Trigger Rally GL|ES on i.MX6Q

Trigger Rally, "a fast-paced free software rally racing game", was ported some time ago to OpenGL|ES on Open Pandora by ptitSeb. Here's a link to the SourceForge browser at Revision: 96 where the Pandora branch was made. With a bit of additional footwork, I was able to build it on an i.MX6 quad-core and it seems to run pretty well. Trigger Rally has undergone considerable development since that branch was made, so it might be a good exercise to forward-port those GL|ES patches to the current version! 

Build Environment
The build environment is hosted on an i.MX6 quad-core platform running Debian “jessie” release. The system relies on closed-source VIVANTE GPU libraries for Freescale i.MX6 being installed. Please see previous posts for details on setting up the root file system to support accelerated GL/GLES functionality in Debian.

Prerequisite  Binary Packages

apt-get install cmake jam libsdl-image1.2-dev libopenal-dev libalut-dev libphysfs-dev

Build GLU ES 

TR depends on GLU ES implementation (gluScaleImage) - latest source ported by lunixbochs (GLU ES version 1.5 based on original GLU 1.3) is on GitHub. 

git clone https://github.com/lunixbochs/glues.git
cd glues ; rm -f CMakeCache.txt ; cmake . ; make

If the build is successful, the library file libGLU.so.1 will have been created. There is no install target - maybe there is better way, but I simply copy the two needed header files so they will be found by the build in a system include path:

cp lunixbochs/glues/source/glues.h  /usr/local/include/GLES/
cp lunixbochs/glues/include/SDL/SDL_opengles.h  /usr/local/include/SDL/

Build TR
Define LINUX in trigger-rally-pandora/Jamrules; otherwise header file /usr/include/EGL/eglvivante.h (part of Freescale imx-gpu-viv bundle) throws an #error "Platform not recognized":

sed -i 's/COMPILER_CFLAGS += -Wall/COMPILER_CFLAGS += -Wall -DLINUX=1/' Jamrules

Please note that this project uses jam (and not make) as build tool:
./configure ; jam

If you did not copy over the header files from GLU ES, you are probably seeing a couple of errors from the build:

src/pengine/pengine.h:39:24: fatal error: GLES/glues.h: No such file or directory

/usr/local/include/GLES/glues.h:37:33: fatal error: SDL/SDL_opengles.h: No such file or directory

Eventually, the linker fails due to library specification -lGLUES_CM:

/usr/bin/ld: cannot find -lGLUES_CM
collect2: error: ld returned 1 exit stat

Rather than take the time to tweak the jam scripts to fix the problem correctly, immediate gratification is had by manually linking the trigger executable in the shell: remove -lGLUES_CM from the linker invocation, as well as the library path specification -L/usr/lib/arm-linux-gnueabihf, and link directly to the GLU  ES library libGLU.so.1 as follows:

g++ -Wall -DLINUX=1 -O3   -DDATADIR='"${prefix}/share"' -DHAVE_GLES -DPANDORA  -o trigger ./out/armv7l-unknown-linux-gnu/opt/src/trigger/eglport.o ./out/armv7l-unknown-linux-gnu/opt/src/trigger/game.o ./out/armv7l-unknown-linux-gnu/opt/src/trigger/main.o ./out/armv7l-unknown-linux-gnu/opt/src/trigger/render.o ./out/armv7l-unknown-linux-gnu/opt/src/trigger/menu.o  ./out/armv7l-unknown-linux-gnu/opt/src/pengine/libpengine.a ./out/armv7l-unknown-linux-gnu/opt/src/psim/libpsim.a   -lSDL -lSDL_image -lEGL -lGLES_CM  -lopenal -lalut -lphysfs ../glues/lunixbochs/glues/libGLU.so.1 

(use jam -n to get the g++ command)

Success!

No need to run the make install, the trigger executable will run fine if invoked from within the project "./data" directory:

cd data ; ln -s ../trigger

xrandr -s 800x600   # TODO: it can't seem to change resolution on it's own!
LIBGL_DEBUG=verbose ./trigger



Enjoy!