[Interest] Bad application rendering on Remote Desktop
Calogero Mauceri
mauceri at actgate.com
Wed Apr 29 09:26:34 CEST 2015
Thanks Laszlo for your explanation.
I still do not understand why the whole application is not properly
rendered, not only the OpenGL stuff.
The application we are developing is a quite complex one, having
multiple windows, and the OpenGL one is a small part of it.
Simply including just one instance of QOpenGLWidget in the application
causes the bad rendering, even if that widget is not even shown.
Calogero
Il 4/28/2015 8:54 PM, Agocs Laszlo ha scritto:
> Because when using remote desktop you are suddenly left with OpenGL 1.1
> (ouch) and so QOpenGLWidget and friends that rely on OpenGL 2.0 features
> (like framebuffer objects) cease to function.
>
> The solution is to rely on ANGLE or a software rasterizer (like Mesa
> llvmpipe) in this case.
>
> When using the dynamic OpenGL builds, the fallback to ANGLE will happen
> automatically when using remote desktop. I assume you are using the
> -opengl packages from 5.4.1 and that's why this is not in place. With 5.5
> this won't be an issue since desktop OpenGL packages will not be provided
> anymore.
>
> Best regards,
> Laszlo
>
>
> On 27/04/15 17:17, "Calogero Mauceri" <mauceri at actgate.com> wrote:
>
>> Hi all,
>>
>> switching my application from using QGLWidget to the new QOpenGLWidget I
>> noticed a very weird problem when using the application through Remote
>> Desktop on Windows. The whole application is fully black, it is not
>> properly rendered, not only the QOpenGLWidget, but also the other
>> widgets in the application.
>>
>> I created a very simple example demonstrating my issue.
>>
>> MyWidget::MyWidget(QWidget* parent, Qt::WindowFlags fl)
>> : QWidget(parent, fl)
>> {
>> QVBoxLayout *vBoxLayout = new QVBoxLayout(this);
>> QHBoxLayout *hLayout = new QHBoxLayout;
>>
>> QLabel *myLabel = new QLabel("Test", this);
>> QPushButton *myButton = new QPushButton("Test", this);
>> hLayout->addWidget(myLabel);
>> hLayout->addWidget(myButton);
>>
>> QGLWidget *myOPenGLWidget = new QGLWidget(this);
>> // QOpenGLWidget *myOPenGLWidget = new QOpenGLWidget(this);// this
>> causes bad app rendering on Remote Desktop
>>
>> vBoxLayout->addItem(hLayout);
>> vBoxLayout->addWidget(myOPenGLWidget);
>> }
>>
>> When I use QGLWidget the widgets are properly rendered, as you can see
>> in the attached image. When I replace the QGLWidget with its counter
>> part QOpenGLWidget then the whole app is fully black when launched
>> through remote desktop (on Windows), no widget is rendered (see other
>> image attached). If I run the application on my local machine, then
>> everything is properly rendered.
>>
>> Am I doing something wrong? Or is this a limit/bug in Qt (I'm using
>> latest Qt version, 5.4.1)?
>>
>> This is my main
>>
>> int main( int argc, char *argv[] )
>> {
>> QApplication appMain(argc, argv);
>>
>> MyWidget *mainWin = new MyWidget;
>> mainWin->show();
>>
>> return appMain.exec();
>> }
>>
>> I enabled qt.qpa.gl debugging and this is the output of the application
>> in the two cases.
>>
>> Output in case of QGLWidget enabled:
>> [...]
>> qt.qpa.gl: QWindowsIntegration::createPlatformOpenGLContext
>> QSurfaceFormat(version 2.0, options QFlags(), depthBufferSize 1,
>> redBufferSize -1, greenBufferSize -1, blueBufferSize -1, alphaBufferSize
>> -1, stencilBufferSize 1, samples -1, swapBehavior 2, swapInterval -1,
>> profile 0)
>> qt.qpa.gl: Qt: Using WGL and OpenGL from "opengl32.dll"
>> qt.qpa.gl: QOpenGLStaticContext::create OpenGL: "Microsoft
>> Corporation","GDI Generic" default ContextFormat: v1.1 profile: 0
>> options: QFlags(0x4)
>> Extensions: 3
>> qt.qpa.gl: QWindowsGLContext::QWindowsGLContext 0x6be850 GDI
>> requested: QSurfaceFormat(version 2.0, options QFlags(),
>> depthBufferSize 1, redBufferSize -1, greenBufferSize -1, blueBufferSize
>> -1, alphaBufferSize -1, stencilBufferSize 1, samples -1, swapBehavior 2,
>> swapInterval -1, profile 0)
>> obtained # 8 GDI QSurfaceFormat(version 1.1, options QFlags(0x4),
>> depthBufferSize 16, redBufferSize 8, greenBufferSize 8, blueBufferSize
>> 8, alphaBufferSize 8, stencilBufferSize 8, samples -1, swapBehavior 2,
>> swapInterval 1, profile 0)
>> PIXELFORMATDESCRIPTOR dwFlags=0x465 PFD_DRAW_TO_WINDOW
>> PFD_SUPPORT_OPENGL PFD_GENERIC_FORMAT PFD_DOUBLEBUFFER iPixelType=0
>> cColorBits=32 cRedBits=8 cRedShift=16 cGreenBits=8 cGreenShift=8
>> cBlueBits=8 cBlueShift=0 cDepthBits=16 cStencilBits=8 iLayerType=0
>> cAlphaBits=8 cAlphaShift=0 cAccumBits=64 cAccumRedBits=16
>> cAccumGreenBits=16 cAccumBlueBits=16 cAccumAlphaBits=16 swap interval: -1
>> default: ContextFormat: v1.1 profile: 0 options: QFlags(0x4)
>> HGLRC=0x20000
>> [...]
>>
>> Output in case of QOpenGLWidget enabled:
>> [...]
>> qt.qpa.gl: QWindowsIntegration::createPlatformOpenGLContext
>> QSurfaceFormat(version 2.0, options QFlags(), depthBufferSize -1,
>> redBufferSize -1, greenBufferSize -1, blueBufferSize -1, alphaBufferSize
>> -1, stencilBufferSize -1, samples -1, swapBehavior 0, swapInterval 1,
>> profile 0)
>> qt.qpa.gl: Qt: Using WGL and OpenGL from "opengl32.dll"
>> qt.qpa.gl: QOpenGLStaticContext::create OpenGL: "Microsoft
>> Corporation","GDI Generic" default ContextFormat: v1.1 profile: 0
>> options: QFlags(0x4)
>> Extensions: 3
>> qt.qpa.gl: QWindowsGLContext::QWindowsGLContext 0x4c0e68 GDI
>> requested: QSurfaceFormat(version 2.0, options QFlags(),
>> depthBufferSize -1, redBufferSize -1, greenBufferSize -1, blueBufferSize
>> -1, alphaBufferSize -1, stencilBufferSize -1, samples -1, swapBehavior
>> 0, swapInterval 1, profile 0)
>> obtained # 7 GDI QSurfaceFormat(version 1.1, options QFlags(0x4),
>> depthBufferSize 32, redBufferSize 8, greenBufferSize 8, blueBufferSize
>> 8, alphaBufferSize 8, stencilBufferSize 8, samples -1, swapBehavior 2,
>> swapInterval 1, profile 0)
>> PIXELFORMATDESCRIPTOR dwFlags=0x465 PFD_DRAW_TO_WINDOW
>> PFD_SUPPORT_OPENGL PFD_GENERIC_FORMAT PFD_DOUBLEBUFFER iPixelType=0
>> cColorBits=32 cRedBits=8 cRedShift=16 cGreenBits=8 cGreenShift=8
>> cBlueBits=8 cBlueShift=0 cDepthBits=32 cStencilBits=8 iLayerType=0
>> cAlphaBits=8 cAlphaShift=0 cAccumBits=64 cAccumRedBits=16
>> cAccumGreenBits=16 cAccumBlueBits=16 cAccumAlphaBits=16 swap interval: -1
>> default: ContextFormat: v1.1 profile: 0 options: QFlags(0x4)
>> HGLRC=0x20000
>> QOpenGLShaderProgram: could not create shader program
>> QOpenGLShader: could not create shader
>> bool __thiscall QOpenGLTextureBlitter::create(void) Could not link
>> shader program:
>> ""
>> QOpenGLBuffer::bind(): buffer not created
>> QOpenGLBuffer::release(): buffer not created
>> QOpenGLBuffer::bind(): buffer not created
>> QOpenGLBuffer::release(): buffer not created
>> [...]
>>
>> Thanks in advance for your help!
>> Calogero
>>
>> --
>> Calogero Mauceri
>> Software Engineer
>>
>> Applied Coherent Technology Corporation (ACT)
>> www.actgate.com
>>
--
Calogero Mauceri
Software Engineer
Applied Coherent Technology Corporation (ACT)
www.actgate.com
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