QT5 with EGLFS - WebGL not working

prabindh

WebGL is indeed available in non-X platforms.

When you built Webkit - did the configure step show WebGL-yes, as shown in my configuration below ?

http://www.gpupowered.org/node/15

nvharisha

It configures WebGL but for EGLFS, it lacks implementation of GLSruface and GLContext.
Hence when HTML request webgl-context, it returns null .

prabindh

You can use the (dirty) patchset attached to the bug report at,

https://bugreports.qt-project.org/browse/QTBUG-30405

I will update some of the patches soon,

prabindh

Can you please check now - I have updated ? For some reason, comments did not get posted, or I might have closed the window too soon earlier.

nvharisha

Actually, I tried to create a EGLContext and EGLSurface in the 3DPrivate class. But it requires the QOpenGLContext class.

Hence I tried deriving class QPlatformOpenGLContext. But with this setContext() is called from QOpenGLContext. This is done in QOpenGLContext::create(), which takes: QGuiApplicationPrivate::platformIntegration()->createPlatformOpenGLContext(this); to set the context.

So just introduce a QGLWidget. Now this shows only WebGL screen and not "blending" with the actual screen.

I will take look at your changes. Mean while if you have any suggestion, let me know.

nvharisha

With the patch, I was not able to run the GL pages.
First, while compiling I had to disable inclusion of X libraries.
After running swapbuffer() was giving the error:
@
QOpenGLContext::swapBuffers() called with non-opengl surface
QOpenGLContext::swapBuffers() called with non-opengl surface
QOpenGLContext::swapBuffers() called with non-opengl surface
QOpenGLContext::swapBuffers() called with non-opengl surface
...
...
@

I was trying to run:

"http://www.erpoyart.com/jsdyn/":http://www.erpoyart.com/jsdyn/

prabindh

Can you please post the command line you are using to run ?

nvharisha

@./QtTestBrowser -graphicsbased -gl-viewport -webgl http://www.erpoyart.com/jsdyn/@

nvharisha

Actually I was checking .. looks like even though it prints the error which i have reported for some time, but later i see that FPS saying that as per App, WebGL is working. But its not visible. I just put a print in the
@
GraphicsSurface::platformPaintToTextureMapper
@

and its printing.

Does that mean only "display" or final blit on to surface is not happening??

Carewolf

"QOpenGLContext::swapBuffers() called with non-opengl surface"

Can be solved by marking all EGLFSWindows as OpenGLSurface in qeglfswindow.cpp.

prabindh

Hello Hari,

Its been a while since I worked on this, I found that qt5.1.x has an issue with WebGL that needs a fix in the eglfs plugin that causes the issue you mention below. I posted my patch-set here:

https://github.com/prabindh/qt-configs/tree/master/webgl_5.1.1

You also need to take in the qeglfswindow patch2 from below:

https://github.com/prabindh/qt-configs/tree/master/qt5_1_1_Sep13

bq. >> Actually I was checking .. looks like even though it prints the error which i have reported for some time, but later i see that FPS saying that as per App, WebGL is working. But its not visible

elkhunter

Hi Prabindh,

How are your eglfs patches licensed? Can they be used with the commercial version of QT? Or are your patches GPL only?

Thanks in advance.

prabindh

There is a Qt5 contributor agreement that I have to go through when I find some time. You might want to check with the Qt5 dev community on (1) the status of these patches if the agreement is not yet signed, and (2) does a patch apply concurrently on both commercial/LGPL or not.

SGaist

Hi,

Since you have found a fix for these bugs, why not submit the patches ? Once they are approved they will be integrated so everybody can benefit from them