git.cworth.org Git - apitrace/blob - retrace/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 <assert.h>
  28 #include <string.h>
  29
  30 #include <algorithm>
  31 #include <iostream>
  32
  33 #include "image.hpp"
  34 #include "json.hpp"
  35 #include "glproc.hpp"
  36 #include "glsize.hpp"
  37 #include "glstate.hpp"
  38 #include "glstate_internal.hpp"
  39
  40
  41 #ifdef __linux__
  42 #include <dlfcn.h>
  43 #endif
  44
  45 #ifdef __APPLE__
  46
  47 #include <Carbon/Carbon.h>
  48
  49 #ifdef __cplusplus
  50 extern "C" {
  51 #endif
  52
  53 OSStatus CGSGetSurfaceBounds(CGSConnectionID, CGWindowID, CGSSurfaceID, CGRect *);
  54
  55 #ifdef __cplusplus
  56 }
  57 #endif
  58
  59 #endif /* __APPLE__ */
  60
  61
  62 /* Change thi to one to force interpreting depth buffers as RGBA, which enables
  63  * visualizing full dynamic range, until we can transmit HDR images to the GUI */
  64 #define DEPTH_AS_RGBA 0
  65
  66
  67 namespace glstate {
  68
  69
  70 struct ImageDesc
  71 {
  72     GLint width;
  73     GLint height;
  74     GLint depth;
  75     GLint internalFormat;
  76
  77     inline
  78     ImageDesc() :
  79         width(0),
  80         height(0),
  81         depth(0),
  82         internalFormat(GL_NONE)
  83     {}
  84
  85     inline bool
  86     valid(void) const {
  87         return width > 0 && height > 0 && depth > 0;
  88     }
  89 };
  90
  91
  92 /**
  93  * Sames as enumToString, but with special provision to handle formatsLUMINANCE_ALPHA.
  94  *
  95  * OpenGL 2.1 specification states that "internalFormat may (for backwards
  96  * compatibility with the 1.0 version of the GL) also take on the integer
  97  * values 1, 2, 3, and 4, which are equivalent to symbolic constants LUMINANCE,
  98  * LUMINANCE ALPHA, RGB, and RGBA respectively".
  99  */
 100 const char *
 101 formatToString(GLenum internalFormat) {
 102     switch (internalFormat) {
 103     case 1:
 104         return "GL_LUMINANCE";
 105     case 2:
 106         return "GL_LUMINANCE_ALPHA";
 107     case 3:
 108         return "GL_RGB";
 109     case 4:
 110         return "GL_RGBA";
 111     default:
 112         return enumToString(internalFormat);
 113     }
 114 }
 115
 116
 117 /**
 118  * OpenGL ES does not support glGetTexLevelParameteriv, but it is possible to
 119  * probe whether a texture has a given size by crafting a dummy glTexSubImage()
 120  * call.
 121  */
 122 static bool
 123 probeTextureLevelSizeOES(GLenum target, GLint level, const GLint size[3]) {
 124     while (glGetError() != GL_NO_ERROR)
 125         ;
 126
 127     GLenum internalFormat = GL_RGBA;
 128     GLenum type = GL_UNSIGNED_BYTE;
 129     GLint dummy = 0;
 130
 131     switch (target) {
 132     case GL_TEXTURE_2D:
 133     case GL_TEXTURE_CUBE_MAP:
 134     case GL_TEXTURE_CUBE_MAP_POSITIVE_X:
 135     case GL_TEXTURE_CUBE_MAP_NEGATIVE_X:
 136     case GL_TEXTURE_CUBE_MAP_POSITIVE_Y:
 137     case GL_TEXTURE_CUBE_MAP_NEGATIVE_Y:
 138     case GL_TEXTURE_CUBE_MAP_POSITIVE_Z:
 139     case GL_TEXTURE_CUBE_MAP_NEGATIVE_Z:
 140         glTexSubImage2D(target, level, size[0], size[1], 0, 0, internalFormat, type, &dummy);
 141         break;
 142     case GL_TEXTURE_3D_OES:
 143         glTexSubImage3DOES(target, level, size[0], size[1], size[2], 0, 0, 0, internalFormat, type, &dummy);
 144     default:
 145         assert(0);
 146         return false;
 147     }
 148
 149     GLenum error = glGetError();
 150
 151     if (0) {
 152         std::cerr << "(" << size[0] << ", " << size[1] << ", " << size[2] << ") = " << enumToString(error) << "\n";
 153     }
 154
 155     if (error == GL_NO_ERROR) {
 156         return true;
 157     }
 158
 159     while (glGetError() != GL_NO_ERROR)
 160         ;
 161
 162     return false;
 163 }
 164
 165
 166 /**
 167  * Bisect the texture size along an axis.
 168  *
 169  * It is assumed that the texture exists.
 170  */
 171 static GLint
 172 bisectTextureLevelSizeOES(GLenum target, GLint level, GLint axis, GLint max) {
 173     GLint size[3] = {0, 0, 0};
 174
 175     assert(axis < 3);
 176     assert(max >= 0);
 177
 178     GLint min = 0;
 179     while (true) {
 180         GLint test = (min + max) / 2;
 181         if (test == min) {
 182             return min;
 183         }
 184
 185         size[axis] = test;
 186
 187         if (probeTextureLevelSizeOES(target, level, size)) {
 188             min = test;
 189         } else {
 190             max = test;
 191         }
 192     }
 193 }
 194
 195
 196 /**
 197  * Special path to obtain texture size on OpenGL ES, that does not rely on
 198  * glGetTexLevelParameteriv
 199  */
 200 static bool
 201 getActiveTextureLevelDescOES(Context &context, GLenum target, GLint level, ImageDesc &desc)
 202 {
 203     if (target == GL_TEXTURE_1D) {
 204         // OpenGL ES does not support 1D textures
 205         return false;
 206     }
 207
 208     const GLint size[3] = {1, 1, 1};
 209     if (!probeTextureLevelSizeOES(target, level, size)) {
 210         return false;
 211     }
 212
 213     // XXX: mere guess
 214     desc.internalFormat = GL_RGBA;
 215
 216     GLint maxSize = 0;
 217     switch (target) {
 218     case GL_TEXTURE_2D:
 219         glGetIntegerv(GL_MAX_TEXTURE_SIZE, &maxSize);
 220         desc.width = bisectTextureLevelSizeOES(target, level, 0, maxSize);
 221         desc.height = bisectTextureLevelSizeOES(target, level, 1, maxSize);
 222         desc.depth = 1;
 223         break;
 224     case GL_TEXTURE_CUBE_MAP:
 225     case GL_TEXTURE_CUBE_MAP_POSITIVE_X:
 226     case GL_TEXTURE_CUBE_MAP_NEGATIVE_X:
 227     case GL_TEXTURE_CUBE_MAP_POSITIVE_Y:
 228     case GL_TEXTURE_CUBE_MAP_NEGATIVE_Y:
 229     case GL_TEXTURE_CUBE_MAP_POSITIVE_Z:
 230     case GL_TEXTURE_CUBE_MAP_NEGATIVE_Z:
 231         glGetIntegerv(GL_MAX_CUBE_MAP_TEXTURE_SIZE, &maxSize);
 232         desc.width = bisectTextureLevelSizeOES(target, level, 0, maxSize);
 233         desc.height = desc.width;
 234         desc.depth = 1;
 235         break;
 236     case GL_TEXTURE_3D_OES:
 237         glGetIntegerv(GL_MAX_3D_TEXTURE_SIZE_OES, &maxSize);
 238         desc.width = bisectTextureLevelSizeOES(target, level, 0, maxSize);
 239         desc.width = bisectTextureLevelSizeOES(target, level, 1, maxSize);
 240         desc.depth = bisectTextureLevelSizeOES(target, level, 2, maxSize);
 241         break;
 242     default:
 243         return false;
 244     }
 245
 246     if (0) {
 247         std::cerr
 248             << enumToString(target) << " "
 249             << level << " "
 250             << desc.width << "x" << desc.height << "x" << desc.depth
 251             << "\n";
 252     }
 253
 254     return desc.valid();
 255 }
 256
 257
 258 static inline bool
 259 getActiveTextureLevelDesc(Context &context, GLenum target, GLint level, ImageDesc &desc)
 260 {
 261     assert(target != GL_TEXTURE_CUBE_MAP);
 262
 263     if (context.ES) {
 264         return getActiveTextureLevelDescOES(context, target, level, desc);
 265     }
 266
 267     glGetTexLevelParameteriv(target, level, GL_TEXTURE_INTERNAL_FORMAT, &desc.internalFormat);
 268
 269     desc.width = 0;
 270     glGetTexLevelParameteriv(target, level, GL_TEXTURE_WIDTH, &desc.width);
 271
 272     if (target == GL_TEXTURE_1D) {
 273         desc.height = 1;
 274         desc.depth = 1;
 275     } else {
 276         desc.height = 0;
 277         glGetTexLevelParameteriv(target, level, GL_TEXTURE_HEIGHT, &desc.height);
 278         if (target != GL_TEXTURE_3D) {
 279             desc.depth = 1;
 280         } else {
 281             desc.depth = 0;
 282             glGetTexLevelParameteriv(target, level, GL_TEXTURE_DEPTH, &desc.depth);
 283         }
 284     }
 285
 286     return desc.valid();
 287 }
 288
 289
 290 /**
 291  * OpenGL ES does not support glGetTexImage. Obtain the pixels by attaching the
 292  * texture to a framebuffer.
 293  */
 294 static inline void
 295 getTexImageOES(GLenum target, GLint level, ImageDesc &desc, GLubyte *pixels)
 296 {
 297     memset(pixels, 0x80, desc.height * desc.width * 4);
 298
 299     GLenum texture_binding = GL_NONE;
 300     switch (target) {
 301     case GL_TEXTURE_2D:
 302         texture_binding = GL_TEXTURE_BINDING_2D;
 303         break;
 304     case GL_TEXTURE_CUBE_MAP_POSITIVE_X:
 305     case GL_TEXTURE_CUBE_MAP_NEGATIVE_X:
 306     case GL_TEXTURE_CUBE_MAP_POSITIVE_Y:
 307     case GL_TEXTURE_CUBE_MAP_NEGATIVE_Y:
 308     case GL_TEXTURE_CUBE_MAP_POSITIVE_Z:
 309     case GL_TEXTURE_CUBE_MAP_NEGATIVE_Z:
 310         texture_binding = GL_TEXTURE_BINDING_CUBE_MAP;
 311         break;
 312     case GL_TEXTURE_3D_OES:
 313         texture_binding = GL_TEXTURE_BINDING_3D_OES;
 314     default:
 315         return;
 316     }
 317
 318     GLint texture = 0;
 319     glGetIntegerv(texture_binding, &texture);
 320     if (!texture) {
 321         return;
 322     }
 323
 324     GLint prev_fbo = 0;
 325     GLuint fbo = 0;
 326     glGetIntegerv(GL_FRAMEBUFFER_BINDING, &prev_fbo);
 327     glGenFramebuffers(1, &fbo);
 328     glBindFramebuffer(GL_FRAMEBUFFER, fbo);
 329
 330     GLenum status;
 331
 332     switch (target) {
 333     case GL_TEXTURE_2D:
 334     case GL_TEXTURE_CUBE_MAP_POSITIVE_X:
 335     case GL_TEXTURE_CUBE_MAP_NEGATIVE_X:
 336     case GL_TEXTURE_CUBE_MAP_POSITIVE_Y:
 337     case GL_TEXTURE_CUBE_MAP_NEGATIVE_Y:
 338     case GL_TEXTURE_CUBE_MAP_POSITIVE_Z:
 339     case GL_TEXTURE_CUBE_MAP_NEGATIVE_Z:
 340         glFramebufferTexture2D(GL_FRAMEBUFFER, GL_COLOR_ATTACHMENT0, GL_TEXTURE_2D, texture, level);
 341         status = glCheckFramebufferStatus(GL_FRAMEBUFFER);
 342         if (status != GL_FRAMEBUFFER_COMPLETE) {
 343             std::cerr << __FUNCTION__ << ": " << enumToString(status) << "\n";
 344         }
 345         glReadPixels(0, 0, desc.width, desc.height, GL_RGBA, GL_UNSIGNED_BYTE, pixels);
 346         break;
 347     case GL_TEXTURE_3D_OES:
 348         for (int i = 0; i < desc.depth; i++) {
 349             glFramebufferTexture3D(GL_FRAMEBUFFER, GL_COLOR_ATTACHMENT0, GL_TEXTURE_3D, texture, level, i);
 350             glReadPixels(0, 0, desc.width, desc.height, GL_RGBA, GL_UNSIGNED_BYTE, pixels + 4 * i * desc.width * desc.height);
 351         }
 352         break;
 353     }
 354
 355     glBindFramebuffer(GL_FRAMEBUFFER, prev_fbo);
 356
 357     glDeleteFramebuffers(1, &fbo);
 358 }
 359
 360
 361 static inline GLboolean
 362 isDepthFormat(GLenum internalFormat)
 363 {
 364    switch (internalFormat) {
 365    case GL_DEPTH_COMPONENT:
 366    case GL_DEPTH_COMPONENT16:
 367    case GL_DEPTH_COMPONENT24:
 368    case GL_DEPTH_COMPONENT32:
 369    case GL_DEPTH_COMPONENT32F:
 370    case GL_DEPTH_COMPONENT32F_NV:
 371    case GL_DEPTH_STENCIL:
 372    case GL_DEPTH24_STENCIL8:
 373    case GL_DEPTH32F_STENCIL8:
 374    case GL_DEPTH32F_STENCIL8_NV:
 375       return GL_TRUE;
 376    }
 377    return GL_FALSE;
 378 }
 379
 380
 381 static inline void
 382 dumpActiveTextureLevel(JSONWriter &json, Context &context, GLenum target, GLint level)
 383 {
 384     ImageDesc desc;
 385     if (!getActiveTextureLevelDesc(context, target, level, desc)) {
 386         return;
 387     }
 388
 389     char label[512];
 390     GLint active_texture = GL_TEXTURE0;
 391     glGetIntegerv(GL_ACTIVE_TEXTURE, &active_texture);
 392     snprintf(label, sizeof label, "%s, %s, level = %d",
 393              enumToString(active_texture), enumToString(target), level);
 394
 395     json.beginMember(label);
 396
 397     GLuint channels;
 398     GLenum format;
 399     if (!context.ES && isDepthFormat(desc.internalFormat)) {
 400        format = GL_DEPTH_COMPONENT;
 401        channels = 1;
 402     } else {
 403        format = GL_RGBA;
 404        channels = 4;
 405     }
 406
 407     image::Image *image = new image::Image(desc.width, desc.height*desc.depth, channels, true);
 408
 409     context.resetPixelPackState();
 410
 411     if (context.ES) {
 412         getTexImageOES(target, level, desc, image->pixels);
 413     } else {
 414         glGetTexImage(target, level, format, GL_UNSIGNED_BYTE, image->pixels);
 415     }
 416
 417     context.restorePixelPackState();
 418
 419     json.writeImage(image, formatToString(desc.internalFormat), desc.depth);
 420
 421     delete image;
 422
 423     json.endMember(); // label
 424 }
 425
 426
 427 static inline void
 428 dumpTexture(JSONWriter &json, Context &context, GLenum target, GLenum binding)
 429 {
 430     GLint texture_binding = 0;
 431     glGetIntegerv(binding, &texture_binding);
 432     if (!glIsEnabled(target) && !texture_binding) {
 433         return;
 434     }
 435
 436     GLint level = 0;
 437     do {
 438         ImageDesc desc;
 439
 440         if (target == GL_TEXTURE_CUBE_MAP) {
 441             for (int face = 0; face < 6; ++face) {
 442                 if (!getActiveTextureLevelDesc(context, GL_TEXTURE_CUBE_MAP_POSITIVE_X + face, level, desc)) {
 443                     return;
 444                 }
 445                 dumpActiveTextureLevel(json, context, GL_TEXTURE_CUBE_MAP_POSITIVE_X + face, level);
 446             }
 447         } else {
 448             if (!getActiveTextureLevelDesc(context, target, level, desc)) {
 449                 return;
 450             }
 451             dumpActiveTextureLevel(json, context, target, level);
 452         }
 453
 454         ++level;
 455     } while(true);
 456 }
 457
 458
 459 void
 460 dumpTextures(JSONWriter &json, Context &context)
 461 {
 462     json.beginMember("textures");
 463     json.beginObject();
 464     GLint active_texture = GL_TEXTURE0;
 465     glGetIntegerv(GL_ACTIVE_TEXTURE, &active_texture);
 466
 467     GLint max_texture_coords = 0;
 468     glGetIntegerv(GL_MAX_TEXTURE_COORDS, &max_texture_coords);
 469     GLint max_combined_texture_image_units = 0;
 470     glGetIntegerv(GL_MAX_COMBINED_TEXTURE_IMAGE_UNITS, &max_combined_texture_image_units);
 471     GLint max_units = std::max(max_combined_texture_image_units, max_texture_coords);
 472
 473     /*
 474      * At least the Android software GL implementation doesn't return the
 475      * proper value for this, but rather returns 0. The GL(ES) specification
 476      * mandates a minimum value of 2, so use this as a fall-back value.
 477      */
 478     max_units = std::max(max_units, 2);
 479
 480     for (GLint unit = 0; unit < max_units; ++unit) {
 481         GLenum texture = GL_TEXTURE0 + unit;
 482         glActiveTexture(texture);
 483         dumpTexture(json, context, GL_TEXTURE_1D, GL_TEXTURE_BINDING_1D);
 484         dumpTexture(json, context, GL_TEXTURE_2D, GL_TEXTURE_BINDING_2D);
 485         dumpTexture(json, context, GL_TEXTURE_3D, GL_TEXTURE_BINDING_3D);
 486         dumpTexture(json, context, GL_TEXTURE_RECTANGLE, GL_TEXTURE_BINDING_RECTANGLE);
 487         dumpTexture(json, context, GL_TEXTURE_CUBE_MAP, GL_TEXTURE_BINDING_CUBE_MAP);
 488     }
 489     glActiveTexture(active_texture);
 490     json.endObject();
 491     json.endMember(); // textures
 492 }
 493
 494
 495 static bool
 496 getDrawableBounds(GLint *width, GLint *height) {
 497 #if defined(__linux__)
 498     if (dlsym(RTLD_DEFAULT, "eglGetCurrentContext")) {
 499         EGLContext currentContext = eglGetCurrentContext();
 500         if (currentContext == EGL_NO_CONTEXT) {
 501             return false;
 502         }
 503
 504         EGLSurface currentSurface = eglGetCurrentSurface(EGL_DRAW);
 505         if (currentSurface == EGL_NO_SURFACE) {
 506             return false;
 507         }
 508
 509         EGLDisplay currentDisplay = eglGetCurrentDisplay();
 510         if (currentDisplay == EGL_NO_DISPLAY) {
 511             return false;
 512         }
 513
 514         if (!eglQuerySurface(currentDisplay, currentSurface, EGL_WIDTH, width) ||
 515             !eglQuerySurface(currentDisplay, currentSurface, EGL_HEIGHT, height)) {
 516             return false;
 517         }
 518
 519         return true;
 520     }
 521 #endif
 522
 523 #if defined(_WIN32)
 524
 525     HDC hDC = wglGetCurrentDC();
 526     if (!hDC) {
 527         return false;
 528     }
 529
 530     HWND hWnd = WindowFromDC(hDC);
 531     RECT rect;
 532
 533     if (!GetClientRect(hWnd, &rect)) {
 534        return false;
 535     }
 536
 537     *width  = rect.right  - rect.left;
 538     *height = rect.bottom - rect.top;
 539     return true;
 540
 541 #elif defined(__APPLE__)
 542
 543     CGLContextObj ctx = CGLGetCurrentContext();
 544     if (ctx == NULL) {
 545         return false;
 546     }
 547
 548     CGSConnectionID cid;
 549     CGSWindowID wid;
 550     CGSSurfaceID sid;
 551
 552     if (CGLGetSurface(ctx, &cid, &wid, &sid) != kCGLNoError) {
 553         return false;
 554     }
 555
 556     CGRect rect;
 557
 558     if (CGSGetSurfaceBounds(cid, wid, sid, &rect) != 0) {
 559         return false;
 560     }
 561
 562     *width = rect.size.width;
 563     *height = rect.size.height;
 564     return true;
 565
 566 #elif defined(HAVE_X11)
 567
 568     Display *display;
 569     Drawable drawable;
 570     Window root;
 571     int x, y;
 572     unsigned int w, h, bw, depth;
 573
 574     display = glXGetCurrentDisplay();
 575     if (!display) {
 576         return false;
 577     }
 578
 579     drawable = glXGetCurrentDrawable();
 580     if (drawable == None) {
 581         return false;
 582     }
 583
 584     if (!XGetGeometry(display, drawable, &root, &x, &y, &w, &h, &bw, &depth)) {
 585         return false;
 586     }
 587
 588     *width = w;
 589     *height = h;
 590     return true;
 591
 592 #else
 593
 594     return false;
 595
 596 #endif
 597 }
 598
 599
 600 static const GLenum texture_bindings[][2] = {
 601     {GL_TEXTURE_1D, GL_TEXTURE_BINDING_1D},
 602     {GL_TEXTURE_2D, GL_TEXTURE_BINDING_2D},
 603     {GL_TEXTURE_3D, GL_TEXTURE_BINDING_3D},
 604     {GL_TEXTURE_RECTANGLE, GL_TEXTURE_BINDING_RECTANGLE},
 605     {GL_TEXTURE_CUBE_MAP, GL_TEXTURE_BINDING_CUBE_MAP}
 606 };
 607
 608
 609 static bool
 610 bindTexture(GLint texture, GLenum &target, GLint &bound_texture)
 611 {
 612
 613     for (unsigned i = 0; i < sizeof(texture_bindings)/sizeof(texture_bindings[0]); ++i) {
 614         target  = texture_bindings[i][0];
 615
 616         GLenum binding = texture_bindings[i][1];
 617
 618         while (glGetError() != GL_NO_ERROR)
 619             ;
 620
 621         glGetIntegerv(binding, &bound_texture);
 622         glBindTexture(target, texture);
 623
 624         if (glGetError() == GL_NO_ERROR) {
 625             return true;
 626         }
 627
 628         glBindTexture(target, bound_texture);
 629     }
 630
 631     target = GL_NONE;
 632
 633     return false;
 634 }
 635
 636
 637 static bool
 638 getTextureLevelDesc(Context &context, GLint texture, GLint level, ImageDesc &desc)
 639 {
 640     GLenum target;
 641     GLint bound_texture = 0;
 642     if (!bindTexture(texture, target, bound_texture)) {
 643         return false;
 644     }
 645
 646     getActiveTextureLevelDesc(context, target, level, desc);
 647
 648     glBindTexture(target, bound_texture);
 649
 650     return desc.valid();
 651 }
 652
 653
 654 static bool
 655 getBoundRenderbufferDesc(Context &context, ImageDesc &desc)
 656 {
 657     glGetRenderbufferParameteriv(GL_RENDERBUFFER, GL_RENDERBUFFER_WIDTH, &desc.width);
 658     glGetRenderbufferParameteriv(GL_RENDERBUFFER, GL_RENDERBUFFER_HEIGHT, &desc.height);
 659     desc.depth = 1;
 660
 661     glGetRenderbufferParameteriv(GL_RENDERBUFFER, GL_RENDERBUFFER_INTERNAL_FORMAT, &desc.internalFormat);
 662
 663     return desc.valid();
 664 }
 665
 666
 667 static bool
 668 getRenderbufferDesc(Context &context, GLint renderbuffer, ImageDesc &desc)
 669 {
 670     GLint bound_renderbuffer = 0;
 671     glGetIntegerv(GL_RENDERBUFFER_BINDING, &bound_renderbuffer);
 672     glBindRenderbuffer(GL_RENDERBUFFER, renderbuffer);
 673
 674     getBoundRenderbufferDesc(context, desc);
 675
 676     glBindRenderbuffer(GL_RENDERBUFFER, bound_renderbuffer);
 677
 678     return desc.valid();
 679 }
 680
 681
 682 static bool
 683 getFramebufferAttachmentDesc(Context &context, GLenum target, GLenum attachment, ImageDesc &desc)
 684 {
 685     GLint object_type = GL_NONE;
 686     glGetFramebufferAttachmentParameteriv(target, attachment,
 687                                           GL_FRAMEBUFFER_ATTACHMENT_OBJECT_TYPE,
 688                                           &object_type);
 689     if (object_type == GL_NONE) {
 690         return false;
 691     }
 692
 693     GLint object_name = 0;
 694     glGetFramebufferAttachmentParameteriv(target, attachment,
 695                                           GL_FRAMEBUFFER_ATTACHMENT_OBJECT_NAME,
 696                                           &object_name);
 697     if (object_name == 0) {
 698         return false;
 699     }
 700
 701     if (object_type == GL_RENDERBUFFER) {
 702         return getRenderbufferDesc(context, object_name, desc);
 703     } else if (object_type == GL_TEXTURE) {
 704         GLint texture_level = 0;
 705         glGetFramebufferAttachmentParameteriv(target, attachment,
 706                                               GL_FRAMEBUFFER_ATTACHMENT_TEXTURE_LEVEL,
 707                                               &texture_level);
 708         return getTextureLevelDesc(context, object_name, texture_level, desc);
 709     } else {
 710         std::cerr << "warning: unexpected GL_FRAMEBUFFER_ATTACHMENT_OBJECT_TYPE = " << object_type << "\n";
 711         return false;
 712     }
 713 }
 714
 715
 716
 717 image::Image *
 718 getDrawBufferImage() {
 719     GLenum format = GL_RGB;
 720     GLint channels = _gl_format_channels(format);
 721     if (channels > 4) {
 722         return NULL;
 723     }
 724
 725     Context context;
 726
 727     GLenum framebuffer_binding;
 728     GLenum framebuffer_target;
 729     if (context.ES) {
 730         framebuffer_binding = GL_FRAMEBUFFER_BINDING;
 731         framebuffer_target = GL_FRAMEBUFFER;
 732     } else {
 733         framebuffer_binding = GL_DRAW_FRAMEBUFFER_BINDING;
 734         framebuffer_target = GL_DRAW_FRAMEBUFFER;
 735     }
 736
 737     GLint draw_framebuffer = 0;
 738     glGetIntegerv(framebuffer_binding, &draw_framebuffer);
 739
 740     GLint draw_buffer = GL_NONE;
 741     ImageDesc desc;
 742     if (draw_framebuffer) {
 743         if (context.ARB_draw_buffers) {
 744             glGetIntegerv(GL_DRAW_BUFFER0, &draw_buffer);
 745             if (draw_buffer == GL_NONE) {
 746                 return NULL;
 747             }
 748         } else {
 749             draw_buffer = GL_COLOR_ATTACHMENT0;
 750         }
 751
 752         if (!getFramebufferAttachmentDesc(context, framebuffer_target, draw_buffer, desc)) {
 753             return NULL;
 754         }
 755     } else {
 756         if (!context.ES) {
 757             glGetIntegerv(GL_DRAW_BUFFER, &draw_buffer);
 758             if (draw_buffer == GL_NONE) {
 759                 return NULL;
 760             }
 761         } else {
 762             draw_buffer = GL_COLOR_ATTACHMENT0;
 763         }
 764
 765         if (!getDrawableBounds(&desc.width, &desc.height)) {
 766             return NULL;
 767         }
 768
 769         desc.depth = 1;
 770     }
 771
 772     GLenum type = GL_UNSIGNED_BYTE;
 773
 774 #if DEPTH_AS_RGBA
 775     if (format == GL_DEPTH_COMPONENT) {
 776         type = GL_UNSIGNED_INT;
 777         channels = 4;
 778     }
 779 #endif
 780
 781     image::Image *image = new image::Image(desc.width, desc.height, channels, true);
 782     if (!image) {
 783         return NULL;
 784     }
 785
 786     while (glGetError() != GL_NO_ERROR) {}
 787
 788     GLint read_framebuffer = 0;
 789     GLint read_buffer = GL_NONE;
 790     if (!context.ES) {
 791         glGetIntegerv(GL_READ_FRAMEBUFFER_BINDING, &read_framebuffer);
 792         glBindFramebuffer(GL_READ_FRAMEBUFFER, draw_framebuffer);
 793
 794         glGetIntegerv(GL_READ_BUFFER, &read_buffer);
 795         glReadBuffer(draw_buffer);
 796     }
 797
 798     // TODO: reset imaging state too
 799     context.resetPixelPackState();
 800
 801     glReadPixels(0, 0, desc.width, desc.height, format, type, image->pixels);
 802
 803     context.restorePixelPackState();
 804
 805     if (!context.ES) {
 806         glReadBuffer(read_buffer);
 807         glBindFramebuffer(GL_READ_FRAMEBUFFER, read_framebuffer);
 808     }
 809
 810     GLenum error = glGetError();
 811     if (error != GL_NO_ERROR) {
 812         do {
 813             std::cerr << "warning: " << enumToString(error) << " while getting snapshot\n";
 814             error = glGetError();
 815         } while(error != GL_NO_ERROR);
 816         delete image;
 817         return NULL;
 818     }
 819
 820     return image;
 821 }
 822
 823
 824 /**
 825  * Dump the image of the currently bound read buffer.
 826  */
 827 static inline void
 828 dumpReadBufferImage(JSONWriter &json, GLint width, GLint height, GLenum format,
 829                     GLint internalFormat = GL_NONE)
 830 {
 831     GLint channels = _gl_format_channels(format);
 832
 833     if (internalFormat == GL_NONE) {
 834         internalFormat = format;
 835     }
 836
 837     Context context;
 838
 839     GLenum type = GL_UNSIGNED_BYTE;
 840
 841 #if DEPTH_AS_RGBA
 842     if (format == GL_DEPTH_COMPONENT) {
 843         type = GL_UNSIGNED_INT;
 844         channels = 4;
 845     }
 846 #endif
 847
 848     image::Image *image = new image::Image(width, height, channels, true);
 849
 850     // TODO: reset imaging state too
 851     context.resetPixelPackState();
 852
 853     glReadPixels(0, 0, width, height, format, type, image->pixels);
 854
 855     context.restorePixelPackState();
 856
 857     json.writeImage(image, formatToString(internalFormat));
 858
 859     delete image;
 860 }
 861
 862
 863 static inline GLuint
 864 downsampledFramebuffer(Context &context,
 865                        GLuint oldFbo, GLint drawbuffer,
 866                        GLint colorRb, GLint depthRb, GLint stencilRb,
 867                        GLuint *rbs, GLint *numRbs)
 868 {
 869     GLuint fbo;
 870
 871
 872     *numRbs = 0;
 873
 874     glGenFramebuffers(1, &fbo);
 875     glBindFramebuffer(GL_FRAMEBUFFER, fbo);
 876
 877     {
 878         // color buffer
 879         ImageDesc desc;
 880         glBindRenderbuffer(GL_RENDERBUFFER, colorRb);
 881         getBoundRenderbufferDesc(context, desc);
 882
 883         glGenRenderbuffers(1, &rbs[*numRbs]);
 884         glBindRenderbuffer(GL_RENDERBUFFER, rbs[*numRbs]);
 885         glRenderbufferStorage(GL_RENDERBUFFER, desc.internalFormat, desc.width, desc.height);
 886         glFramebufferRenderbuffer(GL_FRAMEBUFFER, drawbuffer,
 887                                   GL_RENDERBUFFER, rbs[*numRbs]);
 888
 889         glBindFramebuffer(GL_READ_FRAMEBUFFER, oldFbo);
 890         glBindFramebuffer(GL_DRAW_FRAMEBUFFER, fbo);
 891         glDrawBuffer(drawbuffer);
 892         glReadBuffer(drawbuffer);
 893         glBlitFramebuffer(0, 0, desc.width, desc.height, 0, 0, desc.width, desc.height,
 894                           GL_COLOR_BUFFER_BIT, GL_NEAREST);
 895         glBindFramebuffer(GL_FRAMEBUFFER, fbo);
 896         ++*numRbs;
 897     }
 898
 899     if (stencilRb == depthRb && stencilRb) {
 900         //combined depth and stencil buffer
 901         ImageDesc desc;
 902         glBindRenderbuffer(GL_RENDERBUFFER, depthRb);
 903         getBoundRenderbufferDesc(context, desc);
 904
 905         glGenRenderbuffers(1, &rbs[*numRbs]);
 906         glBindRenderbuffer(GL_RENDERBUFFER, rbs[*numRbs]);
 907         glRenderbufferStorage(GL_RENDERBUFFER, desc.internalFormat, desc.width, desc.height);
 908         glFramebufferRenderbuffer(GL_FRAMEBUFFER, GL_DEPTH_STENCIL_ATTACHMENT,
 909                                   GL_RENDERBUFFER, rbs[*numRbs]);
 910         glBindFramebuffer(GL_READ_FRAMEBUFFER, oldFbo);
 911         glBindFramebuffer(GL_DRAW_FRAMEBUFFER, fbo);
 912         glBlitFramebuffer(0, 0, desc.width, desc.height, 0, 0, desc.width, desc.height,
 913                           GL_DEPTH_BUFFER_BIT | GL_STENCIL_BUFFER_BIT, GL_NEAREST);
 914         glBindFramebuffer(GL_FRAMEBUFFER, fbo);
 915         ++*numRbs;
 916     } else {
 917         if (depthRb) {
 918             ImageDesc desc;
 919             glBindRenderbuffer(GL_RENDERBUFFER, depthRb);
 920             getBoundRenderbufferDesc(context, desc);
 921
 922             glGenRenderbuffers(1, &rbs[*numRbs]);
 923             glBindRenderbuffer(GL_RENDERBUFFER, rbs[*numRbs]);
 924             glRenderbufferStorage(GL_RENDERBUFFER, desc.internalFormat, desc.width, desc.height);
 925             glFramebufferRenderbuffer(GL_FRAMEBUFFER,
 926                                       GL_DEPTH_ATTACHMENT,
 927                                       GL_RENDERBUFFER, rbs[*numRbs]);
 928             glBindFramebuffer(GL_READ_FRAMEBUFFER, oldFbo);
 929             glBindFramebuffer(GL_DRAW_FRAMEBUFFER, fbo);
 930             glDrawBuffer(GL_DEPTH_ATTACHMENT);
 931             glReadBuffer(GL_DEPTH_ATTACHMENT);
 932             glBlitFramebuffer(0, 0, desc.width, desc.height, 0, 0, desc.width, desc.height,
 933                               GL_DEPTH_BUFFER_BIT, GL_NEAREST);
 934             ++*numRbs;
 935         }
 936         if (stencilRb) {
 937             ImageDesc desc;
 938             glBindRenderbuffer(GL_RENDERBUFFER, stencilRb);
 939             getBoundRenderbufferDesc(context, desc);
 940
 941             glGenRenderbuffers(1, &rbs[*numRbs]);
 942             glBindRenderbuffer(GL_RENDERBUFFER, rbs[*numRbs]);
 943             glRenderbufferStorage(GL_RENDERBUFFER, desc.internalFormat, desc.width, desc.height);
 944             glFramebufferRenderbuffer(GL_FRAMEBUFFER,
 945                                       GL_STENCIL_ATTACHMENT,
 946                                       GL_RENDERBUFFER, rbs[*numRbs]);
 947             glBindFramebuffer(GL_READ_FRAMEBUFFER, oldFbo);
 948             glBindFramebuffer(GL_DRAW_FRAMEBUFFER, fbo);
 949             glDrawBuffer(GL_STENCIL_ATTACHMENT);
 950             glReadBuffer(GL_STENCIL_ATTACHMENT);
 951             glBlitFramebuffer(0, 0, desc.width, desc.height, 0, 0, desc.width, desc.height,
 952                               GL_STENCIL_BUFFER_BIT, GL_NEAREST);
 953             ++*numRbs;
 954         }
 955     }
 956
 957     return fbo;
 958 }
 959
 960
 961 /**
 962  * Dump images of current draw drawable/window.
 963  */
 964 static void
 965 dumpDrawableImages(JSONWriter &json, Context &context)
 966 {
 967     GLint width, height;
 968
 969     if (!getDrawableBounds(&width, &height)) {
 970         return;
 971     }
 972
 973     GLint draw_buffer = GL_NONE;
 974     if (context.ES) {
 975         draw_buffer = GL_BACK;
 976     } else {
 977         glGetIntegerv(GL_DRAW_BUFFER, &draw_buffer);
 978         glReadBuffer(draw_buffer);
 979     }
 980
 981     if (draw_buffer != GL_NONE) {
 982         GLint read_buffer = GL_NONE;
 983         if (!context.ES) {
 984             glGetIntegerv(GL_READ_BUFFER, &read_buffer);
 985         }
 986
 987         GLint alpha_bits = 0;
 988 #if 0
 989         // XXX: Ignore alpha until we are able to match the traced visual
 990         glGetIntegerv(GL_ALPHA_BITS, &alpha_bits);
 991 #endif
 992         GLenum format = alpha_bits ? GL_RGBA : GL_RGB;
 993         json.beginMember(enumToString(draw_buffer));
 994         dumpReadBufferImage(json, width, height, format);
 995         json.endMember();
 996
 997         if (!context.ES) {
 998             glReadBuffer(read_buffer);
 999         }
1000     }
1001
1002     if (!context.ES) {
1003         GLint depth_bits = 0;
1004         glGetIntegerv(GL_DEPTH_BITS, &depth_bits);
1005         if (depth_bits) {
1006             json.beginMember("GL_DEPTH_COMPONENT");
1007             dumpReadBufferImage(json, width, height, GL_DEPTH_COMPONENT);
1008             json.endMember();
1009         }
1010
1011         GLint stencil_bits = 0;
1012         glGetIntegerv(GL_STENCIL_BITS, &stencil_bits);
1013         if (stencil_bits) {
1014             json.beginMember("GL_STENCIL_INDEX");
1015             dumpReadBufferImage(json, width, height, GL_STENCIL_INDEX);
1016             json.endMember();
1017         }
1018     }
1019 }
1020
1021
1022 /**
1023  * Dump the specified framebuffer attachment.
1024  *
1025  * In the case of a color attachment, it assumes it is already bound for read.
1026  */
1027 static void
1028 dumpFramebufferAttachment(JSONWriter &json, Context &context, GLenum target, GLenum attachment, GLenum format)
1029 {
1030     ImageDesc desc;
1031     if (!getFramebufferAttachmentDesc(context, target, attachment, desc)) {
1032         return;
1033     }
1034
1035     json.beginMember(enumToString(attachment));
1036     dumpReadBufferImage(json, desc.width, desc.height, format, desc.internalFormat);
1037     json.endMember();
1038 }
1039
1040
1041 static void
1042 dumpFramebufferAttachments(JSONWriter &json, Context &context, GLenum target)
1043 {
1044     GLint read_framebuffer = 0;
1045     glGetIntegerv(GL_READ_FRAMEBUFFER_BINDING, &read_framebuffer);
1046
1047     GLint read_buffer = GL_NONE;
1048     glGetIntegerv(GL_READ_BUFFER, &read_buffer);
1049
1050     GLint max_draw_buffers = 1;
1051     glGetIntegerv(GL_MAX_DRAW_BUFFERS, &max_draw_buffers);
1052     GLint max_color_attachments = 0;
1053     glGetIntegerv(GL_MAX_COLOR_ATTACHMENTS, &max_color_attachments);
1054
1055     for (GLint i = 0; i < max_draw_buffers; ++i) {
1056         GLint draw_buffer = GL_NONE;
1057         glGetIntegerv(GL_DRAW_BUFFER0 + i, &draw_buffer);
1058         if (draw_buffer != GL_NONE) {
1059             glReadBuffer(draw_buffer);
1060             GLint attachment;
1061             if (draw_buffer >= GL_COLOR_ATTACHMENT0 && draw_buffer < GL_COLOR_ATTACHMENT0 + max_color_attachments) {
1062                 attachment = draw_buffer;
1063             } else {
1064                 std::cerr << "warning: unexpected GL_DRAW_BUFFER" << i << " = " << draw_buffer << "\n";
1065                 attachment = GL_COLOR_ATTACHMENT0;
1066             }
1067             GLint alpha_size = 0;
1068             glGetFramebufferAttachmentParameteriv(target, attachment,
1069                                                   GL_FRAMEBUFFER_ATTACHMENT_ALPHA_SIZE,
1070                                                   &alpha_size);
1071             GLenum format = alpha_size ? GL_RGBA : GL_RGB;
1072             dumpFramebufferAttachment(json, context, target, attachment, format);
1073         }
1074     }
1075
1076     glReadBuffer(read_buffer);
1077
1078     if (!context.ES) {
1079         dumpFramebufferAttachment(json, context, target, GL_DEPTH_ATTACHMENT, GL_DEPTH_COMPONENT);
1080         dumpFramebufferAttachment(json, context, target, GL_STENCIL_ATTACHMENT, GL_STENCIL_INDEX);
1081     }
1082
1083     glBindFramebuffer(GL_READ_FRAMEBUFFER, read_framebuffer);
1084 }
1085
1086
1087 void
1088 dumpFramebuffer(JSONWriter &json, Context &context)
1089 {
1090     json.beginMember("framebuffer");
1091     json.beginObject();
1092
1093     GLint boundDrawFbo = 0, boundReadFbo = 0;
1094     glGetIntegerv(GL_DRAW_FRAMEBUFFER_BINDING, &boundDrawFbo);
1095     glGetIntegerv(GL_READ_FRAMEBUFFER_BINDING, &boundReadFbo);
1096     if (!boundDrawFbo) {
1097         dumpDrawableImages(json, context);
1098     } else if (context.ES) {
1099         dumpFramebufferAttachments(json, context, GL_FRAMEBUFFER);
1100     } else {
1101         GLint colorRb = 0, stencilRb = 0, depthRb = 0;
1102         GLint draw_buffer0 = GL_NONE;
1103         glGetIntegerv(GL_DRAW_BUFFER0, &draw_buffer0);
1104         bool multisample = false;
1105
1106         GLint boundRb = 0;
1107         glGetIntegerv(GL_RENDERBUFFER_BINDING, &boundRb);
1108
1109         GLint object_type;
1110         glGetFramebufferAttachmentParameteriv(GL_DRAW_FRAMEBUFFER, draw_buffer0, GL_FRAMEBUFFER_ATTACHMENT_OBJECT_TYPE, &object_type);
1111         if (object_type == GL_RENDERBUFFER) {
1112             glGetFramebufferAttachmentParameteriv(GL_DRAW_FRAMEBUFFER, draw_buffer0, GL_FRAMEBUFFER_ATTACHMENT_OBJECT_NAME, &colorRb);
1113             glBindRenderbuffer(GL_RENDERBUFFER, colorRb);
1114             GLint samples = 0;
1115             glGetRenderbufferParameteriv(GL_RENDERBUFFER, GL_RENDERBUFFER_SAMPLES, &samples);
1116             if (samples) {
1117                 multisample = true;
1118             }
1119         }
1120
1121         glGetFramebufferAttachmentParameteriv(GL_DRAW_FRAMEBUFFER, GL_DEPTH_ATTACHMENT, GL_FRAMEBUFFER_ATTACHMENT_OBJECT_TYPE, &object_type);
1122         if (object_type == GL_RENDERBUFFER) {
1123             glGetFramebufferAttachmentParameteriv(GL_DRAW_FRAMEBUFFER, GL_DEPTH_ATTACHMENT, GL_FRAMEBUFFER_ATTACHMENT_OBJECT_NAME, &depthRb);
1124             glBindRenderbuffer(GL_RENDERBUFFER, depthRb);
1125             GLint samples = 0;
1126             glGetRenderbufferParameteriv(GL_RENDERBUFFER, GL_RENDERBUFFER_SAMPLES, &samples);
1127             if (samples) {
1128                 multisample = true;
1129             }
1130         }
1131
1132         glGetFramebufferAttachmentParameteriv(GL_DRAW_FRAMEBUFFER, GL_STENCIL_ATTACHMENT, GL_FRAMEBUFFER_ATTACHMENT_OBJECT_TYPE, &object_type);
1133         if (object_type == GL_RENDERBUFFER) {
1134             glGetFramebufferAttachmentParameteriv(GL_DRAW_FRAMEBUFFER, GL_STENCIL_ATTACHMENT, GL_FRAMEBUFFER_ATTACHMENT_OBJECT_NAME, &stencilRb);
1135             glBindRenderbuffer(GL_RENDERBUFFER, stencilRb);
1136             GLint samples = 0;
1137             glGetRenderbufferParameteriv(GL_RENDERBUFFER, GL_RENDERBUFFER_SAMPLES, &samples);
1138             if (samples) {
1139                 multisample = true;
1140             }
1141         }
1142
1143         glBindRenderbuffer(GL_RENDERBUFFER, boundRb);
1144
1145         GLuint rbs[3];
1146         GLint numRbs = 0;
1147         GLuint fboCopy = 0;
1148
1149         if (multisample) {
1150             // glReadPixels doesnt support multisampled buffers so we need
1151             // to blit the fbo to a temporary one
1152             fboCopy = downsampledFramebuffer(context,
1153                                              boundDrawFbo, draw_buffer0,
1154                                              colorRb, depthRb, stencilRb,
1155                                              rbs, &numRbs);
1156         }
1157
1158         dumpFramebufferAttachments(json, context, GL_DRAW_FRAMEBUFFER);
1159
1160         if (multisample) {
1161             glBindRenderbuffer(GL_RENDERBUFFER_BINDING, boundRb);
1162             glDeleteRenderbuffers(numRbs, rbs);
1163             glDeleteFramebuffers(1, &fboCopy);
1164         }
1165
1166         glBindFramebuffer(GL_READ_FRAMEBUFFER, boundReadFbo);
1167         glBindFramebuffer(GL_DRAW_FRAMEBUFFER, boundDrawFbo);
1168     }
1169
1170     json.endObject();
1171     json.endMember(); // framebuffer
1172 }
1173
1174
1175 } /* namespace glstate */