D game engine -- Any suggestions?

[Rene Zwanenburg]

On Wednesday, 20 November 2013 at 09:15:41 UTC, Rene Zwanenburg 
wrote:
> Hi,
>
> A few things jumped out at me:
>
> Camera.d:
>
> ...
>
> Oops, I have to run.. Will take a look at the rest later.

Still regarding camera.d:

- The glfw3 import appears to be unused and can be removed.

- the call to Math.perspectiveGL modifies OpenGL state. Your math 
functions _really_ shouldn't interact with OpenGL.

- Taking the previous point a bit further, your Camera class 
doesn't need to know about OpenGL either. In your rendering 
routine, get the camera matrices from a camera and pass them to 
OpenGL.

- Like Paulo said, don't use the fixed function pipeline. If 
you're not familiar with 3D yet the FFP is easier to use at 
first, but using modern OpenGL will pay for itself in the long 
run. I don't know where to find a good introduction to modern 
OpenGL though, perhaps someone else around here..

- rotate, move are unnecessary. Once you switch to gl3n, move 
becomes:
camera.position += someVector;
Same thing with rotate, only you multiply:
camera.rotation *= someQuaternion;


math.d:

- D allows free functions. There's no need to use hacks like 
completely static classes. You can remove the Math class and put 
it's functions in the module.

- I'd also make std.math a public import, so you only have to 
import your math to get both in another module.

- perspectiveGL doesn't belong here, but this is fixed by using 
gl3n.


time.d

- Same thing with the statics as in math. Though personally I'd 
call Time Timer, and make instances. You'll probably want to have 
more than one timer.

- Sleeping doesn't belong in the timer. It should only calculate 
total running time and delta time in update. Later on you'll 
probably find out it needs more features, but these two will be 
fine for now. If anywhere, sleeping belongs in the game loop. 
That being said I'd advise against sleeping at all. It's usually 
better to use vsync, or run at max fps if the user disables it.


That's all I could find during a quick peek.. If you'd like me to 
clarify some of these points, please don't hesitate to ask!