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159 lines
5.1 KiB
Markdown
159 lines
5.1 KiB
Markdown
Compile
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=======
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To compile the Godot templates on a Pi, start from the official
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3.1-stable source tarball:
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<https://github.com/godotengine/godot/releases/tag/3.1-stable>
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These packages should be enough:
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$ sudo apt-get install build-essential scons pkg-config libx11-dev libgles2-mesa-dev libasound2-dev libfreetype6-dev libudev-dev libpng12-dev zlib1g-dev clang
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## Compile Godot (X11)
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To compile the official X11 platform, this is, in theory, what you should do:
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$ cd ~/godot-3.1-stable
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$ scons platform=x11 target=release tools=no -j 4
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In practice, it is better to give the compiler some flags to better target
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the CPU of the Pi, and especially its FPU.
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For example (Pi 2/3):
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$ scons platform=x11 target=release tools=no CCFLAGS="-mcpu=cortex-a7 -mfpu=neon-vfpv4 -mfloat-abi=hard -mlittle-endian -munaligned-access" -j 4
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Or (Pi 1/Zero):
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$ scons platform=x11 target=release tools=no CCFLAGS="-mcpu=arm1176jzf-s -mfpu=vfp -mfloat-abi=hard -mlittle-endian -munaligned-access" -j 4
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You might need to use clang on some versions of debian. If so, add:
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use_llvm=yes
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You might also need to disable some modules, for example:
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module_webm_enabled=no
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See `release.sh` for the options that are used to generate the official
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FRT release binaries, keeping in mind that they are generated on a
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debian jessie chroot environment (gcc 4.9.2, so there is no need to use clang)
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and that SSL is disabled (so you might want to omit the relevant options if
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you want to enable it).
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## Compile Godot (FRT)
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FRT can be compiled against the Godot engine source as it is.
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However there are some optional patches that you might want to apply
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to the engine. See the `patches` directory. FRT release binaries are
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generated applying the patches.
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Go to the platform directory and clone this repository:
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$ cd ~/godot-3.1-stable
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$ cd platform
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$ git clone https://github.com/efornara/frt
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From the main directory, you now have a new "platform" available:
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$ cd ~/godot-3.1-stable
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$ scons platform=frt target=release frt_arch=pi3 -j 4
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Unlike the X11 platform, FRT disables tools by default and preselect
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some CPU-specific options according to frt\_arch.
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When compiling on a real Pi, using an external Hard Disk is
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strongly advised: everything is faster and more reliable, and you can
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enable a swap partition without stressing the Memory Card.
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Swap is hardly used, especially if you start Raspbian without the GUI,
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but enabling it allows you to use `-j 4` and leave the compilation
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unattended.
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Compiling godot-3.1-stable + FRT from scratch on a non-overclocked
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Pi 3 running Raspbian jessie should take about one hour.
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## Compile Godot (FRT) to run on a PC
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On some Linux systems, FRT can run on a desktop. This can be useful
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to test the ES 2.0 rendering pipeline directly on a PC.
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Intel IGPs are known to work.
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Just repeat the steps above from your Linux PC and build FRT without
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setting the architecture:
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$ scons platform=frt target=release -j 8
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## Cross compile (QEMU)
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These are a few notes on how to cross-compile FRT on a PC running debian
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stable (stretch). A standard armv7 debian is used as a target. See
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below on tips on using Raspbian as a target.
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There might be better ways, and compilation is quite slow
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(around 5 hours to compile godot-2.1.4-stable from scratch on a,
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quite slow, Acer C7 C710-2847).
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The official FRT release binaries are not cross-compiled. They are generated
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on a Pi.
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Familiarity with the Linux environment is assumed.
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Notes based on
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<https://wiki.debian.org/EmDebian/CrossDebootstrap>
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Install debootstrap and qemu:
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[host] # apt-get install binfmt-support qemu qemu-user-static debootstrap
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Download and install the base system:
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[host] # cd /opt
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[host] # mkdir arm7hf
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[host] # qemu-debootstrap --arch armhf jessie arm7hf http://deb.debian.org/debian
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Mount the proc filesystem:
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[host] # mount -t proc proc /opt/arm7hf/proc
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Chroot into the system and create a user (with uid/gid matching your main
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user on the host; no action should be required if your main user is the
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first user created):
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[host] # LC_ALL=C chroot /opt/arm7hf bash
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[chroot] # adduser user
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...
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Install the needed packages:
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[chroot] # apt-get update
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[chroot] # apt-get upgrade -y
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[chroot] # apt-get install -y build-essential scons pkg-config libx11-dev libgles2-mesa-dev libasound2-dev libfreetype6-dev libudev-dev libpng12-dev zlib1g-dev
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From another terminal, and using your main user on the host (note the `$`
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prompt), clone the Godot and FRT repositories:
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[host] $ cd /opt/arm7hf/home/user
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[host] $ git clone https://github.com/efornara/godot 3.0-gles2
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[host] $ cd 3.0-gles2/platform
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[host] $ git clone https://github.com/efornara/frt
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Back on the chroot environment, compile Godot:
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[chroot] # su - user
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[chroot] $ cd 3.0-gles2
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[chroot] $ nice scons platform=frt target=release frt_arch=arm7hf module_webm_enabled=no builtin_freetype=yes -j 2
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...
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### Raspbian
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- Download the Raspbian keyring and use it with qemu-debootstrap
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- Check the chroot `/etc/apt/source.list` after debootstrap, and reset it
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to the Raspbian repository if needed.
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### BCM
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- Download the raspberry firmware to compile BCM support. Only the
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include directory (`/opt/vc/include`) is needed as the libraries are
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dynamically loaded.
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