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Member Since 10 Jan 2011
Offline Last Active Apr 13 2014 01:34 PM

Topics I've Started

Best GUI for adjusting parameters in tech demo?

23 February 2014 - 06:28 PM

Hey guys,


A while back I remember seeing a tech demo that used this cool GUI library. It had a simple side panel where you could adjust parameters by clicking/dragging on the item and it would show a circular control that used the angle of the arc as a way to adjust the parameter. I don't remember what it was called, but it looked really simple and sleek. Would that ring a bell for anyone (sorry for being vague...)?


At any rate, I'm looking for a super simple GUI for writing some samples, ideally one that just has a basic side panel with widgets. Do you guys have any suggestions?



Shared stencil buffer between framebuffers?

17 March 2013 - 07:53 PM

I'm writing a game where I need to apply a gaussian blur to parts of the scene. I've created an FBO with a depth-stencil buffer attached, and I'm rendering my scene to that buffer. I would like to set the stencil buffer to 1 for any fragment that requires blur, so my rendering queue has logic to set/unset that based on the requirements of the renderable. There are only a few sprites that are being blurred.


I'm trying to wrap my head around how OpenGL handles frame buffers with attached render buffers and all that. Is there a way I can share the stencil buffer across a couple frame buffer objects as well as my back buffer? Ideally, I would like to render everything into one scratch FBO (while doing stencil writes), and then render a first gaussian pass into the second FBO ignoring fragments not flagged by the stencil buffer. Finally, I'd like to render the second pass into the main framebuffer (also with stencil testing enabled).


Is this possible? I'm not quite understanding how OpenGL interprets which stencil buffer to use. I assume anytime I'm calling glStencilFunc, it's acting on the currently bound framebuffer object. In that case, do I need to somehow grab the default stencil buffer and attach it to my scratch FBOs?



Academic Licensing

13 August 2012 - 05:12 PM

So as an undergraduate student, I thought of an interesting legal issue. Most of the software that I currently use for development is academically licensed. I have an MSDN academic version of Windows and Visual C++. I've been messing around with the academic version of Maya, etc.

I'm currently working on a game that is just a personal hobby project, nothing for profit. Just today I was reading through some of the licensing info for Maya, and it sounds like anything you've ever made with their education software is ineligible to sell. As a hobbyist developer, I have aspirations to make stuff that's good enough to sell, but it sounds like I have to invest in commercial versions of stuff BEFORE I even start working on a project in order for me to be able to eventually sell it.

Moving over to the for-profit domain is scary...

Unexpected behavior with ALT-TAB in Fullscreen Mode (DXGI)

22 July 2012 - 01:17 PM

I am setting my DirectX11 application to run in fullscreen mode when I create the swap chain. This works fine until I ALT-TAB to minimize. All it does is undo the fullscreen mode and place the window in the background (i.e. not minimized, just a background window). Maximizing the window or refocusing the window doesn't cause it to switch back to fullscreen mode. Does DXGI expect me to do something that I'm not? I've read the MSDN documentation online and it doesn't explain how to handle this case.


Simulating tank treads...without the treads

01 July 2012 - 05:40 PM

I'm playing around with Bullet Physics, but I think my question is probably physics engine agnostic. Basically, I'm looking to simulate an arcade/style tank. I want to use a constraint based system rather than a raycast system to make it a bit more physically based. I've basically set up a constraint that limits the rotation to one degree of freedom (the axis angle), and one translational degree of freedom with a spring (the shock absorber). I don't want to actually simulate the treads, but I'd like for the wheels to behave as if they have treads, i.e. a force applied to one wheel affects all wheels. More than that, some of the wheels are bigger than others, so I have to take in to account their size differences.

I guess what I'm asking is, do I need to do some heavy gear differential related math to apply forces to each wheel, or does bullet (or any other engine) have constraints designed to accommodate this kind of scenario?