Qt with openGL|ES on OMAP-L138 under Linux

Du Chengyang

Other Parts Discussed in Thread: OMAP-L138, OMAPL138

Hi, everyone!

I am trying to use OpenGL|ES in an Qt application on my OMAP-L138 board. Among the common OpenGL|ES methods, I choose PicoGL library.

Now, I have successfully compiled the PicoGL library, and run the examples of PicoGL on my OMAP-L138 board. After that, I try to build a new qmake of Qt which can support the OpenGL|ES, but I fail.

Here are the codes in qmake.conf related to OpenGL configuration:

QMAKE_INCDIR_GL = /home/tl/PicoGL/include
QMAKE_LIBDIR_GL = /home/tl/nonePicoGL/lib
QMAKE_LIBS_GL = -libPicoGL -libPicoGLU

And I also add "-opengl" or ''-opengl es1" or "-opengl es2" when configuring my qmake. But I still get an error:

The OpenGL ES 1.x functionality test failed!
You might need to modify the include and library search paths by editing
QMAKE_INCDIR_OPENGL, QMAKE_LIBDIR_OPENGL and QMAKE_LIBS_OPENGL in
/home/tl/qt/qt-everywhere-opensource-src-4.7.0/mkspecs/qws/linux-omapl138-g++.

I am so confused about it, and could not find a solution on the Internet. So does anyone have an idea? Please share with me. Thank you.

over 10 years ago

0 Sivaraj Kuppuraj over 10 years ago

TI__Mastermind 35645 points

Hi,

Moving your post to right forum to be better answered.

Thanks & regards,

Sivaraj K

0 Du Chengyang over 10 years ago in reply to Sivaraj Kuppuraj

Prodigy 200 points

Hi, please tell me which forum I should go.

0 Titusrathinaraj Stalin over 10 years ago

TI__Guru** 116100 points

Hi Du,

I think, OMAPL138 device does not support openGL since it doesn't have SGX support.

http://processors.wiki.ti.com/index.php/Building_Qt#Building_Qt_with_OpenGL_ES_accelerated_by_SGX

I let you know after discussed with internal team.

0 Du Chengyang over 10 years ago in reply to Titusrathinaraj Stalin

Prodigy 200 points

Hi, Titus

Thank you for your answer. Actually I have successfully run some OpenGL examples on OMAP-L138. I know that OMAP-L138 don't support SGX, but it can still support the OpenGL through software. As long as the cross compile tool support soft float, the PicoGL library is executable on OMAP-L138.

Here is the address of PicoGL's source code , you can have a try(http://people.openmoko.org/jserv/graphics/picogl-20051108.tar.bz2。).

Before compiling, you should first fix some bugs and do some modifications, which shown below.

At the beginning of backends/vesafb/tk.c, you should add: #define _FB_TK_

Then, in backends/vesafb/glx_impl.h, you should replace:

struct fb_fix_screeninfo FixedInfo;

struct fb_var_screeninfo VarInfo, OrigVarInfo;

with:

#ifdef _FB_TK_

struct fb_fix_screeninfo FixedInfo;

struct fb_var_screeninfo VarInfo, OrigVarInfo;

#else

extern struct fb_fix_screeninfo FixedInfo;

extern struct fb_var_screeninfo VarInfo, OrigVarInfo;

#endif

Then in include/GL/glx.h

replace #include GLX_IMPL_HEADER, with a method that can include the path of "backends/vesafb/glx_impl.h"

Finally, please modify VarInfo setting in "initialize_fbdev" function of backends/vesafb/tk.c, and make it is suitable to your LCD screen.

And you can compile the library (Please notice that the cross compile tool MUST support software float, and arm-none-linux - gnueabi-gcc-4.3.3 is appropriate). After compiling, you should copy the generated shared libraries to the /lib/ of the ARM's rootfs, and copy the generated examples to anywhere you want on board. Then you can run the example.

So the question remained is how to combine OpenGL and Qt on my OMAP-L138. I cannot make a right configuration for qmake that can both support the OpenGL and ARM. So I really hope that your team can help me, and work this out. Thank you!

0 Titusrathinaraj Stalin over 10 years ago in reply to Du Chengyang

TI__Guru** 116100 points

Hi,

I can understand.

If we want to build QT with openGL then we need to satisfy (prerequisites) the qmake configurations with some graphics but this requires SGX or graphics libraries which OMAPL138 doesn't have.

http://processors.wiki.ti.com/index.php/Building_Qt_with_OpenGL_ES_accelerated_by_SGX#Prerequisites

http://qt-project.org/doc/qt-4.8/examples-opengl.html

If you refer to the above QT link, that says, we need hardware acceleration requires for QT with openGL implementation.

Though, I asked to one of my colleague regarding this and let you know.

0 Du Chengyang over 10 years ago in reply to Titusrathinaraj Stalin

Prodigy 200 points

Hi,

I think I can understand now. It seems that SGX is necessary for Qt which can support OpenGL. OMG, if it is true, I may have to change a board. I will wait for your answering. Thank you.

0 Titusrathinaraj Stalin over 10 years ago in reply to Du Chengyang

TI__Guru** 116100 points

Hi Du,

http://processors.wiki.ti.com/index.php/Building_Qt#Qt_4.5.x_Embedded_Linux:_Configuration_for_OMAP-L137

If you see the above link, they have configured the QT without openGL support "-no-opengl"

./configure -prefix /opt/qt -embedded arm -platform /qws/linux-x86-g++ -xplatform /qws/linux-omapl1-mv-g++ -qt-kbd-usb -depths 16 -no-cups -no-largefile -no-accessibility -no-opengl -no-openssl

If you really need processor with SGX hw accelerated graphics support then I would like to suggest You to use AM335x processor which is ARMV7 arch and support almost everything and having lot of TI wikis and documentation and forum support as well. :-)

http://e2e.ti.com/support/arm/sitara_arm/f/default.aspx

http://processors.wiki.ti.com/index.php/Building_Qt_with_OpenGL_ES_accelerated_by_SGX

http://processors.wiki.ti.com/index.php?title=Sitara_Linux_Software_Developer%E2%80%99s_Guide&oldid=171586

0 Du Chengyang over 10 years ago in reply to Titusrathinaraj Stalin

Prodigy 200 points

Hi,

Thank you for your answer. I think it is unavoidable for me to change a board now. Now I have a PandaBoard ES Rev B3, which has an OMAP4430. I think it is suitable for Qt and OpenGL function. Is that right?

0 Titusrathinaraj Stalin over 10 years ago in reply to Du Chengyang

TI__Guru** 116100 points

I hope it would work.

http://processors.wiki.ti.com/index.php/Graphics_SDK_Quick_installation_and_user_guide#AM45x_.28Panda_board.29

0 Du Chengyang over 10 years ago in reply to Titusrathinaraj Stalin

Prodigy 200 points

Thank you for your help, and I will verify your answer.

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Qt with openGL|ES on OMAP-L138 under Linux