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
  29 #include <algorithm>
  30 #include <iostream>
  31 #include <map>
  32
  33 #include "image.hpp"
  34 #include "json.hpp"
  35 #include "glproc.hpp"
  36 #include "glsize.hpp"
  37 #include "glstate.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 namespace glstate {
  58
  59
  60 static inline void
  61 resetPixelPackState(void) {
  62     glPushClientAttrib(GL_CLIENT_PIXEL_STORE_BIT);
  63     glPixelStorei(GL_PACK_SWAP_BYTES, GL_FALSE);
  64     glPixelStorei(GL_PACK_LSB_FIRST, GL_FALSE);
  65     glPixelStorei(GL_PACK_ROW_LENGTH, 0);
  66     glPixelStorei(GL_PACK_IMAGE_HEIGHT, 0);
  67     glPixelStorei(GL_PACK_SKIP_ROWS, 0);
  68     glPixelStorei(GL_PACK_SKIP_PIXELS, 0);
  69     glPixelStorei(GL_PACK_SKIP_IMAGES, 0);
  70     glPixelStorei(GL_PACK_ALIGNMENT, 1);
  71     glBindBuffer(GL_PIXEL_PACK_BUFFER, 0);
  72 }
  73
  74
  75 static inline void
  76 restorePixelPackState(void) {
  77     glPopClientAttrib();
  78 }
  79
  80
  81 // Mapping from shader type to shader source, used to accumulated the sources
  82 // of different shaders with same type.
  83 typedef std::map<std::string, std::string> ShaderMap;
  84
  85
  86 static void
  87 getShaderSource(ShaderMap &shaderMap, GLuint shader)
  88 {
  89     if (!shader) {
  90         return;
  91     }
  92
  93     GLint shader_type = 0;
  94     glGetShaderiv(shader, GL_SHADER_TYPE, &shader_type);
  95     if (!shader_type) {
  96         return;
  97     }
  98
  99     GLint source_length = 0;
 100     glGetShaderiv(shader, GL_SHADER_SOURCE_LENGTH, &source_length);
 101     if (!source_length) {
 102         return;
 103     }
 104
 105     GLchar *source = new GLchar[source_length];
 106     GLsizei length = 0;
 107     source[0] = 0;
 108     glGetShaderSource(shader, source_length, &length, source);
 109
 110     shaderMap[enumToString(shader_type)] += source;
 111
 112     delete [] source;
 113 }
 114
 115
 116 static void
 117 getShaderObjSource(ShaderMap &shaderMap, GLhandleARB shaderObj)
 118 {
 119     if (!shaderObj) {
 120         return;
 121     }
 122
 123     GLint shader_type = 0;
 124     glGetObjectParameterivARB(shaderObj, GL_OBJECT_TYPE_ARB, &shader_type);
 125     if (!shader_type) {
 126         return;
 127     }
 128
 129     GLint source_length = 0;
 130     glGetObjectParameterivARB(shaderObj, GL_OBJECT_SHADER_SOURCE_LENGTH_ARB, &source_length);
 131     if (!source_length) {
 132         return;
 133     }
 134
 135     GLcharARB *source = new GLcharARB[source_length];
 136     GLsizei length = 0;
 137     source[0] = 0;
 138     glGetShaderSource(shaderObj, source_length, &length, source);
 139
 140     shaderMap[enumToString(shader_type)] += source;
 141
 142     delete [] source;
 143 }
 144
 145
 146 static inline void
 147 dumpCurrentProgram(JSONWriter &json)
 148 {
 149     GLint program = 0;
 150     glGetIntegerv(GL_CURRENT_PROGRAM, &program);
 151     if (!program) {
 152         return;
 153     }
 154
 155     GLint attached_shaders = 0;
 156     glGetProgramiv(program, GL_ATTACHED_SHADERS, &attached_shaders);
 157     if (!attached_shaders) {
 158         return;
 159     }
 160
 161     ShaderMap shaderMap;
 162
 163     GLuint *shaders = new GLuint[attached_shaders];
 164     GLsizei count = 0;
 165     glGetAttachedShaders(program, attached_shaders, &count, shaders);
 166     std::sort(shaders, shaders + count);
 167     for (GLsizei i = 0; i < count; ++ i) {
 168        getShaderSource(shaderMap, shaders[i]);
 169     }
 170     delete [] shaders;
 171
 172     for (ShaderMap::const_iterator it = shaderMap.begin(); it != shaderMap.end(); ++it) {
 173         json.beginMember(it->first);
 174         json.writeString(it->second);
 175         json.endMember();
 176     }
 177 }
 178
 179
 180 static inline void
 181 dumpCurrentProgramObj(JSONWriter &json)
 182 {
 183     GLhandleARB programObj = glGetHandleARB(GL_PROGRAM_OBJECT_ARB);
 184     if (!programObj) {
 185         return;
 186     }
 187
 188     GLint attached_shaders = 0;
 189     glGetProgramivARB(programObj, GL_OBJECT_ATTACHED_OBJECTS_ARB, &attached_shaders);
 190     if (!attached_shaders) {
 191         return;
 192     }
 193
 194     ShaderMap shaderMap;
 195
 196     GLhandleARB *shaderObjs = new GLhandleARB[attached_shaders];
 197     GLsizei count = 0;
 198     glGetAttachedObjectsARB(programObj, attached_shaders, &count, shaderObjs);
 199     std::sort(shaderObjs, shaderObjs + count);
 200     for (GLsizei i = 0; i < count; ++ i) {
 201        getShaderObjSource(shaderMap, shaderObjs[i]);
 202     }
 203     delete [] shaderObjs;
 204
 205     for (ShaderMap::const_iterator it = shaderMap.begin(); it != shaderMap.end(); ++it) {
 206         json.beginMember(it->first);
 207         json.writeString(it->second);
 208         json.endMember();
 209     }
 210 }
 211
 212
 213 static inline void
 214 dumpArbProgram(JSONWriter &json, GLenum target)
 215 {
 216     if (!glIsEnabled(target)) {
 217         return;
 218     }
 219
 220     GLint program_length = 0;
 221     glGetProgramivARB(target, GL_PROGRAM_LENGTH_ARB, &program_length);
 222     if (!program_length) {
 223         return;
 224     }
 225
 226     GLchar *source = new GLchar[program_length + 1];
 227     source[0] = 0;
 228     glGetProgramStringARB(target, GL_PROGRAM_STRING_ARB, source);
 229     source[program_length] = 0;
 230
 231     json.beginMember(enumToString(target));
 232     json.writeString(source);
 233     json.endMember();
 234
 235     delete [] source;
 236 }
 237
 238
 239 static inline void
 240 dumpShaders(JSONWriter &json)
 241 {
 242     json.beginMember("shaders");
 243     json.beginObject();
 244     dumpCurrentProgram(json);
 245     dumpCurrentProgramObj(json);
 246     dumpArbProgram(json, GL_FRAGMENT_PROGRAM_ARB);
 247     dumpArbProgram(json, GL_VERTEX_PROGRAM_ARB);
 248     json.endObject();
 249     json.endMember(); //shaders
 250 }
 251
 252
 253 static inline void
 254 dumpTextureImage(JSONWriter &json, GLenum target, GLint level)
 255 {
 256     GLint width, height = 1, depth = 1;
 257
 258     width = 0;
 259     glGetTexLevelParameteriv(target, level, GL_TEXTURE_WIDTH, &width);
 260
 261     if (target != GL_TEXTURE_1D) {
 262         height = 0;
 263         glGetTexLevelParameteriv(target, level, GL_TEXTURE_HEIGHT, &height);
 264         if (target == GL_TEXTURE_3D) {
 265             depth = 0;
 266             glGetTexLevelParameteriv(target, level, GL_TEXTURE_DEPTH, &depth);
 267         }
 268     }
 269
 270     if (width <= 0 || height <= 0 || depth <= 0) {
 271         return;
 272     } else {
 273         char label[512];
 274
 275         GLint active_texture = GL_TEXTURE0;
 276         glGetIntegerv(GL_ACTIVE_TEXTURE, &active_texture);
 277         snprintf(label, sizeof label, "%s, %s, level = %i", enumToString(active_texture), enumToString(target), level);
 278
 279         json.beginMember(label);
 280
 281         json.beginObject();
 282
 283         // Tell the GUI this is no ordinary object, but an image
 284         json.writeStringMember("__class__", "image");
 285
 286         json.writeNumberMember("__width__", width);
 287         json.writeNumberMember("__height__", height);
 288         json.writeNumberMember("__depth__", depth);
 289
 290         // Hardcoded for now, but we could chose types more adequate to the
 291         // texture internal format
 292         json.writeStringMember("__type__", "uint8");
 293         json.writeBoolMember("__normalized__", true);
 294         json.writeNumberMember("__channels__", 4);
 295
 296         GLubyte *pixels = new GLubyte[depth*width*height*4];
 297
 298         resetPixelPackState();
 299
 300         glGetTexImage(target, level, GL_RGBA, GL_UNSIGNED_BYTE, pixels);
 301
 302         restorePixelPackState();
 303
 304         json.beginMember("__data__");
 305         char *pngBuffer;
 306         int pngBufferSize;
 307         Image::writePixelsToBuffer(pixels, width, height, 4, false, &pngBuffer, &pngBufferSize);
 308         json.writeBase64(pngBuffer, pngBufferSize);
 309         free(pngBuffer);
 310         json.endMember(); // __data__
 311
 312         delete [] pixels;
 313         json.endObject();
 314     }
 315 }
 316
 317
 318 static inline void
 319 dumpTexture(JSONWriter &json, GLenum target, GLenum binding)
 320 {
 321     GLint texture_binding = 0;
 322     glGetIntegerv(binding, &texture_binding);
 323     if (!glIsEnabled(target) && !texture_binding) {
 324         return;
 325     }
 326
 327     GLint level = 0;
 328     do {
 329         GLint width = 0, height = 0;
 330         glGetTexLevelParameteriv(target, level, GL_TEXTURE_WIDTH, &width);
 331         glGetTexLevelParameteriv(target, level, GL_TEXTURE_HEIGHT, &height);
 332         if (!width || !height) {
 333             break;
 334         }
 335
 336         if (target == GL_TEXTURE_CUBE_MAP) {
 337             for (int face = 0; face < 6; ++face) {
 338                 dumpTextureImage(json, GL_TEXTURE_CUBE_MAP_POSITIVE_X + face, level);
 339             }
 340         } else {
 341             dumpTextureImage(json, target, level);
 342         }
 343
 344         ++level;
 345     } while(true);
 346 }
 347
 348
 349 static inline void
 350 dumpTextures(JSONWriter &json)
 351 {
 352     json.beginMember("textures");
 353     json.beginObject();
 354     GLint active_texture = GL_TEXTURE0;
 355     glGetIntegerv(GL_ACTIVE_TEXTURE, &active_texture);
 356     GLint max_texture_coords = 0;
 357     glGetIntegerv(GL_MAX_TEXTURE_COORDS, &max_texture_coords);
 358     GLint max_combined_texture_image_units = 0;
 359     glGetIntegerv(GL_MAX_COMBINED_TEXTURE_IMAGE_UNITS, &max_combined_texture_image_units);
 360     GLint max_units = std::max(max_combined_texture_image_units, max_texture_coords);
 361     for (GLint unit = 0; unit < max_units; ++unit) {
 362         GLenum texture = GL_TEXTURE0 + unit;
 363         glActiveTexture(texture);
 364         dumpTexture(json, GL_TEXTURE_1D, GL_TEXTURE_BINDING_1D);
 365         dumpTexture(json, GL_TEXTURE_2D, GL_TEXTURE_BINDING_2D);
 366         dumpTexture(json, GL_TEXTURE_3D, GL_TEXTURE_BINDING_3D);
 367         dumpTexture(json, GL_TEXTURE_RECTANGLE, GL_TEXTURE_BINDING_RECTANGLE);
 368         dumpTexture(json, GL_TEXTURE_CUBE_MAP, GL_TEXTURE_BINDING_CUBE_MAP);
 369     }
 370     glActiveTexture(active_texture);
 371     json.endObject();
 372     json.endMember(); // textures
 373 }
 374
 375
 376 static bool
 377 getDrawableBounds(GLint *width, GLint *height) {
 378 #if defined(_WIN32)
 379
 380     HDC hDC = wglGetCurrentDC();
 381     if (!hDC) {
 382         return false;
 383     }
 384
 385     HWND hWnd = WindowFromDC(hDC);
 386     RECT rect;
 387
 388     if (!GetClientRect(hWnd, &rect)) {
 389        return false;
 390     }
 391
 392     *width  = rect.right  - rect.left;
 393     *height = rect.bottom - rect.top;
 394
 395 #elif defined(__APPLE__)
 396
 397     CGLContextObj ctx = CGLGetCurrentContext();
 398     if (ctx == NULL) {
 399         return false;
 400     }
 401
 402     CGSConnectionID cid;
 403     CGSWindowID wid;
 404     CGSSurfaceID sid;
 405
 406     if (CGLGetSurface(ctx, &cid, &wid, &sid) != kCGLNoError) {
 407         return false;
 408     }
 409
 410     CGRect rect;
 411
 412     if (CGSGetSurfaceBounds(cid, wid, sid, &rect) != 0) {
 413         return false;
 414     }
 415
 416     *width = rect.size.width;
 417     *height = rect.size.height;
 418
 419 #else
 420
 421     Display *display;
 422     Drawable drawable;
 423     Window root;
 424     int x, y;
 425     unsigned int w, h, bw, depth;
 426
 427     display = glXGetCurrentDisplay();
 428     if (!display) {
 429         return false;
 430     }
 431
 432     drawable = glXGetCurrentDrawable();
 433     if (drawable == None) {
 434         return false;
 435     }
 436
 437     if (!XGetGeometry(display, drawable, &root, &x, &y, &w, &h, &bw, &depth)) {
 438         return false;
 439     }
 440
 441     *width = w;
 442     *height = h;
 443
 444 #endif
 445
 446     return true;
 447 }
 448
 449
 450 static const GLenum texture_bindings[][2] = {
 451     {GL_TEXTURE_1D, GL_TEXTURE_BINDING_1D},
 452     {GL_TEXTURE_2D, GL_TEXTURE_BINDING_2D},
 453     {GL_TEXTURE_3D, GL_TEXTURE_BINDING_3D},
 454     {GL_TEXTURE_RECTANGLE, GL_TEXTURE_BINDING_RECTANGLE},
 455     {GL_TEXTURE_CUBE_MAP, GL_TEXTURE_BINDING_CUBE_MAP}
 456 };
 457
 458
 459 static bool
 460 bindTexture(GLint texture, GLenum &target, GLint &bound_texture)
 461 {
 462
 463     for (unsigned i = 0; i < sizeof(texture_bindings)/sizeof(texture_bindings[0]); ++i) {
 464         target  = texture_bindings[i][0];
 465
 466         GLenum binding = texture_bindings[i][1];
 467
 468         while (glGetError() != GL_NO_ERROR)
 469             ;
 470
 471         glGetIntegerv(binding, &bound_texture);
 472         glBindTexture(target, texture);
 473
 474         if (glGetError() == GL_NO_ERROR) {
 475             return true;
 476         }
 477
 478         glBindTexture(target, bound_texture);
 479     }
 480
 481     target = GL_NONE;
 482
 483     return false;
 484 }
 485
 486
 487 static bool
 488 getTextureLevelSize(GLint texture, GLint level, GLint *width, GLint *height)
 489 {
 490     *width = 0;
 491     *height = 0;
 492
 493     GLenum target;
 494     GLint bound_texture = 0;
 495     if (!bindTexture(texture, target, bound_texture)) {
 496         return false;
 497     }
 498
 499     glGetTexLevelParameteriv(target, level, GL_TEXTURE_WIDTH, width);
 500     glGetTexLevelParameteriv(target, level, GL_TEXTURE_HEIGHT, height);
 501
 502     glBindTexture(target, bound_texture);
 503
 504     return *width > 0 && *height > 0;
 505 }
 506
 507
 508 static bool
 509 getRenderbufferSize(GLint renderbuffer, GLint *width, GLint *height)
 510 {
 511     GLint bound_renderbuffer = 0;
 512     glGetIntegerv(GL_RENDERBUFFER_BINDING, &bound_renderbuffer);
 513     glBindRenderbuffer(GL_RENDERBUFFER, renderbuffer);
 514
 515     *width = 0;
 516     *height = 0;
 517     glGetRenderbufferParameteriv(GL_RENDERBUFFER, GL_RENDERBUFFER_WIDTH, width);
 518     glGetRenderbufferParameteriv(GL_RENDERBUFFER, GL_RENDERBUFFER_HEIGHT, height);
 519
 520     glBindRenderbuffer(GL_RENDERBUFFER, bound_renderbuffer);
 521
 522     return *width > 0 && *height > 0;
 523 }
 524
 525
 526 static bool
 527 getFramebufferAttachmentSize(GLenum target, GLenum attachment, GLint *width, GLint *height)
 528 {
 529     GLint object_type = GL_NONE;
 530     glGetFramebufferAttachmentParameteriv(target, attachment,
 531                                           GL_FRAMEBUFFER_ATTACHMENT_OBJECT_TYPE,
 532                                           &object_type);
 533     if (object_type == GL_NONE) {
 534         return false;
 535     }
 536
 537     GLint object_name = 0;
 538     glGetFramebufferAttachmentParameteriv(target, attachment,
 539                                           GL_FRAMEBUFFER_ATTACHMENT_OBJECT_NAME,
 540                                           &object_name);
 541     if (object_name == 0) {
 542         return false;
 543     }
 544
 545     if (object_type == GL_RENDERBUFFER) {
 546         return getRenderbufferSize(object_name, width, height);
 547     } else if (object_type == GL_TEXTURE) {
 548         GLint texture_level = 0;
 549         glGetFramebufferAttachmentParameteriv(target, attachment,
 550                                               GL_FRAMEBUFFER_ATTACHMENT_TEXTURE_LEVEL,
 551                                               &texture_level);
 552         return getTextureLevelSize(object_name, texture_level, width, height);
 553     } else {
 554         std::cerr << "warning: unexpected GL_FRAMEBUFFER_ATTACHMENT_OBJECT_TYPE = " << object_type << "\n";
 555         return false;
 556     }
 557 }
 558
 559
 560 Image::Image *
 561 getDrawBufferImage(GLenum format) {
 562     GLint channels = __gl_format_channels(format);
 563     if (channels > 4) {
 564         return NULL;
 565     }
 566
 567     GLint draw_framebuffer = 0;
 568     glGetIntegerv(GL_DRAW_FRAMEBUFFER_BINDING, &draw_framebuffer);
 569
 570     GLint draw_buffer = GL_NONE;
 571     GLint width, height;
 572     if (draw_framebuffer) {
 573         glGetIntegerv(GL_DRAW_BUFFER0, &draw_buffer);
 574         if (draw_buffer == GL_NONE) {
 575             return NULL;
 576         }
 577
 578         if (!getFramebufferAttachmentSize(GL_DRAW_FRAMEBUFFER, draw_buffer, &width, &height)) {
 579             return NULL;
 580         }
 581     } else {
 582         glGetIntegerv(GL_DRAW_BUFFER, &draw_buffer);
 583         if (draw_buffer == GL_NONE) {
 584             return NULL;
 585         }
 586
 587         if (!getDrawableBounds(&width, &height)) {
 588             return NULL;
 589         }
 590     }
 591
 592     Image::Image *image = new Image::Image(width, height, channels, true);
 593     if (!image) {
 594         return NULL;
 595     }
 596
 597     while (glGetError() != GL_NO_ERROR) {}
 598
 599     GLint read_framebuffer = 0;
 600     glGetIntegerv(GL_READ_FRAMEBUFFER_BINDING, &read_framebuffer);
 601     glBindFramebuffer(GL_READ_FRAMEBUFFER, draw_framebuffer);
 602
 603     GLint read_buffer = 0;
 604     glGetIntegerv(GL_READ_BUFFER, &read_buffer);
 605     glReadBuffer(draw_buffer);
 606
 607     // TODO: reset imaging state too
 608     resetPixelPackState();
 609
 610     glReadPixels(0, 0, width, height, format, GL_UNSIGNED_BYTE, image->pixels);
 611
 612     restorePixelPackState();
 613     glReadBuffer(read_buffer);
 614     glBindFramebuffer(GL_READ_FRAMEBUFFER, read_framebuffer);
 615
 616     GLenum error = glGetError();
 617     if (error != GL_NO_ERROR) {
 618         do {
 619             std::cerr << "warning: " << enumToString(error) << " while getting snapshot\n";
 620             error = glGetError();
 621         } while(error != GL_NO_ERROR);
 622         delete image;
 623         return NULL;
 624     }
 625
 626     return image;
 627 }
 628
 629
 630 /**
 631  * Dump the image of the currently bound read buffer.
 632  */
 633 static inline void
 634 dumpReadBufferImage(JSONWriter &json, GLint width, GLint height, GLenum format)
 635 {
 636     GLint channels = __gl_format_channels(format);
 637
 638     json.beginObject();
 639
 640     // Tell the GUI this is no ordinary object, but an image
 641     json.writeStringMember("__class__", "image");
 642
 643     json.writeNumberMember("__width__", width);
 644     json.writeNumberMember("__height__", height);
 645     json.writeNumberMember("__depth__", 1);
 646
 647     // Hardcoded for now, but we could chose types more adequate to the
 648     // texture internal format
 649     json.writeStringMember("__type__", "uint8");
 650     json.writeBoolMember("__normalized__", true);
 651     json.writeNumberMember("__channels__", channels);
 652
 653     GLubyte *pixels = new GLubyte[width*height*channels];
 654
 655     // TODO: reset imaging state too
 656     resetPixelPackState();
 657
 658     glReadPixels(0, 0, width, height, format, GL_UNSIGNED_BYTE, pixels);
 659
 660     restorePixelPackState();
 661
 662     json.beginMember("__data__");
 663     char *pngBuffer;
 664     int pngBufferSize;
 665     Image::writePixelsToBuffer(pixels, width, height, channels, false, &pngBuffer, &pngBufferSize);
 666     //std::cerr <<" Before = "<<(width * height * channels * sizeof *pixels)
 667     //          <<", after = "<<pngBufferSize << ", ratio = " << double(width * height * channels * sizeof *pixels)/pngBufferSize;
 668     json.writeBase64(pngBuffer, pngBufferSize);
 669     free(pngBuffer);
 670     json.endMember(); // __data__
 671
 672     delete [] pixels;
 673     json.endObject();
 674 }
 675
 676
 677 static inline GLuint
 678 downsampledFramebuffer(GLuint oldFbo, GLint drawbuffer,
 679                        GLint colorRb, GLint depthRb, GLint stencilRb,
 680                        GLuint *rbs, GLint *numRbs)
 681 {
 682     GLuint fbo;
 683     GLint format;
 684     GLint w, h;
 685
 686     *numRbs = 0;
 687
 688     glGenFramebuffers(1, &fbo);
 689     glBindFramebuffer(GL_FRAMEBUFFER, fbo);
 690
 691     glBindRenderbuffer(GL_RENDERBUFFER, colorRb);
 692     glGetRenderbufferParameteriv(GL_RENDERBUFFER,
 693                                  GL_RENDERBUFFER_WIDTH, &w);
 694     glGetRenderbufferParameteriv(GL_RENDERBUFFER,
 695                                  GL_RENDERBUFFER_HEIGHT, &h);
 696     glGetRenderbufferParameteriv(GL_RENDERBUFFER,
 697                                  GL_RENDERBUFFER_INTERNAL_FORMAT, &format);
 698
 699     glGenRenderbuffers(1, &rbs[*numRbs]);
 700     glBindRenderbuffer(GL_RENDERBUFFER, rbs[*numRbs]);
 701     glRenderbufferStorage(GL_RENDERBUFFER, format, w, h);
 702     glFramebufferRenderbuffer(GL_FRAMEBUFFER, drawbuffer,
 703                               GL_RENDERBUFFER, rbs[*numRbs]);
 704
 705     glBindFramebuffer(GL_READ_FRAMEBUFFER, oldFbo);
 706     glBindFramebuffer(GL_DRAW_FRAMEBUFFER, fbo);
 707     glDrawBuffer(drawbuffer);
 708     glReadBuffer(drawbuffer);
 709     glBlitFramebuffer(0, 0, w, h, 0, 0, w, h,
 710                       GL_COLOR_BUFFER_BIT, GL_NEAREST);
 711     glBindFramebuffer(GL_FRAMEBUFFER, fbo);
 712     ++*numRbs;
 713
 714     if (stencilRb == depthRb && stencilRb) {
 715         //combined depth and stencil buffer
 716         glBindRenderbuffer(GL_RENDERBUFFER, depthRb);
 717         glGetRenderbufferParameteriv(GL_RENDERBUFFER,
 718                                      GL_RENDERBUFFER_WIDTH, &w);
 719         glGetRenderbufferParameteriv(GL_RENDERBUFFER,
 720                                      GL_RENDERBUFFER_HEIGHT, &h);
 721         glGetRenderbufferParameteriv(GL_RENDERBUFFER,
 722                                      GL_RENDERBUFFER_INTERNAL_FORMAT, &format);
 723
 724         glGenRenderbuffers(1, &rbs[*numRbs]);
 725         glBindRenderbuffer(GL_RENDERBUFFER, rbs[*numRbs]);
 726         glRenderbufferStorage(GL_RENDERBUFFER, format, w, h);
 727         glFramebufferRenderbuffer(GL_FRAMEBUFFER, GL_DEPTH_STENCIL_ATTACHMENT,
 728                                   GL_RENDERBUFFER, rbs[*numRbs]);
 729         glBindFramebuffer(GL_READ_FRAMEBUFFER, oldFbo);
 730         glBindFramebuffer(GL_DRAW_FRAMEBUFFER, fbo);
 731         glBlitFramebuffer(0, 0, w, h, 0, 0, w, h,
 732                           GL_DEPTH_BUFFER_BIT | GL_STENCIL_BUFFER_BIT, GL_NEAREST);
 733         glBindFramebuffer(GL_FRAMEBUFFER, fbo);
 734         ++*numRbs;
 735     } else {
 736         if (depthRb) {
 737             glBindRenderbuffer(GL_RENDERBUFFER, depthRb);
 738             glGetRenderbufferParameteriv(GL_RENDERBUFFER,
 739                                          GL_RENDERBUFFER_WIDTH, &w);
 740             glGetRenderbufferParameteriv(GL_RENDERBUFFER,
 741                                          GL_RENDERBUFFER_HEIGHT, &h);
 742             glGetRenderbufferParameteriv(GL_RENDERBUFFER,
 743                                          GL_RENDERBUFFER_INTERNAL_FORMAT, &format);
 744
 745             glGenRenderbuffers(1, &rbs[*numRbs]);
 746             glBindRenderbuffer(GL_RENDERBUFFER, rbs[*numRbs]);
 747             glRenderbufferStorage(GL_RENDERBUFFER, format, w, h);
 748             glFramebufferRenderbuffer(GL_FRAMEBUFFER,
 749                                       GL_DEPTH_ATTACHMENT,
 750                                       GL_RENDERBUFFER, rbs[*numRbs]);
 751             glBindFramebuffer(GL_READ_FRAMEBUFFER, oldFbo);
 752             glBindFramebuffer(GL_DRAW_FRAMEBUFFER, fbo);
 753             glDrawBuffer(GL_DEPTH_ATTACHMENT);
 754             glReadBuffer(GL_DEPTH_ATTACHMENT);
 755             glBlitFramebuffer(0, 0, w, h, 0, 0, w, h,
 756                               GL_DEPTH_BUFFER_BIT, GL_NEAREST);
 757             ++*numRbs;
 758         }
 759         if (stencilRb) {
 760             glBindRenderbuffer(GL_RENDERBUFFER, stencilRb);
 761             glGetRenderbufferParameteriv(GL_RENDERBUFFER,
 762                                          GL_RENDERBUFFER_WIDTH, &w);
 763             glGetRenderbufferParameteriv(GL_RENDERBUFFER,
 764                                          GL_RENDERBUFFER_HEIGHT, &h);
 765             glGetRenderbufferParameteriv(GL_RENDERBUFFER,
 766                                      GL_RENDERBUFFER_INTERNAL_FORMAT, &format);
 767
 768             glGenRenderbuffers(1, &rbs[*numRbs]);
 769             glBindRenderbuffer(GL_RENDERBUFFER, rbs[*numRbs]);
 770             glRenderbufferStorage(GL_RENDERBUFFER, format, w, h);
 771             glFramebufferRenderbuffer(GL_FRAMEBUFFER,
 772                                       GL_STENCIL_ATTACHMENT,
 773                                       GL_RENDERBUFFER, rbs[*numRbs]);
 774             glBindFramebuffer(GL_READ_FRAMEBUFFER, oldFbo);
 775             glBindFramebuffer(GL_DRAW_FRAMEBUFFER, fbo);
 776             glDrawBuffer(GL_STENCIL_ATTACHMENT);
 777             glReadBuffer(GL_STENCIL_ATTACHMENT);
 778             glBlitFramebuffer(0, 0, w, h, 0, 0, w, h,
 779                               GL_STENCIL_BUFFER_BIT, GL_NEAREST);
 780             ++*numRbs;
 781         }
 782     }
 783
 784     return fbo;
 785 }
 786
 787
 788 /**
 789  * Dump images of current draw drawable/window.
 790  */
 791 static void
 792 dumpDrawableImages(JSONWriter &json)
 793 {
 794     GLint width, height;
 795
 796     if (!getDrawableBounds(&width, &height)) {
 797         return;
 798     }
 799
 800     GLint draw_buffer = GL_NONE;
 801     glGetIntegerv(GL_DRAW_BUFFER, &draw_buffer);
 802     glReadBuffer(draw_buffer);
 803
 804     if (draw_buffer != GL_NONE) {
 805         GLint read_buffer = GL_NONE;
 806         glGetIntegerv(GL_READ_BUFFER, &read_buffer);
 807
 808         GLint alpha_bits = 0;
 809         glGetIntegerv(GL_ALPHA_BITS, &alpha_bits);
 810         GLenum format = alpha_bits ? GL_RGBA : GL_RGB;
 811         json.beginMember(enumToString(draw_buffer));
 812         dumpReadBufferImage(json, width, height, format);
 813         json.endMember();
 814
 815         glReadBuffer(read_buffer);
 816     }
 817
 818     GLint depth_bits = 0;
 819     glGetIntegerv(GL_DEPTH_BITS, &depth_bits);
 820     if (depth_bits) {
 821         json.beginMember("GL_DEPTH_COMPONENT");
 822         dumpReadBufferImage(json, width, height, GL_DEPTH_COMPONENT);
 823         json.endMember();
 824     }
 825
 826     GLint stencil_bits = 0;
 827     glGetIntegerv(GL_STENCIL_BITS, &stencil_bits);
 828     if (stencil_bits) {
 829         json.beginMember("GL_STENCIL_INDEX");
 830         dumpReadBufferImage(json, width, height, GL_STENCIL_INDEX);
 831         json.endMember();
 832     }
 833 }
 834 /**
 835  * Dump the specified framebuffer attachment.
 836  *
 837  * In the case of a color attachment, it assumes it is already bound for read.
 838  */
 839 static void
 840 dumpFramebufferAttachment(JSONWriter &json, GLenum target, GLenum attachment, GLenum format)
 841 {
 842     GLint width = 0, height = 0;
 843     if (!getFramebufferAttachmentSize(target, attachment, &width, &height)) {
 844         return;
 845     }
 846
 847     json.beginMember(enumToString(attachment));
 848     dumpReadBufferImage(json, width, height, format);
 849     json.endMember();
 850 }
 851
 852
 853 static void
 854 dumpFramebufferAttachments(JSONWriter &json, GLenum target)
 855 {
 856     GLint read_framebuffer = 0;
 857     glGetIntegerv(GL_READ_FRAMEBUFFER_BINDING, &read_framebuffer);
 858
 859     GLint read_buffer = GL_NONE;
 860     glGetIntegerv(GL_READ_BUFFER, &read_buffer);
 861
 862     GLint max_draw_buffers = 1;
 863     glGetIntegerv(GL_MAX_DRAW_BUFFERS, &max_draw_buffers);
 864     GLint max_color_attachments = 0;
 865     glGetIntegerv(GL_MAX_COLOR_ATTACHMENTS, &max_color_attachments);
 866
 867     for (GLint i = 0; i < max_draw_buffers; ++i) {
 868         GLint draw_buffer = GL_NONE;
 869         glGetIntegerv(GL_DRAW_BUFFER0 + i, &draw_buffer);
 870         if (draw_buffer != GL_NONE) {
 871             glReadBuffer(draw_buffer);
 872             GLint attachment;
 873             if (draw_buffer >= GL_COLOR_ATTACHMENT0 && draw_buffer < GL_COLOR_ATTACHMENT0 + max_color_attachments) {
 874                 attachment = draw_buffer;
 875             } else {
 876                 std::cerr << "warning: unexpected GL_DRAW_BUFFER" << i << " = " << draw_buffer << "\n";
 877                 attachment = GL_COLOR_ATTACHMENT0;
 878             }
 879             GLint alpha_size = 0;
 880             glGetFramebufferAttachmentParameteriv(target, attachment,
 881                                                   GL_FRAMEBUFFER_ATTACHMENT_ALPHA_SIZE,
 882                                                   &alpha_size);
 883             GLenum format = alpha_size ? GL_RGBA : GL_RGB;
 884             dumpFramebufferAttachment(json, target, attachment, format);
 885         }
 886     }
 887
 888     glReadBuffer(read_buffer);
 889
 890     dumpFramebufferAttachment(json, target, GL_DEPTH_ATTACHMENT, GL_DEPTH_COMPONENT);
 891     dumpFramebufferAttachment(json, target, GL_STENCIL_ATTACHMENT, GL_STENCIL_INDEX);
 892
 893     glBindFramebuffer(GL_READ_FRAMEBUFFER, read_framebuffer);
 894 }
 895
 896
 897 static void
 898 dumpFramebuffer(JSONWriter &json)
 899 {
 900     json.beginMember("framebuffer");
 901     json.beginObject();
 902
 903     GLint boundDrawFbo = 0, boundReadFbo = 0;
 904     glGetIntegerv(GL_DRAW_FRAMEBUFFER_BINDING, &boundDrawFbo);
 905     glGetIntegerv(GL_READ_FRAMEBUFFER_BINDING, &boundReadFbo);
 906     if (!boundDrawFbo) {
 907         dumpDrawableImages(json);
 908     } else {
 909         GLint colorRb = 0, stencilRb = 0, depthRb = 0;
 910         GLint draw_buffer0 = GL_NONE;
 911         glGetIntegerv(GL_DRAW_BUFFER0, &draw_buffer0);
 912         bool multisample = false;
 913
 914         GLint boundRb = 0;
 915         glGetIntegerv(GL_RENDERBUFFER_BINDING, &boundRb);
 916
 917         GLint object_type;
 918         glGetFramebufferAttachmentParameteriv(GL_DRAW_FRAMEBUFFER, draw_buffer0, GL_FRAMEBUFFER_ATTACHMENT_OBJECT_TYPE, &object_type);
 919         if (object_type == GL_RENDERBUFFER) {
 920             glGetFramebufferAttachmentParameteriv(GL_DRAW_FRAMEBUFFER, draw_buffer0, GL_FRAMEBUFFER_ATTACHMENT_OBJECT_NAME, &colorRb);
 921             glBindRenderbuffer(GL_RENDERBUFFER, colorRb);
 922             GLint samples = 0;
 923             glGetRenderbufferParameteriv(GL_RENDERBUFFER, GL_RENDERBUFFER_SAMPLES, &samples);
 924             if (samples) {
 925                 multisample = true;
 926             }
 927         }
 928
 929         glGetFramebufferAttachmentParameteriv(GL_DRAW_FRAMEBUFFER, GL_DEPTH_ATTACHMENT, GL_FRAMEBUFFER_ATTACHMENT_OBJECT_TYPE, &object_type);
 930         if (object_type == GL_RENDERBUFFER) {
 931             glGetFramebufferAttachmentParameteriv(GL_DRAW_FRAMEBUFFER, GL_DEPTH_ATTACHMENT, GL_FRAMEBUFFER_ATTACHMENT_OBJECT_NAME, &depthRb);
 932             glBindRenderbuffer(GL_RENDERBUFFER, depthRb);
 933             GLint samples = 0;
 934             glGetRenderbufferParameteriv(GL_RENDERBUFFER, GL_RENDERBUFFER_SAMPLES, &samples);
 935             if (samples) {
 936                 multisample = true;
 937             }
 938         }
 939
 940         glGetFramebufferAttachmentParameteriv(GL_DRAW_FRAMEBUFFER, GL_STENCIL_ATTACHMENT, GL_FRAMEBUFFER_ATTACHMENT_OBJECT_TYPE, &object_type);
 941         if (object_type == GL_RENDERBUFFER) {
 942             glGetFramebufferAttachmentParameteriv(GL_DRAW_FRAMEBUFFER, GL_STENCIL_ATTACHMENT, GL_FRAMEBUFFER_ATTACHMENT_OBJECT_NAME, &stencilRb);
 943             glBindRenderbuffer(GL_RENDERBUFFER, stencilRb);
 944             GLint samples = 0;
 945             glGetRenderbufferParameteriv(GL_RENDERBUFFER, GL_RENDERBUFFER_SAMPLES, &samples);
 946             if (samples) {
 947                 multisample = true;
 948             }
 949         }
 950
 951         glBindRenderbuffer(GL_RENDERBUFFER, boundRb);
 952
 953         GLuint rbs[3];
 954         GLint numRbs = 0;
 955         GLuint fboCopy = 0;
 956
 957         if (multisample) {
 958             // glReadPixels doesnt support multisampled buffers so we need
 959             // to blit the fbo to a temporary one
 960             fboCopy = downsampledFramebuffer(boundDrawFbo, draw_buffer0,
 961                                              colorRb, depthRb, stencilRb,
 962                                              rbs, &numRbs);
 963         }
 964
 965         dumpFramebufferAttachments(json, GL_DRAW_FRAMEBUFFER);
 966
 967         if (multisample) {
 968             glBindRenderbuffer(GL_RENDERBUFFER_BINDING, boundRb);
 969             glDeleteRenderbuffers(numRbs, rbs);
 970             glDeleteFramebuffers(1, &fboCopy);
 971         }
 972
 973         glBindFramebuffer(GL_READ_FRAMEBUFFER, boundReadFbo);
 974         glBindFramebuffer(GL_DRAW_FRAMEBUFFER, boundDrawFbo);
 975     }
 976
 977     json.endObject();
 978     json.endMember(); // framebuffer
 979 }
 980
 981
 982 static const GLenum bindings[] = {
 983     GL_DRAW_BUFFER,
 984     GL_READ_BUFFER,
 985     GL_PIXEL_PACK_BUFFER_BINDING,
 986     GL_PIXEL_UNPACK_BUFFER_BINDING,
 987     GL_TEXTURE_BINDING_1D,
 988     GL_TEXTURE_BINDING_2D,
 989     GL_TEXTURE_BINDING_3D,
 990     GL_TEXTURE_BINDING_RECTANGLE,
 991     GL_TEXTURE_BINDING_CUBE_MAP,
 992     GL_DRAW_FRAMEBUFFER_BINDING,
 993     GL_READ_FRAMEBUFFER_BINDING,
 994     GL_RENDERBUFFER_BINDING,
 995     GL_DRAW_BUFFER0,
 996     GL_DRAW_BUFFER1,
 997     GL_DRAW_BUFFER2,
 998     GL_DRAW_BUFFER3,
 999     GL_DRAW_BUFFER4,
1000     GL_DRAW_BUFFER5,
1001     GL_DRAW_BUFFER6,
1002     GL_DRAW_BUFFER7,
1003 };
1004
1005
1006 #define NUM_BINDINGS sizeof(bindings)/sizeof(bindings[0])
1007
1008
1009 void dumpCurrentContext(std::ostream &os)
1010 {
1011     JSONWriter json(os);
1012
1013 #ifndef NDEBUG
1014     GLint old_bindings[NUM_BINDINGS];
1015     for (unsigned i = 0; i < NUM_BINDINGS; ++i) {
1016         old_bindings[i] = 0;
1017         glGetIntegerv(bindings[i], &old_bindings[i]);
1018     }
1019 #endif
1020
1021     dumpParameters(json);
1022     dumpShaders(json);
1023     dumpTextures(json);
1024     dumpFramebuffer(json);
1025
1026 #ifndef NDEBUG
1027     for (unsigned i = 0; i < NUM_BINDINGS; ++i) {
1028         GLint new_binding = 0;
1029         glGetIntegerv(bindings[i], &new_binding);
1030         if (new_binding != old_bindings[i]) {
1031             std::cerr << "warning: " << enumToString(bindings[i]) << " was clobbered\n";
1032         }
1033     }
1034 #endif
1035
1036 }
1037
1038
1039 } /* namespace glstate */