Developer diary

Alien Blitz: PC/Mac alpha has been added to the download page

Just a quick news: I’ve added Alien Blitz (for Windows/Linux/Mac) to the private  download page on

You can access this page if I gave you a key or if you have bought Snorms on Desura (use the connect button here:


I have just uploaded it there so that I can give it to a bit more people easily (for testing purposes), it will come later on IGS (along with Snorms) and the free demo version will be publicly available also later (it will be available on the Steam greenlight page).

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Desura: get your key before it’s too late !

Desura had quite some troubles lately, after being bought and sold a few times it is now in bankruptcy.

The site is still up and downloads are available, but I have no idea for how long, so I made a process for people who bought Snorms there and don’t want to everything.
Sadly I can’t get the list of users who bought the game, so I can’t contact them nor can I check if they have really bought the game later on if the Desura website goes down.

So, here’s the process to get a key on this/my website :

  • Log in on Desura website
  • Go to
  • Click the “Connect Game” button
  • It will redirect you to a URL like :
  • Bookmark the resulting page (or just write the URL somewhere, or send it to you by mail,…)

On this page you can  already :

  • Download Alien Blitz for Android
  • Download Snorms for PC (Windows/Linux/Mac)

And soon you will also get Alien Blitz for PC there, and Steam key if Alien Blitz comes to Steam.

So use the connect button quickly and keep the page URL !

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Alien Blitz: level 1, alpha progress

Level 1

The first level has been slightly updated


The progression is made easier for new players:

  • First room just teaches about buttons, not buttons & monsters at the same time, and player is forced to go there
  • Second room teaches about monsters, only one way out too
  • Then a small open space with multiple directions, but animation player saw by pushing the button should make them understand where to go now
  • Then the room with the button to the end has a new exit that goes to the southern outside area, and this exit is located near the money box, so player should have seen it (otherwise it’s not important, it’s just some goodies)

Second level is pretty straight forward, so no changes needed, and by third level player should know how to play :)


Alpha progress

I’ve corrected a few glitches, but other than that the game seems to work fine on Windows/Linux, it needs more testing on OS X still (but my mac mini is too slow, I tried doing some hackintosh virtual machines but had no success (no guest additions and slow on Virtualbox, crashes on VMWare)).

I have very random problems with the Level editor on Linux, no idea why, the level editor just exits, no exception, no core dump, nothing. So I suspect it’s another OpenGL crash that will be very hard to pinpoint.
I’ve updated LibGdx to latest version, and removed all threads (except the main one), maybe it will help. Anyway Level editor is not top priority, if it doesn’t work on some config it’s no big deal at the moment.

So, current status is that I need to continue testing, and if everything goes well there should be an alpha version soon (demo on Greenlight, full version as a gift with Snorms)

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Alien Blitz: loading screen, color/scale, builds

Loading screen

New level loading screen, the old one was still using some graphics I did at the beginning of Snorms development

capture_2015-05-14_11-20-27_0979_Alien_Blitz_ capture_2015-05-14_11-20-31_0314_Alien_Blitz_

There’s no more indication of what is being loaded (the 4 old steps), and no percentage (which was not accurate because of the 4 different loading steps), just a loading bar that is somewhat accurate.

There’s also a nicer fade out effect at the end of loading screen.


Color / scale

Color of the mecha has been slightly changed, a bit less saturated, and the blue part is a bit more visible.


And everything has been slightly scaled up (10% for most items, except for player that is scale 20%)




I am finally using an official JRE for MacOs, and OpenJDK for Windows/Linux, it seems to work fine that way. I had some troubles initializing a CubeMap framebuffer on Mac, but it’s corrected now (I will have to update my tutorial accordingly).

I’m continuing tests on PC, so far I just have some unknown errors with the level editor.

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Alien Blitz: mobile update & PC alpha

There was quite a lack of updates lately, I have a new job and didn’t want to spend too much time on personal projects for the first days/weeks.

But now it should be okay, I should have enough free time to work on games. My first priority is to complete Alien Blitz (making an Alpha version for PC and work on PR stuff)


Mobile update

Since the random bug I discovered on PC doesn’t affect mobile (and is now corrected) I’ve continued working on the last update for Android, it’s okay now and has been pushed on all available platforms:

I will do a few more tests on recent iPhone devices soon, but as far as I know everything should be good (I just have to update the store page that doesn’t display enough screenshots).


PC alpha

I’ve continued thinking about the PC version, and came up to the conclusion that I will soon release an alpha version, I call it alpha as it will be missing some functions and might contain bugs, other than that it should be fairly complete (except if I get interesting suggestions).

Another difference with final release is that there is a welcome screen every time you start the game with links to suggestion box & greenlight page.

I will also release a demo version, limited to episode 1 and without save feature.


I’ve also changed a few things :

  • There are now 3 fonts used within the game
    • Fairfax (the old one, pixel looking, used in the title bar in above screenshot and some buttons)
    • Ubuntu mono (used on buttons and most controls)
    • Ubuntu (used on long texts, labels)
  • Moving the mouse will also move viewpoint, so on PC viewpoint is centered with mouse position (if using mouse) + mecha look at direction

Most of the build process (building, obfuscating, packaging) is ready, but now need testing:

  • Windows 32bits (exe)
  • Linux 32bits (sh)
  • Linux 64bits (sh)
  • MacOS 64 bits (command)

There is no installer, it’s just a zip to extract. I have some troubles with MacOS as OpenJDK seems to require X11 and will ask user to install it (once installed it’s ok), not sure if that is supported/accepted with Steam so I might have to do something else for Mac, as for now it should be sufficient (you can alter the .command file and point to a local jre installation instead)

This version will be published on IGS along with Snorms (as a “gift”, meaning you can still have the old isometric version or this one) and maybe also on Desura if I can make it work there (also along with Snorms). The demo version will be available directly from this website.

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Alien Blitz: back to normal operation

I’ve finally corrected my problem… to sum it up : changing mouse cursor too often in a small timestamp will cause glClear to crash with an Intel card with vsync disabled on Linux…

This whole sentence makes absolutely no sense to me but it explains why I didn’t have problems with nVidia card and why I didn’t have problems with the mobile version (which obviously doesn’t implement changing mouse cursor).

So I can now finish my tests of the Android version, update it, and I will probably create a beta PC version that I will add to Snorms version on IGS (maybe on Desura later on, if I fell like it), and also a demo version that I can freely distribute (episode 1 or just a few levels, or limited to 1 or 2 hours, don’t know yet).


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How to disable vsync on Intel card / Linux

Just a small post to explain how to disable vsync on an Intel integrated graphic card on Linux to run a java application from eclipse (or any other application for that matter).

You might have some problem for example if you run a LibGdx game and setting the vSyncEnabled configuration option does not work at all (don’t forget to also update foregroundFPS).

To run a program and disabling vsync it’s quite easy, just set the vblank_mode environment variable to 0, for example :

$ glxgears 
Running synchronized to the vertical refresh.  The framerate should be
approximately the same as the monitor refresh rate.
304 frames in 5.0 seconds = 60.797 FPS

$ vblank_mode=0 glxgears
ATTENTION: default value of option vblank_mode overridden by environment.
ATTENTION: default value of option vblank_mode overridden by environment.
27598 frames in 5.0 seconds = 5519.494 FPS

$ export vblank_mode=0
$ glxgears 
ATTENTION: default value of option vblank_mode overridden by environment.
ATTENTION: default value of option vblank_mode overridden by environment.
27929 frames in 5.0 seconds = 5585.793 FPS


To do the same thing to test an application under eclipse you can just change its run configuration :


Just set it to 1 when you are done (or delete the variable)


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Some news: Alien Blitz, Crazy Minecart, Shadow Mapping

Alien Blitz

There is a very random bug that causes the game to crash sometimes on PC, I can’t find why it happens, so until I find the cause I won’t release the next Android version (as it is random it might maybe also happen on Android).

This is a very strange bug, the game just suddenly stops, no exception, no dump, nothing, I’ve tried a few things:

  • I made sure System.exit is not called by adding it to a SecurityManager (override the checkExit function)
  • I made sure all exceptions are logged
  • I made sure OutOfMemory exceptions are trapped  somehow (-XX:+HeapDumpOnOutOfMemoryError)
  • All possible missing exceptions are catched using Thread.setDefaultUncaughtExceptionHandler

Only thing I have figured so far:

  • It’s not an audio issue (only error message is related to audio, but this message also appear when exiting the game normally, I just removed audio to be sure and bug happened anyway)
  • It’s not linked to a LibGdx version, bug appear on 1.4.1 & 1.5.2 also (and game was working fine when I was using these versions)
  • It doesn’t seem to appear on mobile version running on PC (but as it’s random I can’t be sure, I was just maybe lucky during these tests)

It is either linked to a change on my Linux system or something in the code (but there was nothing big added recently).
Next tests will focus on Windows (to see if it’s a problem on the Linux version) & on the nVidia card (to see if it’s related to the Intel one). I suspect something bad happening with OpenGL (would explain the lack of traces as it’s not pure java code).
Problem is each test takes around 1 hour as bug is random. I basically launch the game, make some automatic stuffs (auto fire, wake all monsters,…) and wait 1 minute, check if game exited prematurely, if not launch the test again. The bug seems to appear every 10 games on average, usually it will appear in the first minute or so after start, if it does not the game will apparently be running fine afterward (I’ve let it work for 2 hours fine)


On another note I updated the way life bars are displayed above player & monsters, they look a lot nicer now. And I have also added an option to show numerical values for life / armor & ammos.



Crazy Minecart

Some progress have been made on Crazy Minecart, I have some performance issues even without shadow mapping (40fps, it’s not a big deal but I don’t like that). So I removed some trees and simplified a few things, but I’ll have to pinpoint the issue.

capture_2015-04-08_10-58-46_0422_crazy_minecart_ capture_2015-04-08_10-58-51_0214_crazy_minecart_

I also need to change colors, problem is colors after exporting are not the ones I defined in Blender, it makes it a bit hard to do something nice.


Shadow Mapping

I’ve stopped working on part 5 (Multiple Render Targets) of shadow mapping tutorial for now, I’m just waiting for some commits to be included in LibGdx to support Cubemap, it will allow me to clean up the code and maybe add the MRT frame buffer more easily.

I saw this pull request recently, as I was about to make my own for the same purpose, good thing I checked up first :)

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Crazy Minecart : 3d test

Continuing on 3d version of Crazy Minecart I started tests on the game itself.

Exporting models

To export models from Blender I use a small script to export all models with a name starting with “export_”, they are all exported in the “exports” folder, in collada (.dae file)

This script is based on this post, I’ve modified it to export only objects with a name starting with “export_”, to move objects to origin, and to export to collada (as collada supports armature/animations, that could be needed for future projects)

import bpy

# get the path where the blend file is located
path = bpy.path.abspath('//')

# deselect all objects

# loop through all the objects in the scene
scene = bpy.context.scene
for ob in scene.objects:
    # make the current object active and select it = ob = True

    # make sure that we only export meshes
    if ob.type == 'MESH' and'export_'):
        # export the currently selected object to its own file based on its name
        bpy.ops.wm.collada_export(filepath=str(path + 'exports/' +'export_','') + '.dae'),selected=True,triangulate=True);
    # deselect the object and move on to another if any more are left = False

I’ve replaced the bottom timeline with the text editor in Blender, it makes running script easier (and I don’t know yet how timeline works). When executing script make sure you are in object mode, it won’t work in edit mode.



First tests

As I suspected I had problems updating Crazy Minecart, it was using an old version of libgdx and other libraries. LibGdx was easy to update (create a new project, copy old files), but mopub was a pain, their documentation is outdated and incomplete, so that doesn’t help. But it finally worked (not tested on ios yet, and I haven’t tested game centers yet, I just know it compiles…)

I am currently working on the title screen, it is easier to test there, first adding models :




Then adding some basic lighting :



The trees seems off, it’s because of back face culling (front faces are invisible, back faces that should be invisible are visible), I have no idea why but the normals are inverted :

  • In blender normals are correct
  • If I export as wavefront object with Blender and re-import it, on import model will have normals inverted
  • If I export as collada object in Blender, it is correct on re-import
  • If I convert the collada object to LibGdx format then normals will be inverted
  • If I invert normals on model and export it, it will be visible in the game but normals will still be off (the face in shadow will receive light, but not the one in light)

So I ended up recreating the tree from scratch, and this time it worked, I have no idea why the other tree is such a mess…

I also increased gap between ties as it doesn’t look good at high speed and I scaled / rotated trees randomly :



Inverting grass/dirt, it feels better at high speed :



Tuning lighting a bit (I still need to tune light direction, specular and “shininess”) and changing trees colors :



Adding some shadows (using an orthographic camera, to simulate sun light / directional light) :



Moving the light source position a bit :



At this point I began testing on my Nexus 7, sadly it is running at around 25fps… It is because of shadow mapping, writing to a FBO seems to be really slow even with simple models such as the ones I use. And this game really needs a stable 60fps.

I am currently continuing testing shadow mapping, and trying to improve performances, if I can’t get anything good I’ll try something else.

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Crazy minecart : more 3d (blender)

Continuing on testing 3d low-poly for Crazy Minecart, here is a blender rendered scene from behind


I think I will continue working on this update, as it will allow me to test stuff for the new engine I want to work one:

  • Real time shadow mapping (models are simple, so I hope I will be able to render scene at stable 60fps with shadow mapping)
  • Low poly lighting (shouldn’t be too hard)
  • Maybe try to reproduce this grainy look blender does, it looks really nice imo (click the image for 1080p version, it is more visible there)
  • And it will also help me test exporting multiple models at once with blender (through scripting) to automate this process.

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