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Control Flow

2 (2.2%)

Arrays, Strings, Pointers, and References

8 (9%)

Functions

4 (4.5%)

Basic object-oriented programming

30 (33.7%)

A bit more advanced OOP (Composition, Operator overloading, Inheritance, Virtual Functions)

18 (20.2%)

Templates

8 (9%)

Other (Explain)

4 (4.5%)

Working with files?  (Streams)

15 (16.9%)

Total Members Voted: 89

[Siquo]

I read really good stuff about Bullet, but that was a while ago.

[Supermikhail]

Oh, yeah. Continuous collision detection. I almost died of dehydration drooling at it. But it's made for 3d and macro, takes rotation, and all the other stuff into account... So, there's another "stage" to my game, where it could be useful, if I live to code that stage... Oh. No, I mainly need graphics on 3d objects then, not physics. Fortunately, there seems to be quite a few Java 3d game engines these days...


Well, I'm retarded. Should have searched for game engines. Not physics engines. There's a flood of 2d game engines which include collision detection, graphics, and etc. Stubborn me, however, wants to have procedural graphics...

Edit: after a bit of searching I've stumbled on this video. That's what I want my game to look like... Or it would be more correct to say, feel like. I guess I can't do without a third-party library for that.

[Blank Expression]

There's nothing stopping you from using Bullet in a 2D manner. It is slightly more difficult but entirely doable. Just lock one axis.

[Derekristow]

Hey, I was planning on starting a new semi-serious game project in C#, and I was wondering which of Visual Studio's project templates would be the best choice, or if it even matters which one I choose.

[Blank Expression]

It doesn't, though you'll likely find it easiest to put most of your logic in a class library nd put the bare minimum of code necessary to stand the game up and interact with your engine core in a Windows or Console application. (The only practical difference between the two is the auto-use of [STAThread] on the Windows one, but you can do that on your own, and the toggling of the console window's display. You can set an application to Console for debug/testing and switch it over for a release without a problem, for example.

[ILikePie]

I was messing around with bitwise operators and stuff, and I decided to try and write a NAND adder and subtractor.
The adder works fine, but I'm having trouble getting two's complement when subtracting (I understand all I need to subtract a from b is add c and b, where c is two's complement for a). Here's what I've got. sub(6, 3) returns 13 for some reason.
Help?

e, rewrote sub(a,b) as "sub(a,b) { return add( add(a, NOT(b)), 1); }" (a + ~b + 1). Now sub(6,3) gives 3, and sub(3,6) gives 13.

[Virex]

Your current definition of sub is giving you -a + b, is that intended? Arg I failed to see your edit, ignore this.


Anyway, you're working in 4 bit, first one's the sign bit. That means that 13 is definitely overflow. 13 in 4-bit binary is 1101, which is equal to -8 + 5 = -3 in 2's complement. In other words, while you're working in 2's complement, you're reporting unsigned results, hence the weird result.

[ILikePie]

Yep, that was definitely it. Moved it up to 8 bits and it says that 0 - 1 = 255. Thanks.

[ILikePie]

Spoiler (click to show/hide)

I was working on a bitmap generator a while back, and I decided to mess around with it a bit yesterday, and noticed it wasn't working as expected. Giving it dimensions that aren't powers of 2 generate broken images.
Here's the code generating an 8x8 bitmap:

Code: [Select]

$ java -jar libDib.jar; hexdump -v tmp.dib
0000000 4d42 00f6 0000 0000 0000 0036 0000 0028
0000010 0000 0008 0000 0008 0000 0001 0018 0000
0000020 0000 00c0 0000 0200 0000 0200 0000 0000
0000030 0000 0000 0000 ffff ffff ffff ffff ffff
0000040 ffff ffff ffff ffff ffff ffff ffff ffff
0000050 ffff ffff ffff ffff ffff ffff ffff ffff
0000060 ffff ffff ffff ffff ffff ffff ffff ffff
0000070 ffff ffff ffff ffff ffff ffff ffff ffff
0000080 ffff ffff ffff ffff ffff ffff ffff ffff
0000090 ffff ffff ffff ffff ffff ffff ffff ffff
00000a0 ffff ffff ffff ffff ffff ffff ffff ffff
00000b0 ffff ffff ffff ffff ffff ffff ffff ffff
00000c0 ffff ffff ffff ffff ffff ffff ffff ffff
00000d0 ffff ffff ffff ffff ffff ffff ffff ffff
00000e0 ffff ffff ffff ffff ffff ffff ffff ffff
00000f0 ffff ffff ffff                         
00000f6
The f's represent the image data, what I call the canvas. I've got 192 sets of f's. 192/3 = 64 (For each color, red, green, and blue.), and 8*8 = 64. The image seems fine, and it also looks that way in an image viewer.

Here I do the same thing with a 7x7 image:

Code: [Select]

$ java -jar libDib.jar; hexdump -v tmp.dib
0000000 4d42 00c9 0000 0000 0000 0036 0000 0028
0000010 0000 0007 0000 0007 0000 0001 0018 0000
0000020 0000 0093 0000 0200 0000 0200 0000 0000
0000030 0000 0000 0000 ffff ffff ffff ffff ffff
0000040 ffff ffff ffff ffff ffff ffff ffff ffff
0000050 ffff ffff ffff ffff ffff ffff ffff ffff
0000060 ffff ffff ffff ffff ffff ffff ffff ffff
0000070 ffff ffff ffff ffff ffff ffff ffff ffff
0000080 ffff ffff ffff ffff ffff ffff ffff ffff
0000090 ffff ffff ffff ffff ffff ffff ffff ffff
00000a0 ffff ffff ffff ffff ffff ffff ffff ffff
00000b0 ffff ffff ffff ffff ffff ffff ffff ffff
00000c0 ffff ffff ffff ffff 00ff               
00000c9
Now the canvas has 147 bytes, (7*7*3 = 147, you can ignore that last blank bit, that's just some hexdump "feature."), the header is fine too, but for some reason the image is read weird, like so:

Scaled with GIMP. That black bar shouldn't be there.

Here's my source, am I writing the data wrong or something?

e, Never mind, it appears I need a color table as my bits per pixel are higher than 8. I was going to write this in at some point, so I guess I can start now.

[lordnincompoop]

Well, I keep getting the error LNK2005 (linking error from VS2010) but all my header guards are correct and I haven't repeated anything relevant as far as I can tell. What am I doing wrong?

Also, is there any library that can handle some basic guis maybe and inserting of pictures, but still allows easy text i/o?

[Siquo]

Is the order ok?
"A LNK2005 error occurs when the CRT library and MFC libraries are linked in the wrong order in Visual C++"

[alway]

Ah, good old LNK2005 error.

Are you #include'ing .cpp files by any chance?

[Siquo]

Is there an easy way of doing if(a < b < c){} in C++?
Right now I think it's doing a (a<b == true and true == 1) and ( 1 < c ).

I'm trying to ascertain whether all 8 corners of a cube have a "value x" that is above or below a threshold, and I want to take action as soon as one of them is "on the other side".


Right now I've got this:

Code: [Select]

   
//cur2 is the length of the side of the cube, goOn is a bool, false by default
    float a = -9999.f;
    float b = cutoff;
    if(sample(x, y, z) < cutoff){ a = cutoff; b = 9999.f; }

    if(!goOn && (a<sample(x+cur2, y, z)<b)){goOn = true;}
    if(!goOn && (a<sample(x, y, z+cur2)<b)){goOn = true;}
    if(!goOn && (a<sample(x+cur2, y, z+cur2)<b)){goOn = true;}
    if(!goOn && (a<sample(x, y+cur2, z)<b)){goOn = true;}
    if(!goOn && (a<sample(x+cur2, y+cur2, z)<b)){goOn = true;}
    if(!goOn && (a<sample(x+cur2, y+cur2, z+cur2)<b)){goOn = true;}
    if(!goOn && (a<sample(x, y+cur2, z+cur2)<b)){goOn = true;}
Any good ideas?

[Virex]

Tried (a<b && b<c) yet?

[lordnincompoop]

Ah, good old LNK2005 error.

Are you #include'ing .cpp files by any chance?

Nope.

Is the order ok?
"A LNK2005 error occurs when the CRT library and MFC libraries are linked in the wrong order in Visual C++"

I don't think I'm using either one.