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 Image::Image *
 429 getDrawBufferImage(GLenum format) {
 430     GLint channels = __gl_format_channels(format);
 431     if (channels > 4) {
 432         return NULL;
 433     }
 434
 435     GLint width, height;
 436     if (!getDrawableBounds(&width, &height)) {
 437         return NULL;
 438     }
 439
 440     Image::Image *image = new Image::Image(width, height, channels, true);
 441     if (!image) {
 442         return NULL;
 443     }
 444
 445     GLint draw_buffer = GL_NONE;
 446     GLint read_buffer = GL_NONE;
 447     glGetIntegerv(GL_DRAW_BUFFER, &draw_buffer);
 448     glGetIntegerv(GL_READ_BUFFER, &read_buffer);
 449     glReadBuffer(draw_buffer);
 450
 451     resetPixelPackState();
 452
 453     glReadPixels(0, 0, width, height, format, GL_UNSIGNED_BYTE, image->pixels);
 454
 455     restorePixelPackState();
 456     glReadBuffer(read_buffer);
 457
 458     return image;
 459 }
 460
 461
 462 /**
 463  * Dump the image of the currently bound read buffer.
 464  */
 465 static inline void
 466 dumpReadBufferImage(JSONWriter &json, GLint width, GLint height, GLenum format)
 467 {
 468     GLint channels = __gl_format_channels(format);
 469
 470     json.beginObject();
 471
 472     // Tell the GUI this is no ordinary object, but an image
 473     json.writeStringMember("__class__", "image");
 474
 475     json.writeNumberMember("__width__", width);
 476     json.writeNumberMember("__height__", height);
 477     json.writeNumberMember("__depth__", 1);
 478
 479     // Hardcoded for now, but we could chose types more adequate to the
 480     // texture internal format
 481     json.writeStringMember("__type__", "uint8");
 482     json.writeBoolMember("__normalized__", true);
 483     json.writeNumberMember("__channels__", channels);
 484
 485     GLubyte *pixels = new GLubyte[width*height*channels];
 486
 487     resetPixelPackState();
 488
 489     glReadPixels(0, 0, width, height, format, GL_UNSIGNED_BYTE, pixels);
 490
 491     restorePixelPackState();
 492
 493     json.beginMember("__data__");
 494     char *pngBuffer;
 495     int pngBufferSize;
 496     Image::writePixelsToBuffer(pixels, width, height, channels, false, &pngBuffer, &pngBufferSize);
 497     //std::cerr <<" Before = "<<(width * height * channels * sizeof *pixels)
 498     //          <<", after = "<<pngBufferSize << ", ratio = " << double(width * height * channels * sizeof *pixels)/pngBufferSize;
 499     json.writeBase64(pngBuffer, pngBufferSize);
 500     free(pngBuffer);
 501     json.endMember(); // __data__
 502
 503     delete [] pixels;
 504     json.endObject();
 505 }
 506
 507
 508 static inline GLuint
 509 downsampledFramebuffer(GLuint oldFbo, GLint drawbuffer,
 510                        GLint colorRb, GLint depthRb, GLint stencilRb,
 511                        GLuint *rbs, GLint *numRbs)
 512 {
 513     GLuint fbo;
 514     GLint format;
 515     GLint w, h;
 516
 517     *numRbs = 0;
 518
 519     glGenFramebuffers(1, &fbo);
 520     glBindFramebuffer(GL_FRAMEBUFFER, fbo);
 521
 522     glBindRenderbuffer(GL_RENDERBUFFER, colorRb);
 523     glGetRenderbufferParameteriv(GL_RENDERBUFFER,
 524                                  GL_RENDERBUFFER_WIDTH, &w);
 525     glGetRenderbufferParameteriv(GL_RENDERBUFFER,
 526                                  GL_RENDERBUFFER_HEIGHT, &h);
 527     glGetRenderbufferParameteriv(GL_RENDERBUFFER,
 528                                  GL_RENDERBUFFER_INTERNAL_FORMAT, &format);
 529
 530     glGenRenderbuffers(1, &rbs[*numRbs]);
 531     glBindRenderbuffer(GL_RENDERBUFFER, rbs[*numRbs]);
 532     glRenderbufferStorage(GL_RENDERBUFFER, format, w, h);
 533     glFramebufferRenderbuffer(GL_FRAMEBUFFER, drawbuffer,
 534                               GL_RENDERBUFFER, rbs[*numRbs]);
 535
 536     glBindFramebuffer(GL_READ_FRAMEBUFFER, oldFbo);
 537     glBindFramebuffer(GL_DRAW_FRAMEBUFFER, fbo);
 538     glDrawBuffer(drawbuffer);
 539     glReadBuffer(drawbuffer);
 540     glBlitFramebuffer(0, 0, w, h, 0, 0, w, h,
 541                       GL_COLOR_BUFFER_BIT, GL_NEAREST);
 542     glBindFramebuffer(GL_FRAMEBUFFER, fbo);
 543     ++*numRbs;
 544
 545     if (stencilRb == depthRb && stencilRb) {
 546         //combined depth and stencil buffer
 547         glBindRenderbuffer(GL_RENDERBUFFER, depthRb);
 548         glGetRenderbufferParameteriv(GL_RENDERBUFFER,
 549                                      GL_RENDERBUFFER_WIDTH, &w);
 550         glGetRenderbufferParameteriv(GL_RENDERBUFFER,
 551                                      GL_RENDERBUFFER_HEIGHT, &h);
 552         glGetRenderbufferParameteriv(GL_RENDERBUFFER,
 553                                      GL_RENDERBUFFER_INTERNAL_FORMAT, &format);
 554
 555         glGenRenderbuffers(1, &rbs[*numRbs]);
 556         glBindRenderbuffer(GL_RENDERBUFFER, rbs[*numRbs]);
 557         glRenderbufferStorage(GL_RENDERBUFFER, format, w, h);
 558         glFramebufferRenderbuffer(GL_FRAMEBUFFER, GL_DEPTH_STENCIL_ATTACHMENT,
 559                                   GL_RENDERBUFFER, rbs[*numRbs]);
 560         glBindFramebuffer(GL_READ_FRAMEBUFFER, oldFbo);
 561         glBindFramebuffer(GL_DRAW_FRAMEBUFFER, fbo);
 562         glBlitFramebuffer(0, 0, w, h, 0, 0, w, h,
 563                           GL_DEPTH_BUFFER_BIT | GL_STENCIL_BUFFER_BIT, GL_NEAREST);
 564         glBindFramebuffer(GL_FRAMEBUFFER, fbo);
 565         ++*numRbs;
 566     } else {
 567         if (depthRb) {
 568             glBindRenderbuffer(GL_RENDERBUFFER, depthRb);
 569             glGetRenderbufferParameteriv(GL_RENDERBUFFER,
 570                                          GL_RENDERBUFFER_WIDTH, &w);
 571             glGetRenderbufferParameteriv(GL_RENDERBUFFER,
 572                                          GL_RENDERBUFFER_HEIGHT, &h);
 573             glGetRenderbufferParameteriv(GL_RENDERBUFFER,
 574                                          GL_RENDERBUFFER_INTERNAL_FORMAT, &format);
 575
 576             glGenRenderbuffers(1, &rbs[*numRbs]);
 577             glBindRenderbuffer(GL_RENDERBUFFER, rbs[*numRbs]);
 578             glRenderbufferStorage(GL_RENDERBUFFER, format, w, h);
 579             glFramebufferRenderbuffer(GL_FRAMEBUFFER,
 580                                       GL_DEPTH_ATTACHMENT,
 581                                       GL_RENDERBUFFER, rbs[*numRbs]);
 582             glBindFramebuffer(GL_READ_FRAMEBUFFER, oldFbo);
 583             glBindFramebuffer(GL_DRAW_FRAMEBUFFER, fbo);
 584             glDrawBuffer(GL_DEPTH_ATTACHMENT);
 585             glReadBuffer(GL_DEPTH_ATTACHMENT);
 586             glBlitFramebuffer(0, 0, w, h, 0, 0, w, h,
 587                               GL_DEPTH_BUFFER_BIT, GL_NEAREST);
 588             ++*numRbs;
 589         }
 590         if (stencilRb) {
 591             glBindRenderbuffer(GL_RENDERBUFFER, stencilRb);
 592             glGetRenderbufferParameteriv(GL_RENDERBUFFER,
 593                                          GL_RENDERBUFFER_WIDTH, &w);
 594             glGetRenderbufferParameteriv(GL_RENDERBUFFER,
 595                                          GL_RENDERBUFFER_HEIGHT, &h);
 596             glGetRenderbufferParameteriv(GL_RENDERBUFFER,
 597                                      GL_RENDERBUFFER_INTERNAL_FORMAT, &format);
 598
 599             glGenRenderbuffers(1, &rbs[*numRbs]);
 600             glBindRenderbuffer(GL_RENDERBUFFER, rbs[*numRbs]);
 601             glRenderbufferStorage(GL_RENDERBUFFER, format, w, h);
 602             glFramebufferRenderbuffer(GL_FRAMEBUFFER,
 603                                       GL_STENCIL_ATTACHMENT,
 604                                       GL_RENDERBUFFER, rbs[*numRbs]);
 605             glBindFramebuffer(GL_READ_FRAMEBUFFER, oldFbo);
 606             glBindFramebuffer(GL_DRAW_FRAMEBUFFER, fbo);
 607             glDrawBuffer(GL_STENCIL_ATTACHMENT);
 608             glReadBuffer(GL_STENCIL_ATTACHMENT);
 609             glBlitFramebuffer(0, 0, w, h, 0, 0, w, h,
 610                               GL_STENCIL_BUFFER_BIT, GL_NEAREST);
 611             ++*numRbs;
 612         }
 613     }
 614
 615     return fbo;
 616 }
 617
 618
 619 /**
 620  * Dump images of current draw drawable/window.
 621  */
 622 static void
 623 dumpDrawableImages(JSONWriter &json)
 624 {
 625     GLint width, height;
 626
 627     if (!getDrawableBounds(&width, &height)) {
 628         return;
 629     }
 630
 631     GLint draw_buffer = GL_NONE;
 632     glGetIntegerv(GL_DRAW_BUFFER, &draw_buffer);
 633     glReadBuffer(draw_buffer);
 634
 635     if (draw_buffer != GL_NONE) {
 636         GLint read_buffer = GL_NONE;
 637         glGetIntegerv(GL_READ_BUFFER, &read_buffer);
 638
 639         GLint alpha_bits = 0;
 640         glGetIntegerv(GL_ALPHA_BITS, &alpha_bits);
 641         GLenum format = alpha_bits ? GL_RGBA : GL_RGB;
 642         json.beginMember(enumToString(draw_buffer));
 643         dumpReadBufferImage(json, width, height, format);
 644         json.endMember();
 645
 646         glReadBuffer(read_buffer);
 647     }
 648
 649     GLint depth_bits = 0;
 650     glGetIntegerv(GL_DEPTH_BITS, &depth_bits);
 651     if (depth_bits) {
 652         json.beginMember("GL_DEPTH_COMPONENT");
 653         dumpReadBufferImage(json, width, height, GL_DEPTH_COMPONENT);
 654         json.endMember();
 655     }
 656
 657     GLint stencil_bits = 0;
 658     glGetIntegerv(GL_STENCIL_BITS, &stencil_bits);
 659     if (stencil_bits) {
 660         json.beginMember("GL_STENCIL_INDEX");
 661         dumpReadBufferImage(json, width, height, GL_STENCIL_INDEX);
 662         json.endMember();
 663     }
 664 }
 665
 666
 667 static const GLenum texture_bindings[][2] = {
 668     {GL_TEXTURE_1D, GL_TEXTURE_BINDING_1D},
 669     {GL_TEXTURE_2D, GL_TEXTURE_BINDING_2D},
 670     {GL_TEXTURE_3D, GL_TEXTURE_BINDING_3D},
 671     {GL_TEXTURE_RECTANGLE, GL_TEXTURE_BINDING_RECTANGLE},
 672     {GL_TEXTURE_CUBE_MAP, GL_TEXTURE_BINDING_CUBE_MAP}
 673 };
 674
 675
 676 static bool
 677 bindTexture(GLint texture, GLenum &target, GLint &bound_texture)
 678 {
 679
 680     for (unsigned i = 0; i < sizeof(texture_bindings)/sizeof(texture_bindings[0]); ++i) {
 681         target  = texture_bindings[i][0];
 682
 683         GLenum binding = texture_bindings[i][1];
 684
 685         while (glGetError() != GL_NO_ERROR)
 686             ;
 687
 688         glGetIntegerv(binding, &bound_texture);
 689         glBindTexture(target, texture);
 690
 691         if (glGetError() == GL_NO_ERROR) {
 692             return true;
 693         }
 694
 695         glBindTexture(target, bound_texture);
 696     }
 697
 698     target = GL_NONE;
 699
 700     return false;
 701 }
 702
 703
 704 static bool
 705 getTextureLevelSize(GLint texture, GLint level, GLint *width, GLint *height)
 706 {
 707     *width = 0;
 708     *height = 0;
 709
 710     GLenum target;
 711     GLint bound_texture = 0;
 712     if (!bindTexture(texture, target, bound_texture)) {
 713         return false;
 714     }
 715
 716     glGetTexLevelParameteriv(target, level, GL_TEXTURE_WIDTH, width);
 717     glGetTexLevelParameteriv(target, level, GL_TEXTURE_HEIGHT, height);
 718
 719     glBindTexture(target, bound_texture);
 720
 721     return *width > 0 && *height > 0;
 722 }
 723
 724
 725 /**
 726  * Dump the specified framebuffer attachment.
 727  *
 728  * In the case of a color attachment, it assumes it is already bound for read.
 729  */
 730 static void
 731 dumpFramebufferAttachment(JSONWriter &json, GLenum target, GLenum attachment, GLenum format)
 732 {
 733     GLint width = 0;
 734     GLint height = 0;
 735
 736     GLint object_type = GL_NONE;
 737     glGetFramebufferAttachmentParameteriv(target, attachment,
 738                                           GL_FRAMEBUFFER_ATTACHMENT_OBJECT_TYPE,
 739                                           &object_type);
 740     if (object_type == GL_NONE) {
 741         return;
 742     }
 743
 744     GLint object_name = 0;
 745     glGetFramebufferAttachmentParameteriv(target, attachment,
 746                                           GL_FRAMEBUFFER_ATTACHMENT_OBJECT_NAME,
 747                                           &object_name);
 748     if (object_name == 0) {
 749         return;
 750     }
 751
 752     if (object_type == GL_RENDERBUFFER) {
 753         GLint bound_renderbuffer = 0;
 754         glGetIntegerv(GL_RENDERBUFFER_BINDING, &bound_renderbuffer);
 755
 756         glBindRenderbuffer(GL_RENDERBUFFER, object_name);
 757         glGetRenderbufferParameteriv(GL_RENDERBUFFER, GL_RENDERBUFFER_WIDTH, &width);
 758         glGetRenderbufferParameteriv(GL_RENDERBUFFER, GL_RENDERBUFFER_HEIGHT, &height);
 759
 760         if (width <= 0 || height <= 0) {
 761             return;
 762         }
 763
 764         glBindRenderbuffer(GL_RENDERBUFFER, bound_renderbuffer);
 765
 766     } else if (object_type == GL_TEXTURE) {
 767         GLint texture_level = 0;
 768         glGetFramebufferAttachmentParameteriv(target, attachment,
 769                                               GL_FRAMEBUFFER_ATTACHMENT_TEXTURE_LEVEL,
 770                                               &texture_level);
 771         if (!getTextureLevelSize(object_name, texture_level, &width, &height)) {
 772             return;
 773         }
 774     } else {
 775         std::cerr << "warning: unexpected GL_FRAMEBUFFER_ATTACHMENT_OBJECT_TYPE = " << object_type << "\n";
 776         return;
 777     }
 778
 779     json.beginMember(enumToString(attachment));
 780     dumpReadBufferImage(json, width, height, format);
 781     json.endMember();
 782 }
 783
 784
 785 static void
 786 dumpFramebufferAttachments(JSONWriter &json, GLenum target)
 787 {
 788     GLint read_framebuffer = 0;
 789     glGetIntegerv(GL_READ_FRAMEBUFFER_BINDING, &read_framebuffer);
 790
 791     GLint read_buffer = GL_NONE;
 792     glGetIntegerv(GL_READ_BUFFER, &read_buffer);
 793
 794     GLint max_draw_buffers = 1;
 795     glGetIntegerv(GL_MAX_DRAW_BUFFERS, &max_draw_buffers);
 796     GLint max_color_attachments = 0;
 797     glGetIntegerv(GL_MAX_COLOR_ATTACHMENTS, &max_color_attachments);
 798
 799     for (GLint i = 0; i < max_draw_buffers; ++i) {
 800         GLint draw_buffer = GL_NONE;
 801         glGetIntegerv(GL_DRAW_BUFFER0 + i, &draw_buffer);
 802         if (draw_buffer != GL_NONE) {
 803             glReadBuffer(draw_buffer);
 804             GLint attachment;
 805             if (draw_buffer >= GL_COLOR_ATTACHMENT0 && draw_buffer < GL_COLOR_ATTACHMENT0 + max_color_attachments) {
 806                 attachment = draw_buffer;
 807             } else {
 808                 std::cerr << "warning: unexpected GL_DRAW_BUFFER" << i << " = " << draw_buffer << "\n";
 809                 attachment = GL_COLOR_ATTACHMENT0;
 810             }
 811             GLint alpha_size = 0;
 812             glGetFramebufferAttachmentParameteriv(target, attachment,
 813                                                   GL_FRAMEBUFFER_ATTACHMENT_ALPHA_SIZE,
 814                                                   &alpha_size);
 815             GLenum format = alpha_size ? GL_RGBA : GL_RGB;
 816             dumpFramebufferAttachment(json, target, attachment, format);
 817         }
 818     }
 819
 820     glReadBuffer(read_buffer);
 821
 822     dumpFramebufferAttachment(json, target, GL_DEPTH_ATTACHMENT, GL_DEPTH_COMPONENT);
 823     dumpFramebufferAttachment(json, target, GL_STENCIL_ATTACHMENT, GL_STENCIL_INDEX);
 824
 825     glBindFramebuffer(GL_READ_FRAMEBUFFER, read_framebuffer);
 826 }
 827
 828
 829 static void
 830 dumpFramebuffer(JSONWriter &json)
 831 {
 832     json.beginMember("framebuffer");
 833     json.beginObject();
 834
 835     GLint boundDrawFbo = 0, boundReadFbo = 0;
 836     glGetIntegerv(GL_DRAW_FRAMEBUFFER_BINDING, &boundDrawFbo);
 837     glGetIntegerv(GL_READ_FRAMEBUFFER_BINDING, &boundReadFbo);
 838     if (!boundDrawFbo) {
 839         dumpDrawableImages(json);
 840     } else {
 841         GLint colorRb = 0, stencilRb = 0, depthRb = 0;
 842         GLint draw_buffer0 = GL_NONE;
 843         glGetIntegerv(GL_DRAW_BUFFER0, &draw_buffer0);
 844         bool multisample = false;
 845
 846         GLint boundRb = 0;
 847         glGetIntegerv(GL_RENDERBUFFER_BINDING, &boundRb);
 848
 849         GLint object_type;
 850         glGetFramebufferAttachmentParameteriv(GL_DRAW_FRAMEBUFFER, draw_buffer0, GL_FRAMEBUFFER_ATTACHMENT_OBJECT_TYPE, &object_type);
 851         if (object_type == GL_RENDERBUFFER) {
 852             glGetFramebufferAttachmentParameteriv(GL_DRAW_FRAMEBUFFER, draw_buffer0, GL_FRAMEBUFFER_ATTACHMENT_OBJECT_NAME, &colorRb);
 853             glBindRenderbuffer(GL_RENDERBUFFER, colorRb);
 854             GLint samples = 0;
 855             glGetRenderbufferParameteriv(GL_RENDERBUFFER, GL_RENDERBUFFER_SAMPLES, &samples);
 856             if (samples) {
 857                 multisample = true;
 858             }
 859         }
 860
 861         glGetFramebufferAttachmentParameteriv(GL_DRAW_FRAMEBUFFER, GL_DEPTH_ATTACHMENT, GL_FRAMEBUFFER_ATTACHMENT_OBJECT_TYPE, &object_type);
 862         if (object_type == GL_RENDERBUFFER) {
 863             glGetFramebufferAttachmentParameteriv(GL_DRAW_FRAMEBUFFER, GL_DEPTH_ATTACHMENT, GL_FRAMEBUFFER_ATTACHMENT_OBJECT_NAME, &depthRb);
 864             glBindRenderbuffer(GL_RENDERBUFFER, depthRb);
 865             GLint samples = 0;
 866             glGetRenderbufferParameteriv(GL_RENDERBUFFER, GL_RENDERBUFFER_SAMPLES, &samples);
 867             if (samples) {
 868                 multisample = true;
 869             }
 870         }
 871
 872         glGetFramebufferAttachmentParameteriv(GL_DRAW_FRAMEBUFFER, GL_STENCIL_ATTACHMENT, GL_FRAMEBUFFER_ATTACHMENT_OBJECT_TYPE, &object_type);
 873         if (object_type == GL_RENDERBUFFER) {
 874             glGetFramebufferAttachmentParameteriv(GL_DRAW_FRAMEBUFFER, GL_STENCIL_ATTACHMENT, GL_FRAMEBUFFER_ATTACHMENT_OBJECT_NAME, &stencilRb);
 875             glBindRenderbuffer(GL_RENDERBUFFER, stencilRb);
 876             GLint samples = 0;
 877             glGetRenderbufferParameteriv(GL_RENDERBUFFER, GL_RENDERBUFFER_SAMPLES, &samples);
 878             if (samples) {
 879                 multisample = true;
 880             }
 881         }
 882
 883         glBindRenderbuffer(GL_RENDERBUFFER, boundRb);
 884
 885         GLuint rbs[3];
 886         GLint numRbs = 0;
 887         GLuint fboCopy = 0;
 888
 889         if (multisample) {
 890             // glReadPixels doesnt support multisampled buffers so we need
 891             // to blit the fbo to a temporary one
 892             fboCopy = downsampledFramebuffer(boundDrawFbo, draw_buffer0,
 893                                              colorRb, depthRb, stencilRb,
 894                                              rbs, &numRbs);
 895         }
 896
 897         dumpFramebufferAttachments(json, GL_DRAW_FRAMEBUFFER);
 898
 899         if (multisample) {
 900             glBindRenderbuffer(GL_RENDERBUFFER_BINDING, boundRb);
 901             glDeleteRenderbuffers(numRbs, rbs);
 902             glDeleteFramebuffers(1, &fboCopy);
 903         }
 904
 905         glBindFramebuffer(GL_READ_FRAMEBUFFER, boundReadFbo);
 906         glBindFramebuffer(GL_DRAW_FRAMEBUFFER, boundDrawFbo);
 907     }
 908
 909     json.endObject();
 910     json.endMember(); // framebuffer
 911 }
 912
 913
 914 void dumpCurrentContext(std::ostream &os)
 915 {
 916     JSONWriter json(os);
 917     dumpParameters(json);
 918     dumpShaders(json);
 919     dumpTextures(json);
 920     dumpFramebuffer(json);
 921 }
 922
 923
 924 } /* namespace glstate */