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Thread: Simple Qt Quick example isn't drawn in android emulator

  1. #1
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    Default Simple Qt Quick example isn't drawn in android emulator

    By default then creating new Qt Quick 1.3 project it creates stub with 3 buttons and menu. It works fine on my smartphone but in emulator (tried standard one and genymotion, armv7 and x86) it doesn't draw anything. Only white screen. But if I "touch" (click) there buttons are supposed to be it reacts with a pop up as it should. Some part of error log in console at the moment: http://pastebin.com/1e7ZiGKq

    I don't get what is wrong and because I haven't found any mentions of this or threads I think it's some sort of the bug/misconfiguration and it should work correctly. How to solve this problem? P.S. Normal QWidget app works fine.

    QT 5.4.1, Win 8.1

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    Default Re: Simple Qt Quick example isn't drawn in android emulator

    It seems that the code uses a dialect of GLSL unsupported by the emulator (e.g. OpenGLES vs OpenGL). The emulator probably requires the desktop (OpenGL) dialect since that's what your system has.
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    Default Re: Simple Qt Quick example isn't drawn in android emulator

    Quote Originally Posted by wysota View Post
    It seems that the code uses a dialect of GLSL unsupported by the emulator (e.g. OpenGLES vs OpenGL). The emulator probably requires the desktop (OpenGL) dialect since that's what your system has.
    But it's an ANDROID app. And It launches on my 4.2.2 smartphone just fine. Furthermore, it's just example that is automatically generated when you create new qt quick project - with to buttons and menu bar. Either both major emulators doesn't support GLES at all and no one ether mentions this on the internet or there is some problem with configuration/qt.

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    Default Re: Simple Qt Quick example isn't drawn in android emulator

    Quote Originally Posted by flashmozzg View Post
    But it's an ANDROID app.
    But it's running on an EMULATOR on a desktop machine equipped with OpenGL.

    And It launches on my 4.2.2 smartphone just fine.
    Because the phone has OpenGLES and not OpenGL.
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    Default Re: Simple Qt Quick example isn't drawn in android emulator

    Quote Originally Posted by wysota View Post
    But it's running on an EMULATOR on a desktop machine equipped with OpenGL.
    Because the phone has OpenGLES and not OpenGL.
    But emulator converts GLES 2 to GL 2.0. At least since 2012:
    http://android-developers.blogspot.c...-hardware.html

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    Default Re: Simple Qt Quick example isn't drawn in android emulator

    Apparently either it doesn't (or does it incorrectly) for this shader or it does and it shouldn't be. Either way you are trying to run a shader incompatible with what the GLSL compiler expects.
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    Default Re: Simple Qt Quick example isn't drawn in android emulator

    Quote Originally Posted by wysota View Post
    Apparently either it doesn't (or does it incorrectly) for this shader or it does and it shouldn't be. Either way you are trying to run a shader incompatible with what the GLSL compiler expects.
    I run emulator on my notebook (win 8.1 x64 too) and it worked there like it should, so there some bug with it on my desktop.

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    Default Re: Simple Qt Quick example isn't drawn in android emulator

    Your desktop probably has a different graphics card vendor than your laptop so you have two differently behaving GLSL compilers. Maybe try disabling the glsl-translation feature in your emulator and see if it helps.
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    Default Re: Simple Qt Quick example isn't drawn in android emulator

    Quote Originally Posted by wysota View Post
    Your desktop probably has a different graphics card vendor than your laptop so you have two differently behaving GLSL compilers. Maybe try disabling the glsl-translation feature in your emulator and see if it helps.
    Without glsl translation it simply won't work : E/libEGL ( 1079): called unimplemented OpenGL ES API

    New, more complete log (it captures some java exceptions at the start) :
    http://pastebin.com/eJrYLcnb

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    Default Re: Simple Qt Quick example isn't drawn in android emulator

    You still get the same error about precision modifiers being already defined.
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    Default Re: Simple Qt Quick example isn't drawn in android emulator

    Quote Originally Posted by wysota View Post
    You still get the same error about precision modifiers being already defined.
    Yep.
    I managed to run some GLES api tests in emulator and they worked fine. Only qt app has problems so far. Furthermore it even crashes my driver and hangs sometimes when it tries to deploy from qt creator to emulator. Don't know if it's qt problem or not and how to deal with this problem.

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    Default Re: Simple Qt Quick example isn't drawn in android emulator

    Quote Originally Posted by flashmozzg View Post
    I managed to run some GLES api tests in emulator and they worked fine.
    They are using different shaders so that's obvious.

    Furthermore it even crashes my driver and hangs sometimes when it tries to deploy from qt creator to emulator. Don't know if it's qt problem or not and how to deal with this problem.
    I think that's unrelated.

    Did you try turning of the shader translation in the emulator?
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    Default Re: Simple Qt Quick example isn't drawn in android emulator

    Quote Originally Posted by wysota View Post
    They are using different shaders so that's obvious.
    Did you try turning of the shader translation in the emulator?
    What is the way to do it?

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    Default Re: Simple Qt Quick example isn't drawn in android emulator

    Quote Originally Posted by flashmozzg View Post
    What is the way to do it?
    No idea, consult the emulator documentation.
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    Default Re: Simple Qt Quick example isn't drawn in android emulator

    Quote Originally Posted by wysota View Post
    No idea, consult the emulator documentation.
    If you mean translation from openGL ES emu calls to openGL on my PC, I tried that, see #9 post. It won't draw anything at all since it requires GLES to draw qt quick interface.

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