git.cworth.org Git - apitrace/blob - glstate.cpp

   1 /**************************************************************************
   2  *
   3  * Copyright 2011 Jose Fonseca
   4  * All Rights Reserved.
   5  *
   6  * Permission is hereby granted, free of charge, to any person obtaining a copy
   7  * of this software and associated documentation files (the "Software"), to deal
   8  * in the Software without restriction, including without limitation the rights
   9  * to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
  10  * copies of the Software, and to permit persons to whom the Software is
  11  * furnished to do so, subject to the following conditions:
  12  *
  13  * The above copyright notice and this permission notice shall be included in
  14  * all copies or substantial portions of the Software.
  15  *
  16  * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
  17  * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
  18  * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
  19  * AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
  20  * LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
  21  * OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN
  22  * THE SOFTWARE.
  23  *
  24  **************************************************************************/
  25
  26
  27 #include <string.h>
  28 #include <iostream>
  29 #include <algorithm>
  30
  31 #include "image.hpp"
  32 #include "json.hpp"
  33 #include "glproc.hpp"
  34 #include "glsize.hpp"
  35 #include "glstate.hpp"
  36
  37
  38 #ifdef __APPLE__
  39
  40 #include <Carbon/Carbon.h>
  41
  42 #ifdef __cplusplus
  43 extern "C" {
  44 #endif
  45
  46 OSStatus CGSGetSurfaceBounds(CGSConnectionID, CGWindowID, CGSSurfaceID, CGRect *);
  47
  48 #ifdef __cplusplus
  49 }
  50 #endif
  51
  52 #endif /* __APPLE__ */
  53
  54
  55 namespace glstate {
  56
  57
  58 static inline void
  59 resetPixelPackState(void) {
  60     glPushClientAttrib(GL_CLIENT_PIXEL_STORE_BIT);
  61     glPixelStorei(GL_PACK_SWAP_BYTES, GL_FALSE);
  62     glPixelStorei(GL_PACK_LSB_FIRST, GL_FALSE);
  63     glPixelStorei(GL_PACK_ROW_LENGTH, 0);
  64     glPixelStorei(GL_PACK_IMAGE_HEIGHT, 0);
  65     glPixelStorei(GL_PACK_SKIP_ROWS, 0);
  66     glPixelStorei(GL_PACK_SKIP_PIXELS, 0);
  67     glPixelStorei(GL_PACK_SKIP_IMAGES, 0);
  68     glPixelStorei(GL_PACK_ALIGNMENT, 1);
  69     glBindBuffer(GL_PIXEL_PACK_BUFFER, 0);
  70 }
  71
  72
  73 static inline void
  74 restorePixelPackState(void) {
  75     glPopClientAttrib();
  76 }
  77
  78
  79 static void
  80 dumpShader(JSONWriter &json, GLuint shader)
  81 {
  82     if (!shader) {
  83         return;
  84     }
  85
  86     GLint shader_type = 0;
  87     glGetShaderiv(shader, GL_SHADER_TYPE, &shader_type);
  88     if (!shader_type) {
  89         return;
  90     }
  91
  92     GLint source_length = 0;
  93     glGetShaderiv(shader, GL_SHADER_SOURCE_LENGTH, &source_length);
  94     if (!source_length) {
  95         return;
  96     }
  97
  98     GLchar *source = new GLchar[source_length];
  99     GLsizei length = 0;
 100     source[0] = 0;
 101     glGetShaderSource(shader, source_length, &length, source);
 102
 103     json.beginMember(enumToString(shader_type));
 104     json.writeString(source);
 105     json.endMember();
 106
 107     delete [] source;
 108 }
 109
 110
 111 static void
 112 dumpShaderObj(JSONWriter &json, GLhandleARB shaderObj)
 113 {
 114     if (!shaderObj) {
 115         return;
 116     }
 117
 118     GLint shader_type = 0;
 119     glGetObjectParameterivARB(shaderObj, GL_OBJECT_TYPE_ARB, &shader_type);
 120     if (!shader_type) {
 121         return;
 122     }
 123
 124     GLint source_length = 0;
 125     glGetObjectParameterivARB(shaderObj, GL_OBJECT_SHADER_SOURCE_LENGTH_ARB, &source_length);
 126     if (!source_length) {
 127         return;
 128     }
 129
 130     GLcharARB *source = new GLcharARB[source_length];
 131     GLsizei length = 0;
 132     source[0] = 0;
 133     glGetShaderSource(shaderObj, source_length, &length, source);
 134
 135     json.beginMember(enumToString(shader_type));
 136     json.writeString(source);
 137     json.endMember();
 138
 139     delete [] source;
 140 }
 141
 142
 143 static inline void
 144 dumpCurrentProgram(JSONWriter &json)
 145 {
 146     GLint program = 0;
 147     glGetIntegerv(GL_CURRENT_PROGRAM, &program);
 148     if (!program) {
 149         return;
 150     }
 151
 152     GLint attached_shaders = 0;
 153     glGetProgramiv(program, GL_ATTACHED_SHADERS, &attached_shaders);
 154     if (!attached_shaders) {
 155         return;
 156     }
 157
 158     GLuint *shaders = new GLuint[attached_shaders];
 159     GLsizei count = 0;
 160     glGetAttachedShaders(program, attached_shaders, &count, shaders);
 161     for (GLsizei i = 0; i < count; ++ i) {
 162        dumpShader(json, shaders[i]);
 163     }
 164     delete [] shaders;
 165 }
 166
 167
 168 static inline void
 169 dumpCurrentProgramObj(JSONWriter &json)
 170 {
 171     GLhandleARB programObj = glGetHandleARB(GL_PROGRAM_OBJECT_ARB);
 172     if (!programObj) {
 173         return;
 174     }
 175
 176     GLint attached_shaders = 0;
 177     glGetProgramivARB(programObj, GL_OBJECT_ATTACHED_OBJECTS_ARB, &attached_shaders);
 178     if (!attached_shaders) {
 179         return;
 180     }
 181
 182     GLhandleARB *shaderObjs = new GLhandleARB[attached_shaders];
 183     GLsizei count = 0;
 184     glGetAttachedObjectsARB(programObj, attached_shaders, &count, shaderObjs);
 185     for (GLsizei i = 0; i < count; ++ i) {
 186        dumpShaderObj(json, shaderObjs[i]);
 187     }
 188     delete [] shaderObjs;
 189 }
 190
 191
 192 static inline void
 193 dumpArbProgram(JSONWriter &json, GLenum target)
 194 {
 195     if (!glIsEnabled(target)) {
 196         return;
 197     }
 198
 199     GLint program_length = 0;
 200     glGetProgramivARB(target, GL_PROGRAM_LENGTH_ARB, &program_length);
 201     if (!program_length) {
 202         return;
 203     }
 204
 205     GLchar *source = new GLchar[program_length + 1];
 206     source[0] = 0;
 207     glGetProgramStringARB(target, GL_PROGRAM_STRING_ARB, source);
 208     source[program_length] = 0;
 209
 210     json.beginMember(enumToString(target));
 211     json.writeString(source);
 212     json.endMember();
 213
 214     delete [] source;
 215 }
 216
 217
 218 static inline void
 219 dumpShaders(JSONWriter &json)
 220 {
 221     json.beginMember("shaders");
 222     json.beginObject();
 223     dumpCurrentProgram(json);
 224     dumpArbProgram(json, GL_FRAGMENT_PROGRAM_ARB);
 225     dumpArbProgram(json, GL_VERTEX_PROGRAM_ARB);
 226     json.endObject();
 227     json.endMember(); //shaders
 228 }
 229
 230
 231 static inline void
 232 dumpTextureImage(JSONWriter &json, GLenum target, GLint level)
 233 {
 234     GLint width, height = 1, depth = 1;
 235
 236     width = 0;
 237     glGetTexLevelParameteriv(target, level, GL_TEXTURE_WIDTH, &width);
 238
 239     if (target != GL_TEXTURE_1D) {
 240         height = 0;
 241         glGetTexLevelParameteriv(target, level, GL_TEXTURE_HEIGHT, &height);
 242         if (target == GL_TEXTURE_3D) {
 243             depth = 0;
 244             glGetTexLevelParameteriv(target, level, GL_TEXTURE_DEPTH, &depth);
 245         }
 246     }
 247
 248     if (width <= 0 || height <= 0 || depth <= 0) {
 249         return;
 250     } else {
 251         char label[512];
 252
 253         GLint active_texture = GL_TEXTURE0;
 254         glGetIntegerv(GL_ACTIVE_TEXTURE, &active_texture);
 255         snprintf(label, sizeof label, "%s, %s, level = %i", enumToString(active_texture), enumToString(target), level);
 256
 257         json.beginMember(label);
 258
 259         json.beginObject();
 260
 261         // Tell the GUI this is no ordinary object, but an image
 262         json.writeStringMember("__class__", "image");
 263
 264         json.writeNumberMember("__width__", width);
 265         json.writeNumberMember("__height__", height);
 266         json.writeNumberMember("__depth__", depth);
 267
 268         // Hardcoded for now, but we could chose types more adequate to the
 269         // texture internal format
 270         json.writeStringMember("__type__", "uint8");
 271         json.writeBoolMember("__normalized__", true);
 272         json.writeNumberMember("__channels__", 4);
 273
 274         GLubyte *pixels = new GLubyte[depth*width*height*4];
 275
 276         resetPixelPackState();
 277
 278         glGetTexImage(target, level, GL_RGBA, GL_UNSIGNED_BYTE, pixels);
 279
 280         restorePixelPackState();
 281
 282         json.beginMember("__data__");
 283         char *pngBuffer;
 284         int pngBufferSize;
 285         Image::writePixelsToBuffer(pixels, width, height, 4, false, &pngBuffer, &pngBufferSize);
 286         json.writeBase64(pngBuffer, pngBufferSize);
 287         free(pngBuffer);
 288         json.endMember(); // __data__
 289
 290         delete [] pixels;
 291         json.endObject();
 292     }
 293 }
 294
 295
 296 static inline void
 297 dumpTexture(JSONWriter &json, GLenum target, GLenum binding)
 298 {
 299     GLint texture_binding = 0;
 300     glGetIntegerv(binding, &texture_binding);
 301     if (!glIsEnabled(target) && !texture_binding) {
 302         return;
 303     }
 304
 305     GLint level = 0;
 306     do {
 307         GLint width = 0, height = 0;
 308         glGetTexLevelParameteriv(target, level, GL_TEXTURE_WIDTH, &width);
 309         glGetTexLevelParameteriv(target, level, GL_TEXTURE_HEIGHT, &height);
 310         if (!width || !height) {
 311             break;
 312         }
 313
 314         if (target == GL_TEXTURE_CUBE_MAP) {
 315             for (int face = 0; face < 6; ++face) {
 316                 dumpTextureImage(json, GL_TEXTURE_CUBE_MAP_POSITIVE_X + face, level);
 317             }
 318         } else {
 319             dumpTextureImage(json, target, level);
 320         }
 321
 322         ++level;
 323     } while(true);
 324 }
 325
 326
 327 static inline void
 328 dumpTextures(JSONWriter &json)
 329 {
 330     json.beginMember("textures");
 331     json.beginObject();
 332     GLint active_texture = GL_TEXTURE0;
 333     glGetIntegerv(GL_ACTIVE_TEXTURE, &active_texture);
 334     GLint max_texture_coords = 0;
 335     glGetIntegerv(GL_MAX_TEXTURE_COORDS, &max_texture_coords);
 336     GLint max_combined_texture_image_units = 0;
 337     glGetIntegerv(GL_MAX_COMBINED_TEXTURE_IMAGE_UNITS, &max_combined_texture_image_units);
 338     GLint max_units = std::max(max_combined_texture_image_units, max_texture_coords);
 339     for (GLint unit = 0; unit < max_units; ++unit) {
 340         GLenum texture = GL_TEXTURE0 + unit;
 341         glActiveTexture(texture);
 342         dumpTexture(json, GL_TEXTURE_1D, GL_TEXTURE_BINDING_1D);
 343         dumpTexture(json, GL_TEXTURE_2D, GL_TEXTURE_BINDING_2D);
 344         dumpTexture(json, GL_TEXTURE_3D, GL_TEXTURE_BINDING_3D);
 345         dumpTexture(json, GL_TEXTURE_RECTANGLE, GL_TEXTURE_BINDING_RECTANGLE);
 346         dumpTexture(json, GL_TEXTURE_CUBE_MAP, GL_TEXTURE_BINDING_CUBE_MAP);
 347     }
 348     glActiveTexture(active_texture);
 349     json.endObject();
 350     json.endMember(); // textures
 351 }
 352
 353
 354 static bool
 355 getDrawableBounds(GLint *width, GLint *height) {
 356 #if defined(_WIN32)
 357
 358     HDC hDC = wglGetCurrentDC();
 359     if (!hDC) {
 360         return false;
 361     }
 362
 363     HWND hWnd = WindowFromDC(hDC);
 364     RECT rect;
 365
 366     if (!GetClientRect(hWnd, &rect)) {
 367        return false;
 368     }
 369
 370     *width  = rect.right  - rect.left;
 371     *height = rect.bottom - rect.top;
 372
 373 #elif defined(__APPLE__)
 374
 375     CGLContextObj ctx = CGLGetCurrentContext();
 376     if (ctx == NULL) {
 377         return false;
 378     }
 379
 380     CGSConnectionID cid;
 381     CGSWindowID wid;
 382     CGSSurfaceID sid;
 383
 384     if (CGLGetSurface(ctx, &cid, &wid, &sid) != kCGLNoError) {
 385         return false;
 386     }
 387
 388     CGRect rect;
 389
 390     if (CGSGetSurfaceBounds(cid, wid, sid, &rect) != 0) {
 391         return false;
 392     }
 393
 394     *width = rect.size.width;
 395     *height = rect.size.height;
 396
 397 #else
 398
 399     Display *display;
 400     Drawable drawable;
 401     Window root;
 402     int x, y;
 403     unsigned int w, h, bw, depth;
 404
 405     display = glXGetCurrentDisplay();
 406     if (!display) {
 407         return false;
 408     }
 409
 410     drawable = glXGetCurrentDrawable();
 411     if (drawable == None) {
 412         return false;
 413     }
 414
 415     if (!XGetGeometry(display, drawable, &root, &x, &y, &w, &h, &bw, &depth)) {
 416         return false;
 417     }
 418
 419     *width = w;
 420     *height = h;
 421
 422 #endif
 423
 424     return true;
 425 }
 426
 427
 428 static const GLenum texture_bindings[][2] = {
 429     {GL_TEXTURE_1D, GL_TEXTURE_BINDING_1D},
 430     {GL_TEXTURE_2D, GL_TEXTURE_BINDING_2D},
 431     {GL_TEXTURE_3D, GL_TEXTURE_BINDING_3D},
 432     {GL_TEXTURE_RECTANGLE, GL_TEXTURE_BINDING_RECTANGLE},
 433     {GL_TEXTURE_CUBE_MAP, GL_TEXTURE_BINDING_CUBE_MAP}
 434 };
 435
 436
 437 static bool
 438 bindTexture(GLint texture, GLenum &target, GLint &bound_texture)
 439 {
 440
 441     for (unsigned i = 0; i < sizeof(texture_bindings)/sizeof(texture_bindings[0]); ++i) {
 442         target  = texture_bindings[i][0];
 443
 444         GLenum binding = texture_bindings[i][1];
 445
 446         while (glGetError() != GL_NO_ERROR)
 447             ;
 448
 449         glGetIntegerv(binding, &bound_texture);
 450         glBindTexture(target, texture);
 451
 452         if (glGetError() == GL_NO_ERROR) {
 453             return true;
 454         }
 455
 456         glBindTexture(target, bound_texture);
 457     }
 458
 459     target = GL_NONE;
 460
 461     return false;
 462 }
 463
 464
 465 static bool
 466 getTextureLevelSize(GLint texture, GLint level, GLint *width, GLint *height)
 467 {
 468     *width = 0;
 469     *height = 0;
 470
 471     GLenum target;
 472     GLint bound_texture = 0;
 473     if (!bindTexture(texture, target, bound_texture)) {
 474         return false;
 475     }
 476
 477     glGetTexLevelParameteriv(target, level, GL_TEXTURE_WIDTH, width);
 478     glGetTexLevelParameteriv(target, level, GL_TEXTURE_HEIGHT, height);
 479
 480     glBindTexture(target, bound_texture);
 481
 482     return *width > 0 && *height > 0;
 483 }
 484
 485
 486 static bool
 487 getRenderbufferSize(GLint renderbuffer, GLint *width, GLint *height)
 488 {
 489     GLint bound_renderbuffer = 0;
 490     glGetIntegerv(GL_RENDERBUFFER_BINDING, &bound_renderbuffer);
 491     glBindRenderbuffer(GL_RENDERBUFFER, renderbuffer);
 492
 493     *width = 0;
 494     *height = 0;
 495     glGetRenderbufferParameteriv(GL_RENDERBUFFER, GL_RENDERBUFFER_WIDTH, width);
 496     glGetRenderbufferParameteriv(GL_RENDERBUFFER, GL_RENDERBUFFER_HEIGHT, height);
 497
 498     glBindRenderbuffer(GL_RENDERBUFFER, bound_renderbuffer);
 499
 500     return *width > 0 && *height > 0;
 501 }
 502
 503
 504 static bool
 505 getFramebufferAttachmentSize(GLenum target, GLenum attachment, GLint *width, GLint *height)
 506 {
 507     GLint object_type = GL_NONE;
 508     glGetFramebufferAttachmentParameteriv(target, attachment,
 509                                           GL_FRAMEBUFFER_ATTACHMENT_OBJECT_TYPE,
 510                                           &object_type);
 511     if (object_type == GL_NONE) {
 512         return false;
 513     }
 514
 515     GLint object_name = 0;
 516     glGetFramebufferAttachmentParameteriv(target, attachment,
 517                                           GL_FRAMEBUFFER_ATTACHMENT_OBJECT_NAME,
 518                                           &object_name);
 519     if (object_name == 0) {
 520         return false;
 521     }
 522
 523     if (object_type == GL_RENDERBUFFER) {
 524         return getRenderbufferSize(object_name, width, height);
 525     } else if (object_type == GL_TEXTURE) {
 526         GLint texture_level = 0;
 527         glGetFramebufferAttachmentParameteriv(target, attachment,
 528                                               GL_FRAMEBUFFER_ATTACHMENT_TEXTURE_LEVEL,
 529                                               &texture_level);
 530         return getTextureLevelSize(object_name, texture_level, width, height);
 531     } else {
 532         std::cerr << "warning: unexpected GL_FRAMEBUFFER_ATTACHMENT_OBJECT_TYPE = " << object_type << "\n";
 533         return false;
 534     }
 535 }
 536
 537
 538 Image::Image *
 539 getDrawBufferImage(GLenum format) {
 540     GLint channels = __gl_format_channels(format);
 541     if (channels > 4) {
 542         return NULL;
 543     }
 544
 545     GLint draw_framebuffer = 0;
 546     glGetIntegerv(GL_DRAW_FRAMEBUFFER_BINDING, &draw_framebuffer);
 547
 548     GLint draw_buffer = GL_NONE;
 549     GLint width, height;
 550     if (draw_framebuffer) {
 551         glGetIntegerv(GL_DRAW_BUFFER0, &draw_buffer);
 552         if (draw_buffer == GL_NONE) {
 553             return NULL;
 554         }
 555
 556         if (!getFramebufferAttachmentSize(GL_DRAW_FRAMEBUFFER, draw_buffer, &width, &height)) {
 557             return NULL;
 558         }
 559     } else {
 560         glGetIntegerv(GL_DRAW_BUFFER, &draw_buffer);
 561         if (draw_buffer == GL_NONE) {
 562             return NULL;
 563         }
 564
 565         if (!getDrawableBounds(&width, &height)) {
 566             return NULL;
 567         }
 568     }
 569
 570     Image::Image *image = new Image::Image(width, height, channels, true);
 571     if (!image) {
 572         return NULL;
 573     }
 574
 575     while (glGetError() != GL_NO_ERROR) {}
 576
 577     GLint read_framebuffer = 0;
 578     glGetIntegerv(GL_READ_FRAMEBUFFER_BINDING, &read_framebuffer);
 579     glBindFramebuffer(GL_READ_FRAMEBUFFER, draw_framebuffer);
 580
 581     GLint read_buffer = 0;
 582     glGetIntegerv(GL_READ_BUFFER, &read_buffer);
 583     glReadBuffer(draw_buffer);
 584
 585     // TODO: reset imaging state too
 586     resetPixelPackState();
 587
 588     glReadPixels(0, 0, width, height, format, GL_UNSIGNED_BYTE, image->pixels);
 589
 590     restorePixelPackState();
 591     glReadBuffer(read_buffer);
 592     glBindFramebuffer(GL_READ_FRAMEBUFFER, read_framebuffer);
 593
 594     GLenum error = glGetError();
 595     if (error != GL_NO_ERROR) {
 596         do {
 597             std::cerr << "warning: " << enumToString(error) << " while getting snapshot\n";
 598             error = glGetError();
 599         } while(error != GL_NO_ERROR);
 600         delete image;
 601         return NULL;
 602     }
 603
 604     return image;
 605 }
 606
 607
 608 /**
 609  * Dump the image of the currently bound read buffer.
 610  */
 611 static inline void
 612 dumpReadBufferImage(JSONWriter &json, GLint width, GLint height, GLenum format)
 613 {
 614     GLint channels = __gl_format_channels(format);
 615
 616     json.beginObject();
 617
 618     // Tell the GUI this is no ordinary object, but an image
 619     json.writeStringMember("__class__", "image");
 620
 621     json.writeNumberMember("__width__", width);
 622     json.writeNumberMember("__height__", height);
 623     json.writeNumberMember("__depth__", 1);
 624
 625     // Hardcoded for now, but we could chose types more adequate to the
 626     // texture internal format
 627     json.writeStringMember("__type__", "uint8");
 628     json.writeBoolMember("__normalized__", true);
 629     json.writeNumberMember("__channels__", channels);
 630
 631     GLubyte *pixels = new GLubyte[width*height*channels];
 632
 633     // TODO: reset imaging state too
 634     resetPixelPackState();
 635
 636     glReadPixels(0, 0, width, height, format, GL_UNSIGNED_BYTE, pixels);
 637
 638     restorePixelPackState();
 639
 640     json.beginMember("__data__");
 641     char *pngBuffer;
 642     int pngBufferSize;
 643     Image::writePixelsToBuffer(pixels, width, height, channels, false, &pngBuffer, &pngBufferSize);
 644     //std::cerr <<" Before = "<<(width * height * channels * sizeof *pixels)
 645     //          <<", after = "<<pngBufferSize << ", ratio = " << double(width * height * channels * sizeof *pixels)/pngBufferSize;
 646     json.writeBase64(pngBuffer, pngBufferSize);
 647     free(pngBuffer);
 648     json.endMember(); // __data__
 649
 650     delete [] pixels;
 651     json.endObject();
 652 }
 653
 654
 655 static inline GLuint
 656 downsampledFramebuffer(GLuint oldFbo, GLint drawbuffer,
 657                        GLint colorRb, GLint depthRb, GLint stencilRb,
 658                        GLuint *rbs, GLint *numRbs)
 659 {
 660     GLuint fbo;
 661     GLint format;
 662     GLint w, h;
 663
 664     *numRbs = 0;
 665
 666     glGenFramebuffers(1, &fbo);
 667     glBindFramebuffer(GL_FRAMEBUFFER, fbo);
 668
 669     glBindRenderbuffer(GL_RENDERBUFFER, colorRb);
 670     glGetRenderbufferParameteriv(GL_RENDERBUFFER,
 671                                  GL_RENDERBUFFER_WIDTH, &w);
 672     glGetRenderbufferParameteriv(GL_RENDERBUFFER,
 673                                  GL_RENDERBUFFER_HEIGHT, &h);
 674     glGetRenderbufferParameteriv(GL_RENDERBUFFER,
 675                                  GL_RENDERBUFFER_INTERNAL_FORMAT, &format);
 676
 677     glGenRenderbuffers(1, &rbs[*numRbs]);
 678     glBindRenderbuffer(GL_RENDERBUFFER, rbs[*numRbs]);
 679     glRenderbufferStorage(GL_RENDERBUFFER, format, w, h);
 680     glFramebufferRenderbuffer(GL_FRAMEBUFFER, drawbuffer,
 681                               GL_RENDERBUFFER, rbs[*numRbs]);
 682
 683     glBindFramebuffer(GL_READ_FRAMEBUFFER, oldFbo);
 684     glBindFramebuffer(GL_DRAW_FRAMEBUFFER, fbo);
 685     glDrawBuffer(drawbuffer);
 686     glReadBuffer(drawbuffer);
 687     glBlitFramebuffer(0, 0, w, h, 0, 0, w, h,
 688                       GL_COLOR_BUFFER_BIT, GL_NEAREST);
 689     glBindFramebuffer(GL_FRAMEBUFFER, fbo);
 690     ++*numRbs;
 691
 692     if (stencilRb == depthRb && stencilRb) {
 693         //combined depth and stencil buffer
 694         glBindRenderbuffer(GL_RENDERBUFFER, depthRb);
 695         glGetRenderbufferParameteriv(GL_RENDERBUFFER,
 696                                      GL_RENDERBUFFER_WIDTH, &w);
 697         glGetRenderbufferParameteriv(GL_RENDERBUFFER,
 698                                      GL_RENDERBUFFER_HEIGHT, &h);
 699         glGetRenderbufferParameteriv(GL_RENDERBUFFER,
 700                                      GL_RENDERBUFFER_INTERNAL_FORMAT, &format);
 701
 702         glGenRenderbuffers(1, &rbs[*numRbs]);
 703         glBindRenderbuffer(GL_RENDERBUFFER, rbs[*numRbs]);
 704         glRenderbufferStorage(GL_RENDERBUFFER, format, w, h);
 705         glFramebufferRenderbuffer(GL_FRAMEBUFFER, GL_DEPTH_STENCIL_ATTACHMENT,
 706                                   GL_RENDERBUFFER, rbs[*numRbs]);
 707         glBindFramebuffer(GL_READ_FRAMEBUFFER, oldFbo);
 708         glBindFramebuffer(GL_DRAW_FRAMEBUFFER, fbo);
 709         glBlitFramebuffer(0, 0, w, h, 0, 0, w, h,
 710                           GL_DEPTH_BUFFER_BIT | GL_STENCIL_BUFFER_BIT, GL_NEAREST);
 711         glBindFramebuffer(GL_FRAMEBUFFER, fbo);
 712         ++*numRbs;
 713     } else {
 714         if (depthRb) {
 715             glBindRenderbuffer(GL_RENDERBUFFER, depthRb);
 716             glGetRenderbufferParameteriv(GL_RENDERBUFFER,
 717                                          GL_RENDERBUFFER_WIDTH, &w);
 718             glGetRenderbufferParameteriv(GL_RENDERBUFFER,
 719                                          GL_RENDERBUFFER_HEIGHT, &h);
 720             glGetRenderbufferParameteriv(GL_RENDERBUFFER,
 721                                          GL_RENDERBUFFER_INTERNAL_FORMAT, &format);
 722
 723             glGenRenderbuffers(1, &rbs[*numRbs]);
 724             glBindRenderbuffer(GL_RENDERBUFFER, rbs[*numRbs]);
 725             glRenderbufferStorage(GL_RENDERBUFFER, format, w, h);
 726             glFramebufferRenderbuffer(GL_FRAMEBUFFER,
 727                                       GL_DEPTH_ATTACHMENT,
 728                                       GL_RENDERBUFFER, rbs[*numRbs]);
 729             glBindFramebuffer(GL_READ_FRAMEBUFFER, oldFbo);
 730             glBindFramebuffer(GL_DRAW_FRAMEBUFFER, fbo);
 731             glDrawBuffer(GL_DEPTH_ATTACHMENT);
 732             glReadBuffer(GL_DEPTH_ATTACHMENT);
 733             glBlitFramebuffer(0, 0, w, h, 0, 0, w, h,
 734                               GL_DEPTH_BUFFER_BIT, GL_NEAREST);
 735             ++*numRbs;
 736         }
 737         if (stencilRb) {
 738             glBindRenderbuffer(GL_RENDERBUFFER, stencilRb);
 739             glGetRenderbufferParameteriv(GL_RENDERBUFFER,
 740                                          GL_RENDERBUFFER_WIDTH, &w);
 741             glGetRenderbufferParameteriv(GL_RENDERBUFFER,
 742                                          GL_RENDERBUFFER_HEIGHT, &h);
 743             glGetRenderbufferParameteriv(GL_RENDERBUFFER,
 744                                      GL_RENDERBUFFER_INTERNAL_FORMAT, &format);
 745
 746             glGenRenderbuffers(1, &rbs[*numRbs]);
 747             glBindRenderbuffer(GL_RENDERBUFFER, rbs[*numRbs]);
 748             glRenderbufferStorage(GL_RENDERBUFFER, format, w, h);
 749             glFramebufferRenderbuffer(GL_FRAMEBUFFER,
 750                                       GL_STENCIL_ATTACHMENT,
 751                                       GL_RENDERBUFFER, rbs[*numRbs]);
 752             glBindFramebuffer(GL_READ_FRAMEBUFFER, oldFbo);
 753             glBindFramebuffer(GL_DRAW_FRAMEBUFFER, fbo);
 754             glDrawBuffer(GL_STENCIL_ATTACHMENT);
 755             glReadBuffer(GL_STENCIL_ATTACHMENT);
 756             glBlitFramebuffer(0, 0, w, h, 0, 0, w, h,
 757                               GL_STENCIL_BUFFER_BIT, GL_NEAREST);
 758             ++*numRbs;
 759         }
 760     }
 761
 762     return fbo;
 763 }
 764
 765
 766 /**
 767  * Dump images of current draw drawable/window.
 768  */
 769 static void
 770 dumpDrawableImages(JSONWriter &json)
 771 {
 772     GLint width, height;
 773
 774     if (!getDrawableBounds(&width, &height)) {
 775         return;
 776     }
 777
 778     GLint draw_buffer = GL_NONE;
 779     glGetIntegerv(GL_DRAW_BUFFER, &draw_buffer);
 780     glReadBuffer(draw_buffer);
 781
 782     if (draw_buffer != GL_NONE) {
 783         GLint read_buffer = GL_NONE;
 784         glGetIntegerv(GL_READ_BUFFER, &read_buffer);
 785
 786         GLint alpha_bits = 0;
 787         glGetIntegerv(GL_ALPHA_BITS, &alpha_bits);
 788         GLenum format = alpha_bits ? GL_RGBA : GL_RGB;
 789         json.beginMember(enumToString(draw_buffer));
 790         dumpReadBufferImage(json, width, height, format);
 791         json.endMember();
 792
 793         glReadBuffer(read_buffer);
 794     }
 795
 796     GLint depth_bits = 0;
 797     glGetIntegerv(GL_DEPTH_BITS, &depth_bits);
 798     if (depth_bits) {
 799         json.beginMember("GL_DEPTH_COMPONENT");
 800         dumpReadBufferImage(json, width, height, GL_DEPTH_COMPONENT);
 801         json.endMember();
 802     }
 803
 804     GLint stencil_bits = 0;
 805     glGetIntegerv(GL_STENCIL_BITS, &stencil_bits);
 806     if (stencil_bits) {
 807         json.beginMember("GL_STENCIL_INDEX");
 808         dumpReadBufferImage(json, width, height, GL_STENCIL_INDEX);
 809         json.endMember();
 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     json.beginMember(enumToString(attachment));
 826     dumpReadBufferImage(json, width, height, format);
 827     json.endMember();
 828 }
 829
 830
 831 static void
 832 dumpFramebufferAttachments(JSONWriter &json, GLenum target)
 833 {
 834     GLint read_framebuffer = 0;
 835     glGetIntegerv(GL_READ_FRAMEBUFFER_BINDING, &read_framebuffer);
 836
 837     GLint read_buffer = GL_NONE;
 838     glGetIntegerv(GL_READ_BUFFER, &read_buffer);
 839
 840     GLint max_draw_buffers = 1;
 841     glGetIntegerv(GL_MAX_DRAW_BUFFERS, &max_draw_buffers);
 842     GLint max_color_attachments = 0;
 843     glGetIntegerv(GL_MAX_COLOR_ATTACHMENTS, &max_color_attachments);
 844
 845     for (GLint i = 0; i < max_draw_buffers; ++i) {
 846         GLint draw_buffer = GL_NONE;
 847         glGetIntegerv(GL_DRAW_BUFFER0 + i, &draw_buffer);
 848         if (draw_buffer != GL_NONE) {
 849             glReadBuffer(draw_buffer);
 850             GLint attachment;
 851             if (draw_buffer >= GL_COLOR_ATTACHMENT0 && draw_buffer < GL_COLOR_ATTACHMENT0 + max_color_attachments) {
 852                 attachment = draw_buffer;
 853             } else {
 854                 std::cerr << "warning: unexpected GL_DRAW_BUFFER" << i << " = " << draw_buffer << "\n";
 855                 attachment = GL_COLOR_ATTACHMENT0;
 856             }
 857             GLint alpha_size = 0;
 858             glGetFramebufferAttachmentParameteriv(target, attachment,
 859                                                   GL_FRAMEBUFFER_ATTACHMENT_ALPHA_SIZE,
 860                                                   &alpha_size);
 861             GLenum format = alpha_size ? GL_RGBA : GL_RGB;
 862             dumpFramebufferAttachment(json, target, attachment, format);
 863         }
 864     }
 865
 866     glReadBuffer(read_buffer);
 867
 868     dumpFramebufferAttachment(json, target, GL_DEPTH_ATTACHMENT, GL_DEPTH_COMPONENT);
 869     dumpFramebufferAttachment(json, target, GL_STENCIL_ATTACHMENT, GL_STENCIL_INDEX);
 870
 871     glBindFramebuffer(GL_READ_FRAMEBUFFER, read_framebuffer);
 872 }
 873
 874
 875 static void
 876 dumpFramebuffer(JSONWriter &json)
 877 {
 878     json.beginMember("framebuffer");
 879     json.beginObject();
 880
 881     GLint boundDrawFbo = 0, boundReadFbo = 0;
 882     glGetIntegerv(GL_DRAW_FRAMEBUFFER_BINDING, &boundDrawFbo);
 883     glGetIntegerv(GL_READ_FRAMEBUFFER_BINDING, &boundReadFbo);
 884     if (!boundDrawFbo) {
 885         dumpDrawableImages(json);
 886     } else {
 887         GLint colorRb = 0, stencilRb = 0, depthRb = 0;
 888         GLint draw_buffer0 = GL_NONE;
 889         glGetIntegerv(GL_DRAW_BUFFER0, &draw_buffer0);
 890         bool multisample = false;
 891
 892         GLint boundRb = 0;
 893         glGetIntegerv(GL_RENDERBUFFER_BINDING, &boundRb);
 894
 895         GLint object_type;
 896         glGetFramebufferAttachmentParameteriv(GL_DRAW_FRAMEBUFFER, draw_buffer0, GL_FRAMEBUFFER_ATTACHMENT_OBJECT_TYPE, &object_type);
 897         if (object_type == GL_RENDERBUFFER) {
 898             glGetFramebufferAttachmentParameteriv(GL_DRAW_FRAMEBUFFER, draw_buffer0, GL_FRAMEBUFFER_ATTACHMENT_OBJECT_NAME, &colorRb);
 899             glBindRenderbuffer(GL_RENDERBUFFER, colorRb);
 900             GLint samples = 0;
 901             glGetRenderbufferParameteriv(GL_RENDERBUFFER, GL_RENDERBUFFER_SAMPLES, &samples);
 902             if (samples) {
 903                 multisample = true;
 904             }
 905         }
 906
 907         glGetFramebufferAttachmentParameteriv(GL_DRAW_FRAMEBUFFER, GL_DEPTH_ATTACHMENT, GL_FRAMEBUFFER_ATTACHMENT_OBJECT_TYPE, &object_type);
 908         if (object_type == GL_RENDERBUFFER) {
 909             glGetFramebufferAttachmentParameteriv(GL_DRAW_FRAMEBUFFER, GL_DEPTH_ATTACHMENT, GL_FRAMEBUFFER_ATTACHMENT_OBJECT_NAME, &depthRb);
 910             glBindRenderbuffer(GL_RENDERBUFFER, depthRb);
 911             GLint samples = 0;
 912             glGetRenderbufferParameteriv(GL_RENDERBUFFER, GL_RENDERBUFFER_SAMPLES, &samples);
 913             if (samples) {
 914                 multisample = true;
 915             }
 916         }
 917
 918         glGetFramebufferAttachmentParameteriv(GL_DRAW_FRAMEBUFFER, GL_STENCIL_ATTACHMENT, GL_FRAMEBUFFER_ATTACHMENT_OBJECT_TYPE, &object_type);
 919         if (object_type == GL_RENDERBUFFER) {
 920             glGetFramebufferAttachmentParameteriv(GL_DRAW_FRAMEBUFFER, GL_STENCIL_ATTACHMENT, GL_FRAMEBUFFER_ATTACHMENT_OBJECT_NAME, &stencilRb);
 921             glBindRenderbuffer(GL_RENDERBUFFER, stencilRb);
 922             GLint samples = 0;
 923             glGetRenderbufferParameteriv(GL_RENDERBUFFER, GL_RENDERBUFFER_SAMPLES, &samples);
 924             if (samples) {
 925                 multisample = true;
 926             }
 927         }
 928
 929         glBindRenderbuffer(GL_RENDERBUFFER, boundRb);
 930
 931         GLuint rbs[3];
 932         GLint numRbs = 0;
 933         GLuint fboCopy = 0;
 934
 935         if (multisample) {
 936             // glReadPixels doesnt support multisampled buffers so we need
 937             // to blit the fbo to a temporary one
 938             fboCopy = downsampledFramebuffer(boundDrawFbo, draw_buffer0,
 939                                              colorRb, depthRb, stencilRb,
 940                                              rbs, &numRbs);
 941         }
 942
 943         dumpFramebufferAttachments(json, GL_DRAW_FRAMEBUFFER);
 944
 945         if (multisample) {
 946             glBindRenderbuffer(GL_RENDERBUFFER_BINDING, boundRb);
 947             glDeleteRenderbuffers(numRbs, rbs);
 948             glDeleteFramebuffers(1, &fboCopy);
 949         }
 950
 951         glBindFramebuffer(GL_READ_FRAMEBUFFER, boundReadFbo);
 952         glBindFramebuffer(GL_DRAW_FRAMEBUFFER, boundDrawFbo);
 953     }
 954
 955     json.endObject();
 956     json.endMember(); // framebuffer
 957 }
 958
 959
 960 static const GLenum bindings[] = {
 961     GL_DRAW_BUFFER,
 962     GL_READ_BUFFER,
 963     GL_PIXEL_PACK_BUFFER_BINDING,
 964     GL_PIXEL_UNPACK_BUFFER_BINDING,
 965     GL_TEXTURE_BINDING_1D,
 966     GL_TEXTURE_BINDING_2D,
 967     GL_TEXTURE_BINDING_3D,
 968     GL_TEXTURE_BINDING_RECTANGLE,
 969     GL_TEXTURE_BINDING_CUBE_MAP,
 970     GL_DRAW_FRAMEBUFFER_BINDING,
 971     GL_READ_FRAMEBUFFER_BINDING,
 972     GL_RENDERBUFFER_BINDING,
 973     GL_DRAW_BUFFER0,
 974     GL_DRAW_BUFFER1,
 975     GL_DRAW_BUFFER2,
 976     GL_DRAW_BUFFER3,
 977     GL_DRAW_BUFFER4,
 978     GL_DRAW_BUFFER5,
 979     GL_DRAW_BUFFER6,
 980     GL_DRAW_BUFFER7,
 981 };
 982
 983
 984 #define NUM_BINDINGS sizeof(bindings)/sizeof(bindings[0])
 985
 986
 987 void dumpCurrentContext(std::ostream &os)
 988 {
 989     JSONWriter json(os);
 990
 991 #ifndef NDEBUG
 992     GLint old_bindings[NUM_BINDINGS];
 993     for (unsigned i = 0; i < NUM_BINDINGS; ++i) {
 994         old_bindings[i] = 0;
 995         glGetIntegerv(bindings[i], &old_bindings[i]);
 996     }
 997 #endif
 998
 999     dumpParameters(json);
1000     dumpShaders(json);
1001     dumpTextures(json);
1002     dumpFramebuffer(json);
1003
1004 #ifndef NDEBUG
1005     for (unsigned i = 0; i < NUM_BINDINGS; ++i) {
1006         GLint new_binding = 0;
1007         glGetIntegerv(bindings[i], &new_binding);
1008         if (new_binding != old_bindings[i]) {
1009             std::cerr << "warning: " << enumToString(bindings[i]) << " was clobbered\n";
1010         }
1011     }
1012 #endif
1013
1014 }
1015
1016
1017 } /* namespace glstate */