Codehead's Corner
Random ramblings on hacking, coding, fighting with infrastructure and general tech
Posted: 17 Mar 2015 by Codehead
3 minute read
One of the big problems OpenGL runs into after you’ve got your first few polygons flying around the screen is the lack of a standard method for generating text within the API. A few techniques have evolved to tackle the problem: Pre-generated string textures The simplest and fastest method, a texture is pre-built for each piece of text that needs to be displayed. This is quick to render at run time, but isn’t very flexible or efficient.

Categories: Projects CBFG
Tagged as: #OpenGL #Font
Posted: 21 Jan 2009 by Codehead
1 minute read

Jazzhands Logo

TotemBall is a free XBox Live Arcade game, only downloadable by Xbox Live Vision camera owners.

The game requires the player to stand in front of the camera and wave their hands around to control the on-screen action. Anyone who has played the game for more than 2 minutes will know that your arms begin to ache very quickly, stopping you from playing the game for very long.

My solution is JazzHands, virtual hands for your computer. Simply point the LiveVision camera at the JazzHands window and control TotemBall using the cursor keys.

Categories: Projects
Tagged as: #C #OpenGL #XBox360
Posted: 11 Nov 2006 by Codehead
1 minute read

The work on AMBERs game logic and teams system has turned up a little nugget of eye candy - Team colours.

Example Team Colours

Using dynamically generated textures, I’ve been able to keep a single base texture for each model, but modify it at run time to apply a team colour and a joint colour.

Categories: AMBER
Tagged as: #OpenGL #DevBlog
Posted: 12 Oct 2006 by Codehead
2 minute read

I have written a few wrappers and objects for OpenGL during the development of AMBER. The first was a general OpenGL wrapper. This used the top left of the screen as the origin for orthographic projections, mainly because I was used to it being there and it avoided problems with mouse coordinates.

Next came the CBFG text class. This was intended to be dropped into other people’s code, so I used a bottom left origin as seems to be standard in OpenGL.

More recently I’ve incorporated my GUI class into the GL wrapper and bolted my text object onto it to provide textboxes, lists, etc…

This is where the problems began, the GL class and the GUI object use the top left as origin and the text class uses the bottom, so all the text in the controls was upside down.

I’ve rewritten the GL class and GUI class to use the bottom as the origin as this is the OpenGL way. However, it seems strange that every other system I’ve used treats the top of the screen as the Y axis origin. Why does GL have to be different? Is there any gain to be had by doing this? Or could I just fudge the projection matrix to use the top as the origin?

Ah well, it’s done now, I may re-visit this during optimisation, but that’s a long way off.

Categories: Projects AMBER CBFG
Tagged as: #OpenGL #Rant
Posted: 30 Sep 2006 by Codehead
1 minute read

Can’t seem to stay away from the coding contests.

GPWiki again, the topic was ‘Particles’. So I knocked up a little game called ‘Leaky Apps’.

Leaky Apps Screenshot

Categories: Coding Demo
Tagged as: #OpenGL
Posted: 21 Aug 2006 by Codehead
1 minute read

A small break for a family holiday and some work commitments. Also, I entered the coding contest last week with a pathfinding demo.

Pathfinder Screenshot

Categories: Demo AMBER Coding
Tagged as: #OpenGL #Pathfinding
Posted: 23 Jun 2006 by Codehead
2 minute read

Some progress on the in-game model handling….

Skeletal Animation!

The previous in-game model format was MD3. The format uses snapshots of the mesh for each frame, creating huge model files which require the vertex normals for each frame to be calculated at startup. The normal calculations alone took 30-45 seconds per model. The files were over 1Mb each and had a huge memory footprint. It also made the workflow for modelling a nightmare and very much a one way process.

Categories: Projects AMBER
Tagged as: #C++ #OpenGL #DevBlog
Posted: 6 Jun 2005 by Codehead
2 minute read

GLSandbox Logo

GLSandbox is a tool that I developed to help out on my OpenGL projects. I seem to spend a great deal of time tweaking blending parameters and fiddling with alpha testing to get things to look right.

Categories: Projects GLSandbox
Tagged as: #OpenGL
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