I present to you our KrampusHack 2016 entry: "Dr. Evil F, Xmas edition" for Eric Johnson.

Entry including source and windows binary

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-- log --

The original wishlist I received was a confusing mix of half-retracted self-contradictory impossibilities

So I started from an isometric game, threw in a bunch of these keywords, add a sauce of Christmas, and presto.

As I already mentioned in the competition thread, I didn't write a game from scratch, but created an extension of our original TINS 2008 entry Dr. Evil F,
which is a bit like Desert Strike The rules of the competition were pretty open to allow this type of thing.

So what was added between the two competitons?

Between 2008 and 2016 I did bits of work on the code here and there - lots of bugfixes, and I ported it to Allegro 5. So even though it's old, the code was reasonably nice to work with.

The majority of effort went into adding a 3D mountainscape. The original is all a flat desert. For this competition I turned that into snowy mountains. I wrote functions to convert a height map to textured polygons, wrote a map generator, added collisions between objects and the map.

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The hardest part to get right was correctly interpolating the z coordinate in the middle of a tile.

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I added sound effects. Wanted to do music too, but I failed to get some inspiration for this...

Then we reworked it to the Christmas theme (Max helped here, she did the original graphics too). The objectives of each level were changed from bunkers to gifts (But you still have to shoot them to "open" them. Why would you shoot at a gift with a tank? No idea...) Tanks gained garlands. The main character got a Christmas hat. In addition to snowy mountain tops, we have fir trees and cosy log cabins to enhance the Christmas feel.

There is still room for improvement. Apart from some minor bugs, the sprites are always drawn on top of the surface, even though they might be behind a hill. I'm looking into z-buffers to see if I can fix that.

Anyway, I hope you enjoy it!

I got this error when trying to compile - I fixed it by including the <numeric> header.

twist5/src/IContainer.cpp: In member function double IContainer::getMaxRight():
twist5/src/IContainer.cpp:291:76: error: accumulate was not declared in this scope
    [] (double chain, IComponentPtr a) { return max(a->getRight(), chain); });
                                                                            ^

Can clearly see that this entry started off of something existing, it feels very complete with a lot of gameplay. And I love the graphics with all the detail, like the evil cats sitting in their tanks

Wow! The graphics on that mountain look great! I was just looking at a bunch of 3d isometric triangulated landscapes and wanted to start making something of my own like them. Did you use a shader to accomplish the lighting?

Great, you gotta love C++. Somehow I never get these kinds of problems with Java... Good that you managed to fix it in the end.

Nothing custom, just the standard allegro one. I calculate the light level per triangle by taking the cosine of the cross-product of the normal with a the light vector (parallel light source). Based on the light level I create a color with al_map_rgb, and set these in the ALLEGRO_VERTEX array along with the texture coordinates, followed by a

al_draw_prim(coord, NULL, tiles, 0, 6, ALLEGRO_PRIM_TRIANGLE_LIST);

The source code is all there if you want to have a look, in iso*.cpp and iso*.h

I've created new versions that fixes a few minor bugs

• Sound effects are no longer panned to one side

• Fixed drawing glitches at the edge of a map

I've also tried making a statically linked linux binary - please let me know if it works!

Linux binary
Windows binary

Too bad. I should add libjpeg.so.8 to the lib dir.

What OS are you using?

edit:
Would you be so kind to run ldd bin/dr_f and send me the output? I want to see if you're missing more libs.

For the record, here is a new
linux binary including libjpeg.

Bleh, of course. This time I accidentally included the debug binary instead of the release binary. I'll create a new version.

edit: here it is, could anybody please give it another test?

edit: I've added it to the depot as well. Is anybody seeing this? https://www.allegro.cc/cc/depot-project/DrEvilFXmasedition

Good point, I'll fix the al_init call.

I've thought about adding health power ups.

About the helicopter, I think the point is that it allows a different strategy, indeed that it allows you to rush ahead. But at the moment it's too easy to beat a level by rushing directly to the goal, and that is something that I should fix. What I don't know yet is how...