[Buildroot] buildroot EGLFS support

[Buildroot] buildroot EGLFS support

[Tomaž Smodiš]

Hi

With help of Mr. Richard Ash I managed to build my buildroot Os.

With the same compiler I buidl/compiled Qt libraries against buildroot 
sysroot.

I was finally able to run some cpp code. I successfully ran Qt console 
application.

However if I try to run Qt GUI Application I got errors. I enabled eglfs 
support in menuconfig:

In target packages, graphic libraries and applications I enabled mesa3d 
option Gallium swrast driver and OpenGL EGL and OpenGL ES options.

I ran make successfully, deployed to Raspberry Pi 3 b+ but after I run 
my app with:

strace ./myapp -platform eglfs

I got errror:

write(2, "EGL library doesn't support Emul"..., 48EGL library doesn't 
support Emulator extensions

Any advice?

kind regards Thomas

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Re: [Buildroot] buildroot EGLFS support

[Peter Seiderer]

Hello Tomaž,

On Mon, 24 Jan 2022 16:28:00 +0100, Tomaž Smodiš <tomazsmodis73@hotmail.com> wrote:

> Hi
> 
> With help of Mr. Richard Ash I managed to build my buildroot Os.
> 
> With the same compiler I buidl/compiled Qt libraries against buildroot 
> sysroot.

Why compile outside of buildroot? Qt is well integrated into buildroot
(as Richard already pointed out [1])...

> 
> I was finally able to run some cpp code. I successfully ran Qt console 
> application.
> 
> However if I try to run Qt GUI Application I got errors. I enabled eglfs 
> support in menuconfig:
> 
> In target packages, graphic libraries and applications I enabled mesa3d 
> option Gallium swrast driver and OpenGL EGL and OpenGL ES options.

Why swrast and not 'Gallium vc4 driver'?

> 
> I ran make successfully, deployed to Raspberry Pi 3 b+ but after I run 
> my app with:
> 
> strace ./myapp -platform eglfs
> 
> I got errror:
> 
> write(2, "EGL library doesn't support Emul"..., 48EGL library doesn't 
> support Emulator extensions
> 
> Any advice?

My 'standard' RPi3 (64-bit) buildroot test configuration is like the following:

BR2_aarch64=y
BR2_ARM_FPU_VFPV4=y
BR2_OPTIMIZE_3=y
BR2_TOOLCHAIN_BUILDROOT_GLIBC=y
BR2_PACKAGE_HOST_LINUX_HEADERS_CUSTOM_5_10=y
BR2_PACKAGE_GLIBC_UTILS=y
BR2_GCC_VERSION_11_X=y
BR2_TOOLCHAIN_BUILDROOT_CXX=y
BR2_ROOTFS_DEVICE_CREATION_DYNAMIC_EUDEV=y
BR2_SYSTEM_DHCP="eth0"
BR2_GENERATE_LOCALE="en_US"
BR2_ROOTFS_POST_BUILD_SCRIPT="board/raspberrypi3-64/post-build.sh"
BR2_ROOTFS_POST_IMAGE_SCRIPT="board/raspberrypi3-64/post-image.sh"
BR2_LINUX_KERNEL=y
BR2_LINUX_KERNEL_CUSTOM_TARBALL=y
BR2_LINUX_KERNEL_CUSTOM_TARBALL_LOCATION="$(call github,raspberrypi,linux,0b54dbda3cca2beb51e236a25738784e90853b64)/linux-0b54dbda3cca2beb51e236a25738784e90853b64.tar.gz"
BR2_LINUX_KERNEL_DEFCONFIG="bcmrpi3"
BR2_LINUX_KERNEL_DTS_SUPPORT=y
BR2_LINUX_KERNEL_INTREE_DTS_NAME="broadcom/bcm2710-rpi-3-b broadcom/bcm2710-rpi-3-b-plus broadcom/bcm2837-rpi-3-b"
BR2_LINUX_KERNEL_NEEDS_HOST_OPENSSL=y
BR2_PACKAGE_STRACE=y
BR2_PACKAGE_DEJAVU=y
BR2_PACKAGE_MESA3D=y
BR2_PACKAGE_MESA3D_GALLIUM_DRIVER_VC4=y
BR2_PACKAGE_MESA3D_OPENGL_ES=y
BR2_PACKAGE_QT5=y
BR2_PACKAGE_QT5BASE_EXAMPLES=y
BR2_PACKAGE_QT5BASE_OPENGL_LIB=y
BR2_PACKAGE_QT5BASE_EGLFS=y
BR2_PACKAGE_QT5BASE_DEFAULT_QPA="eglfs"
BR2_PACKAGE_QT5BASE_FONTCONFIG=y
BR2_PACKAGE_QT5BASE_HARFBUZZ=y
BR2_PACKAGE_QT5BASE_GIF=y
BR2_PACKAGE_QT5BASE_JPEG=y
BR2_PACKAGE_QT5BASE_PNG=y
BR2_PACKAGE_QT5QUICKCONTROLS=y
BR2_PACKAGE_QT5QUICKCONTROLS2=y
BR2_PACKAGE_RPI_FIRMWARE=y
BR2_PACKAGE_RPI_FIRMWARE_BOOTCODE_BIN=y
BR2_PACKAGE_RPI_FIRMWARE_VARIANT_PI=y
BR2_PACKAGE_RPI_FIRMWARE_CONFIG_FILE="board/raspberrypi3-64/config_3_64bit.txt"
BR2_TARGET_ROOTFS_EXT2=y
BR2_TARGET_ROOTFS_EXT2_4=y
BR2_TARGET_ROOTFS_EXT2_SIZE="384M"
# BR2_TARGET_ROOTFS_TAR is not set
BR2_PACKAGE_HOST_DOSFSTOOLS=y
BR2_PACKAGE_HOST_GENIMAGE=y
BR2_PACKAGE_HOST_MTOOLS=y

Needs only the added 'dtoverlay=vc4-kms-v3d' to the boot-partition
config.txt file, most provided Qt gui examples run fine, e.g.

	/usr/lib/qt/examples/gui/analogclock/analogclock

or

	/usr/lib/qt/examples/quickcontrols2/gallery/gallery

etc.

Regards,
Peter

[1] http://lists.busybox.net/pipermail/buildroot/2022-January/634093.html


> 
> kind regards Thomas
> 
> _______________________________________________
> buildroot mailing list
> buildroot@buildroot.org
> https://lists.buildroot.org/mailman/listinfo/buildroot

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