     } while(true);
 164 }
 165
 166
 167 void
 168 dumpTextures(JSONWriter &json, Context &context)
 169 {
 170     json.beginMember("textures");
 171     json.beginObject();
 172     GLint active_texture = GL_TEXTURE0;
 173     glGetIntegerv(GL_ACTIVE_TEXTURE, &active_texture);
 174     GLint max_texture_coords = 0;
 175     glGetIntegerv(GL_MAX_TEXTURE_COORDS, &max_texture_coords);
 176     GLint max_combined_texture_image_units = 0;
 177     glGetIntegerv(GL_MAX_COMBINED_TEXTURE_IMAGE_UNITS, &max_combined_texture_image_units);
 178     GLint max_units = std::max(max_combined_texture_image_units, max_texture_coords);
 179     for (GLint unit = 0; unit < max_units; ++unit) {
 180         GLenum texture = GL_TEXTURE0 + unit;
 181         glActiveTexture(texture);
 182         dumpTexture(json, context, GL_TEXTURE_1D, GL_TEXTURE_BINDING_1D);
 183         dumpTexture(json, context, GL_TEXTURE_2D, GL_TEXTURE_BINDING_2D);
 184         dumpTexture(json, context, GL_TEXTURE_3D, GL_TEXTURE_BINDING_3D);
 185         dumpTexture(json, context, GL_TEXTURE_RECTANGLE, GL_TEXTURE_BINDING_RECTANGLE);
 186         dumpTexture(json, context, GL_TEXTURE_CUBE_MAP, GL_TEXTURE_BINDING_CUBE_MAP);
 187     }
 188     glActiveTexture(active_texture);
 189     json.endObject();
 190     json.endMember(); // textures
 191 }
 192
 193
 194 static bool
 195 getDrawableBounds(GLint *width, GLint *height) {
 196 #if defined(TRACE_EGL)
 197
 198     EGLContext currentContext = eglGetCurrentContext();
 199     if (currentContext == EGL_NO_CONTEXT) {
 200         return false;
 201     }
 202
 203     EGLSurface currentSurface = eglGetCurrentSurface(EGL_DRAW);
 204     if (currentSurface == EGL_NO_SURFACE) {
 205         return false;
 206     }
 207
 208     EGLDisplay currentDisplay = eglGetCurrentDisplay();
 209     if (currentDisplay == EGL_NO_DISPLAY) {
 210         return false;
 211     }
 212
 213     if (!eglQuerySurface(currentDisplay, currentSurface, EGL_WIDTH, width) ||
 214         !eglQuerySurface(currentDisplay, currentSurface, EGL_HEIGHT, height)) {
 215         return false;
 216     }
 217
 218     return true;
 219
 220 #elif defined(_WIN32)
 221
 222     HDC hDC = wglGetCurrentDC();
 223     if (!hDC) {
 224         return false;
 225     }
 226
 227     HWND hWnd = WindowFromDC(hDC);
 228     RECT rect;
 229
 230     if (!GetClientRect(hWnd, &rect)) {
 231        return false;
 232     }
 233
 234     *width  = rect.right  - rect.left;
 235     *height = rect.bottom - rect.top;
 236     return true;
 237
 238 #elif defined(__APPLE__)
 239
 240     CGLContextObj ctx = CGLGetCurrentContext();
 241     if (ctx == NULL) {
 242         return false;
 243     }
 244
 245     CGSConnectionID cid;
 246     CGSWindowID wid;
 247     CGSSurfaceID sid;
 248
 249     if (CGLGetSurface(ctx, &cid, &wid, &sid) != kCGLNoError) {
 250         return false;
 251     }
 252
 253     CGRect rect;
 254
 255     if (CGSGetSurfaceBounds(cid, wid, sid, &rect) != 0) {
 256         return false;
 257     }
 258
 259     *width = rect.size.width;
 260     *height = rect.size.height;
 261     return true;
 262
 263 #elif defined(HAVE_X11)
 264
 265     Display *display;
 266     Drawable drawable;
 267     Window root;
 268     int x, y;
 269     unsigned int w, h, bw, depth;
 270
 271     display = glXGetCurrentDisplay();
 272     if (!display) {
 273         return false;
 274     }
 275
 276     drawable = glXGetCurrentDrawable();
 277     if (drawable == None) {
 278         return false;
 279     }
 280
 281     if (!XGetGeometry(display, drawable, &root, &x, &y, &w, &h, &bw, &depth)) {
 282         return false;
 283     }
 284
 285     *width = w;
 286     *height = h;
 287     return true;
 288
 289 #else
 290
 291     return false;
 292
 293 #endif
 294 }
 295
 296
 297 static const GLenum texture_bindings[][2] = {
 298     {GL_TEXTURE_1D, GL_TEXTURE_BINDING_1D},
 299     {GL_TEXTURE_2D, GL_TEXTURE_BINDING_2D},
 300     {GL_TEXTURE_3D, GL_TEXTURE_BINDING_3D},
 301     {GL_TEXTURE_RECTANGLE, GL_TEXTURE_BINDING_RECTANGLE},
 302     {GL_TEXTURE_CUBE_MAP, GL_TEXTURE_BINDING_CUBE_MAP}
 303 };
 304
 305
 306 static bool
 307 bindTexture(GLint texture, GLenum &target, GLint &bound_texture)
 308 {
 309
 310     for (unsigned i = 0; i < sizeof(texture_bindings)/sizeof(texture_bindings[0]); ++i) {
 311         target  = texture_bindings[i][0];
 312
 313         GLenum binding = texture_bindings[i][1];
 314
 315         while (glGetError() != GL_NO_ERROR)
 316             ;
 317
 318         glGetIntegerv(binding, &bound_texture);
 319         glBindTexture(target, texture);
 320
 321         if (glGetError() == GL_NO_ERROR) {
 322             return true;
 323         }
 324
 325         glBindTexture(target, bound_texture);
 326     }
 327
 328     target = GL_NONE;
 329
 330     return false;
 331 }
 332
 333
 334 static bool
 335 getTextureLevelSize(GLint texture, GLint level, GLint *width, GLint *height)
 336 {
 337     *width = 0;
 338     *height = 0;
 339
 340     GLenum target;
 341     GLint bound_texture = 0;
 342     if (!bindTexture(texture, target, bound_texture)) {
 343         return false;
 344     }
 345
 346     glGetTexLevelParameteriv(target, level, GL_TEXTURE_WIDTH, width);
 347     glGetTexLevelParameteriv(target, level, GL_TEXTURE_HEIGHT, height);
 348
 349     glBindTexture(target, bound_texture);
 350
 351     return *width > 0 && *height > 0;
 352 }
 353
 354
 355 static GLenum
 356 getTextureLevelFormat(GLint texture, GLint level)
 357 {
 358     GLenum target;
 359     GLint bound_texture = 0;
 360     if (!bindTexture(texture, target, bound_texture)) {
 361         return GL_NONE;
 362     }
 363
 364     GLint format = GL_NONE;
 365     glGetTexLevelParameteriv(target, level, GL_TEXTURE_INTERNAL_FORMAT, &format);
 366
 367     glBindTexture(target, bound_texture);
 368
 369     return format;
 370 }
 371
 372
 373
 374 static bool
 375 getRenderbufferSize(GLint renderbuffer, GLint *width, GLint *height)
 376 {
 377     GLint bound_renderbuffer = 0;
 378     glGetIntegerv(GL_RENDERBUFFER_BINDING, &bound_renderbuffer);
 379     glBindRenderbuffer(GL_RENDERBUFFER, renderbuffer);
 380
 381     *width = 0;
 382     *height = 0;
 383     glGetRenderbufferParameteriv(GL_RENDERBUFFER, GL_RENDERBUFFER_WIDTH, width);
 384     glGetRenderbufferParameteriv(GL_RENDERBUFFER, GL_RENDERBUFFER_HEIGHT, height);
 385
 386     glBindRenderbuffer(GL_RENDERBUFFER, bound_renderbuffer);
 387
 388     return *width > 0 && *height > 0;
 389 }
 390
 391
 392 static GLenum
 393 getRenderbufferFormat(GLint renderbuffer)
 394 {
 395     GLint bound_renderbuffer = 0;
 396     glGetIntegerv(GL_RENDERBUFFER_BINDING, &bound_renderbuffer);
 397     glBindRenderbuffer(GL_RENDERBUFFER, renderbuffer);
 398
 399     GLint format = GL_NONE;
 400     glGetRenderbufferParameteriv(GL_RENDERBUFFER, GL_RENDERBUFFER_INTERNAL_FORMAT, &format);
 401
 402     glBindRenderbuffer(GL_RENDERBUFFER, bound_renderbuffer);
 403
 404     return format;
 405 }
 406
 407
 408 static bool
 409 getFramebufferAttachmentSize(GLenum target, GLenum attachment, GLint *width, GLint *height)
 410 {
 411     GLint object_type = GL_NONE;
 412     glGetFramebufferAttachmentParameteriv(target, attachment,
 413                                           GL_FRAMEBUFFER_ATTACHMENT_OBJECT_TYPE,
 414                                           &object_type);
 415     if (object_type == GL_NONE) {
 416         return false;
 417     }
 418
 419     GLint object_name = 0;
 420     glGetFramebufferAttachmentParameteriv(target, attachment,
 421                                           GL_FRAMEBUFFER_ATTACHMENT_OBJECT_NAME,
 422                                           &object_name);
 423     if (object_name == 0) {
 424         return false;
 425     }
 426
 427     if (object_type == GL_RENDERBUFFER) {
 428         return getRenderbufferSize(object_name, width, height);
 429     } else if (object_type == GL_TEXTURE) {
 430         GLint texture_level = 0;
 431         glGetFramebufferAttachmentParameteriv(target, attachment,
 432                                               GL_FRAMEBUFFER_ATTACHMENT_TEXTURE_LEVEL,
 433                                               &texture_level);
 434         return getTextureLevelSize(object_name, texture_level, width, height);
 435     } else {
 436         std::cerr << "warning: unexpected GL_FRAMEBUFFER_ATTACHMENT_OBJECT_TYPE = " << object_type << "\n";
 437         return false;
 438     }
 439 }
 440
 441
 442
 443 static GLint
 444 getFramebufferAttachmentFormat(GLenum target, GLenum attachment)
 445 {
 446     GLint object_type = GL_NONE;
 447     glGetFramebufferAttachmentParameteriv(target, attachment,
 448                                           GL_FRAMEBUFFER_ATTACHMENT_OBJECT_TYPE,
 449                                           &object_type);
 450     if (object_type == GL_NONE) {
 451         return GL_NONE;
 452     }
 453
 454     GLint object_name = 0;
 455     glGetFramebufferAttachmentParameteriv(target, attachment,
 456                                           GL_FRAMEBUFFER_ATTACHMENT_OBJECT_NAME,
 457                                           &object_name);
 458     if (object_name == 0) {
 459         return GL_NONE;
 460     }
 461
 462     if (object_type == GL_RENDERBUFFER) {
 463         return getRenderbufferFormat(object_name);
 464     } else if (object_type == GL_TEXTURE) {
 465         GLint texture_level = 0;
 466         glGetFramebufferAttachmentParameteriv(target, attachment,
 467                                               GL_FRAMEBUFFER_ATTACHMENT_TEXTURE_LEVEL,
 468                                               &texture_level);
 469         return getTextureLevelFormat(object_name, texture_level);
 470     } else {
 471         std::cerr << "warning: unexpected GL_FRAMEBUFFER_ATTACHMENT_OBJECT_TYPE = " << object_type << "\n";
 472         return GL_NONE;
 473     }
 474 }
 475
 476
 477
 478 image::Image *
 479 getDrawBufferImage() {
 480     GLenum format = GL_RGB;
 481     GLint channels = __gl_format_channels(format);
 482     if (channels > 4) {
 483         return NULL;
 484     }
 485
 486     Context context;
 487
 488     GLenum framebuffer_binding;
 489     GLenum framebuffer_target;
 490     if (context.ES) {
 491         framebuffer_binding = GL_FRAMEBUFFER_BINDING;
 492         framebuffer_target = GL_FRAMEBUFFER;
 493     } else {
 494         framebuffer_binding = GL_DRAW_FRAMEBUFFER_BINDING;
 495         framebuffer_target = GL_DRAW_FRAMEBUFFER;
 496     }
 497
 498     GLint draw_framebuffer = 0;
 499     glGetIntegerv(framebuffer_binding, &draw_framebuffer);
 500
 501     GLint draw_buffer = GL_NONE;
 502     GLint width, height;
 503     if (draw_framebuffer) {
 504         if (context.ARB_draw_buffers) {
 505             glGetIntegerv(GL_DRAW_BUFFER0, &draw_buffer);
 506             if (draw_buffer == GL_NONE) {
 507                 return NULL;
 508             }
 509         }
 510
 511         if (!getFramebufferAttachmentSize(framebuffer_target, draw_buffer, &width, &height)) {
 512             return NULL;
 513         }
 514     } else {
 515         if (!context.ES) {
 516             glGetIntegerv(GL_DRAW_BUFFER, &draw_buffer);
 517             if (draw_buffer == GL_NONE) {
 518                 return NULL;
 519             }
 520         }
 521
 522         if (!getDrawableBounds(&width, &height)) {
 523             return NULL;
 524         }
 525     }
 526
 527     GLenum type = GL_UNSIGNED_BYTE;
 528
 529 #if DEPTH_AS_RGBA
 530     if (format == GL_DEPTH_COMPONENT) {
 531         type = GL_UNSIGNED_INT;
 532         channels = 4;
 533     }
 534 #endif
 535
 536     image::Image *image = new image::Image(width, height, channels, true);
 537     if (!image) {
 538         return NULL;
 539     }
 540
 541     while (glGetError() != GL_NO_ERROR) {}
 542
 543     GLint read_framebuffer = 0;
 544     GLint read_buffer = GL_NONE;
 545     if (!context.ES) {
 546         glGetIntegerv(GL_READ_FRAMEBUFFER_BINDING, &read_framebuffer);
 547         glBindFramebuffer(GL_READ_FRAMEBUFFER, draw_framebuffer);
 548
 549         glGetIntegerv(GL_READ_BUFFER, &read_buffer);
 550         glReadBuffer(draw_buffer);
 551     }
 552
 553     // TODO: reset imaging state too
 554     context.resetPixelPackState();
 555
 556     glReadPixels(0, 0, width, height, format, type, image->pixels);
 557
 558     context.restorePixelPackState();
 559
 560     if (!context.ES) {
 561         glReadBuffer(read_buffer);
 562         glBindFramebuffer(GL_READ_FRAMEBUFFER, read_framebuffer);
 563     }
 564
 565     GLenum error = glGetError();
 566     if (error != GL_NO_ERROR) {
 567         do {
 568             std::cerr << "warning: " << enumToString(error) << " while getting snapshot\n";
 569             error = glGetError();
 570         } while(error != GL_NO_ERROR);
 571         delete image;
 572         return NULL;
 573     }
 574
 575     return image;
 576 }
 577
 578
 579 /**
 580  * Dump the image of the currently bound read buffer.
 581  */
 582 static inline void
 583 dumpReadBufferImage(JSONWriter &json, GLint width, GLint height, GLenum format,
 584                     GLint internalFormat = GL_NONE)
 585 {
 586     GLint channels = __gl_format_channels(format);
 587
 588     Context context;
 589
 590     json.beginObject();
 591
 592     // Tell the GUI this is no ordinary object, but an image
 593     json.writeStringMember("__class__", "image");
 594
 595     json.writeNumberMember("__width__", width);
 596     json.writeNumberMember("__height__", height);
 597     json.writeNumberMember("__depth__", 1);
 598
 599     json.writeStringMember("__format__", enumToString(internalFormat));
 600
 601     // Hardcoded for now, but we could chose types more adequate to the
 602     // texture internal format
 603     json.writeStringMember("__type__", "uint8");
 604     json.writeBoolMember("__normalized__", true);
 605     json.writeNumberMember("__channels__", channels);
 606
 607     GLenum type = GL_UNSIGNED_BYTE;
 608
 609 #if DEPTH_AS_RGBA
 610     if (format == GL_DEPTH_COMPONENT) {
 611         type = GL_UNSIGNED_INT;
 612         channels = 4;
 613     }
 614 #endif
 615
 616     GLubyte *pixels = new GLubyte[width*height*channels];
 617
 618     // TODO: reset imaging state too
 619     context.resetPixelPackState();
 620
 621     glReadPixels(0, 0, width, height, format, type, pixels);
 622
 623     context.restorePixelPackState();
 624
 625     json.beginMember("__data__");
 626     char *pngBuffer;
 627     int pngBufferSize;
 628     image::writePixelsToBuffer(pixels, width, height, channels, true, &pngBuffer, &pngBufferSize);
 629     //std::cerr <<" Before = "<<(width * height * channels * sizeof *pixels)
 630     //          <<", after = "<<pngBufferSize << ", ratio = " << double(width * height * channels * sizeof *pixels)/pngBufferSize;
 631     json.writeBase64(pngBuffer, pngBufferSize);
 632     free(pngBuffer);
 633     json.endMember(); // __data__
 634
 635     delete [] pixels;
 636     json.endObject();
 637 }
 638
 639
 640 static inline GLuint
 641 downsampledFramebuffer(GLuint oldFbo, GLint drawbuffer,
 642                        GLint colorRb, GLint depthRb, GLint stencilRb,
 643                        GLuint *rbs, GLint *numRbs)
 644 {
 645     GLuint fbo;
 646     GLint format;
 647     GLint w, h;
 648
 649     *numRbs = 0;
 650
 651     glGenFramebuffers(1, &fbo);
 652     glBindFramebuffer(GL_FRAMEBUFFER, fbo);
 653
 654     glBindRenderbuffer(GL_RENDERBUFFER, colorRb);
 655     glGetRenderbufferParameteriv(GL_RENDERBUFFER,
 656                                  GL_RENDERBUFFER_WIDTH, &w);
 657     glGetRenderbufferParameteriv(GL_RENDERBUFFER,
 658                                  GL_RENDERBUFFER_HEIGHT, &h);
 659     glGetRenderbufferParameteriv(GL_RENDERBUFFER,
 660                                  GL_RENDERBUFFER_INTERNAL_FORMAT, &format);
 661
 662     glGenRenderbuffers(1, &rbs[*numRbs]);
 663     glBindRenderbuffer(GL_RENDERBUFFER, rbs[*numRbs]);
 664     glRenderbufferStorage(GL_RENDERBUFFER, format, w, h);
 665     glFramebufferRenderbuffer(GL_FRAMEBUFFER, drawbuffer,
 666                               GL_RENDERBUFFER, rbs[*numRbs]);
 667
 668     glBindFramebuffer(GL_READ_FRAMEBUFFER, oldFbo);
 669     glBindFramebuffer(GL_DRAW_FRAMEBUFFER, fbo);
 670     glDrawBuffer(drawbuffer);
 671     glReadBuffer(drawbuffer);
 672     glBlitFramebuffer(0, 0, w, h, 0, 0, w, h,
 673                       GL_COLOR_BUFFER_BIT, GL_NEAREST);
 674     glBindFramebuffer(GL_FRAMEBUFFER, fbo);
 675     ++*numRbs;
 676
 677     if (stencilRb == depthRb && stencilRb) {
 678         //combined depth and stencil buffer
 679         glBindRenderbuffer(GL_RENDERBUFFER, depthRb);
 680         glGetRenderbufferParameteriv(GL_RENDERBUFFER,
 681                                      GL_RENDERBUFFER_WIDTH, &w);
 682         glGetRenderbufferParameteriv(GL_RENDERBUFFER,
 683                                      GL_RENDERBUFFER_HEIGHT, &h);
 684         glGetRenderbufferParameteriv(GL_RENDERBUFFER,
 685                                      GL_RENDERBUFFER_INTERNAL_FORMAT, &format);
 686
 687         glGenRenderbuffers(1, &rbs[*numRbs]);
 688         glBindRenderbuffer(GL_RENDERBUFFER, rbs[*numRbs]);
 689         glRenderbufferStorage(GL_RENDERBUFFER, format, w, h);
 690         glFramebufferRenderbuffer(GL_FRAMEBUFFER, GL_DEPTH_STENCIL_ATTACHMENT,
 691                                   GL_RENDERBUFFER, rbs[*numRbs]);
 692         glBindFramebuffer(GL_READ_FRAMEBUFFER, oldFbo);
 693         glBindFramebuffer(GL_DRAW_FRAMEBUFFER, fbo);
 694         glBlitFramebuffer(0, 0, w, h, 0, 0, w, h,
 695                           GL_DEPTH_BUFFER_BIT | GL_STENCIL_BUFFER_BIT, GL_NEAREST);
 696         glBindFramebuffer(GL_FRAMEBUFFER, fbo);
 697         ++*numRbs;
 698     } else {
 699         if (depthRb) {
 700             glBindRenderbuffer(GL_RENDERBUFFER, depthRb);
 701             glGetRenderbufferParameteriv(GL_RENDERBUFFER,
 702                                          GL_RENDERBUFFER_WIDTH, &w);
 703             glGetRenderbufferParameteriv(GL_RENDERBUFFER,
 704                                          GL_RENDERBUFFER_HEIGHT, &h);
 705             glGetRenderbufferParameteriv(GL_RENDERBUFFER,
 706                                          GL_RENDERBUFFER_INTERNAL_FORMAT, &format);
 707
 708             glGenRenderbuffers(1, &rbs[*numRbs]);
 709             glBindRenderbuffer(GL_RENDERBUFFER, rbs[*numRbs]);
 710             glRenderbufferStorage(GL_RENDERBUFFER, format, w, h);
 711             glFramebufferRenderbuffer(GL_FRAMEBUFFER,
 712                                       GL_DEPTH_ATTACHMENT,
 713                                       GL_RENDERBUFFER, rbs[*numRbs]);
 714             glBindFramebuffer(GL_READ_FRAMEBUFFER, oldFbo);
 715             glBindFramebuffer(GL_DRAW_FRAMEBUFFER, fbo);
 716             glDrawBuffer(GL_DEPTH_ATTACHMENT);
 717             glReadBuffer(GL_DEPTH_ATTACHMENT);
 718             glBlitFramebuffer(0, 0, w, h, 0, 0, w, h,
 719                               GL_DEPTH_BUFFER_BIT, GL_NEAREST);
 720             ++*numRbs;
 721         }
 722         if (stencilRb) {
 723             glBindRenderbuffer(GL_RENDERBUFFER, stencilRb);
 724             glGetRenderbufferParameteriv(GL_RENDERBUFFER,
 725                                          GL_RENDERBUFFER_WIDTH, &w);
 726             glGetRenderbufferParameteriv(GL_RENDERBUFFER,
 727                                          GL_RENDERBUFFER_HEIGHT, &h);
 728             glGetRenderbufferParameteriv(GL_RENDERBUFFER,
 729                                      GL_RENDERBUFFER_INTERNAL_FORMAT, &format);
 730
 731             glGenRenderbuffers(1, &rbs[*numRbs]);
 732             glBindRenderbuffer(GL_RENDERBUFFER, rbs[*numRbs]);
 733             glRenderbufferStorage(GL_RENDERBUFFER, format, w, h);
 734             glFramebufferRenderbuffer(GL_FRAMEBUFFER,
 735                                       GL_STENCIL_ATTACHMENT,
 736                                       GL_RENDERBUFFER, rbs[*numRbs]);
 737             glBindFramebuffer(GL_READ_FRAMEBUFFER, oldFbo);
 738             glBindFramebuffer(GL_DRAW_FRAMEBUFFER, fbo);
 739             glDrawBuffer(GL_STENCIL_ATTACHMENT);
 740             glReadBuffer(GL_STENCIL_ATTACHMENT);
 741             glBlitFramebuffer(0, 0, w, h, 0, 0, w, h,
 742                               GL_STENCIL_BUFFER_BIT, GL_NEAREST);
 743             ++*numRbs;
 744         }
 745     }
 746
 747     return fbo;
 748 }
 749
 750
 751 /**
 752  * Dump images of current draw drawable/window.
 753  */
 754 static void
 755 dumpDrawableImages(JSONWriter &json, Context &context)
 756 {
 757     GLint width, height;
 758
 759     if (!getDrawableBounds(&width, &height)) {
 760         return;
 761     }
 762
 763     GLint draw_buffer = GL_NONE;
 764     if (context.ES) {
 765         draw_buffer = GL_BACK;
 766     } else {
 767         glGetIntegerv(GL_DRAW_BUFFER, &draw_buffer);
 768         glReadBuffer(draw_buffer);
 769     }
 770
 771     if (draw_buffer != GL_NONE) {
 772         GLint read_buffer = GL_NONE;
 773         if (!context.ES) {
 774             glGetIntegerv(GL_READ_BUFFER, &read_buffer);
 775         }
 776
 777         GLint alpha_bits = 0;
 778 #if 0
 779         // XXX: Ignore alpha until we are able to match the traced visual
 780         glGetIntegerv(GL_ALPHA_BITS, &alpha_bits);
 781 #endif
 782         GLenum format = alpha_bits ? GL_RGBA : GL_RGB;
 783         json.beginMember(enumToString(draw_buffer));
 784         dumpReadBufferImage(json, width, height, format);
 785         json.endMember();
 786
 787         if (!context.ES) {
 788             glReadBuffer(read_buffer);
 789         }
 790     }
 791
 792     if (!context.ES) {
 793         GLint depth_bits = 0;
 794         glGetIntegerv(GL_DEPTH_BITS, &depth_bits);
 795         if (depth_bits) {
 796             json.beginMember("GL_DEPTH_COMPONENT");
 797             dumpReadBufferImage(json, width, height, GL_DEPTH_COMPONENT);
 798             json.endMember();
 799         }
 800
 801         GLint stencil_bits = 0;
 802         glGetIntegerv(GL_STENCIL_BITS, &stencil_bits);
 803         if (stencil_bits) {
 804             json.beginMember("GL_STENCIL_INDEX");
 805             dumpReadBufferImage(json, width, height, GL_STENCIL_INDEX);
 806             json.endMember();
 807         }
 808     }
 809 }
 810
 811
 812 /**
 813  * Dump the specified framebuffer attachment.
 814  *
 815  * In the case of a color attachment, it assumes it is already bound for read.
 816  */
 817 static void
 818 dumpFramebufferAttachment(JSONWriter &json, GLenum target, GLenum attachment, GLenum format)
 819 {
 820     GLint width = 0, height = 0;
 821     if (!getFramebufferAttachmentSize(target, attachment, &width, &height)) {
 822         return;
 823     }
 824
 825     GLint internalFormat = getFramebufferAttachmentFormat(target, attachment);
 826
 827     json.beginMember(enumToString(attachment));
 828     dumpReadBufferImage(json, width, height, format, internalFormat);
 829     json.endMember();
 830 }
 831
 832
 833 static void
 834 dumpFramebufferAttachments(JSONWriter &json, Context &context, GLenum target)
 835 {
 836     GLint read_framebuffer = 0;
 837     glGetIntegerv(GL_READ_FRAMEBUFFER_BINDING, &read_framebuffer);
 838
 839     GLint read_buffer = GL_NONE;
 840     glGetIntegerv(GL_READ_BUFFER, &read_buffer);
 841
 842     GLint max_draw_buffers = 1;
 843     glGetIntegerv(GL_MAX_DRAW_BUFFERS, &max_draw_buffers);
 844     GLint max_color_attachments = 0;
 845     glGetIntegerv(GL_MAX_COLOR_ATTACHMENTS, &max_color_attachments);
 846
 847     for (GLint i = 0; i < max_draw_buffers; ++i) {
 848         GLint draw_buffer = GL_NONE;
 849         glGetIntegerv(GL_DRAW_BUFFER0 + i, &draw_buffer);
 850         if (draw_buffer != GL_NONE) {
 851             glReadBuffer(draw_buffer);
 852             GLint attachment;
 853             if (draw_buffer >= GL_COLOR_ATTACHMENT0 && draw_buffer < GL_COLOR_ATTACHMENT0 + max_color_attachments) {
 854                 attachment = draw_buffer;
 855             } else {
 856                 std::cerr << "warning: unexpected GL_DRAW_BUFFER" << i << " = " << draw_buffer << "\n";
 857                 attachment = GL_COLOR_ATTACHMENT0;
 858             }
 859             GLint alpha_size = 0;
 860             glGetFramebufferAttachmentParameteriv(target, attachment,
 861                                                   GL_FRAMEBUFFER_ATTACHMENT_ALPHA_SIZE,
 862                                                   &alpha_size);
 863             GLenum format = alpha_size ? GL_RGBA : GL_RGB;
 864             dumpFramebufferAttachment(json, target, attachment, format);
 865         }
 866     }
 867
 868     glReadBuffer(read_buffer);
 869
 870     if (!context.ES) {
 871         dumpFramebufferAttachment(json, target, GL_DEPTH_ATTACHMENT, GL_DEPTH_COMPONENT);
 872         dumpFramebufferAttachment(json, target, GL_STENCIL_ATTACHMENT, GL_STENCIL_INDEX);
 873     }
 874
 875     glBindFramebuffer(GL_READ_FRAMEBUFFER, read_framebuffer);
 876 }
 877
 878
 879 void
 880 dumpFramebuffer(JSONWriter &json, Context &context)
 881 {
 882     json.beginMember("framebuffer");
 883     json.beginObject();
 884
 885     GLint boundDrawFbo = 0, boundReadFbo = 0;
 886     glGetIntegerv(GL_DRAW_FRAMEBUFFER_BINDING, &boundDrawFbo);
 887     glGetIntegerv(GL_READ_FRAMEBUFFER_BINDING, &boundReadFbo);
 888     if (!boundDrawFbo) {
 889         dumpDrawableImages(json, context);
 890     } else if (context.ES) {
 891         dumpFramebufferAttachments(json, context, GL_FRAMEBUFFER);
 892     } else {
 893         GLint colorRb = 0, stencilRb = 0, depthRb = 0;
 894         GLint draw_buffer0 = GL_NONE;
 895         glGetIntegerv(GL_DRAW_BUFFER0, &draw_buffer0);
 896         bool multisample = false;
 897
 898         GLint boundRb = 0;
 899         glGetIntegerv(GL_RENDERBUFFER_BINDING, &boundRb);
 900
 901         GLint object_type;
 902         glGetFramebufferAttachmentParameteriv(GL_DRAW_FRAMEBUFFER, draw_buffer0, GL_FRAMEBUFFER_ATTACHMENT_OBJECT_TYPE, &object_type);
 903         if (object_type == GL_RENDERBUFFER) {
 904             glGetFramebufferAttachmentParameteriv(GL_DRAW_FRAMEBUFFER, draw_buffer0, GL_FRAMEBUFFER_ATTACHMENT_OBJECT_NAME, &colorRb);
 905             glBindRenderbuffer(GL_RENDERBUFFER, colorRb);
 906             GLint samples = 0;
 907             glGetRenderbufferParameteriv(GL_RENDERBUFFER, GL_RENDERBUFFER_SAMPLES, &samples);
 908             if (samples) {
 909                 multisample = true;
 910             }
 911         }
 912
 913         glGetFramebufferAttachmentParameteriv(GL_DRAW_FRAMEBUFFER, GL_DEPTH_ATTACHMENT, GL_FRAMEBUFFER_ATTACHMENT_OBJECT_TYPE, &object_type);
 914         if (object_type == GL_RENDERBUFFER) {
 915             glGetFramebufferAttachmentParameteriv(GL_DRAW_FRAMEBUFFER, GL_DEPTH_ATTACHMENT, GL_FRAMEBUFFER_ATTACHMENT_OBJECT_NAME, &depthRb);
 916             glBindRenderbuffer(GL_RENDERBUFFER, depthRb);
 917             GLint samples = 0;
 918             glGetRenderbufferParameteriv(GL_RENDERBUFFER, GL_RENDERBUFFER_SAMPLES, &samples);
 919             if (samples) {
 920                 multisample = true;
 921             }
 922         }
 923
 924         glGetFramebufferAttachmentParameteriv(GL_DRAW_FRAMEBUFFER, GL_STENCIL_ATTACHMENT, GL_FRAMEBUFFER_ATTACHMENT_OBJECT_TYPE, &object_type);
 925         if (object_type == GL_RENDERBUFFER) {
 926             glGetFramebufferAttachmentParameteriv(GL_DRAW_FRAMEBUFFER, GL_STENCIL_ATTACHMENT, GL_FRAMEBUFFER_ATTACHMENT_OBJECT_NAME, &stencilRb);
 927             glBindRenderbuffer(GL_RENDERBUFFER, stencilRb);
 928             GLint samples = 0;
 929             glGetRenderbufferParameteriv(GL_RENDERBUFFER, GL_RENDERBUFFER_SAMPLES, &samples);
 930             if (samples) {
 931                 multisample = true;
 932             }
 933         }
 934
 935         glBindRenderbuffer(GL_RENDERBUFFER, boundRb);
 936
 937         GLuint rbs[3];
 938         GLint numRbs = 0;
 939         GLuint fboCopy = 0;
 940
 941         if (multisample) {
 942             // glReadPixels doesnt support multisampled buffers so we need
 943             // to blit the fbo to a temporary one
 944             fboCopy = downsampledFramebuffer(boundDrawFbo, draw_buffer0,
 945                                              colorRb, depthRb, stencilRb,
 946                                              rbs, &numRbs);
 947         }
 948
 949         dumpFramebufferAttachments(json, context, GL_DRAW_FRAMEBUFFER);
 950
 951         if (multisample) {
 952             glBindRenderbuffer(GL_RENDERBUFFER_BINDING, boundRb);
 953             glDeleteRenderbuffers(numRbs, rbs);
 954             glDeleteFramebuffers(1, &fboCopy);
 955         }
 956
 957         glBindFramebuffer(GL_READ_FRAMEBUFFER, boundReadFbo);
 958         glBindFramebuffer(GL_DRAW_FRAMEBUFFER, boundDrawFbo);
 959     }
 960
 961     json.endObject();
 962     json.endMember(); // framebuffer
 963 }
 964
 965
 966 } /* namespace glstate */