1 /**************************************************************************
3 * Copyright 2011 Jose Fonseca
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:
13 * The above copyright notice and this permission notice shall be included in
14 * all copies or substantial portions of the Software.
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
24 **************************************************************************/
37 #include "glstate.hpp"
38 #include "glstate_internal.hpp"
47 #include <Carbon/Carbon.h>
53 OSStatus CGSGetSurfaceBounds(CGSConnectionID, CGWindowID, CGSSurfaceID, CGRect *);
59 #endif /* __APPLE__ */
62 /* Change thi to one to force interpreting depth buffers as RGBA, which enables
63 * visualizing full dynamic range, until we can transmit HDR images to the GUI */
64 #define DEPTH_AS_RGBA 0
82 internalFormat(GL_NONE)
87 return width > 0 && height > 0 && depth > 0;
93 * Sames as enumToString, but with special provision to handle formatsLUMINANCE_ALPHA.
95 * OpenGL 2.1 specification states that "internalFormat may (for backwards
96 * compatibility with the 1.0 version of the GL) also take on the integer
97 * values 1, 2, 3, and 4, which are equivalent to symbolic constants LUMINANCE,
98 * LUMINANCE ALPHA, RGB, and RGBA respectively".
101 formatToString(GLenum internalFormat) {
102 switch (internalFormat) {
104 return "GL_LUMINANCE";
106 return "GL_LUMINANCE_ALPHA";
112 return enumToString(internalFormat);
118 * OpenGL ES does not support glGetTexLevelParameteriv, but it is possible to
119 * probe whether a texture has a given size by crafting a dummy glTexSubImage()
123 probeTextureLevelSizeOES(GLenum target, GLint level, const GLint size[3]) {
124 while (glGetError() != GL_NO_ERROR)
127 GLenum internalFormat = GL_RGBA;
128 GLenum type = GL_UNSIGNED_BYTE;
133 case GL_TEXTURE_CUBE_MAP:
134 case GL_TEXTURE_CUBE_MAP_POSITIVE_X:
135 case GL_TEXTURE_CUBE_MAP_NEGATIVE_X:
136 case GL_TEXTURE_CUBE_MAP_POSITIVE_Y:
137 case GL_TEXTURE_CUBE_MAP_NEGATIVE_Y:
138 case GL_TEXTURE_CUBE_MAP_POSITIVE_Z:
139 case GL_TEXTURE_CUBE_MAP_NEGATIVE_Z:
140 glTexSubImage2D(target, level, size[0], size[1], 0, 0, internalFormat, type, &dummy);
142 case GL_TEXTURE_3D_OES:
143 glTexSubImage3DOES(target, level, size[0], size[1], size[2], 0, 0, 0, internalFormat, type, &dummy);
149 GLenum error = glGetError();
152 std::cerr << "(" << size[0] << ", " << size[1] << ", " << size[2] << ") = " << enumToString(error) << "\n";
155 if (error == GL_NO_ERROR) {
159 while (glGetError() != GL_NO_ERROR)
167 * Bisect the texture size along an axis.
169 * It is assumed that the texture exists.
172 bisectTextureLevelSizeOES(GLenum target, GLint level, GLint axis, GLint max) {
173 GLint size[3] = {0, 0, 0};
180 GLint test = (min + max) / 2;
187 if (probeTextureLevelSizeOES(target, level, size)) {
197 * Special path to obtain texture size on OpenGL ES, that does not rely on
198 * glGetTexLevelParameteriv
201 getActiveTextureLevelDescOES(Context &context, GLenum target, GLint level, ImageDesc &desc)
203 if (target == GL_TEXTURE_1D) {
204 // OpenGL ES does not support 1D textures
208 const GLint size[3] = {1, 1, 1};
209 if (!probeTextureLevelSizeOES(target, level, size)) {
214 desc.internalFormat = GL_RGBA;
219 glGetIntegerv(GL_MAX_TEXTURE_SIZE, &maxSize);
220 desc.width = bisectTextureLevelSizeOES(target, level, 0, maxSize);
221 desc.height = bisectTextureLevelSizeOES(target, level, 1, maxSize);
224 case GL_TEXTURE_CUBE_MAP:
225 case GL_TEXTURE_CUBE_MAP_POSITIVE_X:
226 case GL_TEXTURE_CUBE_MAP_NEGATIVE_X:
227 case GL_TEXTURE_CUBE_MAP_POSITIVE_Y:
228 case GL_TEXTURE_CUBE_MAP_NEGATIVE_Y:
229 case GL_TEXTURE_CUBE_MAP_POSITIVE_Z:
230 case GL_TEXTURE_CUBE_MAP_NEGATIVE_Z:
231 glGetIntegerv(GL_MAX_CUBE_MAP_TEXTURE_SIZE, &maxSize);
232 desc.width = bisectTextureLevelSizeOES(target, level, 0, maxSize);
233 desc.height = desc.width;
236 case GL_TEXTURE_3D_OES:
237 glGetIntegerv(GL_MAX_3D_TEXTURE_SIZE_OES, &maxSize);
238 desc.width = bisectTextureLevelSizeOES(target, level, 0, maxSize);
239 desc.width = bisectTextureLevelSizeOES(target, level, 1, maxSize);
240 desc.depth = bisectTextureLevelSizeOES(target, level, 2, maxSize);
248 << enumToString(target) << " "
250 << desc.width << "x" << desc.height << "x" << desc.depth
259 getActiveTextureLevelDesc(Context &context, GLenum target, GLint level, ImageDesc &desc)
261 assert(target != GL_TEXTURE_CUBE_MAP);
264 return getActiveTextureLevelDescOES(context, target, level, desc);
267 glGetTexLevelParameteriv(target, level, GL_TEXTURE_INTERNAL_FORMAT, &desc.internalFormat);
270 glGetTexLevelParameteriv(target, level, GL_TEXTURE_WIDTH, &desc.width);
272 if (target == GL_TEXTURE_1D) {
277 glGetTexLevelParameteriv(target, level, GL_TEXTURE_HEIGHT, &desc.height);
278 if (target != GL_TEXTURE_3D) {
282 glGetTexLevelParameteriv(target, level, GL_TEXTURE_DEPTH, &desc.depth);
291 getTextureBinding(GLenum target)
295 return GL_TEXTURE_BINDING_1D;
296 case GL_TEXTURE_1D_ARRAY:
297 return GL_TEXTURE_BINDING_1D_ARRAY;
299 return GL_TEXTURE_BINDING_2D;
300 case GL_TEXTURE_2D_MULTISAMPLE:
301 return GL_TEXTURE_BINDING_2D_MULTISAMPLE;
302 case GL_TEXTURE_2D_ARRAY:
303 return GL_TEXTURE_BINDING_2D_ARRAY;
304 case GL_TEXTURE_RECTANGLE:
305 return GL_TEXTURE_BINDING_RECTANGLE;
306 case GL_TEXTURE_CUBE_MAP:
307 case GL_TEXTURE_CUBE_MAP_POSITIVE_X:
308 case GL_TEXTURE_CUBE_MAP_NEGATIVE_X:
309 case GL_TEXTURE_CUBE_MAP_POSITIVE_Y:
310 case GL_TEXTURE_CUBE_MAP_NEGATIVE_Y:
311 case GL_TEXTURE_CUBE_MAP_POSITIVE_Z:
312 case GL_TEXTURE_CUBE_MAP_NEGATIVE_Z:
313 return GL_TEXTURE_BINDING_CUBE_MAP;
314 case GL_TEXTURE_CUBE_MAP_ARRAY:
315 return GL_TEXTURE_BINDING_CUBE_MAP_ARRAY;
317 return GL_TEXTURE_BINDING_3D;
326 * OpenGL ES does not support glGetTexImage. Obtain the pixels by attaching the
327 * texture to a framebuffer.
330 getTexImageOES(GLenum target, GLint level, ImageDesc &desc, GLubyte *pixels)
332 memset(pixels, 0x80, desc.height * desc.width * 4);
334 GLenum texture_binding = getTextureBinding(target);
335 if (texture_binding == GL_NONE) {
340 glGetIntegerv(texture_binding, &texture);
347 glGetIntegerv(GL_FRAMEBUFFER_BINDING, &prev_fbo);
348 glGenFramebuffers(1, &fbo);
349 glBindFramebuffer(GL_FRAMEBUFFER, fbo);
355 case GL_TEXTURE_CUBE_MAP_POSITIVE_X:
356 case GL_TEXTURE_CUBE_MAP_NEGATIVE_X:
357 case GL_TEXTURE_CUBE_MAP_POSITIVE_Y:
358 case GL_TEXTURE_CUBE_MAP_NEGATIVE_Y:
359 case GL_TEXTURE_CUBE_MAP_POSITIVE_Z:
360 case GL_TEXTURE_CUBE_MAP_NEGATIVE_Z:
361 glFramebufferTexture2D(GL_FRAMEBUFFER, GL_COLOR_ATTACHMENT0, GL_TEXTURE_2D, texture, level);
362 status = glCheckFramebufferStatus(GL_FRAMEBUFFER);
363 if (status != GL_FRAMEBUFFER_COMPLETE) {
364 std::cerr << __FUNCTION__ << ": " << enumToString(status) << "\n";
366 glReadPixels(0, 0, desc.width, desc.height, GL_RGBA, GL_UNSIGNED_BYTE, pixels);
368 case GL_TEXTURE_3D_OES:
369 for (int i = 0; i < desc.depth; i++) {
370 glFramebufferTexture3D(GL_FRAMEBUFFER, GL_COLOR_ATTACHMENT0, GL_TEXTURE_3D, texture, level, i);
371 glReadPixels(0, 0, desc.width, desc.height, GL_RGBA, GL_UNSIGNED_BYTE, pixels + 4 * i * desc.width * desc.height);
376 glBindFramebuffer(GL_FRAMEBUFFER, prev_fbo);
378 glDeleteFramebuffers(1, &fbo);
382 static inline GLboolean
383 isDepthFormat(GLenum internalFormat)
385 switch (internalFormat) {
386 case GL_DEPTH_COMPONENT:
387 case GL_DEPTH_COMPONENT16:
388 case GL_DEPTH_COMPONENT24:
389 case GL_DEPTH_COMPONENT32:
390 case GL_DEPTH_COMPONENT32F:
391 case GL_DEPTH_COMPONENT32F_NV:
392 case GL_DEPTH_STENCIL:
393 case GL_DEPTH24_STENCIL8:
394 case GL_DEPTH32F_STENCIL8:
395 case GL_DEPTH32F_STENCIL8_NV:
403 dumpActiveTextureLevel(JSONWriter &json, Context &context, GLenum target, GLint level)
406 if (!getActiveTextureLevelDesc(context, target, level, desc)) {
411 GLint active_texture = GL_TEXTURE0;
412 glGetIntegerv(GL_ACTIVE_TEXTURE, &active_texture);
413 snprintf(label, sizeof label, "%s, %s, level = %d",
414 enumToString(active_texture), enumToString(target), level);
416 json.beginMember(label);
420 if (!context.ES && isDepthFormat(desc.internalFormat)) {
421 format = GL_DEPTH_COMPONENT;
428 image::Image *image = new image::Image(desc.width, desc.height*desc.depth, channels, true);
430 context.resetPixelPackState();
433 getTexImageOES(target, level, desc, image->pixels);
435 glGetTexImage(target, level, format, GL_UNSIGNED_BYTE, image->pixels);
438 context.restorePixelPackState();
440 json.writeImage(image, formatToString(desc.internalFormat), desc.depth);
444 json.endMember(); // label
449 dumpTexture(JSONWriter &json, Context &context, GLenum target, GLenum binding)
451 GLint texture_binding = 0;
452 glGetIntegerv(binding, &texture_binding);
453 if (!glIsEnabled(target) && !texture_binding) {
461 if (target == GL_TEXTURE_CUBE_MAP) {
462 for (int face = 0; face < 6; ++face) {
463 if (!getActiveTextureLevelDesc(context, GL_TEXTURE_CUBE_MAP_POSITIVE_X + face, level, desc)) {
466 dumpActiveTextureLevel(json, context, GL_TEXTURE_CUBE_MAP_POSITIVE_X + face, level);
469 if (!getActiveTextureLevelDesc(context, target, level, desc)) {
472 dumpActiveTextureLevel(json, context, target, level);
481 dumpTextures(JSONWriter &json, Context &context)
483 json.beginMember("textures");
485 GLint active_texture = GL_TEXTURE0;
486 glGetIntegerv(GL_ACTIVE_TEXTURE, &active_texture);
488 GLint max_texture_coords = 0;
489 glGetIntegerv(GL_MAX_TEXTURE_COORDS, &max_texture_coords);
490 GLint max_combined_texture_image_units = 0;
491 glGetIntegerv(GL_MAX_COMBINED_TEXTURE_IMAGE_UNITS, &max_combined_texture_image_units);
492 GLint max_units = std::max(max_combined_texture_image_units, max_texture_coords);
495 * At least the Android software GL implementation doesn't return the
496 * proper value for this, but rather returns 0. The GL(ES) specification
497 * mandates a minimum value of 2, so use this as a fall-back value.
499 max_units = std::max(max_units, 2);
501 for (GLint unit = 0; unit < max_units; ++unit) {
502 GLenum texture = GL_TEXTURE0 + unit;
503 glActiveTexture(texture);
504 dumpTexture(json, context, GL_TEXTURE_1D, GL_TEXTURE_BINDING_1D);
505 dumpTexture(json, context, GL_TEXTURE_2D, GL_TEXTURE_BINDING_2D);
506 dumpTexture(json, context, GL_TEXTURE_3D, GL_TEXTURE_BINDING_3D);
507 dumpTexture(json, context, GL_TEXTURE_RECTANGLE, GL_TEXTURE_BINDING_RECTANGLE);
508 dumpTexture(json, context, GL_TEXTURE_CUBE_MAP, GL_TEXTURE_BINDING_CUBE_MAP);
510 glActiveTexture(active_texture);
512 json.endMember(); // textures
517 getDrawableBounds(GLint *width, GLint *height) {
518 #if defined(__linux__)
519 if (dlsym(RTLD_DEFAULT, "eglGetCurrentContext")) {
520 EGLContext currentContext = eglGetCurrentContext();
521 if (currentContext != EGL_NO_CONTEXT) {
522 EGLSurface currentSurface = eglGetCurrentSurface(EGL_DRAW);
523 if (currentSurface == EGL_NO_SURFACE) {
527 EGLDisplay currentDisplay = eglGetCurrentDisplay();
528 if (currentDisplay == EGL_NO_DISPLAY) {
532 if (!eglQuerySurface(currentDisplay, currentSurface, EGL_WIDTH, width) ||
533 !eglQuerySurface(currentDisplay, currentSurface, EGL_HEIGHT, height)) {
544 HDC hDC = wglGetCurrentDC();
549 HWND hWnd = WindowFromDC(hDC);
552 if (!GetClientRect(hWnd, &rect)) {
556 *width = rect.right - rect.left;
557 *height = rect.bottom - rect.top;
560 #elif defined(__APPLE__)
562 CGLContextObj ctx = CGLGetCurrentContext();
571 if (CGLGetSurface(ctx, &cid, &wid, &sid) != kCGLNoError) {
577 if (CGSGetSurfaceBounds(cid, wid, sid, &rect) != 0) {
581 *width = rect.size.width;
582 *height = rect.size.height;
585 #elif defined(HAVE_X11)
591 unsigned int w, h, bw, depth;
593 display = glXGetCurrentDisplay();
598 drawable = glXGetCurrentDrawable();
599 if (drawable == None) {
603 if (!XGetGeometry(display, drawable, &root, &x, &y, &w, &h, &bw, &depth)) {
619 struct TextureTargetBinding
630 GL_TEXTURE_RECTANGLE,
633 GL_TEXTURE_2D_MULTISAMPLE,
636 GL_TEXTURE_CUBE_MAP_ARRAY,
641 getTextureTarget(GLint texture)
643 if (!glIsTexture(texture)) {
647 for (unsigned i = 0; i < sizeof(textureTargets)/sizeof(textureTargets[0]); ++i) {
648 GLenum target = textureTargets[i];
649 GLenum binding = getTextureBinding(target);
651 while (glGetError() != GL_NO_ERROR)
654 GLint bound_texture = 0;
655 glGetIntegerv(binding, &bound_texture);
656 glBindTexture(target, texture);
658 bool succeeded = glGetError() == GL_NO_ERROR;
660 glBindTexture(target, bound_texture);
672 getBoundRenderbufferDesc(Context &context, ImageDesc &desc)
674 glGetRenderbufferParameteriv(GL_RENDERBUFFER, GL_RENDERBUFFER_WIDTH, &desc.width);
675 glGetRenderbufferParameteriv(GL_RENDERBUFFER, GL_RENDERBUFFER_HEIGHT, &desc.height);
678 glGetRenderbufferParameteriv(GL_RENDERBUFFER, GL_RENDERBUFFER_INTERNAL_FORMAT, &desc.internalFormat);
685 getRenderbufferDesc(Context &context, GLint renderbuffer, ImageDesc &desc)
687 GLint bound_renderbuffer = 0;
688 glGetIntegerv(GL_RENDERBUFFER_BINDING, &bound_renderbuffer);
689 glBindRenderbuffer(GL_RENDERBUFFER, renderbuffer);
691 getBoundRenderbufferDesc(context, desc);
693 glBindRenderbuffer(GL_RENDERBUFFER, bound_renderbuffer);
700 getFramebufferAttachmentDesc(Context &context, GLenum target, GLenum attachment, ImageDesc &desc)
702 GLint object_type = GL_NONE;
703 glGetFramebufferAttachmentParameteriv(target, attachment,
704 GL_FRAMEBUFFER_ATTACHMENT_OBJECT_TYPE,
706 if (object_type == GL_NONE) {
710 GLint object_name = 0;
711 glGetFramebufferAttachmentParameteriv(target, attachment,
712 GL_FRAMEBUFFER_ATTACHMENT_OBJECT_NAME,
714 if (object_name == 0) {
718 if (object_type == GL_RENDERBUFFER) {
719 return getRenderbufferDesc(context, object_name, desc);
720 } else if (object_type == GL_TEXTURE) {
721 GLint texture_face = 0;
722 glGetFramebufferAttachmentParameteriv(target, attachment,
723 GL_FRAMEBUFFER_ATTACHMENT_TEXTURE_CUBE_MAP_FACE,
726 GLint texture_level = 0;
727 glGetFramebufferAttachmentParameteriv(target, attachment,
728 GL_FRAMEBUFFER_ATTACHMENT_TEXTURE_LEVEL,
731 GLint bound_texture = 0;
732 if (texture_face != 0) {
733 glGetIntegerv(GL_TEXTURE_BINDING_CUBE_MAP, &bound_texture);
734 glBindTexture(GL_TEXTURE_CUBE_MAP, object_name);
735 getActiveTextureLevelDesc(context, texture_face, texture_level, desc);
736 glBindTexture(GL_TEXTURE_CUBE_MAP, bound_texture);
738 GLenum texture_target = getTextureTarget(object_name);
739 GLenum texture_binding = getTextureBinding(texture_target);
740 glGetIntegerv(texture_binding, &bound_texture);
741 glBindTexture(texture_target, object_name);
742 getActiveTextureLevelDesc(context, texture_target, texture_level, desc);
743 glBindTexture(texture_target, bound_texture);
748 std::cerr << "warning: unexpected GL_FRAMEBUFFER_ATTACHMENT_OBJECT_TYPE = " << object_type << "\n";
756 getDrawBufferImage() {
757 GLenum format = GL_RGB;
758 GLint channels = _gl_format_channels(format);
765 GLenum framebuffer_binding;
766 GLenum framebuffer_target;
768 framebuffer_binding = GL_FRAMEBUFFER_BINDING;
769 framebuffer_target = GL_FRAMEBUFFER;
771 framebuffer_binding = GL_DRAW_FRAMEBUFFER_BINDING;
772 framebuffer_target = GL_DRAW_FRAMEBUFFER;
775 GLint draw_framebuffer = 0;
776 glGetIntegerv(framebuffer_binding, &draw_framebuffer);
778 GLint draw_buffer = GL_NONE;
780 if (draw_framebuffer) {
781 if (context.ARB_draw_buffers) {
782 glGetIntegerv(GL_DRAW_BUFFER0, &draw_buffer);
783 if (draw_buffer == GL_NONE) {
787 // GL_COLOR_ATTACHMENT0 is implied
788 draw_buffer = GL_COLOR_ATTACHMENT0;
791 if (!getFramebufferAttachmentDesc(context, framebuffer_target, draw_buffer, desc)) {
796 // XXX: Draw buffer is always FRONT for single buffer context, BACK
797 // for double buffered contexts. There is no way to know which (as
798 // GL_DOUBLEBUFFER state is also unavailable), so always assume
800 draw_buffer = GL_BACK;
802 glGetIntegerv(GL_DRAW_BUFFER, &draw_buffer);
803 if (draw_buffer == GL_NONE) {
808 if (!getDrawableBounds(&desc.width, &desc.height)) {
815 GLenum type = GL_UNSIGNED_BYTE;
818 if (format == GL_DEPTH_COMPONENT) {
819 type = GL_UNSIGNED_INT;
824 image::Image *image = new image::Image(desc.width, desc.height, channels, true);
829 while (glGetError() != GL_NO_ERROR) {}
831 GLint read_framebuffer = 0;
832 GLint read_buffer = GL_NONE;
834 glGetIntegerv(GL_READ_FRAMEBUFFER_BINDING, &read_framebuffer);
835 glBindFramebuffer(GL_READ_FRAMEBUFFER, draw_framebuffer);
837 glGetIntegerv(GL_READ_BUFFER, &read_buffer);
838 glReadBuffer(draw_buffer);
841 // TODO: reset imaging state too
842 context.resetPixelPackState();
844 glReadPixels(0, 0, desc.width, desc.height, format, type, image->pixels);
846 context.restorePixelPackState();
849 glReadBuffer(read_buffer);
850 glBindFramebuffer(GL_READ_FRAMEBUFFER, read_framebuffer);
853 GLenum error = glGetError();
854 if (error != GL_NO_ERROR) {
856 std::cerr << "warning: " << enumToString(error) << " while getting snapshot\n";
857 error = glGetError();
858 } while(error != GL_NO_ERROR);
868 * Dump the image of the currently bound read buffer.
871 dumpReadBufferImage(JSONWriter &json, GLint width, GLint height, GLenum format,
872 GLint internalFormat = GL_NONE)
874 GLint channels = _gl_format_channels(format);
876 if (internalFormat == GL_NONE) {
877 internalFormat = format;
882 GLenum type = GL_UNSIGNED_BYTE;
885 if (format == GL_DEPTH_COMPONENT) {
886 type = GL_UNSIGNED_INT;
891 image::Image *image = new image::Image(width, height, channels, true);
893 // TODO: reset imaging state too
894 context.resetPixelPackState();
896 glReadPixels(0, 0, width, height, format, type, image->pixels);
898 context.restorePixelPackState();
900 json.writeImage(image, formatToString(internalFormat));
907 downsampledFramebuffer(Context &context,
908 GLuint oldFbo, GLint drawbuffer,
909 GLint colorRb, GLint depthRb, GLint stencilRb,
910 GLuint *rbs, GLint *numRbs)
917 glGenFramebuffers(1, &fbo);
918 glBindFramebuffer(GL_FRAMEBUFFER, fbo);
923 glBindRenderbuffer(GL_RENDERBUFFER, colorRb);
924 getBoundRenderbufferDesc(context, desc);
926 glGenRenderbuffers(1, &rbs[*numRbs]);
927 glBindRenderbuffer(GL_RENDERBUFFER, rbs[*numRbs]);
928 glRenderbufferStorage(GL_RENDERBUFFER, desc.internalFormat, desc.width, desc.height);
929 glFramebufferRenderbuffer(GL_FRAMEBUFFER, drawbuffer,
930 GL_RENDERBUFFER, rbs[*numRbs]);
932 glBindFramebuffer(GL_READ_FRAMEBUFFER, oldFbo);
933 glBindFramebuffer(GL_DRAW_FRAMEBUFFER, fbo);
934 glDrawBuffer(drawbuffer);
935 glReadBuffer(drawbuffer);
936 glBlitFramebuffer(0, 0, desc.width, desc.height, 0, 0, desc.width, desc.height,
937 GL_COLOR_BUFFER_BIT, GL_NEAREST);
938 glBindFramebuffer(GL_FRAMEBUFFER, fbo);
942 if (stencilRb == depthRb && stencilRb) {
943 //combined depth and stencil buffer
945 glBindRenderbuffer(GL_RENDERBUFFER, depthRb);
946 getBoundRenderbufferDesc(context, desc);
948 glGenRenderbuffers(1, &rbs[*numRbs]);
949 glBindRenderbuffer(GL_RENDERBUFFER, rbs[*numRbs]);
950 glRenderbufferStorage(GL_RENDERBUFFER, desc.internalFormat, desc.width, desc.height);
951 glFramebufferRenderbuffer(GL_FRAMEBUFFER, GL_DEPTH_STENCIL_ATTACHMENT,
952 GL_RENDERBUFFER, rbs[*numRbs]);
953 glBindFramebuffer(GL_READ_FRAMEBUFFER, oldFbo);
954 glBindFramebuffer(GL_DRAW_FRAMEBUFFER, fbo);
955 glBlitFramebuffer(0, 0, desc.width, desc.height, 0, 0, desc.width, desc.height,
956 GL_DEPTH_BUFFER_BIT | GL_STENCIL_BUFFER_BIT, GL_NEAREST);
957 glBindFramebuffer(GL_FRAMEBUFFER, fbo);
962 glBindRenderbuffer(GL_RENDERBUFFER, depthRb);
963 getBoundRenderbufferDesc(context, desc);
965 glGenRenderbuffers(1, &rbs[*numRbs]);
966 glBindRenderbuffer(GL_RENDERBUFFER, rbs[*numRbs]);
967 glRenderbufferStorage(GL_RENDERBUFFER, desc.internalFormat, desc.width, desc.height);
968 glFramebufferRenderbuffer(GL_FRAMEBUFFER,
970 GL_RENDERBUFFER, rbs[*numRbs]);
971 glBindFramebuffer(GL_READ_FRAMEBUFFER, oldFbo);
972 glBindFramebuffer(GL_DRAW_FRAMEBUFFER, fbo);
973 glDrawBuffer(GL_DEPTH_ATTACHMENT);
974 glReadBuffer(GL_DEPTH_ATTACHMENT);
975 glBlitFramebuffer(0, 0, desc.width, desc.height, 0, 0, desc.width, desc.height,
976 GL_DEPTH_BUFFER_BIT, GL_NEAREST);
981 glBindRenderbuffer(GL_RENDERBUFFER, stencilRb);
982 getBoundRenderbufferDesc(context, desc);
984 glGenRenderbuffers(1, &rbs[*numRbs]);
985 glBindRenderbuffer(GL_RENDERBUFFER, rbs[*numRbs]);
986 glRenderbufferStorage(GL_RENDERBUFFER, desc.internalFormat, desc.width, desc.height);
987 glFramebufferRenderbuffer(GL_FRAMEBUFFER,
988 GL_STENCIL_ATTACHMENT,
989 GL_RENDERBUFFER, rbs[*numRbs]);
990 glBindFramebuffer(GL_READ_FRAMEBUFFER, oldFbo);
991 glBindFramebuffer(GL_DRAW_FRAMEBUFFER, fbo);
992 glDrawBuffer(GL_STENCIL_ATTACHMENT);
993 glReadBuffer(GL_STENCIL_ATTACHMENT);
994 glBlitFramebuffer(0, 0, desc.width, desc.height, 0, 0, desc.width, desc.height,
995 GL_STENCIL_BUFFER_BIT, GL_NEAREST);
1005 * Dump images of current draw drawable/window.
1008 dumpDrawableImages(JSONWriter &json, Context &context)
1010 GLint width, height;
1012 if (!getDrawableBounds(&width, &height)) {
1016 GLint draw_buffer = GL_NONE;
1018 // XXX: Draw buffer is always FRONT for single buffer context, BACK for
1019 // double buffered contexts. There is no way to know which (as
1020 // GL_DOUBLEBUFFER state is also unavailable), so always assume
1021 // double-buffering.
1022 draw_buffer = GL_BACK;
1024 glGetIntegerv(GL_DRAW_BUFFER, &draw_buffer);
1027 if (draw_buffer != GL_NONE) {
1028 // Read from current draw buffer
1029 GLint read_buffer = GL_NONE;
1031 glGetIntegerv(GL_READ_BUFFER, &read_buffer);
1032 glReadBuffer(draw_buffer);
1035 GLint alpha_bits = 0;
1037 // XXX: Ignore alpha until we are able to match the traced visual
1038 glGetIntegerv(GL_ALPHA_BITS, &alpha_bits);
1040 GLenum format = alpha_bits ? GL_RGBA : GL_RGB;
1041 json.beginMember(enumToString(draw_buffer));
1042 dumpReadBufferImage(json, width, height, format);
1045 // Restore original read buffer
1047 glReadBuffer(read_buffer);
1052 GLint depth_bits = 0;
1053 glGetIntegerv(GL_DEPTH_BITS, &depth_bits);
1055 json.beginMember("GL_DEPTH_COMPONENT");
1056 dumpReadBufferImage(json, width, height, GL_DEPTH_COMPONENT);
1060 GLint stencil_bits = 0;
1061 glGetIntegerv(GL_STENCIL_BITS, &stencil_bits);
1063 json.beginMember("GL_STENCIL_INDEX");
1064 dumpReadBufferImage(json, width, height, GL_STENCIL_INDEX);
1072 * Dump the specified framebuffer attachment.
1074 * In the case of a color attachment, it assumes it is already bound for read.
1077 dumpFramebufferAttachment(JSONWriter &json, Context &context, GLenum target, GLenum attachment, GLenum format)
1080 if (!getFramebufferAttachmentDesc(context, target, attachment, desc)) {
1084 json.beginMember(enumToString(attachment));
1085 dumpReadBufferImage(json, desc.width, desc.height, format, desc.internalFormat);
1091 dumpFramebufferAttachments(JSONWriter &json, Context &context, GLenum target)
1093 GLint read_framebuffer = 0;
1094 glGetIntegerv(GL_READ_FRAMEBUFFER_BINDING, &read_framebuffer);
1096 GLint read_buffer = GL_NONE;
1097 glGetIntegerv(GL_READ_BUFFER, &read_buffer);
1099 GLint max_draw_buffers = 1;
1100 glGetIntegerv(GL_MAX_DRAW_BUFFERS, &max_draw_buffers);
1101 GLint max_color_attachments = 0;
1102 glGetIntegerv(GL_MAX_COLOR_ATTACHMENTS, &max_color_attachments);
1104 for (GLint i = 0; i < max_draw_buffers; ++i) {
1105 GLint draw_buffer = GL_NONE;
1106 glGetIntegerv(GL_DRAW_BUFFER0 + i, &draw_buffer);
1107 if (draw_buffer != GL_NONE) {
1108 glReadBuffer(draw_buffer);
1110 if (draw_buffer >= GL_COLOR_ATTACHMENT0 && draw_buffer < GL_COLOR_ATTACHMENT0 + max_color_attachments) {
1111 attachment = draw_buffer;
1113 std::cerr << "warning: unexpected GL_DRAW_BUFFER" << i << " = " << draw_buffer << "\n";
1114 attachment = GL_COLOR_ATTACHMENT0;
1116 GLint alpha_size = 0;
1117 glGetFramebufferAttachmentParameteriv(target, attachment,
1118 GL_FRAMEBUFFER_ATTACHMENT_ALPHA_SIZE,
1120 GLenum format = alpha_size ? GL_RGBA : GL_RGB;
1121 dumpFramebufferAttachment(json, context, target, attachment, format);
1125 glReadBuffer(read_buffer);
1128 dumpFramebufferAttachment(json, context, target, GL_DEPTH_ATTACHMENT, GL_DEPTH_COMPONENT);
1129 dumpFramebufferAttachment(json, context, target, GL_STENCIL_ATTACHMENT, GL_STENCIL_INDEX);
1132 glBindFramebuffer(GL_READ_FRAMEBUFFER, read_framebuffer);
1137 dumpFramebuffer(JSONWriter &json, Context &context)
1139 json.beginMember("framebuffer");
1142 GLint boundDrawFbo = 0, boundReadFbo = 0;
1143 glGetIntegerv(GL_DRAW_FRAMEBUFFER_BINDING, &boundDrawFbo);
1144 glGetIntegerv(GL_READ_FRAMEBUFFER_BINDING, &boundReadFbo);
1145 if (!boundDrawFbo) {
1146 dumpDrawableImages(json, context);
1147 } else if (context.ES) {
1148 dumpFramebufferAttachments(json, context, GL_FRAMEBUFFER);
1150 GLint colorRb = 0, stencilRb = 0, depthRb = 0;
1151 GLint draw_buffer0 = GL_NONE;
1152 glGetIntegerv(GL_DRAW_BUFFER0, &draw_buffer0);
1153 bool multisample = false;
1156 glGetIntegerv(GL_RENDERBUFFER_BINDING, &boundRb);
1159 glGetFramebufferAttachmentParameteriv(GL_DRAW_FRAMEBUFFER, draw_buffer0, GL_FRAMEBUFFER_ATTACHMENT_OBJECT_TYPE, &object_type);
1160 if (object_type == GL_RENDERBUFFER) {
1161 glGetFramebufferAttachmentParameteriv(GL_DRAW_FRAMEBUFFER, draw_buffer0, GL_FRAMEBUFFER_ATTACHMENT_OBJECT_NAME, &colorRb);
1162 glBindRenderbuffer(GL_RENDERBUFFER, colorRb);
1164 glGetRenderbufferParameteriv(GL_RENDERBUFFER, GL_RENDERBUFFER_SAMPLES, &samples);
1170 glGetFramebufferAttachmentParameteriv(GL_DRAW_FRAMEBUFFER, GL_DEPTH_ATTACHMENT, GL_FRAMEBUFFER_ATTACHMENT_OBJECT_TYPE, &object_type);
1171 if (object_type == GL_RENDERBUFFER) {
1172 glGetFramebufferAttachmentParameteriv(GL_DRAW_FRAMEBUFFER, GL_DEPTH_ATTACHMENT, GL_FRAMEBUFFER_ATTACHMENT_OBJECT_NAME, &depthRb);
1173 glBindRenderbuffer(GL_RENDERBUFFER, depthRb);
1175 glGetRenderbufferParameteriv(GL_RENDERBUFFER, GL_RENDERBUFFER_SAMPLES, &samples);
1181 glGetFramebufferAttachmentParameteriv(GL_DRAW_FRAMEBUFFER, GL_STENCIL_ATTACHMENT, GL_FRAMEBUFFER_ATTACHMENT_OBJECT_TYPE, &object_type);
1182 if (object_type == GL_RENDERBUFFER) {
1183 glGetFramebufferAttachmentParameteriv(GL_DRAW_FRAMEBUFFER, GL_STENCIL_ATTACHMENT, GL_FRAMEBUFFER_ATTACHMENT_OBJECT_NAME, &stencilRb);
1184 glBindRenderbuffer(GL_RENDERBUFFER, stencilRb);
1186 glGetRenderbufferParameteriv(GL_RENDERBUFFER, GL_RENDERBUFFER_SAMPLES, &samples);
1192 glBindRenderbuffer(GL_RENDERBUFFER, boundRb);
1199 // glReadPixels doesnt support multisampled buffers so we need
1200 // to blit the fbo to a temporary one
1201 fboCopy = downsampledFramebuffer(context,
1202 boundDrawFbo, draw_buffer0,
1203 colorRb, depthRb, stencilRb,
1207 dumpFramebufferAttachments(json, context, GL_DRAW_FRAMEBUFFER);
1210 glBindRenderbuffer(GL_RENDERBUFFER_BINDING, boundRb);
1211 glDeleteRenderbuffers(numRbs, rbs);
1212 glDeleteFramebuffers(1, &fboCopy);
1215 glBindFramebuffer(GL_READ_FRAMEBUFFER, boundReadFbo);
1216 glBindFramebuffer(GL_DRAW_FRAMEBUFFER, boundDrawFbo);
1220 json.endMember(); // framebuffer
1224 } /* namespace glstate */