c++ - Sharing Rendering Surfaces (FrameBuffers, Pbuffers, etc.) between OpenGL ES 2 Applications/Processes -

-

i'm designing opengl es 2.0-enabled applications on arm-based, embedded linux system using c++ , want share rendering surface (fbo or renderbuffer generated opengles2 or pbuffer created egl) of app "a" app "b".

since i'm beginner opengl es 2 (and, more importantly, since buffers on gpu's memory on have no control nor access), first thought of mapping shared memory object (e.g. uint8_t array of length width*height*colorcomponentcount, using posix shm_open() etc.) between 2 processes , periodically calling glreadpixels() on app "a" filling uploading in app "b" as, instance, 2d texture. of course, shared synchronization mechanism, such named semaphore, used well, not point of question:

i aware downloading buffer gpu (i.e. glreadpixels() in app "a") , uploading (i.e. texture 2d in app "b") not optimal solution sharing rendering surfaces between opengl es applications, why know if there better solution ?

the glreadpixels() approach way in portable, platform independent way opengl es 2.0 , incredibly slow. pixmaps allocated egl (not pbuffers) if platform implemented them.

i recommend either:

implement apps share common instance of opengl es somehow , use fbos texture attachments share images. if need portability.

or, customize linux platform provide support either @ kernel level or customized egl implements pixmap support. these articles fbos , egl image extension:

http://montgomery1.com/opengl/

Comments

Post a Comment

Popular posts from this blog

jQuery Mobile app not scrolling in Firefox -

-
i have mobile app built in jquery mobile. scrolling fine in chrome & safari, fails scroll in firefox on desktop. have other instances of same app, different features, , works across browsers. life of me, cannot figure this, please help! located here: http://re-brand.us/dsus/index.html seems bug in firefox: bug log . able scroll using keyboard not trackpad on mac. are using mac? i'll keep looking see if can find way around it.
Read more

c++ - How to add Crypto++ library to Qt project -

-
Image
i downloaded crypto++ source , compiled cryptlib project in visual studio 2013, , added generated .lib file qt project, made .pro file this: qt += core gui qt += sql greaterthan(qt_major_version, 4):qt += widgets target = untitled template = app sources += main.cpp\ mainwindow.cpp headers += mainwindow.h \ databasecontrol.h \ test.h forms += mainwindow.ui win32:config(release, debug|release): libs += -l$$pwd/ -lcryptlib else:win32:config(debug, debug|release): libs += -l$$pwd/ -lcryptlibd else:unix: libs += -l$$pwd/ -lcryptlib includepath += $$pwd/ dependpath += $$pwd/ win32-g++:config(release, debug|release): pre_targetdeps += $$pwd/libcryptlib.a else:win32-g++:config(debug, debug|release): pre_targetdeps += $$pwd/libcryptlibd.a else:win32:!win32-g++:config(release, debug|release): pre_targetdeps += $$pwd/cryptlib.lib else:win32:!win32-g++:config(debug, debug|release): pre_targetdeps += $$pwd/cryptlibd.lib else:unix: pre_targetdeps += $$pw
Read more

php array slice every 2th rule -

-
i have array on php outputs in txt file: printing grid -- 1 values -- undef = -9.99e+08 20.2 \nprinting grid -- 1 values -- undef = -9.99e+08 102.0 \nprinting grid -- 1 values -- undef = -9.99e+08 55.1 \nprinting grid -- 1 values -- undef = -9.99e+08 -18.3 \n what point, need nummeric values @ beginning of each rule. 20.2, 102.0, 55.1, -18,3 etc... example, there can more or less in txt file. now do? have tested array slice function can't exclude rule: printing grid -- 1 values -- undef = -9.99e+08 this array slice code... $arraygood = array_slice($arraybad, 1, 4); and foreach loop create text file: $file = fopen("array.txt","w"); foreach ($arraygood $meting => $waarde) { echo fwrite($file,$waarde . '\n'); } fclose($file); thanks! as posted in comments, understanding have array of strings similar following: $lines = array( "printing grid -- 1 values -- undef = -9.99e+08", "20.2 \nprinting grid --
Read more