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[apitrace] / 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 typedef int CGSConnectionID;
47 typedef int CGSWindowID;
48 typedef int CGSSurfaceID;
49
50 CGLError CGLGetSurface(CGLContextObj, CGSConnectionID*, CGSWindowID*, CGSSurfaceID*);
51 OSStatus CGSGetSurfaceBounds(CGSConnectionID, CGWindowID, CGSSurfaceID, CGRect *);
52
53 #ifdef __cplusplus
54 }
55 #endif
56
57 #endif /* __APPLE__ */
58
59
60 namespace glstate {
61
62
63 static void
64 dumpShader(JSONWriter &json, GLuint shader)
65 {
66     if (!shader) {
67         return;
68     }
69
70     GLint shader_type = 0;
71     glGetShaderiv(shader, GL_SHADER_TYPE, &shader_type);
72     if (!shader_type) {
73         return;
74     }
75
76     GLint source_length = 0;
77     glGetShaderiv(shader, GL_SHADER_SOURCE_LENGTH, &source_length);
78     if (!source_length) {
79         return;
80     }
81
82     GLchar *source = new GLchar[source_length];
83     GLsizei length = 0;
84     source[0] = 0;
85     glGetShaderSource(shader, source_length, &length, source);
86
87     json.beginMember(enumToString(shader_type));
88     json.writeString(source);
89     json.endMember();
90
91     delete [] source;
92 }
93
94
95 static void
96 dumpShaderObj(JSONWriter &json, GLhandleARB shaderObj)
97 {
98     if (!shaderObj) {
99         return;
100     }
101
102     GLint shader_type = 0;
103     glGetObjectParameterivARB(shaderObj, GL_OBJECT_TYPE_ARB, &shader_type);
104     if (!shader_type) {
105         return;
106     }
107
108     GLint source_length = 0;
109     glGetObjectParameterivARB(shaderObj, GL_OBJECT_SHADER_SOURCE_LENGTH_ARB, &source_length);
110     if (!source_length) {
111         return;
112     }
113
114     GLcharARB *source = new GLcharARB[source_length];
115     GLsizei length = 0;
116     source[0] = 0;
117     glGetShaderSource(shaderObj, source_length, &length, source);
118
119     json.beginMember(enumToString(shader_type));
120     json.writeString(source);
121     json.endMember();
122
123     delete [] source;
124 }
125
126
127 static inline void
128 dumpCurrentProgram(JSONWriter &json)
129 {
130     GLint program = 0;
131     glGetIntegerv(GL_CURRENT_PROGRAM, &program);
132     if (!program) {
133         return;
134     }
135
136     GLint attached_shaders = 0;
137     glGetProgramiv(program, GL_ATTACHED_SHADERS, &attached_shaders);
138     if (!attached_shaders) {
139         return;
140     }
141
142     GLuint *shaders = new GLuint[attached_shaders];
143     GLsizei count = 0;
144     glGetAttachedShaders(program, attached_shaders, &count, shaders);
145     for (GLsizei i = 0; i < count; ++ i) {
146        dumpShader(json, shaders[i]);
147     }
148     delete [] shaders;
149 }
150
151
152 static inline void
153 dumpCurrentProgramObj(JSONWriter &json)
154 {
155     GLhandleARB programObj = glGetHandleARB(GL_PROGRAM_OBJECT_ARB);
156     if (!programObj) {
157         return;
158     }
159
160     GLint attached_shaders = 0;
161     glGetProgramivARB(programObj, GL_OBJECT_ATTACHED_OBJECTS_ARB, &attached_shaders);
162     if (!attached_shaders) {
163         return;
164     }
165
166     GLhandleARB *shaderObjs = new GLhandleARB[attached_shaders];
167     GLsizei count = 0;
168     glGetAttachedObjectsARB(programObj, attached_shaders, &count, shaderObjs);
169     for (GLsizei i = 0; i < count; ++ i) {
170        dumpShaderObj(json, shaderObjs[i]);
171     }
172     delete [] shaderObjs;
173 }
174
175
176 static inline void
177 dumpArbProgram(JSONWriter &json, GLenum target)
178 {
179     if (!glIsEnabled(target)) {
180         return;
181     }
182
183     GLint program_length = 0;
184     glGetProgramivARB(target, GL_PROGRAM_LENGTH_ARB, &program_length);
185     if (!program_length) {
186         return;
187     }
188
189     GLchar *source = new GLchar[program_length + 1];
190     source[0] = 0;
191     glGetProgramStringARB(target, GL_PROGRAM_STRING_ARB, source);
192     source[program_length] = 0;
193
194     json.beginMember(enumToString(target));
195     json.writeString(source);
196     json.endMember();
197
198     delete [] source;
199 }
200
201
202 static inline void
203 dumpShaders(JSONWriter &json)
204 {
205     json.beginMember("shaders");
206     json.beginObject();
207     dumpCurrentProgram(json);
208     dumpArbProgram(json, GL_FRAGMENT_PROGRAM_ARB);
209     dumpArbProgram(json, GL_VERTEX_PROGRAM_ARB);
210     json.endObject();
211     json.endMember(); //shaders
212 }
213
214
215 static inline void
216 dumpTextureImage(JSONWriter &json, GLenum target, GLint level)
217 {
218     GLint width, height = 1, depth = 1;
219
220     width = 0;
221     glGetTexLevelParameteriv(target, level, GL_TEXTURE_WIDTH, &width);
222
223     if (target != GL_TEXTURE_1D) {
224         height = 0;
225         glGetTexLevelParameteriv(target, level, GL_TEXTURE_HEIGHT, &height);
226         if (target == GL_TEXTURE_3D) {
227             depth = 0;
228             glGetTexLevelParameteriv(target, level, GL_TEXTURE_DEPTH, &depth);
229         }
230     }
231
232     if (width <= 0 || height <= 0 || depth <= 0) {
233         return;
234     } else {
235         char label[512];
236
237         GLint active_texture = GL_TEXTURE0;
238         glGetIntegerv(GL_ACTIVE_TEXTURE, &active_texture);
239         snprintf(label, sizeof label, "%s, %s, level = %i", enumToString(active_texture), enumToString(target), level);
240
241         json.beginMember(label);
242
243         json.beginObject();
244
245         // Tell the GUI this is no ordinary object, but an image
246         json.writeStringMember("__class__", "image");
247
248         json.writeNumberMember("__width__", width);
249         json.writeNumberMember("__height__", height);
250         json.writeNumberMember("__depth__", depth);
251
252         // Hardcoded for now, but we could chose types more adequate to the
253         // texture internal format
254         json.writeStringMember("__type__", "uint8");
255         json.writeBoolMember("__normalized__", true);
256         json.writeNumberMember("__channels__", 4);
257
258         GLubyte *pixels = new GLubyte[depth*width*height*4];
259
260         glGetTexImage(target, level, GL_RGBA, GL_UNSIGNED_BYTE, pixels);
261
262         json.beginMember("__data__");
263         char *pngBuffer;
264         int pngBufferSize;
265         Image::writePixelsToBuffer(pixels, width, height, 4, false, &pngBuffer, &pngBufferSize);
266         json.writeBase64(pngBuffer, pngBufferSize);
267         free(pngBuffer);
268         json.endMember(); // __data__
269
270         delete [] pixels;
271         json.endObject();
272     }
273 }
274
275
276 static inline void
277 dumpTexture(JSONWriter &json, GLenum target, GLenum binding)
278 {
279     GLint texture_binding = 0;
280     glGetIntegerv(binding, &texture_binding);
281     if (!glIsEnabled(target) && !texture_binding) {
282         return;
283     }
284
285     GLint level = 0;
286     do {
287         GLint width = 0, height = 0;
288         glGetTexLevelParameteriv(target, level, GL_TEXTURE_WIDTH, &width);
289         glGetTexLevelParameteriv(target, level, GL_TEXTURE_HEIGHT, &height);
290         if (!width || !height) {
291             break;
292         }
293
294         if (target == GL_TEXTURE_CUBE_MAP) {
295             for (int face = 0; face < 6; ++face) {
296                 dumpTextureImage(json, GL_TEXTURE_CUBE_MAP_POSITIVE_X + face, level);
297             }
298         } else {
299             dumpTextureImage(json, target, level);
300         }
301
302         ++level;
303     } while(true);
304 }
305
306
307 static inline void
308 dumpTextures(JSONWriter &json)
309 {
310     json.beginMember("textures");
311     json.beginObject();
312     GLint active_texture = GL_TEXTURE0;
313     glGetIntegerv(GL_ACTIVE_TEXTURE, &active_texture);
314     GLint max_texture_coords = 0;
315     glGetIntegerv(GL_MAX_TEXTURE_COORDS, &max_texture_coords);
316     GLint max_combined_texture_image_units = 0;
317     glGetIntegerv(GL_MAX_COMBINED_TEXTURE_IMAGE_UNITS, &max_combined_texture_image_units);
318     GLint max_units = std::max(max_combined_texture_image_units, max_texture_coords);
319     for (GLint unit = 0; unit < max_units; ++unit) {
320         GLenum texture = GL_TEXTURE0 + unit;
321         glActiveTexture(texture);
322         dumpTexture(json, GL_TEXTURE_1D, GL_TEXTURE_BINDING_1D);
323         dumpTexture(json, GL_TEXTURE_2D, GL_TEXTURE_BINDING_2D);
324         dumpTexture(json, GL_TEXTURE_3D, GL_TEXTURE_BINDING_3D);
325         dumpTexture(json, GL_TEXTURE_RECTANGLE, GL_TEXTURE_BINDING_RECTANGLE);
326         dumpTexture(json, GL_TEXTURE_CUBE_MAP, GL_TEXTURE_BINDING_CUBE_MAP);
327     }
328     glActiveTexture(active_texture);
329     json.endObject();
330     json.endMember(); // textures
331 }
332
333
334 static bool
335 getDrawableBounds(GLint *width, GLint *height) {
336 #if defined(_WIN32)
337
338     HDC hDC = wglGetCurrentDC();
339     if (!hDC) {
340         return false;
341     }
342
343     HWND hWnd = WindowFromDC(hDC);
344     RECT rect;
345
346     if (!GetClientRect(hWnd, &rect)) {
347        return false;
348     }
349
350     *width  = rect.right  - rect.left;
351     *height = rect.bottom - rect.top;
352
353 #elif defined(__APPLE__)
354
355     CGLContextObj ctx = CGLGetCurrentContext();
356     if (ctx == NULL) {
357         return false;
358     }
359
360     CGSConnectionID cid;
361     CGSWindowID wid;
362     CGSSurfaceID sid;
363
364     if (CGLGetSurface(ctx, &cid, &wid, &sid) != kCGLNoError) {
365         return false;
366     }
367
368     CGRect rect;
369
370     if (CGSGetSurfaceBounds(cid, wid, sid, &rect) != 0) {
371         return false;
372     }
373
374     *width = rect.size.width;
375     *height = rect.size.height;
376
377 #else
378
379     Display *display;
380     Drawable drawable;
381     Window root;
382     int x, y;
383     unsigned int w, h, bw, depth;
384
385     display = glXGetCurrentDisplay();
386     if (!display) {
387         return false;
388     }
389
390     drawable = glXGetCurrentDrawable();
391     if (drawable == None) {
392         return false;
393     }
394
395     if (!XGetGeometry(display, drawable, &root, &x, &y, &w, &h, &bw, &depth)) {
396         return false;
397     }
398
399     *width = w;
400     *height = h;
401
402 #endif
403
404     return true;
405 }
406
407
408 Image::Image *
409 getDrawBufferImage(GLenum format) {
410     GLint width, height;
411
412     if (format != GL_RGBA) {
413         // FIXME: this function can only handle 4-channel images
414         return NULL;
415     }
416
417     if (!getDrawableBounds(&width, &height)) {
418         return NULL;
419     }
420
421     Image::Image *image = new Image::Image(width, height, true);
422     if (!image) {
423         return NULL;
424     }
425
426     GLint drawbuffer = GL_NONE;
427     GLint readbuffer = GL_NONE;
428     glGetIntegerv(GL_DRAW_BUFFER, &drawbuffer);
429     glGetIntegerv(GL_READ_BUFFER, &readbuffer);
430     glReadBuffer(drawbuffer);
431
432     glPushClientAttrib(GL_CLIENT_PIXEL_STORE_BIT);
433     glPixelStorei(GL_PACK_SWAP_BYTES, GL_FALSE);
434     glPixelStorei(GL_PACK_LSB_FIRST, GL_FALSE);
435     glPixelStorei(GL_PACK_ROW_LENGTH, 0);
436     glPixelStorei(GL_PACK_IMAGE_HEIGHT, 0);
437     glPixelStorei(GL_PACK_SKIP_ROWS, 0);
438     glPixelStorei(GL_PACK_SKIP_PIXELS, 0);
439     glPixelStorei(GL_PACK_SKIP_IMAGES, 0);
440     glPixelStorei(GL_PACK_ALIGNMENT, 1);
441
442     glReadPixels(0, 0, width, height, GL_RGBA, GL_UNSIGNED_BYTE, image->pixels);
443
444     glPopClientAttrib();
445
446     glReadBuffer(readbuffer);
447
448     return image;
449 }
450
451
452 static inline void
453 dumpDrawBufferImage(JSONWriter &json, GLenum format)
454 {
455     GLint channels = __gl_format_channels(format);
456
457     GLint width, height;
458
459     if (!getDrawableBounds(&width, &height)) {
460         json.writeNull();
461     } else {
462         json.beginObject();
463
464         // Tell the GUI this is no ordinary object, but an image
465         json.writeStringMember("__class__", "image");
466
467         json.writeNumberMember("__width__", width);
468         json.writeNumberMember("__height__", height);
469         json.writeNumberMember("__depth__", 1);
470
471         // Hardcoded for now, but we could chose types more adequate to the
472         // texture internal format
473         json.writeStringMember("__type__", "uint8");
474         json.writeBoolMember("__normalized__", true);
475         json.writeNumberMember("__channels__", channels);
476
477         GLubyte *pixels = new GLubyte[width*height*channels];
478
479         GLint drawbuffer = GL_NONE;
480         GLint readbuffer = GL_NONE;
481         glGetIntegerv(GL_DRAW_BUFFER, &drawbuffer);
482         glGetIntegerv(GL_READ_BUFFER, &readbuffer);
483         glReadBuffer(drawbuffer);
484
485         glPushClientAttrib(GL_CLIENT_PIXEL_STORE_BIT);
486         glPixelStorei(GL_PACK_SWAP_BYTES, GL_FALSE);
487         glPixelStorei(GL_PACK_LSB_FIRST, GL_FALSE);
488         glPixelStorei(GL_PACK_ROW_LENGTH, 0);
489         glPixelStorei(GL_PACK_IMAGE_HEIGHT, 0);
490         glPixelStorei(GL_PACK_SKIP_ROWS, 0);
491         glPixelStorei(GL_PACK_SKIP_PIXELS, 0);
492         glPixelStorei(GL_PACK_SKIP_IMAGES, 0);
493         glPixelStorei(GL_PACK_ALIGNMENT, 1);
494
495         glReadPixels(0, 0, width, height, format, GL_UNSIGNED_BYTE, pixels);
496
497         glPopClientAttrib();
498         glReadBuffer(readbuffer);
499
500         json.beginMember("__data__");
501         char *pngBuffer;
502         int pngBufferSize;
503         Image::writePixelsToBuffer(pixels, width, height, channels, false, &pngBuffer, &pngBufferSize);
504         //std::cerr <<" Before = "<<(width * height * channels * sizeof *pixels)
505         //          <<", after = "<<pngBufferSize << ", ratio = " << double(width * height * channels * sizeof *pixels)/pngBufferSize;
506         json.writeBase64(pngBuffer, pngBufferSize);
507         free(pngBuffer);
508         json.endMember(); // __data__
509
510         delete [] pixels;
511         json.endObject();
512     }
513 }
514
515
516 static inline GLuint
517 downsampledFramebuffer(GLuint oldFbo, GLint drawbuffer,
518                        GLint colorRb, GLint depthRb, GLint stencilRb,
519                        GLuint *rbs, GLint *numRbs)
520 {
521     GLuint fbo;
522     GLint format;
523     GLint w, h;
524
525     *numRbs = 0;
526
527     glGenFramebuffers(1, &fbo);
528     glBindFramebuffer(GL_FRAMEBUFFER, fbo);
529
530     glBindRenderbuffer(GL_RENDERBUFFER, colorRb);
531     glGetRenderbufferParameteriv(GL_RENDERBUFFER,
532                                  GL_RENDERBUFFER_WIDTH, &w);
533     glGetRenderbufferParameteriv(GL_RENDERBUFFER,
534                                  GL_RENDERBUFFER_HEIGHT, &h);
535     glGetRenderbufferParameteriv(GL_RENDERBUFFER,
536                                  GL_RENDERBUFFER_INTERNAL_FORMAT, &format);
537
538     glGenRenderbuffers(1, &rbs[*numRbs]);
539     glBindRenderbuffer(GL_RENDERBUFFER, rbs[*numRbs]);
540     glRenderbufferStorage(GL_RENDERBUFFER, format, w, h);
541     glFramebufferRenderbuffer(GL_FRAMEBUFFER, drawbuffer,
542                               GL_RENDERBUFFER, rbs[*numRbs]);
543
544     glBindFramebuffer(GL_READ_FRAMEBUFFER, oldFbo);
545     glBindFramebuffer(GL_DRAW_FRAMEBUFFER, fbo);
546     glDrawBuffer(drawbuffer);
547     glReadBuffer(drawbuffer);
548     glBlitFramebuffer(0, 0, w, h, 0, 0, w, h,
549                       GL_COLOR_BUFFER_BIT, GL_NEAREST);
550     glBindFramebuffer(GL_FRAMEBUFFER, fbo);
551     ++*numRbs;
552
553     if (stencilRb == depthRb && stencilRb) {
554         //combined depth and stencil buffer
555         glBindRenderbuffer(GL_RENDERBUFFER, depthRb);
556         glGetRenderbufferParameteriv(GL_RENDERBUFFER,
557                                      GL_RENDERBUFFER_WIDTH, &w);
558         glGetRenderbufferParameteriv(GL_RENDERBUFFER,
559                                      GL_RENDERBUFFER_HEIGHT, &h);
560         glGetRenderbufferParameteriv(GL_RENDERBUFFER,
561                                      GL_RENDERBUFFER_INTERNAL_FORMAT, &format);
562
563         glGenRenderbuffers(1, &rbs[*numRbs]);
564         glBindRenderbuffer(GL_RENDERBUFFER, rbs[*numRbs]);
565         glRenderbufferStorage(GL_RENDERBUFFER, format, w, h);
566         glFramebufferRenderbuffer(GL_FRAMEBUFFER, GL_DEPTH_STENCIL_ATTACHMENT,
567                                   GL_RENDERBUFFER, rbs[*numRbs]);
568         glBindFramebuffer(GL_READ_FRAMEBUFFER, oldFbo);
569         glBindFramebuffer(GL_DRAW_FRAMEBUFFER, fbo);
570         glBlitFramebuffer(0, 0, w, h, 0, 0, w, h,
571                           GL_DEPTH_BUFFER_BIT | GL_STENCIL_BUFFER_BIT, GL_NEAREST);
572         glBindFramebuffer(GL_FRAMEBUFFER, fbo);
573         ++*numRbs;
574     } else {
575         if (depthRb) {
576             glBindRenderbuffer(GL_RENDERBUFFER, depthRb);
577             glGetRenderbufferParameteriv(GL_RENDERBUFFER,
578                                          GL_RENDERBUFFER_WIDTH, &w);
579             glGetRenderbufferParameteriv(GL_RENDERBUFFER,
580                                          GL_RENDERBUFFER_HEIGHT, &h);
581             glGetRenderbufferParameteriv(GL_RENDERBUFFER,
582                                          GL_RENDERBUFFER_INTERNAL_FORMAT, &format);
583
584             glGenRenderbuffers(1, &rbs[*numRbs]);
585             glBindRenderbuffer(GL_RENDERBUFFER, rbs[*numRbs]);
586             glRenderbufferStorage(GL_RENDERBUFFER, format, w, h);
587             glFramebufferRenderbuffer(GL_FRAMEBUFFER,
588                                       GL_DEPTH_ATTACHMENT,
589                                       GL_RENDERBUFFER, rbs[*numRbs]);
590             glBindFramebuffer(GL_READ_FRAMEBUFFER, oldFbo);
591             glBindFramebuffer(GL_DRAW_FRAMEBUFFER, fbo);
592             glDrawBuffer(GL_DEPTH_ATTACHMENT);
593             glReadBuffer(GL_DEPTH_ATTACHMENT);
594             glBlitFramebuffer(0, 0, w, h, 0, 0, w, h,
595                               GL_DEPTH_BUFFER_BIT, GL_NEAREST);
596             ++*numRbs;
597         }
598         if (stencilRb) {
599             glBindRenderbuffer(GL_RENDERBUFFER, stencilRb);
600             glGetRenderbufferParameteriv(GL_RENDERBUFFER,
601                                          GL_RENDERBUFFER_WIDTH, &w);
602             glGetRenderbufferParameteriv(GL_RENDERBUFFER,
603                                          GL_RENDERBUFFER_HEIGHT, &h);
604             glGetRenderbufferParameteriv(GL_RENDERBUFFER,
605                                      GL_RENDERBUFFER_INTERNAL_FORMAT, &format);
606
607             glGenRenderbuffers(1, &rbs[*numRbs]);
608             glBindRenderbuffer(GL_RENDERBUFFER, rbs[*numRbs]);
609             glRenderbufferStorage(GL_RENDERBUFFER, format, w, h);
610             glFramebufferRenderbuffer(GL_FRAMEBUFFER,
611                                       GL_STENCIL_ATTACHMENT,
612                                       GL_RENDERBUFFER, rbs[*numRbs]);
613             glBindFramebuffer(GL_READ_FRAMEBUFFER, oldFbo);
614             glBindFramebuffer(GL_DRAW_FRAMEBUFFER, fbo);
615             glDrawBuffer(GL_STENCIL_ATTACHMENT);
616             glReadBuffer(GL_STENCIL_ATTACHMENT);
617             glBlitFramebuffer(0, 0, w, h, 0, 0, w, h,
618                               GL_STENCIL_BUFFER_BIT, GL_NEAREST);
619             ++*numRbs;
620         }
621     }
622
623     return fbo;
624 }
625
626
627 static void
628 dumpDrawBuffers(JSONWriter &json, GLboolean dumpDepth, GLboolean dumpStencil)
629 {
630     json.beginMember("GL_RGBA");
631     dumpDrawBufferImage(json, GL_RGBA);
632     json.endMember();
633
634     if (dumpDepth) {
635         json.beginMember("GL_DEPTH_COMPONENT");
636         dumpDrawBufferImage(json, GL_DEPTH_COMPONENT);
637         json.endMember();
638     }
639
640     if (dumpStencil) {
641         json.beginMember("GL_STENCIL_INDEX");
642         dumpDrawBufferImage(json, GL_STENCIL_INDEX);
643         json.endMember();
644     }
645 }
646
647
648 static void
649 dumpFramebuffer(JSONWriter &json)
650 {
651     json.beginMember("framebuffer");
652     json.beginObject();
653
654     GLint boundDrawFbo = 0, boundReadFbo = 0;
655     glGetIntegerv(GL_DRAW_FRAMEBUFFER_BINDING, &boundDrawFbo);
656     glGetIntegerv(GL_READ_FRAMEBUFFER_BINDING, &boundReadFbo);
657     if (!boundDrawFbo) {
658         GLint depth_bits = 0;
659         glGetIntegerv(GL_DEPTH_BITS, &depth_bits);
660         GLint stencil_bits = 0;
661         glGetIntegerv(GL_STENCIL_BITS, &stencil_bits);
662         dumpDrawBuffers(json, depth_bits, stencil_bits);
663     } else {
664         GLint colorRb, stencilRb, depthRb;
665         GLint boundRb;
666         glGetIntegerv(GL_RENDERBUFFER_BINDING, &boundRb);
667         GLint drawbuffer = GL_NONE;
668         glGetIntegerv(GL_DRAW_BUFFER, &drawbuffer);
669
670         glGetFramebufferAttachmentParameteriv(GL_FRAMEBUFFER,
671                                               drawbuffer,
672                                               GL_FRAMEBUFFER_ATTACHMENT_OBJECT_NAME,
673                                               &colorRb);
674         glGetFramebufferAttachmentParameteriv(GL_FRAMEBUFFER,
675                                               GL_DEPTH_ATTACHMENT,
676                                               GL_FRAMEBUFFER_ATTACHMENT_OBJECT_NAME,
677                                               &depthRb);
678         glGetFramebufferAttachmentParameteriv(GL_FRAMEBUFFER,
679                                               GL_STENCIL_ATTACHMENT,
680                                               GL_FRAMEBUFFER_ATTACHMENT_OBJECT_NAME,
681                                               &stencilRb);
682
683         GLint colorSamples, depthSamples, stencilSamples;
684         GLuint rbs[3];
685         GLint numRbs = 0;
686         GLuint fboCopy = 0;
687         glBindRenderbuffer(GL_RENDERBUFFER, colorRb);
688         glGetRenderbufferParameteriv(GL_RENDERBUFFER,
689                                      GL_RENDERBUFFER_SAMPLES, &colorSamples);
690         glBindRenderbuffer(GL_RENDERBUFFER, depthRb);
691         glGetRenderbufferParameteriv(GL_RENDERBUFFER,
692                                      GL_RENDERBUFFER_SAMPLES, &depthSamples);
693         glBindRenderbuffer(GL_RENDERBUFFER, stencilRb);
694         glGetRenderbufferParameteriv(GL_RENDERBUFFER,
695                                      GL_RENDERBUFFER_SAMPLES, &stencilSamples);
696         glBindRenderbuffer(GL_RENDERBUFFER, boundRb);
697
698         if (colorSamples || depthSamples || stencilSamples) {
699             //glReadPixels doesnt support multisampled buffers so we need
700             // to blit the fbo to a temporary one
701             fboCopy = downsampledFramebuffer(boundDrawFbo, drawbuffer,
702                                              colorRb, depthRb, stencilRb,
703                                              rbs, &numRbs);
704         }
705         glDrawBuffer(drawbuffer);
706         glReadBuffer(drawbuffer);
707
708         dumpDrawBuffers(json, depthRb, stencilRb);
709
710         if (fboCopy) {
711             glBindFramebuffer(GL_FRAMEBUFFER, boundDrawFbo);
712             glBindFramebuffer(GL_READ_FRAMEBUFFER, boundReadFbo);
713             glBindFramebuffer(GL_DRAW_FRAMEBUFFER, boundDrawFbo);
714             glBindRenderbuffer(GL_RENDERBUFFER_BINDING, boundRb);
715             glDeleteRenderbuffers(numRbs, rbs);
716             glDeleteFramebuffers(1, &fboCopy);
717         }
718     }
719
720     json.endObject();
721     json.endMember(); // framebuffer
722 }
723
724
725 void dumpCurrentContext(std::ostream &os)
726 {
727     JSONWriter json(os);
728     dumpParameters(json);
729     dumpShaders(json);
730     dumpTextures(json);
731     dumpFramebuffer(json);
732 }
733
734
735 } /* namespace glstate */